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通过静态吸附实验,研究了Al2(SO4)3、Al Cl3、Al(NO3)33种铝盐对凹凸棒石的复合改性及其除氟效果。复合改性的最优条件为Al2(SO4)3浓度0.05 mol·L-1、浸泡时间2 h、固液比1∶3,Al Cl3浓度0.4 mol·L-1、浸泡时间5 h、固液比1∶2,Al(NO3)3浓度0.2 mol·L-1、浸泡时间6 h、固液比1∶2。复合改性的凹凸棒石吸附容量达到1.317 mg·g-1,是改性前的13.9倍,吸附容量显著提高。复合改性的凹凸棒石对水中氟的吸附动力学符合拟二级动力学模型,吸附等温线更符合Langmuir等温吸附规律。吸附最佳p H为7,改性后的凹凸棒石表面更疏松粗糙,孔穴和孔道增多增大,但晶体结构未变。
Through the static adsorption experiments, the composite modification of 33 kinds of Al2 (SO4) 3, AlCl3, Al (NO3) 3 aluminum salts on palygorskite and the effect of fluoride removal were studied. The optimum conditions for the composite modification were that the concentration of Al2 (SO4) 3 was 0.05 mol·L-1, the soaking time was 2 h, the solid-liquid ratio was 1: 3, the concentration of Al Cl3 was 0.4 mol·L-1, the soaking time was 5 h, The ratio of Al (NO3) 3 was 0.2 mol·L-1, the soaking time was 6 h and the solid-liquid ratio was 1: 2. The composite modified attapulgite adsorption capacity of 1.317 mg · g-1, 13.9 times before the modification, the adsorption capacity increased significantly. The adsorption kinetics of fluoride on water by composite modified attapulgite conforms to the pseudo second-order kinetic model. The adsorption isotherms are more consistent with the Langmuir isotherm adsorption law. The best adsorption p H is 7, the surface of the modified attapulgite is more loose and rough, the pores and pores increase more, but the crystal structure has not changed.