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All Journal Indonesian Journal of Chemistry Bulletin of Chemical Reaction Engineering & Catalysis
Long, Nguyen Quang
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Green Synthesis of Chitosan-Assisted ZnO Nanoparticles and Their Photocatalytic Application in ZnO/TiO₂ Composites for Isopropanol Degradation Hoang, Le H.; Quynh, Ho G.; Nghi, Mai H.; Phuong, Nguyen T. T.; Duong, Ngo T. H.; Long, Nguyen Quang
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 4 Year 2025 (December 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20431

Abstract

Nano-sized ZnO particles were successfully synthesized via a green, efficient, and chitosan-assisted method, which is both cost-effective and environmentally friendly. The nanoscale characteristics of the synthesized particles were confirmed through various analytical techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption–desorption isotherms, diffuse reflectance spectroscopy (DRS), and Fourier-Transform Infrared Spectroscopy (FTIR). This study primarily investigated the photocatalytic performance of ZnO/TiO₂ composites prepared by a simple mechanical mixing approach for the degradation of isopropanol (IPA) in a continuous-flow system under UVA irradiation at room temperature. A range of experimental conditions, including initial IPA concentrations, gas flow rates, relative humidity levels, and the number of UV lamps, were systematically explored. The mechanically mixed ZnO/TiO₂ nanomaterial exhibited enhanced photocatalytic activity compared to pure ZnO. Notably, while commercial TiO₂ showed reduced IPA removal efficiency under humid conditions, the ZnO/TiO₂ composite maintained superior performance, achieving a removal efficiency of 45% over a 3-hour period at 30% relative humidity with an inlet IPA concentration of about 1200 ppmv, a flow rate of 3 L/h, and illumination by four UV lamps. Copyright © 2025 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).
Enhanced Organic Pollutant Adsorption Using Zeolite-Carbon Dots Composites Synthesized by the Impregnation Method Thanh, Ho Tan; Phuc, Nguyen Thien; Khoi, Dang Dinh; Long, Nguyen Quang
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.110466

Abstract

In this study, a novel zeolite–carbon dots (ZCD) composite was synthesized via impregnation to enhance the adsorption performance of zeolite. The attachment of carbon dots (CDs) onto the zeolite surface was confirmed by SEM/EDS, TEM, BET, and FT-IR analyses. These results showed that CDs were uniformly dispersed on the FAU-type zeolite, introduced additional –OH, –CHx, and –NH2 groups, and increased the BET surface area from 444.5 to 491.5 m2 g−1. The presence of functional groups on the surface of CDs enhanced the adsorption capacity of zeolite. Notably, ZCD exhibited a 45% higher adsorption capacity for methylene blue (MB) than pristine zeolite, with a maximum experimental uptake of 32.53 mg g−1. Adsorption isotherm and kinetic studies, best described by the Langmuir model (qm = 29.22 mg g−1, R2 = 0.9815) and the pseudo-second-order kinetic model (R2 = 0.9991), indicated that MB uptake on ZCD occurred through both physical and chemical interactions. These results suggest that the ZCD composite is a promising adsorbent for the removal of organic dyes in water treatment applications.
Co-Authors Duong, Ngo T. H. Hoang, Le H. Khoi, Dang Dinh Nghi, Mai H. Phuc, Nguyen Thien Phuong, Nguyen T. T. Quynh, Ho G. Thanh, Ho Tan