Jurnal Kimia dan Rekayasa最新文献

{"title":"Potensial Fatty Oil Pollution from Restaurant Wastewater","authors":"Virgian Nur Kharismasari Faradillah, P. Pujiastuti","doi":"10.31001/jkireka.v3i1.40","DOIUrl":"https://doi.org/10.31001/jkireka.v3i1.40","url":null,"abstract":"Wastewater from community activities such as restaurants, with the characteristic number of parameters exceeding the quality standard of wastewater, which is not treated but is directly discharged into the receiving water body, will have the potential to cause environmental pollution. The source of waste generation comes from the use of soap in washing cutlery which will result in an increase in the pH of the wastewater, and the cooking process causes the presence of fatty oil waste. This study aims to determine the potential for water pollution from pH and fatty oil parameters in restaurant wastewater from three different categories in Karanganyar Regency. Laboratory descriptive research method. The test samples were taken in a time-composite manner at the outlets of fast food restaurants, traditional and coffee shops which were selected with the best-selling criteria. Determination of the potential for causing pollution is seen from the number of parameters compared to the quality standard of domestic wastewater according to Central Java Regional Regulation number 5 of 2012. The pH value is determined based on SNI 6989.11:2019, while the fat oil number is determined by the gravimetric method according to SNI 6989.10:2011. The results of the study showed that the pH value of the wastewater test samples from fast food restaurants was 7.5 – 7.82, traditional restaurants were 8.11 – 8.44, and coffee shops were 7.97-8.16. Fat oil figures show differences in the three test samples, fast food restaurant wastewater 92.67 mg/l, traditional restaurant 1,143 mg/l, and coffee 54.33 mg/l. Restaurant wastewater has a great potential to pollute the water environment on the fat oil parameters.\u0000Abstrak Air limbah dari kegiatan masyarakat seperti rumah makan, dengan karakteristik angka parameter melebihi baku mutu air limbah, yang tidak dilakukan proses pengolahan namun langsung dibuang ke badan air penerima, akan memiliki potensi menimbulkan pencemaran lingkungan. Sumber timbulan limbah berasal dari penggunaan sabun dalam pencucian alat makan akan mengakibatkan naiknya pH pada air limbah, dan proses memasak menyebabkan adanya limbah minyak lemak. Penelitian ini bertujuan untuk menentukan potensi pencemaran air dari parameter pH dan minyak lemak pada air limbah rumah makan dari tiga kategori yang berbeda di Kabupaten Karanganyar. Metode penelitian diskriptif laboratoris. Contoh uji diambil secara komposit waktu pada outlet rumah makan cepat saji, tradisional dan coffee shop yang dipilih dengan kriteria terlaris. Penentuan potensi menimbulkan pencemaran dilihat dari angka parameter yang dibandingkan dengan baku mutu air limbah domestik sesuai Perda Jateng nomor 5 tahun 2012. Angka pH ditentukan berdasarkan SNI 6989.11:2019, sedangkan angka minyak lemak ditentukan dengan metode gravimetri sesuai SNI 6989.10:2011. Hasil penelitian nilai  pH contoh uji air limbah rumah makan cepat saji sebesar 7,5 – 7,82, rumah makan tradisional 8,11 – 8,44 sebesar, dan coffee shop ","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122576870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Peroxide Numbers and Free Fatty Acids in Unbranded Bulk Cooking Oil in Traditional Markets","authors":"Greiszya Priskila, P. Darmawan","doi":"10.31001/jkireka.v3i1.41","DOIUrl":"https://doi.org/10.31001/jkireka.v3i1.41","url":null,"abstract":"Unbranded bulk cooking oil is widely sold in traditional markets at low prices. Cooking oil sold in the market must meet the quality set by the government, where cooking oil that does not meet the requirements will have an impact on health. The