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首页> 外文会议>Moratuwa Engineering Research Conference >Adsorption of cadmium and lead heavy metals by chitosan biopolymer: A study on equilibrium isotherms and kinetics
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Adsorption of cadmium and lead heavy metals by chitosan biopolymer: A study on equilibrium isotherms and kinetics

机译：壳聚糖生物聚合物吸附镉和铅重金属：均衡等温线和动力学研究

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Since heavy metal pollution is a significant aspect to aquatic ecosystems, the objective of this research work was to investigate adsorption characteristics of chitosan as an alternative adsorbent material. In this study, chitosan, synthesized from locally available shrimp type “penaeus monodon” was used to observe adsorption characteristics of cadmium (Cd) and lead (Pb) heavy metals from aqueous solution. Batch kinetic experiment studies were conducted for changing initial pH, initial concentration of metal ions, particle size and degree of deacetylation (DD) of chitosan. Simplified models such as, pseudo first order, pseudo second order and intra-particle diffusion models were used to analyze the experimental data. The result showed that the adsorption capacity strongly depends on pH and DD. It was clearly seen that higher adsorption of heavy metals occur at comparatively high pH and high DD. Equilibrium experimental data were analyzed by using two different isotherm models namely, Langmuir and Freundlich. The characteristic parameters for each isotherm and related correlation coefficients were determined by using mathematical modeling software. Isotherms show that adsorption process of Cd and Pb is a heterogeneous process.
机译：由于重金属污染是水生生态系统的重要方面，这项研究的目的是研究壳聚糖作为替代吸附材料的吸附特征。在本研究中，从局部可用的虾型“Penaeus Monodon”合成的壳聚糖用于观察来自水溶液的镉（Cd）和铅（Pb）重金属的吸附特性。进行批次动力学实验研究以改变初始pH，初始浓度的壳聚糖脱乙酰化（DD）的初始浓度，粒径和脱乙酰（DD）。使用简化的模型，如伪第一顺序，伪二阶和粒子扩散模型来分析实验数据。结果表明，吸附能力强烈取决于pH和DD。清楚地看出，在相对高的pH和高DD时，对重金属的较高吸附发生。通过使用两个不同的等温线模型来分析平衡实验数据，即Langmuir和Freundlich。通过使用数学建模软件确定每个等温线的特征参数和相关的相关系数。等温物表明CD和Pb的吸附过程是异质过程。

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