磁性生物炭对水体中对硝基苯酚的吸附特性

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Abstract

In order to obtain environmentally friendly adsorbent with magnetic separation and excellent adsorption characteristics, biochar (CSBC) was prepared from cotton straw, and magnetic cotton straw biochar (MCSBC) was prepared by co-precipitation method. CSBC and MCSBC were characterized by SEM, XRD, XPS, FTIR, VSM, and element analysis. The adsorption characteristics of PNP in aqueous solution using CSBC and MCSBC were investigated. The results showed that the pH value of the solution had a great influence on the adsorption of PNP by CSBC and MCSBC, and the adsorption capacity was greater under acidic conditions. Adsorption process of PNP by CSBC and MCSBC can be well fitted by the pseudo-second-order kinetic model. The adsorption process includes two stages:liquid film diffusion and intra-particle diffusion. Langmuir, Freundlich, and Sips models described the adsorption behavior well. The maximum adsorption capacity of CSBC and MCSBC for PNP were 44.54 and 48.94mg/g, respectively. The adsorption capacity of MCSBC was higher than that of the CSBC. Thermodynamic parameters indicated that the adsorption process of PNP onto CSBC and MCSBC was spontaneous with increased entropy and endothermic. The regeneration studies indicated that MCSBC kept 82% of its initial PNP adsorption capacity at the sixth adsorption/desorption cycle.

Key words： cotton straw biochar magnetic adsorption p-nitrophenol

Received: 10 May 2018

PACS:

X703.1

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	Articles by authors
	MA Feng-feng
	ZHAO Bao-wei
	DIAO Jing-ru
	JIANG Yu-feng

Cite this article:

MA Feng-feng,ZHAO Bao-wei,DIAO Jing-ru等. Adsorption characteristics of p-nitrophenol removal by magnetic biochar[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 170-178.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/170

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