Zhang, Qijun Wu, Yufeng Li, Lili Zuo, Tieyong Sustainable Approach for Spent V<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>/TiO<sub>2</sub> Catalysts Management: Selective Recovery of Heavy Metal Vanadium and Production of Value-Added WO<sub>3</sub>–TiO<sub>2</sub> Photocatalysts In order to control nitrogen oxides emissions, V<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>/TiO<sub>2</sub> catalysts are widely applied in coal-fired power plants. Consequently, a large number of V<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>/TiO<sub>2</sub> catalysts are spent annually because of their short operating life. Although these spent catalysts contain amounts of heavy metals, they have also been regarded as a potential secondary resource for the recovery of valuable elements titanium, tungsten, and vanadium. Therefore, this study developed an efficient method for selective leaching of heavy metal vanadium with an “H<sub>2</sub>SO<sub>4</sub> + Na<sub>2</sub>SO<sub>3</sub>” acid reduction system. The use of this leaching solution achieved nearly 100% efficiency in vanadium removal, and the effects of the leaching parameters on the vanadium leaching efficiencies were investigated. Subsequently, the titanium-enriched residue obtained from the leaching process was used to produce high-performance WO<sub>3</sub>–TiO<sub>2</sub> photocatalysts with dominant {001} facets via a hydrothermal treatment. The influence of the amount of hydrogen fluoride on the morphology and percentage exposure of the {001} facets of the photocatalysts was studied systematically. The method proposed in this study constitutes a novel and sustainable approach for the disposal of spent V<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>/TiO<sub>2</sub> catalysts. WO;elements titanium;Selective Recovery;control nitrogen oxides emissions;hydrogen fluoride;percentage exposure;titanium-enriched residue;vanadium removal;leaching parameters;leaching process;metal vanadium;hydrothermal treatment;power plants;Sustainable Approach;catalyst;Na 2;vanadium leaching efficiencies;Heavy Metal Vanadium;TiO;leaching solution 2018-07-28
    https://acs.figshare.com/articles/journal_contribution/Sustainable_Approach_for_Spent_V_sub_2_sub_O_sub_5_sub_WO_sub_3_sub_TiO_sub_2_sub_Catalysts_Management_Selective_Recovery_of_Heavy_Metal_Vanadium_and_Production_of_Value-Added_WO_sub_3_sub_TiO_sub_2_sub_Photocatalysts/6953150
10.1021/acssuschemeng.8b03192.s001