摘要
采用共沉淀方法合成了EDTA插层水滑石,在吸附剂投加量1.0 g/L、时间50 min、p H值6、温度50℃为插层水滑石吸附Cd2+的最佳条件下,分析了EDTA插层水滑石的解吸再生性能,进行了吸附动力学和吸附热力学研究,初步分析了EDTA插层水滑石吸附溶液中Cd2+的吸附机理。结果表明,硝酸溶液对吸附饱和的插层水滑石的解吸率较高;EDTA插层水滑石对溶液中Cd2+的吸附规律能更好的符合准二级动力学模型和Langmuir等温方程模型,该吸附为自发的、吸热的化学吸附且其对溶液中Cd2+的吸附主要是表面吸附机制和螯合机制的综合作用。
The study adopts the method of coprecipitation synthesis magnesium aluminum hydrotalcite and EDTA intercalated hydrotalcite,under the best adsorption conditions for EDTA adsorpted Cd2 +( p H: 6; time: 50min; temperature: 50 ℃;adsorbent additive amount: 1. 0 g / L) to analyze the EDTA desorption regeneration performance,studied the adsorption kinetics and adsorption thermodynamics,preliminary analysis of the EDTA intercalated hydrotalcite adsorption mechanism of the adsorption of Cd2 +. Results showd that desorption rate of EDTA intercalated hydrotalcite by nitric acid solution is higher;EDTA intercalated hydrotalcite regularity in the adsorption of Cd2 +in the solution can conform to the secondary dynamics model and the Langmuir isotherm equation model,the adsorption is spontaneous and endothermic chemical adsorption and it's mainly surface adsorption and chelating mechanism synthesis.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第S1期23-26,共4页
Environmental Engineering
基金
国家自然科学基金项目"纳米铁炭微电解体系去除地下水中硝酸盐的机理及应用研究"(41272266)
高等学校博士学科点专项科研基金项目"人工快速渗滤系统短程硝化反硝化机理及动力学研究"(20135122120020)
