The effective valuation of catalyst supports in the catalytic oxidation makes the contribution to understand the support effect of great interest.Here,the role of active substrate in the performance and stability of C...The effective valuation of catalyst supports in the catalytic oxidation makes the contribution to understand the support effect of great interest.Here,the role of active substrate in the performance and stability of CuFe-Co ternary oxides was studied towards the complete catalytic oxidation of CO.The Cu-Fe-Co oxide thin films were deposited on copper grid mesh(CUGM)using one-step pulsed-spray evaporation chemical vapor deposition method.Crystalline structure and morphology analyses revealed nano-crystallite sizes and do me-top-like morphology.Synergistic effects between Cu,Fe and Co,which affect the surface Cu^2+,Fe^3+,Co^3+and chemisorbed oxygen species(O2 and OH)of thin films over the active support and thus result in better reducibility.The thin film catalysts supported on CUGM exhibited attractive catalytic activity compared to the te rnary oxides supported on ine rt grid mesh at a high gas hourly space velocity.Moreove r,the stability in time-on-stream of the ternary oxides on CUGM was evaluated in the CO oxidation for 30 h.The ad opted deposition strategy ofternary oxides on CUGM presents an excessive amount of adsorbed active oxygen species that play an impo rtant role in the complete CO oxidation.The catalysts supported on CUGM showed better catalytic conve rsion than that on inert grid mesh and some literature-reported noble metal oxides as well as transition metal oxides counterparts,revealing the beneficial effect of the CUGM suppo rt in the improvement of the catalytic performance.展开更多
Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival.Various nature inspired sup...Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival.Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation.However,further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment.Herein,we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh(SSCM).The prepared SSCM possesses excellent water repellence and oil affinity,enabling it to successfully separate various oil-water mixtures with high separation efficiency(e.g.,>99%for hexadecane-water mixture).The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures,indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh.Additionally,the efficiency can be well maintained during 50 cycles of separation,and the water repellence is even stable after storage in air for 120 days,demonstrating the reusability and long-term stability of the SSCM.Furthermore,the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper,and oil-water separation efficiency of>96%can be obtained after 10 cycles of abrasion.The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh,and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.展开更多
Fog collection materials have been intensively investigated and can potentially be used to alleviate fresh-water shortages.However,developing highly efficient fog collection materials remains challenging.Requi-site im...Fog collection materials have been intensively investigated and can potentially be used to alleviate fresh-water shortages.However,developing highly efficient fog collection materials remains challenging.Requi-site improvements in fog collection technology are the ultrafast transportation of captured water and the effective regeneration of fresh regions on the surfaces of fog collection materials.Herein,a novel Janus mesh membrane(JMM)with an alternating hydrophobic-superhydrophilic-patterned hydrophobic surface and asymmetric wettability interface is prepared by a selective liquid-phase surface oxidation strategy.The unique structure and high-contrast wettability of the JMM enable ultrafast directional transportation of tiny water droplets(<0.1μL),thereby achieving an excellent water collection efficiency of 15.28 g h^(−1) cm^(−2),which is much higher than those of conventional Janus membranes.The JMM functioned as a versatile fog collector and maintained continuous fog collection regardless of the fog flow direction.This study offers a novel approach for preparing innovative fog collection materials and establishes a founda-tion for developing advanced fog collection systems suitable for diverse applications.展开更多
基金financial support from the MOST(No.2017YFA0402800)the Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of China(No.51888103)。
文摘The effective valuation of catalyst supports in the catalytic oxidation makes the contribution to understand the support effect of great interest.Here,the role of active substrate in the performance and stability of CuFe-Co ternary oxides was studied towards the complete catalytic oxidation of CO.The Cu-Fe-Co oxide thin films were deposited on copper grid mesh(CUGM)using one-step pulsed-spray evaporation chemical vapor deposition method.Crystalline structure and morphology analyses revealed nano-crystallite sizes and do me-top-like morphology.Synergistic effects between Cu,Fe and Co,which affect the surface Cu^2+,Fe^3+,Co^3+and chemisorbed oxygen species(O2 and OH)of thin films over the active support and thus result in better reducibility.The thin film catalysts supported on CUGM exhibited attractive catalytic activity compared to the te rnary oxides supported on ine rt grid mesh at a high gas hourly space velocity.Moreove r,the stability in time-on-stream of the ternary oxides on CUGM was evaluated in the CO oxidation for 30 h.The ad opted deposition strategy ofternary oxides on CUGM presents an excessive amount of adsorbed active oxygen species that play an impo rtant role in the complete CO oxidation.The catalysts supported on CUGM showed better catalytic conve rsion than that on inert grid mesh and some literature-reported noble metal oxides as well as transition metal oxides counterparts,revealing the beneficial effect of the CUGM suppo rt in the improvement of the catalytic performance.
基金This paper was financially supported by National Postdoctoral Program for Innovative Talents(No.BX20190233)China Postdoctoral Science Foundation(No.2019M661012),Tianjin Natural Science Foundation(No.19JCQNJC03900)Research Development Foundation of Tianjin University of Technology and Education(No.KYQD202013).
文摘Reckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival.Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation.However,further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment.Herein,we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh(SSCM).The prepared SSCM possesses excellent water repellence and oil affinity,enabling it to successfully separate various oil-water mixtures with high separation efficiency(e.g.,>99%for hexadecane-water mixture).The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures,indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh.Additionally,the efficiency can be well maintained during 50 cycles of separation,and the water repellence is even stable after storage in air for 120 days,demonstrating the reusability and long-term stability of the SSCM.Furthermore,the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper,and oil-water separation efficiency of>96%can be obtained after 10 cycles of abrasion.The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh,and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.
基金supported by the Scientific Research Funding Project of the Education Department of Liaoning Province(No.LJKZ0351).
文摘Fog collection materials have been intensively investigated and can potentially be used to alleviate fresh-water shortages.However,developing highly efficient fog collection materials remains challenging.Requi-site improvements in fog collection technology are the ultrafast transportation of captured water and the effective regeneration of fresh regions on the surfaces of fog collection materials.Herein,a novel Janus mesh membrane(JMM)with an alternating hydrophobic-superhydrophilic-patterned hydrophobic surface and asymmetric wettability interface is prepared by a selective liquid-phase surface oxidation strategy.The unique structure and high-contrast wettability of the JMM enable ultrafast directional transportation of tiny water droplets(<0.1μL),thereby achieving an excellent water collection efficiency of 15.28 g h^(−1) cm^(−2),which is much higher than those of conventional Janus membranes.The JMM functioned as a versatile fog collector and maintained continuous fog collection regardless of the fog flow direction.This study offers a novel approach for preparing innovative fog collection materials and establishes a founda-tion for developing advanced fog collection systems suitable for diverse applications.
