The Experts below are selected from a list of 1860 Experts worldwide ranked by ideXlab platform

Xuefeng Bai - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic reduction of Potassium Chromate by Zn-doped TiO2/Ti film catalyst
    Applied Surface Science, 2010
    Co-Authors: Zhongping Yao, Fangzhou Jia, Yanli Jiang, Zhaohua Jiang, Xuefeng Bai
    Abstract:

    Abstract The aim of this work was to investigate the photocatalytic (PC) reduction of Potassium Chromate by Zn-doped TiO 2 /Ti film catalysts. The film catalyst was prepared by plasma electrolytic oxidation method in H 2 SO 4 solution with different dosages of ZnSO 4 . The composition and structure of the film catalysts was studied by XRD, SEM and EPMA. The removal rate of Potassium Chromate was investigated under the conditions of the different dosages of ZnSO 4 and the initial concentration of Chromate Potassium, and the reductive product during the PC reduction process was analyzed. The results showed that the film catalyst was composed of anatase TiO 2 and rutile TiO 2 with the porous structure. When the dosage of ZnSO 4 was 0.2 g/L, the film catalyst presented the highest catalytic activity, which related to the amount and the crystal grain size of anatase TiO 2 in the film. The PC reduction of Potassium Chromate by the film catalyst obeyed the pseudo-first-order kinetic equation. The UV–vis spectrum and XPS analyses proved that Chromate Cr(VI) was reduced to Cr(III), which existed in the form of insoluble Cr(OH) 3 .

  • photocatalytic reduction of Potassium Chromate by zn doped tio2 ti film catalyst
    Applied Surface Science, 2010
    Co-Authors: Zhongping Yao, Fangzhou Jia, Yanli Jiang, Zhaohua Jiang, Xuefeng Bai
    Abstract:

    Abstract The aim of this work was to investigate the photocatalytic (PC) reduction of Potassium Chromate by Zn-doped TiO 2 /Ti film catalysts. The film catalyst was prepared by plasma electrolytic oxidation method in H 2 SO 4 solution with different dosages of ZnSO 4 . The composition and structure of the film catalysts was studied by XRD, SEM and EPMA. The removal rate of Potassium Chromate was investigated under the conditions of the different dosages of ZnSO 4 and the initial concentration of Chromate Potassium, and the reductive product during the PC reduction process was analyzed. The results showed that the film catalyst was composed of anatase TiO 2 and rutile TiO 2 with the porous structure. When the dosage of ZnSO 4 was 0.2 g/L, the film catalyst presented the highest catalytic activity, which related to the amount and the crystal grain size of anatase TiO 2 in the film. The PC reduction of Potassium Chromate by the film catalyst obeyed the pseudo-first-order kinetic equation. The UV–vis spectrum and XPS analyses proved that Chromate Cr(VI) was reduced to Cr(III), which existed in the form of insoluble Cr(OH) 3 .

  • Calcination/acid-activation treatment of an anodic oxidation TiO2/Ti film catalyst
    Rare Metals, 2009
    Co-Authors: Zhongping Yao, Yanli Jiang, Zhaohua Jiang, Hongkui Zhu, Xuefeng Bai
    Abstract:

    The aim of this work was to investigate the effects of calcination/acid-activation on the composition, structure, and photocatalytic (PC) reduction property of an anodic oxidation TiO2/Ti film catalyst. The surface morphology and phase composition were examined by scanning electron microscopy and X-ray diffraction. The catalytic property of the film catalysts was evaluated through the removal rate of Potassium Chromate during the PC reduction process. The results showed that the film catalysts were composed of anatase and rutile TiO2 with a micro-porous surface structure. The calcination treatment increased the content of TiO2 in the film, changed the relative ratio of anatase and rutile TiO2, and decreased the size of the micro pores of the film catalysts. The removal rate of Potassium Chromate was related to the technique parameters of calcination/acid-activation treatment. When the anodic oxidation TiO2/Ti film catalyst was calcined at 873 K for 30 min and then acid-activated in the concentrated H2SO4 for 60 min, it presented the highest catalytic property, with the removal rate of Potassium Chromate of 96.3% during the PC reduction process under the experimental conditions.

