The leaching process of magnesiothermic self-propagating product generated during the multistage deep reduction process was investigated.The influence of magnesiothermic self-propagating product particle size,HCl solu...The leaching process of magnesiothermic self-propagating product generated during the multistage deep reduction process was investigated.The influence of magnesiothermic self-propagating product particle size,HCl solution concentration,and leaching solution temperature on the leaching behavior of elements Al and V was investigated.Results demonstrate that the leaching rate of Al and V is increased with the rise in leaching solution temperature,the increase in HCl solution concentration,and the enlargement of magnesiothermic self-propagating product particle size.The leaching processes of Al and V are consistent with the chemical reaction control model.When the magnesiothermic self-propagation product with D_(50) of 59.4μm is selected as the raw material,the leaching temperature is 40℃,and 1 mol/L HCl solution is employed,after leaching for 180 min,the leaching rates of Al and V are 24.8%and 12.6%,respectively.The acid-leached product exhibits a porous structure with a specific surface area of 3.5633 m^(2)/g.展开更多
Wrought and laser powder bed fusion(LPBF)Ti−6Al−4V(Ti-6-4)specimens were comparatively evaluated,with the objective to determine LPBF Ti−6Al−4V’s suitability for biomedical applications.Testing included nanoindentati...Wrought and laser powder bed fusion(LPBF)Ti−6Al−4V(Ti-6-4)specimens were comparatively evaluated,with the objective to determine LPBF Ti−6Al−4V’s suitability for biomedical applications.Testing included nanoindentation,cyclic polarization in simulated body fluid(SBF,37°C),and dry and SBF“ball-on-plate”sliding.Wrought Ti-6-4 exhibited a lamellarα+βmicrostructure,whereas LPBF Ti-6-4 displayed a fine-grainedα′-martensite microstructure.LPBF Ti-6-4 demonstrated~3%higher indentation modulus and~32%higher hardness,while wrought Ti-6-4 showed~8%higher plasticity.Both alloys exhibited low corrosion rates(10−5 mA/cm^(2)order)and true passivity(10−4 mA/cm^(2)order).No localized corrosion was observed in either two alloys,except for occasional metastable pitting in the LPBF alloy.However,LPBF Ti-6-4 presented higher corrosion rate and passive current,ascribed to its martensitic structure.During dry sliding,LPBF Ti-6-4 exhibited~14%lower volume loss compared to wrought Ti-6-4.Sliding in SBF increased volume losses for both alloys,with wear resistances nearly equalized,as the advantage of LPBF Ti-6-4 decreased due to more intense wear-accelerated corrosion induced by the stressed martensite.Overall,the results demonstrate the suitability of LPBF Ti-6-4 for biomedical uses.展开更多
A sustainable approach for recovering battery grade FePO_(4) and Li_(2)CO_(3) from Al/F-bearing spent LiFePO_(4)/C powder was proposed,including acid leaching,fluorinated coordination precipitation,homogeneous precipi...A sustainable approach for recovering battery grade FePO_(4) and Li_(2)CO_(3) from Al/F-bearing spent LiFePO_(4)/C powder was proposed,including acid leaching,fluorinated coordination precipitation,homogeneous precipitation,and high-temperature precipitation.Under the optimal conditions,the leaching efficiencies of Li,Fe,P,Al,and F were 97.6%,97.1%,97.1%,72.5%,and 63.3%,respectively.The effects of different parameters on the removal of Al/F impurities were systematically evaluated,indicating about 99.4%Al and 96.4%F in the leachate were precipitated in the form of Na_(3)Li_(3)Al_(2)F_(12),and their residual concentrations were only 0.0124 and 0.328 g/L,respectively,which could be directly used to prepare battery grade FePO_(4)(99.68%in purity).Lithium in the Al/F-bearing residue could be extracted through CaCO_(3)−CaSO_(4) roasting followed by acid leaching,ultimately obtaining 99.87%purity of Li_(2)CO_(3).The recovery rates of Li and Fe were 96.88%and 92.85%,respectively.An economic evaluation demonstrated that the process was profitable.展开更多
Aiming at improving the properties of magnesia carbon materials,silicon aluminum carbide(Al_(4)SiC_(4))containing materials were prepared using industrial aluminum powder,silicon carbide powder,and graphite as raw mat...Aiming at improving the properties of magnesia carbon materials,silicon aluminum carbide(Al_(4)SiC_(4))containing materials were prepared using industrial aluminum powder,silicon carbide powder,and graphite as raw materials,and activated alumina powder as an additive,mixing thoroughly,pressing into cylinders and then firing at 1200℃for 30 min in a carbon embedded atmosphere by the microwave method.The effects of the aluminum powder addition(20%and 24%,by mass)and activated alumina powder addition(0,3%,5%and 7%,by mass)on the microwave synthesis of Al_(4)SiC_(4) as well as the effect of the obtained Al_(4)SiC_(4) containing