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乙二胺四乙酸插层水滑石吸附Cd(Ⅱ)的影响因素研究
RESEARCH ON ADSORPTION OF Cd( Ⅱ) BY EDTA INTERCALATED HYDROTALCITE
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摘要: 采用共沉淀的方法合成了镁铝水滑石和EDTA插层水滑石,并对两者进行表征分析,同时比较分析了EDTA插层水滑石和镁铝水滑石对Cd2+的吸附效果及影响因素,确定了合成高吸附容量的EDTA插层水滑石的最佳条件和其吸附镉的最佳吸附条件。结果表明:p H值为12、晶化时间为1 h和水浴温度为50℃是插层水滑石最佳合成条件;吸附剂投加量为1.0 g/L、时间为50 min、p H值为6、温度为50℃是插层水滑石吸附Cd2+的最佳条件。Abstract: Adopting the method of coprecipitation，magnesium aluminum hydrotalcite and EDTA intercalated hydrotalcite was compounded． The paper compared and analyzed EDTA intercalated hydrotalcite and magnesium aluminum hydrotalcite on the adsorption of Cd2 + and influence factors，obtained the best synthesis conditions of EDTA intercalated hydrotalcite and the best adsorption conditions． Results showed that the best synthesis conditions of EDTA intercalated hydrotalcite were: pH of 6，time of 1h， temperature of 50 ℃ and the best adsorption conditions were: Adsorbent additive amounts of 1. 0 g /L，time of 50 min， pH of 6，temperature of 50 ℃．
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