碱改性小麦秸秆生物炭对水中四环素的吸附性能

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Abstract The wheat straw biochar (WBC) was prepared through carbonization for 6 hours at pyrolyzing temperatures of 873K; and three alkali-modified WBCK (WBCK1, WBCK2, and WBCK3) with different KOH-char mass ratios (1:1, 2:1, and 3:1) were subsequently prepared with KOH impregnation modification. The structure characteristics and surface properties of WBCK were characterized with scanning electron microscopy (SEM), specific surface area and porosity analyzer (SSAP), and Fourier transform infrared spectrometer (FT-IR). Batch adsorption experiments were carried out to evaluate the adsorption performance of tetracycline (TC) onto WBCK. Compared to WBC, WBCK possessed a richer pore structure and a higher specific surface area. The adsorption capacities of TC by WBCK were significantly enhanced. The adsorption of TC by WBCK followed the pseudo-second-order kinetics model, and the adsorption rate constants were in the order of k_2(WBCK2) > k_2(WBCK3) > k_2(WBCK1). The adsorption capacities of TC by WBCK increased with an increase in temperature, and the physical adsorption and chemical adsorption coexisted in the adsorption process. Langmuir, Freundlich, and Temkin model could describe the adsorption isotherm perfectly, implying that the adsorption mechanism is complicated. The adsorption of TC by WBCK was a spontaneous endothermic process with entropy increment. WBCK had good adsorption performance for TC in the solution pH range of 4.0 to 8.0. WBCK1, WBCK2, and WBCK3 had good reusability, especially, the adsorption removal efficiency of WBCK2 decreased by only 13.9% after five cycles.

Key words： wheat straw biochar KOH modification tetracycline adsorption

Received: 09 January 2022

PACS:

X703

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	Articles by authors
	LIU Zong-tang
	SHAO Jiang
	LI Yan
	WU Yan-ru
	AN Yan
	SUN Yu-feng
	FEI Zheng-hao

Cite this article:

LIU Zong-tang,SHAO Jiang,LI Yan等. Adsorption performance of tetracycline in water by alkali-modified wheat straw biochars[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3736-3743.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3736

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