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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Removal of Arsenate from Aqueous Solution by Adsorption onto Titanium Dioxide Nanoparticles
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Removal of Arsenate from Aqueous Solution by Adsorption onto Titanium Dioxide Nanoparticles

机译：吸附到二氧化钛纳米粒子上从水溶液中去除砷酸盐

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Titanium dioxide (TiO_2) was investigated for the removal of pentavalent arsenate from aqueous solution. Kinetic results revealed that arsenate adsorption was almost instantaneous. The extent of arsenate adsorption decreased with increasing pH owing to the decrease of positively charged binding sites on the TiO_2 surface. Adsorption isotherms measured at pH 3 and 7 generally followed the Langmuir model. The maximum uptake capacity ranged from 8 mg g~(-1) at pH 3 to 2.7 mg g~(-1) at pH 7. Addition of phosphate resulted in a significant reduction in arsenate adsorption, indicating that phosphate—a molecular analogue of arsenate—competes with arsenate for the same surface binding sites. By contrast, bicarbonate had little effect on arsenate adsorption, whereas sulfate exhibited a moderate suppression effect. A considerable reduction in arsenate adsorption was also observed in the presence of relatively high concentrations of background electrolytes ( > 50 mmol L~(-1)).
机译：研究了二氧化钛（TiO_2）用于从水溶液中去除五价砷酸盐。动力学结果表明，砷酸盐的吸附几乎是瞬时的。砷的吸附程度随pH的增加而降低，这是由于TiO_2表面带正电的结合位点减少。在pH 3和7下测得的吸附等温线通常遵循Langmuir模型。最大吸收容量在pH 3的8 mg g〜（-1）到pH 7的2.7 mg g〜（-1）范围内。添加磷酸盐会导致砷酸盐的吸附量显着降低，这表明磷酸盐-磷酸的分子类似物。砷酸盐-与砷酸盐竞争相同的表面结合位点。相比之下，碳酸氢盐对砷酸盐的吸附几乎没有影响，而硫酸盐则表现出中等的抑制作用。在存在相对高浓度的背景电解质（> 50 mmol L〜（-1））的情况下，还观察到砷酸盐吸附的显着降低。

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