Graphene oxide(GO)with one-atom-thick exhibit remarkable molecule sieving properties,but its low permeance flux renders it difficult to be applied in practice as a high-permeance separation membrane.In this study,we d...Graphene oxide(GO)with one-atom-thick exhibit remarkable molecule sieving properties,but its low permeance flux renders it difficult to be applied in practice as a high-permeance separation membrane.In this study,we design complex membrane from covalently crosslinked GO,polydopamine(PDA),and 3-aminopropytriethoxysilane(APTES)as building blocks to fabricate the high-permeance GO-based membrane via the vacuum filtration method.A branched crosslinking product(PDA/APTES)working as a clamp grasped the hydrophilic functional groups(hydroxyl,epoxy,carboxyl)on GO for improving the GO membrane flux.The interlayer structure of the GO membrane was optimized according to the crosslinker concentration,reaction time,initial p H,and temperature for RGO/PDA/APTES(RGPA)in this study.At the optimized reaction conditions including the crosslinker concentration of 1.4 m L/L,the temperature of 80°C,the time of 16 h,and the initial p H of 8.5 for RGPA mixture,the interlayer gallery of RGPA membrane was effectively tunes,endowing high flux ranging from 11.98 L m^(-2)h^(-1)to 1823.97 L m^(-2)h^(-1).Besides,the RGPA membrane ensured the high rejections to dye solutions such as methylene blue(MB)(>99%)and congo red(CR)(>90%).Meanwhile,the superior reusable performance of the RGPA membrane was achieved,together with the rejections for MB and CR to 96.32%and 93.1%after 4 cycles,respectively.Also,the RGPA membrane possessed superior anti-fouling performances for bovine serum albumin(BSA)aqueous solution and excellent stabilities in harsh conditions(p H 3,7 and 11).Grafting the crosslinker onto GO nanosheets exhibits the distinct advantages of achieving the high flux,high rejections to dyes,and superior reusable performance of membranes,posing a great application potential for membrane separation technology in wastewater treatment.展开更多
Metal organic frameworks(MOFs)has broad application prospect in separation,catalysis,and adsorption.By a facile green method,we successfully fabricated prGO@cHKUST-1 composite membrane with the modification of dopamin...Metal organic frameworks(MOFs)has broad application prospect in separation,catalysis,and adsorption.By a facile green method,we successfully fabricated prGO@cHKUST-1 composite membrane with the modification of dopamine and orientated growth of MOFs.Mg/AI-layered double hydroxides(Mg/Al-LDHs)was used as a modulator to obtain cubic HKUST-1(cHKUST-1)with excellent morphology and special properties.Scanning Electron Microscopy(SEM),X-ray diffraction(XRD),and Fourier transform infrared spectroscopy(FTIR)etc.characte rization illustrated successful synthesis of cHKUST-1 and composite membranes.Cubic HKUST-1 can tune the inter-layer spacing of graphene oxide(GO)leading increase in hydrophilicity and flux of the membrane.Meanwhile,the reduction effect of PDA and intercalation effect of MOFs could change the stacked way of GO layers,forming several fuzzy pores and more active sites on membrane surface.The prGO@cHKUST-1 membrane has an excellent rejection for methylene blue(MB)(99.5%)and Congo red(CR)(71.2%).Moreover,the modified membra ne exhibited 10 and 5 times higher permeation flux than that of original GO membrane and prGO membrane,respectively.Thus,using orientated growth of MOFs to synthesize GO based composite membrane will provide useful insights in ultrahigh permeation flux membranes of dye and oil-water emulsion separation.展开更多
Colloidally quantum-confined CsPbBr_(3) nanoplatelets(NPLs)exhibit narrow emission linewidths and thickness-tunable photoluminescence,making them ideal candidates for deep-blue perovskite light-emitting diodes(PeLEDs)...Colloidally quantum-confined CsPbBr_(3) nanoplatelets(NPLs)exhibit narrow emission linewidths and thickness-tunable photoluminescence,making them ideal candidates for deep-blue perovskite light-emitting diodes(PeLEDs).However,the weak surface coordination of conventional long-chain ligands(e.g.,oleylamine and oleic acid)leads to face-to-face stacking of the NPLs,resulting in undesirable emission redshifts in their PeLEDs.Herein,we report an efficient deep-blue