Position: Home > Articles > Study on the modification of humic acid and its adsorption to cadmium
Journal of Nanjing Forestry University(Natural Sciences Edition)
2014,38
(4)
102-106
腐殖酸改性及其对镉的吸附特性
作 者：
陈荣平;张银龙;马爱军;蒋为民
单 位：
南京林业大学化学工程学院;江苏农林职业技术学院;南京林业大学森林资源与环境学院
关键词：
腐殖酸改性;吸附特性;镉;重金属废水
摘 要：
对腐殖酸改性前后表面理化性质的改变及其对水中镉离子的吸附性能进行了研究。结果表明,改性后腐殖酸比表面积和孔结构均有明显改善,吸附能力增强。吸附实验结果表明:随着pH的增大,改性后腐殖酸对镉离子的吸附量增加,在pH约为6时,吸附效率达到最大并趋于稳定;改性后腐殖酸对镉离子的吸附最高可达20mg/g,吸附等温线用Langmuir模型拟合最佳。吸附再生实验表明,改性腐殖酸吸附剂具有不易损失、易再生的特点,可以循环使用。
译 名：
Study on the modification of humic acid and its adsorption to cadmium
作 者：
CHEN Rongping;ZHANG Yinlong;MA Aijun;JIANG Weimin;College of Chemistry Engineering,Nanjing Forestry University;College of Forest Resources and Environment,Nanjing Forestry University;Jiangsu Polytechnic College of Agriculture and Forestry;
关键词：
humic acid modification;;adsorption;;cadmium;;heavy metal waste water
摘 要：
Variation of the surface physical-chemical properties of humic acid( HA) before and after modification and their adsorption properties for Cd2 +in water were investigated. The adsorption behaviors of modified HA on Cd2 +were also examined under various experimental conditions. It was observed that the surface textural properties of modified HA were improved,which was in favour of adsorption. The fundamental adsorption experiments revealed that the modified HA was more efficient for Cd2 +removal when initial solution pH was about 6. The theoretical maximal adsorption capacity is about 20 mg /g. Which is based on the simulation results from the isothermal equilibrium study. The adsorption equilibrium behaviors were in accordance with Langmuir model. Furthermore,the modified HA adsorbent could be easily regenerated and reused with almost no loss of adsorption capacity,which would be satisfactory for practical applications.
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