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All Journal Bulletin of Chemical Reaction Engineering & Catalysis
Setiadi Setiadi
Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Photocatalytic Degradation of Polyethylene Microplastics and Disinfection of E. coli in Water over Fe- and Ag-Modified TiO2 Nanotubes Yuwendi Yuwendi; Muhammad Ibadurrohman; Setiadi Setiadi; Slamet Slamet
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.13400.263-277

Abstract

In this study, Fe- and Ag-modified TiO2 nanotubes were synthesized via an anodization method as photocatalysts for degradation of polyethylene microplastics and disinfection of Escherichia coli (E. coli). The anodization voltage, as well as the Fe3+ or Ag+ concentrations on TiO2 nanotubes were evaluated and correlated to their corresponding photocatalytic properties. TiO2 nanotubes were firstly synthesized by anodization of Ti plates in a glycerol-based electrolyte, followed by incorporation of either Fe or Ag via a Successive Ionic Layer Adsorption and Reaction (SILAR) method with Fe(NO3)3 and AgNO3 as Fe and Ag precursors, respectively. UV-Vis DRS shows that the addition of Fe or Ag on TiO2 nanotubes causes a redshift in the absorption spectra. The X-ray diffractograms indicate that, in the case of Fe-modified samples, Fe3+ was successfully incorporated into TiO2 lattice, while Ag scatters around the surface of the tubes as Ag and Ag2O nanoparticles. A microplastic degradation test was carried out for 90 mins inside a photoreactor with UVC illumination. TiO2 nanotubes that are anodized with a voltage of 30 V exhibit the best degradation results with 17.33% microplastic weight loss in 90 mins. Among the modified TiO2 nanotubes, 0.03 M Ag-TiO2 was the only one that surpassed the unmodified TiO2 in terms of microplastic degradation in the water, offering up to 18% microplastic weight loss in 90 min. In terms of E. coli disinfection, 0.03M Ag-TiO2 exhibit better performance than its unmodified counterpart, revealing 99.999% bactericidal activities in 10 mins. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Synthesis and Characterization of Indonesian Natural Zeolite as a Potential Support Material for n-Hexane Isomerization Catalyst Fachrul Rozy; Tania Surya Utami; Setiadi Setiadi; Wawan Rustyawan
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 4 Year 2026 (December 2026) (Issue in Progress)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20781

Abstract

The demand for high-quality fuel with a high-octane number or Research Octane Number (RON) continues to increase due to strict emission standards and the ban on lead-based additives. This study aims to develop a catalyst material based on Indonesian natural zeolites from Lampung (ZAL), Bayah (ZAB), and Tasikmalaya (ZAT) through pre-treatment optimization to obtain comparable mesoporous material properties with Mobil Composition of Matter No. 41 (MCM-41). This catalyst is designed for the isomerization process of n-hexane into iso-hexane as a model compound for light naphtha. The research focuses on utilizing Indonesian natural zeolite in combination with desilication techniques using NaOH and cetyltrimethylammonium bromide (CTAB) as surface directing agents. The catalyst is characterized by using X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Surface Area Analysis (SAA), and Scanning Electron Microscopy (SEM) to identify the surface morphology of zeolite. XRD results show structural alteration in the low-to-high θ/2θ region with increasing NaOH concentration. XRF analysis reveals that the bulk Si and Al contents remain relatively stable (Si: 34.73-36.6 wt%; Al: 6.55-8.1 wt%), confirming that desilication occurs selectively at the crystal surface rather than altering the bulk composition. SAA data demonstrate substantial enhancement of textural properties, with the specific surface area increasing from 40.5 to 131.7 m²/g for ZAL, 36.5 to 134.9 m²/g for ZAT, and 46.9 to 101.0 m²/g for ZAB after 1.5 M NaOH treatment. SEM images reveal morphological changes from a defined crystalline texture to a more dispersed surface upon increasing NaOH concentration. Copyright © 2026 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).
Co-Authors Fachrul Rozy Farida Isroani Muhammad Ibadurrohman Slamet . Tania Surya Utami Wawan Rustyawan Yuwendi Yuwendi