In the metal-based peroxymonosulfate(PMS)activation process,the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant removal.Herein,Codoped CuWO 4/BN quantum dot...In the metal-based peroxymonosulfate(PMS)activation process,the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant removal.Herein,Codoped CuWO 4/BN quantum dots(CW/Co/BNQDs)photocatalysts were developed to realize Cu^(2+)/Cu+and Co^(2+)/Co^(3+)dual ions redox cycles for PMS activation,which would facilitate the tetracycline(TC)removal.CW/4Co/2BNQDs could degrade 94.8%TC within 30 min in PMS/Vis system,and the apparent rate constant of CW/4Co/2BNQDs was 2.7 times and 1.2 times higher than those of CW and CW/4Co,respectively.The improved TC degradation performance could be attributed to the synergetic effect between BNQDs and dual redox cycles.X-ray photoelectron spectroscopy(XPS)spectra of samples before and after the reaction demonstrated that BNQDs were beneficial for accelerating the Cu^(2+)/Cu+and Co^(2+)/Co^(3+)redox cycles in CW/4Co/2BNQDs,further boosting the activation of PMS in TC degradation.Experiments of different radical scavengers revealed that the SO_(4)^(·−)/·OH/h+/^(1)O_(2)reactive species participated in the PMS activation for the TC degradation process.The possible TC degradation pathway and intermediate toxicity were detailed investigated.In addition,CW/4Co/2BNQDs exhibited outstanding photocatalytic activity over five consecutive cycles,which illustrated that it was supposed to be a reliable PMS activator over antibiotic elimination for practical application.And this work shed new light on constructing dual redox cycles for efficient PMS activation.展开更多
分布式发电系统通过将各种不同的能源形式转换为电能加以利用,是分布式能源最有效的利用方式之一。全钒液流电池是大型的电力存储系统,在分布式电源中有许多潜在的应用。介绍了微电网的系统结构,阐述了储能电池的作用,设计了5 k W全钒...分布式发电系统通过将各种不同的能源形式转换为电能加以利用,是分布式能源最有效的利用方式之一。全钒液流电池是大型的电力存储系统,在分布式电源中有许多潜在的应用。介绍了微电网的系统结构,阐述了储能电池的作用,设计了5 k W全钒液流电池放电系统的双环控制系统,详细分析了电流内环和电压外环控制器的设计过程。基于全钒液流电池的等效电路模型和放电特性,利用Matlab搭建了5 k W全钒液流电池放电系统的仿真电路,仿真表明了设计的合理性。展开更多
基金the financial support of this work from the National Natural Science Foundation of China(No.22172064)the Special Fund Project of Jiangsu Province for Scientific and Technological Innovation in Carbon Peaking and Carbon Neutrality(BK20220023)+1 种基金the foundation of Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,Jiangnan University(No.1042050205225990/009)National Laboratory of Solid State Microstructures,Nanjing University(No.M34047).
文摘In the metal-based peroxymonosulfate(PMS)activation process,the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant removal.Herein,Codoped CuWO 4/BN quantum dots(CW/Co/BNQDs)photocatalysts were developed to realize Cu^(2+)/Cu+and Co^(2+)/Co^(3+)dual ions redox cycles for PMS activation,which would facilitate the tetracycline(TC)removal.CW/4Co/2BNQDs could degrade 94.8%TC within 30 min in PMS/Vis system,and the apparent rate constant of CW/4Co/2BNQDs was 2.7 times and 1.2 times higher than those of CW and CW/4Co,respectively.The improved TC degradation performance could be attributed to the synergetic effect between BNQDs and dual redox cycles.X-ray photoelectron spectroscopy(XPS)spectra of samples before and after the reaction demonstrated that BNQDs were beneficial for accelerating the Cu^(2+)/Cu+and Co^(2+)/Co^(3+)redox cycles in CW/4Co/2BNQDs,further boosting the activation of PMS in TC degradation.Experiments of different radical scavengers revealed that the SO_(4)^(·−)/·OH/h+/^(1)O_(2)reactive species participated in the PMS activation for the TC degradation process.The possible TC degradation pathway and intermediate toxicity were detailed investigated.In addition,CW/4Co/2BNQDs exhibited outstanding photocatalytic activity over five consecutive cycles,which illustrated that it was supposed to be a reliable PMS activator over antibiotic elimination for practical application.And this work shed new light on constructing dual redox cycles for efficient PMS activation.
文摘分布式发电系统通过将各种不同的能源形式转换为电能加以利用,是分布式能源最有效的利用方式之一。全钒液流电池是大型的电力存储系统,在分布式电源中有许多潜在的应用。介绍了微电网的系统结构,阐述了储能电池的作用,设计了5 k W全钒液流电池放电系统的双环控制系统,详细分析了电流内环和电压外环控制器的设计过程。基于全钒液流电池的等效电路模型和放电特性,利用Matlab搭建了5 k W全钒液流电池放电系统的仿真电路,仿真表明了设计的合理性。
