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首页> 外文期刊>Applied Surface Science >Kinetics And Thermodynamics Of Pb(ii) Adsorption Onto Modified Spent Grain From Aqueous Solutions
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Kinetics And Thermodynamics Of Pb(ii) Adsorption Onto Modified Spent Grain From Aqueous Solutions

机译：水溶液中Pb（ii）吸附到改性废粒上的动力学和热力学

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Spent grain, a main by-product of the brewing industry, is available in large quantities, but its main application has been limited to animal feeding. Nevertheless, in this study, spent grain modified with 1 M NaCl solution as a novel adsorbent has been used for the adsorption of Pb(II) in aqueous solutions. Isotherms, kinetics and thermodynamics of Pb(II) adsorption onto modified spent grain were studied. The equilibrium data were well fitted with Langmuir, Freundlich and Dubinin-Radushkevick (D-R) isotherm models. The kinetics of Pb(II) adsorption followed pseudo-second-order model, using the rate constants of pseudo-second-order model, the activation energy (E_a) of Pb(II) adsorption was determined as 12.33 kj mol~(-1) according to the Arrhenius equation. Various thermodynamic parameters such as △G~(ads), △H~(ads) and △S~(ads) were also calculated. Thermodynamic results indicate that Pb(II) adsorption onto modified spent grain is a spontaneous and endothermic process. Therefore, it can be concluded that modified spent grain as a new effective adsorbent has potential for Pb(II) removal from aqueous solutions.
机译：啤酒工业的主要副产品废谷物可以大量使用，但其主要用途仅限于动物饲养。但是，在这项研究中，用1 M NaCl溶液改性的废谷物作为新型吸附剂已用于水溶液中Pb（II）的吸附。研究了改性废谷物吸附Pb（II）的等温线，动力学和热力学。平衡数据与Langmuir，Freundlich和Dubinin-Radushkevick（D-R）等温线模型非常吻合。 Pb（II）的吸附动力学遵循伪二级模型，利用伪二级模型的速率常数，确定了Pb（II）吸附的活化能（E_a）为12.33 kj mol〜（-1 ）根据Arrhenius方程。还计算了各种热力学参数，如△G〜（ads），△H〜（ads）和△S〜（ads）。热力学结果表明，Pb（II）吸附到改性废谷物上是一个自发的吸热过程。因此，可以得出结论，改性废谷物作为一种新型有效吸附剂具有从水溶液中去除Pb（II）的潜力。

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