Development and assessment of photo-catalytic membranes for water purification using solar radiation

Coto, Michael; Troughton, S.C.; Duan, Jiaqi; Kumar, R. Vasant; Clyne, T.W.

doi:10.1016/j.apsusc.2017.10.027

Cited by 28 publications

(10 citation statements)

References 42 publications

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“…[ 51 ]. MB decomposition is one of the most popular test reactions used as a reference in determining the photoactivity of semiconductor and nanoscale materials [ 52 , 53 , 54 , 55 ]. In this study, the effects of dye concentration, sample exposure time, and temperature on the catalytic activity of composite Ag/PET TeMs along with the stability of catalysts’ properties were investigated.…”

Section: Resultsmentioning

confidence: 99%

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

et al. 2021

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In this study, the use of composite track-etched membranes (TeMs) based on polyethylene terephthalate (PET) and electrolessly deposited silver microtubes (MTs) for the decomposition of toxic phenothiazine cationic dye, methylene blue (MB), under visible light was investigated. The structure and composition of the composite membranes were elucidated by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction technique. Under visible light irradiation, composite membrane with embedded silver MTs (Ag/PET) displayed high photocatalytic efficiency. The effects of various parameters such as initial dye concentration, temperature, and sample exposure time on the photocatalytic degradation process were studied. The decomposition reaction of MB was found to follow the Langmuir–Hinshelwood mechanism and a pseudo-first-order kinetic model. The degradation kinetics of MB accelerated with increasing temperature and activation energy, Ea, was calculated to be 20.6 kJ/mol. The reusability of the catalyst was also investigated for 11 consecutive runs without any activation and regeneration procedures. The Ag/PET composite performed at high degradation efficiency of over 68% after 11 consecutive uses.

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Section: Resultsmentioning

confidence: 99%

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

et al. 2021

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“…The pseudo first order rate constant of the dye degradation was calculated using the Langmuir-Hinshelwood equation:ln(CC0)=−kt where C 0 is the initial concentration of dye, C is the concentration in mmol/L at time t (min), and k (min −1 )is the rate constant [11].…”

Section: Methodsmentioning

confidence: 99%

Proof of Concept for Light Conducting Membrane Substrate for UV-Activated Photocatalysis as an Alternative to Chemical Cleaning

et al. 2018

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Adopting an effective strategy to control fouling is a necessary requirement for all membrane processes used in the water/wastewater treatment industry to operate sustainably. The use of ultraviolet (UV) activated photocatalysis has been shown to be effective in mitigating ceramic membrane fouling by natural organic matter. The widely used configuration in which light is directed through the polluted water to the membrane’s active layer suffers from inefficiencies brought about by light absorption by the pollutants and light shielding by the cake layer. To address these limitations, directing light through the substrate, instead of through polluted water, was studied. A UV conducting membrane was prepared by dip coating TiO2 onto a sintered glass substrate. The substrate could successfully conduct UV from a lamp source, unlike a typical alumina substrate. The prepared membrane was applied in the filtration of a humic acid solution as a model compound to study natural organic matter membrane fouling. Directing UV through the substrate showed only a 1 percentage point decline in the effectiveness of the cleaning method over two cleaning events from 72% to 71%, while directing UV over the photocatalytic layer had a 9 percentage point decline from 84% to 75%. Adapting the UV-through-substrate configuration could be more useful in maintaining membrane functionality during humic acid filtration than the current method being used.

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“…As with bioactivity, this has been known for a long time and the possibility of a Ti PEO surface being attractive (in view of its high specific surface area, and its potential for the creation of robust membrane structures) was proposed some time ago. There have been many investigations [141][142][143][144][145][146][147], with the potential now well established. Among relevant features is that the anatase phase is more effective than rutile [148] and there have been studies [149] in which efforts have been made to raise the anatase content of PEO coatings, with this effect in mind.…”

Section: Photo-catalytic Usage Of Ti-based Peo Coatingsmentioning

confidence: 99%

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Clyne

Troughton

2018

International Materials Reviews

414

225

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The review describes recent progress on understanding and quantification of the various phenomena that take place during plasma electrolytic oxidation, which is in increasing industrial use for production of protective coatings and other surface treatment purposes. A general overview of the process and some information about usage of these coatings are provided in the first part of the review. The focus is then on the dielectric breakdown that repeatedly occurs over the surface of the work-piece. These discharges are central to the process, since it is largely via the associated plasmas that oxidation of the substrate takes place and the coating is created. The details are complex, since the discharge characteristics are affected by a number of processing variables. The interrelationships between electrical conditions, electrolyte composition, coating microstructure and rates of growth, which are linked via the characteristics of the discharges, have become clearer over recent years and these improvements in understanding are summarised here. There is considerable scope for more effective process control, with specific objectives in terms of coating performance and energy efficiency, and an attempt is made to identify key points that are likely to assist this.

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Development and assessment of photo-catalytic membranes for water purification using solar radiation

Cited by 28 publications

References 42 publications

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

Application of Silver-Loaded Composite Track-Etched Membranes for Photocatalytic Decomposition of Methylene Blue under Visible Light

Proof of Concept for Light Conducting Membrane Substrate for UV-Activated Photocatalysis as an Alternative to Chemical Cleaning

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

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