纤铁矿对氧氟沙星的吸附特征及环境影响因素

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Abstract In this paper, the kinetics and thermodynamic process of adsorption of typical fluoroquinolone antibiotic of ofloxacin (OFL) on lepidocrocite and its environmental influencing factors were investigated by chemically synthesized lepidocrocite. The results showed that, the adsorption process of OFL on lepidocrocite was more fitted with the pseudo-second-order kinetic model (R²=0.991) and the Freundlich model (R²=0.996). The equilibrium adsorption capacities (Q_e) was 1.99mg/g and the reaction is spontaneous and exothermic. The adsorption of OFL by lepidocrocite is strongly pH dependent, which mainly depends on the charged nature of lepidocrocite and the existence form of OFL ions under different pH conditions; the increase of ionic strength will weaken the electrostatic repulsion between lepidocrocite and OFL, which will lead to an increase of adsorption. The adsorption of OFL on lepidocrocite was promoted by fulvic acid (FA); The two coexisting ions have different effects on the competitive adsorption of OFL. Ca²⁺ inhibits the adsorption of OFL, while NO₃^- has no significant effect. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) showed that the adsorption mechanism of OFL adsorption on lepidocrocite was dominated by bidentate chelate coordination or double-bridge coordination with the participation of carboxyl groups.

Key words： lepidocrocite ofloxacin (OFL) adsorption mechanism influencing factors coordination

Received: 02 November 2022

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X703

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	GAN Cui
	LI Yu-qiong
	ZHANG Tian-lun
	TONG Lei

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GAN Cui,LI Yu-qiong,ZHANG Tian-lun等. Adsorption characteristics and environmental factors of lepidocrocite to ofloxacin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2881-2888.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2881

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