Bao-zeng Ren - One of the best experts on this subject based on the ideXlab platform.

  • densities and viscosities of chromium trioxide Potassium Chromate Potassium diChromate water from 298 15 to 333 15 k
    Journal of Chemical & Engineering Data, 2008
    Co-Authors: Ji-yan Wang, Fu'an Wang, Peng Zhang, Bao-zeng Ren
    Abstract:

    Densities and viscosities of chromium trioxide + Potassium Chromate + Potassium diChromate + water quaternary mixtures and Potassium Chromate + Potassium diChromate + water ternary mixtures have been measured from (298.15 to 333.15) K. The dependence of density and viscosity on temperature and concentration has been correlated. Apparent molar volumes, standard partial molar volumes, and the viscosity B-coefficient of chromium trioxide were calculated from the experimental measurements. The solute-mixed solvent interaction, solute–solute interaction, and structure-making effect of chromium trioxide have been discussed using the Helper equation and the Jones−Dole equation. The relationship between relative changes in viscosity and solute-mixed solvent interaction has been probed.

  • Densities and Viscosities of Chromium Trioxide + Potassium Chromate + Potassium DiChromate + Water from (298.15 to 333.15) K
    Journal of Chemical & Engineering Data, 2008
    Co-Authors: Ji-yan Wang, Fu'an Wang, Peng Zhang, Bao-zeng Ren
    Abstract:

    Densities and viscosities of chromium trioxide + Potassium Chromate + Potassium diChromate + water quaternary mixtures and Potassium Chromate + Potassium diChromate + water ternary mixtures have been measured from (298.15 to 333.15) K. The dependence of density and viscosity on temperature and concentration has been correlated. Apparent molar volumes, standard partial molar volumes, and the viscosity B-coefficient of chromium trioxide were calculated from the experimental measurements. The solute-mixed solvent interaction, solute–solute interaction, and structure-making effect of chromium trioxide have been discussed using the Helper equation and the Jones−Dole equation. The relationship between relative changes in viscosity and solute-mixed solvent interaction has been probed.

Zhongping Yao - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic reduction of Potassium Chromate by Zn-doped TiO2/Ti film catalyst
    Applied Surface Science, 2010
    Co-Authors: Zhongping Yao, Fangzhou Jia, Yanli Jiang, Zhaohua Jiang, Xuefeng Bai
    Abstract:

    Abstract The aim of this work was to investigate the photocatalytic (PC) reduction of Potassium Chromate by Zn-doped TiO 2 /Ti film catalysts. The film catalyst was prepared by plasma electrolytic oxidation method in H 2 SO 4 solution with different dosages of ZnSO 4 . The composition and structure of the film catalysts was studied by XRD, SEM and EPMA. The removal rate of Potassium Chromate was investigated under the conditions of the different dosages of ZnSO 4 and the initial concentration of Chromate Potassium, and the reductive product during the PC reduction process was analyzed. The results showed that the film catalyst was composed of anatase TiO 2 and rutile TiO 2 with the porous structure. When the dosage of ZnSO 4 was 0.2 g/L, the film catalyst presented the highest catalytic activity, which related to the amount and the crystal grain size of anatase TiO 2 in the film. The PC reduction of Potassium Chromate by the film catalyst obeyed the pseudo-first-order kinetic equation. The UV–vis spectrum and XPS analyses proved that Chromate Cr(VI) was reduced to Cr(III), which existed in the form of insoluble Cr(OH) 3 .

