ABSTRACT

This work presents low-cost sorbent powder obtained from agro-waste of poultry eggshells for the adsorption of contaminants and was elucidated with transmission electron microscopy, Fourier transform infrared, scanning electron microscope, X-ray diffraction and N₂ adsorption–desorption techniques. It was observed that a solution pH of 2.0 and 5.0 was enough for the maximum uptake of reactive yellow 145 dye (RY 145) and Cu(II) ions, respectively, which showed that the pollutants removal was affected by the pH of solution. Langmuir monolayer adsorption capacity was found to be 101.500 mg/g for Cu(II) and 88.450 mg/g for reactive yellow 145 dye, respectively. Redlich–Peterson and Sips models both fitted well with the adsorption data. The Pseudo-second-order equation demonstrated good relationship with the experimental data and thus explained the adsorption mechanism to be chemisorption. Values of different thermodynamic considerations gave the values of ΔH° and ΔS° to be 30452.020, 27194.180 and 100.930, 90.370 kJmol⁻¹ for Cu(II) and RY 145 dye, respectively. Findings from this current study revealed that the prepared sorbent from agro-waste of eggshell can be a useful material for the elimination of Cu(II) and RY 145 dye in aqueous solutions.

摘要

这项工作介绍了从禽蛋壳的农业废物中获得的低成本吸附剂粉末，用于吸附污染物，并通过透射电子显微镜，傅立叶变换红外光谱仪，扫描电子显微镜，X射线衍射和N ₂进行了阐明。吸附-解吸技术。观察到溶液的pH值为2.0和5.0足以分别分别吸收最大的活性黄145染料（RY 145）和Cu（II）离子，这表明污染物的去除受到溶液pH的影响。发现Langmuir单层对Cu（II）的吸附容量为101.500 mg / g，对活性黄145染料的吸附容量为88.450 mg / g。Redlich-Peterson和Sips模型都很好地拟合了吸附数据。伪二级方程与实验数据显示出良好的关系，从而解释了吸附机理为化学吸附。不同热力学考虑的值给出的ΔH °和ΔS °值为30452.020、27194.180和100.930、90.370 kJmol ^-1分别用于Cu（II）和RY 145染料。这项当前研究的发现表明，由蛋壳的农业废料制备的吸附剂可以作为消除水溶液中的Cu（II）和RY 145染料的有用材料。