A new nanometer material,nanometer AlO(OH)loaded on the fiberglass with activated carbon fibersfelt(ACF)as the carrier,was prepared by hydrolytic reaction for the removal of Cd(II)from aqueous solution usingcolumn ads...A new nanometer material,nanometer AlO(OH)loaded on the fiberglass with activated carbon fibersfelt(ACF)as the carrier,was prepared by hydrolytic reaction for the removal of Cd(II)from aqueous solution usingcolumn adsorption experiment.As was confirmed by XRD determination,the hydrolysis production loaded on fi-berglass was similar to the orthorhombic phase AlO(OH).SEM images showed that AlO(OH)particles were in theform of small aggregated clusters.The Thomas model was applied for estimating the kinetic parameters and thesaturated adsorption ability of Cd(II)adsorption on the new adsorbent.The results showed that the maximum ad-sorption capacity of Cd(II)was 128.50 mg·g-1and 117.86 mg·g-1for the adsorbent mass of 0.3289 g and the ad-sorbent mass of 0.2867 g,respectively.The elution experiment result indicated that the adsorbed Cd ions was easilydesorbed from the material with 0.1 mol·L-1HCl solution.Adsorption-desorption cycles showed the feasibility ofrepeated uses of the composited material.The adsorption capacities were influenced by pH and the initial Cd(II)concentration.The amount adsorbed was greatest at pH 6.5 and the initial Cd(II)concentration of 0.07 mg·L-1,re-spectively.Nanometer AlO(OH)played a major role in the adsorption process,whereas the fiberglass and ACFwere assistants in the process of removing Cd(II).In addition,the adsorption capacities for Cd(II)were obviouslyreduced from 128.50 mg·g-1to 64.28 mg·g-1when Pb ions were present because Pb ions took up more adsorption sites.展开更多
A new 3D Cd(II) coordination polymer, [Cd(Hpidc)]n(1, H3 pidc = 2-(pyrid-2-yl)-1H-imidazole-4,5-dicarboxy acid), has been prepared and characterized by elemental analysis, IR spectra, PXRD, and single-crystal X-ray di...A new 3D Cd(II) coordination polymer, [Cd(Hpidc)]n(1, H3 pidc = 2-(pyrid-2-yl)-1H-imidazole-4,5-dicarboxy acid), has been prepared and characterized by elemental analysis, IR spectra, PXRD, and single-crystal X-ray diffraction. Compound 1 crystallizes in orthorhombic, space group Fdd2 with a = 22.833(9), b = 25.536(9), c = 7.437(3) A, V = 4336(3) A3, Z = 16, Dc = 2.105 Mg·m-3, μ = 2.025 mm-1, F(000) = 2656, and the final R = 0.0261 and w R = 0.0636. The structure determination reveals that 1 exhibits a rare 3D 3-connected lig net with a point symbol of(82·10). In addition, the solid state properties such as thermogravimetric analysis and luminescence of 1 were also studied.展开更多
Sawdust (SD) a very low cost material has been utilized as adsorbent material for the removal of Cd (II) from aqueous solutions after treatment with mono methylol urea (MMU) in the presence of zinc chloride as a catal...Sawdust (SD) a very low cost material has been utilized as adsorbent material for the removal of Cd (II) from aqueous solutions after treatment with mono methylol urea (MMU) in the presence of zinc chloride as a catalyst to form MMU-SD. The reaction of MMU-SD was carried out under different conditions including MMU/SD molar ratio, catalyst concentration, and reaction time and temperature. Adsorption studies have been carried out to determine the effect of agitation time, pH, adsorbent and adsorbate concentrations on the adsorption capacity of Cd (II) ions onto MMU-SD. Langmuir, Freundlich and Redlich-Peterson isotherm models were applied in the adsorption studies. The experimental data were analyzed using various sorption kinetic models. The removal processes of Cd (II) onto MMU-SD particles could be well described by the pseudo-second order model. The maximum adsorption capacity of Cd(II) onto MMU-SD was 909 mg/g. Similarly, the Freundlich constant 1/n value was 0.45.展开更多