  • photocatalytic reduction of Potassium Chromate by zn doped tio2 ti film catalyst
    Applied Surface Science, 2010
    Co-Authors: Zhongping Yao, Fangzhou Jia, Yanli Jiang, Zhaohua Jiang, Xuefeng Bai
    Abstract:

    Abstract The aim of this work was to investigate the photocatalytic (PC) reduction of Potassium Chromate by Zn-doped TiO 2 /Ti film catalysts. The film catalyst was prepared by plasma electrolytic oxidation method in H 2 SO 4 solution with different dosages of ZnSO 4 . The composition and structure of the film catalysts was studied by XRD, SEM and EPMA. The removal rate of Potassium Chromate was investigated under the conditions of the different dosages of ZnSO 4 and the initial concentration of Chromate Potassium, and the reductive product during the PC reduction process was analyzed. The results showed that the film catalyst was composed of anatase TiO 2 and rutile TiO 2 with the porous structure. When the dosage of ZnSO 4 was 0.2 g/L, the film catalyst presented the highest catalytic activity, which related to the amount and the crystal grain size of anatase TiO 2 in the film. The PC reduction of Potassium Chromate by the film catalyst obeyed the pseudo-first-order kinetic equation. The UV–vis spectrum and XPS analyses proved that Chromate Cr(VI) was reduced to Cr(III), which existed in the form of insoluble Cr(OH) 3 .

  • Calcination/acid-activation treatment of an anodic oxidation TiO2/Ti film catalyst
    Rare Metals, 2009
    Co-Authors: Zhongping Yao, Yanli Jiang, Zhaohua Jiang, Hongkui Zhu, Xuefeng Bai
    Abstract:

    The aim of this work was to investigate the effects of calcination/acid-activation on the composition, structure, and photocatalytic (PC) reduction property of an anodic oxidation TiO2/Ti film catalyst. The surface morphology and phase composition were examined by scanning electron microscopy and X-ray diffraction. The catalytic property of the film catalysts was evaluated through the removal rate of Potassium Chromate during the PC reduction process. The results showed that the film catalysts were composed of anatase and rutile TiO2 with a micro-porous surface structure. The calcination treatment increased the content of TiO2 in the film, changed the relative ratio of anatase and rutile TiO2, and decreased the size of the micro pores of the film catalysts. The removal rate of Potassium Chromate was related to the technique parameters of calcination/acid-activation treatment. When the anodic oxidation TiO2/Ti film catalyst was calcined at 873 K for 30 min and then acid-activated in the concentrated H2SO4 for 60 min, it presented the highest catalytic property, with the removal rate of Potassium Chromate of 96.3% during the PC reduction process under the experimental conditions.

Ji-yan Wang - One of the best experts on this subject based on the ideXlab platform.

  • densities and viscosities of chromium trioxide Potassium Chromate Potassium diChromate water from 298 15 to 333 15 k
    Journal of Chemical & Engineering Data, 2008
    Co-Authors: Ji-yan Wang, Fu'an Wang, Peng Zhang, Bao-zeng Ren
    Abstract:

    Densities and viscosities of chromium trioxide + Potassium Chromate + Potassium diChromate + water quaternary mixtures and Potassium Chromate + Potassium diChromate + water ternary mixtures have been measured from (298.15 to 333.15) K. The dependence of density and viscosity on temperature and concentration has been correlated. Apparent molar volumes, standard partial molar volumes, and the viscosity B-coefficient of chromium trioxide were calculated from the experimental measurements. The solute-mixed solvent interaction, solute–solute interaction, and structure-making effect of chromium trioxide have been discussed using the Helper equation and the Jones−Dole equation. The relationship between relative changes in viscosity and solute-mixed solvent interaction has been probed.

  • Densities and Viscosities of Chromium Trioxide + Potassium Chromate + Potassium DiChromate + Water from (298.15 to 333.15) K
    Journal of Chemical & Engineering Data, 2008
    Co-Authors: Ji-yan Wang, Fu'an Wang, Peng Zhang, Bao-zeng Ren
    Abstract:

    Densities and viscosities of chromium trioxide + Potassium Chromate + Potassium diChromate + water quaternary mixtures and Potassium Chromate + Potassium diChromate + water ternary mixtures have been measured from (298.15 to 333.15) K. The dependence of density and viscosity on temperature and concentration has been correlated. Apparent molar volumes, standard partial molar volumes, and the viscosity B-coefficient of chromium trioxide were calculated from the experimental measurements. The solute-mixed solvent interaction, solute–solute interaction, and structure-making effect of chromium trioxide have been discussed using the Helper equation and the Jones−Dole equation. The relationship between relative changes in viscosity and solute-mixed solvent interaction has been probed.