parameters used to determine the quality of cooking oil include the content of free fatty acids and peroxide numbers. The purpose of this study is to determine the levels of free fatty acids and peroxide numbers in unbranded bulk cooking oil and to determine whether the unbranded bulk cooking oil meets the requirements of SNI 7702: 2012. Determination of free fatty acids is done by the alkalimetry method using ethanol 95% neutral and PP indicator 1% then titrated with a standard NaOH solution to a pink color. The determination of the peroxide number was carried out by the iodometric method with the addition of glacial acetic acid: isooktan and saturated KI which was then titrated with a standard solution of sodium thiosulfate with the addition of 1% amylum indicator until the blue color disappeared. The results showed that all unbranded bulk cooking oil samples sold in the traditional market in Jebres Subdistrict, Surakarta had met the requirements for free fatty acid parameters, while for peroxide numbers only contained 1 sample that met the requirements of the seven samples, namely samples from the E market. \u0000AbstrakMinyak goreng curah tidak bermerek banyak dijual dipasar tradisional dengan harga yang murah. Minyak goreng yang dijual dipasaran harus memenuhi mutu yang ditetapkan oleh pemerintah, dimana minyak goreng yang tidak memenuhi persyaratan akan berdampak bagi kesehatan. Parameter yang digunakan untuk menentukan kualitas minyak goreng antara lain adalah kandungan asam lemak bebas dan bilangan peroksida. Tujuan penelitian ini adalah mengetahui kadar asam lemak bebas dan bilangan peroksida dalam minyak goreng curah tidak bermerek dan untuk mengetahui apakah minyak goreng curah tidak bermerek tersebut sudah memenuhi persyaratan SNI 7702:2012. Penentuan asam lemak bebas dilakukan dengan metode alkalimetri menggunakan etanol 95% netral dan indikator PP 1 % kemudian di titrasi dengan larutan standar NaOH sampai warna merah muda. Penetapan bilangan peroksida dilakukan dengan metode iodometri dengan penambahan asam asetat glasial : isooktan dan KI jenuh yang kemudian dititrasi dengan larutan standar natrium tiosulfat dengan penambahan indikator amylum 1% sampai warna biru hilang. Hasil penelitian menunjukan semua sampel minyak goreng curah tidak bermerek yang dijual di pasar tradisional Kecamatan Jebres, Surakarta telah memenuhi syarat untuk parameter asam lemak bebas, sedangkan untuk bilangan peroksida hanya terdapat 1 sampel yang memenuhi syarat dari ke tujuh sampel, yaitu sampel dari pasar E.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127623471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of Optimum Flow Rate in Textile Industry Wastewater Color Removal Using Electrooxidation Method With Continuous System","authors":"Suseno, P. Darmawan, Argoto Mahayana","doi":"10.31001/jkireka.v3i1.42","DOIUrl":"https://doi.org/10.31001/jkireka.v3i1.42","url":null,"abstract":"An experiment to remove the color of textile wastewater by electrooxidation method using graphite electrodes with a continuous system has been carried out. The electrooxidation apparatus consists of an electrooxidation vessel with a size (p x l x h) = (60 x 30 x 18) cm equipped with 5 pairs of graphite electrodes, a flow rate meter and an adapter (DC power). The experiment was started by flowing wastewater into an electrooxidation device at a flow rate of 0.3 liters per minute (LPM). After that DC power is turned on and set at 3 volts. Waste water that has undergone oxidation is taken from the outlet of the electrooxidation device after a processing time of 20 minutes from the time the DC power is turned on. This experiment was repeated with varying voltages of 6, 9, 12 and 15 volts and at a flow rate of 0.5; 1.0; 1.5 and 2.0 LPM. The experimental results show that at each value the minimum absorbance voltage is obtained at a water rate