A supramolecular complex of Cd（II） with 1D water tapes as pillars[Cd2（dpa）2（phen）2（H2O）2]·6H2O 1 （H2dpa = diphenic acid, phen = phenanthroline）, has been synthesized and characterized by elemental analy...A supramolecular complex of Cd（II） with 1D water tapes as pillars[Cd2（dpa）2（phen）2（H2O）2]·6H2O 1 （H2dpa = diphenic acid, phen = phenanthroline）, has been synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1^- with a = 9.7029（4）, b = 11.9601（5）, c = 12.1788（4） A, α = 71.6990（10）, β = 71.8740（10）, γ = 74.4680（10）°, V = 1252.39（8） A^3, C52H48Cd2N4O16, Mr = 1209.76, Z= 1, Dc = 1.604 g/cm^3,μ = 0.925 mm^-1, F（000） = 612, R = 0.0679 and wR = 0.2514 for 3870 observed reflections （I 〉 2σ（I））. Two intramolecular Cd（II） centers of this complex are encircled by two dpa^2- ligands forming an 18-membered ring, which is further assembled into a pillared three-dimensional （3D） supramolecular architecture through the synergetic effect of intermolecular face-to-face π…π stacking and weak O-H…O hydrogen-bonding interactions. Moreover, this complex exhibits photoluminescence with the main emission bands located at about 456 nm upon excitation at 355 nm in the solid state at room temperature.展开更多
通过硫化亚铁梯度管法和邻菲啰啉分光光度法,研究菌株LLDRA6的铁氧化特性。利用扫描电镜-能谱仪(scanning electron microscope-energy spectrum analysis,SEM-EDS)、连二亚硫酸钠-柠檬酸钠-碳酸氢钠(dithionite-citrate-bicarbonate,D...通过硫化亚铁梯度管法和邻菲啰啉分光光度法,研究菌株LLDRA6的铁氧化特性。利用扫描电镜-能谱仪(scanning electron microscope-energy spectrum analysis,SEM-EDS)、连二亚硫酸钠-柠檬酸钠-碳酸氢钠(dithionite-citrate-bicarbonate,DCB)法,以及对两种盆栽水稻籽粒和茎叶的Cd含量检测,探讨菌株LLDRA6对IP形成的影响及其对水稻Cd迁移的阻隔效果。研究表明,LLDRA6在硫化亚铁梯度管中形成明显的Fe(II)氧化圈,接种该菌的LB培养基Fe(II)氧化率高于对照组,表明LLDRA6是一株铁氧化细菌。SEM-EDS显示,经LLDRA6和Fe(II)处理后的水稻根系表面附着有明显的层状沉淀物,沉淀物内含有大量Fe元素。DCB法提取试验显示:经LLDRA6和Fe(II)处理后的根系表面IP含量显著高于其他处理组,表明LLDRA6促进了IP的形成;该处理下的茎叶和籽粒的Cd含量均显著低于其他处理组。菌株LLDRA6促进水稻根系表面IP的形成,以及IP对Cd迁移具有显著的阻隔效果。展开更多
The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results sho...The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results showed that optimum conditions of adsorption by chitosan were:the counteranion species in Cd2+ solution was SO24;pH in Cd2+ solution was 40;the higher temperature and the longer reaction time was good for adsorption.展开更多
The complex containing ferroceneyl, Cd(dppf)I2(dppf=1,1 bis(diphenylphosphino) ferrocene), was synthesized and characterized by IR, Uv vis DRIS spectrum and X ray diffraction. The crystal belongs to monoclinic, space ...The complex containing ferroceneyl, Cd(dppf)I2(dppf=1,1 bis(diphenylphosphino) ferrocene), was synthesized and characterized by IR, Uv vis DRIS spectrum and X ray diffraction. The crystal belongs to monoclinic, space group C2/c, a=37.439(3)?, b=10.2472(6)?, c=18.719(1)?, β=110.4715(16)°, V=6727.8(8)?3, Z=8, Dc=1.818g·cm-3, F(000)=3536, μ=3.015mm-1, R=0.0308, wR=0.0692. dppf coordinates to Cd? as bidentate ligand, and the coordination environment of Cd? is a distorted tetrahedron. The electronic structures of Cd(dppf)I2 and Cd(dppf)Br2 are discussed by quantum chemistry calculation.展开更多
采用凹凸棒土对废水中的Cd(II)进行吸附试验,探讨了吸附时间、凹凸棒土投加量、废水中Cd(II)的初始浓度对吸附率的影响,探索最佳工艺条件;同时考察了酸化改性后凹凸棒土对Cd(II)的吸附性能,并分析了凹凸棒土对Cd(II)的吸附等温线。结果...采用凹凸棒土对废水中的Cd(II)进行吸附试验,探讨了吸附时间、凹凸棒土投加量、废水中Cd(II)的初始浓度对吸附率的影响,探索最佳工艺条件;同时考察了酸化改性后凹凸棒土对Cd(II)的吸附性能,并分析了凹凸棒土对Cd(II)的吸附等温线。结果表明Cd(II)的初始浓度越高,吸附率越低;Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量60 g/L时,去除率达到94.6%;盐酸改性后,Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量40 g/L时,吸附率达93.5%,当凹凸棒土投加量为60 g/L时吸附率达98.2%;从拟合吸附等温线相关性系数来看,Langmuir方程能更好地描述吸附过程中凹凸棒土对Cd(II)的吸附。展开更多
