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Study on the Sorption of Pb(Ⅱ) and Th(Ⅳ) onto Gaomiaozi Bentonite

Author: WangSuoWei
Tutor: DongYunHui；WangXiangKe
School: Shandong University of Technology
Course: Applied Chemistry
Keywords: GMZ bentonite Potentiometric titration Adsorption pH Thermodynamics Mechanism
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 167
Quote: 0
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Abstract


Bentonite is our abundant clay mineral, with a unique crystal structure, good adsorption of metal ions. Bentonite is used in wastewater treatment, easy operation, good effect, low cost advantage. Bentonite also because of its good physical and chemical properties as high-level radioactive waste geological disposal candidate fill material. In this thesis, the heavy metal ions Pb (Ⅱ) and radionuclide Th (Ⅳ) on GMZ bentonite sorption behavior and mechanism. The paper first introduces the background of the topic, based on study of the basic content and the overall program. Details associated with the solid - liquid interface adsorption of some of the basic concepts and theories. Papers with instruments such as XRD, FTIR and acid-base titration of the GMZ bentonite for the characterization of structural, functional groups and surface adsorption sites. The study found that montmorillonite is the main component of the bentonite, bentonite surface such as a hydroxyl group, Al-O-Si and Si-O functional group. Bentonite surface adsorption sites form ≡ SO - the the ≡ SOH and ≡ SOH 2 . . The effects of shaking time, pH, fulvic acid (FA) and humic acid (HA), adsorbent concentration, ionic strength, different electrolyte ions and temperature factors of GMZ bentonite adsorption Pb (II) and Th ( Ⅳ) the impact of the experimental results showed that adsorption reached equilibrium within a few hours can be, the pH value and ionic strength is the major factor affecting adsorption surface complexation and ion exchange is the main mechanism of adsorption, mainly for low pH value under the conditions for the ion exchange and high pH conditions for surface complexation; played a facilitating role at low pH, HA bentonite on the adsorption of Pb (Ⅱ) and Th (Ⅳ); adsorption isotherms with Langmuir, Freundlich and Dubinin-Radushkevich (DR) isotherm model to fit the Langmuir model fitting adsorption isotherms of Pb (Ⅱ) and Th (Ⅳ) works best. Investigated at different temperatures sorb Pb (II) and Th (Ⅳ) thermodynamic parameters (ΔH 0 ΔS 0 and ΔG of 0 ), to the conclusion that the adsorption of Pb (Ⅱ) and Th (Ⅳ) on the bentonite is a spontaneous endothermic process. Pb (Ⅱ) and Th (Ⅳ) on the bentonite adsorption mechanism, the results showed that Pb (Ⅱ) and Th (Ⅳ) adsorption mechanism on the bentonite surface complexation, cation exchange at low pH they also played a certain role. The research results show that the GMZ bentonite as a solution Pb (II) and Th (Ⅳ) suitable adsorbent material.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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