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All Journal Chemistry Indonesian Journal of Chemical Research Jurnal Teknik Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences
Tatang Hernas Soerawidjaja
Program Studi Teknik Kimia, FTI, ITB, Jl. Ganesha No.10, Bandung
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Pengambilan Kembali Vanadium Pentaoksida dari Katalis Bekas Soerawidjaja, Tatang Hernas; Victoria, Agnes Veronica; ., Reynard; Aliwarga, Lienda
Jurnal Teknik: Media Pengembangan Ilmu dan Aplikasi Teknik Vol 17 No 2 (2018): Jurnal Teknik - Media Pengembangan Ilmu dan Aplikasi Teknik
Publisher : Fakultas Teknik - Universitas Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.046 KB) | DOI: 10.26874/jt.vol17no2.87

Abstract

Katalis vanadium bekas diperkirakan akan menjadi salah satu sumber utama persediaan vanadium di masa mendatang. Hasil analisis vanadium dalam katalis vanadium bekas menunjukkan bahwa kadar V2O5 nyamasih cukup banyak untuk diambil dan diolah kembali. Dalam penelitian ini, suatu prosedur telah dikembangkan untuk mengesktraksi vanadium dari katalis vanadium bekas berdasarkan prosedur yang dikembangkan oleh peneliti terdahulu. Katalis vanadium bekas uji coba prosedur menunjukkan bahwa metode gabungan ekstraksi vanadium dari katalis vanadium bekas menggunakan pelarut basa Na2CO3 dan H2O2 pada umpan (tahap ekstraksi pertama) dan NaOH (tahap ekstraksi kedua) yang diikuti dengan netralisasi filtrat dengan asam H2SO4  merupakan prosedur terbaik. Lebih lanjut, terdapat tiga variabel yang sangat berpengaruh dalam pengambilan kembali vanadium dari katalis vanadium bekas, yang ditandai dengan nilai probability of being active di atas 50%. Ketiga variabel tersebut adalah temperatur pengadukan pada tahap ekstraksi II, penambahan larutan H2O2 di umpan dan waktu pengadukan pada tahap ekstraksi I dengan nilai probability of being active secara berturut-turut sebesar 100%, 86%, dan 56%. Untuk mendapatkan perolehan vanadium yang lebih tinggi perlu diadakan penelitian lanjutan yang mengoptimumkan  variabel-variabel tersebut.
Karakterisasi Fotokatalis Untuk Fotoreduksi Karbon Dioksida Menjadi Asam Format Dalam Fasa Akuatik Rizkiana, Jenny; Devianto, Hary; Soerawidjaja, Tatang Hernas
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-jen

Abstract

Photoreduction of carbon dioxide is one of the promising method to reduce green house gas emission. Carbon dioxide can be converted into organic chemical that has higher economic value by utilizing light energy. One of the favorable product is formic acid which is can be used as hydrogen-carrier. For this process, photocatalyst plays important role as it can increase the rate of reaction and as well as the selectivity as such more desirable product can be produced. The objective of present study is to develop photocatalyst which can significantly catalyze the photoreduction process of CO2 to form formic acid. Zinc titanate doped with aluminium is used as the base photocatalyst. Photoreduction process is held in room condition using three 2800 lm lamp. Qualitative analysis of the product is done by silver solid test and acidity test while quantitative analysis is done by High Performance Liquid Chromatography (HPLC) test. The silver solid test results confirm that formic acid is formed during process. Based on acidity profile data, anthocyanin as photosensitizer could increase higher acidity in the mixture than melanin. However, the concentration of formic acid in the solution is still very low so that it cannot be detected by HPLC.
Exploration of Novel Lipase from Plant Seeds and Plant Latexes Istyami, Astri Nur; Sari, Myra Wardati; Gultom, Cristy Hagi; Prakoso, Tirto; Soerawidjaja, Tatang Hernas
Indonesian Journal of Chemical Research Vol 12 No 1 (2024): Edition for May 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-ist

