KOVALEN: Jurnal Riset Kimia最新文献_第9页

Pengaruh Asam Itakonat terhadap Properti Polimer Perekat Akrilik Berbasis Air Itakonat酸对水基丙烯酸粘合剂特性的影响

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.15507

R. Sihombing, Agustinus Ngatin

{"title":"Pengaruh Asam Itakonat terhadap Properti Polimer Perekat Akrilik Berbasis Air","authors":"R. Sihombing, Agustinus Ngatin","doi":"10.22487/kovalen.2021.v7.i2.15507","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i2.15507","url":null,"abstract":"Acrylic-based polymer adhesive is a type of adhesive that can be used for pressure sensitive adhesive (PSA). Itaconic acid (IA) is a type of acid with 2 (two) OH groups which can form hydrogen bonds. The acrylic base can be used purely from its class. In some cases, however, the acrylic base can be used together with another base. Therefore acrylic-based adhesive with variable addition of itaconic acid was introduced in this study. In this application, the holding power property is one of the important parameters of a PSA. Therefore, holding power is the main parameter in this study. This research includes the preparation of tools and materials, mixing the main raw materials of acrylic monomer and itaconic acid with the types of surfactants and water, and product characterization. The polymerization process is carried out at a pressure of 1 atm with a temperature of 75°C - 80°C accompanied by stirring with a rotation rate of ± 500 rpm. The characterization of this research resulted in a PSA product with a holding power of 2 kg for 30 seconds to 620 minutes. While the resulting peel strength is 1.12 kgf / inc to 0.76 kgf / inc. \u0000Keywords: itaconic acid, acrylic PSA, holding power","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"40 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82841253","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}

引用次数: 0

Adsorbsi Ion Logam Cu (II) Menggunakan Biomassa Daun Genjer (Limnocharis flava)

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.14009

Helni Febriani, D. Puspitasari, Ruslan, Husain Sosidi

引用次数: 1

Elektroplating Grafena-Polianilina pada Stainless Steel sebagai Elektroda pada Elektrolisis Air untuk Produksi Hidrogen

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.15538

Rahmiani Gani, Syarifah Rabiatul Adawiah, Arfiani Nur

{"title":"Elektroplating Grafena-Polianilina pada Stainless Steel sebagai Elektroda pada Elektrolisis Air untuk Produksi Hidrogen","authors":"Rahmiani Gani, Syarifah Rabiatul Adawiah, Arfiani Nur","doi":"10.22487/kovalen.2021.v7.i2.15538","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i2.15538","url":null,"abstract":"Hydrogen production by water electrolysis can be optimalized by improve the working electrode. Stainless steel as working electrode was coated with graphene and polyaniline by using cyclic voltammetry method with Ag/AgCl as reference electrode and Pt as counter electrode. Coated electrodes were characterized by SEM-EDS and cyclic voltammetry method. Furthermore, the synthesized electrode was applied for water electrolysis by adding 1- 5 g/L NaHCO3. The characterization data showed that Stainless steel/Graphene-Polyaniline electrode can be synthesized by using cyclic voltammetry. The coating process was conducted at sweeping rate 10 mV/s on voltage -0.2 to 0.8 V for 10 cycles. The voltammograms showed that the highest cathodic peak current of electrolysis obtained at 0.491 mA by addition 2 g NaHCO3 on SS/G-PANi0,5 electrode, and the highest anodic peak current obtained at 0.191 mA by addition 2 g NaHCO3 on SS/G-PANi0,5 electrode. Based on the overpotential data, the smallest average potential difference of H+ adsorption obtained by SS/G-PANi1,0 electrode, and the smallest average potential difference of H+ desorption obtained by SS/G-PANi0,5 electrode. \u0000Keywords: Stainless steel, hydrogen production, electroplating, electrocatalyst, electrolysis","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77022174","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}

引用次数: 0

Ekstraksi dan Uji Stabilitas Zat Warna Alami dari Biji Buah Pinang (Areca catechu L.) sebagai Bahan Pengganti Pewarna Sintetik pada Produk Minuman 从槟榔籽(Areca catechu L)中提取和测试天然染料的稳定性，作为饮料产品合成染料的替代品

