| 向日葵根分泌物对黄壤吸附Cd^2＋行为的影响 |
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| 引用本文： | 张道勇,潘响亮,黄承玲.向日葵根分泌物对黄壤吸附Cd^2＋行为的影响[J].农业系统科学与综合研究,2009,25(4):406-409. |
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| 作者姓名： | 张道勇 潘响亮 黄承玲 |
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| 作者单位： | 1. 中国科学院新疆生态与地理研究所,新疆,乌鲁木齐,830011;中国科学院地球化学研究所环境地球化学国家重点实验室,贵州,贵阳,550002
2. 贵州大学林学院,贵州,贵阳,550025 |
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| 基金项目： | 中国科学院.百人计划"项目，中国科学院知识创新工程重要方向性项目，国家自然科学基金项目 |
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| 摘 要： | 从pH的影响、等温吸附、吸附动力学和热动力学4个方面研究了向日葵根分泌物对黄壤吸附Cd^2＋的行为的影响。随着pH的升高，黄壤对Cd^2＋的吸附量都升高，而且在pH为3～8的范围内，根分泌物的存在都减少了黄壤对Cd^2＋的吸附。不论有否根分泌物存在，Langmuir方程和Freundlich方程能满意地描述黄壤对Cd^2＋的等温吸附行为，黄壤对镉的吸附动力学符合拟二级速率方程，是一个墒减的放热的自发反应。向日葵根分泌物的存在抑制了黄壤对镉的吸附容量和吸附速率，并一定程度上降低了吸附过程的自发性。图4，表3，参11。
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| 关 键 词： | 根分泌物 镉 黄壤 吸附 |
Effects of Root Exudates from Helianthus annuus on Adsorption of Cd2+ on Yellow Earth |
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| ZHANG Dao-yong,PAN Xiang-liang,HUANG Cheng-ling.Effects of Root Exudates from Helianthus annuus on Adsorption of Cd2+ on Yellow Earth[J].System Sciemces and Comprehensive Studies In Agriculture,2009,25(4):406-409. |
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| Authors: | ZHANG Dao-yong PAN Xiang-liang HUANG Cheng-ling |
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| Institution: | ZHANG Dao-yong, PAN Xiang-liang, HUANG Cheng-ling( 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumuqi 830011, China; 2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China ; 3. Forestry College of Guizhou University, Guiyang 550025, China ) |
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| Abstract: | The effects of root exudates from Helianthus annuus on Cd~(2+) adsorption to yellow earth were investigated in the present study. It was found that root exudates generally inhibited adsorption of Cd~(2+) onto yellow earth. Cd~(2+) adsorption capacity increased on increasing of solution pH and the presence of root exudates reduced Cd~(2+) adsorption capacity at pH 3 - 8-Cd~(2+) isothermal adsorption could be well represented with both Langmuir and Freundlich equations, and the adsorption kinetics with pseudo-second order equation. Cd~(2+) adsorption capacity to yellow earth is a spontaneous exothermic reaction.The presence of root exudates reduced the adsorption capacity and adsorption rate. |
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| Keywords: | root exudates Cadmium yellow earth adsorption |
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