Al改性柠条生物炭对P的吸附特性及其机制

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Abstract In order to utilize the waste biomass resources efficiently, Caragana Korshinskii was selected as raw material to produce biochar at 650℃ for 3h by oxygen-limited pyrolysis, using Al modified caragana biochar by direct modification method, and the adsorptions of phosphate in aqueous solutions were evaluated. The effects of initial phosphate concentration and contact time in batch sorption experiments were investigated by the four kinds of isothermal adsorption model (Langmuir, Freundlich, Temkim, D-R model) and the four kinds of adsorption kinetics model (Pseudo first-order, Pseudo second-order, Elovich model, Intraparticle diffusion model), respectively. In addition, the adsorption properties of Al modified biochar on phosphate were investigated by the effects of isothermal adsorption, adsorption kinetics, pH and addition concentration, respectively. The influencing factors of adsorption characteristics about caragana biochar (NB) and Al modification caragana biochar (Al-NB) were discussed by characterized for their elemental composition, functional groups, surface area, surface morphology and scanning electron microscope. The results showed that the adsorption capacity of NB to phosphate was very low; however, when the optimum modification ratio of Al-NB was 0.2:1, the adsorption capacity reached the largest, which is 8.35 times higher than that of the unmodified NB. The adsorption kinetics was best fitted by the pseudo-first order model, while the isothermal adsorption was best described by Langmuir isotherms, indicating that the beneficial adsorption process was monolayer via the boundary diffusion. The adsorption equilibrium was reached in 24h, and the maximum adsorption capacity of reached 19.97mg/g. With the increase of Al-NB addition amount, the adsorption capacity of phosphate decreased and the removal rate gradually increasing. The best addition amount was 2.5g/L. The optimum pH was 4~10, and the adsorption capacity reached the largest when pH=7. After adsorption phosphate, the pH of the solution was leaned to the neutral range and had a certain buffer effect. The mechanism of phosphate adsorbed by Al-NB mainly includes:electrostatic attraction, ligand exchange (hydroxyl), anion exchange (NO₃^-), as well as the inner-sphere surface complex formation process. It was demonstrated that Al-NB could be considered as a promising material to immobilize phosphate in contaminated Eutrophication water.

Key words： biochar Caragana Korshinskii Al modification adsorption characteristics phosphate mechanism

Received: 16 October 2017

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Corresponding Authors: 郑纪勇,副研究员,zhjy@ms.iswc.ac.cn E-mail: zhjy@ms.iswc.ac.cn

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	WANG Tong-tong
	CUI Qing-liang
	WANG Li-li
	TAN Lian-shuai
	SUN Ceng-ceng
	ZHENG Ji-yong

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WANG Tong-tong,CUI Qing-liang,WANG Li-li等. Adsorption characteristics and mechanism of phosphate from aqueous solutions on Al modification biochar produced from Caragana Korshinskii[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2210-2222.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I6/2210

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