【摘 要】
：
Vanadium (V, V) and chromium (Cr, VI) were simultaneously reduced to less-toxic V(VI) and Cr(Ⅲ) by a photocatalytic method with ZnWO4 nanoparticles prepared by hydrothermal synthesis. The reduction ef
【机 构】
：
School of Science,China University of Geosciences,Beijing 100083,P R China
【出 处】
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第十四届全国太阳能光化学与光催化学术会议
论文部分内容阅读
Vanadium (V, V) and chromium (Cr, VI) were simultaneously reduced to less-toxic V(VI) and Cr(Ⅲ) by a photocatalytic method with ZnWO4 nanoparticles prepared by hydrothermal synthesis. The reduction efficiencies could reach 68.8% for V(V) and 97.3% for Cr(VI) in 3 h, respectively, which are comparable to those by microbial fuel cell technology carried out in over 10 days. The prepared ZnWO4 nanoparticles were characterized by XRD, SEM, EDS, TEM, and Uv-vis-DRS tests. Electrochemical calculation shows high acidity benefits the rapid reduction of V(V) and Cr(VI). In addition, the applied ZnWO4 nanoparticles could be recycled and reused for 5 repeated photocatalytic reduction runs. And after 5 runs, the recycled ZnWO4 nanoparticles could also present good photocatalytic reduction activity with a reduction efficiency of about 60% for V(V) and 90% for Cr(VI). The new procedure on the simultaneous reduction of V(V) and Cr(VI) by photocatalysis might be promisingly applied in contaminated wastewaters, combining the remediation and possible V and Cr recovery.
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