Anju Chopra - One of the best experts on this subject based on the ideXlab platform.

  • Effect of heavy metal, copper sulphate and Potassium Chromate on behaviour of “Tailless water flea†Simocephalus vetulus (Crustacea - Cladocera)
    Journal of Applied and Natural Science, 2018
    Co-Authors: Anand Mishra, Sanjive Shukla, Anju Chopra
    Abstract:

    Water fleas constitute major zooplankton population of fresh water aquatic ecosystem. Their population density is an indicative of well-being of aquatic bodies. Simocephalus vetulus (Crustacea - Cladocera) is a tailless water flea and is well suited lab model for environmental monitoring. Copper a Gray listed heavy metals despite being an essential micronutrient, becomes highly toxic when present in excess quantity in aquatic ecosystem thereby causing deleterious effects on aquatic flora as well as fauna. The water-flea exposed to acute 0.37 mg/l (96hr LC50), sub-acute 0.0925 mg/l (25% of 96hr LC50) value and chronic 0.037 mg/l (10% of 96hr LC50) value of copper sulphate and acute 0.16 mg/l (96 hr LC50), sub-acute 0.04 mg/l (25% of 96 hr LC50) value and chronic 0.016 mg/l (10% of 96 hr LC50) value of Potassium Chromate showed behavioural alterations like initial hyperactivity, fast appendage movements and in phototaxis, geotaxis and avoidance indices. At later stage erratic swimming and spinning, reduced activity, loss of balance, reduced feeding and darkening of cuticular coloration, reduced phototactic, geotaxis and avoidance indices were the major effects on its behaviour. The behavioural alterations of S. vetulus showed the most susceptible and foremost indication of potential toxic effects. Various behavioural parameters, used in present study may serve as better biomarkers about metal toxicity and monitoring of drinking water quality

  • effect of heavy metal copper sulphate and Potassium Chromate on behaviour of â œtailless water fleaâ simocephalus vetulus crustacea cladocera
    Journal of Applied and Natural Science, 2018
    Co-Authors: Anand Mishra, Sanjive Shukla, Anju Chopra
    Abstract:

    Water fleas constitute major zooplankton population of fresh water aquatic ecosystem. Their population density is an indicative of well-being of aquatic bodies. Simocephalus vetulus (Crustacea - Cladocera) is a tailless water flea and is well suited lab model for environmental monitoring. Copper a Gray listed heavy metals despite being an essential micronutrient, becomes highly toxic when present in excess quantity in aquatic ecosystem thereby causing deleterious effects on aquatic flora as well as fauna. The water-flea exposed to acute 0.37 mg/l (96hr LC50), sub-acute 0.0925 mg/l (25% of 96hr LC50) value and chronic 0.037 mg/l (10% of 96hr LC50) value of copper sulphate and acute 0.16 mg/l (96 hr LC50), sub-acute 0.04 mg/l (25% of 96 hr LC50) value and chronic 0.016 mg/l (10% of 96 hr LC50) value of Potassium Chromate showed behavioural alterations like initial hyperactivity, fast appendage movements and in phototaxis, geotaxis and avoidance indices. At later stage erratic swimming and spinning, reduced activity, loss of balance, reduced feeding and darkening of cuticular coloration, reduced phototactic, geotaxis and avoidance indices were the major effects on its behaviour. The behavioural alterations of S. vetulus showed the most susceptible and foremost indication of potential toxic effects. Various behavioural parameters, used in present study may serve as better biomarkers about metal toxicity and monitoring of drinking water quality