中药渣生物炭对磺胺甲基嘧啶的吸附及机理研究

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Abstract

Herb biochar was derived from Astragalus membranaceus residue at five different temperatures: 200℃, 400℃, 500℃, 600℃, and 700℃. The biochars were characterized by SEM, FTIR, and BET techniques. The effects of contact time, initial concentration, dosage, and pH of solution on the adsorption behaviors of the biochars were evaluated, and were preliminarily used to assess the adsorption mechanism of sulfamerazine by biochar. The results showed that surface area, pore volume, and sorption capacity of the biochars increased as the pyrolysis temperature increased. The S_BET values for the natural residue and BC700 were 0.42m²/g and 155.69m²/g, respectively. The S_BET and adsorption capacity were increased about 370-fold and 181-fold. The adsorption kinetics were found to be best represented by the pseudo-second-order kinetic model (R²>0.994). The isotherm sorption behavior is best described by the Langmuir model (R²=0.9977), and the maximum adsorption capacity was observed to be 11.96mg/g. Sulfamerazine adsorption by biochar first increased and then decreased with increasing dosage and pH; the optimum solution pH was 4.

Key words： biochar herb residue sulfamerazine adsorption

Received: 10 April 2016

PACS:

X703

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	Articles by authors
	HE Wen-ze
	HE Le-lin
	LI Wen-hong
	LIAO Qian-jia-hua
	SHANG Jing-ge

Cite this article:

HE Wen-ze,HE Le-lin,LI Wen-hong等. Adsorption of sulfamerazine from water by biochar derived from astragalus membranaceus residue[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3376-3382.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I11/3376

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