黄河兰州段底泥对硝基苯的吸附行为

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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

Received: 22 July 2016

PACS:

X53

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	Articles by authors
	WANG Xing-rong
	JIANG Yu-feng
	WANG Zheng
	SUN Hang
	MU Zhong-feng
	ZHAN Hui-ying

Cite this article:

WANG Xing-rong,JIANG Yu-feng,WANG Zheng等. Adsorption behavior of nitrobenzene onto sediment in Lanzhou section of the Yellow River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(4): 1523-1529.

URL:

http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I4/1523

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