Ultraviolet/persulfate (UV/PS) and Ultraviolet/hydrogen peroxide (UV/H_(2)O_(2)) have attracted much attention in recent years as advanced oxidation processes for water treatment.However,it is not all clear how these ...Ultraviolet/persulfate (UV/PS) and Ultraviolet/hydrogen peroxide (UV/H_(2)O_(2)) have attracted much attention in recent years as advanced oxidation processes for water treatment.However,it is not all clear how these two methods affect the formation of cyanogen chloride(CNCl) in the subsequent water chlorination process.In this study,it was found that both UV/H_(2)O_(2)and UV/PS pre-oxidation promoted the formation of CNCl in six actual water samples collected from urban rivers.Glycine,uric acid,arginine and histidine were investigated as the model compounds to explore the effects of different methods on the production of CNCl.The results showed that compared with chlorination alone,pre-oxidation by UV/H_(2)O_(2)and UV/PS can reduce the production of CNCl for glycine and uric acid by up to 95%during post-chlorination process.However,they can greatly promote the formation of CNCl for arginine and histidine by up to 120-fold.In a more detailed investigation,pre-oxidation of histidine formed highly reactive intermediates to chlorine,leading to increased CNCl formation and chlorine consumption.The results showed that the precursors of CNCl was altered after pre-oxidation,and need to be re-evaluated.展开更多
CO_(2) methanation has a potential in the large-scale utilization of carbon dioxide.It has also been considered to be useful for the renewable energy storage.The commercial pipeline for natural gas transportation can ...CO_(2) methanation has a potential in the large-scale utilization of carbon dioxide.It has also been considered to be useful for the renewable energy storage.The commercial pipeline for natural gas transportation can be directly applied for the methane product of CO_(2) methanation.The supported ruthenium(Ru)catalyst has been confirmed to be active and stable for CO_(2) methanation with its high ability in the dissociation of hydrogen and the strong binding of carbon monoxide.CO_(2) methanation over the supported Ru catalyst is structure sensitive.The size of the Ru catalyst and the support have significant effects on the activity and the mechanism.A significant challenge re-mained is the structural controllable preparation of the supported Ru catalyst toward a sufficiently high low-temperature activity.In this review,the recent progresses in the investigations of the supported Ru catalysts for CO_(2) methanation are summarized.The challenges and the future devel-opments are also discussed.展开更多
Current liquid embolic agents face several challenges,including poor biocompatibility and vascular recanali-zation.Herein,we propose an innovative liquid embolic agent composed of a coenzyme-based polymer(poly lipoic ...Current liquid embolic agents face several challenges,including poor biocompatibility and vascular recanali-zation.Herein,we propose an innovative liquid embolic agent composed of a coenzyme-based polymer(poly lipoic acid,PLA)and a biocompatible solvent(deep eutectic solvent,DES).The agent undergoes phase trans-formation to form a stable hydrogel in situ through solvent exchange with water,thereby enabling safe and effective embolization.First,DES is obtained by heating a mixture of choline chloride(ChCl)and glycerol(Gly).Subsequently,lipoic acid(LA)is incorporated into the DES and heated to produce the PLA/DES complex.Owing to the strong hydrogen bonding between the DES and PLA,the DES acts as a solvent while also inhibiting PLA depolymerization.Upon contact with blood,most of the DES exchange with water,whereas some amount of ChCl integrates within the PLA via strong hydrogen bonding.This hydrogen bonding not only prevents PLA depoly-merization but also reinforces the PLA network,resulting in a stable PLA hydrogel rather than depolymerized LA monomers.Furthermore,liquid-metal(LM)nanoparticles are incorporated to fabricate radiopaque PLA/LM/DES.PLA/LM/DES shows better in vitro hemocompatibility and cytocompatibility,milder inflammatory response in a rat model,and more effective and safer embolization in a rabbit model than a commercial embolic agent(Onyx).Thus,this work provides an innovative liquid embolic agent and broadens the biomedical ap-plications of DES.展开更多
In this paper,we study the relationship of balanced pairs in a recollement.As an application of balanced pairs,we introduce the notion of the relative tilting objects,and give a characterization of relative tilting ob...In this paper,we study the relationship of balanced pairs in a recollement.As an application of balanced pairs,we introduce the notion of the relative tilting objects,and give a characterization of relative tilting objects,which is similar to Bazzoni characterization of n-tilting modules.Finally,we investigate the relationship of relative tilting objects in a recollement.展开更多
