Eksergi最新文献

{"title":"The concentration effect of sembukan leaf (Paederia foetida L) extract as ferrous metal corrosión inhibitor to HCl 1M solution and sea wáter","authors":"Elis Novitaningrum, Mohammad Arfi Setiawan, Ade Trisnawati","doi":"10.31315/e.v20i3.10163","DOIUrl":"https://doi.org/10.31315/e.v20i3.10163","url":null,"abstract":"The massive development of industry creates human using various of metal which available in the nature for being contruction, for example a Iron metal. The iron is a transition metal on periodic table which often used on industry and building construction, however iron is a corrodiable metal. The metal corrotion must be solved cause create many of loss. Therefore, the study aimed to examine sembukan leaf extract in various consentration, 0%, 2%, 4%, 6%, 8% to seawater and HCl 1M during 7 days of contact moment. The correlation strenght between variable using regression linier method. Based on study that the higher consentration inhibitor and the corrotion rate decreases. He highest efficiency using seawater is 89,9% and using HCl 1 is 68,9%. The highest correlation between variable is 93,2% using seawater. Th e conclution is sembukan leaf extract effective to protect iron corrotion of seawater. Keywords: sea wáter, extraction, HCl, corrotion inhibitor, oxidation","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455841","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":"Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu","authors":"Bambang Soeswanto, Yusmardhani Yusuf, Rony Pasonang Sihombing, Joko Suryadi, Angely Luviana, Restu Adji Alif Asyari, Alfiana Adhitasari","doi":"10.31315/e.v20i3.10353","DOIUrl":"https://doi.org/10.31315/e.v20i3.10353","url":null,"abstract":"Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455846","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":"Decreasing Of Oxalate Content in Porang Based on Different Sample Shape, Soaking Time, Temperature, and Soaking Solutions","authors":"Bambang Sugiarto, RR Endang Sulistyowati, Cicilia Tri Marantika Dewi, Rahadian Yogi Hendranto","doi":"10.31315/e.v20i3.9269","DOIUrl":"https://doi.org/10.31315/e.v20i3.9269","url":null,"abstract":"Porang, known for its high oxalate content that poses digestive challenges, served as the underlying problem in this study. The research investigated the impact of immersion conditions on oxalate reduction in porang, both in the form of longitudinal slices and diced pieces, using various soaking media, including vinegar, alcohol, and water, with temperature variations. The study identified that the optimal immersion time for achieving maximum oxalate reduction in longitudinal slices was 150 minutes at 50°C in water, resulting in a 0.00495% decrease. In the case of diced porang, the most significant reduction occurred after 120 minutes at 70°C in alcohol, leading to a 0.0045% decrease. These findings shed light on the influence of porang shape and soaking conditions on oxalate release, with diced porang demonstrating faster oxalate reduction, likely due to its smaller surface area. The study offers valuable insights into effectively reducing oxalate levels in porang, contributing to safer consumption.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455838","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":"Penentuan Konstanta Isoterm Freundlich dan Kinetika Adsorpsi Karbon Aktif Terhadap Asam Asetat","authors":"Dwi Setyorini, Andi Arninda, Achmad Qodim Syafaatullah, Renova Panjaitan","doi":"10.31315/e.v20i3.10835","DOIUrl":"https://doi.org/10.31315/e.v20i3.10835","url":null,"abstract":"Karbon aktif merupakan salah satu adsorben yang paling sering digunakan. Salah satu senyawa yang dapat diserap yaitu asam asetat. Untuk mengetahui kinerja adsoben lebih lanjut, maka diperlukan studi kinetika berdasarkan persamaan isotherm Freundlich. Isoterm Freundlich mampu menunjukkan jenis adsopsi apakah secara kimisorpsi atau fisisorpsi dan berlangsung secara multilayer. Studi kinetika pseudo first orde dan pseudo second orde dimaksudkan untuk mengetahui mekanisme dan karakteristik adsorpsi yang berlangsung. Penelitian ini bertujuan untuk mengetahui konstanta isotherm Freundlich dan