Different concentrations solutions of NaOH and NaCl were used to modify raw kaolin for improving its heavy metal capture performance. The best modified kaolin was formed by 0.19375 g NaOH modifying 10 g kaolin based on the evaluating index of capture efficiency with 4 and 47 increase for PbCl2 and CdCl2. This modified method can obtain a new adsorbent which has good capture effect on both PbCl2 and CdCl2 at the same time. Based on the evaluating index of the ratios of Pb/Al and Cd/Al, the best modified adsorbents on PbCl2 and CdCl2 were 10 g kaolin modified by 0.775 g NaOH and 10 g kaolin modified by 0.5675 g NaCl. The FTIR spectroscopy and specific surface areas of modified kaolin were measured. The adsorption products of modified kaolin were characterized by SEM, XRD. Leaching toxicity of adsorption products of modified kaolin was carried out and the modification mechanism was described.
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机译：采用不同浓度的NaOH和NaCl溶液对原料高岭土进行改性，提高其重金属捕获性能。根据捕获效率评价指标，0.19375 g NaOH改性10 g高岭土形成最佳改性高岭土，PbCl2和CdCl2分别提高了4 %和47%。该改进方法可以得到一种新的吸附剂，同时对PbCl2和CdCl2都有良好的捕获效果。根据Pb/Al和Cd/Al比值的评价指标，对PbCl2和CdCl2的最佳改性吸附剂为0.775 g NaOH改性的10 g高岭土和0.5675 g NaCl改性的10 g高岭土。测定了改性高岭土的傅里叶变换红外光谱和比表面积。采用SEM、XRD等手段对改性高岭土的吸附产物进行了表征。对改性高岭土吸附产物的浸出毒性进行了研究，并阐述了改性机理。
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