Department of Agricultural Sciences, University of Bologna, Bologna 40127, Italy; NanoSiSTeMI Interdisciplinary Centre, Università del Piemonte Orientale A. Avogadro, Alessandria 15121, Italy.
Department of Agricultural Sciences, University of Bologna, Bologna 40127, Italy.
J Environ Sci (China). 2016 May;43:302-312. doi: 10.1016/j.jes.2015.07.017. Epub 2015 Nov 11.
High silica zeolite Y has been positively evaluated to clean-up water polluted with sulfonamides, an antibiotic family which is known to be involved in the antibiotic resistance evolution. To define possible strategies for the exhausted zeolite regeneration, the efficacy of some chemico-physical treatments on the zeolite loaded with four different sulfonamides was evaluated. The evolution of photolysis, Fenton-like reaction, thermal treatments, and solvent extractions and the occurrence in the zeolite pores of organic residues eventually entrapped was elucidated by a combined thermogravimetric (TGA-DTA), diffractometric (XRPD), and spectroscopic (FT-IR) approach. The chemical processes were not able to remove the organic guest from zeolite pores and a limited transformation on embedded molecules was observed. On the contrary, both thermal treatment and solvent extraction succeeded in the regeneration of the zeolite loaded from deionized and natural fresh water. The recyclability of regenerated zeolite was evaluated over several adsorption/regeneration cycles, due to the treatment efficacy and its stability as well as the ability to regain the structural features of the unloaded material.
高硅沸石 Y 已被积极评估用于净化被磺胺类药物污染的水，磺胺类药物是一种已知参与抗生素耐药性进化的抗生素家族。为了确定对耗尽的沸石进行再生的可能策略，评估了几种化学-物理处理方法对负载四种不同磺胺类药物的沸石的效果。通过热重（TGA-DTA）、衍射（XRPD）和光谱（FT-IR）相结合的方法，阐明了光解、类 Fenton 反应、热处理、溶剂萃取以及最终被困在沸石孔中的有机残留物的演化。化学过程无法将有机客体从沸石孔中去除，并且观察到嵌入分子的有限转化。相反，热处理和溶剂萃取都成功地从去离子水和天然淡水负载的沸石中进行了再生。由于处理效果及其稳定性以及恢复未负载材料的结构特征的能力，对再生沸石进行了多次吸附/再生循环的可回收性评估。