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.15541

St. Chadijah, Sari Ningsih, Ummi Zahra, Syarifah Rabiatul Adawiah, Iin Novianty

{"title":"Ekstraksi dan Uji Stabilitas Zat Warna Alami dari Biji Buah Pinang (Areca catechu L.) sebagai Bahan Pengganti Pewarna Sintetik pada Produk Minuman","authors":"St. Chadijah, Sari Ningsih, Ummi Zahra, Syarifah Rabiatul Adawiah, Iin Novianty","doi":"10.22487/kovalen.2021.v7.i2.15541","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i2.15541","url":null,"abstract":"Natural dyes are an alternative dye that is not toxic, environmentally, friendly and easily degraded. Therefore, optimizing the use of body coloring sources is carried out. One of the natural dyes released is tannin from betel nuts. Tannins are polar pigments. This study aims to determine the results of natural dyes in betel nuts and find out the durability produced and known organoleptic results. Dyestuff extraction from betel nuts was carried out with 96% ethanol. Testing the color stability of betel nut seedlings was carried out on the effect of pH, temperature and storage time with the method UV-Vis Spectrophotometer. Then the application of betel nut dyes on beverage products was carried out. The results showed that betel fruit produced tannin dyes in brownish red color with an average tannin content of 28.002 mg/L. Dyes stabilized at pH of 6 by heating at 400C and storage for 2 days. The results of organoleptic tests showed that the extract of areca nut powder can be used as a natural dye in beverage products with a level of color, smell and flavor that emits at a concentration of 0.005 g/mL of dyes. \u0000Keywords: Extraction, tannin, areca nuts, color stability, organoleptic","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91297542","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}

引用次数: 1

Studi dan Aplikasi Elektroda FeTiO3-TiO2/Ti untuk Degradasi Reactive Blue 160 dengan Metode Fotoelektrokatalisis 研究与应用于光合作用作用的蓝色反应性160电极和应用

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.15561

Thamrin Azis, Maulidiyah Maulidiyah, Muhammad Nurdin, Muhammad Zakir Muzakkar, Ratna, L. A. Kadir, Viesta Valentin Octavian, T. Nurwahida, C. Bijang, Haris W

{"title":"Studi dan Aplikasi Elektroda FeTiO3-TiO2/Ti untuk Degradasi Reactive Blue 160 dengan Metode Fotoelektrokatalisis","authors":"Thamrin Azis, Maulidiyah Maulidiyah, Muhammad Nurdin, Muhammad Zakir Muzakkar, Ratna, L. A. Kadir, Viesta Valentin Octavian, T. Nurwahida, C. Bijang, Haris W","doi":"10.22487/kovalen.2021.v7.i2.15561","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i2.15561","url":null,"abstract":"The manufacture of titanium dioxide (TiO2) electrodes is made by anodizing method and coated with ilmenite (FeTiO3) through a dip-coating technique. The ilmenite (FeTiO3) coated TiO2/Ti plate electrode was developed for the degradation of the reactive blue 160 dye under photoelectrocatalytic UV and Visible light irradiation. The performance of FeTiO3-TiO2 / Ti composites degrades reactive blue 160 under UV irradiation and is visible photoelectrocatalytically compared to TiO2. The results of XRD characterization of TiO2 crystals in the form of anatase at 2θ, namely 35.1 ° (110), and the substitution of Fe dopant on TiO2 in the form of anatase and rutile crystals. FTIR data indicated the presence of Fe-O bonds at wave numbers <700 nm. SEM-EDX results showed a thin layer of FeTiO3 was formed, indicating that the dip-coating method was effective in the coating process. The performance of the FeTiO3-TiO2 / Ti electrode has the highest activity against the oxidation process under visible light than the TiO2/Ti electrode. The results of degradation of reactive blue 160 dye with a concentration of 0.5 ppm by photoelectrocatalytic showed that the TiO2 / Ti and FeTiO3-TiO2/Ti electrodes were active in visible irradiation with degradation rate constants of 48% and 69%. \u0000Keywords: Electrodes, ilmenite, TiO2 / Ti, degradation, reactive blue 160, photoelectrocatalysis","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"76 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89226507","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}

引用次数: 0

Kualitas Minyak Ikan Lele Dumbo (Clarias gariepinus) Selama Penyimpanan dengan Penambahan Likopen Kasar dari Buah Tomat 鲶鱼Dumbo油的质量储存与粗番茄番茄红素的加入

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.13905

H. Pua, Nurhaeni, Erwin Abdul Rahim, Prismawiryanti

引用次数: 0

Pemanfaatan Lumpur Minyak dengan Solar sebagai Energi Alternatif Bahan Bakar 利用柴油作为替代能源的石油泥浆

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.15509

Y. Sarungu, R. Sihombing

引用次数: 0

Pemanfaatan Selulosa dari Rumput Gajah (Pennisetum purpureum) pada Sintesis Karboksimetil Selulosa (CMC)

