title: Degradation of 4-chlorophenol by mixed Fe0/Fe3O4nanoparticles: from the perspective of mechanisms.
abstract: Fe0nanoparticles have been widely studied for pollution abatement in recent years; however, regarding the mechanism for pollutant degradation, studies have mainly focused on the reductive dechlorination by Fe0, and the dynamic process has not been clarified completely. As reported, some organics could be degraded during the oxidation of Fe0by O2, and hydrogen peroxide was supposed to be produced. In this study, Fe3O4, an oxidation product of Fe0, was used to treat the pollutant combining with Fe0nanoparticles, and 4-chlorophenol (4-CP) was used as the model pollutant. The results showed that the addition of Fe3O4nanoparticles hindered the removal of 4-CP by Fe0nanoparticles under anoxic conditions. However, the dechlorination efficiency was improved in the initial 6 h. Under aerobic conditions, the reused Fe3O4nanoparticles would improve the removal and dechlorination of 4-CP. Especially, the dechlorination efficiency was obviously increased. It is proposed that the removal of 4-CP was due to the effects of both nanosized Fe0and Fe3O4- reducing action of Fe0and catalytic oxidation action of Fe3O4. The reducing action of Fe0was the major factor under anoxic conditions. And the catalytic oxidation action of Fe3O4became an important reason under aerobic conditions.
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Rong
authors.initials: R
authors.lastname: Cheng
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Xingyan
authors.initials: X
authors.lastname: Xue
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Yaping
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Mi
authors.initials: M
authors.lastname: Kang
authors.affiliation: School of Environment & Natural Resources, Renmin University of China, No. 59 Zhongguancun Street, Haidian District, Beijing 100872, China E-mail: zhengxiang7825@163.com.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zheng
mesh_terms: D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D054879:Halogenation; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D002733:Chlorophenols; C029107:4-chlorophenol