material on the properties of magnesia carbon bricks were studied.The results show that:compared with the samples with 20%aluminum powder,those with 24%aluminum powder generate more Al_(4)SiC_(4).With the activated alumina powder addition increasing from 0 to 7%,the amount of Al_(4)SiC_(4) generated increases first and then decreases.Compared with the sample without activated alumina powder,the samples with activated alumina powder show lower bulk density and higher apparent porosity.With the activated alumina powder addition increasing from 3%to 7%,the bulk density of the samples increases first and then decreases,while the apparent porosity of the samples shows an opposite trend.The optimal additions are 24%aluminum powder and 5%activated alumina powder,and Al_(4)SiC_(4) synthesized in this sample has a hexagonal plate structure.With the synthesized Al_(4)SiC_(4) containing material added,the magnesia carbon brick has slightly increased cold modulus of rupture,basically the same modulus of elasticity and improved oxidation resistance.展开更多
The electrochemical behavior of Ti-6Al-4V with 1 mm and 16 mm thickness prepared by electron beam powder bed fusion(EB-PBF)was investigated in phosphate buffered saline.Electrochemical results showed that EB-PBF Ti-6A...The electrochemical behavior of Ti-6Al-4V with 1 mm and 16 mm thickness prepared by electron beam powder bed fusion(EB-PBF)was investigated in phosphate buffered saline.Electrochemical results showed that EB-PBF Ti-6Al-4V with a larger component size was more resistant to corrosion compared to the smaller component,because of less acicularαʹphase content and moreβphase content.As a non-equilibrium phase in the“high-energy state”,αʹphase has a greater susceptibility to corrode and reduces the corrosion resistance of the material,whileβphase improves corrosion resistance of titanium alloys.The results show that the phase composition has a more significant effect on the corrosion performance than the grain size.展开更多
Objective:Long-term effects of chronic skin ulcers(CSU)include diminished physical and emotional well-being,an increased risk of cancer in more severe cases,and significant social costs due to inadequate treatment.Pin...Objective:Long-term effects of chronic skin ulcers(CSU)include diminished physical and emotional well-being,an increased risk of cancer in more severe cases,and significant social costs due to inadequate treatment.Pinian powder is a topical Chinese medicine created by the late renowned traditional Chinese medicine(TCM)master WEN Zhuozhi,with a long history of clinical use,and has been proven effective in treating various CSU.However,its exact mechanism of action is unknown.This study aims to investigate the effects and mechanisms of Pinian powder on chronic skin ulcers.Methods:A mouse model with skin defects and foreign body implantation was developed.Mice were divided into five groups:Control group,model control group,Pinian powder(PNP)group,inhibitor(MSAB)group,and PNP with inhibitor group.Treatments included saline washes,daily PNP application,intraperitoneal MSAB injection,and combined treatment.Wound healing was assessed on day 1,day 3,day 7,and day 14 using photography and software.Histological and Western blotting assays evaluated epidermal repair and protein expression related to wound healing.Immunofluorescence staining detected specific protein localization and expression.Statistical analysis was conducted using GraphPad Prism software,with significance set at P<0.05.Results:Clinical cases have demonstrated that Pinian powder can influence epidermal migration,reduce wound secretion,and stimulate granulation tissue formation in chronic skin ulcers.In vivo experiments,Pinian powder is applied externally to total skin defects and added to foreign body implantation in a mouse model of CSU.It activates the Wnt4/β-catenin signaling pathway,increases the expression of crucial proteins of fibroblast proliferation and keratinocyte proliferation,such asα-smooth muscle actin(α-SMA),Ki-67,K10,and K14,promotes wound healing.After the action ofβ-catenin inhibitor MSAB,the effect of Pinian powder was reversed.Conclusions:Pinian powder can promote the proliferation of keratinocytes and fibroblasts by activating the Wnt4/β-catenin signaling pathway and accelerating the wound healing of CSU.展开更多
Laser powder bed fusion(LPBF)technology offers a promising solution to the fabricability challenges of titanium alloys;however,it introduces defects such as porosity and cracking.Here,we evaluated the effectiveness of...Laser powder bed fusion(LPBF)technology offers a promising solution to the fabricability challenges of titanium alloys;however,it introduces defects such as porosity and cracking.Here,we evaluated the effectiveness of hot isostatic pressing(HIP)in eliminating defects and enhancing the overall properties of LPBF Ti-6Al-4V alloy.Our findings indicated that LPBF Ti-6Al-4V alloy after HIP established better corrosion resistance and ductility.These improvements could be related to the decomposition ofαʹphase and the elimination of internal defects within alloy matrix.Furthermore,the application prospect of LPBF Ti-6Al-4V alloy in spent fuel reprocessing environment was expounded.展开更多
