Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites

Xue, Gang; Liu, Huanhuan; Chen, Quanyuan; Hills, Colin D.; Tyrer, Mark; Innocent, Francis

doi:10.1016/j.jhazmat.2010.11.063

Cited by 180 publications

(95 citation statements)

References 42 publications

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“…A similar value of HA adsorption on TiO 2 was obtained by Dziedzic et al 8 , whereas the other researchers reported the lower values, from 0.7 to 23 mg/g photocatalyst 5, 7 . It was reported that adsorption of HA is favored in acid conditions and decreases with the increasing of the pH of the solution [6][7][8] . In our experiment we used the natural pH of HA solution, which was around 6.6.…”

Section: Photocatalytic Decomposition Of Hasupporting

confidence: 79%

Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Tryba

Piszcz

Borowiak‐Palen

et al. 2012

Polish Journal of Chemical Technology

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TiO 2 of anatase structure was modifi ed by tungsten dioxide and H 2 O 2 in order to obtain WO 3 -TiO 2 photocatalyst with enhanced photocatalytic activity under both, UV and artifi cial solar light irradiations. WO 2 was dissolved in 30% H 2 O 2 and mixed with TiO 2 in a vacuum evaporator at 70 o C. Such modifi ed TiO 2 was dried and then calcinated at 400 and 600 o C. The prepared samples and unmodifi ed TiO 2 were used for the photocatalytic decomposition of humic acids (Leonardite standard IHSS) in the aqueous solution under irradiations of both, UV and artifi cial solar light. Modifi cation of TiO 2 with tungsten dioxide and H 2 O 2 improved separation of free carriers in TiO 2 which resulted in the increase of OH radicals formation. Calcination caused an increase of anatase crystals and higher yield in OH radicals. The uncalcined samples showed high abilities for the adsorption of HA. Combination of adsorption abilities and photocatalytic activity of photocatalyst caused that the uncalcined TiO 2 modifi ed with WO 2 /H 2 O 2 showed the shortest time of HA mineralisation. The mineralisation of HA under the artifi cial solar light was much lower than under the UV. It was proved that, although OH radicals are powerful in the decomposition of HA, adsorption can facilitate the contact of the adsorbed molecules with the photocatalyst surface and accelerate their photocatalytic decomposition.

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Section: Photocatalytic Decomposition Of Hasupporting

confidence: 79%

Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Tryba

Piszcz

Borowiak‐Palen

et al. 2012

Polish Journal of Chemical Technology

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“…This formula is a reaction kinetic equation. It is found that TiO 2 photocatalytic degradation reactions abide by the first-order reaction kinetic equation [21,22]. Based on the kinetic data in Figures 4(c) and 4(d), we can get the optimum load amount of TiO 2 nanoparticles on the TiO 2 /carbon fiber composites by comparing the degradation rate K value.…”

Section: International Journal Of Photoenergymentioning

confidence: 96%

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Tang

Abas

Wang

2018

International Journal of Photoenergy

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TiO 2 /carbon fiber composite is achieved by loading TiO 2 nanoparticles on biomass carbon fiber, which originates from the carbonized natural bast. The carbonized process and the loading amount of TiO 2 are researched in detail. It is found that the carbonized bast fiber shows robust adsorption characteristics for TiO 2 nanoparticles in aqueous dispersion, and TiO 2 nanoparticles with~15 wt.% in total weight are uniformly loaded onto the fiber surface. The photocatalytic properties of TiO 2 /carbon fiber composite are evaluated by photocatalytic degradation of rhodamine B and water splitting for hydrogen production. The results indicate that 90% RhB molecules could be attacked in 60 min under UV light irradiation, and the hydrogen production rate of water splitting is up to 338.51 μmol/h. The highlight is that TiO 2 /carbon fiber composite is easy to be recycled due to the incorporation of macroscopical biomass carbon fiber.

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“…[12,13] In addition, removal of organic pollutants from industrial and household wastewater is also an important environment issue and carbon-semiconductor composites have been explored for organic pollutants removal from wastewater. [14][15][16][17] For example, porous carbon-TiO 2 composite acts not only as a photocatalyst under visible light and showed good photodegradation activity for organic pollutants, but also as an adsorbent to extract the pollutants through the pores of the matrix. [14][15][16] Similarly, porous carbon-doped ZnO composite also exhibited a good photocatalytic performance in terms of the degradation of organic pollutants under visible light.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17] For example, porous carbon-TiO 2 composite acts not only as a photocatalyst under visible light and showed good photodegradation activity for organic pollutants, but also as an adsorbent to extract the pollutants through the pores of the matrix. [14][15][16] Similarly, porous carbon-doped ZnO composite also exhibited a good photocatalytic performance in terms of the degradation of organic pollutants under visible light. [17,18] However, the components in these porous carbon-metal oxide composites usually cannot achieve homogeneous dispersion since they were frequently prepared by mechanical or physical mixing the metal oxides with the porous carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Atomically homogeneous dispersed ZnO/N-doped nanoporous carbon composites with enhanced CO2 uptake capacities and high efficient organic pollutants removal from water

Chen

Kong

et al. 2015

Carbon

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Advanced functional composite of ZnO nanoparticles embedded in N-doped nanoporous carbons has been synthesized by a simple one-step carbonization of zeolitic imidazolate framework-8 under a water stream atmosphere. A variety of characterization techniques show that the introduction of water steam during the carbonization process holds the key to obtain the fine and homogeneously dispersed ZnO nanoparticles within the functionalised nanoporous carbon matrix. Possessing a higher specific surface area, a larger pore volume and abundant oxygen-containing hydrophilic functional groups, the resulting composite exhibits a stronger interaction with CO 2 and is more efficient to promote the photocatalytic degradation-adsorption of methylene blue under visible light than the composite obtained without steam treatment. As a result, the steam derived composite exhibits increased CO 2 uptake capacity and excellent methylene blue molecules removal from water. Using different metal-organic frameworks as precursors, this new, simple and green method can be further expanded to generate various new homogeneous dispersed functional metal oxide/porous carbon composites with high efficient in relevant applications.

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Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites

Cited by 180 publications

References 42 publications

Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Atomically homogeneous dispersed ZnO/N-doped nanoporous carbon composites with enhanced CO2 uptake capacities and high efficient organic pollutants removal from water

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Synergy between surface adsorption and photocatalysis during degradation of humic acid on TiO2/activated carbon composites

Cited by 180 publications

References 42 publications

Photocatalytic mineralisation of humic acids using TiO2 modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic mineralisation of humic acids using TiO2 modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic Degradation and Hydrogen Production of TiO2/Carbon Fiber Composite Using Bast as a Carbon Fiber Source

Atomically homogeneous dispersed ZnO/N-doped nanoporous carbon composites with enhanced CO2 uptake capacities and high efficient organic pollutants removal from water

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Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic mineralisation of humic acids using TiO₂ modified by tungsten dioxide/ hydrogen peroxide

Photocatalytic Degradation and Hydrogen Production of TiO₂/Carbon Fiber Composite Using Bast as a Carbon Fiber Source