of 0.5 LPM, this indicates that the optimum wastewater flow rate for decolorizing textile wastewater by electrooxidation method using graphite electrodes with a continuous system is 0.5 LPM. \u0000AbstrakTelah dilakukan percobaan penghilangan warna air limbah tekstil dengan metode elektrooksidasi menggunakan elektroda grafit dengan sistim kontinyu. Alat elektrooksidasi terdiri dari bejana elektrooksidasi  dengan ukuran (p x l x t ) = 60  x 30  x 18 )  cm yang dilengkapi dengan 5 pasang elektroda grafit, alat pengukur laju alir dan adaptor          ( DC power ). Percobaan dimulai dengan mengalirkan air limbah ke dalam alat elektrooksidasi dengan laju alir 0,3 liter per menit (LPM). Setelah itu DC power dihidupkan dan diatur pada tegangan 3 volt. Air limbah yang telah mengalami oksidasi diambil dari outlet alat elektrooksidasi setelah waktu proses 20 menit terhitung dari saat DC power dihidupkan. Percobaan ini diulangi dengan tegangan bervariasi yaitu 6, 9, 12 dan 15 volt dan pada laju alir 0,5; 1,0; 1,5 dan 2 LPM. Hasil percobaan menunjukkan bahwa pada setiap harga tegangan absorbansi minimum didapat pada laju air 0,5 LPM, hal ini menunjukkan bahwa laju alir air limbah optimum pada penghilangan warna air limbah tekstil dengan metode elektrooksidasi menggunakan elektroda grafit dengan sistim kontinyu adalah 0,5 LPM.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129240266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parameter Analysis of Nitrite, Nitrate, Ammonia, Phosphate in Agricultural Wastewater., Genuk Harjo, Wuryantoro, Wonogiri","authors":"Syahriyati Mutiah, Sumardiyono, P. Pujiastuti","doi":"10.31001/jkireka.v3i1.43","DOIUrl":"https://doi.org/10.31001/jkireka.v3i1.43","url":null,"abstract":"The water quality of the Wuryantoro watershed decreased due to the entry of environmental pollutant burden in the form of land use and various human activities such as settlements, agriculture and industry. The land use of the Wuryantoro watershed was dominated by agricultural land. This study aimed to analyze the quality of agricultural wastewater based on the parameters of Nitrate, Nitrite, Ammonia, Phosphate and calculate the agricultural pollution load originating from the residence time of fertilization. Grabs sampling was carried out at 3 points of agricultural land outlets representing the entire population before entering the Wuryantoro river. The research was conducted in April - June 2015 by analyzing parameters of Nitrate, Nitrite, Ammonia and Phosphate used referring to SNI and APHA using a UV-Vis Spectrophotometer. The end point showed that the level and load of NO3 and NH3 parameters were still below the quality standard according to PP 82 of 2001 concerning Water Quality Management and Water Pollution Control, while the NO¬2 parameter for 2 days and 6 days of fertilization time exceeded the quality standard. The PO4 parameter was above the required threshold based on the Class II criteria according to PP 82 of 2001. \u0000AbstrakKualitas perairan DAS Wuryantoro semakin menurun akibat masuknya sumber beban pencemar lingkungan berupa pemanfaatan lahan dan berbagai aktivitas manusia seperti permukiman, pertanian dan industri. Penggunaan lahan DAS Wuryantoro didominasi oleh lahan pertanian. Penelitian ini bertujuan untuk menganalisis kualitas air limbah pertanian berdasarkan parameter Nitrat, Nitrit, Amonia, Fosfat dan menghitung beban pencemaran pertanian yang berasal dari waktu tinggal pemupukan. Teknik sampling secara grabs sampling dilakukan pada 3 titik outlet lahan pertanian yang mewakili dari keseluruhan populasi sebelum masuk ke sungai Wuryantoro. Penelitian dilakukan pada bulan April - Juni tahun 2015 metode analisis parameter Nitrat, Nitrit, Amonia dan Fosfat yang digunakan mengacu pada SNI dan APHA dengan menggunakan alat Spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa kadar dan beban pencemaran parameter NO3 dan NH3 masih berada di bawah baku mutu menurut PP 82 Tahun 2001 tentang Pengelolaan Kualitas Air dan Pengendalian Pencemaran Air, sedangkan parameter NO­2 untuk waktu tinggal pemupukan 2 hari dan 6 hari melebihi baku mutu. Pada parameter PO4 sudah di atas ambang batas yang dipersyaratkan berdasarkan kriteria Kelas II menurut PP 82 tahun 2001.