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首页> 外文期刊>Polymers research journal >Effect of Temperature on Equilibrium Adsorption of FE(II) by Chitosan: Determination of Thermodynamic Parameters
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Effect of Temperature on Equilibrium Adsorption of FE(II) by Chitosan: Determination of Thermodynamic Parameters

机译：温度对壳聚糖对FE（II）平衡吸附的影响：热力学参数的确定

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In this study removal of Fe(II) by chitosan adsorbent was experimentally investigated in a batch system. The adsorbent dose and pH of the metal solution was fixed at 0.15 g and 4, respectively. Equilibrium and thermodynamic studies were performed at three different temperatures. Langmuir-Freundlich isotherm model were well fitted to the experimental data. According to Langmuir-Freundlich parameters, maximum uptake capacity of Fe(II) reduced from 80.27 to 41.74 mg/g while temperature increased from 20 °C to 40 °C. It was observed that the metal uptake capacity decreased with the increase in temperature which shows the exothermic nature of the process. The exothermic nature of Fe(II) adsorption on chitosan adsorbent was also confirmed by the calculated negative value of enthalpy change. Standard Gibbs free energy change was calculated using Langmuir equilibrium constant. The negative value of ΔG° shows the adsorption of Fe(II) on chitosan is spontaneous.
机译：在这项研究中，在间歇系统中对脱乙酰壳多糖吸附剂对Fe（II）的去除进行了实验研究。金属溶液的吸附剂量和pH分别固定为0.15g和4。在三个不同的温度下进行平衡和热力学研究。 Langmuir-Freundlich等温线模型很好地拟合了实验数据。根据Langmuir-Freundlich参数，Fe（II）的最大吸收容量从80.27降低至41.74 mg / g，而温度从20°C升高至40°C。观察到，金属的吸收能力随温度的升高而降低，这表明该过程是放热的。 Fe（II）在壳聚糖吸附剂上的放热性质也由计算出的焓变负值证实。使用Langmuir平衡常数计算标准吉布斯自由能变化。 ΔG°的负值表明Fe（II）在壳聚糖上的吸附是自发的。

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