With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcomin...With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcoming this issue requires developing highly efficient materials for capturing U(Ⅵ)from nuclear wastewater.Herein,magnetic porous microcubes with a graphitic shell and highly dispersed active cores(Fe/Fe_(3)C nanoparticles)are rationally designed and fabricated by simply annealing preformed polydopamine(PDA)coated Prussian blue(PB)microcubes.To assess the sorption properties,sequestration of U(Ⅵ)on N-doped metal/metal carbide nanoparticles encapsulated in a carbon matrix(N-doped Fe/Fe_(3)C@C)was systematically investigated using batch experiments.The sorption performance revealed that the N-doped Fe/Fe_(3)C@C samples exhibited highly efficient removal efficiency for U(Ⅵ),and the sample prepared at 800℃(N-doped Fe/Fe_(3)C@C-800)was the best among the series with a maximum sorption capacity of 203 mg g^(-1).The U(Ⅵ)adsorption and reduction by N-doped Fe/Fe_(3)C@C-800 were affected significantly by solution pH and concentrations of bicarbonate and calcium.The main reaction mechanism involved U(Ⅵ)reduction into insoluble U(Ⅳ)species by Fe^(0)/Fe(Ⅱ)and trapping the vip U(Ⅳ)in the porous carbon matrix,which synergistically promoted U(Ⅵ)removal from solution to N-doped Fe/Fe_(3)C@C-800.This study demonstrated the simple synthesis of magnetic N-doped Fe/Fe_(3)C@C derived from metal-organic frameworks and their potential application in U(Ⅵ)-contaminated wastewater remediation.展开更多
基金financial support of NSFC(91326202,21225730,21577032)the Priority Academic Program Development of Jiangsu Higher Education Institutions+1 种基金the Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsFundamental Research Funds for the Central Universities(JB2015001).
文摘With the growing development of the nuclear industry and the peaceful utilization of nuclear energy,the safe treatment and disposal of high-level wastes in nuclear waste management is still a major challenge.Overcoming this issue requires developing highly efficient materials for capturing U(Ⅵ)from nuclear wastewater.Herein,magnetic porous microcubes with a graphitic shell and highly dispersed active cores(Fe/Fe_(3)C nanoparticles)are rationally designed and fabricated by simply annealing preformed polydopamine(PDA)coated Prussian blue(PB)microcubes.To assess the sorption properties,sequestration of U(Ⅵ)on N-doped metal/metal carbide nanoparticles encapsulated in a carbon matrix(N-doped Fe/Fe_(3)C@C)was systematically investigated using batch experiments.The sorption performance revealed that the N-doped Fe/Fe_(3)C@C samples exhibited highly efficient removal efficiency for U(Ⅵ),and the sample prepared at 800℃(N-doped Fe/Fe_(3)C@C-800)was the best among the series with a maximum sorption capacity of 203 mg g^(-1).The U(Ⅵ)adsorption and reduction by N-doped Fe/Fe_(3)C@C-800 were affected significantly by solution pH and concentrations of bicarbonate and calcium.The main reaction mechanism involved U(Ⅵ)reduction into insoluble U(Ⅳ)species by Fe^(0)/Fe(Ⅱ)and trapping the vip U(Ⅳ)in the porous carbon matrix,which synergistically promoted U(Ⅵ)removal from solution to N-doped Fe/Fe_(3)C@C-800.This study demonstrated the simple synthesis of magnetic N-doped Fe/Fe_(3)C@C derived from metal-organic frameworks and their potential application in U(Ⅵ)-contaminated wastewater remediation.