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117236821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Total Suspended Solid (TSS) and Ammonia (NH3-N) Levels in Textile Liquid Waste","authors":"Sih Jayaning Ratri, Argoto Mahayana","doi":"10.31001/jkireka.v3i1.39","DOIUrl":"https://doi.org/10.31001/jkireka.v3i1.39","url":null,"abstract":"Textile liquid waste is waste from textile operations that contains high organic and inorganic elements. Organic and inorganic elements may pollute the environment if dumped straight into water. The breakdown of organic and inorganic elements in water by microorganisms produces a very poisonous chemical called Ammonia (NH3), which causes high TSS levels owing to the buildup of organic and inorganic materials. TSS levels in textile wastewater A were determined using the gravimetric technique, which involves weighing the suspended precipitate after it has been filtered using a vacuum pump and dried in an analytical oven. To determine Ammonia levels, the sample’s Ammonia would react with Hypochlorite from Sodium Hypochlorite and Phenol reagent solutions, then be catalyzed by Sodium Nitroprusside to produce indophenol blue compounds, which were detected by UV-Vis spectrophotometer at 640 nm. TSS was 10,84 mg/l and Ammonia was 0,34 mg/l in textile wastewater sample A. This result satisfies the textile wastewater quality criteria set out in the Republic of Indonesia Minister of Environment and Forestry Regulation No. P. 16/ MENLHK/ SETJEN/ KUM. 1/ 4/ 2019 TSS limit of 50 mg/l and Ammonia maximum of 8,0 mg/l. \u0000Abstrak Limbah cair tekstil adalah limbah cair yang berasal dari beberapa proses di industri tekstil yang mengandung bahan organik dan anorganik yang tinggi. Adanya bahan organik dan anorganik ini dapat menyebabkan pencemaran terhadap lingkungan jika dibuang langsung ke perairan. Di perairan bahan organik dan anorganik akan mengalami proses dekomposisi oleh mikroba sehingga menghasilkan produk yang sangat toksik yaitu Amonia (NH3) serta menyebabkan kadar TSS di perairan menjadi tinggi akibat terakumulasinya bahan organik dan anorganik. Penentuan kadar TSS pada limbah cair tekstil A dilakukan dengan metode gravimetri yaitu dengan cara menimbang endapan tersuspensi yang sudah disaring dengan pompa vakum dan dikeringkan dengan oven analitik sampai diperoleh bobot konstan. Penentuan kadar Amonia dilakukan dengan metode spektrofotometri secara fenat yaitu Amonia yang berasal dari sampel akan bereaksi dengan Hipoklorit yang berasal dari larutan pereaksi Natrium Hipoklorit dan Fenol kemudian dikatalisis oleh Natrium Nitroprusida membentuk senyawa biru indofenol yang dideteksi dengan spektrofotometer UV-Vis pada panjang gelombang 640 nm. Hasil penelitian menunjukkan bahwa sampel limbah cair tekstil A memiliki kadar TSS sebesar 10,84 mg/l dan Amonia sebesar 0,34 mg/l. Hasil ini memenuhi syarat baku mutu air limbah tekstil menurut Peraturan Menteri Lingkungan Hidup dan Kehutanan Republik Indonesia No. P.16/MENLHK/ SETJEN/ KUM. 1/ 4/ 2019 Tentang Baku Mutu Air Limbah yaitu maksimal 50 mg/l untuk TSS dan maksimal 8,0 mg/l untuk Amonia.