Department of Environmental Engineering, China Jiliang University, Hangzhou, 310018, China.
Department of Environmental Engineering, China Jiliang University, Hangzhou, 310018, China.
Environ Pollut. 2021 Apr 1;274:116591. doi: 10.1016/j.envpol.2021.116591. Epub 2021 Jan 25.
Pharmaceutical antibiotics have recently become emerging environmental contaminants. To enhance the removal efficiency of antibiotics in water, hierarchically porous carbons (HPCs) with designed porous patterns are used in both batch and column mode adsorption processes in this study, and the role of their nanoporous geometry in the adsorption dynamics are explored. THPC (HPC with trimodal pores) and DHPC (HPC with bimodal pores) exhibit remarkably superior adsorption performances to the selected antibiotics than those of commercial activated carbon (AC) with similar surface area, especially in column mode adsorption. The effective treatment volumes of the HPC-columns remain up to 8-10 times those of the AC-columns for the removal of tetracycline and 4-6 times for the removal of tylosin. The mass transfer rates of the carbon-based columns present the order of THPC > DHPC > AC. As comparison, the columns based on monomodal mesoporous carbon (MEC) and microporous carbon (MAC) exhibit low effective treatment volumes although their high mass transfer speed. The interconnected meso/macropores in HPCs benefit the intraparticle mass transfer of guest molecules and the accessibility of adsorption sites. The micropores linking to the meso/macropores not only provide adsorption sites but also facilitate adsorption affinity.
药物抗生素最近已成为新兴的环境污染物。为了提高水中抗生素的去除效率，本研究在批式和柱式吸附过程中使用了具有设计多孔模式的分级多孔碳（HPC），并探索了其纳米多孔几何形状在吸附动力学中的作用。THPC（具有三孔的 HPC）和 DHPC（具有双峰的 HPC）在吸附性能方面明显优于具有相似表面积的商业活性炭（AC），对所选抗生素的吸附性能尤其如此，尤其是在柱式吸附中。对于四环素的去除，HPC 柱的有效处理量高达 AC 柱的 8-10 倍，对于泰乐菌素的去除，HPC 柱的有效处理量高达 AC 柱的 4-6 倍。碳基柱的传质速率顺序为 THPC>DHPC>AC。相比之下，尽管具有较高的传质速率，但基于单模态中孔/大孔碳（MEC）和微孔碳（MAC）的柱的有效处理量较低。HPC 中的相互连接的中孔/大孔有利于客体分子的颗粒内传质和吸附位点的可及性。连接中孔/大孔的微孔不仅提供了吸附位点，而且还促进了吸附亲和力。
