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- W2372693973 abstract "The adsorptive properties of sunflower straw for U ( VI) and Pb ( II) were systematically evaluated in single and binary solutions using batch experiments as a function of solution pH, adsorbent dosage, contact time and initial ion concentration. The kinetic data were analyzed by the pseudo-first-order, pseudo-second-order kinetic and intraparticle diffusion models. The equilibrium sorption data were examined using the Langmuir and Freundlich isotherm equations. It was shown that that a dose of 2.0 g/L of sunflower straw in an initial ions concentration of 20 mg/L with an initial pH of 4. 0 and a contact time of 720 min resulted in the maximum U (VI) and Pb (II) removal efficiency (about 77. 55 % and 87. 44 %, respectively) in U (VI)/Pb ( II) binary system. The kinetic and isotherm experimental data were fitted to the pseudo-second-order rate equation and the Langmuir isotherm model with much satisfaction for single and binary metal systems, respectively. The sorption data of Pb ( II) also conformed successfully to the Freundlich equation at U ( VI) concentration more than 200 mg/L. The maximum adsorption capacity in single system for U (VI) and Pb (II) was calculated to be 327. 0 and 67. 59 mg/g, respectively. The sunflower straw displayed an excellent selectivity in the adsorption of Pb ( II) over U ( VI) in the binary system at lower initial concentrations of ions and the case was vice versa at higher concentrations. Furthermore, SEM, EDX and FT-IR analyses revealed that U ( VI) and Pb ( II) adsorption onto sunflower straw could be predominantly controlled by the ion exchange as well as complexation mechanism." @default.
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- W2372693973 date "2014-01-01" @default.
- W2372693973 modified "2023-09-28" @default.
- W2372693973 title "Extended Study of Sunflower Straw in the Selective Adsorption Behaviors and Mechanisms for U(VI) and Pb(II)" @default.
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