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[Adsorption and Photocatalytic Removal of Chromium on High-index TiO Facet]. | LitMetric

[Adsorption and Photocatalytic Removal of Chromium on High-index TiO Facet].

Huan Jing Ke Xue

Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

Published: February 2019

Chromium (Cr) contamination caused by industrial manufacturing poses a severe challenge in the environment. Titanium dioxide (TiO) has potential application in Cr removal due to its adsorption and photocatalytic performance. High-index TiO with exposed {201} facet was synthesized using the solvothermal method and characterized by SEM, TEM, XRD, and XPS. The adsorption of Cr(Ⅲ/Ⅵ) and photocatalytic reduction of Cr(Ⅵ) on TiO{201} was examined for the removal from water. The synthesized TiO{201} was constructed by a dandelion-like hierarchical structure. The adsorption isotherms of Cr(Ⅲ) and Cr(Ⅵ) on TiO{201} conformed to the Langmuir model, with maximum adsorption capacities of 22.7 mg·g and 13.2 mg·g, respectively. The best fitted results from the Freundlich model show that the adsorption of Cr(Ⅲ) and Cr(Ⅵ) on TiO{201} were favorable with the parameter of 1/ less than 0.5. The results of photocatalytic reduction show that TiO{201} can reduce Cr(Ⅵ) to Cr(Ⅲ) under UV irradiation, and Cr(Ⅲ) was further precipitated on the surface of TiO in the form of Cr(OH) and CrO, which was evidenced by XPS characterization. To explore the mechanism of photocatalytic reduction of Cr(Ⅵ), the effect of scavengers for photogenerated holes (EDTA-2Na) and electrons (KBrO) on Cr(Ⅵ) reduction was studied, and the results suggested that photogenerated electrons were the main reductant.

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http://dx.doi.org/10.13227/j.hjkx.201806091DOI Listing

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