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121444455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review : Equation Study of Langmuir and Freundlich Isotherms on Adsorption of Heavy Metal Fe (II) with Zeolite and Activated Carbon from Biomass","authors":"Noviana Sariana Sarana Miri, Narimo","doi":"10.31001/jkireka.v2i2.36","DOIUrl":"https://doi.org/10.31001/jkireka.v2i2.36","url":null,"abstract":"Zeolite and activated carbon can be used as adsorbent of metal ion Fe(II). The activation of zeolite and activated carbon was carried out with various acid and alkaline solutions. The purpose of this literature review is to determine the equation of the Langmuir isotherm and the Freundlich isotherm on the absorption of an adsorbate, namely metal ion Fe (II) by natural and synthetic zeolites and activated carbon made from biomass sourced from the relevant literature. Determination of the appropriate adsorption isotherm pattern is done by entering the research data into the empirical formula of the Langmuir and Freundlich equations. The equation in Langmuir is 1/q = 1/qm.b . 1/Ce + 1/qm, where to determine the Langmuir isotherm equation it is necessary to find the values of 1/qm.b and 1/qm. The equation in Freundlich is 1/q = 1/qm.b . 1/Ce + 1/qm, where to determine the Freundlich isotherm equation it is necessary to find the value of log k and 1/n. The sought price can be obtained by graphing by plotting 1/q versus 1/Ce for Langmuir and log x/m versus log Ce for Freundlich. The largest maximum capacity of the Langmuir isotherm is 10.19 mg/g using a zeolite (synthetic) adsorbent. And the largest maximum capacity on the Freundlich isotherm is 182.9 mg/g using activated carbon as adsorbent (button mangrove stem biomass). \u0000AbstrakZeolit dan karbon aktif dapat dimanfaatkan sebagai adsorben ion logam Fe (II). Pengaktivasian zeolit dan karbon aktif dilakukan dengan berbagai larusan asam dan larutan basa. Tujuan dalam literature review ini adalah untuk mengetahui persamaan isoterm Langmuir dan isoterm Freundlich pada penyerapan suatu adsorbat yaitu ion logam Fe (II) oleh zeolit alam maupun sintetis dan karbon aktif yang terbuat dari biomassa yang bersumber pada literature yang relevan. Penentuan pola isoterm adsorpsi yang sesuai dilakukan dengan cara memasukkan data hasil penelitian ke dalam rumus empiris persamaan Langmuir dan Freundlich. Persamaan pada Langmuir yaitu 1/q = 1/qm.b . 1/Ce + 1/qm, dimana untuk menentukan persamaan isoterm Langmuir perlu dicari harga 1/qm.b dan 1/qm. Persamaan pada Freundlich yaitu 1/q = 1/qm.b . 1/Ce + 1/qm, dimana untuk menentukan persamaan isoterm Freundlich perlu dicari harga log k dan 1/n. Harga yang dicari dapat didapatkan dengan cara membuat grafik dengan mengeplotkan 1/q versus 1/Ce untuk Langmuir dan log x/m versus log Ce untuk Freundlich. Kapasitas maksimum terbesar pada isoterm Langmuir yaitu 10,19 mg/g dengan menggunakan adsorben zeolit (sintesis). Dan Kapasitas maksimum terbesar pada isoterm Freundlich yaitu 182,9 mg/g dengan menggunakan adsorben karbon aktif (biomassa batang bakau kancing).","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"438 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116329386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cellullosa Acetate Production From Mollases","authors":"Teguh Gustiansyah, Dewi Astuti Herawati","doi":"10.31001/jkireka.v2i2.35","DOIUrl":"https://doi.org/10.31001/jkireka.v2i2.35","url":null,"abstract":"Previous research stated that cellulose acetate is made from wood containing cellulose. This research utilizes molasses as a producer of cellulose from nata de molasses. Nata de molasses is then acetylated to produce cellulose acetate. The aim of the study was to determine the effect of molasses content on acetyl content and degree of substitution of cellulose acetate. The manufacture of cellulose acetate goes through 3 stages, namely making nata de molasses, pollinating nata de molasses, and making cellulose acetate. Making Nata de molasses using molasses as much as 1000 ml with molasses levels: 0.5%, 1%, and 1.5%. Nata de molasses is dried and then blended to a size of 40 mesh and produces nata de molasses powder. Nata de molasses powder was hydrolyzed using glacial acetic