Synthesis of hierarchically structured T-ZnO-rGO-PEI composite and their catalytic removal of colour and colourless phenolic compounds
- Authors
- Ramu, A. G.; Yang, D. J.; Al Olayan, Ebtesam M.; AlAmri, Ohoud D.; Aloufi, Abeer S.; Almushawwah, Jory Omer; Choi, Dongjin
- Issue Date
- Mar-2021
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- 4-nitrophenol; Bisphenol A; Catalytic reduction; Polyethylenimine; T-ZnO
- Citation
- CHEMOSPHERE, v.267
- Journal Title
- CHEMOSPHERE
- Volume
- 267
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/15598
- DOI
- 10.1016/j.chemosphere.2020.129245
- ISSN
- 0045-6535
- Abstract
- Phenolic compounds bisphenol A (BPA) and 4-nitrophenol (4-NP) are the prime water contaminants. As reported, these compounds are some of the highly hazardous ones to the human and living species. In this study, T-ZnO-rGO-PEI composite was synthesized employing hydrothermal method and the obtained composite samples were systematically characterized by FTIR, XPS, FE-SEM and HR-TEM studies. The FTIR, XPS analysis confirmed the successful surface modification of T-ZnO-rGO-PEI composite. The FE-SEM morphology confirmed the formation of ZnO (arm length about 2.5 mu m) tetrapod structured in synthesized T-ZnO-rGO-PEI composite. The thickness of formed ZnO arm (0.44 mu m) was increased after the polymer coating which confirmed the successful surface modification by PEI polymer. The HR-TEM images confirm the uniform coating of PEI polymer on T-ZnO-rGO surface. The catalytic activity and adsorption capacity of the synthesized T-ZnO-rGO-PEI composite was successfully explored using 4-nitrophenol and bisphenol-A as model pollutants .T-ZnO-rGO-PEI composite and found that 4-NP reduction reaction was completed within 10 min with the rate of 0.224 min(-1). The BPA adsorption over T-ZnO-rGO-PEI exhibited high adsorption rate of 0.0210 min(-1). In addition, the detailed 4-NP reduction and BPA adsorption mechanism was demonstrated. Hence the synthesized T-ZnO-rGO-PEI composite is a promising catalyst for the removal of micropollutants in aqueous medium. (C) 2020 Elsevier Ltd. All rights reserved.
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