Gaur Bharti, Mittal Jyoti, Shah Syed Ansar Ali, Mittal Alok, Baker Richard T
Department of Chemistry, Maulana Azad National Institute of Technology, Bhopal 462 003, India.
Department of Chemistry, University of St. Andrews, Fife, St. Andrews KY16 9ST, UK.
Molecules. 2024 May 19;29(10):2387. doi: 10.3390/molecules29102387.
This study explores the detailed characterization of a biosorbent (Hen Feather) and its efficient use in eradicating the azo dye Metanil Yellow (MY) from its aqueous solutions. Effects of a range of experimental parameters, including pH, initial dye concentration, biosorbent dosage and contact time on the adsorption, were studied. A detailed physical and chemical characterization of the biosorbent was made using SEM, XRD, XPS and FTIR. During the optimization of adsorption parameters, the highest dye uptake of almost 99% was recorded at pH 2, dye concentration 2 × 10 M, 0.05 g of biosorbent and a contact period of 75 min. Various adsorption isotherm models were studied to gather different adsorption and thermodynamic parameters. The linearity of the Langmuir, Freundlich and D-R adsorption isotherms indicate homogeneous, multilayer chemisorption with high adsorption affinity between the dye and biosorbent. Values of the changes in the Gibbs free energy (ΔG°) and the enthalpy (ΔH°) of the adsorption process have been calculated, these values indicate that it is a spontaneous and endothermic process. Kinetics of the adsorption were also measured, and it was established that the adsorption of MY over Hen Feather follows a pseudo-second-order kinetic model at temperatures 30, 40 and 50 °C. The findings of this investigation clearly indicate that the studied biosorbent exhibits a high affinity towards the dye (MY), and it can be effectively, economically and efficiently used to sequestrate and eradicate MY from its aqueous solutions.
本研究探讨了一种生物吸附剂（鸡毛）的详细特性及其在从水溶液中去除偶氮染料酸性金黄（MY）方面的有效应用。研究了一系列实验参数，包括pH值、初始染料浓度、生物吸附剂用量和接触时间对吸附的影响。使用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）和傅里叶变换红外光谱仪（FTIR）对生物吸附剂进行了详细的物理和化学表征。在吸附参数优化过程中，在pH值为2、染料浓度为2×10⁻⁵M、生物吸附剂用量为0.05 g和接触时间为75分钟的条件下，记录到最高染料去除率近99%。研究了各种吸附等温线模型，以获取不同的吸附和热力学参数。朗缪尔、弗伦德里希和杜宾-拉杜舍维奇吸附等温线的线性表明，染料与生物吸附剂之间存在均匀的多层化学吸附，且具有高吸附亲和力。计算了吸附过程的吉布斯自由能变化（ΔG°）和焓变（ΔH°）值，这些值表明该过程是一个自发的吸热过程。还测定了吸附动力学，结果表明，在30、40和50℃下，鸡毛对酸性金黄的吸附遵循准二级动力学模型。本研究结果清楚地表明，所研究的生物吸附剂对染料（酸性金黄）具有高亲和力，并且可以有效、经济和高效地用于从水溶液中螯合和去除酸性金黄。
