Adsorption of reactive blue 2 dye from aqueous solution by cocoa (Theobroma) cacao shell: An agro solid waste

C. Theivarasu, S. Mylsamy
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Abstract

Activated carbon prepared from agro waste cocoa (Theobroma cacao) shell has been utilized as the adsorbent for the removal of Reactive blue 2 dye from aqueous solution. Adsorption studies were carried out at different initial concentration and contact time, pH of solution and temperature. Adsorption data were modeled using Langmuir, Freundlich, Tempkin and Dubinin-Raduskevich isotherms. Based on correlation coefficient (r2) values, equilibrium data found fitted well to the Langmuir isotherm. Adsorption kinetics was verified by pseudo-first order, pseudo-second order and Intraparticle diffusion models. The kinetic adsorption data fitted the pseudo-second order kinetic model well and also followed the intra-particle diffusion model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° were evaluated. The positive enthalpy shows that the adsorption process was endothermic in nature.
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一种农业固体废弃物——可可壳对活性蓝2染料的吸附
以农业废可可壳为原料制备的活性炭为吸附剂,用于去除水中的活性蓝2染料。在不同初始浓度、接触时间、溶液pH和温度条件下进行吸附研究。吸附数据采用Langmuir、Freundlich、Tempkin和Dubinin-Raduskevich等温线建模。根据相关系数(r2)值,发现平衡数据与Langmuir等温线拟合较好。通过拟一级、拟二级和颗粒内扩散模型验证了吸附动力学。吸附动力学数据符合准二级动力学模型,也符合颗粒内扩散模型。热力学参数如ΔH°,ΔS°和ΔG°进行了评估。正焓表明吸附过程本质上是吸热的。
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