Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face water.It becomes a great threat to the ecological environment.Here,a device of photocatalysis as-sisted microbial...Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face water.It becomes a great threat to the ecological environment.Here,a device of photocatalysis as-sisted microbial fuel cell(photo-MFC)was constructed for TC degradation and energy recovery.In this photo-MFC,cadmium sulfide(CdS)cage photocatalysis can degrade most of TC in a short time.While the Co_(3)O_(4)@C-CC(carbonization and calcination of the ZIF-67 precursor in-situ grown on the carbon cloth(CC))bioanode degrades the rest of TC as well as the photocatalytic products,thus improving the miner-alization.The co-existence of photocatalysis with bioanode changes the microbial community structure of the biofilms.The dominant phylum is Geobacter(60.2%)in normal MFC while that in photo-MFC are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(COD)removal of 98.6%,which is higher than that of normal MFC(77.6%)or single CdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of MFC,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) TC exhibits no visible biotoxity.Furthermore,electrochemical test,finite-difference time-domain(FDTD),density functional theory(DFT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this photo-MFC.This strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.展开更多
The Ti-6Al-4V alloy is the most widely utilized titanium metal alloy globally,making the enhancement of its mechanical properties important.In this study,we achieved an ultimate tensile strength of 1.5 GPa through the...The Ti-6Al-4V alloy is the most widely utilized titanium metal alloy globally,making the enhancement of its mechanical properties important.In this study,we achieved an ultimate tensile strength of 1.5 GPa through the additive manufacturing(AM)of Ti-6Al-4V.Specifically,the Ti-6Al-4V alloy was fabricated via laser powder bed fusion(L-PBF)using Ti-6Al-4V powder subjected to cold plastic deformation(CPD Ti-6Al-4V).The microstructural evolution of the Ti-6Al-4V powder during CPD was analyzed in detail.The CPD Ti-6Al-4V powder exhibited a core-shell structure with subgrains and nanocrystals formed via high-density dislocations within the shell.In addition,the as-printed CPD Ti-6Al-4V alloy had an average grain size of approximately 1.9µm.The presence of interstitial elements and finer grains resulted in the formation of Ti-6Al-4V alloys with ultrahigh strengths(ultimate tensile strength of approximately 1500 MPa,yield strength of 1320 MPa,and elongation of 6%).This groundbreaking achievement paves the way for further advancements in AM technology and presents exciting opportunities for innovation across a range of high-strength materials,which are crucial for achieving optimal performance.展开更多
基金This work was supported by Natural Science Foundation of Hei-longjiang Province(No.LH2022E050)Interdisciplinary Research Foundation of HIT(No.IR2021215)the National Natural Sci-ence Foundation of China(No.52172278).
文摘Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face water.It becomes a great threat to the ecological environment.Here,a device of photocatalysis as-sisted microbial fuel cell(photo-MFC)was constructed for TC degradation and energy recovery.In this photo-MFC,cadmium sulfide(CdS)cage photocatalysis can degrade most of TC in a short time.While the Co_(3)O_(4)@C-CC(carbonization and calcination of the ZIF-67 precursor in-situ grown on the carbon cloth(CC))bioanode degrades the rest of TC as well as the photocatalytic products,thus improving the miner-alization.The co-existence of photocatalysis with bioanode changes the microbial community structure of the biofilms.The dominant phylum is Geobacter(60.2%)in normal MFC while that in photo-MFC are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(COD)removal of 98.6%,which is higher than that of normal MFC(77.6%)or single CdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of MFC,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) TC exhibits no visible biotoxity.Furthermore,electrochemical test,finite-difference time-domain(FDTD),density functional theory(DFT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this photo-MFC.This strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(No.2020B1515120013)the National Natural Science Foundation of China(Nos.51971108 and 52271032)+1 种基金the Key Research and Development Program of Jiangsu Province(No.K22251901)the Shenzhen Science and Technology Innovation Commission(Nos.JCYJ20220818100612027 and JSGG20210420091802007).
文摘The Ti-6Al-4V alloy is the most widely utilized titanium metal alloy globally,making the enhancement of its mechanical properties important.In this study,we achieved an ultimate tensile strength of 1.5 GPa through the additive manufacturing(AM)of Ti-6Al-4V.Specifically,the Ti-6Al-4V alloy was fabricated via laser powder bed fusion(L-PBF)using Ti-6Al-4V powder subjected to cold plastic deformation(CPD Ti-6Al-4V).The microstructural evolution of the Ti-6Al-4V powder during CPD was analyzed in detail.The CPD Ti-6Al-4V powder exhibited a core-shell structure with subgrains and nanocrystals formed via high-density dislocations within the shell.In addition,the as-printed CPD Ti-6Al-4V alloy had an average grain size of approximately 1.9µm.The presence of interstitial elements and finer grains resulted in the formation of Ti-6Al-4V alloys with ultrahigh strengths(ultimate tensile strength of approximately 1500 MPa,yield strength of 1320 MPa,and elongation of 6%).This groundbreaking achievement paves the way for further advancements in AM technology and presents exciting opportunities for innovation across a range of high-strength materials,which are crucial for achieving optimal performance.
