羟基铁柱撑蒙脱石对庆大霉素的吸附性能

发布时间：2018-02-28 12:27

本文关键词： 蒙脱石羟基铁柱撑庆大霉素吸附　出处：《硅酸盐学报》2016年02期 　论文类型：期刊论文

【摘要】：以蒙脱石K10为原料,制备出OH/Fe摩尔比分别为0.6、0.8、1.0、1.5和2.0的系列羟基铁柱撑蒙脱石吸附剂(OH/Fe蒙脱石),比较它们对庆大霉素的吸附能力,研究pH值和时间等因素对OH/Fe蒙脱石吸附庆大霉素的影响规律,并分析吸附机理。结果表明:柱撑OH/Fe蒙脱石对庆大霉素吸附量从低到高依次为K10(33.3 mg/g)、0.6 OH/Fe(43.4 mg/g)、0.8 OH/Fe(44.8 mg/g)、1.0 OH/Fe(56.0 mg/g)、2.0 OH/Fe(64.8 mg/g)、1.5 OH/Fe(71.9 mg/g),OH/Fe摩尔比为1.5时吸附量最大,达到K10的2倍以上,符合Freundlich吸附等温线。柱撑蒙脱石对庆大霉素的吸附在3 h内接近吸附平衡,并且吸附量随pH值的增加而显著增加,吸附可用伪二阶动力学方程描述。吸附量增大主要归功于柱撑后蒙脱石层间距增大,阳离子交换是庆大霉素进入蒙脱石的主导机制,表面配位的化学吸附也是另一种辅助机制,同时羟基铁柱撑蒙脱石吸附庆大霉素后柱撑结构易坍塌。
[Abstract]:The montmorillonite K10 as raw materials, preparation of OH/Fe molar ratio was 0.6,0.8,1.0,1.5 and 2 respectively. The series of hydroxyl Fe pillared montmorillonite adsorbent (OH/Fe montmorillonite), comparing them to gentamicin adsorption capacity, the influence of pH value and time on the adsorption of montmorillonite OH/Fe gentamicin, and adsorption mechanism was analyzed. The results show that the pillared OH/Fe the adsorption capacity of montmorillonite on gentamicin from low to high order K10 (33.3 mg/g), 0.6 OH/Fe (43.4 mg/g), 0.8 OH/Fe (44.8 mg/g), 1 OH/Fe (56 mg/g), 2 OH/Fe (64.8 mg/g), 1.5 OH (71.9 /Fe mg/g), OH/Fe = 1.5 the maximum adsorption amount, up to K10 more than 2 times, with Freundlich adsorption isotherm. The adsorption of Pillared Montmorillonite on gentamicin within 3 h close to the adsorption equilibrium and adsorption increased with pH value increased, the adsorption available pseudo two order kinetic equation could describe the adsorption capacity increases. Mainly due to post pillared interlayer spacing increases, cation exchange is the dominant mechanism of gentamicin into montmorillonite, chemical adsorption surface coordination is another auxiliary mechanism, while the hydroxyl iron pillared montmorillonite pillared structure after gentamicin adsorption is easy to collapse.

【作者单位】：福州大学石油化工学院;福州大学环境与资源学院;
【基金】：国家自然科学基金青年科学基金(21303019) 福建省自然科学基金(2015J01197)
【分类号】：X505;TQ424

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