photocatalysis Articles
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Synthesis of titania particles with high photocatalytic activity by high–temperature hydrolysis of TTIP in gas phase
Recently, the photocatalytic activity of titania has attracted considerable attention for solving various environmental problems. Photocatalysis is considered to be effective in air purification, water purification, and used for dealing with various types of environmental pollution. The smaller the particle size of titania, the faster the photocatalysis proceeds. Since our previous study revealed ...
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Surface characterisations and photocatalytic property of MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanoparticles
MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanocrystalinee synthesised by a salt aqueous solution reaction show similar nanoparticle size, good ultraviolet-visible light absorption and narrow bandgap energy. The oxidation-reduction potential of methyl orange aqueous solution with initial pH = 5−7 is positively varied as presence of the nanoparticles in ultraviolet-visible light irradiation, ...
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Photocatalytic degradation of MC-LR in water by the UV/TiO2/H2O2 process
The ultraviolet (UV)/titanium dioxide (TiO2)/hydrogen peroxide (H2O2) process (UTHP) has been proven to be effective in removing organics because of its high production of free radicals. In this study, UTHP was further investigated for the photocatalytic degradation of microcystin-LR (MC-LR). Results showed that three mechanisms could realize MC-LR photocatalytic degradation using TiO2. H2O2 ...
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Immobilisation of TiO2 for combined photocatalytic-biological azo dye degradation
The biodegradability of the azo dye Remazol Red RR (100 mg/l) was evaluated using unadapted activated sludge and the experiment confirmed the recalcitrance of the dye. Using a combination of photocatalysis and an aerobic biological step, the biodegradability was improved significantly and complete removal of both colour and COD were achieved. Furthermore, TiO2 was successfully immobilised on ...
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Visible–light photocatalytic activities of ?VO
3nanorods and BiVO4nanobarsMonoclinic ?–AgVO3 nanorods (thickness 30 nm) and monoclinic BiVO4 nanobars (thickness 15 nm) with high aspect ratio are prepared by controlling the reaction kinetics of room temperature precipitation, without using any capping agents or surfactants. The nanocrystalline vanadates are characterised using XRD, SEM, EDAX, FESEM, TEM and AFM. Possible growth mechanisms of the nanocrystals are ...
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Biofiltration of hydrophobic VOCs pretreated with UV photolysis and photocatalysis
The effects of pretreatments on the biofiltration of gas phase α-pinene, a poorly water soluble Volatile Organic Compound (VOC), was evaluated in a controlled and long-term experimental investigation. Ultraviolet (UV) photolysis and photocatalysis were used and compared as pretreatment techniques. A control experiment involving biofiltration alone allowed for the direct evaluation of the coupled ...
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Photoelectrocatalytic activity for water treatment of TiO2/Ti electrodes prepared by anodization
TiO2 electrodes are made by anodization of Ti at various applied voltages. The increase of voltage facilitates the generation of anatase and rutile at high potential (superior to 140 V). Photoelectrochemical properties of prepared electrodes are investigated with and without methanol. TiO2/Ti electrode obtained at 140 V presents high photoelectrochemical properties. The electrode presents better ...
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Design of new M@ZnO nanocolloids: synthesis and shaping
This contribution consists in a microreview of our research activities for the last three years period concerning the synthesis and characterisation of M@ZnO nanocolloids with M = Ti, Eu, Co and [Mo6Br14]2−. Using, these different 'polymeric' nanocolloids, thanks to the high concentration, we demonstrate the possibility to prepare various functional nanomaterials like gels, nanosized powders or ...
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Protective action of antioxidants against amino acids degradation caused by free radicals
It is known that, in the human body, disequilibrium between free radical production and the human system defence, based on enzymatic and antioxidants actions, can produce an oxidative stress status and bring about a biochemical modification and a pathological status. Free radicals cannot be eliminated from the organism because they are continuously produced, but it is possible to control their ...
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Visible-light assisted methylene blue (MB) removal by novel TiO2/adsorbent nanocomposites
In present work, visible light sensitive TiO2/adsorbent nanocomposites (TNC) were prepared via a facile wet chemical method. Three types of adsorbents including zeolites (F-9, HSZ-690 and HSZ-930), mesoporous silica (MPS-2.7 and 4) and activated carbon, were used as the porous substrates for nanocomposites. Visible light sensitivity was incorporated to TNCs by nitrogen doping of TiO2, which is ...
