Adsorption of levofloxacin onto goethite: effects of pH, calcium and phosphate.
Adsorption of levofloxacin onto goethite: effects of pH, calcium and phosphate.
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DOI：
10.1016/j.colsurfb.2013.09.056
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
X. Qin;Fei Liu;Guangcai Wang;L. Weng;Lu Li
中科院分区：
文献类型：
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作者：
X. Qin;Fei Liu;Guangcai Wang;L. Weng;Lu Li
研究了针铁矿对抗生素左氧氟沙星（LEV）的吸附行为。LEV在针铁矿上的吸附具有pH依赖性。在pH 6时达到最大吸附。高于或低于pH 6，吸附降低。在钙（Ca 2+）的存在下，吸附减少，观察到，由于可能形成的Ca 2 +-LEV复合物在溶液中。磷酸盐在pH 3-10范围内对LEV吸附也表现出显著的抑制作用。磷酸盐与LEV竞争针铁矿表面的结合位点，LEV与磷酸盐在针铁矿表面的静电竞争可能是导致吸附量下降的另一个原因。这些结果表明，Ca 2+和磷酸盐对LEV在土壤和沃茨中的分布有很大影响，最终影响其在环境中的抗菌活性。
Adsorption of levofloxacin (LEV), one of the extensively used antibiotics, onto goethite was investigated using batch experiments. The adsorption of LEV on goethite was pH-dependent. A maximum adsorption was reached at pH 6. Above or below pH 6, the adsorption decreased. In the presence of calcium (Ca2+), a decrease in adsorption was observed, due to probably formation of Ca2+–LEV complexes in solutions. Phosphate also showed a significant inhibition on LEV adsorption over a pH range of 3–10. Phosphate competed with LEV for binding sites on the surface of goethite, and the electrostatic competition between LEV and phosphate on goethite surface might be another reason for the decrease in adsorption. These results indicated that Ca2+and phosphate have a great influence on the distribution of LEV in soils and waters, which will eventually affect its antibacterial activity in the environment.