Environment & Sustainability Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, India.
Environ Technol. 2021 Feb;42(5):801-812. doi: 10.1080/09593330.2019.1645741. Epub 2019 Jul 29.
In this article, the biosorption of Holmium(III) from aqueous solution was carried out using both raw and acid-treated bark powder of as bio-sorbents and the results are being compared. Batch experiments were conducted by varying different reaction parameters such as metal concentration, biomass dosage, pH of the metal solution and contact time. The results showed that the acid-treated biomass exhibited higher percentage removal of the metal ion Ho(III) i.e. 93.44% than the untreated bark powder using two times lesser amount of treated bark powder than the untreated one. Kinetics, isotherm and thermodynamic studies of adsorption were carried out. Kinetics of the adsorption process follows the linear form of a pseudo-second-order model. The negative values of Gibbs free energy change (Δ ) indicate the spontaneity of the adsorption process and the positive value of enthalpy change (Δ ) suggests it as an endothermic process. Out of four isotherm models, the equilibrium data were well described by Langmuir adsorption isotherm conforming monolayer coverage. The results suggested that acid-treated bark powder of can be used as a cost-effective and efficient bio-adsorbent for the adsorption of Holmium(III).
本文使用 和 未处理的树皮粉作为生物吸附剂，对水溶液中的钬 (III) 进行了生物吸附，并对结果进行了比较。通过改变金属浓度、生物质用量、金属溶液 pH 值和接触时间等不同反应参数进行了批量实验。结果表明，酸处理后的生物质对金属离子 Ho(III) 的去除率更高，达到 93.44%，而使用的处理后生物质粉量仅为未处理的生物质粉的两倍。对吸附的动力学、等温线和热力学进行了研究。吸附过程的动力学遵循准二级模型的线性形式。吉布斯自由能变化 (Δ ) 的负值表明吸附过程是自发的，焓变 (Δ ) 的正值表明它是一个吸热过程。在四个等温线模型中，平衡数据很好地符合了 Langmuir 吸附等温线，表明单层覆盖。结果表明，酸处理后的 树皮粉可用作一种经济高效的生物吸附剂，用于吸附钬 (III)。