文摘A new nanometer material,nanometer AlO(OH)loaded on the fiberglass with activated carbon fibersfelt(ACF)as the carrier,was prepared by hydrolytic reaction for the removal of Cd(II)from aqueous solution usingcolumn adsorption experiment.As was confirmed by XRD determination,the hydrolysis production loaded on fi-berglass was similar to the orthorhombic phase AlO(OH).SEM images showed that AlO(OH)particles were in theform of small aggregated clusters.The Thomas model was applied for estimating the kinetic parameters and thesaturated adsorption ability of Cd(II)adsorption on the new adsorbent.The results showed that the maximum ad-sorption capacity of Cd(II)was 128.50 mg·g-1and 117.86 mg·g-1for the adsorbent mass of 0.3289 g and the ad-sorbent mass of 0.2867 g,respectively.The elution experiment result indicated that the adsorbed Cd ions was easilydesorbed from the material with 0.1 mol·L-1HCl solution.Adsorption-desorption cycles showed the feasibility ofrepeated uses of the composited material.The adsorption capacities were influenced by pH and the initial Cd(II)concentration.The amount adsorbed was greatest at pH 6.5 and the initial Cd(II)concentration of 0.07 mg·L-1,re-spectively.Nanometer AlO(OH)played a major role in the adsorption process,whereas the fiberglass and ACFwere assistants in the process of removing Cd(II).In addition,the adsorption capacities for Cd(II)were obviouslyreduced from 128.50 mg·g-1to 64.28 mg·g-1when Pb ions were present because Pb ions took up more adsorption sites.
基金Supported by the NSRF of Hubei Provincial Education Office of China(Q20141201)the SRASF of Yichang of Hubei Province(A13-302a-02)
文摘A new 3D Cd(II) coordination polymer, [Cd(Hpidc)]n(1, H3 pidc = 2-(pyrid-2-yl)-1H-imidazole-4,5-dicarboxy acid), has been prepared and characterized by elemental analysis, IR spectra, PXRD, and single-crystal X-ray diffraction. Compound 1 crystallizes in orthorhombic, space group Fdd2 with a = 22.833(9), b = 25.536(9), c = 7.437(3) A, V = 4336(3) A3, Z = 16, Dc = 2.105 Mg·m-3, μ = 2.025 mm-1, F(000) = 2656, and the final R = 0.0261 and w R = 0.0636. The structure determination reveals that 1 exhibits a rare 3D 3-connected lig net with a point symbol of(82·10). In addition, the solid state properties such as thermogravimetric analysis and luminescence of 1 were also studied.
文摘Sawdust (SD) a very low cost material has been utilized as adsorbent material for the removal of Cd (II) from aqueous solutions after treatment with mono methylol urea (MMU) in the presence of zinc chloride as a catalyst to form MMU-SD. The reaction of MMU-SD was carried out under different conditions including MMU/SD molar ratio, catalyst concentration, and reaction time and temperature. Adsorption studies have been carried out to determine the effect of agitation time, pH, adsorbent and adsorbate concentrations on the adsorption capacity of Cd (II) ions onto MMU-SD. Langmuir, Freundlich and Redlich-Peterson isotherm models were applied in the adsorption studies. The experimental data were analyzed using various sorption kinetic models. The removal processes of Cd (II) onto MMU-SD particles could be well described by the pseudo-second order model. The maximum adsorption capacity of Cd(II) onto MMU-SD was 909 mg/g. Similarly, the Freundlich constant 1/n value was 0.45.