In our current study,the impact of pre-creep treatment at 300℃ and 560 MPa for 1000 h on the subsequent creep behavior and properties at an elevated temperature of 400℃ have been examined.The characterization of the...In our current study,the impact of pre-creep treatment at 300℃ and 560 MPa for 1000 h on the subsequent creep behavior and properties at an elevated temperature of 400℃ have been examined.The characterization of the resulting creep deformation structure,including twins and dislocation morphology,was conducted using scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),and transmission electron microscopy(TEM).Additionally,we have focused on the fine crystallization behavior of theαphase during creep,as well as the study and discussion of the<α>dislocations and pyramidal<c+α>dislocations.Our findings indicate that the creep life at 400℃and 560 MPa is significantly lower,by an order of magnitude,compared to samples without pre-creep treatment.During the pre-creep process at 300℃,<α>dislocations were found to be active.Furthermore,the creep temperature was observed to reduce the critical resolved shear stress(CRSS)of pyramidal<c+α>dislocations,leading to increased dislocation activity at 400℃compared to 300℃.However,a substantial number of<α>dislocations activated during the pre-creep process were unable to accommodate the subsequent heating process,resulting in extensive intergranular fractures.Simultaneously,during the creep process,theαphase underwent marginal fine grain formation in the form of continuous dynamic recrystallization(CDRX),with its internal fine grain promoted by pyramidal<c+α>dislocations assisting<α>dislocation to form dislocation locks.These findings offer valuable insights into potential deformation mechanisms and failure causes of PM-HIP Ti-6Al-4 V alloy when subjected to elevated temperatures during creep.展开更多
Octahedral Fe_(3)O_(4)-modified coke Fenton catalyst(Fe_(3)O_(4)/PCWQ)was prepared via in-situ one-pot oxidation method inspired by grapefruit peel,and characterized by SEM,EDS,XRD,XPS,FTIR,BET,VSM,and Raman,respectiv...Octahedral Fe_(3)O_(4)-modified coke Fenton catalyst(Fe_(3)O_(4)/PCWQ)was prepared via in-situ one-pot oxidation method inspired by grapefruit peel,and characterized by SEM,EDS,XRD,XPS,FTIR,BET,VSM,and Raman,respectively.Fe_(3)O_(4)crystals was predominantly in octahedral morphology with an average particle size of 60 nm.Fe_(3)O_(4)/PCWQ exhibited graphene-like structure.The synergistic effect between oxygen functional group and Fe^(2+)/Fe^(3+)cycle in Fe_(3)O_(4)/PCWQ enhances the degradation performance of p-nitrophenol(P-NP).Under the optimal conditions(1.0 g/L catalyst,30 mmol/L H_(2)O_(2),pH 3.0,25℃),Fe_(3)O_(4)/PCWQ exhibits high degradation efficiency of P-NP(91.25%in 30 min and 98.21%in 180 min)and stability(90.72%after 6 cycles)with low iron leaching(<0.528 mg/L),following the quasi-first-order degradation kinetics.Fe_(3)O_(4)/PCWQ has better catalytic performance than pure Fe_(3)O_(4)under the action of H_(2)O_(2),and is an efficient,stable and repeatable green catalyst.展开更多
基金Scientific and Technological Project of Nanyang(23KJGG017)Key Specialized Research&Development and Promotion Project(Scientific and Technological Project)of Henan Province(232102221022)+1 种基金College Students and Technology Innovation Fund Project of Nanyang Institute of Technology(2023139)Project of Doctoral Scientific Research Startup Fund of Nanyang Institute of Technology(NGBJ-2023-25)。
文摘The leaching process of magnesiothermic self-propagating product generated during the multistage deep reduction process was investigated.The influence of magnesiothermic self-propagating product particle size,HCl solution concentration,and leaching solution temperature on the leaching behavior of elements Al and V was investigated.Results demonstrate that the leaching rate of Al and V is increased with the rise in leaching solution temperature,the increase in HCl solution concentration,and the enlargement of magnesiothermic self-propagating product particle size.The leaching processes of Al and V are consistent with the chemical reaction control model.When the magnesiothermic self-propagation product with D_(50) of 59.4μm is selected as the raw material,the leaching temperature is 40℃,and 1 mol/L HCl solution is employed,after leaching for 180 min,the leaching rates of Al and V are 24.8%and 12.6%,respectively.The acid-leached product exhibits a porous structure with a specific surface area of 3.5633 m^(2)/g.
