包覆型纳米零价铁去除水中镍(II)离子和三氯乙烯的研究

Abstract

包覆型纳米零价铁去除镍(II)离子和三氯乙烯(TCE)的结果表明：Ni2+和TCE的去除率均随着包覆型纳米零价铁的投加量增加而升高，随着溶液初始浓度的增加而降低。四种零价铁材料处理混合废水的能力依次为：NZVI < Agar-NZVI < CMC-NZVI < Starch-NZVI，包裹剂Agar、CMC、Starch对目标污染物的作用可以忽略。在混合废水中Ni2+和TCE浓度都为5 mg/L，包覆型纳米零价铁的加入量为1.5 g/L，温度为30℃，反应时间为2.5 h，Starch-NZVI对Ni2+和TCE的处理效果最好，其中Ni2+的去除率为99.38%，TCE的脱氯率为49.36%。 Coated nano zero-valent iron removal of Nickel (II) ions and trichloroethylene (TCE) results showed that: The removal of nickel ions and TCE was better with higher dosage of nano zero-valent iron and lower initial concentration. Capacity of four kinds of zero-valent iron material handling wastewater was: NZVI < Agar-NZVI < CMC-NZVI < Starch-NZVI; effect of wrapped agent act on pollutants could be ignored. When Nickel (II) and TCE concentrations were 5 mg/L in the mixed wastewater, amount of Starch-NZVI was 1.5 g/L; temperature was 30˚C; reaction time was 2.5 h; Nickel (II)+ and TCE had best treatment effect, with Nickel (II) removal rate 99.38%, TCE degradation rate 49.36%.