黄河兰州段底泥对硝基苯的吸附行为

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摘要

选择硝基苯为代表性污染物，研究了黄河兰州段底泥对硝基苯的动力学吸附和热力学吸附过程，并对离子强度、pH值和粒径等对吸附的影响进行了分析.结果表明，硝基苯在黄河兰州段底泥上的动力学吸附经历了3个阶段：快速、慢速和吸附平衡阶段，0~2h为快速吸附阶段，2~15h为慢吸附阶段，15h后吸附达到平衡.黄河兰州段底泥对硝基苯的动力学吸附过程较好地符合准二级吸附动力学模型；热力学吸附较好地符合Langmuir等温吸附模型；在吸附过程中，吸附自由能ΔG^θ小于0，焓变ΔH^θ及熵变ΔS^θ均大于0，表明黄河兰州段底泥对硝基苯的吸附是一个自发吸热且吸附体系的混乱度增大的等温吸附过程.吸附影响因素分析结果显示：当Ca²⁺离子浓度在0~0.05mol/L时，黄河兰州段底泥对硝基苯的吸附量随Ca²⁺离子浓度的增大而增加，当Ca²⁺离子浓度增大到0.1mol/L时，吸附量减少，说明在此离子强度下，Ca²⁺抑制了底泥对硝基苯的吸附.当pH3~5和7~10范围内时，底泥对硝基苯的吸附量随pH值增大明显减小，当pH5~7范围内时，吸附量随pH值增大基本保持不变.底泥粒径对黄河兰州段底泥吸附硝基苯有显著影响，其饱和吸附量随底泥粒径的减小而增大.

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	王兴荣
	蒋煜峰
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	慕仲锋
	展惠英

关键词 ：硝基苯, 黄河, 底泥, 吸附动力学, 吸附热力学, 影响因素

Abstract：

The primary objective of this study was to investigate the adsorption kinetics and thermodynamics of nitrobenzene onto sediment in Lanzhou section of the Yellow River. Meanwhile, the effective factors, such as ionic strength, pH values and the different particle sizes of sediment, were also conducted to characterize the adsorption process. The results showed that the adsorption of nitrobenzene onto sediment in Lanzhou section of the Yellow River has experienced three processes: high-speed adsorption process, deceleration and adsorption equilibrium process. The adsorption equilibrium was reached within 15h. The adsorption of nitrobenzene onto sediment in Lanzhou of the Yellow River could be better described by the pseudo-second-order kinetic model; the adsorption thermodynamics of nitrobenzene onto sediment is fitted well with the Langmuir isothermal model. Thermodynamics parameters such as the change of free energy, enthalpy and entropy were also evaluated for the adsorption of nitrobenzene onto sediment. The results indicate a spontaneous endothermic and an increase of the chaos in adsorption process. Analysis results of adsorption showed when the concentration of Ca²⁺ was in a range of 0~0.05mol/L, adsorption of nitrobenzene onto sediment increased with the increase of Ca²⁺ concentration, however, when the concentration of Ca²⁺ increased from 0.05 to 0.1mol/L, the adsorption capacity decreased, because the presence of Ca²⁺ inhibited the adsorption of nitrobenzene onto sediment. The pH values and the different particle sizes of sediment have obvious effect on adsorption of nitrobenzene onto sediment. When the pH was in a range of 3~5 and 7~10, the adsorption capacity of nitrobenzene on sediments significantly decreased with the increase of pH, while pH was in a range of 5~7, the adsorption capacity remained unchanged with the increase of pH. The particle size of sediment in Lanzhou section of the Yellow River has significant effect on the adsorption capacity of nitrobenzene, which increase with decrease of the particle size of the sediment.

Key words： nitrobenzene The Yellow River sediment adsorption kinetics adsorption thermodynamics influencing factors

收稿日期: 2016-07-22

PACS:

X53

基金资助:

国家自然科学基金项目（41363008，21067005，41272147）

通讯作者: 蒋煜峰,副教授,jiangyf7712@126.com E-mail: jiangyf7712@126.com

作者简介: 王兴荣(1992-),女,甘肃金昌人,兰州交通大学硕士研究生,主要研究方向为水污染与控制工程.

引用本文:

王兴荣, 蒋煜峰, 王拯, 孙航, 慕仲锋, 展惠英. 黄河兰州段底泥对硝基苯的吸附行为[J]. 中国环境科学, 2017, 37(4): 1523-1529. WANG Xing-rong, JIANG Yu-feng, WANG Zheng, SUN Hang, MU Zhong-feng, ZHAN Hui-ying. Adsorption behavior of nitrobenzene onto sediment in Lanzhou section of the Yellow River. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(4): 1523-1529.

链接本文:

http://manu36.magtech.com.cn/Jweb_zghjkx/CN/ 或 http://manu36.magtech.com.cn/Jweb_zghjkx/CN/Y2017/V37/I4/1523

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