4 Nitroaniline

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Rusheng Yuan - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic insight into the photocatalytic hydrogenation of 4-Nitroaniline over band-gap-tunable CdS photocatalysts
    Physical chemistry chemical physics : PCCP, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    CdS photocatalysts with tunable band gaps (2.17–2.32 eV) were successfully prepared by a solvothermal method. Photocatalytic hydrogenation of 4-Nitroaniline over the obtained samples was evaluated in the presence of HCO2NH4 as a hole scavenger upon purging with N2 under visible light irradiation (λ ≥ 420 nm). The CdS sample prepared by CdCl2 and sulfur powder in ethylenediamine showed excellent catalytic activity, giving 100% of 4-Nitroaniline conversion and 95% of p-phenylenediamine selectivity after 35 min of visible light irradiation. The results of electron spin resonance revealed that its photoexcited holes could efficiently react with HCO2− ions within HCO2NH4 molecules to produce ˙CO2− radicals with strong reductive abilities. Furthermore, photoexcited electrons of the obtained sample exhibited relatively strong reductive abilities as compared to other CdS samples. Therefore, this sample showed the highest catalytic activity among the CdS samples for the photocatalytic hydrogenation of 4-Nitroaniline.

  • Visible-light-induced photocatalytic hydrogenation of 4-Nitroaniline over In2S3 photocatalyst in water
    Catalysis Communications, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photocatalytic hydrogenation of 4-Nitroaniline over the In2S3 photocatalyst was investigated in water under visible light irradiation (λ ≥ 420 nm). After 90 min of visible light irradiation, 100% of 4-Nitroaniline could be reduced to p-phenylenediamine over the In2S3 photocatalyst in the presence of triethanolamine as a hole scavenger. Moreover, the photoreduction activity of the In2S3 photocatalyst could keep at ~ 100% in the 5th cycle of testing. On the basic of the results of electron spin resonance, photoinduced electrons of the In2S3 photocatalyst were identified as the active species for the photocatalytic hydrogenation of 4-Nitroaniline.

  • A new insight into the photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine in the presence of alcohols
    Applied Catalysis B-environmental, 2012
    Co-Authors: Linrui Wen, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photoreduction of 4-Nitroaniline to p-phenylenediamine over TiO2, ZnO, PbBi2Nb2O9 and CdS photocatalysts in the presence of CH3OH was investigated under light irradiation (hv ≥ band gap) upon purging with N2. Compared with PbBi2Nb2O9 and CdS, TiO2 and ZnO showed photocatalytic activities for the photoreduction of 4-Nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH3OH molecule. The species had strong reductive ability, and therefore could reduce 4-Nitroaniline to p-phenylenediamine. Other alcohols (C2H5OH and i-C3H7OH) were also found to be efficient additives for the photoreduction of 4-Nitroaniline. The results of the 2H-labeled experiments indicated that the p-phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-Nitroaniline and H2O molecules. A mechanism was proposed to explain the photoreduction of 4-Nitroaniline to p-phenylenediamine in the present alcohols.

  • a simple and highly efficient route for the preparation of p phenylenediamine by reducing 4 Nitroaniline over commercial cds visible light driven photocatalyst in water
    Green Chemistry, 2012
    Co-Authors: Guodong Liu, Shijing Liang, Huarong Zheng, Quanhua Xie, Rusheng Yuan
    Abstract:

    Highly efficient photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over a commercial CdS photocatalyst was observed under visible light irradiation (λ ≥ 420 nm) in water. The conversion of 4-Nitroaniline and the selectivity of p-phenylenediamine were ∼100% and ∼98% after 9 min of visible light irradiation, respectively. The photoreduction efficiency of 4-Nitroaniline over the CdS photocatalyst remained above 95% in the 5th cycle of testing. Its photocatalytic activity was much higher than those of nitrogen-doped TiO2 and commercial TiO2 photocatalysts. Further experimental results revealed that the ammonium formate and N2 atmosphere were indispensable for the photocatalytic reduction of 4-Nitroaniline over the CdS photocatalyst. On the basis of the results of electron spin resonance, photoexcited electrons and ·CO2− radicals were detected in the present system. These species had strong reductive powers, and were therefore able to efficiently reduce 4-Nitroaniline to p-phenylenediamine.

