F-F@FeS@5C-400催化剂的制备及其活化过硫酸盐降解环丙沙星的性能与机理研究

Preparation of F-F@FeS@5C-400 catalyst and its performance and mechanism of activated persulfate degradation of ciprofloxacin

O要:铁基复合材料在活化过硫酸盐(PMS)去除水体中难降解有机污染物方面具有明显优势,但目前研究的材料大多是粉末材料,存在铁溶出率高、难回收等问题.为此,采用泡沫铁(F-F)为载体原位生长纳米FeS,并在表面包覆碳层,制备F-F@FeS@5C-400,用于活化PMS降解环丙沙星(CIP).采用XRD、Raman、XPS等对复合材料进行表征,并考察不同催化剂对CIP降解性能.探究催化剂投加量、PMS投加量、pH对CIP降解的影响.在催化剂投加量为0.10 g·L^(-1)、pH为7、PMS投加量为0.10g·L^(-1)的条件下,F-F@FeS@5C-400在9 min对CIP的去除率达到97.95%.催化剂在重复利用8次后仍能保持稳定的性能,并探究了外加阴离子及可溶性有机质对CIP降解的影响.此外,淬灭试验及EPR分析表明,降解CIP的主要活性物种包括SO_(4)^(·-)、·OH、O_(2)^(·-)和^(1)O_(2),其中SO_(4)^(·-)和·OH起主导作用.

Iron-based composites have obvious advantages in activating peroxymonosulfate(PMS) to remove refractory organic pollutants from water,but most of the materials studied at present are powder materials,which have problems such as high iron dissolution rates and difficult recovery.To address this,FeS nanoparticles were in situ grown on foamed iron(F-F) and coated with carbon layer to prepare F-F@FeS@5C-400,which was used to activate PMS to degrade ciprofloxacin(CIP).XRD,Raman and XPS were used to analyze the composites and the CIP degradation properties of different catalysts were investigated.The effects of catalyst dosage,PMS dosage and pH on CIP degradation were explored.Under the conditions of 0.10g·L^(-1) catalyst dosage,pH=7 and PMS dosage of 0.10 g·L^(-1),the CIP removal rate by F-F@FeS@5C-400 reached 97.95% in 9 min.The catalyst remained stable after 8 reuse cycles,and the effects of added anion and soluble organic matter on CIP degradation were investigated.In addition,the quenching test and EPR analyses showed that the main active species involved in CIP degradation included SO_(4)^(-),·OH,O_(2)^(·-) and ^(1)O_(2),with SO_(4)^(·-)and·OH playing primary roles.