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首页> 外文期刊>Separation and Purification Technology >Kinetic and equilibrium modelling of lead(II) sorption from water and wastewater by polymerized banana stem in a batch reactor
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Kinetic and equilibrium modelling of lead(II) sorption from water and wastewater by polymerized banana stem in a batch reactor

机译：间歇式反应器中聚合香蕉杆吸附水和废水中铅（II）的动力学和平衡模型

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The aim of this research work was a kinetic and equilibrium study of the sorption of lead(II) ions from water and wastewater by formaldehyde polymerized banana stem containing sulphonic acid groups.The adsorbent was characterized using surface area analyzer,infrared spectroscopy and scanning electron microscopy measurements.The surface charge and the acid groups of the adsorbent were determined using potentiometric and acid-base titrations,respectively.Batch experiments were performed under kinetic and equilibrium conditions.The optimum pH range for the maximum removal of lead(II) was 5-9.The maximum adsorption of 98.5 and 89.9% took place for an initial concentration of 10 and 25 mg/1,respectively,at pH 6.0.The sorption process occurred in two stages: external mass transport occurred in the early stage and intraparticular diffusion occurred in the long-term stage.The diffusion coefficients,energies of activation and entropies of activation for both processes were calculated to determine the theoretical behaviour of the sorption process.In the external mass transfer process,the diffusion coefficient increases with increasing initial concentration while in the intraparticle diffusion process,the diffusion coefficient decreases with increasing initial concentration.The temperature dependence indicates the endothermic nature of adsorption process.The Langmuir,Freundlich and Redlich-Peterson isotherm models were tried to represent the equilibrium data of lead(II) adsorption.The data fitted very well to the Freundlich isotherm model in the studied concentration range of lead(II) adsorption.Quantitative removal of 10.0 mg/1 lead(II) in 50 ml of battery manufacturing wastewater by 125 mg of the adsorbent was observed at pH 6.0.The adsorbent was suitable for repeated use (for more than four cycles) without noticeable loss of capacity.
机译：这项研究的目的是动力学和平衡研究含磺酸基团的甲醛聚合香蕉茎对水和废水中铅（II）离子的吸附。使用表面积分析仪，红外光谱和扫描电子显微镜对吸附剂进行表征。分别使用电位滴定法和酸碱滴定法测定吸附剂的表面电荷和酸基。在动力学和平衡条件下进行分批实验。最大去除铅（II）的最佳pH范围为5- 9，在pH 6.0时，初始浓度分别为10和25 mg / 1时，最大吸附量分别为98.5％和89.9％。吸附过程分为两个阶段：早期发生外部传质，发生颗粒内扩散。计算了两个过程的扩散系数，活化能和活化熵，以确定在外部传质过程中，扩散系数随初始浓度的增加而增加，而在颗粒内扩散过程中，扩散系数随初始浓度的增加而减小。温度依赖性表明了吸附过程的吸热性质。尝试用Langmuir，Freundlich和Redlich-Peterson等温线模型来表示铅（II）吸附的平衡数据。这些数据非常适合研究的铅（II）吸附浓度范围内的Freundlich等温线模型。在pH值为6.0的条件下，在50 ml电池制造废水中含125 mg吸附剂中的10.0 mg / 1铅（II），该吸附剂适合重复使用（超过四个循环），而容量没有明显损失。

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