Ag/AgCl/TiO^(2)nanocomposite was synthesized through the combination of sol-gel process and hydrothermal(HT)method followed by ion exchange method in the paper.Transmission electron microscope,UVevis absorption proper...Ag/AgCl/TiO^(2)nanocomposite was synthesized through the combination of sol-gel process and hydrothermal(HT)method followed by ion exchange method in the paper.Transmission electron microscope,UVevis absorption property and X-ray diffraction were utilized to characterize the morphology,optical absorption property and phase structure of the as-prepared photocatalysts.The morphological and performance studies of Ag/AgCl/TiO^(2)revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO^(2)and the subsequent ion exchange method.By the degradation of Rhodamine B under xenon lamp,Ag/AgCl/TiO^(2)exhibited a significant enhancement in photocatalytic activity compared with TiO^(2)and Ag/TiO^(2).The band gap of Ag/AgCl/TiO^(2)can reach to 2.53eV compared with 3.22eV of the prepared TiO^(2).Furthermore,the synthesis process and photoreaction mechanisms of TiO^(2),Ag/TiO^(2)and Ag/AgCl/TiO^(2)photocatalysts were proposed.It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO^(2).展开更多
In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to su...In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to supply the desalinated water by mixedbed The electric regeneration technology is a new one used for regeneration of theexhausted ion exchangers in the mixed bed instead of the traditional regeneratingprocess by using acid and abc liquor Electric energy is consumed to regenerat theion exchangers loaded by salts from water treatment without any chemicals- acid alkali. The advantage of the electric regeneration process edibited convenientoperation, no discharge any waste, and therefore no Polluted to the recehang waterbode and the environmental ground展开更多
α-Ag_(2)WO_(4)clusters comprising an assembly of nanorods were controllably fabricated via a simple ion exchange method at room temperature.The phase,morphology,microstructure,optical absorption,photoluminescence,pho...α-Ag_(2)WO_(4)clusters comprising an assembly of nanorods were controllably fabricated via a simple ion exchange method at room temperature.The phase,morphology,microstructure,optical absorption,photoluminescence,photoelectrochemical properties and photocatalytic behavior of the products were systematically explored.α-Ag_(2)WO_(4)nanorod-clusters of high purity are achieved at a medium pH of 9.8 provided by adjusting the molar ratio of AgNO_(3)and Na_(2)WO_(4)to 1:4,and the sample exhibits superior photocatalytic activity for the degradation of organic pollutants.Its rate constant k is as high as 21.8 fold in comparison with that of the sample obtained with stoichiometric raw materials at a ratio of 1:0.5.The boosted photoactivity ofα-Ag_(2)WO_(4)clusters can be well accounted for by the broadened light harvesting and accelerated charge separation,which are proved by the red-shifted light absorption,higher photocurrent and a smaller Nyquist impedance radius.Based on the detected active species and the band edge positions,a possible migration mechanism of photoinduced e−/h+pairs on the surface ofα-Ag_(2)WO_(4)clusters was proposed.This work provides some new insights into the rational design and synthesis of photocatalysts with a deep understanding of the relationship among the experimental parameters,the microstructure and properties to acquire a more desired photoactivity.展开更多
The development of high loading single-atom electrocatalysts presents significant potential for enhancing the performance of the acidic oxygen evolution reaction(OER).Herein,a high loading(7.98 wt%)iridium single atom...The development of high loading single-atom electrocatalysts presents significant potential for enhancing the performance of the acidic oxygen evolution reaction(OER).Herein,a high loading(7.98 wt%)iridium single atom doped NiCo_(2)O_(4)(IrH-NiCo_(2)O_(4))catalyst was prepared using an ion-exchange pyrolysis method.The optimized IrH-NiCo_(2)O_(4)demonstrated an enhanced OER performance,achieving an overpotential of 240 mV at a current density of 10 mA cm^(−2),along with exceptional stability for over 282 hours in a 0.5 M H_(2)SO_(4)solution.Additionally,it demonstrated an overall mass activity of 377.05 mA mgIr^(−1)at a 300 mV OER overpotential,surpassing the performance of commercial IrO_(2).Density functional theory calculations revealed that the high-density of Ir-single atom doping enhances the adsorption energy of oxygen-containing intermediates,thereby promoting the OER process.This study offers a viable strategy for fabricating high-loading single-atom catalysts,offering insights that can be generalized to other systems and paving the way for advancing their industrial-scale applications.展开更多
基金the National Natural Science Foundation of China under Grant No.51762028 and No.11504146.
