Inefficient charge separation and limited light absorption are two critical issues associated with high‐efficiency photocatalytic H2production using TiO2.Surface defects within a certain concentration range in photoc...Inefficient charge separation and limited light absorption are two critical issues associated with high‐efficiency photocatalytic H2production using TiO2.Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity.In this study,surface defects(oxygen vacancies and metal cation replacement defects)were induced with a facile and effective approach by surface doping with low‐cost transition metals(Co,Ni,Cu,and Mn)on ultrafine TiO2.The obtained surface‐defective TiO2exhibited a3–4‐fold improved activity compared to that of the original ultrafine TiO2.In addition,a H2production rate of3.4μmol/h was obtained using visible light(λ>420nm)irradiation.The apparent quantum yield(AQY)at365nm reached36.9%over TiO2‐Cu,significantly more than the commercial P25TiO2.The enhancement of photocatalytic H2production activity can be attributed to improved rapid charge separation efficiency andexpanded light absorption window.This hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.展开更多
4＂,7-Dimethoxy-N-methylisoflavone-3＂-sulfonamide （3） was synthesized by a two step synthesis method and characterized via IR and 1H NMR. Its chemical structure was determined by X-ray single-crystal diffraction. I...4＂,7-Dimethoxy-N-methylisoflavone-3＂-sulfonamide （3） was synthesized by a two step synthesis method and characterized via IR and 1H NMR. Its chemical structure was determined by X-ray single-crystal diffraction. It crystallizes in monoclinic, space group C2/c with a = 27.677（13）, b= 10.490（5）, c = 13.982（7） A, β = 118.781 （9）°, V = 3558（3） A3, Z = 8, F（000） = 1568, Dc = 1.401 Mg/m3, Mr = 375.39,/t = 0.217 mm-1, 2 = 0.71073 A, the final R = 0.0436 and wR = 0.0910 for 3168 observed reflections with 1〉 2δ（/）. The compound was studied subsequently for the potent neuroprotective activity, and showed effects against oxygen-glucose deprivation injury in PC12 cells in a dose-dependent manner （protection： 42.5% at 100 μg-mL-1, 35.1% at 10 μg-mL-1 and 22.5% at 1 μg·mL-1）.展开更多
基金supported by the Double First‐rate Subject‐Food Science and Engineering Program of Hebei Province (2018SPGCA18)Young Tip‐top Talents Plan of Universities and Colleges in Hebei Province of China (BJ2017026)the Specific Foundation for Doctor in Hebei Agriculture University of China (ZD201709)~~
文摘Inefficient charge separation and limited light absorption are two critical issues associated with high‐efficiency photocatalytic H2production using TiO2.Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity.In this study,surface defects(oxygen vacancies and metal cation replacement defects)were induced with a facile and effective approach by surface doping with low‐cost transition metals(Co,Ni,Cu,and Mn)on ultrafine TiO2.The obtained surface‐defective TiO2exhibited a3–4‐fold improved activity compared to that of the original ultrafine TiO2.In addition,a H2production rate of3.4μmol/h was obtained using visible light(λ>420nm)irradiation.The apparent quantum yield(AQY)at365nm reached36.9%over TiO2‐Cu,significantly more than the commercial P25TiO2.The enhancement of photocatalytic H2production activity can be attributed to improved rapid charge separation efficiency andexpanded light absorption window.This hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.
基金supported by grants from the project of the education department of Shaanxi Province(No.2013JK0839)
文摘4＂,7-Dimethoxy-N-methylisoflavone-3＂-sulfonamide （3） was synthesized by a two step synthesis method and characterized via IR and 1H NMR. Its chemical structure was determined by X-ray single-crystal diffraction. It crystallizes in monoclinic, space group C2/c with a = 27.677（13）, b= 10.490（5）, c = 13.982（7） A, β = 118.781 （9）°, V = 3558（3） A3, Z = 8, F（000） = 1568, Dc = 1.401 Mg/m3, Mr = 375.39,/t = 0.217 mm-1, 2 = 0.71073 A, the final R = 0.0436 and wR = 0.0910 for 3168 observed reflections with 1〉 2δ（/）. The compound was studied subsequently for the potent neuroprotective activity, and showed effects against oxygen-glucose deprivation injury in PC12 cells in a dose-dependent manner （protection： 42.5% at 100 μg-mL-1, 35.1% at 10 μg-mL-1 and 22.5% at 1 μg·mL-1）.
