Influencing factors, such as the biomass concentration, pH value, temperature and time of adsorption on the removal of Cd^2＋ were investigated when Sphaerotilus natans was used as a biosorbent. The results show that ...Influencing factors, such as the biomass concentration, pH value, temperature and time of adsorption on the removal of Cd^2＋ were investigated when Sphaerotilus natans was used as a biosorbent. The results show that Sphaerotilus natans has a significant effect on the adsorption of Cd^2＋. The process of adsorption will reach the equilibrium in 20 min. Temperature has no significant effect on the adsorption. The removal rate of Cd^2＋. can approach to 90% under the conditions of pH 5.5, the biomass mass concentration O. 6 g/L and the initial mass concentration of cadmium ≤20 mg/L. The maximum specific uptake is 1.9 mmol/g dry biomass . The adsorption was fitted with the Freundlich isotherm adsorption equation when the concentration of Cd^2＋ is in a range of 0--100 mg/L. HCl and EDTA can desorb Cd^2＋ from biomass effectively.展开更多
A new composite adsorbent, nano-Fe3O4/bacterial cellulose（BC）, was prepared through blending method. The process of adsorbing Cd2＋ including its isotherm and kinetics measured was studied. The results show that the...A new composite adsorbent, nano-Fe3O4/bacterial cellulose（BC）, was prepared through blending method. The process of adsorbing Cd2＋ including its isotherm and kinetics measured was studied. The results show that the adsorption efficiency is improved because of huge surface area and surface coordination of nano-Fe3O4 particles. Its adsorption capacity is 27.97 mg/g and the maximum of Cd2＋ removal is 74%. The adsorption kinetics can be described by pseudo-second rate model and the adsorption equilibrium by Langmuir type. The superparamagnetism of nano-Fe3O4 particles can help to solve the difficult separation of single BC adsorbent and lead to the quick separation of composite adsorbent from the liquid if a magnetic field was applied. Cd2＋ can be desorbed effectively by EDTA and HCl from the composite adsorbent, which can make it be reused.展开更多
A novel complex [Pb（qina）2（DMSO）]·H2O was synthesized, of which qinais the quinaldic acid radical and DMSO the dimethyl sulfoxide. Elemental analysis, IR spectra, and X-ray single-crystal diffraction were car...A novel complex [Pb（qina）2（DMSO）]·H2O was synthesized, of which qinais the quinaldic acid radical and DMSO the dimethyl sulfoxide. Elemental analysis, IR spectra, and X-ray single-crystal diffraction were carried out to determine the composition and crystal structure. This complex belongs to monoclinic system, space group P121/n1, with a = 7.1553（17）, b = 17.543（2）, c = 17.306（2） A, β = 91.671（4）°, C22H20N206PbS, Mr = 647.65, Z = 4, V= 2171.5（6） A3, Dc= 1.981 g/cm^3, μ= 7.908 mm^-1, F（000） = 1248, -9≤h≤6, -23≤k≤19, -22≤1≤22, R= 0.0221 and wR= 0.0488. Weak coordinate bond is formed between oxygen atom in DMSO and Pb（ Ⅱ ）. There are also weak interactions, such as π-π interaction, hydrogen bonds and so on, among the complex molecules.展开更多
A novel complex [Cd2（phen）4（phth）2]·4H2O has been synthesized by the reaction of Hzphth（phthalic acid） and phen（1,10-phenanthroline） with Cd（Ⅱ） in ethanol-water solution. X-ray crystal structure analys...A novel complex [Cd2（phen）4（phth）2]·4H2O has been synthesized by the reaction of Hzphth（phthalic acid） and phen（1,10-phenanthroline） with Cd（Ⅱ） in ethanol-water solution. X-ray crystal structure analysis shows it crystallizes in triclinic, space group PI- with a = 10.619（3）, b = 12.560（4）, c = 12.651（4） A, a = 98.775（5）, β = 109.035（5）,γ = 113-576（5）°, C32H24CdN4O6, Mr= 672.95, V = 1381.7（7）A^3, Rint = 0.0358, Z = 2, Dc= 1.618 g/cm^3,μ = 0.845 mm^-1, -6 ≤h≤13, -15 ≤k ≤13, -15 ≤l≤14, F（000） = 680, S = 1.038, R = 0.0480 and wR = 0.0849 for 3992 observed reflections （1 〉 2σ（Ⅰ））. Phth bridges Cd（Ⅱ） to form a macrocyclic compound, and a 2D supramolecular motif is formed through hydrogen bonds and π-π interaction.展开更多
A novel binucleus complex [Cd2（phen）4（adip）（NO3）2] （phen = phenanthroline, H2adip = adipic acid） has been synthesized by the reaction of phen and H2adip with cadmium（Ⅱ） salt. Elemental analysis, IR spectra ...A novel binucleus complex [Cd2（phen）4（adip）（NO3）2] （phen = phenanthroline, H2adip = adipic acid） has been synthesized by the reaction of phen and H2adip with cadmium（Ⅱ） salt. Elemental analysis, IR spectra and X-ray crystal structure analysis were carried out to determine the crystal structure of the title complex. The crystal belongs to triclinic, space group P1^- with a = 9.638（7）, b = 10.315（7）, c = 13.109（10） A, α = 88.305（11）, β = 69.011（11）, γ = 75.818（11）°, C27H20N5O5Cd, Mr = 606.88, Z = 2, V = 1177.2（14）A^3, Dc = 1.712 g/cm^3,μ= 0.979 mm^-1, -8≤h ≤11, -12≤k≤ 12, -10≤l≤ 15, F（000） = 610, Rint = 0.0314, R = 0.0739 and wR = 0.1922 （Ⅰ〉 2σ（Ⅰ）. The cadmium atom is seven-coordinated in a distorted pentagonal bipyramidal configuration. The complex forms a 2-D supramolecular framework by C-H…O weak interactions and π-π stacking of neighbouring phen ligands.展开更多
文摘Influencing factors, such as the biomass concentration, pH value, temperature and time of adsorption on the removal of Cd^2＋ were investigated when Sphaerotilus natans was used as a biosorbent. The results show that Sphaerotilus natans has a significant effect on the adsorption of Cd^2＋. The process of adsorption will reach the equilibrium in 20 min. Temperature has no significant effect on the adsorption. The removal rate of Cd^2＋. can approach to 90% under the conditions of pH 5.5, the biomass mass concentration O. 6 g/L and the initial mass concentration of cadmium ≤20 mg/L. The maximum specific uptake is 1.9 mmol/g dry biomass . The adsorption was fitted with the Freundlich isotherm adsorption equation when the concentration of Cd^2＋ is in a range of 0--100 mg/L. HCl and EDTA can desorb Cd^2＋ from biomass effectively.
