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Bai Y, Shi X, Wang P, Wang L, Xie H, Li Z, Qu L, Ye L. Synthesis of one-dimensional Bi5O7Br0.5I0.5 solid solution for effective real oilfield wastewater treatment via exciton photocatalytic process. J Taiwan Inst Chem Eng 2018. [DOI: 10.1016/j.jtice.2018.05.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Facile fabrication of visible light-driven CeO2/PMMA thin film photocatalyst for degradation of CR and MO dyes. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3419-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Larsson M, Yousefi A, Elmas S, Lindén JB, Nann T, Nydén M. Electroactive Polyhydroquinone Coatings for Marine Fouling Prevention-A Rejected Dynamic pH Hypothesis and a Deceiving Artifact in Electrochemical Antifouling Testing. ACS OMEGA 2017; 2:4751-4759. [PMID: 31457758 PMCID: PMC6641732 DOI: 10.1021/acsomega.7b00485] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/04/2017] [Indexed: 06/10/2023]
Abstract
Nanometer-thin coatings of polyhydroquinone (PHQ), which release and absorb protons upon oxidation and reduction, respectively, were tested for electrochemically induced anti-biofouling activity under the hypothesis that a dynamic pH environment would discourage fouling. Antifouling tests in artificial seawater using the marine, biofilm-forming bacterium Vibrio alginolyticus proved the coatings to be ineffective in fouling prevention but revealed a deceiving artifact from the reactive species generated at the counter electrode (CE), even for electrochemical bias potentials as low as |400| mV versus Ag|AgCl. These findings provide valuable information on the preparation of nanothin PHQ coatings and their electrochemical behavior in artificial seawater. The results further demonstrate that it is critical to isolate the CE in electrochemical anti-biofouling testing.
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Affiliation(s)
- Mikael Larsson
- University
College London, UCL—Australia, 220 Victoria Square, Adelaide, South Australia 5000, Australia
- Future
Industries Institute, University of South
Australia, Mawson
Lakes, South Australia 5095, Australia
| | - Ali Yousefi
- Future
Industries Institute, University of South
Australia, Mawson
Lakes, South Australia 5095, Australia
- Department
of Chemistry, Faculty of Science, Tarbiat
Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Sait Elmas
- Future
Industries Institute, University of South
Australia, Mawson
Lakes, South Australia 5095, Australia
| | - Johan B. Lindén
- Future
Industries Institute, University of South
Australia, Mawson
Lakes, South Australia 5095, Australia
| | - Thomas Nann
- The
MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington 6140, New Zealand
| | - Magnus Nydén
- University
College London, UCL—Australia, 220 Victoria Square, Adelaide, South Australia 5000, Australia
- Future
Industries Institute, University of South
Australia, Mawson
Lakes, South Australia 5095, Australia
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Teh SJ, Yeoh SL, Lee KM, Lai CW, Abdul Hamid SB, Thong KL. Effect of reduced graphene oxide-hybridized ZnO thin films on the photoinactivation of Staphylococcus aureus and Salmonella enterica serovar Typhi. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 161:25-33. [PMID: 27203568 DOI: 10.1016/j.jphotobiol.2016.05.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 05/10/2016] [Indexed: 11/25/2022]
Abstract
The immobilization of photocatalyst nanoparticles on a solid substrate is an important aspect for improved post-treatment separation and photocatalyst reactor design. In this study, we report the simple preparation of reduced graphene oxide (rGO)-hybridized zinc oxide (ZnO) thin films using a one-step electrochemical deposition, and investigated the effect of rGO-hybridization on the photoinactivation efficiency of ZnO thin films towards Staphylococcus aureus (S. aureus) and Salmonella enterica serovar Typhi (S. Typhi) as target bacterial pathogens. Field-emission scanning electron microscopy (FESEM) revealed the formation of geometric, hexagonal flakes of ZnO on the ITO glass substrate, as well as the incorporation of rGO with ZnO in the rGO/ZnO thin film. Raman spectroscopy indicated the successful incorporation of rGO with ZnO during the electrodeposition process. Photoluminescence (PL) spectroscopy indicates that rGO hybridization with ZnO increases the amount of oxygen vacancies, evidenced by the shift of visible PL peak at 650 to 500nm. The photoinactivation experiments showed that the thin films were able to reduce the bacterial cell density of Staph. aureus and S. Typhi from an initial concentration of approximately 10(8) to 10(3)CFU/mL within 15min. The rGO/ZnO thin film increased the photoinactivation rate for S. aureus (log[N/No]) from -5.1 (ZnO) to -5.9. In contrast, the application of rGO/ZnO thin film towards the photoinactivation of S. Typhi did not improve its photoinactivation rate, compared to the ZnO thin film. We may summarise that (1) rGO/ZnO was effective to accelerate the photoinactivation of S. aureus but showed no difference to improve the photoinactivation of S. Typhi, in comparison to the performance of ZnO thin films, and (2) the photoinactivation in the presence of ZnO and rGO/ZnO was by ROS damage to the extracellular wall.
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Affiliation(s)
- Swe Jyan Teh
- Nanotechnology and Catalysis Research Centre, Institute of Graduate Studies, University of Malaya, Malaysia
| | - Soo Ling Yeoh
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Malaysia
| | - Kian Mun Lee
- Nanotechnology and Catalysis Research Centre, Institute of Graduate Studies, University of Malaya, Malaysia
| | - Chin Wei Lai
- Nanotechnology and Catalysis Research Centre, Institute of Graduate Studies, University of Malaya, Malaysia
| | - Sharifah Bee Abdul Hamid
- Nanotechnology and Catalysis Research Centre, Institute of Graduate Studies, University of Malaya, Malaysia.
| | - Kwai Lin Thong
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Malaysia.
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