Special Issue "Photocatalytic Membrane Reactors"
Deadline for manuscript submissions: 31 August 2019
Prof. Dr. Raffaele Molinari
Department of Environmental and Chemical Engineering, Università della Calabria, 87036 Rende (CS), Italy
Interests: membrane processes; catalytic and photocatalytic membrane reactors; complexation reactions coupled with membranes (supported liquid membranes; ultrafiltration assisted by polymers); saving, recovery and recycle of matter and energy by membrane processes
Prof. Dr. Sylwia Mozia
West Pomeranian University of Technology, Szczecin, Faculty of Chemical Technology and Engineering, Institute of Inorganic Chemical Technology and Environment Engineering, ul. Pułaskiego 10, 70-322, Szczecin, Poland
Interests: inorganic chemical technology; water/wastewater treatment; membrane processes, especially pressure driven membrane techniques and membrane distillation; hybrid membrane processes; advanced oxidation processes; photocatalysis
Since Honda and Fujishima described their research on photocatalytic splitting of water on TiO2 electrodes (Nature, 1972), the interest of scientific world in various applications of photocatalysis has been systematically increased. It is commonly accepted that photocatalysis fits to the Green Chemistry principles allowing both removal of toxic compounds or synthesis of useful substances. The most commonly investigated applications of this process are air and water/wastewater purification in terms of degradation of organic contaminants to innocuous products, such as water, carbon dioxide or inorganic salts, as well as removal of toxic metals. The most recent attempt is utilization of photocatalysis in organic synthesis.
The advantages of photocatalysis can be significantly enhanced by coupling this process with membrane technology. Photocatalytic membrane reactors (PMRs) are hybrid systems of various configurations which combine photocatalysis with membrane separation taking advantages of both processes. PMRs have been found a promising tool for water/wastewater treatment and organic synthesis. Application of a membrane gives a possibility to realize a continuous operation with a simultaneous recovery of a photocatalyst (immobilized or in suspension), coupled with the photoreaction and separation of the substrates or (by)products from the reaction environment. Improvement of process efficiency compared to conventional photoreactors, modularity and easy scale up are some other potential advantages of PMRs. All of these resulted in a significant growth of interest in this area observed in the recent years. Nonetheless, the full-scale applications of PMRs still need detailed investigations to improve the processes performance. This Special Issue aims to cover all aspects of hybrid photocatalysis–membrane systems, including both photocatalytic membranes and reactors with suspended photocatalyst. Experimental and theoretical contributions being within the scope of this Special Issue, including original research papers, short communications and review articles are invited for submission.
Prof. Dr. Raffaele Molinari
Prof. Dr. Sylwia Mozia
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- Membrane separation
- Photocatalytic membrane reactor
- Photocatalytic membrane
- Immobilized photocatalyst
- Water treatment
- Wastewater treatment
- Organic photosynthesis
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Hybrid photocatalysis–membrane processes over the PVDF/ZnO nanocomposite membrane
Authors: Nurafiqah Rosmana,b, Wan Norharyati Wan Salleha,b, Ahmad Fauzi Ismaila,b
Affiliations: a Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.
b Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.
Corresponding author: W.N.W. Salleh ([email protected])
Abstract: The ZnO nanoparticles was successfully incorporated with mixed phase Ag2CO3/Ag2O via phase transformation route and found to be a visible light driven heterojunction photocatalyst. The photocatalytic efficiency of PVDF/ZnO/Ag2CO3/Ag2O was evaluated by the degradation of AZO dye, Reactive Red 12 (RR12) under UV and visible light irradiation at room temperature. The prepared PVDF/ZnO nanocomposite membrane were characterized by means of thermogravimetric (TGA), x-ray diffraction (XRD), transmission emission microscope (TEM) analysis, UV-Vis-NIR spectroscopy, photoluminescence (PL) and XPS Spectroscopy. The incorporation of mixed phase Ag2CO3/Ag2O with ZnO as heterojunction was observed to give a great influence on the photocatalytic membrane performance. The results indicated that the PVDF/ZnO/Ag2CO3/Ag2O nanocomposite membrane had displayed much higher photocatalytic performances as compared to pristine PVDF/ZnO nanocomposite membrane. The improvement in the photocatalytic activity under visible light could be attribute to the formation of new energy level due to mixed phase of Ag2CO3/Ag2O, narrower the band gap energy and improve electron-holes separation. Moreover, the resultants PVDF/ZnO/Ag2CO3/Ag2O nanocomposite membrane exhibited significant efficiency for the degradation of Reactive Red 12 (RR12) under 100W LED lamp.
Keywords: Hybrid photocatalysis–membrane; ZnO; Ag2CO3/Ag2O; nanocomposite; visible light
Title: Analysis of Performance Characteristics of an Oscillatory Membrane Photocatalytic Reactor
Authors: H. G. Gomaa and R. Sabouni(a)
Affiliation: Chemical and Biochemical Engineering Department, Western University London, ON, Canada, N6A 5B9
(a) Present address: Department of Chemical Engineering, American University of Sharjah, Sharjah, UAE.
Abstract: Experimental and theoretical analysis of the hydrodynamics and performance characteristics of an oscillatory membrane photocatalytic reactor are conducted using suspended ZnO and TiO2 photocatalysts. The investigation involved degradation of dyes and pharmaceuticals by-products micropollutants. The effect of hydrodynamics and design parameters on the system performance and its relation to the membrane-catalyst retention characteristics is evaluated using flat surface membranes as well as ones equipped transverse turbulence promoters (TP). The theoretical analysis was supported by the experimental results which showed that application of oscillatory motion resulted in enhancing the reactor photocatalytic performance by minimizing catalyst particles deposition on the membrane which increased its concentration in suspension. Such effect was further augmented by the increase in membrane permeate flux due to the lower hydraulic resistance caused by catalyst deposition on the membrane surface. Furthermore, application of oscillatory motion provided effective mixing in the reaction channel that minimized particles sedimentation and agglomeration, which further enhanced the catalyst suspension and increased its effective reaction area. Assessment of the specific energy consumption (kWh/m3) compared favourably to membrane cross flow filtration system, which when added to the smaller footprints of the oscillatory design configuration, could make the latter an attractive option for confined space applications for water and wastewater treatment applications. Such advantages however must be assessed in light of the design and maintenance requirements of the oscillatory mechanism in comparison to a conventional cross flow filtration membrane system.
Keywords: Photocatalysis, membranes, oscillatory motion
Title: A dialysis photocatalytic reactor for the green production of vanillin
Authors: G. Camera Rodaa, F. Parrinob, V. Loddob, L. Palmisanob
Affiliation: aDepartment of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy
bDipartimento di Energia, Ingegneria dell’Informazione e Modelli Matematici (DEIM), University of Palermo, viale delle Scienze Ed. 6, 90128 Palermo, Italy.
Abstract: In the present work, dialysis has been used to recover vanillin while it is phocatalytically produced by partial oxidation of ferulic acid in an aqueous solution at ambient temperature. The relatively high value of the permeate flux through a dense polyether-block amide membrane allows to continuously extract vanillin from the reacting solution thus avoiding its successive oxidation. The rate of reaction remains almost constant, because the ferulic acid, which is consumed by the reaction, is restored into the reactor by permeation through the membrane. The results obtained with a mathematical model, which accounts for the kinetics of the reaction and the transport of vanillin and ferulic acid into the upstream and downstream liquid phase and through the membrane, agree with the experimentally observed behavior. The model shows that concentration polarization might limit the process if the tangential velocity is not sufficiently high. The increase of the yield of production of vanillin is most important outcome obtained with this membrane reactor.