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Applicability of BaTiO 3/graphene oxide (GO) composite for enhanced photodegradation of methylene blue (MB) in synthetic wastewater under UV-vis irradiation

Zhu, Mengting and Kurniawan, Tonni Agustiono and Fei, Song and Tong, Ouyang and Othman, Mohd. Hafiz Dzarfan and Rezakazemi, Mashallah and Shirazian, Saeed (2019) Applicability of BaTiO 3/graphene oxide (GO) composite for enhanced photodegradation of methylene blue (MB) in synthetic wastewater under UV-vis irradiation. Environmental Pollution, 255 . p. 113182. ISSN 0269-7491

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Official URL: http://dx.doi.org/10.1016/j.envpol.2019.113182

Abstract

Methylene blue (MB) is a dye pollutant commonly present in textile wastewater. We investigate and critically evaluate the applicability of BaTiO3/GO composite for photodegradation of MB in synthetic wastewater under UV–vis irradiation. To enhance its performance, the BaTiO3/GO composite is varied based on the BaTiO3 weight. To compare and evaluate any changes in their morphologies and crystalline structures before and after treatment, BET (Brunauer–Emmett–Teller), XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy) and TEM (transmission electron microscopy) tests are conducted, while the effects of reaction time, pH, dose of photocatalyst and initial MB concentration on its photodegradation by the composite are also investigated under identical conditions. The degradation pathways and removal mechanisms of MB by the BaTiO3/GO are elaborated. It is evident from this study that the BaTiO3/GO composite is promising for MB photodegradation through ·OH. Under optimized conditions (0.5 g/L of dose, pH 9.0, and 5 mg/L of MB concentration), the composite with 1:2 dose ratio of BaTiO3/GO has the highest MB degradation rate (95%) after 3 h of UV vis irradiation. However, its treated effluents still could not comply with the discharge standard limit of less than 0.2 mg/L imposed by national environmental legislation. This suggests that additional biological treatments are still required to deal with the remaining oxidation by-products of MB, still present in the wastewater samples such as 3,7-bis (dimethyl-amino)-10H-phenothiazine 5-oxide.

Item Type:Article
Uncontrolled Keywords:Refractory pollutant, Textile wastewater
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:87624
Deposited By: Widya Wahid
Deposited On:30 Nov 2020 17:06
Last Modified:30 Nov 2020 17:06

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