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Journal of Applied Materials and Technology
Published by Universitas Riau
ISSN : 2721446X     EISSN : 26860961     DOI : https://doi.org/10.31258/Jamt
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering
Journal of Applied Materials and Technology (JAMT) is aimed at capturing current development and initiatives in applied materials and technology. JAMT showcases innovative applied materials and technology, providing an opportunity for science, transfer and collaboration of technology. JAMT focuses on the publication in the area of material science, material engineering and technology, renewable energy, sustainable material and construction method. The selected, high-quality reviews, research reports at the state of the art of the science and material technology are welcomed.
Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)
Articles 72 Documents
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Graphene Oxide–TiO2 composite materials for photocatalytic degradation of organic pollutants in water treatment Caroliny Fernandes de Carvalho; Adhimar Flávio Oliveira; Maria Elena Leyva Gonzalez; Vander Alkmin dos Santos Ribeiro; Celso Henrique Correa Carvalho
Journal of Applied Materials and Technology Vol. 7 No. 2 (2026): March 2026
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.7.2.74-84

Abstract

The increasing presence of recalcitrant organic pollutants in water bodies has driven the development of advanced treatment technologies capable of promoting effective degradation beyond conventional processes. In this study, a graphene oxide (GO)–titanium dioxide (TiO2) composite was synthesized via a chemical route and evaluated for photocatalytic degradation of methylene blue under UVC irradiation. Graphene oxide was produced by electrochemical exfoliation of graphite, followed by incorporation into TiO2 at 5 wt.% to form the TiO2:GO5 composite. Structural and morphological characterizations by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and FTIR confirmed the formation of anatase-phase TiO2 and successful integration of GO without secondary phase formation. Photocatalytic performance was assessed by monitoring dye concentration decay over 5 h of irradiation. The TiO2:GO5 composite achieved more than 70% methylene blue removal, reaching a final C/C0 value of 0.28, compared to 0.29 for pure TiO? under identical conditions. The degradation followed pseudo-first-order kinetics, with apparent rate constants of 2.302 × 10-¹ h-¹ for the composite and 2.241 × 10-¹ h-¹ for pure TiO2, corresponding to a 2.7% increase in reaction rate. Enhanced initial adsorption and slightly faster absorbance decay were observed for the composite throughout the irradiation period. Although the performance enhancement is moderate, the incorporation of graphene oxide improved charge separation and adsorption behavior without requiring high-temperature calcination. These findings demonstrate that GO modification represents a viable strategy to enhance TiO2 photocatalytic activity under energy-efficient synthesis conditions, highlighting its potential application in advanced water and wastewater treatment systems.
Application of acidic treated peanut shell biochar in methyl orange removal from aqueous medium: elucidating isotherms, kinetics and proposed mechanism Erik Souza Pereira; Ralf Ramalho Junior; Sandro José de Andrade
Journal of Applied Materials and Technology Vol. 8 No. 1 (2026): September 2026
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.8.1.1-9

Abstract

The urgent need for sustainable water treatment solutions has driven global scientific efforts toward developing novel materials. Biochar, a low-cost material produced from biomass waste, represents a promising and versatile adsorbent class. In this study, acid-treated peanut shell biochar (PS-BC) was synthesized and evaluated for the removal of the methyl orange (MO) dye from aqueous solution. Characterization via Fourier Transform Infrared Spectroscopy (FT-IR) confirmed the presence of carbonaceous groups, such as C=O, C-O, C=C and derived phosphoric groups, such as P=O. Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) revealed a mesoporous and macroporous structure, while X-ray Diffraction (XRD) indicated a predominantly amorphous material containing amorphous SiO2 phases. The adsorption was followed by monitoring 464 nm band of MO in UV-Vis spectroscopy, and the adsorbent achieved a maximum removal of above 89% of MO within a 60-minute experiment. The adsorption kinetics were analysed in pseudo-first and pseudo-second models, which the adsorption was described better by the pseudo-first-order model. Also, adsorption isotherms (Langmuir, Freundlich and Temkin) were studied, and the equilibrium data closely fit the Langmuir isotherm model, pointing to monolayer adsorption onto a homogeneous surface. The FT-IR analysis of post-adsorbed PS-BC confirmed bands associated to MO, such as N=N, SO3- and change in aromatic C=C, indicating the possible adsorption pathways. These results confirm the successful application of the acid-treated PS-BC as an efficient and eco-friendly adsorbent for organic pollutant removal from water.

Page 8 of 8 | Total Record : 72

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