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Kinetic, Isotherm And Equilibrium Study Of Adsorption Of Hydrogen Sulfide From Wastewater Using Modified Eggshells

机译：修饰蛋壳吸附废水中硫化氢的动力学，等温线和平衡研究

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摘要

The studies of adsorption equilibrium isotherm and kinetics of hydrogen sulfide-water systems on calcite-based adsorbents prepared from eggshell are undertaken. The effects of operating variables such as contact time and initial concentration on the adsorption capacity of hydrogen sulfide are investigated. The modified eggshells are characterized by using different analytical approaches such as Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR). The batch mode adsorption process is performed at optimum removal conditions: dosage of 1 g/L, pH level of pH 6, agitation speed of 150 rpm and contact time of 14h for adsorbing hydrogen sulfide with an initial concentration of 100-500 mg/L. In the current study, the Langmuir, Freundlich, Temkin, and Dubinin models are used to predict the adsorption isotherms. Our equilibrium data for hydrogen sulfide adsorption agrees well with those of the Langmuir equation. The maximum monolayer adsorption capacity is 150.07 mg/g. Moreover, the kinetics of H2S adsorption by using the modified calcite of eggshell follows a pseudo-second-order model. From the current work, we have found that the calcite eggshell is a suitable adsorbent for H2S embeded inside the waste water. Most importantly, chicken eggshell is a waste and vastly available; hence, it could serve as a practical mean for H2S adsorption.
机译：研究了蛋壳制方解石基吸附剂的吸附平衡等温线和硫化氢-水体系的动力学。研究了接触时间和初始浓度等操作变量对硫化氢吸附容量的影响。改进的蛋壳的特征在于使用了不同的分析方法，例如扫描电子显微镜（SEM）和傅立叶变换红外（FTIR）。间歇模式吸附过程在最佳去除条件下进行：剂量为1 g / L，pH值为6，搅拌速度为150 rpm，接触时间为14h，用于吸附初始浓度为100-500 mg / L的硫化氢。 。在当前的研究中，Langmuir，Freundlich，Temkin和Dubinin模型用于预测吸附等温线。我们关于硫化氢吸附的平衡数据与Langmuir方程的数据非常吻合。最大单层吸附容量为150.07 mg / g。此外，使用改进的蛋壳方解石吸附H2S的动力学遵循伪二级模型。从目前的工作中，我们发现方解石蛋壳是嵌入废水中的硫化氢的合适吸附剂。最重要的是，鸡的蛋壳是一种浪费，可以大量使用。因此，它可以作为H2S吸附的实用手段。

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