Protecting the skin from UV light irradiation in wet and underwater environments is challenging due to the weak adhesion of existing sunscreen materials but highly desired.Herein we report a polyethyleneimine/thioctic...Protecting the skin from UV light irradiation in wet and underwater environments is challenging due to the weak adhesion of existing sunscreen materials but highly desired.Herein we report a polyethyleneimine/thioctic acid/titanium dioxide(PEI/TA/TiO_(2))coacervate-derived hydrogel with robust,asymmetric,and reversible wet bioadhesion and effective UV-light-shielding ability.The PEI/TA/TiO_(2)complex coacervate can be easily obtained by mixing a PEI solution and TA/TiO_(2)powder.The fluid PEI/TA/TiO_(2)coacervate deposited on wet skin can spread into surface irregularities and subsequently transform into a hydrogel with increased cohesion,thereby establishing interdigitated contact and adhesion between the bottom surface and skin.Meanwhile,the functional groups between the skin and hydrogel can form physical interactions to further enhance bioadhesion,whereas the limited movement of amine and carboxyl groups on the top hydrogel surface leads to low adhesion.Therefore,the coacervate-derived hydrogel exhibits asymmetric adhesiveness on the bottom and top surfaces.Moreover,the PEI/TA/TiO_(2)hydrogel formed on the skin could be easily removed using a NaHCO3 aqueous solution without inflicting damage.More importantly,the PEI/TA/TiO_(2)hydrogel can function as an effective sunscreen to block UV light and prevent UV-induced MMP-9 overexpression,inflammation,and DNA damage in animal skin.The advantages of PEI/TA/TiO_(2)coacervate-derived hydrogels include robust,asymmetric,and reversible wet bioadhesion,effective UV light-shielding ability,excellent biocompatibility,and easy preparation and usage,making them a promising bioadhesive to protect the skin from UV light-associated damage in wet and underwater environments.展开更多
基金supported by the National Natural Science Foundation of China (No.22076217)the Henan Academy of Sciences 2021 Science and Technology Open Cooperation Project (No.210901007)。
文摘Ultraviolet/persulfate (UV/PS) and Ultraviolet/hydrogen peroxide (UV/H_(2)O_(2)) have attracted much attention in recent years as advanced oxidation processes for water treatment.However,it is not all clear how these two methods affect the formation of cyanogen chloride(CNCl) in the subsequent water chlorination process.In this study,it was found that both UV/H_(2)O_(2)and UV/PS pre-oxidation promoted the formation of CNCl in six actual water samples collected from urban rivers.Glycine,uric acid,arginine and histidine were investigated as the model compounds to explore the effects of different methods on the production of CNCl.The results showed that compared with chlorination alone,pre-oxidation by UV/H_(2)O_(2)and UV/PS can reduce the production of CNCl for glycine and uric acid by up to 95%during post-chlorination process.However,they can greatly promote the formation of CNCl for arginine and histidine by up to 120-fold.In a more detailed investigation,pre-oxidation of histidine formed highly reactive intermediates to chlorine,leading to increased CNCl formation and chlorine consumption.The results showed that the precursors of CNCl was altered after pre-oxidation,and need to be re-evaluated.
文摘CO_(2) methanation has a potential in the large-scale utilization of carbon dioxide.It has also been considered to be useful for the renewable energy storage.The commercial pipeline for natural gas transportation can be directly applied for the methane product of CO_(2) methanation.The supported ruthenium(Ru)catalyst has been confirmed to be active and stable for CO_(2) methanation with its high ability in the dissociation of hydrogen and the strong binding of carbon monoxide.CO_(2) methanation over the supported Ru catalyst is structure sensitive.The size of the Ru catalyst and the support have significant effects on the activity and the mechanism.A significant challenge re-mained is the structural controllable preparation of the supported Ru catalyst toward a sufficiently high low-temperature activity.In this review,the recent progresses in the investigations of the supported Ru catalysts for CO_(2) methanation are summarized.The challenges and the future devel-opments are also discussed.
基金the National Natural Science Foun-dation of China(22205264)the Guangdong-Hong Kong-Macao Uni-versity Joint Laboratory of Interventional Medicine Foundation of Guangdong Province(2023LSYS001)the Hundred Talents Program of Sun Yat-sen University.
