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All Journal VALENSI SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Dasar ENGINEERING Bulletin of Chemical Reaction Engineering & Catalysis Elkawnie Indonesian Journal of Chemistry Jurnal Kelautan Nasional ASEAN Journal of Chemical Engineering Greensphere: Journal of Environmental Chemistry Jurnal Rekayasa Kimia & Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis
Adi Darmawan
Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics

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Journal : Indonesian Journal of Chemistry

 1 
Bismuth Oxide Prepared by Sol-Gel Method: Variation of Physicochemical Characteristics and Photocatalytic Activity Due to Difference in Calcination Temperature Yayuk Astuti; Brigita Maria Listyani; Linda Suyati; Adi Darmawan
Indonesian Journal of Chemistry Vol 21, No 1 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.53144

Abstract

Research on synthesis of bismuth oxide (Bi2O3) using sol-gel method with varying calcination temperatures at 500, 600, and 700 °C has been done. This study aims to determine the effect of calcination temperature on the characteristics of the obtained products which encompasses crystal structure, surface morphology, band-gap energy, and photocatalytic activity for the decolorization of methyl orange dyes through its kinetic study. Bismuth oxide prepared by sol-gel method was undertaken by dissolving Bi(NO3)3·5H2O and citric acid in HNO3. The mixture was stirred then heated at 100 °C. The gel formed was dried in the oven and then calcined at 500, 600, and 700 °C for 5 h. The obtained products were a pale yellow powder, indicating the formation of bismuth oxide. This is confirmed by the existence of Bi–O and Bi–O–Bi functional groups through FTIR analysis. All three products possess the same mixed crystal structures of α-Bi2O3 (monoclinic) and γ-Bi2O3 (body center cubic), but their morphologies and band gap values are different. The higher the calcination temperature, the larger the particle size and the smaller the band gap value. The accumulative differences in characteristics appoint SG700 to have the highest photocatalytic activity compared to SG600 and SG500 as indicated by its percent degradation value and decolorization rate constant.
Hydrocracking of Coconut Oil on the NiO/Silica-Rich Zeolite Synthesized Using a Quaternary Ammonium Surfactant Sriatun Sriatun; Heru Susanto; Widayat Widayat; Adi Darmawan
Indonesian Journal of Chemistry Vol 21, No 2 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.55522

Abstract

NiO/silica-rich zeolite catalysts were used for coconut oil hydrocracking. The catalyst was prepared with a mixture of Na2SiO3, Al(OH)3, NaOH, and quaternary ammonium surfactants. The surfactant was varied of types like as tetrapropylammonium bromide (TPAB) and cetyltrimethylammonium bromide (CTAB). The acidity of the silica-rich sodalite zeolites enhances with the increase in nickel oxide added through a wet impregnation. The hydrocracking process was carried out by a semi-batch method. Liquid products were analyzed using GC-MS. The results showed that the addition of surfactants increased the catalyst surface area and acidity. Meanwhile, the presence of nickel oxide increases the acidity of the catalyst. The hydrocracking results showed an increase in gas products when the surface area was high, i.e., 23.781% in silica-rich sodalite zeolite without template (Z), 32.68% in silica-rich sodalite zeolite with tetrapropylammonium (ZTPA), and 39.673% in silica-rich sodalite zeolite with cetyltrimethylammonium (ZCTA). The presence of NiO increased the liquid product and the selectivity of the bioavtur fraction (C10-C15), where the highest percentage of liquid product was 60.07% at NiO/ZTPA.
Improving the Electrical Conductivity of the Composite Comprising Bismuth Oxide, Activated Carbon, and Graphite for Use as a Battery Anode Yayuk Astuti; Faradina Azahra Zaqia; Aulia Zahra Ekaningsih; Gunawan Gunawan; Adi Darmawan
Indonesian Journal of Chemistry Vol 23, No 6 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.74155

Abstract

This research is concerned with the synthesis and characterization of a composite material that may be used as a battery electrode. Bismuth oxide (Bi2O3) was synthesized from Bi(NO3)3·5H2O, Na2SO4, and NaOH mixed with commercial activated carbon and graphite. The composite formation process was carried out using the hydrothermal method at 110 °C for 5 h. The characterization data indicated the composites produced contained Bi2O3 with a monoclinic crystal system, and Bi2O3 particles were evenly distributed in the composite. The composites were characterized to be mesoporous, with the electrical conductivity reaching 10−1 S m−1. The development of this composite material has potential applications in the field of energy storage, particularly in the development of battery anode.
Co-Authors . Widayat Agus Subagio Agus Sufyan Ahmad Kusumaatmaja Ahmad Suseno Andrew Pradana Putra Anna Sumardi Anna Sumardi Aptar Eka Lestari Aptar Eka Lestari Artha Monica Andini Aulia Rahma Aulia Zahra Ekaningsih Azwar Thaib Brigita Maria Listyani Choiril Azmiyawati Choiril Azmiyawati Cut Rahmawati Dwi Rasy Mujiyanti Endang Sawitri Erdina Lulu Atika Rampun Evan Evan Faradina Azahra Zaqia Febio Dalanta Gunawan Gunawan Hadhi Nugroho Hanifa Zakiyatul Urbach Heru Susanto Indriana Kartini Isna Syauqiah Isna Syauqiah Kristinawati, Leny Lathifah Puji Hastuti Lia Handayani Lia Handayani Linda Suci Wati Linda Suciwati Linda Suyati Listiana Listiana Lusiana, RA. M. Fajar Sidiq, M. Fajar Marta Chandra Anikke Putri Muslimin Muslimin Mustaqim , Muthia Elma Nurhayati Nurhayati Nurhayati Nurhayati P Siahaan Pardoyo Pardoyo Pardoyo Pardoyo Purnomo, Slamet Agus Silviana Silviana Sriatun Sriatun Suhartana Suhartana Wasino Hadi Rahmanto Yanti Mawaddah Yanti Mawaddah Yayuk Astuti Zaini Lambri Assyaifi Zaini Lambri Assyaifi