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Evaluation of model parameters for simulating TiO2 coated UV reactors
A CFD-based model for simulating TiO2 coated photocatalytic reactors used in drinking water treatment applications was preliminarily evaluated. The model includes aspects of hydrodynamics, mass transfer, UV-radiation field, and surface chemical reactions. Appropriate models for each of the associated physicochemical phenomena were experimentally or analytically examined. Once defined and ...
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Effect of adsorption on the photocatalysis performance of anthraquinone dye
The adsorption and photocatalytic efficiency of several TiO2 suspended catalysts were compared to see how well they could degrade the organic pollutant anthraquinone dye Reactive Blue 2 (RB2). The adsorption of RB2 on catalysts follows the Langmuir model and adsorption capacity's influence on degradation performance has been established. Correlations between degradation kinetics and the amount of ...
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Characterization and activity of visible-light driven TiO2 photocatalyst doped with tungsten
This research aimed to expand the activity of TiO2 down to the visible light region by modifying the sol-gel conditions and doping with tungsten. The optimum conditions for calcination temperature, acid type, and heating rate were 200°C, HNO3, and 1°C/min, respectively. The undoped TiO2 synthesized under these conditions could significantly absorb the visible light whereas the commercial Degussa ...
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CO2 utilisation by photocatalytic conversion to methane and methanol
In this paper we intend to give a broad overview of natural and artificial photosynthesis systems. We point out seven orders of magnitude difference of the rates of water splitting between natural and state of the art artificial photosynthesis in favour of natural photosynthesis. We reviewed the open literature for photocatalytic water splitting, CO2 reduction and suggested routes for ...
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A novel synthesis method for TiO2 particles with magnetic Fe3O4 cores
TiO2@(AC/Fe3O4) (AC is activated carbon) was prepared by using AC and Fe3O4 as joint support. The morphological features, crystal structure, and magnetism of the final product were characterized. The results indicate that TiO2 particles formed on the surface of AC and Fe3O4; the sizes of TiO2 and Fe3O4 were 0.5 and 0.7 μm respectively, and that of AC fell within a wide range. The highly ...
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Evaluation of the after-effects of cyanobacterial cell removal and lysis by photocatalysis using Ag/AgBr/TiO2
This study aimed to evaluate the after-effects of cyanobacterial cell removal and lysis by photocatalysis in water. A low concentration of 50 mg/L Ag/AgBr/TiO2 was applied to inactivate Microcystis aeruginosa under visible light irradiation. Most of the M. aeruginosa was killed within 5 h while microcystins-LR (MC-LR) was released into water and accumulated to a high concentration of 100 ...
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Superiority of solar Fenton oxidation over TiO2 photocatalysis for the degradation of trimethoprim in secondary treated effluents
The overall aim of this work was to examine the degradation of trimethoprim (TMP), which is an antibacterial agent, during the application of two advanced oxidation process (AOP) systems in secondary treated domestic effluents. The homogeneous solar Fenton process (hv/Fe2+/H2O2) and heterogeneous photocatalysis with titanium dioxide (TiO2) suspensions were tested. It was found that the ...
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Preparation, characterisation and testing of photocatalytic polymeric membranes with entrapped or suspended TiO2
Various cellulose triacetate (CTA) or polysulfone (PSf) membranes with entrapped polycrystalline TiO2 were prepared by using different methods of the so-called phase inversion process. Porosity and permeability of the membranes increased by increasing the amount of entrapped TiO2 while rejection decreased. The photoactivity of entrapped TiO2 for the degradation of congo-red was compared with that ...
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Kinetics of the TiO2-catalysed photodegradation of reactofix navy blue 2GFN dye
UV-irradiated TiO2-catalysed as well as uncatalysed photodegradation of the dye, reactofix navy blue 2GFN, has been studied under various reaction conditions. The kinetics have been followed at 603 nm, the λmax of the dye, in the visible region. The rate of the reaction depends on [dye] and [O2], and on [TiO2] when its concentration is below 0.2 g L-1. On increasing [TiO2] beyond 0.2 g L-1, ...
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Photo-degradation of butyl parahydroxybenzoate by using TiO2-supported catalyst
The present work evaluates the potential of the photocatalysis (PC) process for the degradation of butylparaben (BPB). Relatively high treatment efficiency was achieved by comparison to photochemical process. Prior to photocatalytic degradation, adsorption (AD) of BPB occurred on the titanium dioxide (TiO2)-supported catalyst. AD was described by Langmuir isotherm (KL = 0.085 L ...
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