  • Efficient visible-light-induced photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over nanocrystalline PbBi2Nb2O9
    Journal of Catalysis, 2012
    Co-Authors: Guodong Liu, Shijing Liang, Yan Chen, Lijuan Shen, Huarong Zheng, Rusheng Yuan, Yidong Hou
    Abstract:

    Abstract Nanocrystalline PbBi 2 Nb 2 O 9 was successfully prepared by a modified sol – gel method. The as-prepared nanocrystalline PbBi 2 Nb 2 O 9 was an active visible-light-driven photocatalyst for the photoreduction of 4-Nitroaniline to p -phenylenediamine in aqueous solution upon purging with N 2 . Its photocatalytic activity was determined by the balance between the surface area and crystallinity. The best sample was obtained after calcination at 650 °C, giving 4-Nitroaniline conversion of ∼100% and p -phenylenediamine selectivity of ∼99% after irradiation for 150 min, which was much higher than those of bulk PbBi 2 Nb 2 O 9 and TiO 2− x N x photocatalysts. Further experiments revealed that oxalate anion (as a hole scavenger) was indispensable for the photocatalytic reduction of 4-Nitroaniline. Moreover, on the basis of the electron spin resonance analysis result, a mechanism was proposed to explain the photoreduction of 4-Nitroaniline over nanocrystalline PbBi 2 Nb 2 O 9 .

Lijuan Shen - One of the best experts on this subject based on the ideXlab platform.

  • an architecture of cds h2ti5o11 ultrathin nanobelt for photocatalytic hydrogenation of 4 Nitroaniline with highly efficient performance
    Journal of Materials Chemistry, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • An architecture of CdS/H2Ti5O11 ultrathin nanobelt for photocatalytic hydrogenation of 4-Nitroaniline with highly efficient performance
    Journal of Materials Chemistry A, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • Mechanistic insight into the photocatalytic hydrogenation of 4-Nitroaniline over band-gap-tunable CdS photocatalysts
    Physical chemistry chemical physics : PCCP, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    CdS photocatalysts with tunable band gaps (2.17–2.32 eV) were successfully prepared by a solvothermal method. Photocatalytic hydrogenation of 4-Nitroaniline over the obtained samples was evaluated in the presence of HCO2NH4 as a hole scavenger upon purging with N2 under visible light irradiation (λ ≥ 420 nm). The CdS sample prepared by CdCl2 and sulfur powder in ethylenediamine showed excellent catalytic activity, giving 100% of 4-Nitroaniline conversion and 95% of p-phenylenediamine selectivity after 35 min of visible light irradiation. The results of electron spin resonance revealed that its photoexcited holes could efficiently react with HCO2− ions within HCO2NH4 molecules to produce ˙CO2− radicals with strong reductive abilities. Furthermore, photoexcited electrons of the obtained sample exhibited relatively strong reductive abilities as compared to other CdS samples. Therefore, this sample showed the highest catalytic activity among the CdS samples for the photocatalytic hydrogenation of 4-Nitroaniline.

  • Visible-light-induced photocatalytic hydrogenation of 4-Nitroaniline over In2S3 photocatalyst in water
    Catalysis Communications, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photocatalytic hydrogenation of 4-Nitroaniline over the In2S3 photocatalyst was investigated in water under visible light irradiation (λ ≥ 420 nm). After 90 min of visible light irradiation, 100% of 4-Nitroaniline could be reduced to p-phenylenediamine over the In2S3 photocatalyst in the presence of triethanolamine as a hole scavenger. Moreover, the photoreduction activity of the In2S3 photocatalyst could keep at ~ 100% in the 5th cycle of testing. On the basic of the results of electron spin resonance, photoinduced electrons of the In2S3 photocatalyst were identified as the active species for the photocatalytic hydrogenation of 4-Nitroaniline.

