化学老化对Zn改性生物炭性质及吸附Pb<sup>2+</sup>的影响

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Abstract In this paper, ZnSO₄-impregnated biochar (PRZn) was subjected to high temperature (60℃ and 90℃) abiotic aging for six months. The characteristics of biochar properties after aging were determined by elemental analyzer, specific surface area analyzer, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The effect of aging on the adsorption performance of Pb²⁺ was comparatively studied with aged biochars and pristine biochars. The results indicated the free radicals (methyl radicals) generated by high temperature aging process led to the increasing of oxygen-containing functional groups content on the surface of biochars. The specific surface area of biochars pyrolyzed under 500℃ was greatly increased after aging (from 24.67m²/g to 85.51m²/g), while Zn oxides introduced from modification process were transformed from crystal structures to organic bound forms. The adsorption capacity of Pb²⁺ was increased from 31.18mg/g to 47.70mg/gbecause of aging processes. However, a slight decrease of oxygen functional groups and Pb²⁺ adsorption capacity (36.05mg/gdecreased to 31.92mg/g) was observed for biochars pyrolyzed under 700℃ after ageing at high temperature (90℃), mainly because a self-quenching effect of reactive substances at high ageing temperature and a stable structure for biochar pyrolyzed at 700℃. Findings of this study can provide new insights to the long-term utilization of modified biochar in lead-contaminated soil.

Key words： Zn modified biochars adsorption of Pb²⁺ abiotic aging long-term utilization free radicals

Received: 30 June 2023

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	Articles by authors
	WU Yu-qian
	HAN Lin-xi
	QIAN Min
	ZHU Zi-yang
	WANG Li
	DUAN Wen-yan
	CHEN Fang-yuan

Cite this article:

WU Yu-qian,HAN Lin-xi,QIAN Min等. Effects of chemical aging on the properties of Zn-modified biochars and the adsorption properties of Pb²⁺[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 803-813.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I2/803

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