Simultaneous reduction of vanadium (V) and chromium (VI) in Wastewater by photocatalysis ZnWO4 nanor

• 作 者: ZengyingZhao[1]BaogangZhang[2]DaimengChen[1]JiangHao[1]MeiLong[1]JohnZhanhuGuo[3]ZhijianPeng[4]
• 机 构: School of Science,China University of Geosciences,Beijing 100083,P R China
• 出 处: 第十四届全国太阳能光化学与光催化学术会议
• 发表日期: 2014年期

　　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.