玉米芯活性炭的制备及对水中Cr(Ⅵ)的去除

Preparation of corncob activated carbon and the removal of Cr(Ⅵ) from water

采取H_3PO_4活化制备玉米芯活性炭(CCAC)及玉米秸秆活性炭(CSAC),并对水中Cr(Ⅵ)进行去除。CCAC的最佳制备条件:取玉米芯10 g,按玉米芯与H_3PO_4质量比为1∶2投加H_3PO_4,同时投加5%H_3BO_310 m L,浸渍45 min,焙烧温度500℃,焙烧时间1 h。用CCAC和CSAC处理10 mg/L的Cr(Ⅵ)溶液,出水符合《生活饮用水卫生标准》(GB5749—2006)和《城镇污水处理厂污染物排放标准》(GB 18918—2002)。BET和SEM分析表明CCAC表面有较多孔洞结构,CCAC的孔隙最发达,CSAC次之,CAC最少。

Corncob activated carbon（CCAC） and corn straw activated carbon （CSAC） have been prepared by H3PO4 activation method, and the removal of Cr（Ⅵ ） in water has been implemented. The results show that the optimum conditions for CCAC preparation are as follows：the mass of corncob is 10 g, adding H3PO4 under conditions of re（corncob）： m （H3PO4） 1：2, dipping time 45 rain in 10 mL 5% H3BO3, sintering temperature 500℃, sintering time 1 h. 10 mg/L of Cr （ Ⅵ） solution is to be treated with CCAC and CSAC. Thus,the effluent complies with the Standard for Drinking Water Quality （GB 5749-2006） and Discharge Standards of Pollutants for Municipal Wastewater Treatment Plants （CB 18918-2002）. BET and SEM results indicate that C CAC surfaces have comparatively more porous structures, CCAC holes are the most developed, CSAC surfaces have less and CAC surfaces have the least.