Title: Science China-Chemistry

Title: Science China-Chemistry

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? Xu, X., Gao, Y., Gao, B.Y., Yue, Q.Y. and Zhong, Q.Q. (2010), Adsorption studies of the removal of anions from aqueous solutions onto an adsorbent prepared from wheat straw. Science China-Chemistry, 53 (6), 1414-1419.

Full Text: 2010\Sci Chi-Che53, 1414.pdf

Abstract: Modified wheat straw (MWS) was prepared by the grafting of epichlorohydrin, triethylamine and ethylenediamine onto WS. The characteristics of MWS and its adsorption capacity for NO₃^-, PO₄^3- and Cr₂O₇^2-. were investigated. The results indicate that amine groups with positive charge have been introduced into the structure of MWS, and significantly increased its anion ad-sorption property. The functions of MWS dosage, the solution pH, the contact time and temperature have significant influence on the adsorption process, and the adsorption is well fitted with the Langmuir equation and pseudo second-order model. The maximum adsorption capacity of MWS for NO₃^-, PO₄^3-. (P) and Cr₂O₇^2-. (Cr) is 53.5, 62.4 and 386.2 mg g^-1, respectively.

Keywords: Acid, Adsorbent, Adsorption, Anion, Dyes, Ion-Exchange, Langmuir, Maximum Adsorption Capacity, Nitrate, Residue, Wheat Straw

? Qian, L.J., Hu, P.Z., Jiang, Z.J., Geng, Y.X. and Wu, W.S. (2010), Effect of pH, fulvic acid and temperature on the sorption of uranyl on ZrP₂O₇. Science China-Chemistry, 53 (6), 1429-1437.

Full Text: 2010\Sci Chi-Che53, 1429.pdf

Abstract: The sorption of UO₂²⁺ onto ZrP₂O₇ was studied using the batch technique and the point of zero charge of ZrP₂O₇ was obtained through mass titration. The results indicated that sorption of UO₂²⁺ onto ZrP₂O₇ was strongly affected by pH, solid-to-liquid ratio (m/V), the species of electrolyte in solution and fulvic acid (FA), but was insensitive to ionic strength. The sorption of UO₂²⁺ increased with increasing pH and m/V. The presence of FA enhanced UO₂²⁺ sorption onto ZrP₂O₇ at low pH. The presence of phosphate or sulfate caused opposite effects on the sorption of UO₂²⁺ onto ZrP₂O₇. Addition of citrate also significantly affected UO₂²⁺ sorption. The sorption of UO₂²⁺ increased as the temperature of the system increased. The Langmuir and Freundlich models were used to simulate the sorption isotherms of UO₂²⁺ onto ZrP₂O₇ at different temperatures. The results indicated that the Freundlich model described UO₂²⁺ sorption better than the Langmuir model. Thermodynamic parameters for the sorption process were calculated from the temperature dependent sorption isotherms. The results suggested that the sorption process of UO₂²⁺ onto ZrP₂O₇ is spontaneous and endothermic. The desorption process of UO₂²⁺ from ZrP₂O₇ was also investigated and it was found that sorption onto ZrP2O7 was irreversible.

Keywords: Batch, Contact Time, Desorption, Diphosphate, Eu(III), Ionic-Strength, Isotherms, Langmuir, Low, Phosphate, Phosphate-Compounds, Solution Interface, Sorption, Thermodynamic, Thermodynamic Data, Uranium(VI), Uranyl, XPS, Zirconium, ZrP₂O₇

? Wang, X.F., Shi, K.L., Guo, Z.J. and Wu, W.S. (2010), Eu(III) adsorption on rutile: Batch experiments and modeling. Science China-Chemistry, 53 (12), 2628-2636.

Full Text: 2010\Sci Chi Che53, 2628.pdf

Abstract: Eu(III) adsorption on rutile was investigated as a function of contact time, pH, ionic strength and Eu(III) concentration by using a batch experimental method. The effects of carbonate, sulfate, and phosphate were also studied. It was found that the kinetics of Eu(III) adsorption on rutile could be described by a pseudo-second-order model. The adsorption of Eu(III) on rutile is strongly pH-dependent, but relatively insensitive to ionic strength. A double layer model (DLM) with two inner-sphere Eu(III) surface complexes was applied to quantitatively interpret the adsorption of Eu(III) on rutile. There were no apparent effects of carbonate and sulfate on Eu(III) adsorption, whereas the presence of phosphate promoted Eu(III) adsorption on rutile. The surface complexes of Eu(III) on rutile were evidenced by X-ray photoelectron spectroscopy (XPS).

Keywords: 250-º-C, Adsorption, Aqueous-Solutions, Batch, Carbonate, Concentration, Eu(III), Europium, Experimental, Experiments, Function, Ionic Strength, Ionic-Strength, Kinetics, Model, Modeling, pH, pH-Dependent, Phosphate, Pseudo Second Order, Pseudo-Second-Order, Pseudo-Second-Order Model, Rutile, Sorption, Spectroscopy, Strength, Sulfate, Surface, Surface Complexation, Surface Complexes, TiO₂ Anatase, Water Interface, X-Ray, X-Ray Photoelectron Spectroscopy, XPS

? Xie, H.J., Liu, W.F., Zhang, J., Zhang, C.L. and Ren, L. (2011), Sorption of norfloxacin from aqueous solutions by activated carbon developed from Trapa natans husk. Science China-Chemistry, 54 (5), 835-843.

Full Text: 2011\Sci Chi-Che54, 835.pdf

Abstract: The low-cost activated carbon was prepared from a renewable aquatic plant residue, Trapa natans husk, and tested for its ability to remove norfloxacin (NOR) from aqueous solutions. Physical and chemical properties of the Trapa natans husk activated carbon (TAC) were characterized. TAC has a large surface area of 1274 m²/g and mesoporous structure. Carboxylic and hydroxyl groups contributed to the sorption of NOR onto TAC but they were not the most important factors in the sorption process. The rates of adsorption followed the pseudo-second-order kinetics and the overall rate of NOR uptake was controlled by both external mass transfer and intro particle diffusion during the entire adsorption period. The equilibrium data fitted well with the Freundlich and Tempkin models and the sorption was found to be a favorable process. The adsorption of NOR by TAC was strongly dependent on the solution pH. Electrostatic interaction and hydrophobic interaction were proposed to be the principal NOR sorption mechanism.

Keywords: Activated Carbon, Adsorption, Adsorption, Antimicrobials, Behavior, Diffusion, Environment, Equilibrium, Fluoroquinolone Antibacterial Agents, Freundlich, Kinetic and Isotherms, Kinetics, Mechanism, Mechanisms, Norfloxacin, pH, Sorption, Temperature, Tempkin, Trapa Natans Husk, Uptake