Enhancement of adsorption-photocatalysis of malachite green using oil palm biomass-derived activated carbon/titanium dioxide composite

Pang, Yean Ling and Teh, Wen Siang and Lim, Steven and Abdullah, Ahmad Zuhairi and Ong, Hwai Chyuan and Wu, Chien-Hou (2021) Enhancement of adsorption-photocatalysis of malachite green using oil palm biomass-derived activated carbon/titanium dioxide composite. Current Analytical Chemistry, 17 (5). pp. 603-617. ISSN 1573-4110, DOI https://doi.org/10.2174/1573411016666200106105903.

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Nowadays, effective wastewater treatment has become a hot research topic in the field of environment. A series of novel activated carbon/titanium dioxide (AC/TiO2) composites at various weight ratio were synthesised using the sol-gel method and were characterised using XRD, SEM-EDX, FT-IR, TGA and surface area analysis. Methods: TiO2 particles were successfully incorporated on the AC surface and were mainly composed of Ti, O and C atoms. The AC/TiO2 composites were made up of spherical TiO2 particles agglomerated on the smooth tubular and porous structure of AC. The photocatalytic efficiency was influenced by the weight proportion of AC:TiO2 and the degradation process was attributed to the adsorption and photocatalytic processes. Results: It was found that 2.5 g/L AC/TiO2 at a weight ratio of 3:1 on an initial Malachite Green concentration of 10 mg/L at 50 degrees C led to a degradation efficiency of 96.3% in 7.5 minutes under a halogen lamp. A chemical oxygen demand (COD) removal of 96.7% was also recorded. Reusability of the AC/TiO2 composite and kinetic study of the photodegradation of Malachite Green were also investigated. The recycled AC/TiO2 composite achieved high catalytic performance (83.1%) after one catalytic cycle. Conclusion: The degradation kinetics of Malachite Green at various solution temperatures were fitted to the pseudo-first-order reactions and the activation energy for the degradation of Malachite Green was 21.48 kJ/mol. This work demonstrated that AC/TiO2 composite is a promising material for photocatalytic degradation of organic dyes.

Item Type: Article
Funders: Centre for Photonics and Advanced Materials Research, Ministry of Education (MOE) Malaysia [FRGS/1/2018/TK10/UTAR/02/2]
Uncontrolled Keywords: Activated carbon; Adsorption-photocatalysis; Biomass; Empty fruit bunch; Malachite green; TiO2
Subjects: Q Science > QD Chemistry
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Faculty of Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 07 Apr 2022 03:43
Last Modified: 12 Apr 2022 06:06
URI: http://eprints.um.edu.my/id/eprint/28352

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