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All Journal Jurnal Matematika & Sains The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Indonesian Journal of Biotechnology CHEESA: Chemical Engineering Research Articles Jurnal Kartika Kimia Indonesian Journal of Physics (IJP) Indonesian Chimica Letters Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences
Veinardi Suendo
Departemen Kimia, Institut Teknologi Bandung
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics

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Pengaruh Variasi Dopan Asam Terhadap Kinerja Baterai Sekunder Polianilina|Zn Akbar, Said Ali; Suendo, Veinardi; Rochliadi, Achmad
CHEESA: Chemical Engineering Research Articles Vol. 3 No. 1 (2020)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.282 KB) | DOI: 10.25273/cheesa.v3i1.6702

Abstract

Studi tentang baterai sekunder polianilina(PAni)|Zn telah banyak dikembangkan, tetapi sejauh ini masih belum ada penjelasan mengenai pengaruh asam terhadap kinerja baterai tersebut. PAni disitensis menggunakan metoda elektrodeposisi dengan tegangan 0,7 V selama 30 menit. PAni hasil sintesis dikarakterisasi menggunakan Voltammetri dan Spektroskopi Inframerah. Baterai PAni|Zn didesain dalam bentuk sandwich, kemudian pengukuran kinerja digunakan impedansi serta pengisian-pengosongan. Baterai dengan elektroda PAni-Cl dan PAni-Br mempunyai kinerja yang lebih baik dengan specific capacity saat ke-60 yaitu 55,4 dan 37,4 mAh g-1. Pengukuran impedansi pada baterai dengan elektroda PAni-Cl, PAni-Br, dan PAni HClO4, menunjukan resistance solution (Rs) secara berurutan yaitu 1,38; 2,56; dan 3,03 W dan resistance charge transfer (Rct) 2,24; 2,97; dan 7,71 W. Oleh sebab itu, baterai PAni|Zn dengan dopan HCl menunjukkan kinerja terbaik dibanding dengan asam yang lain.
Sustainable Green Synthesis of ZnO Photocatalysts Using Shallot Peel Extract as Capping Agent for Efficient Photodegradation of Rhodamine B Didi Prasetyo Benu; Cindy Claudia Christanti; I Gede Arya Wiguna; Fry Voni Steky; Veinardi Suendo
Jurnal Kartika Kimia Vol 9 No 1 (2026): Jurnal Kartika Kimia
Publisher : Department of Chemistry, Faculty of Sciences and Informatics, University of Jenderal Achmad Yani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26874/jkk.v9i1.1103

Abstract

Green synthesis strategies offer a sustainable approach for preparing semiconductor photocatalysts with tunable properties. In this study, ZnO particles were synthesized using shallot peel extract, and their structural, morphological, optical, and photocatalytic properties were systematically investigated. Structural characterization by Raman spectroscopy and X-ray diffraction confirmed the formation of phase-pure wurtzite ZnO, with crystallite sizes in the nanometer range. Scanning electron microscopy revealed hexagonal rod-like morphologies with dimensions of 1–2 μm, which are interpreted as polycrystalline assemblies of aggregated nanocrystallites. Optical analysis using UV–Vis diffuse reflectance spectroscopy showed a direct bandgap of 3.02 eV and additional visible-light absorption, which may be associated with defect states and possible extrinsic contributions. Photoluminescence spectroscopy exhibited green emission attributed to intrinsic defects. The photocatalytic performance of the synthesized ZnO was evaluated through the removal of Rhodamine B under irradiation, achieving a maximum removal efficiency of 97.68% within 150 min. Kinetic analysis indicated that the process follows a pseudo-first-order model with an apparent rate constant of 0.0290 min⁻¹. The observed photocatalytic performance may be associated with the structural and optical characteristics of the synthesized ZnO. However, the specific roles of these factors, as well as the contribution of adsorption, cannot be conclusively distinguished in the absence of a control sample. Overall, this study provides insight into the relationship between synthesis conditions and the resulting properties of green-synthesized ZnO, while highlighting the need for further investigation to clarify the underlying mechanisms. This work demonstrates that shallot peel extract is an effective and environmentally benign capping agent for engineering ZnO photocatalysts with high efficiency for wastewater treatment applications.
Polyoxometalates as Catalysts for Biomass Conversion: Properties, Applications, and Regenerability Haryo P. Winoto; Rezky O. Anggaswara; Dian H. Wahyudi; Rino R. Mukti; Veinardi Suendo; Ismunandar Ismunandar
Journal of Engineering and Technological Sciences Vol. 58 No. 3 (2026): Vol. 58 No. 3(2026): June
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.2026.58.3.2

