In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen ...In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen sources. Under identical synthetic conditions, Bi OBr was more readily constructed into regular flower-like hierarchical architectures. The photocatalytic properties of the materials were studied by monitoring the degradation of rhodamine B（Rh B）,with visible light absorption, and colorless salicylic acid（SA）. It was found that both Rh B and SA were rapidly degraded on the surface of Bi OBr. Bi OCl was rather active for the degradation of Rh B,but ineffective toward the degradation of SA. However, neither Rh B nor SA could be degraded effectively in the case of Bi OI. Further experiments such as UV–visible spectroscopy and detection of U OH and O2 Uradicals suggest that the electronic structure of the Bi OX photocatalysts is responsible for the difference in their activities.展开更多
Rice husk ash(RHA),obtained by pyrolysis of rice husks,can be used as a potential reinforcing filler for rubber composites.In this work,ball milling in ethanol(ethanol-assisted milling)was used to hydroxylate the surf...Rice husk ash(RHA),obtained by pyrolysis of rice husks,can be used as a potential reinforcing filler for rubber composites.In this work,ball milling in ethanol(ethanol-assisted milling)was used to hydroxylate the surface of RHA,promoting the graft modification of bis-(γ-triethoxysilylpropyl)-tetrasulfide(Si69).The obtained modified RHA(RHA-EM-Si69)was filled into the natural rubber/butadiene rubber(NR/BR)composites,and the filler-rubber interactions were enhanced.In consequence,RHA-EM-Si69 filled NR/BR composites showed overall improvement in the mechanical properties compared with RHA filled NR/BR composites.The tear strength increased from 13.37 kN/m to 34.71 kN/m,and the tensile strength increased from 1.84 MPa to 7.75 MPa.Carbon black(N774)was also used for comparison under the same conditions.This method provides a potential for promoting the value of RHA in rubber industry.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21377067, 21177072, 21207079)Natural Science Foundation for Innovation Group of Hubei Province, China (No. 2009CDA020)open fund (KF2011-07) from the State Key Laboratory of Environmental Chemistry and Ecotoxicology, RCEES, CAS
文摘In this study, bismuth oxyhalide（Bi OXs（X_Cl, Br, I）） semiconductors were prepared by a simple solvothermal method, with ethanol serving as solvent and a series of tetrabutylammonium halide surfactants as halogen sources. Under identical synthetic conditions, Bi OBr was more readily constructed into regular flower-like hierarchical architectures. The photocatalytic properties of the materials were studied by monitoring the degradation of rhodamine B（Rh B）,with visible light absorption, and colorless salicylic acid（SA）. It was found that both Rh B and SA were rapidly degraded on the surface of Bi OBr. Bi OCl was rather active for the degradation of Rh B,but ineffective toward the degradation of SA. However, neither Rh B nor SA could be degraded effectively in the case of Bi OI. Further experiments such as UV–visible spectroscopy and detection of U OH and O2 Uradicals suggest that the electronic structure of the Bi OX photocatalysts is responsible for the difference in their activities.
基金This work was supported by the National Natural Science Foundation of China(No.21771084).
文摘Rice husk ash(RHA),obtained by pyrolysis of rice husks,can be used as a potential reinforcing filler for rubber composites.In this work,ball milling in ethanol(ethanol-assisted milling)was used to hydroxylate the surface of RHA,promoting the graft modification of bis-(γ-triethoxysilylpropyl)-tetrasulfide(Si69).The obtained modified RHA(RHA-EM-Si69)was filled into the natural rubber/butadiene rubber(NR/BR)composites,and the filler-rubber interactions were enhanced.In consequence,RHA-EM-Si69 filled NR/BR composites showed overall improvement in the mechanical properties compared with RHA filled NR/BR composites.The tear strength increased from 13.37 kN/m to 34.71 kN/m,and the tensile strength increased from 1.84 MPa to 7.75 MPa.Carbon black(N774)was also used for comparison under the same conditions.This method provides a potential for promoting the value of RHA in rubber industry.
