Chemical Engineering Area, Central Leather Research Institute (Council of Scientific & Industrial Research), Adyar, Chennai 600 020, India.
Chemosphere. 2011 Mar;82(10):1367-72. doi: 10.1016/j.chemosphere.2010.11.080. Epub 2010 Dec 21.
Chemically prepared activated carbon material derived from palm flower was used as adsorbent for removal of Amido Black dye in aqueous solution. Batch adsorption studies were performed for the removal of Amido Black 10B (AB10B), a di-azo acid dye from aqueous solutions by varying the parameters like initial solution pH, adsorbent dosage, initial dye concentration and temperature with three different particle sizes such as 100 μm, 600 μm and 1000 μm. The zero point charge was pH 2.5 and the maximum adsorption occurred at the pH 2.3. Experimental data were analyzed by model equations such as Langmuir, Freundlich and Temkin isotherms and it was found that the Freundlich isotherm model best fitted the adsorption data and the Freundlich constants varied from (K(F)) 1.214, 1.077 and 0.884 for the three mesh sizes. Thermodynamic parameters such as ΔG, ΔH and ΔS were also calculated for the adsorption processes and found that the adsorption process is feasible and it was the endothermic reaction. Adsorption kinetics was determined using pseudo first-order, pseudo second-order rate equations and also Elovich model and intraparticle diffusion models. The results clearly showed that the adsorption of AB10B onto lignocellulosic waste biomass from palm flower (LCBPF) followed pseudo second-order model, and the pseudo second-order rate constants varied from 0.059 to 0.006 (g mg(-1)min) by varying initial adsorbate concentration from 25 mg L(-1) to 100 mg L(-1). Analysis of the adsorption data confirmed that the adsorption process not only followed intraparticle diffusion but also by the film diffusion mechanism.
化学制备的棕榈花基活性炭材料被用作吸附剂，用于去除水溶液中的偶氮酸性黑 10B（AB10B）染料。通过改变初始溶液 pH 值、吸附剂用量、初始染料浓度和温度等参数，进行了去除偶氮酸性黑 10B（AB10B）染料的批量吸附研究，采用了三种不同粒径的吸附剂，分别为 100μm、600μm 和 1000μm。零电荷点 pH 值为 2.5，最大吸附发生在 pH 值为 2.3。实验数据通过 Langmuir、Freundlich 和 Temkin 等温线等模型方程进行了分析，结果表明，Freundlich 等温线模型最适合吸附数据，Freundlich 常数在三种筛网尺寸下分别为 1.214、1.077 和 0.884。还计算了吸附过程的热力学参数，如ΔG、ΔH 和ΔS，发现吸附过程是可行的，是吸热反应。通过拟一级、拟二级速率方程以及 Elovich 模型和内扩散模型确定了吸附动力学。结果清楚地表明，AB10B 对棕榈花木质纤维素废物生物质（LCBPF）的吸附遵循拟二级动力学模型，初始吸附质浓度从 25mg L(-1)到 100mg L(-1)变化时，拟二级速率常数从 0.059 变化到 0.006（g mg(-1)min）。吸附数据的分析证实，吸附过程不仅遵循内扩散，还遵循膜扩散机制。