Abstract

Polyoxometalates (POMs) have emerged as exceptionally versatile catalysts for green chemical reactions, demonstrating significant potential in the sustainable valorization of biomass. Their tunable Brønsted/Lewis acidity and redox properties enable a broad range of chemical transformations, offering remarkable flexibility in process design. This mini review provides a summary of recent advances in the thermocatalytic conversion of biomass using POMs, addressing their utilization as both homogeneous and heterogeneous catalysts. Key reaction pathways, including solvolysis, oxidation, esterification, and condensation, are highlighted as fundamental processes in biomass valorization. A central focus is placed on the crucial challenge of catalyst regenerability and stability, examining strategies to ensure the long-term viability and economic feasibility of these systems while facing the apparent low-temperature stability challenge of POMs. Finally, this review synthesizes current regeneration methods and presents a forward-looking perspective on the future challenges and opportunities in the field of biomass conversion catalyzed by polyoxometalates.
Potential of Tannin Extract From Coffee Grounds as an Exfoliant in Ultrasonic-Assisted Graphene Synthesis and Optimized Response Surface Methodology Bagaskara, Eldo Delta; Nela Mafazah; Muhammad Reza; Sudirman; Fry Voni Steky; Veinardi Suendo
Indonesian Chimica Letters Vol. 5 No. 1 (2026)
Publisher : Department of Chemistry, FMIPA, UNEJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v5i1.60005

Abstract

Graphene is a carbon-based nanomaterial with excellent electrical, thermal, and mechanical properties, making it very promising for various advanced applications. However, conventional graphene synthesis methods generally involve hazardous chemicals and environmentally unfriendly processes. This study investigated the use of tannin extract derived from coffee grounds as a green exfoliating agent for sustainable graphene synthesis via liquid-phase exfoliation. The effects of graphite:tannin ratio, ultrasonication time, and ultrasonication temperature on graphene formation were evaluated using the Response Surface Method (RSM) with Box–Behnken Design. The synthesized graphene was characterized using UV-Vis spectrophotometry and Raman spectroscopy. The UV-Vis response was represented by Absorption Peak Area (APA), while the quality of the graphene layer was evaluated using the Raman I2D/IG ratio. The results showed that lower graphite:tannin ratios generally resulted in better APA and I2D/IG responses, indicating the important role of tannin in exfoliation and dispersion stabilization through π–π stacking interactions. Longer ultrasonication time improved the exfoliation efficiency by maximizing the cavitation intensity. Qualitative observations after 5 days of storage showed that the dispersion with higher tannin concentration exhibited slower sedimentation and reduced re-stacking tendency. RSM optimization showed optimal parameters at a graphite:tannin ratio of 2 mg/mL, an ultrasonication time of 60 min, and an ultrasonication temperature of 54 °C, resulting in a predicted response of 0.009 for APA and 0.548 for I2D/IG
Co-Authors Aksarani ‘Sa Pratiwi Annisa A Putri Anton Prasetyo Arie Hardian Auliya Nur Amalina Bagaskara, Eldo Delta Benu, Didi Prasetyo Christanti, Cindy Claudia Cynthia L. Radiman Damar Rastri Adhika Dian H. Wahyudi Erna Febriyanti Fenny M Dwivany Fry Voni Steky Fry Voni Steky Fry Voni Steky Haryo P. Winoto I Gede Arya Wiguna Ismunandar Ismunandar Listiana Oktavia Muhammad Nur Tajuddin Muhammad Reza Muhammad Reza Mulyani, Irma Nela Mafazah Novitrianc Novitrianc Nugraha, Ashari Budi Nur Aini Phutri Milana Rezky O. Anggaswara Rino R. Mukti Rino Rakhmata Mukti Risa Rahmawati Sunarya Rizkita R Esyanti Rochliadi, Achmad Said Ali Akbar Sheley Marela Sparisoma Viridi Sudirman Sunarya, Risa Rahmawati Sustini, Euis Viny Veronika Tanuwijaya Viny Veronika Tanuwijaya Yuliany Yuliany