酸化赤泥吸附环丙沙星的特征、机理及过程优化

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Abstract In this paper, the adsorption conditions, characteristic and mechanism of ciprofloxacin on the acidified red mud were studied. A four-factor and three-level optimization model based on Box-Behnken design method was established to determine the optimum adsorption condition, and adsorption temperature, solution pH, ciprofloxacin initial concentration and acidified red mud dosage were as arguments and adsorption capacity as the response value. The kinetic model, isotherm model, thermodynamic property and mechanism of the adsorption process were discussed as well. The results showed that solution pH, ciprofloxacin initial concentration, acidified red mud dosage had significant effect on the adsorption process. The predicted maximum adsorption reached 7.30mg/g under the optimized conditions of 45℃, pH 3.04, ciprofloxacin initial concentration of 29.20mg/L, and acidified red mud dosage 3.40g/L. The adsorption was well fitted the pseudo-second-order reaction kinetics and Langmuir-Freundilich isotherm model, with the maximum adsorption capacity were 7.90 and 7.35mg/g, respectively. ΔG⁰, ΔS⁰ and ΔH⁰ were calculated by Van Tehoff equation as -82.13~94.37kJ/mol, 0.61J/(mol·K) and 100.25kJ/mol, respectively. Ciprofloxacin adsorption on acidified red mud was a spontaneous endothermic process. Infrared spectrum showed that the complexation between carboxylate group of ciprofloxacin and Al-O bond of acidified red mud, and the weak electrostatic or inner-sphere bonding between keto group in ciprofloxacin and Fe-O in acidified red mud were attributed to the adsorption. This study showed that acidified red mud is a potentially low-cost absorbent for the treatment of antibiotic-contaminated wastewater.

Key words： acidified red mud ciprofloxacin response surface optimization adsorption kinetics adsorption thermodynamics

Received: 19 April 2019

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X703

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	SHI Jing-zhuan
	WEI Hong
	ZHOU Xiao-de
	SHI Ying-juan
	ZHENG Jia-xin

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SHI Jing-zhuan,WEI Hong,ZHOU Xiao-de等. Adsorption of ciprofloxacin by acidified red mud: characteristic, mechanism and process optimization[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4689-4696.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4689

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