  • A new insight into the photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine in the presence of alcohols
    Applied Catalysis B-environmental, 2012
    Co-Authors: Linrui Wen, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photoreduction of 4-Nitroaniline to p-phenylenediamine over TiO2, ZnO, PbBi2Nb2O9 and CdS photocatalysts in the presence of CH3OH was investigated under light irradiation (hv ≥ band gap) upon purging with N2. Compared with PbBi2Nb2O9 and CdS, TiO2 and ZnO showed photocatalytic activities for the photoreduction of 4-Nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH3OH molecule. The species had strong reductive ability, and therefore could reduce 4-Nitroaniline to p-phenylenediamine. Other alcohols (C2H5OH and i-C3H7OH) were also found to be efficient additives for the photoreduction of 4-Nitroaniline. The results of the 2H-labeled experiments indicated that the p-phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-Nitroaniline and H2O molecules. A mechanism was proposed to explain the photoreduction of 4-Nitroaniline to p-phenylenediamine in the present alcohols.

Ruowen Liang - One of the best experts on this subject based on the ideXlab platform.

  • an architecture of cds h2ti5o11 ultrathin nanobelt for photocatalytic hydrogenation of 4 Nitroaniline with highly efficient performance
    Journal of Materials Chemistry, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • An architecture of CdS/H2Ti5O11 ultrathin nanobelt for photocatalytic hydrogenation of 4-Nitroaniline with highly efficient performance
    Journal of Materials Chemistry A, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • Mechanistic insight into the photocatalytic hydrogenation of 4-Nitroaniline over band-gap-tunable CdS photocatalysts
    Physical chemistry chemical physics : PCCP, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    CdS photocatalysts with tunable band gaps (2.17–2.32 eV) were successfully prepared by a solvothermal method. Photocatalytic hydrogenation of 4-Nitroaniline over the obtained samples was evaluated in the presence of HCO2NH4 as a hole scavenger upon purging with N2 under visible light irradiation (λ ≥ 420 nm). The CdS sample prepared by CdCl2 and sulfur powder in ethylenediamine showed excellent catalytic activity, giving 100% of 4-Nitroaniline conversion and 95% of p-phenylenediamine selectivity after 35 min of visible light irradiation. The results of electron spin resonance revealed that its photoexcited holes could efficiently react with HCO2− ions within HCO2NH4 molecules to produce ˙CO2− radicals with strong reductive abilities. Furthermore, photoexcited electrons of the obtained sample exhibited relatively strong reductive abilities as compared to other CdS samples. Therefore, this sample showed the highest catalytic activity among the CdS samples for the photocatalytic hydrogenation of 4-Nitroaniline.

  • Visible-light-induced photocatalytic hydrogenation of 4-Nitroaniline over In2S3 photocatalyst in water
    Catalysis Communications, 2013
    Co-Authors: Rui Lin, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photocatalytic hydrogenation of 4-Nitroaniline over the In2S3 photocatalyst was investigated in water under visible light irradiation (λ ≥ 420 nm). After 90 min of visible light irradiation, 100% of 4-Nitroaniline could be reduced to p-phenylenediamine over the In2S3 photocatalyst in the presence of triethanolamine as a hole scavenger. Moreover, the photoreduction activity of the In2S3 photocatalyst could keep at ~ 100% in the 5th cycle of testing. On the basic of the results of electron spin resonance, photoinduced electrons of the In2S3 photocatalyst were identified as the active species for the photocatalytic hydrogenation of 4-Nitroaniline.

