Zhang Yongjun, Prigent Bastien, Geißen Sven-Uwe
College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, PR China; TechnischeUniversität Berlin, Department of Environmental Technology, Chair of Environmental Process Engineering, Secr. KF 2, Straße des 17. Juni 135, 10623 Berlin, Germany.
TechnischeUniversität Berlin, Department of Environmental Technology, Chair of Environmental Process Engineering, Secr. KF 2, Straße des 17. Juni 135, 10623 Berlin, Germany.
Chemosphere. 2016 Jul;154:132-137. doi: 10.1016/j.chemosphere.2016.03.079. Epub 2016 Apr 1.
Regeneration of loaded adsorbents is a key step for the sustainability of an adsorption process. In this study, ozone was applied to regenerate a synthetic zeolite for the adsorption of trichlorophenol (TCP) as an organic model pollutant. Three initial concentrations of TCP in water phase were used in adsorption tests. After the equilibrium, zeolite loaded different amounts of TCP was dried and then regenerated with ozone gas. It was found that the adsorption capacity of zeolite was increased through three regeneration cycles. However, the adsorption kinetics was compromised after the regeneration with slightly declined 2nd order reaction constants. The ozone demand for the regeneration was highly dependent on the TCP mass loaded onto the zeolite. It was estimated that the mass ratio of ozone to TCP was 1.2 ± 0.3 g O3/g TCP.
负载型吸附剂的再生是吸附过程可持续性的关键步骤。在本研究中，采用臭氧对用于吸附作为有机模型污染物的三氯苯酚（TCP）的合成沸石进行再生。吸附试验中使用了水相中三种初始浓度的TCP。达到平衡后，将负载不同量TCP的沸石干燥，然后用臭氧气体进行再生。结果发现，通过三个再生循环，沸石的吸附容量有所增加。然而，再生后吸附动力学受到影响，二级反应常数略有下降。再生所需的臭氧量高度依赖于负载在沸石上的TCP质量。据估计，臭氧与TCP的质量比为1.2±0.3 g O₃/g TCP。
