| 四氯联苯在草木灰上的吸附/解吸特征及吸附动力学研究 |
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| 引用本文： | 毛世慧,郭新超,周岩梅,刘杨,杨永哲,郭光伟.四氯联苯在草木灰上的吸附/解吸特征及吸附动力学研究[J].环境科学与技术,2013(6):42-46. |
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| 作者姓名： | 毛世慧 郭新超 周岩梅 刘杨 杨永哲 郭光伟 |
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| 作者单位： | 西安建筑科技大学环境与市政工程学院;北京交通大学土木建筑工程学院市政与环境工程系 |
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| 基金项目： | 国家自然科学基金:PBTC在炭质吸附剂上的吸附特征及其生物可利用性变化机制(20977006) |
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| 摘 要： | 测定分析了草木灰的孔隙结构、表面性质及化学组成,研究了PCB52在草木灰上的吸附动力学、吸附等温线及解吸等温线的特征,结果表明Freundlich方程和二级动力学方程具有较高的拟合相关系数,说明吸附可能是复杂的多层吸附过程,且明显分为快速吸附和慢速吸附2个过程。解吸等温线呈现出非线性,且有一定的滞后性。随着草木灰浓度的增加HI值减小,即解吸滞后程度减小,且在高平衡浓度的条件下表现出更小的HI值,说明其更容易从吸附剂上解吸下来。
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| 关 键 词： | 草木灰 四氯联苯 动力学 吸附量 解吸 |
Sorption Kinetics and Adsorption/Desorption of Tetraachlorobiphenyl onto Plant Ash |
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| MAO Shi-hui,GUO Xin-chao,ZHOU Yan-mei,LIU Yang,YANG Yong-zhe,GUO Guang-wei.Sorption Kinetics and Adsorption/Desorption of Tetraachlorobiphenyl onto Plant Ash[J].Environmental Science and Technology,2013(6):42-46. |
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| Authors: | MAO Shi-hui GUO Xin-chao ZHOU Yan-mei LIU Yang YANG Yong-zhe GUO Guang-wei |
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| Institution: | 1(1.School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;2.Department of Municipal and Environmental Engineering,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | Pore structure,surface property and chemical constitution of plant ash were determined and analyzed.Sorption kinetics and adsorption/desorption isotherm of PCB52 on plant ash were examined respectively,and results demonstrated that Freundich equation and second-order equation fit best with the highest regression coefficients,implying that sorption may be a complex multi-layer adsorption,and were divided into fast and slow sorption stage.The desorption isotherms presented nonlinear,and desorption process showed some of the lag phenomenon.With increase of plant ash concentration,HI value were reduced,i.e.desorption lag were reduced,and smaller HI value were showed in the higher concentration conditions,which indicated that the adsorbents were desorbed from the sediments much easier in higher concentration conditions. |
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| Keywords: | plant ash PCB52 dynamics adsorption capacity desorption |
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