kinetika adsorpsi karbon aktif terhadap asam asetat. Konsentrasi asam asetat yang digunakan untuk mengetahui konstanta freundlich yaitu 0,5M, 0,25M, 0,125M, 0,0625M, 0,03125M dengan lama waktu kontak selama 10 menit. Sedangkan kinetika adsorpsi dilakukan dengan menggunakan asam asetat yang berkonsentrasi 0,5 M dengan waktu adsorpsi 2 menit, 4 menit, 6 menit, 8 menit dan 10 menit. Kemudian filtrat di titrasi dengan NaOH 0,1N. Ukuran karbon aktif yang digunakan antara lain 180 mess, 420 mess dan 600 mess. Data yang diperoleh dianalisis dengan persamaan freundlich, pseudo first orde dan pseudo second orde . Data analisis yang didapatkan nilai konstanta freundlich yaitu sebesar 50,00342 dan memenuhi kinetika orde dua yang artinya, proses adsorpsi dipengaruhi lebih dari satu faktor.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135454820","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":"Investigasi dan Karakterisasi Pirolisis Ban Truk Fuso Canter FE71","authors":"Danang Jaya, Tunjung Wahyu Widayati, Muhammad Agung Izzulhaq, Fevi Mirawati","doi":"10.31315/e.v20i3.9637","DOIUrl":"https://doi.org/10.31315/e.v20i3.9637","url":null,"abstract":"Pengembangan dan keberlanjutan bidang energi di seluruh dunia merupakan hal yang sangat penting saat ini. Limbah yang berasal dari produk berbasis minyak bumi memiliki potensi yang cukup besar untuk menghasilkan energi. Limbah ban merupakan limbah yang susah membusuk, sehingga membutuhkan tempat yang luas untuk menyimpannya dan jika dibakar akan menimbulkan masalah baru. Salah satu upaya yang dapat dilakukan yaitu mengkonversi limbah ban bekas menjadi bentuk lain, yaitu tar dan arang sebagai energi alternative melalui proses pirolisis. Dalam studi ini, fokus kami adalah mengetahui pengaruh variasi suhu pirolisis, komposisi pada tar, dan nilai kalor pada arang dan tar hasil pirolisis ban truk Fuso Canter FE71. Suhu pirolisis yang digunakan yaitu 500, 600, 700, 800 °C selama 3 jam. Rendemen arang dan tar meningkat hingga titik optimum pada suhu 600 °C, kemudian menurun hingga suhu 800 °C. Komposisi tar dianalisis menggunakan Gas Chromatography-Mass Spectrometry yang menghasilkan 45,38% limonene ; 19,82% benzene ; 4,81% toluene ; 10,91% xylene ; dan 14,48% alkene . Nilai kalor tar dan arang diuji menggunakan alat Bomb Calorimeter . Tar dengan metode ASTM D040-19 menghasilkan nilai kalor 7.413,870 kal/g dan arang dengan metode ASTM D-2015-66 menghasilkan nilai kalor 7.878,918 kal/g.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135454819","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":"Produksi Asam Laktat Melalui Jalur Biologi dan Jalur Kimia Katalitik Menggunakan Berbagai Bahan Baku","authors":"Apsari Puspita Aini, Enny Nurmalasari, Carolus Borromeus Rasrendra, Johnner Sitompul","doi":"10.31315/e.v20i3.9768","DOIUrl":"https://doi.org/10.31315/e.v20i3.9768","url":null,"abstract":"Aplikasi asam laktat pada berbagai industri menarik minat para peneliti untuk memproduksi asam laktat melalui berbagai jalur reaksi. Perolehan isomer asam lakat yang lebih murni dibandingkan dengan jalur reaksi kimia katalitik menjadikan jalur biologi dengan fermentasi menjadi jalur reaksi yang banyak dipakai di industri. Berbagai mikroorganisme pada golongan Lactic Acid Bacteria telah digunakan untuk memproduksi asam laktat baik dalam skala laboratorium maupun skala industri. Berbagai bahan baku dapat dikonversi menjadi asam laktat seperti, dihidroksi aseton, gliseraldehid, piruvaldehid, xilosa, glukosa, fruktosa, sukrosa, selulosa, insulin, selobiosa, pati, levoglukosan dan lignoselulosa. Kemampuan katalis dalam metode kimiawi menarik banyak minat peneliti untuk mencari alternatif pembuatan asam laktat yang bisa mengkonversi gula menjadi asam laktat dengan waktu reaksi yang lebih singkat. Penggunaan berbagai katalis mulai dari katalis homogen dan heterogen terbukti dapat menghasilkan asam laktat dengan yield yang bervariasi. Katalis lanthanum triflate terlihat menghasilkan asam laktat dengan perolehan yang baik walaupun dari bahan baku lignoselulosa yang perlu perlakuan awal terlebih dahulu karena mempunyai senyawa lignin yang bisa menghalangi kerja katalis. Kata Kunci : asam laktat; kimia