研究论文
周敏,王树伦,陈俊辉,陶钧,陈慧,杜新贞.恩诺沙星在含水氧化铝和含水氧化铁上的配位吸附及配位增溶效应[J].环境科学学报,2012,32(2):425-431
恩诺沙星在含水氧化铝和含水氧化铁上的配位吸附及配位增溶效应
- Surface complexation sorption and ligand-promoted dissolution of enrofloxacin on aluminum hydroxide and iron hydroxide
- 基金项目：甘肃省自然科学基金项目(No.1010RJZA017)
- 作者
- 单位
- 周敏
- 西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州 730070
- 王树伦
- 西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州 730070
- 陈俊辉
- 西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州 730070
- 陶钧
- 兰州市第五十五中学, 兰州 730050
- 陈慧
- 西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州 730070
- 杜新贞
- 西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州 730070
- 摘要：采用批平衡试验方法,研究了恩诺沙星(ENR)在含水氧化铝(HAO)和含水氧化铁(HFO)上的吸附行为.结果表明,恩诺沙星在两类不同含水氧化物上的吸附可以用Langmuir等温方程描述,其中,吸附平衡常数KL (HFO) > KL (HAO).当溶液中NaCl的浓度在0.01~0.50 mol·L-1之间时,恩诺沙星的最大吸附量随着溶液离子强度的增大呈下降趋势,但吸附低浓度的恩诺沙星时,离子强度对吸附量的影响不大,表明此时两类含水氧化物对恩诺沙星的吸附均以配位反应为主.实验还发现,在较强的酸性或碱性环境中,恩诺沙星的吸附量都明显减小,配位吸附主要发生在pH为5~8的范围内,配位点主要发生在C-3羧基的位点上,形成ENR∶M (金属离子) =1∶1型的配合物,同时生成的表面配合物促进了恩诺沙星的溶解.
- Abstract：Batch equilibrium experiments were used to reveal enrofloxacin (ENR) adsorption on two different hydrous oxides: aluminum hydroxide (HAO) and iron hydroxide (HFO). The results showed that the adsorption isotherms of ENR on the two hydrous oxides were both well described by Langmuir model when KL (HFO) >KL (HAO). The adsorption capacity (Qm) of enrofloxacin to HAO/HFO decreased with the increase of ion strength if NaCl concentrations were at a range between 0.01 mol·L-1 and 0.5 mol·L-1. However, the ion strengths in the solution had little effect on the adsorption at the low concentrations of enrofloxacin, which indicated that adsorption of enrofloxacin on the two different hydrous oxides was essentially based on ligand reaction. However, the adsorption efficiency apparently decreased in the strong acidic or alkaline environment. The coordination adsorption mainly occurred at pH 5~8 in the environment. It was found that the coordination point occurred at the C-3 carboxyl site, and the soluble complexes of 1∶1 ENR∶M (Metal ions) were formed in the solution, which was measured by UV spectrometry, ATR-FTIR difference spectrometry and atomic absorption spectrometry. Meanwhile, the formed complex between ENR and HAO/HFO could increase the solubility of ENR in aqueous solution.
- Key words：enrofloxacin aluminum hydroxide iron hydroxide coordination adsorption ligand-promoted dissolution
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