Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 1, Pages 418-430Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-13520-6
Keywords
Graphene; ZnO; ZnO-graphene; Methylene blue; Photodegradation
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Funding
- Government College University Faisalabad Pakistan
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The study reports the synthesis of ZnO-reduced graphene oxide catalyst for degradation of methylene blue, showing its high efficiency in dye removal and recyclability. Analysis of reaction kinetics revealed the Langmuir-Hinshelwood mechanism as the main kinetics mechanism for photodegradation of methylene blue.
Photocatalytic treatment is one of the techniques used for the treatment of dyes-contaminated wastewater. It is important to develop an effective visible-light-driven catalyst for the treatment of dyes-contaminated wastewater. This study reports the synthesis of ZnO-reduced graphene oxide catalyst for the degradation of methylene blue. Graphene oxide was prepared by Hammer and Offeman process, while ZnO-rGO (1:1) was prepared by the chemical reduction method. The prepared ZnO-rGO composite was characterized by XRD, TEM, SEM, UV-Vis, DRS, N-2 adsorption-desorption, FTIR, and XPS analyses. The photocatalytic activity was evaluated by photodegradation of methylene blue solution under irradiation. It was found that ZnO-rGO is capable of removing the dye from water and achieved the highest dye degradation efficiency of similar to 99% within 60 min. Furthermore, the ZnO-rGO was recycled in degradation experiments without any loss in its catalytic performance. The reaction kinetics was described in terms of the Langmuir-Hinshelwood mechanism, one of the kinetics mechanisms of surface catalyzed reaction. 36.2 and 13.1 kJ/mol were calculated as the apparent and true activation energy for photodegradation of methylene blue respectively.
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