The kinetic competition between electron-hole recombination and water oxidation is a key limitation for the development of efficient solar water splitting materials. In this study, we present a solution for solving th...The kinetic competition between electron-hole recombination and water oxidation is a key limitation for the development of efficient solar water splitting materials. In this study, we present a solution for solving this challenge by constructing a quantum dot-intercalated nanostructure. For the first time, we show the interlayer charge of the intercalated nanostructure can significantly inhibit the electron-hole recombination in photocatalysis. For Bi2WO6 quantum dots （QDs） intercalated in a montmorillonite （MMT） nanostructure as an example, the average lifetime of the photogenerated charge carriers was increased from 3.06 μs to 18.8 Ds by constructing the intercalated nanostructure. The increased lifetime markedly improved the photocatalytic performance of Bi2WO6 both in solar water oxidation and environmental purification. This work not oMy provides a method to produce QD-intercalated ultrathin nanostructures but also a general route to design efficient semiconductor-based photoconversion materials for solar fuel generation and environmental purification.展开更多
本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域...本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域氨氮自净能力比中下游流域的自净能力好，古田溪断面的氨氮平均降解系数低于全国的平均值，说明氨氮自净能力相对较弱，本研究为确定流域水环境容量和纳污能力及制定污染物总量控制提供科学依据。展开更多
Nine strains of ammonia nitrogen degradation strains from C1 to C9 were isolated from industrial wastewater to study their degradation and conversion of ammonia nitrogen. The results showed that C2 strain with a high ...Nine strains of ammonia nitrogen degradation strains from C1 to C9 were isolated from industrial wastewater to study their degradation and conversion of ammonia nitrogen. The results showed that C2 strain with a high degradation activiity of ammonia nitrogen, and the ammonia nitrogen degradation rate of the activated C2 strain was 93% within 24 h when the initial concentration of ammonia nitrogen was 200 mg/L under the conditions of inoculation 10%, temperature 35?C, pH 7.0, rotation 200 r/min. And C2 was identified as Bacillus amyloliquefaciens.展开更多
基金This work was financially supported by the National Basic Research Program of China （Grant Nos. 2010CB933503, 2013CB933203）, the National Natural Science Foundation of China （Grant Nos. 51102262, 51272269）, and the Science Foundation for Youth Scholars of the State Key Laboratory of High Performance Ceramics and Superfine Microstructures （Grant No. SKL201204）.
文摘The kinetic competition between electron-hole recombination and water oxidation is a key limitation for the development of efficient solar water splitting materials. In this study, we present a solution for solving this challenge by constructing a quantum dot-intercalated nanostructure. For the first time, we show the interlayer charge of the intercalated nanostructure can significantly inhibit the electron-hole recombination in photocatalysis. For Bi2WO6 quantum dots （QDs） intercalated in a montmorillonite （MMT） nanostructure as an example, the average lifetime of the photogenerated charge carriers was increased from 3.06 μs to 18.8 Ds by constructing the intercalated nanostructure. The increased lifetime markedly improved the photocatalytic performance of Bi2WO6 both in solar water oxidation and environmental purification. This work not oMy provides a method to produce QD-intercalated ultrathin nanostructures but also a general route to design efficient semiconductor-based photoconversion materials for solar fuel generation and environmental purification.
文摘本研究采用模拟实验对闽江流域氨氮的降解规律进行研究，降解系数采用稳态一维降解模型进行分析计算，闽江上游流域氨氮的平均降解系数为0.140～0.260 d -1，中下游流域氨氮的平均降解系数为0.099～0.203 d-1。结果表明，闽江上游流域氨氮自净能力比中下游流域的自净能力好，古田溪断面的氨氮平均降解系数低于全国的平均值，说明氨氮自净能力相对较弱，本研究为确定流域水环境容量和纳污能力及制定污染物总量控制提供科学依据。
文摘Nine strains of ammonia nitrogen degradation strains from C1 to C9 were isolated from industrial wastewater to study their degradation and conversion of ammonia nitrogen. The results showed that C2 strain with a high degradation activiity of ammonia nitrogen, and the ammonia nitrogen degradation rate of the activated C2 strain was 93% within 24 h when the initial concentration of ammonia nitrogen was 200 mg/L under the conditions of inoculation 10%, temperature 35?C, pH 7.0, rotation 200 r/min. And C2 was identified as Bacillus amyloliquefaciens.
