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首页> 外文期刊>International Journal of Water Resources and Environmental Engineering >Kinetic studies on the removal of some metal ions from aqueous solution using modified orange mesocarp extract
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Kinetic studies on the removal of some metal ions from aqueous solution using modified orange mesocarp extract

机译：改性橙皮果皮提取物去除水溶液中某些金属离子的动力学研究

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This study examines the kinetics of the removal of zinc, copper, nickel and cobalt ions from aqueous solutions by Carboxylated-Toluene Di-isocyanate Orange Mesocarp Extract Resin (CTOR) and Sulphonated-Toluene Di-isocyanate Orange Mesocarp Extract Resin (STOR). Results from contact time experiments indicate that the rate of ion exchange was initially rapid and equilibrium was attained within 40 to 45 min. It was found that the uptake of Zn2+, Cu2+, Ni2+and Co2+ions by CTOR and STOR is related to the dissociation power of the exchangeable hydrogen and in sequence similar to the ionic radii of the metal ions. The Vermeulen’s particle diffusion model best described the ion exchange process. The fraction attainment of equilibrium (α) values increase with time and reaching constant value at about 40 to 45 min for the resins, indicating the time for saturation of the active sites. The rate constants for CTOR and STOR decreased with increase in temperature from 29 to 70°C. The negative values of the activation energy calculated using the Arrhenius equation showed that low temperatures favoured the exchange process.
机译：这项研究研究了羧基化甲苯二异氰酸酯橙中果皮提取物树脂（CTOR）和磺化甲苯二异氰酸酯橙中果皮提取物树脂（STOR）从水溶液中去除锌，铜，镍和钴离子的动力学。接触时间实验的结果表明，离子交换速率最初很快，并且在40至45分钟内达到了平衡。发现CTOR和STOR对Zn 2+，Cu 2+，Ni 2+和Co 2+离子的吸收与可交换氢的离解能力有关，并且其顺序与金属离子的离子半径相似。 Vermeulen的粒子扩散模型最能描述离子交换过程。树脂达到平衡（α）值的分数随时间增加，并在约40至45分钟时达到恒定值，表明活性位点达到饱和的时间。 CTOR和STOR的速率常数随着温度从29升高到70°C而降低。使用Arrhenius方程计算得出的活化能的负值表明，低温有利于交换过程。

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