秸秆焚烧物对黄土吸附五氯酚的影响研究

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Abstract In order to study the adsorption of environmental endocrine disrupters onto loess soil affected by adding straw burning residual, pentachlorophenol (PCP) was selected as the target pollutant, to explore the adsorption kinetics, desorption kinetics, adsorption thermodynamics, and influence factors, such as particle size, initial concentration, ionic strength, pH values, by batch adsorption experiments. The results showed that the present of burning residual could promote the adsorption amounts of PCP on loess soil, and adsorption kinetics was fitted well with Pseudo-second-order model. The adsorption thermodynamics was more in line with the Freundlich adsorption model, and the adsorption isotherm conformed to the C-type. At the temperature range of 25~45, the average adsorption free energy (E) of PCP℃ onto loess soil was less than 8kJ/mol, which indicates physical adsorption in the adsorption process. The adsorption free energy, such as Gibbs free energy, enthalpy and entropy were all less than zero, demonstrating a spontaneous adsorption process and the chaos degree of the system decreased. When the pH value between 3 and 7, the adsorption capacity of PCP decreased with the increase of pH values, and it was increase when the pH value between 7and 10. The adsorption capacity of PCP onto loess increased with the decrease of soil particle sizes. The adsorption capacity of PCP was increased with ion strength at the same ions situation, and when the concentration of ions is equal, the adsorption increases with the increase of the ion valence state.

Key words： loess soil straw buring PCP adsorption kinetics desorption kinetics adsorption thermodynamics influence factors

Received: 25 October 2017

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	Articles by authors
	JIANG Yu-feng
	LIU Lan-lan
	YUAN Long-miao
	SHI Lei-ping
	MU Zhong-feng
	DIAO Jing-ru
	ZHAN Hui-ying
	WU Ying-qin

Cite this article:

JIANG Yu-feng,LIU Lan-lan,YUAN Long-miao等. Adsorption of PCP onto loess soil affected by adding corn burning residual[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1826-1836.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1826

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