To remove methylene blue dye from water by adsorption, bentonites were modified by polyhedral oligomeric silsesquioxane (POSS) and three kind of quaternary ammonium surfactants (dodecyl trimethyl ammonium bromide, tetrabutyl ammonium bromide, cetyl trimethylammonium bromide) in aqueous solution. Systematic adsorption experiments were carried out, the adsorption mechanism was studied, and the factors governing the adsorption of methylene blue on modified bentonite were discussed. The adsorption capacity of methylene blue on all three modified bentonites in 1000 mg·L⁻¹ solutions quickly reached equilibrium within 2000 s, and the removal rate was basically 100%; however, the removal rate in raw bentonite samples was only 60%. The pseudo second-order kinetic model can provide satisfactory kinetic data fitting. The obtained adsorption isotherms fit well with the Dubinin-Radushkevich isotherm model. The thermodynamic results showed that the adsorption process was a spontaneous endothermic physical adsorption process. With increasing pH and KCl concentration, the removal of methylene blue increased significantly. The results of this study confirmed that the modified bentonite is a candidate material as a cationic dye adsorbent.

为了通过吸附从水中去除亚甲基蓝染料，膨润土通过多面体低聚倍半硅氧烷（POSS）和三种季铵表面活性剂（十二烷基三甲基溴化铵，四丁基溴化铵，十六烷基三甲基溴化铵）进行改性。进行了系统的吸附实验，研究了其吸附机理，并探讨了影响亚甲基蓝在改性膨润土上吸附的因素。在1000 mg·L ^-1下所有三种改性膨润土对亚甲基蓝的吸附能力溶液在2000 s内迅速达到平衡，去除率基本为100％。但是，膨润土样品的去除率仅为60％。伪二级动力学模型可以提供令人满意的动力学数据拟合。获得的吸附等温线与Dubinin-Radushkevich等温线模型非常吻合。热力学结果表明，吸附过程是自发的吸热物理吸附过程。随着pH和KCl浓度的增加，亚甲基蓝的去除量显着增加。该研究结果证实，改性膨润土是作为阳离子染料吸附剂的候选材料。