中文摘要：

研究了环境相关pH（5.0—11.0）、盐度（NaCl和CaCl20—500 mmol.L-1）条件下,纳米二氧化钛（nano-TiO2）对不同浓度腐殖酸（HA,以溶解性有机碳DOC计0—100 mg.L-1）的吸附.结果表明,nano-TiO2对HA的吸附迅速达到平衡,符合Freundlich吸附等温线模型.对于高浓度HA体系（40—100 mg.L-1DOC）,吸附量随着pH的上升逐渐减弱,随着盐度的上升先增加后减少;而对于低浓度HA体系（〈40 mg.L-1DOC）,未观察到pH和盐度的影响.从静电吸引、疏水性作用等角度对吸附机理进行了阐述.

英文摘要：

This article studied the adsorption behavior of humic acid（HA） onto titanium dioxide nanoparticles（nano-TiO2）under environmentally relevant conditions,pH（5.0—11.0）and NaCl or CaCl2 0—500 mmol·L-1.The results demonstrated that the adsorption reached equilibrium rapidly and complied with Freundlich adsorption isotherm,and that different HA concentrations showed different adsorption phenomena.At high HA concentrations（40—100 mg·L-1 DOC）,the adsorption decreased gradually with the increase of pH,whereas it increased initially and then decreased with the increase of salinity.At low HA concentrations（40 mg·L-1 DOC）,no significant influence of pH and salinity was observed.The adsorption mechanism was interpreted in the views of electrostatic attraction,hydrophobicity and et al.