  • A new insight into the photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine in the presence of alcohols
    Applied Catalysis B-environmental, 2012
    Co-Authors: Linrui Wen, Lijuan Shen, Ruowen Liang, Rusheng Yuan
    Abstract:

    Abstract Photoreduction of 4-Nitroaniline to p-phenylenediamine over TiO2, ZnO, PbBi2Nb2O9 and CdS photocatalysts in the presence of CH3OH was investigated under light irradiation (hv ≥ band gap) upon purging with N2. Compared with PbBi2Nb2O9 and CdS, TiO2 and ZnO showed photocatalytic activities for the photoreduction of 4-Nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH3OH molecule. The species had strong reductive ability, and therefore could reduce 4-Nitroaniline to p-phenylenediamine. Other alcohols (C2H5OH and i-C3H7OH) were also found to be efficient additives for the photoreduction of 4-Nitroaniline. The results of the 2H-labeled experiments indicated that the p-phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-Nitroaniline and H2O molecules. A mechanism was proposed to explain the photoreduction of 4-Nitroaniline to p-phenylenediamine in the present alcohols.

Shijing Liang - One of the best experts on this subject based on the ideXlab platform.

  • an architecture of cds h2ti5o11 ultrathin nanobelt for photocatalytic hydrogenation of 4 Nitroaniline with highly efficient performance
    Journal of Materials Chemistry, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • An architecture of CdS/H2Ti5O11 ultrathin nanobelt for photocatalytic hydrogenation of 4-Nitroaniline with highly efficient performance
    Journal of Materials Chemistry A, 2015
    Co-Authors: Jinhua Xiong, Shijing Liang, Lijuan Shen, Yuhao Liu, Changsheng Cao, Ruowen Liang
    Abstract:

    A CdS/H2Ti5O11 ultrathin nanobelt nanocomposite (CdTi) was fabricated successfully by a two-step process. It was confirmed by SEM and TEM/HRTEM that the highly dispersed CdS about 15 nm in size was firmly anchored on the ultrathin nanobelt. The as-prepared CdTi-5 with an optimal loading of 81.3% CdS converted 4-Nitroaniline to p-phenylenediamine, giving almost 100% yield with a selectivity of about 98% in 3 min under visible light irradiation. Its photocatalytic activity was much higher than that of the bare CdS and P25/CdS composition. The highly efficient performance was attributed to the synergetic effects of the formed heterojunction between titanate, nanobelt and CdS as well as the unique features of the titanate nanobelt, which makes the photo-generated electron to transfer smoothly and promotes the separation of photo-induced carriers. Finally, based on the experimental results of Mott–Schottky, UV-vis DRS and EPR, a possible reaction mechanism for the hydrogenation of 4-Nitroaniline over the CdTi was proposed.

  • a simple and highly efficient route for the preparation of p phenylenediamine by reducing 4 Nitroaniline over commercial cds visible light driven photocatalyst in water
    Green Chemistry, 2012
    Co-Authors: Guodong Liu, Shijing Liang, Huarong Zheng, Quanhua Xie, Rusheng Yuan
    Abstract:

    Highly efficient photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over a commercial CdS photocatalyst was observed under visible light irradiation (λ ≥ 420 nm) in water. The conversion of 4-Nitroaniline and the selectivity of p-phenylenediamine were ∼100% and ∼98% after 9 min of visible light irradiation, respectively. The photoreduction efficiency of 4-Nitroaniline over the CdS photocatalyst remained above 95% in the 5th cycle of testing. Its photocatalytic activity was much higher than those of nitrogen-doped TiO2 and commercial TiO2 photocatalysts. Further experimental results revealed that the ammonium formate and N2 atmosphere were indispensable for the photocatalytic reduction of 4-Nitroaniline over the CdS photocatalyst. On the basis of the results of electron spin resonance, photoexcited electrons and ·CO2− radicals were detected in the present system. These species had strong reductive powers, and were therefore able to efficiently reduce 4-Nitroaniline to p-phenylenediamine.

