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Delarmelina M, Dlamini MW, Pattisson S, Davies PR, Hutchings GJ, Catlow CRA. The effect of dissolved chlorides on the photocatalytic degradation properties of titania in wastewater treatment. Phys Chem Chem Phys 2023; 25:4161-4176. [PMID: 36655703 DOI: 10.1039/d2cp03140j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We investigate the effect of chlorides on the photocatalytic degradation of phenol by titania polymorphs (anatase and rutile). We demonstrate how solubilised chlorides can affect the hydroxyl radical formation on both polymorphs with an overall effect on their photodegradative activity. Initially, the photocatalytic activity of anatase and rutile for phenol degradation is investigated in both standard water and brines. With anatase, a significant reduction of the phenol conversion rate is observed (from a pseudo-first-order rate constant k = 5.3 × 10-3 min-1 to k = 3.5 × 10-3 min-1). In contrast, the presence of solubilised chlorides results in enhancement of rutile activity under the same reaction conditions (from 2.3 × 10-3 min-1 to 4.8 × 10-3 min-1). Periodic DFT methods are extensively employed and we show that after the generation of charge separation in the modelled titania systems, adsorbed chlorides are the preferential site for partial hole localisation, although small energy differences are computed between partially localised hole densities over adsorbed chloride or hydroxyl. Moreover, chlorides can reduce or inhibit the ability of r-TiO2 (110) and a-TiO2 (101) systems to localise polarons in the slab structure. These results indicate that both mechanisms - hole scavenging and the inhibition of hole localisation - can be the origin of the effect of chlorides on photocatalytic activity of both titania polymorphs. These results provide fundamental insight into the photocatalytic properties of titania polymorphs and elucidate the effect of adsorbed anions over radical formation and oxidative decomposition of organic pollutants.
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Affiliation(s)
- Maicon Delarmelina
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK. .,UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, UK
| | - Mbongiseni W Dlamini
- UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, UK.,Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Samuel Pattisson
- Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Philip R Davies
- UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, UK.,Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - Graham J Hutchings
- UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, UK.,Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis FUNCAT, Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, UK
| | - C Richard A Catlow
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK. .,UK Catalysis Hub, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0FA, UK.,Department of Chemistry, University College London, 20 Gordon St., London WC1 HOAJ, UK
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Hutchings GJ, Davies PR, Pattisson S, Davies TE, Morgan DJ, Dlamini MW. Facile synthesis of a porous 3D g-C3N4 photocatalyst for the degradation of organics in shale gas brines. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Manpetch P, Singhapong W, Jaroenworaluck A. A comparative study of TiO 2 nanoparticles and Cu(II)/TiO 2 nanocomposites on photodegradation of cinnamic acid (CA) under natural sunlight and artificial UV light. J DISPER SCI TECHNOL 2022. [DOI: 10.1080/01932691.2022.2068568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Panlekha Manpetch
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - Wadwan Singhapong
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - Angkhana Jaroenworaluck
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
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