Optimisation of an annular photoreactor process for degradation of Congo Red using a newly synthesized titania impregnated kaolinite nano-photocatalyst

Chong, Meng Nan; Lei, Shaomin; Jin, Bo; Saint, Christopher P.; Chow, Christopher W.K.

doi:10.1016/j.seppur.2009.04.001

Cited by 128 publications

(49 citation statements)

References 34 publications

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“…Moreover, it probably resulted from the complexity of the chemical structure and lower solubility in water of the HA compound undergoing mineralization to CO 2 and water together with byproduct formation. These results were consistent with several previous studies that have reported the dependency of the TiO 2 reaction rate on the concentration of contaminants in water [27]. A high concentration of pollutants in water saturates the catalyst surface and hence reduces the photonic efficiency and deactivation of the photocatalyst.…”

Section: Effect Of Initial Ha Concentrationsupporting

confidence: 93%

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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Humic substances are among the most important natural organic matters (NOM) existing in ground and surface waters and are known as one of the main disinfection by-product (DBPs) precursors that may act as health risk factors [1]. Humic substances -mainly humic acids (HA), which constitute the major fraction of NOM in water supplies -have been suggested as a standard for mimicking NOM in the laboratory. HA are non-biodegradable and have color, odor, and also exhibit a wide range of distribution in molecular weight and Pol. J. Environ. Stud. Vol. 27, No. 6 (2018), 2765-2774 AbstractA photocatalyst comprised of strontium-doped TiO 2 coated on porous ceramic filter media (Sr-TiO 2 /PCFM) was prepared using the heat-treated process. The main objective of this study was to investigate the effects of catalyst dosage, initial HA concentrations, pH, and temperature on the adsorption and degradation of humic acid (HA) in a solution containing Sr-TiO 2 /PCFM under irradiation of UV light. Removal efficiency of 84.25% for HA was achieved under experimental conditions for a Sr-TiO 2 /PCFM dosage of 80 g at an initial concentration of 15 mg/L over a period of 8 h. Higher degradation was found for HA in the acidic environment and at higher operating temperatures. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and Langmuir isotherm models. The oxidation rate constants of HA were evaluated by using pseudo first-order kinetics that can describe the photodegradation process. Furthermore, the photocatalytic stability of Sr-TiO 2 /PCFM was performed with 3 cycles reused. These findings suggest that the Sr-TiO 2 /PCFM was found to be an effective and promising approach to eliminating HA in water resources.

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Section: Effect Of Initial Ha Concentrationsupporting

confidence: 93%

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Tung¹,

Xu²,

Zhang³

et al. 2018

Pol. J. Environ. Stud.

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“…Furthermore, in a mesoporous architecture, as observed in B15, the channels can act as a light-transfer path for bringing incident photons onto the inner surface of the photocatalyst and enhance the activity [59]. Also, the degradation efficiency of a porous photocatalyst might be enhanced by the adsorption ability by increasing the probability of surface reaction with the dye molecules [60]. Morphology of the nanomaterials have a great effect on their properties and applications [61].…”

Section: Photodegradation Mechanismmentioning

confidence: 99%

Mechanochemically prepared BiOCl nanoplates for removal of rhodamine B and pentachlorophenol

et al. 2015

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BiOCl was synthesized using bismuth nitrate pentahydrate and sodium chloride via ball milling for 15 (B15), 30 (B30), and 60 (B60) min. Scanning electron microscopy studies revealed the isolated nanoplate morphology for B15, an aggregated structure composed of nanoplates for B30, and a special three-dimensional morphology for B60. The X-ray diffraction patterns showed the purity and crystallinity of the products improved by increasing the milling time. Fourier transform infrared spectroscopy, photoluminescence spectroscopy, and nitrogen adsorption-desorption analysis using the BrunauerEmmett-Teller technique were also used to study the products. Diffuse reflectance spectroscopy studies revealed the band gap value of 3.27 eV for B30, B60 and a narrow band gap of 2.77 eV for B15. Photocatalytic studies toward rhodamine B degradation confirmed that the narrow band gap B15 was a stable and recyclable photocatalyst with the highest activity among the products. The effects of factors such as oxygen vacancies, surface defects, morphology, and band gap of products on the photocatalytic activities were studied. Comparison of rhodamine B and pentachlorophenol photodegradation processes revealed that both direct and indirect (dye-photosensitized) photocatalytic pathways could influence the removal results. Graphical abstract

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“…Additionally, in higher concentrations of Á OH radicals, RhB photodegradation surpasses the de-ethylation reaction [72]. Furthermore, other factors such as chemical composition, electronic (and orbital) structure, presence of oxygen vacancies and surface defects, indirect band gap nature, morphology, surface characteristics, mesoporous structure and adsorption ability of the semiconductor enhance the photocatalytic efficiency [51,[69][70][71][72][73][74][75][76][77][78]. …”

Section: Photodegradation Mechanismmentioning

confidence: 99%

Solid state preparation and photocatalytic activity of bismuth oxybromide nanoplates

et al. 2015

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A mechanochemical method was applied to prepare bismuth oxybromide (BiOBr) nanoplates using bismuth nitrate pentahydrate and potassium bromide for 15 (A15), 30 (A30) and 60 (A60) minutes. Scanning electron microscopy studies showed that all the products were comprised of nanoplates. Aggregated nanoplates along with microblocks were observed for A15 and A30 and the entire morphology was not homogenous. The morphology of A60 was uniform and consisted of thin and isolated nanoplates. Evaluation of the X-ray diffraction patterns showed that the purity and crystallinity of the products improved by increasing the milling time. The energy dispersive X-ray analysis confirmed the high purity of the products. Fourier transform infrared spectroscopy, photoluminescence spectroscopy and nitrogen adsorption-desorption analysis using the Brunauer-Emmett-Teller technique were also used to study the products. Diffuse reflectance spectroscopy studies clarified that all the samples were indirect band gap semiconductors with the band gap of 3.25 eV for A15 and the narrow band gap of 2.74 eV for A30 and A60. Photocatalytic studies revealed that A30 has the highest photocatalytic activity among the products. The effect of oxygen vacancies, surface defects, morphology and band gap of products on the photocatalytic or photosensitized degradation of rhodamine B (RhB) and pentachlorophenol (PCP) aqueous solutions were studied.

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Optimisation of an annular photoreactor process for degradation of Congo Red using a newly synthesized titania impregnated kaolinite nano-photocatalyst

Cited by 128 publications

References 34 publications

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Effective Removal of Humic Acid Using Strontium-Doped TiO2 Coated on Porous Ceramic Filter Media in Water Resource

Mechanochemically prepared BiOCl nanoplates for removal of rhodamine B and pentachlorophenol

Solid state preparation and photocatalytic activity of bismuth oxybromide nanoplates

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