Kinetics and Isotherms Adsorption of Reactive Dye by Thermally Treated Dolomite
Proceedings of the Third International Symposium on Materials and Sustainable Development(2018)
摘要
Kinetic and equilibrium data of the adsorption of reactive black 5 (RB5) from synthetic solutions on Algerian dolomite were determined experimentally. The obtained samples, i.e., raw dolomite and its form heated at 900 °C (D900), were characterized by XRD and SEM. The kinetic mechanism is enough complex, involving different models such as those of pseudo-second order, intraparticle diffusion, and Elovich. The adsorption of RB5 at equilibrium increases strongly with increasing adsorption temperature. The affinity sequence is D900 >> raw dolomite with amounts adsorbed of 125.9 and 38.20 mg g−1, respectively. This difference would be correlated with the weight loss percentage and crystallographic properties. The kinetic mechanism involving different models such as those of pseudo-second-order, intraparticle diffusion, and Elovich. The isotherms are found to be suitably fitted by the Redlich-Peterson equation, a model including three adjustable parameters and requiring nonlinear least-square analysis. A close agreement exists between the evolution of kinetic, thermodynamic and equilibrium, parameters, indicate chemisorption process. The fact that maximum adsorption occurs at isoelectric point emphasizes the prevalence of the non-electrostatic interaction. The process reflects for D900 a weak chemical interaction via a mechanism of surface complexation. In view of its adsorbed amount, D900 appears very effective for removing reactive dyes from wastewaters.
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关键词
Dolomite, Reactive blac 5, Adsorption, Redlich-Peterson model, Mechanism
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