Activation of peroxymonosulfate by palygorskite supported Co-Fe for water treatment

Wenxiang Xia; Qianqian Wu; Rui Huang; Yinglu Tao; Kaimei Wang; Shuxiao Wu; Songxue Wang; Mingli Wang; Qingsheng Li

doi:10.1039/d2ra07948h

Activation of peroxymonosulfate by palygorskite supported Co-Fe for water treatment

RSC Adv. 2023 Apr 21;13(18):12483-12494. doi: 10.1039/d2ra07948h. eCollection 2023 Apr 17.

Authors

Wenxiang Xia¹, Qianqian Wu¹, Rui Huang², Yinglu Tao¹, Kaimei Wang¹, Shuxiao Wu¹, Songxue Wang¹, Mingli Wang³, Qingsheng Li⁴

Affiliations

¹ School of Environmental and Municipal Engineering, Qingdao University of Technology Qingdao 266520 China songxue.wang@outlook.com.
² Guangdong GDH Water Co. Ltd Shenzhen 518021 China.
³ Shandong Provincial Qingdao Eco-environment Monitoring Center Qingdao 266003 China.
⁴ Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration Xiamen 361005 China.

Abstract

In the present work, palygorskite (PAL) supported Co-Fe oxides (CoFe@PAL) were prepared and used as a peroxymonosulfate (PMS) activator for removal of rhodamine B (RhB) in water. The results showed that CoFe@PAL prepared at impregnation solution of 50 g L^-1 and calcination temperature of 500 °C showed the best catalytic performance. The removal efficiency of RhB (10 mg L^-1) by PMS (0.1 mmol L^-1) activated with CoFe@PAL (1 g L^-1) was above 98% within 60 min. The effects of various environmental factors including initial pH, humic acid (HA) and inorganic anions on the removal effect were simultaneously investigated. The radical quenching experiments and EPR characterization revealed that ˙OH, SO₄˙^-, O₂˙^- and ¹O₂ radicals existed in the CoFe@PAL/PMS system simultaneously. The intermediates during RhB degradation were analyzed by LC-MS and possible degradation pathways of RhB were proposed. Moreover, CoFe@PAL exhibited superior stability and reusability.