The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Jeffrey Philip Obbard - One of the best experts on this subject based on the ideXlab platform.
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evaluation of an elevated non ionic surfactant critical micelle concentration in a soil Aqueous System
Water Research, 2002Co-Authors: Zhongming Zheng, Jeffrey Philip ObbardAbstract:Abstract In this study, an elevated non-ionic surfactant critical micelle concentration (CMC) in a soil/Aqueous System was examined. Experimental measurements have been made of surfactant solubilization of polycyclic aromatic hydrocarbons (PAH) (i.e. fluoranthene and pyrene) in a 5-month aged PAH contaminated soil, as well as surfactant sorption onto soil. Fluoranthene and pyrene in the soil/Aqueous System in the presence of three non-ionic surfactants (i.e. Tween 80, Triton X-100 and Brij 35) were extracted using dichloramethane and analyzed using GC-MS. Maximum sorption of non-ionic surfactant onto soil was evaluated using a surface tension technique. It was observed that PAH solubilization is proportional to surfactant dose after the elevated CMC, termed as the effective CMC (CMCeff), is achieved. The values of surfactant CMCeff assessed by the surface tension technique were found to be similar to those determined from surfactant PAH solublization, thereby proving the research hypothesis that surfactant sorption is the cause for the elevation of surfactant CMC in a soil/Aqueous System.
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Evaluation of an elevated non-ionic surfactant critical micelle concentration in a soil/Aqueous System
Water research, 2002Co-Authors: Zhongming Zheng, Jeffrey Philip ObbardAbstract:In this study, an elevated non-ionic surfactant critical micelle concentration (CMC) in a soil/Aqueous System was examined. Experimental measurements have been made of surfactant solubilization of polycyclic aromatic hydrocarbons (PAH) (i.e. fluoranthene and pyrene) in a 5-month aged PAH contaminated soil, as well as surfactant sorption onto soil. Fluoranthene and pyrene in the soil/Aqueous System in the presence of three non-ionic surfactants (i.e. Tween 80, Triton X-100 and Brij 35) were extracted using dichloramethane and analyzed using GC-MS. Maximum sorption of non-ionic surfactant onto soil was evaluated using a surface tension technique. It was observed that PAH solubilization is proportional to surfactant dose after the elevated CMC, termed as the effective CMC (CMCeff), is achieved. The values of surfactant CMCeff assessed by the surface tension technique were found to be similar to those determined from surfactant PAH solublization, thereby proving the research hypothesis that surfactant sorption is the cause for the elevation of surfactant CMC in a soil/Aqueous System.
Xiaoyao Dao - One of the best experts on this subject based on the ideXlab platform.
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fluorescent zn pdc tb3 coordination polymer nanostructure a candidate for highly selective detections of cefixime antibiotic and acetone in Aqueous System
Inorganic Chemistry, 2018Co-Authors: Hong Pan, Sufan Wang, Xiaoyao DaoAbstract:Tb3+-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb3+, or [Zn(2,5-PDC)(H2O)2]·H2O/Tb3+) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO3)2, Tb(NO3)3, and 2,5-Na2PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb3+ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in Aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb3+ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an Aqueous System. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV-vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb3+ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water System.
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Fluorescent Zn-PDC/Tb3+ Coordination Polymer Nanostructure: A Candidate for Highly Selective Detections of Cefixime Antibiotic and Acetone in Aqueous System
2018Co-Authors: Hong Pan, Sufan Wang, Xiaoyao DaoAbstract:Tb3+-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb3+, or [Zn(2,5-PDC)(H2O)2]·H2O/Tb3+) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO3)2, Tb(NO3)3, and 2,5-Na2PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb3+ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in Aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb3+ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an Aqueous System. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV–vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb3+ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water System
Zhongming Zheng - One of the best experts on this subject based on the ideXlab platform.
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evaluation of an elevated non ionic surfactant critical micelle concentration in a soil Aqueous System
Water Research, 2002Co-Authors: Zhongming Zheng, Jeffrey Philip ObbardAbstract:Abstract In this study, an elevated non-ionic surfactant critical micelle concentration (CMC) in a soil/Aqueous System was examined. Experimental measurements have been made of surfactant solubilization of polycyclic aromatic hydrocarbons (PAH) (i.e. fluoranthene and pyrene) in a 5-month aged PAH contaminated soil, as well as surfactant sorption onto soil. Fluoranthene and pyrene in the soil/Aqueous System in the presence of three non-ionic surfactants (i.e. Tween 80, Triton X-100 and Brij 35) were extracted using dichloramethane and analyzed using GC-MS. Maximum sorption of non-ionic surfactant onto soil was evaluated using a surface tension technique. It was observed that PAH solubilization is proportional to surfactant dose after the elevated CMC, termed as the effective CMC (CMCeff), is achieved. The values of surfactant CMCeff assessed by the surface tension technique were found to be similar to those determined from surfactant PAH solublization, thereby proving the research hypothesis that surfactant sorption is the cause for the elevation of surfactant CMC in a soil/Aqueous System.