  • High efficient photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over microcrystalline SrBi2Nb2O9
    Catalysis Communications, 2012
    Co-Authors: Shijing Liang, Yan Chen, Lijuan Shen, Huarong Zheng
    Abstract:

    Abstract High efficient photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over microcrystalline SrBi2Nb2O9 was observed upon purging with N2 under UV-light irradiation. Its photocatalytic activity was higher than that of sample P25 (commercial TiO2, Degussa Co.). The analysis results of X-ray diffraction and X-ray photoelectron spectroscopy revealed that microcrystalline SrBi2Nb2O9 had high stability for the photocatalytic reduction of 4-Nitroaniline. Further experiments indicated that ammonium oxalate was indispensable for the photocatalytic reduction of 4-Nitroaniline. Moreover, the high efficient photocatalytic reduction of 4-Nitroaniline over microcrystalline SrBi2Nb2O9 might be ascribed to its relatively high conduction band.

  • Efficient visible-light-induced photocatalytic reduction of 4-Nitroaniline to p-phenylenediamine over nanocrystalline PbBi2Nb2O9
    Journal of Catalysis, 2012
    Co-Authors: Guodong Liu, Shijing Liang, Yan Chen, Lijuan Shen, Huarong Zheng, Rusheng Yuan, Yidong Hou
    Abstract:

    Abstract Nanocrystalline PbBi 2 Nb 2 O 9 was successfully prepared by a modified sol – gel method. The as-prepared nanocrystalline PbBi 2 Nb 2 O 9 was an active visible-light-driven photocatalyst for the photoreduction of 4-Nitroaniline to p -phenylenediamine in aqueous solution upon purging with N 2 . Its photocatalytic activity was determined by the balance between the surface area and crystallinity. The best sample was obtained after calcination at 650 °C, giving 4-Nitroaniline conversion of ∼100% and p -phenylenediamine selectivity of ∼99% after irradiation for 150 min, which was much higher than those of bulk PbBi 2 Nb 2 O 9 and TiO 2− x N x photocatalysts. Further experiments revealed that oxalate anion (as a hole scavenger) was indispensable for the photocatalytic reduction of 4-Nitroaniline. Moreover, on the basis of the electron spin resonance analysis result, a mechanism was proposed to explain the photoreduction of 4-Nitroaniline over nanocrystalline PbBi 2 Nb 2 O 9 .

Okitsugu Kajimoto - One of the best experts on this subject based on the ideXlab platform.

  • uv absorption solvatochromic shift of 4 Nitroaniline in supercritical water
    Physical Chemistry Chemical Physics, 2003
    Co-Authors: H. Oka, Okitsugu Kajimoto
    Abstract:

    The solvation structure in supercritical (SC) water was studied by measuring UV spectral shifts of 4-Nitroaniline (1) at 380, 390 and 410 °C. The red shift was observed with increasing water density. The spectral shifts were plotted against the polarity parameter, (e − 1)/(2e + 1) (e: the dielectric constant of the solvent). The data at 410 °C show an excellent straight line whereas the data at 380 and 390 °C deviate from the line, which implies the occurrence of solvent clustering around the solute 1 near the critical temperature (Tc = 374 °C). The temperature range where significant clustering occurs in SC water is quite limited (Tr < 1.05) in contrast to the temperature dependence of the solvation in SC CF3H and SC CO2. This fact implies that the critical inhomogeneity of pure fluid significantly contributes to the clustering in the case of SC water.

  • UV absorption solvatochromic shift of 4-Nitroaniline in supercritical water
    Physical Chemistry Chemical Physics, 2003
    Co-Authors: H. Oka, Okitsugu Kajimoto
    Abstract:

    The solvation structure in supercritical (SC) water was studied by measuring UV spectral shifts of 4-Nitroaniline (1) at 380, 390 and 410 °C. The red shift was observed with increasing water density. The spectral shifts were plotted against the polarity parameter, (e − 1)/(2e + 1) (e: the dielectric constant of the solvent). The data at 410 °C show an excellent straight line whereas the data at 380 and 390 °C deviate from the line, which implies the occurrence of solvent clustering around the solute 1 near the critical temperature (Tc = 374 °C). The temperature range where significant clustering occurs in SC water is quite limited (Tr