katalitik; fermentasi; lignoselulosa ABSTRACT : The utilization of lactic acid for various applications encourages researchers to produce lactic acid by various reaction pathways. The yield of lactic acid isomer which is purer than the catalytic chemical reaction makes the biological pathway by fermentation widely used in industry. Various microorganisms in the Lactic Acid Bacteria categories have been used to produce lactic acid both on a laboratory and industrial scale. Various raw materials can be converted into lactic acid such as dihydroxy acetone, glyceraldehyde, pyruvaldehyde, xylose, glucose, fructose, sucrose, cellulose, insulin, cellobiose, starch, levoglucosan and lignocellulose. The ability of catalyst has attracted interest of researcher to find alternatives for making lactic acid that can convert sugar into lactic acid with a shorter reaction time. The use of various catalysts from homogeneous and heterogeneous catalysts has been proven to produce lactic acid with varying results. The lanthanum triflate catalyst proven to produce lactic acid with a high yield, even though it is from lignocellulosic raw materials that need pre-treatment to remove lignin compounds which can inhibit the performance of the catalyst. Keywords: lactic acid; chemical catalytic; fermentation; lignocellulose","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455840","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":"Sintesis Bioetanol dari Rumput Laut Coklat (Sargassum sp) Asal Pulau Timor Sebagai Energi Terbarukan","authors":"Patrisius Maryanto Bria, Sefrinus Maria Dolfi Kolo","doi":"10.31315/e.v20i3.9857","DOIUrl":"https://doi.org/10.31315/e.v20i3.9857","url":null,"abstract":"Pasokan bahan bakar minyak (BBM) saat ini masih bergantung pada bahan bakar fosil yang mengakibatkan menipisnya cadangan minyak di perut bumi. Konsumsi energi di sektor transportasi saat ini sebesar 44,2%. Hal ini mengakibatkan meningkatan emisi gas karbon dioksida yang berdampak pada penipisan ozon. Bioetanol merupakan salah satu bahan bakar terbarukan yang dapat menggantikan bahan bakar fosil. Penelitian ini bertujuan untuk mendapatkan kadar gula dan kadar bioetanol yang tinggi. Sargassum sp dinilai ideal untuk dikonversi menjadi bioetanol karena memiliki kandungan karbohidrat 53,28% dan selulosa 23,97-35,22%. Kandungan karbohidrat yang tinggi ini dapat diubah menjadi bioetanol melalui beberapa metode yaitu preparasi, hidrolisis, fermentasi dan distilasi. Preparasi sampel dilakukan dengan tujuan mengurangi ukuran dan memperluas permukaan sampel menggunakan saringan 35 mesh . Hidrolisis dilakukan pada suhu 150 0 C selama 50 menit menggunakan katalis H 2 SO 4 2% dengan bantuan microwave . pH yang digunakan dalam proses fermentasi adalah 4,5 dan mikroorganisme yang digunakan yaitu Saccharomyces cerevisiae . Hidrolisat gula dianalisis dengan metode DNS menggunakan spektrofotometer UV-Vis. Uji kualitatif etanol dilakukan secara kimiawi menggunakan kalium dikromat dan uji kuantitatif etanol menggunakan hand refraktometer . Hasil analisis menunjukkan bahwa kadar gula pereduksi adalah 6296,67 ppm. Hasil uji kualitatif etanol dikonfirmasi dari perubahan warna dari orange menjadi hijau kebiruan. Hasil analisis etanol kuantitatif menggunakan refraktometer tangan sebesar 34%.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135455847","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":"Degradasi Limbah Detergen dengan Metode Fotokatalis Menggunakan TiO2 / Silica Gel","authors":"Shinta Amelia, Siti Jamilatun, Lukhi Mulia Shitopyta, Maryudi Maryudi, Mila Utami W, Ida Sriyana","doi":"10.31315/e.v20i3.9214","DOIUrl":"https://doi.org/10.31315/e.v20i3.9214","url":null,"abstract":"Limbah detergen dihasilkan dari laundry dan limbah rumah tangga yang menyebabkan pencemaran air yang merusak organisme dalam perairan. Detergen terdiri atas tiga komponen utama, yaitu surfaktan, builders dan aditif. Surfaktan jenis Alkyl Benzene Sulfonat (ABS) dan Linear Alkylbenzene Sulfonate (LAS) merupakan senyawa aktif detergen. Tujuan dari penelitian ini untuk mempelajari proses degradasi fotokatalis dalam menurunkan konsentrasi LAS dan ABS dengan variabel bebas konsentrasi bahan aktif detergen dan