摘要
以强碱改性泥炭,研究改性泥炭对Pb~(2+)、Cd~(2+)的吸附效果及竞争吸附机制。结果表明,改性泥炭对Pb~(2+)、Cd~(2+)具有显著的吸附效果,吸附容量分别由118,64 mg/g提高到225,95 mg/g;FTIR分析表明,吸附过程为Pb~(2+)、Cd~(2+)与—OH、—COO-、C—H等官能团的络合作用或者离子交换作用。当吸附时间为70 min,pH在4~8,改性泥炭添加量分别为0.8,1.6 g/L时,可达到高效与经济双层效益。竞争吸附中,Pb~(2+)、Cd~(2+)的吸附容量均低于单一离子时的吸附容量,且竞争吸附能力Pb~(2+)>Cd~(2+)。
The alkali-modified peat was used as adsorbent to study the adsorption effect and competitive adsorption mechanism of Pb~(2+) and Cd~(2+) in solution.The results showed that the modified peat had a significant effect on Pb~(2+) and Cd~(2+),and the adsorption capacity increased from 118 mg/g and 64 mg/g to225 mg/g and 95 mg/g,respectively.FTIR analysis showed that the adsorption process was complexation or ion exchange between Pb~(2+),Cd~(2+) and —OH,—COO-,C—H.When the adsorption time was 70 min,the pH was 4~8,and the modified peat content was 0.8 g/L and 1.6 g/L respectively,the double-layer efficiency can be achieved.In the competitive adsorption,the adsorption capacities of Pb~(2+) and Cd~(2+) were lower than those in the presence of a single ion,and the competitive adsorption capacity was Pb~(2+)>Cd~(2+).
引文
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