PeLED based on colloidal CsPbBr3 NPLs that meet the Rec.2020 color standard,enabled by an acid-assisted ligand passivation strategy.Surface chemical analysis reveals that hydrobromic acid facilitates proton-assisted stripping of the long-chain ligands,followed by the formation of stable Pb-S-P coordination bonds with thio-tributylphosphine,which exhibits a high adsorption energy(E_(ads)=-1.13 eV).This approach significantly improves surface defect passivation,yielding a photoluminescence quantum yield of 96%and a narrow 13 nm full-width-at-half-maximum deep-blue emission.Enhanced exciton recombination and reduced defect state density are evidenced by a prolonged photoluminescence lifetime and slower absorption bleach recovery kinetics.The resulting PeLEDs achieve record-breaking performance among CsPbBr_(3)NPL-based systems,with a maximum external quantum efficiency of 6.81%at 461 nm,a peak luminance of 143 cd m^(-2),and the CIE color coordinates(CIE-y=0.046)that comply with Rec.2020 standards.This work presents an effective strategy for developing efficient and stable deep-blue perovskite emitters,demonstrating significant potential for the commercialization of perovskite nanomaterials in next-generation ultra-high-definition displays.展开更多
It is terribly wrong to make patients serve doctors,which means they are treated as sources of medical experience.Poctors should treat patients equally.Less educated and inarticulate patients need more help,care and l...It is terribly wrong to make patients serve doctors,which means they are treated as sources of medical experience.Poctors should treat patients equally.Less educated and inarticulate patients need more help,care and love.Patients'interest is always the priority,including,not to abuse doctors'power for personal gains,or to gain anything directly or indirectly from patients.To win a patient's trust,we have to understand him or her,his or her understanding about the illness."Professor Qi Fang(方圻)always repeated those views,which have profound implications(Fang,2002).展开更多
基金financial support from the Sichuan Youth Science and Technology Innovation Research Team(No.2020JDTD0018)the Regional Innovation Cooperation project of Sichuan Province(No.2021YFQ0046)+2 种基金the Science and Technology Plan Project of Sichuan Province(No.2019YJ0302)the National Natural Science Foundation of China(No.21707111)The Opening Project of Oil&Gas Field Chemistry Key Laboratory of Sichuan Province(No.YQKF202106)。
文摘Graphene oxide(GO)with one-atom-thick exhibit remarkable molecule sieving properties,but its low permeance flux renders it difficult to be applied in practice as a high-permeance separation membrane.In this study,we design complex membrane from covalently crosslinked GO,polydopamine(PDA),and 3-aminopropytriethoxysilane(APTES)as building blocks to fabricate the high-permeance GO-based membrane via the vacuum filtration method.A branched crosslinking product(PDA/APTES)working as a clamp grasped the hydrophilic functional groups(hydroxyl,epoxy,carboxyl)on GO for improving the GO membrane flux.The interlayer structure of the GO membrane was optimized according to the crosslinker concentration,reaction time,initial p H,and temperature for RGO/PDA/APTES(RGPA)in this study.At the optimized reaction conditions including the crosslinker concentration of 1.4 m L/L,the temperature of 80°C,the time of 16 h,and the initial p H of 8.5 for RGPA mixture,the interlayer gallery of RGPA membrane was effectively tunes,endowing high flux ranging from 11.98 L m^(-2)h^(-1)to 1823.97 L m^(-2)h^(-1).Besides,the RGPA membrane ensured the high rejections to dye solutions such as methylene blue(MB)(>99%)and congo red(CR)(>90%).Meanwhile,the superior reusable performance of the RGPA membrane was achieved,together with the rejections for MB and CR to 96.32%and 93.1%after 4 cycles,respectively.Also,the RGPA membrane possessed superior anti-fouling performances for bovine serum albumin(BSA)aqueous solution and excellent stabilities in harsh conditions(p H 3,7 and 11).Grafting the crosslinker onto GO nanosheets exhibits the distinct advantages of achieving the high flux,high rejections to dyes,and superior reusable performance of membranes,posing a great application potential for membrane separation technology in wastewater treatment.
