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An integrated process of electrocatalytic reactor with nano-MnO2 loading carbon membrane electrode and nanofiltration for the high efficient removal of Arsenic from aquatic solution

ZHUJIANGREN: LIJIANXIN

DIDIAN: GUOJIAZHONGDIANSHIYANSHIDALOUSILOUZHONGTINGBAOGAOTING

亚博棋牌SHIJIAN: 2019NIAN12YUE19RI(XINGQISI)XIAWU2:00

ZHUJIANGRENJIESHAO:

LIJIANXIN,NAN,HUBEIWUHANSHIREN,NANFEISITANLINGBUSHENDAXUEBOSHI、TIANJINGONGYEDAXUECAILIAOKEXUEYUGONGCHENGXUEYUANJIAOSHOU、BOSHISHENGDAOSHI。TIANJINSHITEPINJIAOSHOU、FENLIMOYUMOGUOCHENGSHENGBUGONGJIANGUOJIAZHONGDIANSHIYANSHIXUESHUDAITOUREN、TIANJINSHIFENLIMOKEXUEYUJISHUGUOJILIANHEYANJIUZHONGXINFUZEREN、JIAOYUBUKEYANCHUANGXINTUANDUIFUZEREN、TIANJINSHI131CHUANGXINTUANDUIFUZEREN。GUOJIABAIQIANWANRENCAIGONGCHENGGUOJIAJIRENXUAN(GUOJIAYOUTUCHUGONGXIANZHONGQINGNIANZHUANJIA)、ZHONGGUOKEXUEYUANBAIRENJIHUA、ZHONGGUOFANGZHIXUESHUDAITOUREN。GUOJIKANWUJournal of Water Sustainability BIANJI(EDITOR)、Journal of Water Reuse and DesalinationGUOJIBIANWEI、《MOKEXUEYUJISHU》BIANWEI。Vice-Chairman of IWA China Task Force on Membrane Technology (GUOJISHUIXIEHUIMOJISHUZHUANJIAWEIYUANHUIZHONGGUOFENHUIFUZHUXI)。ZHUJIANG《MOKEXUEYUJISHU》、《CAILIAOZHIBEIGONGYIYUSHEJI》、《CAILIAOKEXUEDAOLUN》DENG。ZHANGQICONGSHIMIANXIANGSHUIZIYUANHUA、QINGJIENENGYUANJIQINGJIESHENGCHAN、SHENGWUZHIDENGGAOXIAOLIYONGYUZHUANHUAZHONGSUOSHEJIDELVSECUIHUA、MOFENLIKEXUEJICHUJIYINGYONGYANJIUHEXIANGGUANDEBENKESHENGHEYANJIUSHENGJIAOXUEGONGZUO。

ZHUYAONEIRONG:

Arsenic is a common, naturally occurring drinking water contaminant. Therein, inorganic arsenite (As (III)) with a higher toxicity than inorganic arsenate (As (V)) is hard to be removed by nanofiltration (NF). We proposed an integrated process of electrocatalytic membrane reactor and NF for the high efficiency removal of Arsenic. In particular, MnO2 nanowires were loaded on porous flat-sheet carbon membrane with pore size of 0.7 μm by the hydrothermal method to prepare a MnO2 NW/CM electrode, which was employed to constitute an electrocatalytic membrane reactor (ECMR) for the oxidation of NaAsO2 (As (III)) to NaH2AsO4•7H2O (As (V)). The concentration of NaAsO2 aqueous solution used was 10 mg/L. 15 g/L Na2SO4 was used as electrolytes. Results showed that the conversion rate of As (III) to As (V) was up to 96.0% under the ECMR operating with the pH value of 9.0, and current density of 0.4 mA cm−2 and residence time of 10 min. Interestingly, a commercial NF membrane was employed to filter the resultant permeate with 2 mg/L As (III) from ECMR. The arsenic rejection of NF was up to 99.5%. The concentration of Arsenic in the final result permeate was 9.5 µg/L, which is lower than World Health Organization (WHO) Guideline value for drinking water of 10 µg/L of Arsenic. In summary, our study provides a simple and efficient approach to remove Arsenic from the aquatic solution.

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