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-09-01 DOI: 10.22487/kovalen.2021.v7.i2.14227

Erwin Abdul Rahim, Grace Sita Turumi, Syaiful ' Bahri, Jusman, Syamsuddin

引用次数: 1

Potential Combination of Kapok Leaf Extract (Ceiba pentandra G.) and Turmeric Extract (Curcuma domestica Va) as an Anticancer Compound 木棉叶提取物(Ceiba pentandra G.)和姜黄提取物(Curcuma domestica Va)作为抗癌化合物的潜在组合

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-01-01 DOI: 10.22487/kovalen.2021.v7.i1.15493

M. Natsir, S. N. Safitri, Oktovia Nurmawati, Muh. Saleh Purnama R., Ruslan

{"title":"Potential Combination of Kapok Leaf Extract (Ceiba pentandra G.) and Turmeric Extract (Curcuma domestica Va) as an Anticancer Compound","authors":"M. Natsir, S. N. Safitri, Oktovia Nurmawati, Muh. Saleh Purnama R., Ruslan","doi":"10.22487/kovalen.2021.v7.i1.15493","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i1.15493","url":null,"abstract":"Combination of kapok leaf extract (Ceiba pertandra G.) and turmeric extract (Curcuma domestica Va.) was carried out to determine the potential of extracts in treating cancer with BSLT and murine cells P388. Cancer is a disease that is very feared because it’s difficult to cure, and even rarely causes death. The sample was extracted with methanol, the extract was mixed so that the mixture extract from the two samples was obtained. The results showed that in the BSLT test the mixed extract had a bioactivity against shrimp larvae with an LC50 value of 142.946 ppm. While in Leukemia P388 cell testing showed that the combination of mixed extracts had a cytotoxic effect on Leukemia P388 cancer cells with inhibitory concentration values of 54.34 ppm. This shows that the kapok leaf extract (Ceiba pentandra G.) and combination of turmeric extract (Curcuma domestica Va.) has potential and can be developed as an anticancer agent because it has an IC50 value that can inhibit murine P388 cell growth and LC50 value which can kill shrimp larvae Artemia salina L.","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83681970","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}

引用次数: 0

Penentuan Aktivitas Antioksidan dan Kandungan Flavonoid Total Ekstrak Daun Papasan (Coccinia grandis L.) Berdasarkan Perbedaan Pelarut Polar 测定抗氧化物活性和总胚芽根提取物的含量。基于极地溶剂的不同

KOVALEN: Jurnal Riset Kimia Pub Date : 2021-01-01 DOI: 10.22487/kovalen.2021.v7.i1.15437

M. Sari, Rani Nareza Ulfa, Mauritz Pandapotan Marpaung, Purnama

{"title":"Penentuan Aktivitas Antioksidan dan Kandungan Flavonoid Total Ekstrak Daun Papasan (Coccinia grandis L.) Berdasarkan Perbedaan Pelarut Polar","authors":"M. Sari, Rani Nareza Ulfa, Mauritz Pandapotan Marpaung, Purnama","doi":"10.22487/kovalen.2021.v7.i1.15437","DOIUrl":"https://doi.org/10.22487/kovalen.2021.v7.i1.15437","url":null,"abstract":"Papasan leaves have several properties, including antihyperglycemic, diabetes, antipyretic and antioxidant. Minor metabolite compounds that have the potential as antioxidants from this plant are flavonoids, alkaloids, saponins, and tannins. This study's purpose to determine the antioxidant activity and the flavonoid total contents of Papasan (Coccinia grandis L.) leaf extract based on the differences in polar solvents. The polar solvents used were ethanol, methanol, and water. Extraction used by maceration and dekokta. The antioxidant activity and the flavonoid total contents were established by UV-Vis spectrophotometry according to the decrease in absorbance at a maximum wavelength of 515 nm by the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. Determination of antioxidant activity and the flavonoid total contents were excluded on quercetin comparisons. The values of IC50 and the flavonoid total contents in the ethanol extract respectively were 287.92 ppm and 49.825 mg QE/g while the IC50 values and total flavonoid levels in the extract of methanol were 73.29 ppm and 50.415 mg QE/g. In the extract of the water, the value of IC50 was 39.80 ppm and the total flavonoid contents were 50.415 mg QE/g. The conclusions of these studies were that the most antioxidant activity was found in water extract, while water and methanol extract had the same and highest levels of total flavonoids.","PeriodicalId":17905,"journal":{"name":"KOVALEN: Jurnal Riset Kimia","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79608224","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}

引用次数: 3