Special Issue "Recent Advances in TiO2 Photocatalysts"
Deadline for manuscript submissions: 30 November 2020.
Interests: Scientific: photochemistry, water and wastewater treatment, advanced oxidation processes, photodegradation, disinfection, solar disinfection, toxicity, mass spectroscopy, reactions of reactive oxygen species
Special Issues and Collections in MDPI journals
Interests: heterogeneous photocatalysis, environmental remediation technologies, nanotechnology, nanomaterials, nanobiomedicine, environmental protection, synthesis of quantum dots, metallic and semiconductors nanoparticles
Interests: chemical reaction engineering; effluents treatment; advanced oxidation processes; ozonation and photocatalytic ozonation; ecotoxicology and environmental chemistry; product recovery
Special Issues and Collections in MDPI journals
Interests: fate of micropollutants in aquatic environment, solar-driven degradation processes, identification of transformation products, wastewater treatment using photochemical processes
Chemical processes, such as advanced oxidation processes (AOPs), receive a lot of attention with respect to their application for water treatment purposes. Among these processes, semiconductor photocatalysis, especially with titanium dioxide (TiO2), has been studied in detail, also with regard to the elimination of selected micropollutants in water. This inexpensive, stable and non-toxic catalyst provides very good removal efficiencies. TiO2 photocatalysts have a great potential for application in the decontamination of wastewater, exhaust gases and disinfection. High-efficiency TiO2-based photocatalysts are also successfully used in photocatalytic water splitting and photoconversion, providing low cost and environmentally-friendly production of clean fuels. However, due to the energy band gap, the practicality of natural solar light employment is limited. Nowadays, the application of visible light in TiO2 photocatalysis is the main goal of research.
This Special Issue aims to report on recent progress and developments in methods promoting the visible light photocatalytic activity of TiO2, including metal and non-metal doping, surface deposition of noble metals, semiconductor coupling, and dye sensitizing. Furthermore, research into understanding the mechanism of photocatalysis, photocatalytic ozonation, as well as the photoconversion and water splitting will be important subjects for this Special Issue.
Prof. Dr. Marta Gmurek
Dr. Anna Malankowska
Prof. Dr. Rui C. Martins
Dr. Ewa Borowska
Manuscript Submission Information
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- homogeneous and heterogeneous photocatalysis
- photocatalytic ozonation
- visible light application
- mechanism investigation
- structure modification
- structure characterization
- water splitting
- hydrogen production
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.
Authors: Magnus Rønning
Affiliation: Department of Chemical Engineering, Norwegian University of Science and Technology
Title: The preparation and properties of TiO2-based nanosized photocatalysts
Authors: Ruzimuradov Olim Narbekovich
Affiliation: Turin Polytechnic University in Tashkent
Title: Catalyst Selection for Industrial Textile Wastewater Ozone Treatment
Authors: Lucyna Bilińska 1,*, Kazimierz Blus 1, Marta Gmurek 2 and Stanisław Ledakowicz 2
Affiliation: 1 Bilinski Factory Of Colour, Mickiewicza 29, 95-050 Konstantynow Lodzki, Poland; [email protected] 2 Faculty of Process & Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland; [email protected]
Abstract: Catalytic ozonation has appeared as one of the recent trends in textile wastewater treatment. The necessity of effective color removal in short treatment time is a standard when an industrial implementation is planned. At the same time, efficient COD and toxic by-products removal are highly expected. This study presents the results of an ozone treatment supported by three types of catalysts. A metal oxide (TiO2 as P-25 by Degussa), activated carbon (nano-powder by Sigma, AC) and metal particles (platinum, 1% wt. supported on AC matrix by Sigma, Pt-AC). The values of pseudo-first order constants of Reactive Black 5 (RB5) decolorization rate for catalytic ozonation with AC addition were between 0.039 ± 0.001 and 0.121 ± 0.001 min-1 (for pH in the range of 2 - 12). These values were transparently higher than corresponding values of single ozone treatment. Despite, the catalytic effect of AC was shown for the model wastewater (the RB5 solution), the real industrial wastewater revealed opposite behavior. The experiment ran for industrial wastewater, exposed a lack of catalytic action of every investigated catalyst. Additionally, the catalytic effect was not visible in COD removal. Based on these observations, a new mechanism of catalytic ozonation of textile wastewater was proposed.
