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Enhanced heterogeneous activation of peroxymonosulfate by Ruddlesden-Popper-type La<inf>2</inf>CoO<inf>4+δ</inf> nanoparticles for bisphenol A degradation

Hammad, M; Alkan, B; Al-kamal, AK; Kim, C; Ali, MY; Angel, S; Wiedemann, HTA; ... Wiggers, H; + view all (2022) Enhanced heterogeneous activation of peroxymonosulfate by Ruddlesden-Popper-type La<inf>2</inf>CoO<inf>4+δ</inf> nanoparticles for bisphenol A degradation. Chemical Engineering Journal , 429 , Article 131447. 10.1016/j.cej.2021.131447.

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Abstract

The scalable synthesis of stable catalysts for environmental remediation applications remains challenging. Nonetheless, metal leaching is a serious environmental issue hindering the practical application of transition-metal based catalysts including Co-based catalysts. Herein, for the first time, we describe a facile one-step and scalable spray-flame synthesis of high surface area La2CoO4+δ nanoparticles containing excess oxygen interstitials (+δ) and use them as a stable and efficient catalyst for activating peroxymonosulfate (PMS) towards the degradation of bisphenol A. Importantly, the La2CoO4+δ catalyst exhibits higher catalytic degradation of bisphenol A (95% in 20 min) and stability than LaCoO3–x nanoparticles (60%) in the peroxymonosulfate activation system. The high content of Co2+ in the structure showed a strong impact on the catalytic performance of the La2CoO4+δ + PMS system. Despite its high specific surface area, our results showed a very low amount of leached cobalt (less than 0.04 mg/L in 30 min), distinguishing it as a material with high chemical stability. According to the radical quenching experiments and the electron paramagnetic resonance technology, SO4[rad]–, [rad]OH, and 1O2 were generated and SO4[rad]– played a dominant role in bisphenol A degradation. Moreover, the La2CoO4+δ + PMS system maintained conspicuous catalytic performance for the degradation of other organic pollutants including methyl orange, rhodamine B, and methylene blue. Overall, our results showed that we developed a new synthesis method for stable La2CoO4+δ nanoparticles that can be used as a highly active heterogeneous catalyst for PMS-assisted oxidation of organic pollutants.

Type: Article
Title: Enhanced heterogeneous activation of peroxymonosulfate by Ruddlesden-Popper-type La<inf>2</inf>CoO<inf>4+δ</inf> nanoparticles for bisphenol A degradation
DOI: 10.1016/j.cej.2021.131447
Publisher version: https://doi.org/10.1016/j.cej.2021.131447
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Heterogeneous catalysis, Spray flame synthesis, Peroxymonosulfate, Sulfate radical, Bisphenol A degradation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10137178
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