In situ fabrication of porous biochar reinforced W18O49 nanocomposite for methylene blue photodegradation

Li, Yi, Chen, Wenting, Liu, Zhiwei, Cao, Dehua, Chen, Yu, Thummavichai, Kunyapat, Wang, Nannan and Zhu, Yanqiu (2022) In situ fabrication of porous biochar reinforced W18O49 nanocomposite for methylene blue photodegradation. RSC Advances, 12 (23). pp. 14902-14911. ISSN 2046-2069

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Abstract

In this paper, a novel cow dung based activated carbon (CDAC) was successfully modified by W18O49 nanowires as a photocatalyst using KOH activation and a hydrothermal method. The activity of photocatalytic degradation of methylene blue (MB) under full-spectrum light illumination shows great improvement, and the degradation rate of MB could reach 98% after 240 min (67% for W18O49), with a final degradation rate of 98%. The porous structure with specific surface area of CDAC (∼479 m2 g−1) increases the adsorption of W18O49 reactants and also raises the concentration of reactants in the photocatalytic region. The high electrical conductivity and good electron storage capacity of CDAC allow the electrons excited in the conduction band (CB) of W18O49 to migrate smoothly into CDAC, which are the keys to enhancing the photocatalytic activity. Moreover, the photocatalytic mechanism was proposed. The results show that the CDAC/W18O49 nanowire composite can be used as an efficient photocatalyst for removal of MB dye from wastewater and indicate remarkable future potential in dye wastewater treatment technologies.

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