基于纳米活性白土的大比表面积和吸附特性,有效地解决了废水中锰(Ⅱ)的分离和预富集,对纳米活性白土的吸附性能作了较全面的研究.结果表明:在最佳试验条件下,当活性白土的用量为0.020 g时,其静态饱和吸附容量为6.13 mg·g-1;当在pH 4的含锰(Ⅱ)溶液中用0.500 g活性白土与之振摇5 min,随后令其静置6 h,锰的回收率达92%以上.吸附在纳米活性白土上的锰(Ⅱ)可用0.5 mol·L-1盐酸溶液25 mL与之振摇3 min并静置3 h使其解吸,解吸的回收率达95%以上.解吸溶液中的锰(Ⅱ)用火焰原子吸收光谱法测定,所提出的方法已用于磷化工艺的废水样中锰的测定,所得方法的检出限(3σ)、相对标准偏差(n=11)及回收率的数据依次为0.002 3 mg·L-1,1.0%及92.5%~99.0%范围内.

Manganese(Ⅱ) in waste water was effectively separated and preconcentrated by adsorption on powdered nano-attapulgite based on its predominant specific surface and adsorption characteristics.Adsorption behavior of the nano-attapulgite towand manganese(Ⅱ) were studied in detail.It was found that under optimum condition,static saturated adsorption capacity tested on the base of 0.020 g nano-attapulgite was found to be 6.13 mg·g-1;and a recovery of over 92% was achieved when manganese(Ⅱ) in a solution of pH 4 was shaked with 0.500 g of nano-attapulgite for 5 min and stayed for 6 h.Manganese on the attapulgite was desorbed with 25 mL of 0.5 mol·L-1 HCl by shaking for 3 min and staying for 3 h.Values of recovery of the desorption process found were above 95%.Desorbed manganese(Ⅱ) in hydrochloric acid was determined by FAAS.The proposed method was applied to the determination of manganese in waste water samples from phosphorizing process,giving values of detection limit (3σ),RSD′s (n=11) and recovery of 0.002 3 mg·L-1,1.0% and in the range of 92.5% to 99.0% respectively.