文摘Current liquid embolic agents face several challenges,including poor biocompatibility and vascular recanali-zation.Herein,we propose an innovative liquid embolic agent composed of a coenzyme-based polymer(poly lipoic acid,PLA)and a biocompatible solvent(deep eutectic solvent,DES).The agent undergoes phase trans-formation to form a stable hydrogel in situ through solvent exchange with water,thereby enabling safe and effective embolization.First,DES is obtained by heating a mixture of choline chloride(ChCl)and glycerol(Gly).Subsequently,lipoic acid(LA)is incorporated into the DES and heated to produce the PLA/DES complex.Owing to the strong hydrogen bonding between the DES and PLA,the DES acts as a solvent while also inhibiting PLA depolymerization.Upon contact with blood,most of the DES exchange with water,whereas some amount of ChCl integrates within the PLA via strong hydrogen bonding.This hydrogen bonding not only prevents PLA depoly-merization but also reinforces the PLA network,resulting in a stable PLA hydrogel rather than depolymerized LA monomers.Furthermore,liquid-metal(LM)nanoparticles are incorporated to fabricate radiopaque PLA/LM/DES.PLA/LM/DES shows better in vitro hemocompatibility and cytocompatibility,milder inflammatory response in a rat model,and more effective and safer embolization in a rabbit model than a commercial embolic agent(Onyx).Thus,this work provides an innovative liquid embolic agent and broadens the biomedical ap-plications of DES.
基金Supported by the National Natural Science Foundation of China(Grant Nos.11801004,12101003 and 12271249)the Natural Science Foundation of Universities of Anhui(Grant No.2023AH050950)+2 种基金the Top talent project of AHPU in 2020(Grant No.S022021055)the Natural Science Foundation of Anhui province(Grant No.2108085QA07)the Startup Foundation for Introducing Talent of AHPU(Grant No.2020YQQ067)。
文摘In this paper,we study the relationship of balanced pairs in a recollement.As an application of balanced pairs,we introduce the notion of the relative tilting objects,and give a characterization of relative tilting objects,which is similar to Bazzoni characterization of n-tilting modules.Finally,we investigate the relationship of relative tilting objects in a recollement.
基金the National Key Research and Development Program(2022YFB3804403)the Collaborative Research Fund from the Research Grants Council of Hong Kong(Project No.C5044-21G)+1 种基金the Research Grants Council of the Hong Kong Special Administration Region(project no.GRF/14202920,GRF/14204618,GRF/14108720,T13-402/17-N and AoE/M-402/20)National Natural Science Foundation of China(22205264).
文摘Protecting the skin from UV light irradiation in wet and underwater environments is challenging due to the weak adhesion of existing sunscreen materials but highly desired.Herein we report a polyethyleneimine/thioctic acid/titanium dioxide(PEI/TA/TiO_(2))coacervate-derived hydrogel with robust,asymmetric,and reversible wet bioadhesion and effective UV-light-shielding ability.The PEI/TA/TiO_(2)complex coacervate can be easily obtained by mixing a PEI solution and TA/TiO_(2)powder.The fluid PEI/TA/TiO_(2)coacervate deposited on wet skin can spread into surface irregularities and subsequently transform into a hydrogel with increased cohesion,thereby establishing interdigitated contact and adhesion between the bottom surface and skin.Meanwhile,the functional groups between the skin and hydrogel can form physical interactions to further enhance bioadhesion,whereas the limited movement of amine and carboxyl groups on the top hydrogel surface leads to low adhesion.Therefore,the coacervate-derived hydrogel exhibits asymmetric adhesiveness on the bottom and top surfaces.Moreover,the PEI/TA/TiO_(2)hydrogel formed on the skin could be easily removed using a NaHCO3 aqueous solution without inflicting damage.More importantly,the PEI/TA/TiO_(2)hydrogel can function as an effective sunscreen to block UV light and prevent UV-induced MMP-9 overexpression,inflammation,and DNA damage in animal skin.The advantages of PEI/TA/TiO_(2)coacervate-derived hydrogels include robust,asymmetric,and reversible wet bioadhesion,effective UV light-shielding ability,excellent biocompatibility,and easy preparation and usage,making them a promising bioadhesive to protect the skin from UV light-associated damage in wet and underwater environments.