waktu penyinaran. Pengolahan limbah detergen yang digunakan pada penelitian ini adalah metode fotokatalis TiO 2 dengan penyangga silica gel. Variasi konsentrasi LAS dan ABS yaitu 50 ppm dan 100 ppm menggunakan katalis silica gel /SiTiO 2 sebanyak 0,05gram dengan variasi waktu penyinaran sinar UV sampai 24 jam. Persentase degradasi yang dihasilkan dalam waktu 24 jam dengan katalis silica gel -TiO 2 pada ABS 50 ppm yaitu 96,08% dan ABS 100 ppm yaitu 99,00%. Sedangkan Persentase degradasi yang dihasilkan dalam waktu 24 jam dengan katalis silica gel -TiO 2 pada LAS 50 ppm yaitu, 96,61% dan LAS 100 ppm yaitu 99,61%. Penggunaan katalis silica gel - TiO 2 dalam LAS lebih efektif dan mempunyai sifat yang lebih baik dibandingkan ABS karena LAS mudah terurai sehingga semakin lama penyinaran warna larutan menjadi pudar dan proses degradasi fotokatalis menjadi lebih mudah.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135977022","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":"Distribusi Ukuran Granul dari Tepung Singkong dengan Tepung Tapioka sebagai Pengikat pada Rotary Drum Granulator","authors":"D. Handayani, W. B. Sediawan, Daniel Timotius, Mitha Puspitasari","doi":"10.31315/e.v20i2.9170","DOIUrl":"https://doi.org/10.31315/e.v20i2.9170","url":null,"abstract":"Granulation is a process of monoparticle attachment with a particular mechanism to form a bigger and compact particle which is called granule. Granulation application has been used on many industries like pharmacy and agriculture industries. Research about granulation has been done continuously to get predictive models for various cases. The model which is only applicable to the specific material used in this research is expected to be useful to optimize the perfomances of the granulator in the industries. This research aims to develop the kinetics model of granule size distribution of cassava flour and its connection to granulation time by varying the mass of tapioca starch as the binder in rotary drum granulator. 2 grams of Cassava flour and tapioca starch were mixed in the rotary drum granulator and then water was sprayed during the granulation process. The duration of granulation were 5, 10, 15, 20, and 25 minutes. The variations of mass of the binder used in this research were 1, 1,5, and 2 gram. The granules were dried in the oven at 80°C until 30 minutes, and afterwards the granules were screened through various screen layers with different mesh size. The results of this research show that binder mass variations do not influence the layering rate of granule, and the increase of binder mass will decrease the birth rate.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47094564","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":"Current Research on The Development of Carbon Separation and Capture with Polymeric Membrane: A State of The Art Review","authors":"R. D. Nyamiati, S. Nurkhamidah, Dodi Eko Nanda, D. Timotius, Mahreni Mahreni, Dian Purnami Handayani, D. Amalia, A. Krisnabudhi","doi":"10.31315/e.v20i2.9096","DOIUrl":"https://doi.org/10.31315/e.v20i2.9096","url":null,"abstract":"Separation and capture of carbon dioxide (CO2) has become a very hot topic of discussion recently. The increasing amount of carbon dioxide in the environment makes environmental pollution very significant. Membrane technology is one of the alternative carbon separation processes that are increasingly in demand, because membrane technology provides excellent advantages in terms of energy requirements used, capital investment invested, and ease of operating equipment compared to other processes. Many membrane constituent materials can be used to be the basic material for making membranes, including polymeric materials. This review discusses the various polymeric materials that can be used as basic materials for gas membranes in terms of plasticization, constituent components, flexibility, and mechanical strength. It also provides an understanding of alternatives to improve the properties of polymer-based membranes.","PeriodicalId":30703,"journal":{"name":"Eksergi","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43075261","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}