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Synthesis of mesoporous TiO2 particles using ionic liquid (IL)-assisted sol-gel method was investigated. The product was analyzed and characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), and N2 adsorption and desorption. The products revealed higher photo catalytic activities than that of the commercially available TiO2, Degussa P25 in the photo degradation of methylene...
Summary form only given. For chemical reactions occurring on the surfaces, e.g., catalysis and photocatalysis, design and fabrication of structures in two different scales, i.e., angstrom/nanometer and micrometer ranges. The former regulates the adsorption and surface reaction of molecules, while the latter gives influence on the diffusion and mechanical strength of the material. In order to control...
Macroporous TiO2 with mesocellular foam structure was prepared using eggshell membrane as a single template. The as-synthesized catalyst was characterized by N2 adsorption-desorption analysis, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) analysis. The results indicate that hierarchical porous structure exists in the as-synthesized TiO2 membrane. The mesocellular foam is composed...
An aim in study volatile organic compound (VOCs) emission is to improve indoor air quality. VOCs are the major indoor air pollutants, this paper introduced the types ,sources and characteristics of pollution caused by VOCs in indoor air, and effect of VOCs on human health were presented. The pollution from sources, adsorption technology and photocatalytic oxidation technology ect. In order to understand...
TiO2 catalyst was prepared by two kinds of different methods. The photocatalytic activity of TiO2 prepared by the hydrothermal method is 2.5 times higher than that by sol-gel in degradation dimethyl phthalate (DMP). The combined photocatalysis with UV irradiation and ozonation (TiO2/UV/O3) process considerably improved mineralization and degradation of dibutyl phthalate compared to combined photocatalysis...
Abstract-This study aimed at improving the photocatalytic oxidation of humic acids (HA) in α-Fe2O3suspensions by adding calcium cationic ion (Ca2+). A visible light photocatalyst of α-Fe2O3 was prepared by co-precipitation method and characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). First a set of tests was conducted in the dark to study the adsorption of HA onto α-Fe...
The photocatalysts of TiO2 nanoparticles coated on rice husk ash were prepared by the sol-gel method,which were characterized by XRD and TEM.The photocatalysts degradation of the pollutants in waste water of chromium.The results show that if the content of the Cr(VI) in waste water is 50mg·L-1 with the titania as adsorbent, the removal rate of Cr(VI) will reach 85%, which is obviously higher than...
Nanoporous SnO2 with high photocatalytic activity has been successfully prepared by a photochemical method. The as-synthesized sample was characterized by XRD, N2 adsorption-desorption, TEM, UV/vis and FTIR. The photocatalytic activity of the sample was evaluated by the decomposition of methyl orange(MO) aqueous solution under different light source(UV, sunlight and visible light) and was compared...
Mesoporous, nitrogen-doped TiO2 (TiO2-xNx) nano-crystal is potentially technologically important materials due to its developed porosity and visible-light responsive performance. These are important parameters for photocatalysis and dye sensitized solar cells (DSSCs) with regard to adsorption and conversion of solar energy efficiency. We have recently developed an effective solvent evaporation induced...
A novel photocatalyst (Bi20TiO32) was synthesized by chemical solution decomposition (CSD) and it was calcined at the temperature of 300??C. It exists in nanosheets with a diameter around 90 nm. The as-prepared Bi20TiO32 is visible-light responsive (up to 500nm in wavelength) without sacrificing its ability for absorbing UV light. The specific activity of Bi20TiO32 is higher than anatase TiO2 under...
The adsorption and photodecomposition of diphenolic acid (DPA) was investigated in the presence of alpha- or beta- cyclodextrins (CDs) and TiO2 suspensions. The adsorption of DPA on TiO2 surface and inclusion complex of CDs and DPA were critical factor in the photocatalytic reaction. Results showed that, the adsorption isotherms of DPA could be plotted with the Langmuir isotherm model, and the maximum...
Research on treatment for chloride of desulphurization wastewater by nano-TiO2 is conducted and based on nano-TiO2 dioxide characteristics of adsorption and photo-catalysis. Some affecting factors on the removal efficiency were also studied, such as different dosage, mixing time, pH value of the solution and light time. The catalysis mechanisms of nano-TiO2 on chloride removal efficiency were discussed...
The Zn2+-La3+Co-doped TiO2 photocatalysts prepared by doping lanthanum ion and zinc ion into TiO2 structure in a sol-gel process were shown to be efficient photocatalyst for the purification of Indoor air.The catalyst samples were then characterized by XRD and UV-vis analyses. The analytical results demonstrated that the lanthanum- zinc co-doping could inhibit the phase transformation of TiO2 and...
This paper investigated the photochemical behavior of diphenolic acid (DPA) in the presence of beta-cyclodextrin (CD) and TiO2 suspensions under a 250 W metal halide lamp (lambdages 365 nm). The interaction of DPA with CD yielded the formation of inclusion complexes at 1:1 stoichiometric ratio in solution. The irradiation of DPA and TiO2 suspensions in the presence of beta-CD showed that the photodegradation...
Chitosan capped CdS (CdS/CS) composite was prepared by biomimetic synthesis method under mild conditions. Visible light photocatalytic decolorization of Methyl Orange (MO) was carried out by employing this innovative composite catalyst. Effect of catalyst amount, initial dye concentration, irradiation time, pH value, inorganic ions and reuse of the catalyst on decolorization was investigated. The...
In this work nanocrystalline titanium dioxide thin films doped with Eu have been presented. Structural investigation results have shown that amount of Eu in TiO2 matrix has meaningful influence on properties of the thin films, particularly on TiO2 phase and grain sizes. Our measurements have shown that Eu increases photocatalytic activity of TiO2. Eu also has high influence on adsorption of OH- groups...
Bovine serum albumin (BSA) was space selectively immobilized onto a quartz substrate using photo-reactions initiated by pulsed laser irradiation of benzophenone derivatives tethered by silane coupling to the quartz. The excitation of the benzophenone with 266 nm light yields the pi-pi* triplet state with a quantum yield of 1. This triplet state then reacts with BSA in buffer solution in contact with...
The mechanisms of the interaction of a gas-discharge plasma and vacuum ultraviolet (VUV) radiation with medical polymers were considered. Various techniques were proposed for the use of plasma-chemical and photochemical processes for enhancing the biocompatibility of medical polymers. The functionalization and regulation of the biological characteristics of medical polymers was achieved by plasma...
Photochemical oxidation of thiophene in n-octane/acetonitrile extraction system using O2 as oxidant was studied. Results obtained here can be used as the reference for the oxidative desulfurization of gasoline because thiophene is one of the main components containing sulfur in fluid catalytic cracking gasoline. A 500 w high-pressure mercury lamp was used as light source for irradiation and air was...
Research on treatment for desulphurization wastewater by nano-titanium dioxide is conducted and based on nano-titanium dioxide characteristics of adsorption and photo-catalysis, some affecting factors on the removal efficiency were also studied, such as different dosage, mixing time, pH value of the solution and light time. The catalysis mechanisms of nano-titanium oxide on fluoride and sulfide removal...
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