基金supported by the Ministry of Education and Science of Ukraine(No.0123U101834)support in the framework of the“EU Next generation EU through the Recovery and Resilience Plan for Slovakia”(Nos.09I03-03-V01-00061 and 09I03-03-V01-00099)。
文摘Wrought and laser powder bed fusion(LPBF)Ti−6Al−4V(Ti-6-4)specimens were comparatively evaluated,with the objective to determine LPBF Ti−6Al−4V’s suitability for biomedical applications.Testing included nanoindentation,cyclic polarization in simulated body fluid(SBF,37°C),and dry and SBF“ball-on-plate”sliding.Wrought Ti-6-4 exhibited a lamellarα+βmicrostructure,whereas LPBF Ti-6-4 displayed a fine-grainedα′-martensite microstructure.LPBF Ti-6-4 demonstrated~3%higher indentation modulus and~32%higher hardness,while wrought Ti-6-4 showed~8%higher plasticity.Both alloys exhibited low corrosion rates(10−5 mA/cm^(2)order)and true passivity(10−4 mA/cm^(2)order).No localized corrosion was observed in either two alloys,except for occasional metastable pitting in the LPBF alloy.However,LPBF Ti-6-4 presented higher corrosion rate and passive current,ascribed to its martensitic structure.During dry sliding,LPBF Ti-6-4 exhibited~14%lower volume loss compared to wrought Ti-6-4.Sliding in SBF increased volume losses for both alloys,with wear resistances nearly equalized,as the advantage of LPBF Ti-6-4 decreased due to more intense wear-accelerated corrosion induced by the stressed martensite.Overall,the results demonstrate the suitability of LPBF Ti-6-4 for biomedical uses.
基金financially supported by the Key Research and Development Program of Guangxi,China(No.GUIKE AB23026051)the Science and Technology Innovation Program of Hunan Province,China(No.2023RC3039)the Fundamental Research Funds for the Central Universities of Central South University,China.
文摘A sustainable approach for recovering battery grade FePO_(4) and Li_(2)CO_(3) from Al/F-bearing spent LiFePO_(4)/C powder was proposed,including acid leaching,fluorinated coordination precipitation,homogeneous precipitation,and high-temperature precipitation.Under the optimal conditions,the leaching efficiencies of Li,Fe,P,Al,and F were 97.6%,97.1%,97.1%,72.5%,and 63.3%,respectively.The effects of different parameters on the removal of Al/F impurities were systematically evaluated,indicating about 99.4%Al and 96.4%F in the leachate were precipitated in the form of Na_(3)Li_(3)Al_(2)F_(12),and their residual concentrations were only 0.0124 and 0.328 g/L,respectively,which could be directly used to prepare battery grade FePO_(4)(99.68%in purity).Lithium in the Al/F-bearing residue could be extracted through CaCO_(3)−CaSO_(4) roasting followed by acid leaching,ultimately obtaining 99.87%purity of Li_(2)CO_(3).The recovery rates of Li and Fe were 96.88%and 92.85%,respectively.An economic evaluation demonstrated that the process was profitable.
基金This work was funded by Luoyang Major Science and Technology Innovation Project(2301009A)Henan Province Key ResearchandDevelopment Project(231111230200).
