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All Journal CHEESA: Chemical Engineering Research Articles Faraday: Journal of Fundamental Physics, Research, and Applied Science
Reffany Choiru Rizkiarna
Universitas Pembangunan Nasional "Veteran" Jawa Timur
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Hexavalent Chromium Reduction of Artificial Waste Using Resin Immobilized Photocatalyst TiO2 Moch. Andy Wibisono; Euis Nurul Hidayah; Baranitharan Ethiraj; Reffany Choiru Rizkiarna
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 2 (2025): In Progress
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i2.23078.86-92

Abstract

Photocatalysis is a process that can be used to reduce hexavalent chromium in wastewater. Therefore, this study aimed to analyze the effect of a semiconductor in the form of Resin Immobilized Photocatalyst (RIP)-TiO2 on the reduction of Cr (VI), as well as the effect of pH and catalyst mass. In the process, RIP-TiO2 was produced using rutile crystal TiO2 and cation resin. The study was conducted in a column bed with continuous flow and UV lamp irradiation. Sampling was performed every 5, 15, 45, and 60 minutes, as well as the use of 30 and 40 g of RIP-TiO2. The statistical results from a Two-Way Analysis of Variance (ANOVA) showed no significant differences in pH variation and catalyst mass. However, the best operating conditions were obtained at pH 5 and a catalyst mass of 40 g with a removal rate of 21.32%. These results suggested that pH adjustment had no significant effect on the reduction of Cr(VI) to Cr(III) using RIP-TiO₂ catalyst in the photocatalytic process. Further studies are needed to evaluate other factors, such as UV light intensity, contact time, and physical characteristics of the catalyst, capable of improving the efficiency of the RIP-TiO₂ system.
Review: Synthesis of rGO in Its Use as Thin Films with Various Polymer Matrices Rahma Alya Hidayah; Nenni Mona Aruan; Nur Aini Fauziyah; Reffany Choiru Rizkiarna; Alfriana Margareta
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v2i1.61

Abstract

Reduced graphene oxide (rGO) is a two-dimensional carbon material that has been widely developed as a functional filler in polymer-based thin films due to its high surface area, good electrical conductivity, and adequate interface compatibility. This article presents a literature review on the synthesis of rGO and its use as thin films with various polymer matrices, namely polyaniline (PANi), poly(vinylidene fluoride) (PVDF), poly(vinylidene fluoride–trifluoroethylene) [P(VDF-TrFE)], and chitosan. The review was conducted on open access scientific articles discussing rGO synthesis methods, thin film fabrication techniques, and structural, morphological, thermal, and electrical characterization of composite materials. The results of the study show that rGO can improve the functional performance of polymer thin films through the formation of conductive networks, strengthening of interface interactions, and crystal nucleation effects. In the PANi matrix, rGO increases electrical conductivity and stability, while in PVDF and P(VDF-TrFE), rGO promotes the formation of electroactive crystalline phases that enhance piezoelectric properties. Meanwhile, in chitosan, strong interfacial interactions improve electrochemical response and the potential for environmentally friendly sensor applications.
Co-Authors Alfriana Margareta Baranitharan Ethiraj Euis Nurul Hidayah Moch. Andy Wibisono Nenni Mona Aruan Nur Aini Fauziyah Rahma Alya Hidayah