acid, then anhydrous acetic acid and sulfuric acid were added as catalysts for the acetylation process. After the acetylation process is complete, the cellulose acetate powder is purified and then dried. In this study, the nata de molasses produced had -cellulose content of 85.46% - 88.75%. The results showed that cellulose acetate from 1.5% molasses had the characteristics of cellulose acetate as a plastic making material with an acetyl content of 29.55854% and a substitution degree of 1.56561. \u0000Abstrak \u0000Penelitian terdahulu menyatakan bahwa Selulosa asetat dibuat dari bahan kayu mengandung selulosa Penelitian ini memanfaatkan molase sebagai penghasil selulosa dari nata de molase. Nata de molase kemudian diasetilasi menghasilkan selulosa asetat. Tujuan penelitian adalah mengetahui pengaruh kadar molase terhadap kadar asetil dan derajat substitusi selulosa asetat. Pembuatan selulosa asetat melalui 3 tahap yaitu pembuatan nata de molase, pembuatan serbuk nata de molase, dan pembuatan selulosa asetat. Pembuatan Nata de molase menggunakan molase sebanyak 1000 ml dengan kadar molase: 0,5%, 1%, dan 1,5%. Nata de molase dikeringkan kemudian diblender hingga ukuran 40 mesh dan menghasilkan serbuk nata de molase. Serbuk nata de molase dihidrolisis menggunakan asam asetat glasial, kemudian ditambahkan asam asetat anhidrat dan asam sulfat sebagai katalis untuk proses asetilasi. Setelah proses asetilasi selesai serbuk selulosa asetat dimurnikan lalu dikeringkan. Pada penelitian ini nata de molase yang dihasilkan memiliki kadar -selulosa sebesar 85,46% - 88,75%. Hasil penelitian menunjukkan selulosa asetat dari molase 1,5 % mempunyai karakteristik selulosa asetat sebagai bahan pembuatan plastik dengan kadar asetil 29,55854% dan derajat subtitusi sebesar 1,56561","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133457651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Antimicrobial Silver Nanoparticle Varnish using Moringa Leaf Bioreductor (Moringa Olifiera)","authors":"Hamid Abdillah, Muhammad Baharits, Rijal Abidin, Firdaus Rizki Biantoro","doi":"10.31001/jkireka.v2i2.38","DOIUrl":"https://doi.org/10.31001/jkireka.v2i2.38","url":null,"abstract":"Silver nanoparticles have stable properties and potential applications especially as anti-microbial agents. The growth of fungi and bacteria on the wood surface can be inhibited by varnishing with silver nanoparticles. The nano-silver particles were prepared by synthesizing silver nitrate at concentration of 1, 3, and 5 mM with Moringa oleifera as a bioreductant. PVA (Polyvinyl Alcohol) as a stabilizer was varied at the levels of 0.5%, 1%, and 2%. In the UV-Vis test, the wave peaks are in the range 395-515 nm, this is in accordance with the characteristics of silver nanoparticles. The addition of 1% PVA to silver nanoparticles provided the best stability among the four concentrations provided by evidence of low maximum wavelength shift after storing. Particle size examination using the Particle Size Analyzer (PSA) showed silver nanoparticles had a size of 75.6 nm. Then the silver nanoparticle solution was applied to the resin varnish. The solution of silver nanoparticles has an effect on the antimicrobial properties of resin varnish, as evidenced by the absence of mold growth in the media with silver nanoparticles added.\u0000Abstrak Nanopartikel perak memiliki sifat yang stabil dan aplikasi yang potensial khususnya sebagai agen anti-mikroba. Pertumbuhan jamur dan bakteri pada permukaan kayu dapat dihambat dengan pernis yang diberi bahan nanopartikel perak. Partikel nano-perak dibuat melalui sintesis perak nitrat konsentrasi 1, 3, dan 5 mM dengan bioreduktor daun kelor (Moringa oleifera). PVA (Polivinil Alkohol) sebagai stabilsator divariasikan pada kadar 0,5, 1, dan 2%. Pada pengujian UV-Vis, puncak gelombang berada pada rentang 395-515 nm yang sesuai dengan karakteristik nanopartikel perak.  