文摘Aiming at improving the properties of magnesia carbon materials,silicon aluminum carbide(Al_(4)SiC_(4))containing materials were prepared using industrial aluminum powder,silicon carbide powder,and graphite as raw materials,and activated alumina powder as an additive,mixing thoroughly,pressing into cylinders and then firing at 1200℃for 30 min in a carbon embedded atmosphere by the microwave method.The effects of the aluminum powder addition(20%and 24%,by mass)and activated alumina powder addition(0,3%,5%and 7%,by mass)on the microwave synthesis of Al_(4)SiC_(4) as well as the effect of the obtained Al_(4)SiC_(4) containing material on the properties of magnesia carbon bricks were studied.The results show that:compared with the samples with 20%aluminum powder,those with 24%aluminum powder generate more Al_(4)SiC_(4).With the activated alumina powder addition increasing from 0 to 7%,the amount of Al_(4)SiC_(4) generated increases first and then decreases.Compared with the sample without activated alumina powder,the samples with activated alumina powder show lower bulk density and higher apparent porosity.With the activated alumina powder addition increasing from 3%to 7%,the bulk density of the samples increases first and then decreases,while the apparent porosity of the samples shows an opposite trend.The optimal additions are 24%aluminum powder and 5%activated alumina powder,and Al_(4)SiC_(4) synthesized in this sample has a hexagonal plate structure.With the synthesized Al_(4)SiC_(4) containing material added,the magnesia carbon brick has slightly increased cold modulus of rupture,basically the same modulus of elasticity and improved oxidation resistance.
基金This work was supported partially by the National Natural Science Foundation of China(U2241245)the CAS Interdisciplinary Innovation Team Project(JCTD-2020-10)of China+2 种基金the State Key Laboratory of Light Alloy Casting Technology for High-End Equipment(LACT-007)the Opening project of National Key Laboratory of Shock Wave and Detonation Physics(2022JCJQLB05702)the Original Fund of Nuclear Power Institute of China(kJCX-2022-YC2-20).
文摘The electrochemical behavior of Ti-6Al-4V with 1 mm and 16 mm thickness prepared by electron beam powder bed fusion(EB-PBF)was investigated in phosphate buffered saline.Electrochemical results showed that EB-PBF Ti-6Al-4V with a larger component size was more resistant to corrosion compared to the smaller component,because of less acicularαʹphase content and moreβphase content.As a non-equilibrium phase in the“high-energy state”,αʹphase has a greater susceptibility to corrode and reduces the corrosion resistance of the material,whileβphase improves corrosion resistance of titanium alloys.The results show that the phase composition has a more significant effect on the corrosion performance than the grain size.
基金supported by the National Natural Science Foundation of China(No.82004380).
文摘Objective:Long-term effects of chronic skin ulcers(CSU)include diminished physical and emotional well-being,an increased risk of cancer in more severe cases,and significant social costs due to inadequate treatment.Pinian powder is a topical Chinese medicine created by the late renowned traditional Chinese medicine(TCM)master WEN Zhuozhi,with a long history of clinical use,and has been proven effective in treating various CSU.However,its exact mechanism of action is unknown.This study aims to investigate the effects and mechanisms of Pinian powder on chronic skin ulcers.Methods:A mouse model with skin defects and foreign body implantation was developed.Mice were divided into five groups:Control group,model control group,Pinian powder(PNP)group,inhibitor(MSAB)group,and PNP with inhibitor group.Treatments included saline washes,daily PNP application,intraperitoneal MSAB injection,and combined treatment.Wound healing was assessed on day 1,day 3,day 7,and day 14 using photography and software.Histological and Western blotting assays evaluated epidermal repair and protein expression related to wound healing.Immunofluorescence staining detected specific protein localization and expression.Statistical analysis was conducted using GraphPad Prism software,with significance set at P<0.05.Results:Clinical cases have demonstrated that Pinian powder can influence epidermal migration,reduce wound secretion,and stimulate granulation tissue formation in chronic skin ulcers.In vivo experiments,Pinian powder is applied externally to total skin defects and added to foreign body implantation in a mouse model of CSU.It activates the Wnt4/β-catenin signaling pathway,increases the expression of crucial proteins of fibroblast proliferation and keratinocyte proliferation,such asα-smooth muscle actin(α-SMA),Ki-67,K10,and K14,promotes wound healing.After the action ofβ-catenin inhibitor MSAB,the effect of Pinian powder was reversed.Conclusions:Pinian powder can promote the proliferation of keratinocytes and fibroblasts by activating the Wnt4/β-catenin signaling pathway and accelerating the wound healing of CSU.
