酸性紫色水稻土颗粒有机质对镉的吸附特性

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Abstract

Characteristics of cadmium ion (Cd²⁺) adsorption on particulate organic matter (POM) isolated from a typical acid purple paddy soil were investigated by means of scanning electron microscopy-energy dispersive spectrometer (EDS), fourier transform infrared spectroscopy (FTIR), and the fractionation of Cd²⁺ in POM before and after adsorption. The affinity of Cd²⁺ to POM was much higher than that to the original soil. The adsorption kinetic data could be well described by the pseudo-secondary order equation. The Freundlich equation was better than Langmuir model in describing Cd²⁺ adsorption isotherm of POM, indicating that the adsorption of Cd²⁺ on POM was a heterogeneous multi-molecular layer adsorption. The negative Gibbs free energy (DG^θ), and the positive Entropy (DH^θ) and Enthalpy (DS^θ) illustrated that the adsorption was a spontaneous endothermic process. The value of DH^θand the desorption rate of adsorbed Cd²⁺ indicated that Cd²⁺ was bond to POM primarily through chemical reactions, while to the original soil it did mainly through physical forces. The fractionation showed that the adsorption process increased the percentage of exchangeable Cd²⁺ in the original soil and the percentage of exchangeable and complex forms in POM. The above results together with the analysis of EDS and the FTIR spectra revealed that the mechanisms of Cd²⁺adsorption on POM included complexation of oxygen-containing functional groups, ion exchange, cation-π bonding, precipitation and electrostatic adsorption.

Key words： acidic purple paddy soil particulate organic matter cadmium adsorption desorption

Received: 12 February 2019

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X53

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	Articles by authors
	ZHANG Lan-ping
	MIN Wen-hao
	FAN Zhi-qiang
	ZHAO Xiu-lan
	WEI Shi-qiang

Cite this article:

ZHANG Lan-ping,MIN Wen-hao,FAN Zhi-qiang等. Characteristics of cadmium adsorption on particulate organic matter isolated from an acidic purple paddy soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2588-2597.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I6/2588

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