College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, PR China; State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, PR China.
College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, PR China.
Chemosphere. 2020 Jul;251:126074. doi: 10.1016/j.chemosphere.2020.126074. Epub 2020 Feb 12.
The adsorption method is generally considered a promising technique to remove inorganic and organic contaminants in an economically and environmentally friendly superior manner. In this study, organic montmorillonite sodium alginate composites were prepared, in which, montmorillonite and cationic surfactant (cetyltrimethylammonium bromide, CTAB) in different added amounts were coagulated with sodium alginate using CaCl as the crosslinking agent. The morphological properties of the composites were characterized thoroughly and employed in three typical target pollutants of polycyclic aromatic hydrocarbons (PAHs) (acenaphthene, fluorene, and phenanthrene) by batch adsorption experiments from aqueous solution. The composites provide an efficient alternative for PAHs removals. The composites could be stably separated and regenerated with methyl alcohol. Furthermore, the adsorption kinetic and isotherm data were well described by the Elovich kinetic and the Freundlich isotherm model, respectively. According to these, the adsorption process occurred via multilayer adsorption on the composite's energetically heterogeneous surface. Moreover, pore diffusion and hydrophobicity played a dominant role in the adsorption mechanism. Overall, our study offers a developed adsorbent that has the advantage of being recyclable, low cost, biodegradable and biocompatible for effectively removing PAHs from aqueous solution.
吸附法通常被认为是一种很有前途的技术，可以以经济和环境友好的方式去除无机和有机污染物。在本研究中，制备了有机蒙脱土海藻酸钠复合材料，其中蒙脱土和阳离子表面活性剂（十六烷基三甲基溴化铵，CTAB）以不同的添加量与海藻酸钠混合，并用氯化钙作为交联剂。通过批量吸附实验，对复合材料的形态特性进行了深入的表征，并将其用于三种典型的多环芳烃（PAHs）（苊、芴和菲）的去除。复合材料为 PAHs 的去除提供了一种有效的替代方法。复合材料可以用甲醇稳定地分离和再生。此外，吸附动力学和等温线数据分别很好地由 Elovich 动力学和 Freundlich 等温线模型描述。根据这些模型，吸附过程是通过在复合材料的能量异质表面上的多层吸附发生的。此外，孔扩散和疏水性在吸附机制中起主导作用。总的来说，我们的研究提供了一种可回收、成本低、可生物降解和生物相容的新型吸附剂，可有效去除水溶液中的 PAHs。
