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| Isothermal adsorption of cadmium and lead by brown calcareous soil colloids in a Karst Area |
| Received:October 09, 2019 |
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| KeyWord:Karst Area;colloid;cadmium;lead;isothermal adsorption |
| Author Name | Affiliation | E-mail | | ZHANG Rong-rong | College of Agriculture, Guangxi University, Nanning 530004, China | | | JIANG Dai-hua | College of Agriculture, Guangxi University, Nanning 530004, China | dhjiang2008@gxu.edu.cn | | SHI Ding-ding | College of Agriculture, Guangxi University, Nanning 530004, China | | | WANG Shi-jia | College of Agriculture, Guangxi University, Nanning 530004, China | |
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| Abstract: |
| We aimed to understand the adsorption characteristics of brown calcareous soil colloids on cadmium and lead ions in Karst Area. The brown calcareous soil in a Karst Area in Guangxi was sampled to extract soil colloids, which were used to evaluate the adsorption characteristics of cadmium and lead. The results revealed the following. In the Langmuir, Freundlich, and D-R isothermal models for the two heavy metal ions, the isothermal adsorption curve fit results were above 0.93. Compared with the mixed solution, the distribution coefficient in the single solution of lead and cadmium was increased by 0.81 and 0.30, respectively. After removing the organic matter, the adsorption capacity of cadmium by colloids decreased by 30%~46% and that of lead by 14%~25%. The affinity of colloids for lead was greater than that for cadmium. Cadmium was easily affected by lead in a mixed solution of metal ions. The removal of organic matter decreased the adsorption capacity of colloids. |
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