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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Assessment of the adsorption kinetics, equilibrium and thermodynamic for the potential removal of reactive red dye using eggshell biocomposite beads
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Assessment of the adsorption kinetics, equilibrium and thermodynamic for the potential removal of reactive red dye using eggshell biocomposite beads

机译：评估使用蛋壳生物复合珠潜在去除活性红色染料的吸附动力学，平衡和热力学

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摘要

Immobilized eggshell with a polymer mixture of alginate and polyvinyl alcohol was applied as a biocomposite adsorbent (ESC) for the adsorption of C.I. Remazol Reactive Red 198 from aqueous solution. ESC was characterized using XRD, TGA, FTIR and SEM. The Red dye adsorption onto the ESC was investigated in a batch system with respect to initial dye concentration, pH, contact time, agitation speed, solution temperature and biocomposite dosage. The prepared biocomposite exhibits high efficiency for red dye adsorption and the equilibrium states could be achieved in 3 h for the different studied initial dye concentrations. The equilibrium isotherm study indicated that sorption data were analyzed and fitted well by both Langmuir and Temkin models compared to Freundlich model. The maximum monolayer dye adsorption capacity (at the optimum pH 1.0) was estimated to be 46.9 mg/g at 22 °C. The kinetic study revealed that pseudo-second order model fitted well the kinetic data, while both the intraparticle diffusion and Boyd kinetic model indicated that intraparticle diffusion was the main rate determining step in the biosorption process. The negative values of both the enthalpy (△H°) and Gibbs free energy (△G°) changes indicate exothermic as well as feasible and spontaneous nature of the biosorption process respectively.
机译：用藻酸盐和聚乙烯醇的聚合物混合物固定的蛋壳被用作生物复合吸附剂（ESC），以吸附C.I.。来自水溶液的Remazol活性红198。使用XRD，TGA，FTIR和SEM表征ESC。在批处理系统中，针对初始染料浓度，pH，接触时间，搅拌速度，溶液温度和生物复合剂量，研究了红色染料对ESC的吸附。制备的生物复合材料对红色染料的吸附具有很高的效率，并且对于不同的研究初始染料浓度，可以在3小时内达到平衡状态。平衡等温线研究表明，与Freundlich模型相比，Langmuir和Temkin模型对吸附数据进行了分析和拟合。在22°C下，最大单层染料吸附容量（在最佳pH 1.0下）估计为46.9 mg / g。动力学研究表明，伪二级模型很好地拟合了动力学数据，而颗粒内扩散和博伊德动力学模型均表明，颗粒内扩散是生物吸附过程中决定速率的主要步骤。焓（△H°）和吉布斯自由能（△G°）变化的负值分别表示生物吸附过程的放热，可行和自发性质。

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