CuMn_(2)O_(4)spinel has been regarded as a highly efficient sorbent for Hg^(0)capture from flue gas.The regenerability and recyclability of CuMn_(2)O_(4)sorbent are mainly associated with the mercury speciation adsorb...CuMn_(2)O_(4)spinel has been regarded as a highly efficient sorbent for Hg^(0)capture from flue gas.The regenerability and recyclability of CuMn_(2)O_(4)sorbent are mainly associated with the mercury speciation adsorbed on its surface.However,the effect mechanism of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent is still elusive.Experiments were conducted to understand the effect of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent.The results indicate thatCuMn_(2)O_(4)sorbent is a mesoporousmaterial and possesses a good thermal stability.CuMn_(2)O_(4)shows>95%Hg^(0)removal efficiency in a wide temperature window of 50-350℃.The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg^(0)removal performance of CuMn_(2)O_(4)sorbent.CuMn_(2)O_(4)shows a higherHg^(0)adsorption capacity of 4774.57μg/g.Hg^(0)adsorption process over CuMn_(2)O_(4)sorbent can bewell described by the developed kinetic model.Hg^(0)removal efficiency of CuMn_(2)O_(4)sorbent does not depend on the presence of HCl.Mercury species adsorbed on the CuMn_(2)O_(4)sorbent in the presence of HCl mainly exist in the forms of Hg^(O)and HgCl_(2)O_(8)·H_(2)O.HCl shows a significant effect on mercury speciation over CuMn_(2)O_(4)sorbent.Most of Hg^(O)species will be transformed into HgCl_(2)O_(8)·H_(2)O in the presence of HCl.展开更多
Photothermal catalytic oxidation emerges as a promising method for the removal of volatile organic compounds(VOCs).Herein,via sol-gel impregnation method,spinel CuMn_(2)O_(4)was coated on attapulgite honeycombs with i...Photothermal catalytic oxidation emerges as a promising method for the removal of volatile organic compounds(VOCs).Herein,via sol-gel impregnation method,spinel CuMn_(2)O_(4)was coated on attapulgite honeycombs with integrating biochar(BC)film as the second carrier,using chestnut shell as complexation agent.Various mass ratios of CuMn_(2)O_(4)to chestnut shell was modulated to investigate the catalytic toluene degradation performance.Results indicated that the monolithic CuMn_(2)O_(4)/BC/honeycomb catalyst demonstrated superior photothermal catalytic toluene degradation with a low T90(temperature at 90%degradation)of 263°C when the mass ratio of CuMn_(2)O_(4)to biomass was 1:4.The addition of BC film substantially increased the honeycomb's specific surface area and improved the photothermal conversion of spinel,leading to enhanced photothermal catalytic activity.This study presents a cost-effective strategy for eliminating industrial VOCs using clay-biomass based monolithic catalyst.展开更多
基金This work was supported by National Key R&D Program of China(2016YFB0600604)National Natural Science Foundation of China(52006083)Fundamental Research Funds for the Central Universities(2019kfyRCPY021).
文摘CuMn_(2)O_(4)spinel has been regarded as a highly efficient sorbent for Hg^(0)capture from flue gas.The regenerability and recyclability of CuMn_(2)O_(4)sorbent are mainly associated with the mercury speciation adsorbed on its surface.However,the effect mechanism of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent is still elusive.Experiments were conducted to understand the effect of HCl on Hg^(0)transformation over CuMn_(2)O_(4)sorbent.The results indicate thatCuMn_(2)O_(4)sorbent is a mesoporousmaterial and possesses a good thermal stability.CuMn_(2)O_(4)shows>95%Hg^(0)removal efficiency in a wide temperature window of 50-350℃.The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg^(0)removal performance of CuMn_(2)O_(4)sorbent.CuMn_(2)O_(4)shows a higherHg^(0)adsorption capacity of 4774.57μg/g.Hg^(0)adsorption process over CuMn_(2)O_(4)sorbent can bewell described by the developed kinetic model.Hg^(0)removal efficiency of CuMn_(2)O_(4)sorbent does not depend on the presence of HCl.Mercury species adsorbed on the CuMn_(2)O_(4)sorbent in the presence of HCl mainly exist in the forms of Hg^(O)and HgCl_(2)O_(8)·H_(2)O.HCl shows a significant effect on mercury speciation over CuMn_(2)O_(4)sorbent.Most of Hg^(O)species will be transformed into HgCl_(2)O_(8)·H_(2)O in the presence of HCl.
基金supported by the National Natural Science Foundation of China(Grant No.51674043)Jiangsu High Institutions Key Basic Research Projects of Natural Science(Grant No.21KJA430002+2 种基金,Changzhou International Cooperation Project(Grant No.CZ20230018)Foundation of Social Development of Changzhou(Grant No.CE20225063)International Joint Laboratory of the Jiangsu Education Department.
文摘Photothermal catalytic oxidation emerges as a promising method for the removal of volatile organic compounds(VOCs).Herein,via sol-gel impregnation method,spinel CuMn_(2)O_(4)was coated on attapulgite honeycombs with integrating biochar(BC)film as the second carrier,using chestnut shell as complexation agent.Various mass ratios of CuMn_(2)O_(4)to chestnut shell was modulated to investigate the catalytic toluene degradation performance.Results indicated that the monolithic CuMn_(2)O_(4)/BC/honeycomb catalyst demonstrated superior photothermal catalytic toluene degradation with a low T90(temperature at 90%degradation)of 263°C when the mass ratio of CuMn_(2)O_(4)to biomass was 1:4.The addition of BC film substantially increased the honeycomb's specific surface area and improved the photothermal conversion of spinel,leading to enhanced photothermal catalytic activity.This study presents a cost-effective strategy for eliminating industrial VOCs using clay-biomass based monolithic catalyst.