基金the State Key Basic Research and Development Plan of China (001CB108906)the Knowledge Innovation Program of the Chinese Academy of Sciences, the NSF (2006J0015)the Major Special Foundation of Fujian Province (2005HZ1027, 2005HZ01-1)
文摘A supramolecular complex of Cd（II） with 1D water tapes as pillars[Cd2（dpa）2（phen）2（H2O）2]·6H2O 1 （H2dpa = diphenic acid, phen = phenanthroline）, has been synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1^- with a = 9.7029（4）, b = 11.9601（5）, c = 12.1788（4） A, α = 71.6990（10）, β = 71.8740（10）, γ = 74.4680（10）°, V = 1252.39（8） A^3, C52H48Cd2N4O16, Mr = 1209.76, Z= 1, Dc = 1.604 g/cm^3,μ = 0.925 mm^-1, F（000） = 612, R = 0.0679 and wR = 0.2514 for 3870 observed reflections （I 〉 2σ（I））. Two intramolecular Cd（II） centers of this complex are encircled by two dpa^2- ligands forming an 18-membered ring, which is further assembled into a pillared three-dimensional （3D） supramolecular architecture through the synergetic effect of intermolecular face-to-face π…π stacking and weak O-H…O hydrogen-bonding interactions. Moreover, this complex exhibits photoluminescence with the main emission bands located at about 456 nm upon excitation at 355 nm in the solid state at room temperature.
文摘通过硫化亚铁梯度管法和邻菲啰啉分光光度法,研究菌株LLDRA6的铁氧化特性。利用扫描电镜-能谱仪(scanning electron microscope-energy spectrum analysis,SEM-EDS)、连二亚硫酸钠-柠檬酸钠-碳酸氢钠(dithionite-citrate-bicarbonate,DCB)法,以及对两种盆栽水稻籽粒和茎叶的Cd含量检测,探讨菌株LLDRA6对IP形成的影响及其对水稻Cd迁移的阻隔效果。研究表明,LLDRA6在硫化亚铁梯度管中形成明显的Fe(II)氧化圈,接种该菌的LB培养基Fe(II)氧化率高于对照组,表明LLDRA6是一株铁氧化细菌。SEM-EDS显示,经LLDRA6和Fe(II)处理后的水稻根系表面附着有明显的层状沉淀物,沉淀物内含有大量Fe元素。DCB法提取试验显示:经LLDRA6和Fe(II)处理后的根系表面IP含量显著高于其他处理组,表明LLDRA6促进了IP的形成;该处理下的茎叶和籽粒的Cd含量均显著低于其他处理组。菌株LLDRA6促进水稻根系表面IP的形成,以及IP对Cd迁移具有显著的阻隔效果。
文摘The effects of various factors,the reaction time,temperature,particle size,initial Cd2+ concentration,pH and different anion,on the adsorption behavior of Cd2+ on chitosan were investigated.The results showed that optimum conditions of adsorption by chitosan were:the counteranion species in Cd2+ solution was SO24;pH in Cd2+ solution was 40;the higher temperature and the longer reaction time was good for adsorption.
文摘The complex containing ferroceneyl, Cd(dppf)I2(dppf=1,1 bis(diphenylphosphino) ferrocene), was synthesized and characterized by IR, Uv vis DRIS spectrum and X ray diffraction. The crystal belongs to monoclinic, space group C2/c, a=37.439(3)?, b=10.2472(6)?, c=18.719(1)?, β=110.4715(16)°, V=6727.8(8)?3, Z=8, Dc=1.818g·cm-3, F(000)=3536, μ=3.015mm-1, R=0.0308, wR=0.0692. dppf coordinates to Cd? as bidentate ligand, and the coordination environment of Cd? is a distorted tetrahedron. The electronic structures of Cd(dppf)I2 and Cd(dppf)Br2 are discussed by quantum chemistry calculation.
文摘采用凹凸棒土对废水中的Cd(II)进行吸附试验,探讨了吸附时间、凹凸棒土投加量、废水中Cd(II)的初始浓度对吸附率的影响,探索最佳工艺条件;同时考察了酸化改性后凹凸棒土对Cd(II)的吸附性能,并分析了凹凸棒土对Cd(II)的吸附等温线。结果表明Cd(II)的初始浓度越高,吸附率越低;Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量60 g/L时,去除率达到94.6%;盐酸改性后,Cd(II)在浓度为20 mg/L、吸附时间60 m in、凹凸棒土投加量40 g/L时,吸附率达93.5%,当凹凸棒土投加量为60 g/L时吸附率达98.2%;从拟合吸附等温线相关性系数来看,Langmuir方程能更好地描述吸附过程中凹凸棒土对Cd(II)的吸附。
