Activated Carbon Based on Acacia Wood (<i>Auriculeaformis</i>, C&ocircte d’Ivoire) and Application to the Environment through the Elimination of Pb<sup>2+</sup>Ions in Industrial Effluents

• 作者: Drissa Ouattara Kra Grah Patrick Atheba N’da Arsène Kouadio Patrick Drogui Albert Trokourey
• 来源期刊: 封装与吸附期刊(英文)
• 学科: 化学
• 关键词: Acacia auriculeaformis Activated Carbon Lead(II) Ion Adsorption Isotherms Kinetics
• 年，卷（期）: 2021,（1）
• 页码范围: 18-43
• 页数: 26页
• 分类号: O64

摘要

The objective of this study is to develop carbon, that of <i></span><i><span style="font-family:Verdana;">Acacia auriculeaformis</span></i><span style="font-family:Verdana;"></i></span><span style="font-family:Verdana;"> through its activation in order to eliminate lead in an aqueous medium. A series of activated carbon has been prepared by chemical activation with phosphoric acid, sodium hydroxide and sodium chloride. The determi</span><span style="font-family:Verdana;">nation of the physico-chemical properties of the prepared carbon guided the choice of phosphoric acid activated carbon as the best adsorbent for the</span><span style="font-family:Verdana;"> elimination of lead(II) in </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">an </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">aqueous solution. Pb</span>^{<span style="font-family:Verdana;">2+</span>}<span style="font-family:Verdana;"> adsorption tests in batch mode have shown that the adsorption capacity is influenced by various parameters such as mass, pH, concentration of Pb²⁺ ions and contact time linked to the medium and the adsorbent. Adsorption isotherms, kinetic models and thermodynamics have been used to describe the adsorption process. The equilibrium data for activated charcoal correspond well to the model of Freundlich, </span><span style="font-family:Verdana;">Langmuir, Temkin and Kiselev. The kinetic adsorption data proved to be </span><span style="font-family:Verdana;">better described by the pseudo-second order model with </span><span style="font-family:Verdana;">external and intraparticle diffusion which are two decisive steps in the</span><span style="font-family:Verdana;"> adsorption process of Pb²⁺ ions. Thermodynamics and adsorption isotherms predict a spontaneous exothermic surface reaction, of the chemisorption type, with ion </span><span><span style="font-family:Verdana;">retention