Title: TiO2 Modified with Metal Sulphides for the Photocatalytic Degradation of Toluene in the Gas Phase
Authors: Anna Malankowska
Affiliation: University of Gdansk Faculty of Chemistry, Gdansk, Poland
Title: Selective Oxidation of Crude Glycerol to Dihydroxyacetone in a Biphasic Photoreactor
Authors: Alexander Imbault; Ramin Farnood
Affiliation: Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, Ontario, M5S 3E5, Canada
Abstract: In this paper, the first biphasic photoreactor is introduced and utilized for the conversion of glycerol to glyceraldehyde (GAD) and dihydroxyacetone (DHA). Comparing a system containing identical amounts of glycerol and photocatalyst the addition of an inactive phase increased the yield by a factor of 2 (6.5 % to 13 %) and increased the concentration of DHA after 240 min by more than a factor of 18 (0.08 mM to 1.5 mM ). Additionally, the biphasic photoreactor using crude glycerol yielded further benefits by removing impurities from the active phase allowing crude glycerol to have almost identical yield to ‘pure’ glycerol . In past work the yield of DHA from crude glycerol was found to be low due to impurities in crude glycerol poisoning the photocatalyst, the impurities were found to enter the inactive phase in the biphasic reactor. The mechanism of this phenomenon is further investigated to show that the benefits of the biphasic photoreactor do not come from either of the two phases individually. This paper details a widely applicable improvement that could be applied to photoreactors independent of the specific photocatalyst (or photoreaction with no photocatalyst), substrate or which two solvents are used. This opens the door to a host of improvements to a wide array of photoreactions by intelligently picking two immiscible solvents.
Title: Recent Advancement and Development in TiO2 based nanocomposite for degradation of organic pollutants via photocatalysis
Authors: Awais Ahmad1,6, Sobia Tabassum2, J.H.O. Nascimento3, Saad Maroof Saeed4, Abdur Rahim5, Syed Abbas Raza6and Ikram Ahmad1,6*
Affiliation: 1 Department of Chemistry, University of Lahore, 54590 Lahore Pakistan 2 Department of Biological Sciences, International Islamic University, Islamabad 32C2T - Center for Science and Textile Technology, Textile Engineering Department, School of Engineering, Campus Azurem 4Department of Phathalogy, Punjab Medical University Faisalabad,38000 Pakistan 5Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS University Islamabad, Lahore Campus, Pakistan. 6 Department of Applied Chemistry, Government College University Faisalabad,38000 Pakistan
Abstract: Titanium dioxide had get a very novel interest for scientist due to its promising applications as photcatalyst when any light source exposure on it as well as electrochemical sensor. Due to these potential applications this is the most intensely studied oxide and vastly use in different scientific fields such as in white pigments, degradation of organic pollutants, removal of heavy metals as well as in energy storage, etc. There had been an essential perquisite to remove hazardous materials from water for consumption by living organisms. In this review, we explained that how titanium oxide will work when it surface enhanced via nanotechnology towards photocatalytic activity. This review led to explain some novel recent advancement and development of titanium oxide nanocomposite for degradation of organic pollutants such as methylene blue, cango red, methyl orange, acridine orange etc. via adsorption mechanism under irradiation of light exposure. Titanium oxide had been use with different metals, natural polymer as well synthetic polymer to exhibit its photocatlytic property against pollutants. All the technical scientific issues have been addressed; highlighting the recent advancements.
Title: An Interdisciplinary Approach to Polymers and Photocatalysis - Challenges and their future prospects
Authors: Feroz Shaik1 and Murtuza Ali Syed2
Affiliation: 1* Prince Mohammad Bin Fahd University, Al Khobar, Kingdom of Saudi Arabia 2 National University of Science and Technology, Muscat, Sultanate of Oman
Abstract: Photocatalytic technology is playing a significant role in remediation of pollutants and generation of renewable energy (Hydrogen). Photocatalysts embedded functionalized polymers and their nanocomposites are gaining tremendous attention from academic research as well as industrial applications. Many interesting features allow the photocatalytic embedded polymers to stand out in the field of photocatalytic applications over standalone semi-conductor photocatalysts. This critical review summarizes the development and characterization of photocatalytic polymers, their applications, challenges, recent trends and their future prospects.
Title: Investigation of the Synergistic Effect of Ultraviolet Radiation and Sonocatalysis of Titanium Dioxide in Organic Dye Degradations
Authors: Yunseok Choi a,b, Dain Lee a, Sungje Hong c, Sovann Khan d, Burak Darya a, Jaewon Chung b* and So-Hye Cho a,d*
Affiliation: a Materials Architecturing Research Center, Korea Institute of Science & Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea b Department of Mechanical Engineering, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul 02841, Republic of Korea c Department of Nuclear Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA d Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan e Department of Nanomaterials Science and Engineering, Korea University of Science and Technology, 217 Gajeong-ro Yuseong-gu, Daejeon, 34113, Republic of Korea
Abstract: Ultraviolet (UV)-assisted sonocatalysis is one of the powerful advanced oxidation processes (AOPs) for polluted water treatment and titanium dioxide (TiO2) is the most widely used materials in the process. However, UV-assisted sonocatalysis by TiO2 is a very complicated process and hence its mechanism of pollutant degradation is not yet clearly understood. We were interested in the effect of light irradiation on sonocatalysis by TiO2 since TiO2 is renowned for its light-responsive catalytic activity towards dye degradation. We first examined the sonoluminescence generated by ultrasound sonication with various power, which was visible by photographic images in the dark and also a luminol indicator. Next, using eosin B as an organic dye, we compared its decomposition rates by sonocatalysis combined with photocatalysis vs. UV-assisted sonocatalysis (sonophotocatalysis) in the presence of TiO2 nanoparticles (P25) and calculated a synergy effect in percentage. It was found that the synergy effect is highly engaged with dye concentration and sonication power so that we repeated the comparison test in different concentrations of eosin B (0.55 and 2.19 mM) and different sonication powers (35.4, 106.1, and 176.8 W/cm2). At the low concentration of dye, it was found that the synergy effect was negative but at the high concentration, the synergy effect was close to zero, providing activity equal to a sum of each reaction. On the other hand, synergy effects were found highly dependent on sonication powers, which is considered due to different degrees of cavitation and turbulence generated by various powers prevailing the mass transfer of dye molecules to the surface of TiO2.
