环丙沙星在黄土中的吸附机制及影响因素

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Abstract

In order to study the adsorption behavior and mechanism of veterinary antibiotics on the loess of Northwest China, ciprofloxacin was selected as the target pollutant, and batch equilibrium method was conducted to investigate its adsorption kinetics, adsorption thermodynamics, and influencing fators, such as pH values and particle sizes, on the adsorption process. Results showed that the adsorption of ciprofloxacin on loess can be divided into two stages:fast adsorption stage (0~6h) and slow adsorption stage (6~10h), and adsorption equilibrium was reached after 10 hours. The adsorption processes fitted well with the pseudo-second-order adsorption kinetics model, and the adsorption rate was controlled by both the internal diffusion of particles and the external diffusion of liquid membrane. The adsorption thermodynamics process was in accordance with the Freundlich model, and the isotherm adsorption was belonged to L-type, which means the adsorption behaviour was affected by the interaction of solute and water molecules in solution. The changes of Enthalpy (ΔH^θ), Entropy (ΔS^θ) and Gibbs free energy (ΔG^θ) were all less than 0, indicated that the adsorption was a spontaneous exothermic reaction with a decrease of chaotic degree. The maximum adsorption amount of ciprofloxacin on loess was obtained at 5 of pH value, and the adsorption of ciprofloxacin on loess increased with the increase of pH value from 2 to 5. While, the adsorption of ciprofloxacin on loess decreased with the increase of pH value beyond 5, thus, strong acid and alkaline environment were unfavorable to adsorption. The adsorption amount of ciprofloxacin on loess was inversely proportional to the size of loess, and was proportional to the initial concentration as well. According to the experimental results, it was inferred that the adsorption of ciprofloxacin on loess was mainly related to the content of organic matter, and the adsorption mechanism was dominated by the cation exchange of amino groups in ciprofloxacin molecule.

Key words： loess ciprofloxacin kinetic adsorption thermodynamic adsorption influencing factors

Received: 03 April 2019

PACS:

X131.3

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	Articles by authors
	JIANG Yu-feng
	WEN Hong
	ZHANG Qian
	LIU Lan-lan
	YUAN Long-miao
	FU Xue

Cite this article:

JIANG Yu-feng,WEN Hong,ZHANG Qian等. Adsorption mechanism and influencing factors of ciprofloxacin on loess[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4262-4269.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I10/4262

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