Penambahan PVA 1% pada nanopartikel perak memberikan kestabilan paling baik diantara keempat konsentrasi karena pergeseran panjang gelombang maksimal yang rendah. Pemeriksaan ukuran partikel menggunakan Partikel Size Analyzer ( PSA ) menunjukkan nanopartikel perak memiliki ukuran 75,6 nm. Selanjutnya larutan nanopartikel perak tersebut diaplikasikan pada pernis damar.  Larutan nanopartikel perak berpengaruh terhadap sifat anti mikroba pada pernis damar, dibuktikan dengan tidak tumbuhnya jamur pada media yang ditambahkan nanopartikel perak.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122288748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Tofu Industrial Liquid Waste Disposal on Well Water Quality","authors":"Nadia Shafa Khairuna, Salsadilla Yasmin Andika Putri, Uniya Azarina, T. Widayatno","doi":"10.31001/jkireka.v2i2.37","DOIUrl":"https://doi.org/10.31001/jkireka.v2i2.37","url":null,"abstract":"The liquid waste of the tofu industry around residential area will affect the quality of their well water. This study was aimed to determine the effect of  the tofu industry wastewater on wells located around the tofu industry at different distances. This study took 3 well water samples from 3 well sources with a distance of 10 meters from the tofu industry, 20 meters from the tofu industry, and 30 meters from the tofu industry. The well water samples were examined at the Health Laboratory of Sukoharjo Regency to determine the physicochemical properties such as odor, taste, color, temperature, turbidity, and amount of dissolved solids, such as iron, manganese, chloride, hardness as CaCO3, pH, and sulfate, as well as biological contamination such as coliform and feces. From the results of this study, it was found that the quality of well water around the tofu industry located in Madegondo Grogol Sukoharjo Village is only suitable for bathing and washing but is not suitable for consumption in accordance with the quality standards of clean water quality in accordance with the Regulation of the Minister of Health of the Republic of Indonesia Number 32 2017. \u0000AbstrakLimbah cair industri tahu yang ada disekitar rumah warga akan mempengaruhi kualitas air sumur warga sekitar. Penelitian ini bertujuan untuk mengetahui pengaruh dari limbah cair industri tahu terhadap sumur yang terletak di sekitar industri tahu tersebut dengan jarak yang berbeda-beda. Penelitian ini mengambil sampel air sumur sejumlah 3 dari 3 sumber sumur dengan jarak 10 meter dari industri tahu, 20 meter dari industri tahu, dan 30 meter dari industri tahu. Sampel air sumur tersebut kami uji di Laboratorium Kesehatan Kabupaten Sukoharjo untuk mengetahui kelayakan fisik seperti bau, rasa, warna, suhu, kekeruhan, dan jumlah zat padat terlarut, kelayakan kimiawi seperti besi, mangan, khlorida, kesadahan sebagai CaCO3, pH, dan sulfat, dan kelayakan bakteriologi seperti coliform dan colitinja. Dari hasil penelitian tersebut didapatkan hasil bahwa kualitas air sumur di sekitar industri tahu yang terletak di Desa Madegondo Grogol Sukoharjo hanya layak digunakan untuk mandi dan mencuci namun tidak layak untuk dikonsumsi sesuai dengan standar baku mutu kualitas air bersih sesuai dengan Peraturan Menteri Kesehatan Republik Indonesia Nomor 32 Tahun 2017.","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132860712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination Of Adsorption Constant Of Metal Nickel In Electroplating Waste With Continue Adsorption Method Using Activated Water Hyacinth","authors":"Emi Erawati, Rossi Al Ahmad","doi":"10.31001/jkireka.v2i2.34","DOIUrl":"https://doi.org/10.31001/jkireka.v2i2.34","url":null,"abstract":"","PeriodicalId":107274,"journal":{"name":"Jurnal Kimia dan Rekayasa","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122031926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}