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机构地区:[1]华南师范大学化学与环境学院,广东广州510006
出 处:《矿物岩石》2008年第4期24-29,共6页Mineralogy and Petrology
基 金:国家自然科学基金(40773080);广东省自然科学基金(05944)
摘 要:采用TEM、X射线衍射分析及BET比表面积测定等手段对合成的针铁矿、赤铁矿两种矿物进行表征,对此两种矿物对苯酚的吸附特性并批处理吸附实验研究结果表明,针铁矿对苯酚的吸附量大于赤铁矿的吸附量;针铁矿吸附苯酚的pH吸收边为峰型曲线,且峰值在pH 7~8。Langmuir方程拟合结果的吻合程度较之Henry线性方程与Freundlich方程高。实验中氧化铁矿物表面对苯酚的吸附则主要表现为表面分子吸附,可能存在表面疏水性作用,而静电离子交换和表面配合吸附模式不明显。The synthesized goethite and hematite were characterized with modern techniques of XRD, TEM and N2-BET specific surface area analysis and the adsorption of phenol on iron oxides was investigated by batch equilibrium experiments. The results showed that the iron oxides have high purity. The pH-dependence isotherm adsorptions of phenol on goethite is a curve with a peak value at pH = 7-8. The concentration-dependence isotherms can be well fitted by Langmuir equation with correlation coefficient R 〉 0.98 for goethite and hematite. In the range of phenol concentration (10 mg/L- 100 mg/L) used in the experiment, the adsorption amount of phenol increased with the increasing of concentration of phenol, and the adsorption ability of goethite for phenol was stronger than that of hematite. In this study, the main mechanism of adsorption of phenol on iron minerals is considered as surface molecule adsorption controlled by specific surface area, but other mechanisms such as hydrophobie interaction, surface anion exchange and ligand exchange surface complexing may exist.
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