Fabrication of a Co3O4 monolithic membrane catalyst as an efficient PMS activator for the removal of methylene blue. (31st March 2023)

• Record Type: Journal Article
• Authors: Zhang, Chengkai; Liao, Xiaogang; Wang, Xiaoya; Li, Gang
• Is Part Of: New journal of chemistry. Volume 47:Number 16(2023)
• Page Start: 7668
• Page End: 7677
• Publication Date: 2023-03-31
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj06358a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : An oxalate-pyrolysis method was proposed for the fabrication of an integral Co3 O4 catalyst towards PMS activation to degrade MB. Abstract : In this work, a Co3 O4 monolithic membrane catalyst with a nanosheet-like morphology was successfully fabricated on a porous nickel foam (NF) substrate using a facile two-step approach. The catalytic behavior of this kind of Co3 O4 monolithic membrane in activating peroxymonosulfate (PMS) was evaluated by employing methylene blue (MB) as the degradation model. The results showed that a MB degradation rate of 84.06% could be achieved within 40 min under the reaction conditions: two pieces of NF-based Co3 O4 catalytic films (2 × 4 cm 2 ), 0.6 mmol L −1 of PMS, 10 mg L −1 of MB with a volume of 500 mL, and a temperature of 25 °C. Moreover, ˙OH, SO4 ˙ −, ˙O2 − and 1 O2 were identified as the reactive oxygen species (ROS) responsible for MB degradation by an electron paramagnetic resonance (EPR) technique. Remarkably, the Co3 O4 monolithic membrane catalyst presented a stable performance upon PMS activation. A MB degradation rate of more than 65% could be kept even after eleven consecutive cycling runs. These results revealed that the NF-based Co3 O4 membrane was a promising candidate catalyst towards PMS activation for treating aquatic dye contaminants attributed to its excellent performance and easy recovery nature.