Zhao Yue, Liu Fei, Qin Xiaopeng
School of Water Resources and Environment, and Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China.
School of Water Resources and Environment, and Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China.
Chemosphere. 2017 Aug;180:373-378. doi: 10.1016/j.chemosphere.2017.04.007. Epub 2017 Apr 3.
The adsorption of diclofenac (DCF), one of the widely used non-steroidal anti-inflammatory drugs, onto the surface of goethite was investigated with batch experiments. The adsorption at different pH values (5.3, 7.4, and 10.0) were well fitted with the pseudo-second-order model. The results showed that the adsorption of DCF onto goethite was strongly depended on solution pH. The amount of adsorbed DCF decreased with increasing pH duo to electrostatic repulsive interactions. Fourier transform infrared (FTIR) results indicated that carboxyl group (COOH) might be involved in the adsorption, and DCF formed bidentate chelate and bridging bidentate complexes on the surface of goethite.
通过批量实验研究了广泛使用的非甾体抗炎药之一双氯芬酸（DCF）在针铁矿表面的吸附情况。在不同pH值（5.3、7.4和10.0）下的吸附情况与准二级模型拟合良好。结果表明，DCF在针铁矿上的吸附强烈依赖于溶液pH值。由于静电排斥作用，随着pH值升高，DCF的吸附量减少。傅里叶变换红外光谱（FTIR）结果表明，羧基（COOH）可能参与了吸附过程，并且DCF在针铁矿表面形成了双齿螯合物和桥连双齿配合物。