基金Supported by the National Natural Science Foundation of China(No.50174014)
文摘A new composite adsorbent, nano-Fe3O4/bacterial cellulose（BC）, was prepared through blending method. The process of adsorbing Cd2＋ including its isotherm and kinetics measured was studied. The results show that the adsorption efficiency is improved because of huge surface area and surface coordination of nano-Fe3O4 particles. Its adsorption capacity is 27.97 mg/g and the maximum of Cd2＋ removal is 74%. The adsorption kinetics can be described by pseudo-second rate model and the adsorption equilibrium by Langmuir type. The superparamagnetism of nano-Fe3O4 particles can help to solve the difficult separation of single BC adsorbent and lead to the quick separation of composite adsorbent from the liquid if a magnetic field was applied. Cd2＋ can be desorbed effectively by EDTA and HCl from the composite adsorbent, which can make it be reused.
基金the Natural Science Foundation of China (20671064)Natural Science Foundation of Liaoning Province (20052014)
文摘A novel complex [Pb（qina）2（DMSO）]·H2O was synthesized, of which qinais the quinaldic acid radical and DMSO the dimethyl sulfoxide. Elemental analysis, IR spectra, and X-ray single-crystal diffraction were carried out to determine the composition and crystal structure. This complex belongs to monoclinic system, space group P121/n1, with a = 7.1553（17）, b = 17.543（2）, c = 17.306（2） A, β = 91.671（4）°, C22H20N206PbS, Mr = 647.65, Z = 4, V= 2171.5（6） A3, Dc= 1.981 g/cm^3, μ= 7.908 mm^-1, F（000） = 1248, -9≤h≤6, -23≤k≤19, -22≤1≤22, R= 0.0221 and wR= 0.0488. Weak coordinate bond is formed between oxygen atom in DMSO and Pb（ Ⅱ ）. There are also weak interactions, such as π-π interaction, hydrogen bonds and so on, among the complex molecules.
基金The project was supported by the NSF of Liaoning Province (No. 20022018)
文摘A novel complex [Cd2（phen）4（phth）2]·4H2O has been synthesized by the reaction of Hzphth（phthalic acid） and phen（1,10-phenanthroline） with Cd（Ⅱ） in ethanol-water solution. X-ray crystal structure analysis shows it crystallizes in triclinic, space group PI- with a = 10.619（3）, b = 12.560（4）, c = 12.651（4） A, a = 98.775（5）, β = 109.035（5）,γ = 113-576（5）°, C32H24CdN4O6, Mr= 672.95, V = 1381.7（7）A^3, Rint = 0.0358, Z = 2, Dc= 1.618 g/cm^3,μ = 0.845 mm^-1, -6 ≤h≤13, -15 ≤k ≤13, -15 ≤l≤14, F（000） = 680, S = 1.038, R = 0.0480 and wR = 0.0849 for 3992 observed reflections （1 〉 2σ（Ⅰ））. Phth bridges Cd（Ⅱ） to form a macrocyclic compound, and a 2D supramolecular motif is formed through hydrogen bonds and π-π interaction.
基金This work was supported by the Foundation of Education Committee of Liaoning Province (No. 2004c021) and Foundation of Excellent Personal of Shenyang Institute of Chemical Technology
文摘A novel binucleus complex [Cd2（phen）4（adip）（NO3）2] （phen = phenanthroline, H2adip = adipic acid） has been synthesized by the reaction of phen and H2adip with cadmium（Ⅱ） salt. Elemental analysis, IR spectra and X-ray crystal structure analysis were carried out to determine the crystal structure of the title complex. The crystal belongs to triclinic, space group P1^- with a = 9.638（7）, b = 10.315（7）, c = 13.109（10） A, α = 88.305（11）, β = 69.011（11）, γ = 75.818（11）°, C27H20N5O5Cd, Mr = 606.88, Z = 2, V = 1177.2（14）A^3, Dc = 1.712 g/cm^3,μ= 0.979 mm^-1, -8≤h ≤11, -12≤k≤ 12, -10≤l≤ 15, F（000） = 610, Rint = 0.0314, R = 0.0739 and wR = 0.1922 （Ⅰ〉 2σ（Ⅰ）. The cadmium atom is seven-coordinated in a distorted pentagonal bipyramidal configuration. The complex forms a 2-D supramolecular framework by C-H…O weak interactions and π-π stacking of neighbouring phen ligands.
