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
李建新，男，湖北武漢市人，南非斯坦陵布什大學博士、天津工業大學材料科學與工程學院教授、博士生導師。天津市特聘教授、分離膜與膜過程省部共建國家重點實驗室學術帶頭人、天津市分離膜科學與技術國際聯合研究中心負責人、教育部科研創新團隊負責人、天津市131創新團隊負責人。國家百千萬人才工程國家級人選（國家有突出貢獻中青年專家）、中國科學院百人計劃、中國紡織學術帶頭人。國際刊物Journal of Water Sustainability 編輯（EDITOR）、Journal of Water Reuse and Desalination國際編委、《膜科學與技術》編委。Vice-Chairman of IWA China Task Force on Membrane Technology （國際水協會膜技術專家委員會中國分會副主席）。主講《膜科學與技術》、《材料制備工藝與設計》、《材料科學導論》等。長期從事面向水資源化、清潔能源及清潔生產、生物質等高效利用與轉化中所涉及的綠色催化、膜分離科學基礎及應用研究和相關的本科生和研究生教學工作。
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.