An easy and efficient use of TiO2 supported HZSM-5 and TiO2+HZSM-5 zeolite combinate in the photodegradation of aqueous phenol and p-chlorophenol

Durgakumari, Valluri; Subrahmanyam, M.; Rao, K. V. Subba; Ratnamala, A.; Noorjahan, M; Tánaka, Keiichi

doi:10.1016/s0926-860x(02)00224-7

Cited by 132 publications

(44 citation statements)

References 14 publications

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“…The strong adsorption of the pollutants over the activated carbon was the main reason pointed by the authors to explain the occurred phenomenon. Recently, porous non-metal minerals have been taken into account as supports of TiO 2 -based photocatalysts, such as perlite, zeolite and diatomite due to their low costs [11][12][13][14]. The use of porous minerals as support induces a synergistic effect by improving the photo-efficiency of the immobilized TiO 2 NPs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Wang

Godoi

Sun

et al. 2015

Journal of Colloid and Interface Science

120

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Diatomite, a porous non-metal mineral, was used as support to prepare TiO 2 /diatomite composites by a modified sol-gel method. The as-prepared composites were calcined at temperatures ranging from 450 to 950 o C. The characterization tests included X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with an energy-dispersive X-ray spectrometer (EDS), High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption/desorption measurements. The XRD analysis indicated that the binary mixtures of anatase and rutile exist in the composites. The morphology analysis confirmed the TiO 2 particles were uniformly immobilized on the surface of diatom with a strong interfacial anchoring strength, which leads to few drain of photocatalytic components during practical applications. In further XPS studies of hybrid catalyst, we found the evidence of the presence of Ti-O-Si bond and increased percentage of surface hydroxyl. In addition, the adsorption capacity and photocatalytic activity of synthesized TiO 2 /diatomite composites were evaluated by studying the degradation kinetics of aqueous Rhodamine B under UV-light irradiation.The photocatalytic degradation was found to follow pseudo-first order kinetics according to the Langmuir-Hinshelwood model. The preferable removal efficiency was observed in composites by 750 o C calcination, which is attributed to a relatively 2 appropriate anatase/rutile mixing ratio of 90/10.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Wang

Godoi

Sun

et al. 2015

Journal of Colloid and Interface Science

120

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“…Although the deposition of small amounts of Pt on TiO 2 catalysts is known to enhance their photocatalytic reactivity [25][26][27][28][29], Pt is too costly for common use in home electrical appliances. Meanwhile, the hybridization of adsorbents such as zeolites or mesoporous materials [14][15][16][17][18][19][30][31][32][33][34] with TiO 2 particles has been reported to show elevated photocatalytic reactivity. In a previous report [35], TiO 2 nano-particles hybridized with siliceous zeolites prepared by impregnation as well as a simple mechanical blending method showed higher photocatalytic reactivity for the complete oxidation of gaseous acetaldehyde than TiO 2 catalysts since such siliceous zeolites can efficiently condense acetaldehyde diffused in the gas phase and smoothly supply them onto TiO 2 photocatalyst surfaces.…”

Section: Introductionmentioning

confidence: 99%

Application of Highly Functional Ti-Oxide-Based Photocatalysts in Clean Technologies

et al. 2009

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Various Ti-oxide based photocatalysts such as the highly dispersed Ti-oxide species within zeolite frameworks, TiO 2 nano-particles hybridized with hydrophobic zeolite adsorbents as well as visible light responsive TiO 2 thin films have been successfully prepared. Characterization studies at the molecular level, such as X-ray absorption fine structure (XAFS) and photoluminescence (PL), revealed that the highly dispersed Ti-oxide species within the nano-spaces of zeolites possess a tetrahedral coordination and that they demonstrate unique and high performance for the photocatalytic decomposition of NOx and the photocatalytic reduction of CO 2 with H 2 O. A high photocatalytic reactivity for the TiO 2 semiconducting photocatalysts could be achieved by blending them with hydrophobic siliceous zeolites which was equal to the performance of TiO 2 deposited with expensive Pt particles. The role of the siliceous zeolites can be described as a so-called ''catch and release effect of organic compounds'', i.e., (i) the condensation of the reactants within the hydrophobic cavities of zeolites and; (ii) the efficient diffusion of the reactant onto the TiO 2 photocatalytic sites. Furthermore, a novel photocatalytic system which can convert abundant solar energy into renewable H 2 energy by the decomposition of H 2 O into H 2 and O 2 can also be achieved by using visible light responsive TiO 2 thin film photocatalysts prepared by a RF-magnetron sputtering deposition method. The conversion efficiency of solar energy into H 2 energy may be estimated at ca. 0.1% from the initial rate of H 2 evolution.

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“…On the contrary, for the TiO 2 /HY systems, the edge is red-shifted and the shift increases as the TiO 2 loading increases. This is likely due to the high degree of dispersion of the anatase aggregates within the zeolite [52][53][54].…”

Section: Characterization Of the Photocatalystsmentioning

confidence: 99%

Fe-Doped TiO2 Supported on HY Zeolite for Solar Photocatalytic Treatment of Dye Pollutants

et al. 2017

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Zeolite-supported TiO 2 and Fe-doped TiO 2 /zeolite photocatalysts were synthesized, aiming at improving the adsorption properties of the microporous support towards polluting dyes and the photocatalytic performance of TiO 2 in the treatment of the adsorbed organics. The TiO 2 /HY zeolite catalyst exhibited the best performance in the photocatalytic degradation of methylene blue, MB, over 10 wt% TiO 2 /HY under UV light at 254 nm. The addition of Fe species in the synthesis mixture led to Fe-TiO 2 /HY catalyst. The combination of adequate zeolite, good titanium dioxide dispersion, and Fe doping led to a remarkable performance in the degradation of the model dye. Over a 10 wt% Fe-doped TiO 2 /HY catalyst a total removal of MB (>98%) was achieved after 60 min under very mild conditions and simple visible light irradiation.

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An easy and efficient use of TiO2 supported HZSM-5 and TiO2+HZSM-5 zeolite combinate in the photodegradation of aqueous phenol and p-chlorophenol

Cited by 132 publications

References 14 publications

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Application of Highly Functional Ti-Oxide-Based Photocatalysts in Clean Technologies

Fe-Doped TiO2 Supported on HY Zeolite for Solar Photocatalytic Treatment of Dye Pollutants

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