Octadecylamine degradation through catalytic activation of peroxymonosulfate by FeMn layered double hydroxide

Gong Chen; Li-Chao Nengzi; Bo Li; Yingjie Gao; Guixian Zhu; Xiuwen Cheng

doi:10.1016/j.scitotenv.2019.133963

Octadecylamine degradation through catalytic activation of peroxymonosulfate by FeMn layered double hydroxide

Sci Total Environ. 2019 Dec 10:695:133963. doi: 10.1016/j.scitotenv.2019.133963. Epub 2019 Aug 17.

Authors

Gong Chen¹, Li-Chao Nengzi², Bo Li¹, Yingjie Gao¹, Guixian Zhu¹, Xiuwen Cheng³

Affiliations

¹ Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China.
² Academy of Economics and Environmental Sciences, Xichang University, PR China.
³ Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China; Academy of Economics and Environmental Sciences, Xichang University, PR China. Electronic address: chengxw@lzu.edu.cn.

PMID: 31756847
DOI: 10.1016/j.scitotenv.2019.133963

Abstract

A kind of heterogeneous catalyst, FeMn layered double hydroxide (Fe-Mn-LDH), was fabricated by coprecipitation process and used as PMS activator to degrade a novel organic pollutant octadecylamine (ODA). And the X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microcopy (TEM), Mapping and X-ray photoelectron spectra (XPS) measurements were utilized to characterize the fresh and used Fe-Mn-LDH. After a serious of degradation experiments, it was clearly to see that the activator possessed excellent activation property for PMS and was capable of removing 85% ODA (10 mg·L^-1) within 25 min obviously higher than pure PMS. Moreover, the effect of some elements (such as PMS consumption, catalyst consistence and initial pH value), different reaction system and catalyst repeatability on ODA degradation were also explored. And by identification of main radical experiment, SO₄^- and HO were both confirmed the primary radicals. What's more, extra anion and nature organic matter (NOM) addition experiment displayed that NOM, NO₃^- and CO₃^2- perform a negative effect on ODA degradation but Cl^- could promote it. In addition, repeated experiments and metal leaching after degradation showed good stability of Fe-Mn-LDH. Finally, based on the XPS and Gas Chromatography-Mass Spectrometer (GS-MS) technology, the possible degradation mechanism and pathway were proposed.

Keywords: Fe-Mn-LDH; GC–MS; Mechanism and pathway; Octadecylamine; PMS.