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All Journal Journal of Social Research Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences
Saputera, Wibawa Hendra
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Social Sciences

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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).
Investigating the Performance of a 50MW CFB Boiler in a Coal-Fired Power Plant through Co-Firing with Gamal Biomass and RDF Suryanugraha, Arifta; Saputera, Wibawa Hendra; Wulandari, Winny
Journal of Social Research Vol. 4 No. 7 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i7.2566

Abstract

The co-firing program at coal-fired power plants (CFPP) is part of PT PLN (Persero)’s short-term strategy to support Indonesia’s Net Zero Emission (NZE) target by 2060. Biomass and Refuse-Derived Fuel (RDF) are among the promising co-firing fuels. Biomass is considered carbon-neutral, while RDF helps reduce environmental waste. This study evaluates the technical effects of co-firing Gamal and RDF at blending percentages of 5%, 15%, and 30%, focusing on boiler performance and plant efficiency. SteamPRO software by Thermoflow was utilized to simulate and analyze the power plant’s thermodynamic performance under each co-firing condition. The simulations show that fuel specification or fuel composition and calorific value significantly affect key performance parameters. Co-firing with Gamal increases the Net Plant Heat Rate (NPHR) from 3034 kcal/kWh (baseline) to 3065, 3136, and 3264 kcal/kWh for 5%, 15%, and 30% co-firing, respectively. Plant efficiency correspondingly declines from 28.35% to 28.05%, 27.42%, and 26.35%. Boiler efficiency also drops from 83.69% to 82.98%, 81.47%, and 78.92%. RDF, in comparison, results in smaller deviations, with NPHR reaching only 3062 kcal/kWh and plant efficiency decreasing slightly to 28.08% at 30% co-firing. The lower calorific value of Gamal (2481 kcal/kg) increases the total fuel flow and raises auxiliary power consumption in the draught system, especially in the PA, SA, and ID fans, whereas RDF causes only minimal deviations. Emission results show that Gamal, with 0.07% sulfur, reduces SO? emissions from 0.474 to 0.4326 kg/MWh at 30% co-firing, while RDF increases it to 0.4905 kg/MWh due to higher sulfur content (0.42%). Uncorrected CO? emissions rise with Gamal but decrease after applying the carbon-neutral factor, from 984 to 730 kg/MWh at 30%. These results emphasize the importance of co-firing fuel specification selection and blending percentage optimization to balance performance and environmental outcomes.
Tailoring BiOBr Photocatalyst: In-situ Bi Doping for Enhanced Photocatalytic Removal of Sulfamethoxazole (SMX) Antibiotic Fauziyen, Sabrina Prima; Saputera, Wibawa Hendra; Sasongko, Dwiwahju
Journal of Engineering and Technological Sciences Vol. 56 No. 2 (2024)
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.2024.56.2.7

Abstract

There is a notable emphasis on the development of photocatalysts to degrade antibiotics, such as sulfamethoxazole (SMX), in aquatic environments due to their persistence and associated toxicological impacts. In this study, BiOBr photocatalysts were synthesized by incorporating in-situ Bi doping. Various Bi/BiOBr composites were produced through a hydrothermal method at varying temperatures and subsequently characterized using X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), X-ray fluorescence (XRF), and nitrogen adsorption-desorption isotherm. The characterization data revealed that the Bi-metal began to emerge at a hydrothermal temperature of 180 °C (BB180) in the BiOBr-based semiconductor and completed its conversion to Bi-metal at a hydrothermal temperature of 270 °C (BB270). This transformation leads to the generation of Bi3+ in conjunction with oxygen vacancies, acting as active electron traps and enhancing the separation efficiency of light-induced electron-hole pairs. This results in a narrow band gap of Bi/BiOBr photocatalyst, increasing its sensitivity towards visible light. BB180 exhibited the highest photocatalytic rate in the degradation of SMX with a removal efficiency of 74.35% within 4 hours of reaction under Xenon lamp irradiation and an apparent rate constant of 6.5 x 10-3 min-1, surpassing the commercial TiO2 Degussa P25. This finding opens up a new pathway for the development of a catalyst responsive to visible light, specifically designed for the detoxification of antibiotics in wastewater.
Co-Authors Aghietyas Choirun Az Zahra Auliardi, Dzaky Devianto, Hary Dwiwahju Sasongko Fauziyen, Sabrina Prima Rizkiana, Jenny Suryanugraha, Arifta Tatang Hernas Soerawidjaja Thadeo, Francesco Winny Wulandari, Winny