Catalytic oxidation of bisphenol A with Co$^{3+}$ rich spinel Co$_3$O$_4$ : performance evaluation with peroxymonosulfate activation and mineralization mechanism

Singh, Seema (author), Kumar, Praveen (author), Patidar, Ritesh (author), Srivastava, Vimal Chandra (author), Lo, Shang-Lien (author), Lavrenčič Štangar, Urška (author)

Bisphenol A (BPA) is a toxic substance that is released into the environment mainly from paint, polymer, plastics and pharmaceutical industries. In this study, spinel Co$_3$O$_4$ consisting of Co$^{2+}$/(Co$^{3+}$)$_2$O$_4$ nanospheres with excellent specific surface properties were systematically synthesized via a simple hydrothermal approach preceded by calcination. The as-synthesized Co$_3$O$_4$ spinels were used for peroxymonosulfate (PMS) activation to reduce the bisphenol A (BPA). The effects of operating parameters including PMS dosage, initial pH, catalyst dosage, and co-existing ions were detected during the BPA degradation. It was observed that at neutral pH, the nano-Co$_3$O$_4$/PMS system effectively degrades the BPA (∼92%) with very low cobalt leaching and excellent recyclability. Control experiment analysis confirms the magnificent performance of the Co$_3$O$_4$/PMS system and the synergistic interaction between Co$_3$O$_4$ and PMS. Various characterization techniques were used to determine the thermal, textural and structural properties. A chemical quenching study confirmed that both hydroxyl radicals ($^•$OH) and sulfate radicals (SO$_4^{•−}$) promotes BPA oxidation. The chloride (Cl$^-$) ions and dihydrogen phosphate ions (H$_2$PO$_4^-$) have little inhibition effect while adding humic acid (HA) and HCO$_3^-$ inhibits the BPA oxidation. Separation techniques such as high-performance liquid chromatography (HPLC) coupled with mass spectroscopy (MS) were used to identify the oxidative by-products and the mineralization pathway of BPA reduction. First-order pseudo-kinetics were observed for BPA degradation. However, the power law model also fits n$^{th}$-order kinetics models.

• Language: English
• Keywords: cobalt(II, III) oxide nanospheres, peroxymonosulfate activation, bisphenol A, degradation kinetics, mineralization mechanism, Co$_3$O$_4$ nanospheres, PMS, BPA
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 12 str.
• Numbering: Vol. 11, iss. 3, art. 110023
• PID: 20.500.12556/RUL-146101
• UDC: 542.943'7
• ISSN on article: 2213-3437
• DOI: 10.1016/j.jece.2023.110023
• COBISS.SI-ID: 151397379
• Publication date in RUL: 19.05.2023

Record is a part of a journal

• Title: Journal of environmental chemical engineering
• Publisher: Elsevier
• ISSN: 2213-3437
• COBISS.SI-ID: 519695385

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: kobaltov(II, III) oksid, nanodelci, aktivacija peroksimonosulfata, bisfenol A, BPA, kinetika razgradnje, mehanizem mineralizacije