A three-dimensional(3D) lanthanide metal-organic coordination polymer with a three-dimensional open framework,Tm(BTC)(DMF)(DMSO),was synthesized by reaction of the lanthanide ions(Tm3+) with 1, 3,5-benzenetricarboxyli...A three-dimensional(3D) lanthanide metal-organic coordination polymer with a three-dimensional open framework,Tm(BTC)(DMF)(DMSO),was synthesized by reaction of the lanthanide ions(Tm3+) with 1, 3,5-benzenetricarboxylic acid(H3BTC) in a mixed solution of DMF(N,N′dimethylformamide) and DMSO(dimethyl sulphoxide).This compound crystallizes in a monoclinic space group P21/n with unit cell parameters a=1.0801(2) nm,b=1.5550(3) nm,c=1.0906(2) nm,β=100.401°,V=1.8017(6) nm3 and Z=4.The compound exhibits one-dimensional channels along the direction and could uptake carbon dioxide at 1×105 Pa.展开更多
The molecular constants of selected diatomic lanthanide compounds (LaH, LaO, LaF, EuH, EuO, EuF, EuS, GdO, GdF, GdH, YbH, YbO, YbF, YbS, LuH, LuO and LuF) have been calculated by using relativistic small-core pseudopo...The molecular constants of selected diatomic lanthanide compounds (LaH, LaO, LaF, EuH, EuO, EuF, EuS, GdO, GdF, GdH, YbH, YbO, YbF, YbS, LuH, LuO and LuF) have been calculated by using relativistic small-core pseudopotentials and optimized (14s13p10d8f6g)/ [6s6p5d4f3g] valence basis sets. The results are in good agreement with available experimental data, with exception of YbO and LuF. The reasons for the discrepancies in case of YbO are due to a complicated mixing of configurations in the ground state, whereas in case of LuF the binding energy estimated by experimentalists appears to be too low.展开更多
The aim of the present investigation was to study the potential of two brown seaweeds（Sargassum wightii and Turbinaria conoides） to remove praseodymium ions from solutions. Due to swelling problems, the seaweed biom...The aim of the present investigation was to study the potential of two brown seaweeds（Sargassum wightii and Turbinaria conoides） to remove praseodymium ions from solutions. Due to swelling problems, the seaweed biomasses were also immobilized using polysulfone matrices which amplified hydraulic conductivity more than 7.1 times. At optimum pH of 5, maximum Pr（III） uptakes of 131.4, 146.4, 111.2 and 119.5 mg/g were observed for free-S. wightii, free-T. conoides, polysulfone immobilized S. wightii（PISW） and polysulfone immobilized T. conoides（PITC）, respectively. Experimental biosorption isotherms were successfully described using the Langmuir, Freundlich and Sips model. Owing to intraparticle diffusion, rate of Pr（III） sorption by immobilized biosorbents was slow and equilibrium attainment took 240 min compared to only 90 min by free biomasses. However, regeneration of seaweed biomasses for repeated sorption application was only possible with immobilization biosorbents. With 0.1 mol/L HCl as elutant, both PITC and PISW exhibited invariable Pr（III） uptake capacity and very high mechanical stability over 10 sorption-desorption cycles.展开更多
The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantl...The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantly suppress the activity of cellulose. The responses of three enzymes in earthworm to Lan were different, Lan mostly affects catalase activity and inhibited catalase activity throughout the experiment. Peroxidase activity tend to 'promote weakly and inhibited strongly' when short term of exposure to Lan, while 'inhibited weakly and promote strongly' as a function of time. In comparison, Lan had little influence on the activity of superoxide dismutase. The variance analysis results showed that the concentration of Lan significantly affected the activities of cellulose and CAT but had no obvious influence on the activities of SOD and POD. The treatment time and the interactive effect between treatment concentrations and time had very significant effect on the activities of cellulose, SOD, CAT and POD.展开更多
文摘A three-dimensional(3D) lanthanide metal-organic coordination polymer with a three-dimensional open framework,Tm(BTC)(DMF)(DMSO),was synthesized by reaction of the lanthanide ions(Tm3+) with 1, 3,5-benzenetricarboxylic acid(H3BTC) in a mixed solution of DMF(N,N′dimethylformamide) and DMSO(dimethyl sulphoxide).This compound crystallizes in a monoclinic space group P21/n with unit cell parameters a=1.0801(2) nm,b=1.5550(3) nm,c=1.0906(2) nm,β=100.401°,V=1.8017(6) nm3 and Z=4.The compound exhibits one-dimensional channels along the direction and could uptake carbon dioxide at 1×105 Pa.
文摘The molecular constants of selected diatomic lanthanide compounds (LaH, LaO, LaF, EuH, EuO, EuF, EuS, GdO, GdF, GdH, YbH, YbO, YbF, YbS, LuH, LuO and LuF) have been calculated by using relativistic small-core pseudopotentials and optimized (14s13p10d8f6g)/ [6s6p5d4f3g] valence basis sets. The results are in good agreement with available experimental data, with exception of YbO and LuF. The reasons for the discrepancies in case of YbO are due to a complicated mixing of configurations in the ground state, whereas in case of LuF the binding energy estimated by experimentalists appears to be too low.
基金supported by Ramalingaswami Re-entry Fellowship from Department of Biotechnology,Ministry of India,India
文摘The aim of the present investigation was to study the potential of two brown seaweeds（Sargassum wightii and Turbinaria conoides） to remove praseodymium ions from solutions. Due to swelling problems, the seaweed biomasses were also immobilized using polysulfone matrices which amplified hydraulic conductivity more than 7.1 times. At optimum pH of 5, maximum Pr（III） uptakes of 131.4, 146.4, 111.2 and 119.5 mg/g were observed for free-S. wightii, free-T. conoides, polysulfone immobilized S. wightii（PISW） and polysulfone immobilized T. conoides（PITC）, respectively. Experimental biosorption isotherms were successfully described using the Langmuir, Freundlich and Sips model. Owing to intraparticle diffusion, rate of Pr（III） sorption by immobilized biosorbents was slow and equilibrium attainment took 240 min compared to only 90 min by free biomasses. However, regeneration of seaweed biomasses for repeated sorption application was only possible with immobilization biosorbents. With 0.1 mol/L HCl as elutant, both PITC and PISW exhibited invariable Pr（III） uptake capacity and very high mechanical stability over 10 sorption-desorption cycles.
基金Project supported bythe National Natural Science Foundation of China (2002CB410800)
文摘The effects of Rare Earth Element Lan on the activities of cellulose, catalase, peroxidase and superoxide dismutasein in earthworm were carried out by natural soil test. The results indicated that Lan can significantly suppress the activity of cellulose. The responses of three enzymes in earthworm to Lan were different, Lan mostly affects catalase activity and inhibited catalase activity throughout the experiment. Peroxidase activity tend to 'promote weakly and inhibited strongly' when short term of exposure to Lan, while 'inhibited weakly and promote strongly' as a function of time. In comparison, Lan had little influence on the activity of superoxide dismutase. The variance analysis results showed that the concentration of Lan significantly affected the activities of cellulose and CAT but had no obvious influence on the activities of SOD and POD. The treatment time and the interactive effect between treatment concentrations and time had very significant effect on the activities of cellulose, SOD, CAT and POD.
