eprintid: 10137178 rev_number: 14 eprint_status: archive userid: 608 dir: disk0/10/13/71/78 datestamp: 2021-10-28 09:39:11 lastmod: 2022-08-12 10:00:50 status_changed: 2021-10-28 09:39:11 type: article metadata_visibility: show creators_name: Hammad, M creators_name: Alkan, B creators_name: Al-kamal, AK creators_name: Kim, C creators_name: Ali, MY creators_name: Angel, S creators_name: Wiedemann, HTA creators_name: Klippert, D creators_name: Schmidt, TC creators_name: Kay, CWM creators_name: Wiggers, H title: Enhanced heterogeneous activation of peroxymonosulfate by Ruddlesden-Popper-type La2CoO4+δ nanoparticles for bisphenol A degradation ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F64 keywords: Heterogeneous catalysis, Spray flame synthesis, Peroxymonosulfate, Sulfate radical, Bisphenol A degradation note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. 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. date: 2022-02-01 date_type: published official_url: https://doi.org/10.1016/j.cej.2021.131447 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1892808 doi: 10.1016/j.cej.2021.131447 lyricists_name: Kay, Christopher lyricists_id: CWKAY79 actors_name: Kay, Christopher actors_id: CWKAY79 actors_role: owner full_text_status: public publication: Chemical Engineering Journal volume: 429 article_number: 131447 citation: Hammad, M; Alkan, B; Al-kamal, AK; Kim, C; Ali, MY; Angel, S; Wiedemann, HTA; ... Wiggers, H; + view all <#> Hammad, M; Alkan, B; Al-kamal, AK; Kim, C; Ali, MY; Angel, S; Wiedemann, HTA; Klippert, D; Schmidt, TC; Kay, CWM; Wiggers, H; - view fewer <#> (2022) Enhanced heterogeneous activation of peroxymonosulfate by Ruddlesden-Popper-type La2CoO4+δ nanoparticles for bisphenol A degradation. Chemical Engineering Journal , 429 , Article 131447. 10.1016/j.cej.2021.131447 <https://doi.org/10.1016/j.cej.2021.131447>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10137178/1/20211027_La2CoO4_manuscript%20accepted.pdf