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Evaluation of an elevated non-ionic surfactant critical micelle concentration in a soil/Aqueous System
Water research, 2002Co-Authors: Zhongming Zheng, Jeffrey Philip ObbardAbstract:In this study, an elevated non-ionic surfactant critical micelle concentration (CMC) in a soil/Aqueous System was examined. Experimental measurements have been made of surfactant solubilization of polycyclic aromatic hydrocarbons (PAH) (i.e. fluoranthene and pyrene) in a 5-month aged PAH contaminated soil, as well as surfactant sorption onto soil. Fluoranthene and pyrene in the soil/Aqueous System in the presence of three non-ionic surfactants (i.e. Tween 80, Triton X-100 and Brij 35) were extracted using dichloramethane and analyzed using GC-MS. Maximum sorption of non-ionic surfactant onto soil was evaluated using a surface tension technique. It was observed that PAH solubilization is proportional to surfactant dose after the elevated CMC, termed as the effective CMC (CMCeff), is achieved. The values of surfactant CMCeff assessed by the surface tension technique were found to be similar to those determined from surfactant PAH solublization, thereby proving the research hypothesis that surfactant sorption is the cause for the elevation of surfactant CMC in a soil/Aqueous System.
Tianlong Deng - One of the best experts on this subject based on the ideXlab platform.
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phase equilibrium for the Aqueous System containing lithium sodium potassium chloride and borate ions at 298 15 k
Journal of Chemical & Engineering Data, 2004Co-Authors: Tianlong DengAbstract:The solubility of the Aqueous System containing lithium, sodium, potassium, chloride, and borate ions and the densities, viscosities, refractive indexes, conductivities, and pH at 298.15 K of the s...
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phase equilibrium for the Aqueous System containing lithium sodium potassium chloride and borate ions at 298 15 k
Journal of Chemical & Engineering Data, 2004Co-Authors: Tianlong DengAbstract:The solubility of the Aqueous System containing lithium, sodium, potassium, chloride, and borate ions and the densities, viscosities, refractive indexes, conductivities, and pH at 298.15 K of the System have been studied. On the basis of the Janeche index values, the phase diagrams of dry salt, sodium, and water of the System were plotted. The dry-salt phase diagram of the System includes two four-salt cosaturation points, five solubility isotherm curves, and four crystallization zones all saturated with sodium chloride corresponding to potassium chloride, lithium chloride monohydrate, borax, and lithium borate trihydrate. No solid solution and double salts were found. On the basis of Pitzer's semiempirical equation for a mixed Aqueous electrolytic solution, the chemical equilibrium model of Harvie was used to fit the single-salt Pitzer parameters of lithium borate, β(0), β(1), and Cφ and the triplet mixed parameters ΨLi,Cl,B4O5(OH)4, ΨLi,K,B4O5(OH)4, and ΨLi,Na,B4O5(OH)4 in this System, which are not rep...
Hong Pan - One of the best experts on this subject based on the ideXlab platform.
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fluorescent zn pdc tb3 coordination polymer nanostructure a candidate for highly selective detections of cefixime antibiotic and acetone in Aqueous System
Inorganic Chemistry, 2018Co-Authors: Hong Pan, Sufan Wang, Xiaoyao DaoAbstract:Tb3+-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb3+, or [Zn(2,5-PDC)(H2O)2]·H2O/Tb3+) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO3)2, Tb(NO3)3, and 2,5-Na2PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb3+ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in Aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb3+ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an Aqueous System. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV-vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb3+ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water System.
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Fluorescent Zn-PDC/Tb3+ Coordination Polymer Nanostructure: A Candidate for Highly Selective Detections of Cefixime Antibiotic and Acetone in Aqueous System
2018Co-Authors: Hong Pan, Sufan Wang, Xiaoyao DaoAbstract:Tb3+-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb3+, or [Zn(2,5-PDC)(H2O)2]·H2O/Tb3+) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO3)2, Tb(NO3)3, and 2,5-Na2PDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb3+ ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in Aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb3+ nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an Aqueous System. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV–vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb3+ nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water System