文摘Ag/AgCl/TiO^(2)nanocomposite was synthesized through the combination of sol-gel process and hydrothermal(HT)method followed by ion exchange method in the paper.Transmission electron microscope,UVevis absorption property and X-ray diffraction were utilized to characterize the morphology,optical absorption property and phase structure of the as-prepared photocatalysts.The morphological and performance studies of Ag/AgCl/TiO^(2)revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO^(2)and the subsequent ion exchange method.By the degradation of Rhodamine B under xenon lamp,Ag/AgCl/TiO^(2)exhibited a significant enhancement in photocatalytic activity compared with TiO^(2)and Ag/TiO^(2).The band gap of Ag/AgCl/TiO^(2)can reach to 2.53eV compared with 3.22eV of the prepared TiO^(2).Furthermore,the synthesis process and photoreaction mechanisms of TiO^(2),Ag/TiO^(2)and Ag/AgCl/TiO^(2)photocatalysts were proposed.It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO^(2).
文摘In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to supply the desalinated water by mixedbed The electric regeneration technology is a new one used for regeneration of theexhausted ion exchangers in the mixed bed instead of the traditional regeneratingprocess by using acid and abc liquor Electric energy is consumed to regenerat theion exchangers loaded by salts from water treatment without any chemicals- acid alkali. The advantage of the electric regeneration process edibited convenientoperation, no discharge any waste, and therefore no Polluted to the recehang waterbode and the environmental ground
基金supported by the National Natural Science Foundation of China(No.21303122).
文摘α-Ag_(2)WO_(4)clusters comprising an assembly of nanorods were controllably fabricated via a simple ion exchange method at room temperature.The phase,morphology,microstructure,optical absorption,photoluminescence,photoelectrochemical properties and photocatalytic behavior of the products were systematically explored.α-Ag_(2)WO_(4)nanorod-clusters of high purity are achieved at a medium pH of 9.8 provided by adjusting the molar ratio of AgNO_(3)and Na_(2)WO_(4)to 1:4,and the sample exhibits superior photocatalytic activity for the degradation of organic pollutants.Its rate constant k is as high as 21.8 fold in comparison with that of the sample obtained with stoichiometric raw materials at a ratio of 1:0.5.The boosted photoactivity ofα-Ag_(2)WO_(4)clusters can be well accounted for by the broadened light harvesting and accelerated charge separation,which are proved by the red-shifted light absorption,higher photocurrent and a smaller Nyquist impedance radius.Based on the detected active species and the band edge positions,a possible migration mechanism of photoinduced e−/h+pairs on the surface ofα-Ag_(2)WO_(4)clusters was proposed.This work provides some new insights into the rational design and synthesis of photocatalysts with a deep understanding of the relationship among the experimental parameters,the microstructure and properties to acquire a more desired photoactivity.
基金the National Natural Science Foundation of China(No.12034002,22279044 and 22202080)the Jilin Province Science and Technology Development Program(20210301009GX).
文摘The development of high loading single-atom electrocatalysts presents significant potential for enhancing the performance of the acidic oxygen evolution reaction(OER).Herein,a high loading(7.98 wt%)iridium single atom doped NiCo_(2)O_(4)(IrH-NiCo_(2)O_(4))catalyst was prepared using an ion-exchange pyrolysis method.The optimized IrH-NiCo_(2)O_(4)demonstrated an enhanced OER performance,achieving an overpotential of 240 mV at a current density of 10 mA cm^(−2),along with exceptional stability for over 282 hours in a 0.5 M H_(2)SO_(4)solution.Additionally,it demonstrated an overall mass activity of 377.05 mA mgIr^(−1)at a 300 mV OER overpotential,surpassing the performance of commercial IrO_(2).Density functional theory calculations revealed that the high-density of Ir-single atom doping enhances the adsorption energy of oxygen-containing intermediates,thereby promoting the OER process.This study offers a viable strategy for fabricating high-loading single-atom catalysts,offering insights that can be generalized to other systems and paving the way for advancing their industrial-scale applications.