基金the key projects of science and technology of Science&Technology Department of Sichuan Province(No.2018GZ0421)。
文摘Metal organic frameworks(MOFs)has broad application prospect in separation,catalysis,and adsorption.By a facile green method,we successfully fabricated prGO@cHKUST-1 composite membrane with the modification of dopamine and orientated growth of MOFs.Mg/AI-layered double hydroxides(Mg/Al-LDHs)was used as a modulator to obtain cubic HKUST-1(cHKUST-1)with excellent morphology and special properties.Scanning Electron Microscopy(SEM),X-ray diffraction(XRD),and Fourier transform infrared spectroscopy(FTIR)etc.characte rization illustrated successful synthesis of cHKUST-1 and composite membranes.Cubic HKUST-1 can tune the inter-layer spacing of graphene oxide(GO)leading increase in hydrophilicity and flux of the membrane.Meanwhile,the reduction effect of PDA and intercalation effect of MOFs could change the stacked way of GO layers,forming several fuzzy pores and more active sites on membrane surface.The prGO@cHKUST-1 membrane has an excellent rejection for methylene blue(MB)(99.5%)and Congo red(CR)(71.2%).Moreover,the modified membra ne exhibited 10 and 5 times higher permeation flux than that of original GO membrane and prGO membrane,respectively.Thus,using orientated growth of MOFs to synthesize GO based composite membrane will provide useful insights in ultrahigh permeation flux membranes of dye and oil-water emulsion separation.
基金supported by Guangxi Science and Technology Major Project(No.AA23073018)the Outstanding Youth Fund of Guangxi Natural Science Foundation(2022GXNSFFA035032)the National Natural Science Foundation of China(12174075,62165001,62475054).
文摘Colloidally quantum-confined CsPbBr_(3) nanoplatelets(NPLs)exhibit narrow emission linewidths and thickness-tunable photoluminescence,making them ideal candidates for deep-blue perovskite light-emitting diodes(PeLEDs).However,the weak surface coordination of conventional long-chain ligands(e.g.,oleylamine and oleic acid)leads to face-to-face stacking of the NPLs,resulting in undesirable emission redshifts in their PeLEDs.Herein,we report an efficient deep-blue PeLED based on colloidal CsPbBr3 NPLs that meet the Rec.2020 color standard,enabled by an acid-assisted ligand passivation strategy.Surface chemical analysis reveals that hydrobromic acid facilitates proton-assisted stripping of the long-chain ligands,followed by the formation of stable Pb-S-P coordination bonds with thio-tributylphosphine,which exhibits a high adsorption energy(E_(ads)=-1.13 eV).This approach significantly improves surface defect passivation,yielding a photoluminescence quantum yield of 96%and a narrow 13 nm full-width-at-half-maximum deep-blue emission.Enhanced exciton recombination and reduced defect state density are evidenced by a prolonged photoluminescence lifetime and slower absorption bleach recovery kinetics.The resulting PeLEDs achieve record-breaking performance among CsPbBr_(3)NPL-based systems,with a maximum external quantum efficiency of 6.81%at 461 nm,a peak luminance of 143 cd m^(-2),and the CIE color coordinates(CIE-y=0.046)that comply with Rec.2020 standards.This work presents an effective strategy for developing efficient and stable deep-blue perovskite emitters,demonstrating significant potential for the commercialization of perovskite nanomaterials in next-generation ultra-high-definition displays.
文摘It is terribly wrong to make patients serve doctors,which means they are treated as sources of medical experience.Poctors should treat patients equally.Less educated and inarticulate patients need more help,care and love.Patients'interest is always the priority,including,not to abuse doctors'power for personal gains,or to gain anything directly or indirectly from patients.To win a patient's trust,we have to understand him or her,his or her understanding about the illness."Professor Qi Fang(方圻)always repeated those views,which have profound implications(Fang,2002).