基金supported by the National Natural Science Foundation of China(Nos.52101105,52373321)the IMR Innovation Fund(2023-PY03)the LingChuang Research Project of China National Nuclear Corporation(CNNC-LCKY-202274).
文摘Laser powder bed fusion(LPBF)technology offers a promising solution to the fabricability challenges of titanium alloys;however,it introduces defects such as porosity and cracking.Here,we evaluated the effectiveness of hot isostatic pressing(HIP)in eliminating defects and enhancing the overall properties of LPBF Ti-6Al-4V alloy.Our findings indicated that LPBF Ti-6Al-4V alloy after HIP established better corrosion resistance and ductility.These improvements could be related to the decomposition ofαʹphase and the elimination of internal defects within alloy matrix.Furthermore,the application prospect of LPBF Ti-6Al-4V alloy in spent fuel reprocessing environment was expounded.
基金supported by the National Key R&D Program of China(No.2023YFB3710700)the National Natural Science Foundation of China(No.52074229)the Major Scientific Research Projects in Panxi Experimental Area,and the Key R&D Plan of Sichuan Province(Nos.SC2022A1C01J and 23ZDZX0031).
文摘In our current study,the impact of pre-creep treatment at 300℃ and 560 MPa for 1000 h on the subsequent creep behavior and properties at an elevated temperature of 400℃ have been examined.The characterization of the resulting creep deformation structure,including twins and dislocation morphology,was conducted using scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),and transmission electron microscopy(TEM).Additionally,we have focused on the fine crystallization behavior of theαphase during creep,as well as the study and discussion of the<α>dislocations and pyramidal<c+α>dislocations.Our findings indicate that the creep life at 400℃and 560 MPa is significantly lower,by an order of magnitude,compared to samples without pre-creep treatment.During the pre-creep process at 300℃,<α>dislocations were found to be active.Furthermore,the creep temperature was observed to reduce the critical resolved shear stress(CRSS)of pyramidal<c+α>dislocations,leading to increased dislocation activity at 400℃compared to 300℃.However,a substantial number of<α>dislocations activated during the pre-creep process were unable to accommodate the subsequent heating process,resulting in extensive intergranular fractures.Simultaneously,during the creep process,theαphase underwent marginal fine grain formation in the form of continuous dynamic recrystallization(CDRX),with its internal fine grain promoted by pyramidal<c+α>dislocations assisting<α>dislocation to form dislocation locks.These findings offer valuable insights into potential deformation mechanisms and failure causes of PM-HIP Ti-6Al-4 V alloy when subjected to elevated temperatures during creep.
基金Funded by the Nation Natural Science Foundation of China(No.52304410)the Science Fund for Creative Research Groups of the National Natural Science Foundation of Hubei Province(No.2020CFA038)+2 种基金the Major Project of Hubei Province(Functional coating and materials,No.2023BAA003)the State Key Laboratory of Coking Coal Resources Green Exploitation(No.41040220201308)the Research Project of Yingcheng Xinjincheng Environmental Protection Technology Co.,Ltd(No.2023420612000754)。
文摘Octahedral Fe_(3)O_(4)-modified coke Fenton catalyst(Fe_(3)O_(4)/PCWQ)was prepared via in-situ one-pot oxidation method inspired by grapefruit peel,and characterized by SEM,EDS,XRD,XPS,FTIR,BET,VSM,and Raman,respectively.Fe_(3)O_(4)crystals was predominantly in octahedral morphology with an average particle size of 60 nm.Fe_(3)O_(4)/PCWQ exhibited graphene-like structure.The synergistic effect between oxygen functional group and Fe^(2+)/Fe^(3+)cycle in Fe_(3)O_(4)/PCWQ enhances the degradation performance of p-nitrophenol(P-NP).Under the optimal conditions(1.0 g/L catalyst,30 mmol/L H_(2)O_(2),pH 3.0,25℃),Fe_(3)O_(4)/PCWQ exhibits high degradation efficiency of P-NP(91.25%in 30 min and 98.21%in 180 min)and stability(90.72%after 6 cycles)with low iron leaching(<0.528 mg/L),following the quasi-first-order degradation kinetics.Fe_(3)O_(4)/PCWQ has better catalytic performance than pure Fe_(3)O_(4)under the action of H_(2)O_(2),and is an efficient,stable and repeatable green catalyst.
