The development of efficient photocatalysts is of paramount importance for the photocatalytic degradation of organic compounds.An effective approach is to construct heterojunctions with tight interface structures in o...The development of efficient photocatalysts is of paramount importance for the photocatalytic degradation of organic compounds.An effective approach is to construct heterojunctions with tight interface structures in order to enhance interfacial charge transfer and achieve high photocatalytic activity.A magnetically recyclable photocatalytic composite,comprising Ag_(3)PO_(4)/CoFe_(1.95)Dy_(0.05)O_(4)(AP/CFDO)S-scheme heterojunction,was synthesized using a simple hydrothermal method.The composition,microstructure and photoelectrochemical properties of the nanocomposites were comprehensively characterized by various advanced characterization methods.The photocatalytic activity of the AP/CFDO nanocomposites was investigated by subjecting methylene blue(MB)to degradation.The results demonstrated that AP/CFDO exhibited high degradation efficiency in the catalytic degradation of MB,with a degradation efficiency of 99.8%achieved within 30 min under visible light irradiation.Furthermore,after five repeated experiments,the degradation efficiency of MB under visible light irradiation remained at 90%.Furthermore,the degradation process followed the first-order kinetic reaction model,with a rate constant of 0.14042 min^(-1),which was 2.47 and 10.77 times that of Ag_(3)PO_(4)(AP,0.05678 min^(-1))and CFDO(0.01304 min^(-1)).This phenomenon can be attributed to the S-scheme heterojunction constructed between AP and CFDO,which enables the effective spatial separation and transfer of photogenerated carriers.Finally,the reaction mechanism of photocatalytic degradation of MB was studied by adding different free radical scavengers.The results of capture experiments showed that superoxide radicals and hydroxyl radicals were the main active substances in the process of photocatalytic degradation.展开更多
A compact linearly polarized, low-noise, narrow-linewidth, single-frequency fiber laser at 1950nm is demonstrated. This compact fiber laser is based on a 21-mm-long homemade Tm3＋-doped germanate glass fiber. Over 100...A compact linearly polarized, low-noise, narrow-linewidth, single-frequency fiber laser at 1950nm is demonstrated. This compact fiber laser is based on a 21-mm-long homemade Tm3＋-doped germanate glass fiber. Over 100-mW stable continuous-wave single transverse and longitudinal mode lasing at 195Ohm are achieved. The measured relative intensity noise is less than -135dB/Hz at frequencies over 5 MHz. The signal-to-noise ratio of the laser is larger than 72dB, and the laser linewidth is less than 6kHz, while the obtained linear polarization extinction ratio is higher than 22 dB.展开更多
基金Supported by 2023 Anhui Modern Coal Processing Technology Research Institute Open Fund Project(MTY202305)。
文摘The development of efficient photocatalysts is of paramount importance for the photocatalytic degradation of organic compounds.An effective approach is to construct heterojunctions with tight interface structures in order to enhance interfacial charge transfer and achieve high photocatalytic activity.A magnetically recyclable photocatalytic composite,comprising Ag_(3)PO_(4)/CoFe_(1.95)Dy_(0.05)O_(4)(AP/CFDO)S-scheme heterojunction,was synthesized using a simple hydrothermal method.The composition,microstructure and photoelectrochemical properties of the nanocomposites were comprehensively characterized by various advanced characterization methods.The photocatalytic activity of the AP/CFDO nanocomposites was investigated by subjecting methylene blue(MB)to degradation.The results demonstrated that AP/CFDO exhibited high degradation efficiency in the catalytic degradation of MB,with a degradation efficiency of 99.8%achieved within 30 min under visible light irradiation.Furthermore,after five repeated experiments,the degradation efficiency of MB under visible light irradiation remained at 90%.Furthermore,the degradation process followed the first-order kinetic reaction model,with a rate constant of 0.14042 min^(-1),which was 2.47 and 10.77 times that of Ag_(3)PO_(4)(AP,0.05678 min^(-1))and CFDO(0.01304 min^(-1)).This phenomenon can be attributed to the S-scheme heterojunction constructed between AP and CFDO,which enables the effective spatial separation and transfer of photogenerated carriers.Finally,the reaction mechanism of photocatalytic degradation of MB was studied by adding different free radical scavengers.The results of capture experiments showed that superoxide radicals and hydroxyl radicals were the main active substances in the process of photocatalytic degradation.
基金Supported by the National High-Technology Research and Development Program of China under Grant Nos 2013AA031502 and 2014AA041902the National Natural Science Foundation of China under Grant Nos 11174085,51132004,and 51302086+3 种基金the Natural Science Foundation of Guangdong Province under Grant Nos S2011030001349 and S20120011380the China National Funds for Distinguished Young Scientists under Grant No 61325024the Science and Technology Project of Guangdong Province under Grant No 2013B090500028the ’Cross and Cooperative’ Science and Technology Innovation Team Project of Chinese Academy of Sciences under Grant No 2012-119
文摘A compact linearly polarized, low-noise, narrow-linewidth, single-frequency fiber laser at 1950nm is demonstrated. This compact fiber laser is based on a 21-mm-long homemade Tm3＋-doped germanate glass fiber. Over 100-mW stable continuous-wave single transverse and longitudinal mode lasing at 195Ohm are achieved. The measured relative intensity noise is less than -135dB/Hz at frequencies over 5 MHz. The signal-to-noise ratio of the laser is larger than 72dB, and the laser linewidth is less than 6kHz, while the obtained linear polarization extinction ratio is higher than 22 dB.
