Imperial College London
Alternate

ProfessorDominikWeiss

Faculty of Engineering, Department of Earth Science & Engineering

Professor of Environmental Geochemistry
 
 
 
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Contact

 

+44 (0)20 7594 6383d.weiss

 
 
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Location

 

2.39Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Bullen:2022:10.1002/chem.202104181,
author = {Bullen, JC and Heiba, HF and Kafizas, A and Weiss, DJ},
doi = {10.1002/chem.202104181},
journal = {Chemistry: A European Journal},
title = {Parasitic light absorption, rate laws and heterojunctions in the photocatalytic oxidation of arsenic(III) using composite TiO2/Fe2O3},
url = {http://dx.doi.org/10.1002/chem.202104181},
volume = {28},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Composite photocatalyst-adsorbents such as TiO2/Fe2O3 are promising materials for the one-step treatment of arsenite contaminated water. However, no previous study has investigated how coupling TiO2 with Fe2O3 influences the photocatalytic oxidation of arsenic(III). Herein, we develop new hybrid experiment/modelling approaches to study light absorption, charge carrier behaviour and changes in the rate law of the TiO2/Fe2O3 system, using UV-Vis spectroscopy, transient absorption spectroscopy (TAS), and kinetic analysis. Whilst coupling TiO2 with Fe2O3 improves total arsenic removal by adsorption, oxidation rates significantly decrease (up to a factor of 60), primarily due to the parasitic absorption of light by Fe2O3 (88% of photons at 368 nm) and secondly due to changes in the rate law from disguised zero-order kinetics to first-order kinetics. Charge transfer across this TiO2-Fe2O3 heterojunction is not observed. Our study demonstrates the first application of a multi-adsorbate surface complexation model (SCM) towards describing As(III) oxidation kinetics which, unlike Langmuir-Hinshelwood kinetics, includes the competitive adsorption of As(V), and we further highlight the importance of parasitic light absorption and catalyst fouling when designing heterogeneous photocatalysts for As(III) remediation.
AU  - Bullen,JC
AU  - Heiba,HF
AU  - Kafizas,A
AU  - Weiss,DJ
DO  - 10.1002/chem.202104181
PY  - 2022///
SN  - 0947-6539
TI  - Parasitic light absorption, rate laws and heterojunctions in the photocatalytic oxidation of arsenic(III) using composite TiO2/Fe2O3
T2  - Chemistry: A European Journal
UR  - http://dx.doi.org/10.1002/chem.202104181
UR  - https://www.ncbi.nlm.nih.gov/pubmed/35114042
UR  - https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/chem.202104181
UR  - http://hdl.handle.net/10044/1/95124
VL  - 28
ER  -
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