Title: Antimicrobial Activity Against Methicillin-resistant Staphylococcus Aureus Under Visible Radiation on Zn tetracarboxy-phthalocyanine Sensitized TiO2 Thin Films.
Authors: William Andres Vallejo Lozada
Affiliation: Grupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Puerto Colombia 81007, Colombia.
Abstract: In this work, we determined potential antimicrobial activity of TiO2 thin films sensitized by Zn tetracarboxy-phthalocyanines (TcPcZn). TiO2 thin films were deposited by Doctor Blade method and the sensitization process was carried out by chemisorption process. Properties of compounds were studied trough Fourier Transform infrared spectroscopy (FTIR), UV-Vis spectrophotometry, diffuse reflectance, Raman spectroscopy and scanning electronic microscopy (SEM). Finally, we study antimicrobial effect against Methicillin-resistant Staphylococcus aureus (MRSA) under visible irradiation. Spectroscopy analysis corroborated TcPcZn synthesis and adsorption process. on TiO2 and TcPcZn/TiO2; antimicrobial assay showed TcPcZn/TiO2 thin films reach 76.5% (±0.6) of inhibition of MRSA growth under visible irradiation.
Title: Exploring the photothermo-catalytic performance of Brookite TiO2-CeO2 composites
Authors: Bellardita Marianna, Fiorenza Roberto*, D'Urso Luisa, Scirè Salvatore, Palmisano Leonardo.
Affiliation: (B.M., P. L.) Dipartimento di Ingegneria, Università di Palermo, ed. 6, Viale delle Scienze, 90128 Palermo, Italy. (R.F., D.L., S.S) Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria 6, 95125 Catania, Italy.
Abstract: The thermo-catalytic, photo-catalytic and photothermo-catalytic oxidation of VOCs (2-propanol, ethanol and tolune) was investigated on Brookite TiO2-CeO2 composites. The multi-catalytic approach based on the synergistic effect between solar photocatalysis and thermocatalysis led to considerably decrease the conversion temperatures of the organic compounds. The presence of small amounts of cerium oxide allows to obtain efficient brookite-based composites facilitating the space charge separation and increasing the lifetime of the generated photoholes and electrons as confirmed by the characterization measurements. The possibility to concurrently utilize the photocatalytic properties of brookite and the redox properties of CeO2, both activated in the photothermal tests, is an attractive approach easily applicable to purify air from the volatile organic compounds.
Title: TiO2-Graphene Quantum Dot nanohybrids for photocatalysis in biomedical and energy applications
Authors: Anuja Bokare, Sowbaranigha Chinnusamy Jayanthi, Folarin Erogbogbo
Affiliation: San Jose State University
Abstract: Environmental issues like pollution, global warming and abnormal climate changes are causing irreversible damage to the planet. The use of solar energy via photocatalysis contributes towards environmentally harmonious, sustainable and energy efficient technology. TiO2 is one of the most widely used photocatalysts. However, the high band gap (low-usage of visible light) and fast recombination of the photo-generated charge carriers limit its overall photocatalytic activity. Graphene quantum dots are zero-dimensional materials which can act as electron transfer agents in photocatalytic reactions. Hence, when GQDs are combined with TiO2, the resulting hybrid can enhance photocatalytic activity in the visible light range while significantly reducing recombination reaction rates. This review encompasses several advancements made in the field of TiO2-GQD nanohybrid photocatalysis. These include: (1) various structural formulations and synthesis methods of GQD-TiO2 nanohybrids (2) the influence of GQD incorporation on the optical and photoelectrochemical properties of TiO2 nanostructures; (3) discourse about the mechanism behind the overall higher visible light photoactivities of these nanohybrids; and (4) the application of these nanohybrids in biomedical and energy conversion devices. The advances outlined in this review highlight the role that TiO2-GQD nanohybrids may play as an environmentally friendly photocatalyst.