秸秆生物炭对双氯芬酸钠的吸附性能研究

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Abstract Straw-biochar (SBC) was prepared by rice straw, a cheap agricultural waste, through activation with ammonium hydrogen phosphate ((NH₄)₂HPO₄). SBC was characterized by scanning electron microscopy (SEM), surface area measurements (BET) and Fourier transform infrared spectroscopy (FTIR). The effect of contact time, SBC dosage, initial pH and concentration of anions were investigated. The results indicated that adsorption capacity of SBC reached an equilibrium within 60min with 0.3g/L of SBC and 0.05mmol/L DCF. The removal rate of DCF decreased with pH increasing from 5.00 to 9.00. The addition of Cl^-、SO₄^2- and HCO₃^- had a negligible impact on the adsorption of DCF. The adsorption of diclofenac on SBC could be well fitted by the pseudo-second-order kinetics and Freundlich isotherm model. The maximum adsorption capacity of SBC for DCF was calculated to be 277.78mg/g based on Langmuir isotherm model. Thermodynamic parameters illustrated that the adsorption process was spontaneous and endothermic. Compared with activated carbon (AC) and carbon nanotube (CNT), SAC achieved a better performance on the removal of DCF.

Key words： adsorption straw-biochar diclofenac kinetics thermodynamics

Received: 07 August 2018

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X522

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	Articles by authors
	XIA Wen-jun
	XU Jie
	LIU Feng
	HUANG Tian-yin
	WANG Zhong-mimg
	CHEN Jia-bin

Cite this article:

XIA Wen-jun,XU Jie,LIU Feng等. Adsorption of diclofenac on straw-biochar[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1054-1060.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1054

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