The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-...The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-SO_(3)H,was prepared based on the oxidation of-SH group.Characterizations confirm the successful introduction of-SO_(3)H,good porosity,and stability of the material.The adsorbent exhibits excellent capture ability for Ba^(2+)due to strong hard acid-base and electrostatic interactions,with the adsorption capacity of 152.0 mg g^(-1)and fast equilibrium adsorption time,superior to other reported materials.Optimal pH was found to be almost neutral and temperature cannot affect the adsorption largely.Besides,the irreversible adsorption was demonstrated and thereby the secondary pollution may be avoided.Therefore,our work provides an efficient adsorbent for capturing Ba^(2+)irreversibly,and proposes a feasible strategy for constructing adsorbents with simultaneous high adsorption capacity and fast kinetics.展开更多
In crystals BaFX:Eu^(2+)(X=Cl,Br).there exists configuration interaction between 4f^65d and 4f^65s ex- cited state of Eu^(2+)ion.and it results in the change of relative intensities of d-f and f-f transition.The trans...In crystals BaFX:Eu^(2+)(X=Cl,Br).there exists configuration interaction between 4f^65d and 4f^65s ex- cited state of Eu^(2+)ion.and it results in the change of relative intensities of d-f and f-f transition.The transition ~S_-_2→4f^65d-6s is observed.The variation of F/X atomic ratio between 110/90 and 90/110 does not obvi- ously influence the luminescence of BaFX:Eu^(2-).There is energy transfer between Eu^(2+)(f-f)and Eu^(3+)which coexists in the matrices.展开更多
The positive temperature coefficient resistance ( PTCR) barium titanate ceramic samples have been prepared by the standard solid-state reaction method, and the ceramic samples have been treated by depositing copper fi...The positive temperature coefficient resistance ( PTCR) barium titanate ceramic samples have been prepared by the standard solid-state reaction method, and the ceramic samples have been treated by depositing copper films with magnetron sputtering method. The metallic copper films deposited on the ceramic substrates have been mixed at room temperature with argon ions in energy of 400 keV. Ion beam mixing induced modification of PTCR behavior of the ceramics was studied by using the ac complex impedance method and the resistance vs. temperature measurements . The results showed that room temperature resistance dramatically decreased and Curie point shifted toward higher temperature side for the ion beam mixed samples.展开更多
大量钡渣堆积会对环境造成极大的危害。对钡渣采用盐酸浸出,能有效回收钡渣中剩余可溶性钡盐,还能大大减少钡渣对环境的危害,是一种较好的利用钡渣的方法。本文通过实验,得出了较好的钡渣盐酸浸出条件,在钡渣磨矿细度为-0.074 mm 80%,...大量钡渣堆积会对环境造成极大的危害。对钡渣采用盐酸浸出,能有效回收钡渣中剩余可溶性钡盐,还能大大减少钡渣对环境的危害,是一种较好的利用钡渣的方法。本文通过实验,得出了较好的钡渣盐酸浸出条件,在钡渣磨矿细度为-0.074 mm 80%,盐酸浓度为3 mol/L,浸出固液比为1∶7,浸出时间为2 h,浸出温度为40℃,浸出搅拌速度480 r/min时,得到了较佳的钡离子浸出率,钡离子总浸出率达到了38.88%,仅考虑可溶性钡盐时,钡离子浸出率达到90.30%。展开更多
基金support by the National Natural Science Foundation of China(Nos.52071227,21978212,and 21706106)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2019L0657)State Key Laboratory of Separation Membranes and Membrane Processes(Tiangong University),China(No.M202102).
文摘The simultaneous high-capacity and fast removal of radioactive barium ion(Ba^(2+))from nuclear wastewater is necessary but still faces large challenge.In this study,a novel adsorbent containing sulfonic group,MOF-808-SO_(3)H,was prepared based on the oxidation of-SH group.Characterizations confirm the successful introduction of-SO_(3)H,good porosity,and stability of the material.The adsorbent exhibits excellent capture ability for Ba^(2+)due to strong hard acid-base and electrostatic interactions,with the adsorption capacity of 152.0 mg g^(-1)and fast equilibrium adsorption time,superior to other reported materials.Optimal pH was found to be almost neutral and temperature cannot affect the adsorption largely.Besides,the irreversible adsorption was demonstrated and thereby the secondary pollution may be avoided.Therefore,our work provides an efficient adsorbent for capturing Ba^(2+)irreversibly,and proposes a feasible strategy for constructing adsorbents with simultaneous high adsorption capacity and fast kinetics.
基金Project supported by the National Natural Science Foundation of China
文摘In crystals BaFX:Eu^(2+)(X=Cl,Br).there exists configuration interaction between 4f^65d and 4f^65s ex- cited state of Eu^(2+)ion.and it results in the change of relative intensities of d-f and f-f transition.The transition ~S_-_2→4f^65d-6s is observed.The variation of F/X atomic ratio between 110/90 and 90/110 does not obvi- ously influence the luminescence of BaFX:Eu^(2-).There is energy transfer between Eu^(2+)(f-f)and Eu^(3+)which coexists in the matrices.
文摘The positive temperature coefficient resistance ( PTCR) barium titanate ceramic samples have been prepared by the standard solid-state reaction method, and the ceramic samples have been treated by depositing copper films with magnetron sputtering method. The metallic copper films deposited on the ceramic substrates have been mixed at room temperature with argon ions in energy of 400 keV. Ion beam mixing induced modification of PTCR behavior of the ceramics was studied by using the ac complex impedance method and the resistance vs. temperature measurements . The results showed that room temperature resistance dramatically decreased and Curie point shifted toward higher temperature side for the ion beam mixed samples.
基金Doctoral Scientific Research Foundation of Shanxi Datong University(2014-B-11)National Natural Science Foundation of China(21174114)+3 种基金National Natural Science Foundation of China(21363021)Program for Changjiang Scholars and Innovative Research Team in University of M inistry of Education of China(IRT1177)Scientific and Technical plan project of Gansu province(1204GKCA006)Scientific and Technical Innovation Project of Northw est Normal University(nw nu-kjcxgc-03-63)~~