Abstract

As the demand for fatty acids increases, the enzymatic process of triglyceride hydrolysis emerges as a promising technology. Compared to microbial lipase, utilization of plant lipase is more practical due to its ease of preparation and cost-efficiency. This work aimed to verify the degree of lipolysis of several novel lipase sources from plants. Novel lipase sources investigated were seeds of kapok (Ceiba pentandra), java almond (Sterculia foetida), pongam (Milletia pinnata), sea mango (Cerbera manghas), tamanu (Calophyllum inophyllum), latex of sea mango, aveloz (Euphorbia tirucalli), and jackfruit (Artocarpus heterophyllus). Several acknowledged plant lipase sources were also compared, i.e. seeds of castor bean (Ricinus communis), physic nut (Jatropha curcas), rice bran (Oryza sativa), latex of frangipani (Plumeria rubra) and papaya (Carica papaya). Plant lipase was utilized in the hydrolysis of olive oil at room temperature. Results for seed and latex lipase were compared and technical issues were reported. Several plant lipases are remarkably active and potential to compete with microorganism lipases in industrial applications.
Photoreduction of CO2 to Formic Acid in Aquatic Phase Using Layer Double Hydroxide (LDH) Catalyst Rizkiana, Jenny; Auliardi, Dzaky; Az Zahra, Aghietyas Choirun; Thadeo, Francesco; Saputera, Wibawa Hendra; Soerawidjaja, Tatang Hernas; Devianto, Hary
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 4 Year 2024 (December 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20199

Abstract

The increasing accumulation of CO2, the primary greenhouse gas (GHG), in the Earth's atmosphere has caused significant environmental problems and adverse climate change. Photoreduction offers promising method to convert CO2 into high value chemical compounds, such as formic acid, which can serve as a hydrogen carrier. The process of photoreduction efficiency can be enhanced by using photocatalyst capable of operating across two distinct photosystems each having a different spectrum based on the sensitivity of light. This study aims to investigate the impact of the photocatalyst preparation conditions on the activity of the resulting photocatalyst and identify which is the most effective one on the formic acid production. Photocatalysts based on Layered Double Hydroxide (LDH) composed of zinc and chromium was synthesized, resulting in Zn-Cr LDH, which was subsequently enhanced by incorporating Cu and Cu₂O. The operating temperature varied at 60 ℃ and 100 ℃. The highest yield of formic acid of 21,62 μmol.gcat-1.hr-1 was obtained at a reaction temperature of 100 ℃ using 0.3Cu@Zn-Cr LDH. This photocatalyst shows increased activity when the reaction temperature is increased to 60 ℃ and 100 ℃. In contrast, 0.3Cu2O@Zn-CrLDH showed a decreased activity at the elevated temperatures. This discrepancy attributed to the self-oxidation mechanism of Cu and Cu2O; while the oxidation of 0.3Cu@Zn-CrLDH results in Cu2O which retains photocatalytic activity, the oxidation of 0.3Cu2O@Zn-CrLDH leads to inactive CuO. This study provides valuable insight into the material design and demonstrates the potential of Cu-modified Zn-Cr LDH for sustainable CO2 reduction applications. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Exploration of Biomimetic Metal-Organic Catalysts for Splitting Glucose into Dihydroxyacetone and Glyceraldehyde Sumargo, Margaretha; Audreylia, Vanessa; Luivan, Samuel; Susanti, Maria Patrycia Della; Soerawidjaja, Tatang Hernas; Hudaya, Tedi
Journal of Engineering and Technological Sciences Vol. 57 No. 2 (2025): Vol. 57 No. 2 (2025): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.2.1

Abstract

Lactic acid is a metabolite produced during glucose glycolysis, typically generated industrially through the fermentation of glucose using microorganisms. However, the high production cost of this fermentation process makes lactic acid relatively expensive, rendering biodegradable plastics made from polylactic acid less competitive. This research focuses on the initial stages of glucose glycolysis process, in which glucose is split into dihydroxyacetone and glyceraldehyde, both of which are isomers of lactic acid. Biomimetic metal-organic catalysts composed of Mg-Zn tripolyphosphate, imidazole, and monosodium or monoammonium glutamate were tested in a water–acetonitrile reaction medium. Prior to catalyst testing, either water–acetonitrile or water–acetonitrile–acetone solutions were chosen as the reaction medium based on their effectiveness in producing phase separation. The study investigated the effects of catalyst concentrations, catalyst types, and reaction temperatures on glucose conversion, as well as the yield and selectivity of dihydroxyacetone and glyceraldehyde within 6 hours reaction time at pH 8. The results showed that these biomimetic metal-organic catalysts effectively facilitated the splitting of glucose in a water–acetonitrile solution, achieving the best glucose conversion of 57.16% at a temperature of 90°C with a catalyst concentration of 0.8%-mol.
Co-Authors ., Reynard Aghietyas Choirun Az Zahra Audreylia, Vanessa Auliardi, Dzaky Devianto, Hary Gultom, Cristy Hagi Istyami, Astri Nur Lienda Aliwarga Luivan, Samuel Rizkiana, Jenny Saputera, Wibawa Hendra Sari, Myra Wardati Sumargo, Margaretha Susanti, Maria Patrycia Della Tedi Hudaya Thadeo, Francesco Tirto Prakoso Victoria, Agnes Veronica