Efficient Treatment of Phenol Wastewater by Catalytic Ozonation over Micron-Sized Hollow MgO Rods

Shanshan Zhang; Lilong Zhou; Zhengjie Li; Ali Asghar Esmailpour; Kunjie Li; Shuhuan Wang; Runjing Liu; Xiaoyan Li; Jimmy Yun

doi:10.1021/acsomega.1c03497

Efficient Treatment of Phenol Wastewater by Catalytic Ozonation over Micron-Sized Hollow MgO Rods

ACS Omega. 2021 Sep 24;6(39):25506-25517. doi: 10.1021/acsomega.1c03497. eCollection 2021 Oct 5.

Authors

Shanshan Zhang¹, Lilong Zhou¹, Zhengjie Li¹, Ali Asghar Esmailpour², Kunjie Li¹, Shuhuan Wang¹, Runjing Liu¹, Xiaoyan Li³, Jimmy Yun^{1

2

4}

Affiliations

¹ College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, P. R. China.
² School of Chemical Engineering, The University of New South Wales, Australia, Sydney, NSW 2052, Australia.
³ College of Textile and Garments, Hebei University of Science and Technology. Shijiazhuang, Hebei 050018, P. R. China.
⁴ Tianjushi Engineering & Technology Group Co., Ltd., Shijiazhuang, Hebei 050000, P. R. China.

Abstract

Phenol is a nocuous water pollutant that threatens human health and the ecological environment. CoO_x-doped micron-sized hollow MgO rods were prepared for the treatment of phenol wastewater by catalytic ozonation. Magnesium sources, precipitants, initial precursor concentration, Co/Mg molar ratio, and catalyst calcination temperature were optimized to obtain the best catalysts. Prepared catalysts were also well characterized by various methods to analyze their structure and physical and chemical properties. In this process, CoO_x/MgO with the largest large surface area (151.3 m³/g) showed the best catalytic performance (100 and 79.8% of phenol and chemical oxygen demand (COD) removal ratio, respectively). The hydrolysis of CoO_x/MgO plays a positive role in the degradation of phenol. The catalytic mechanism of the degradation of O₃ to free radicals over catalysts has been investigated by in situ electronic paramagnetic resonance (EPR). The catalyst can be reused at least five times without any activity decline. The prepared CoO_x/MgO catalyst also showed excellent catalytic performance for removal and degradation of ciprofloxacin, norfloxacin, and salicylic acid.