Alharbi Nada K, Al-Zaban Mayasar I, Albarakaty Fawziah M, Abdelwahab Sayed F, Hassan Sedky H A, Fawzy Mustafa A
Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Department of Biology, Faculty of Applied Science, Umm Al-Qura University, P.O. Box 715, Makkah Al Mukarramah 21955, Saudi Arabia.
Life (Basel). 2022 Apr 14;12(4):585. doi: 10.3390/life12040585.
The aim of this study was to assess the efficiency of for removing Zn ions from the aqueous solutions. The optimized conditions of 4.48 g/L algal dose, pH of 6.62 and initial zinc concentration of 29.72 mg/L obtained by response surface methodology were employed for Zn biosorption by and up to 97.90% Zn was removed, showing that there is a favorable harmony between the experimental data and model predictions. Different kinetic and equilibrium models were used to characterize the biosorption manner of as a biosorbent. The kinetic manner of Zn biosorption was well characterized by the pseudo-second-order, implying that the adsorption process is chemical in nature. The Langmuir and Dubinin-Radushkevich isotherm models were best fit to the equilibrium data. The maximum adsorption capacity of the Langmuir monolayer was 50.7 mg/g. Furthermore, the thermodynamic analysis revealed that Zn biosorption was endothermic, spontaneous and feasible. As a result of biosorption process, FTIR, SEM, and EDX investigations indicated noticeable alterations in the algal biomass's properties. Therefore, the dried biomass has been shown to be cost-effective and efficient for removing the heavy metals, particularly zinc ions from wastewater, and the method is practicable, and environmentally acceptable.
本研究的目的是评估[具体内容未给出]从水溶液中去除锌离子的效率。采用响应面法获得的藻剂量为4.48 g/L、pH为6.62、初始锌浓度为29.72 mg/L的优化条件用于[具体内容未给出]对锌的生物吸附，锌的去除率高达97.90%，表明实验数据与模型预测之间存在良好的一致性。使用不同的动力学和平衡模型来表征[具体内容未给出]作为生物吸附剂的生物吸附方式。锌生物吸附的动力学方式通过准二级动力学得到很好的表征，这意味着吸附过程本质上是化学过程。Langmuir和Dubinin-Radushkevich等温线模型最适合平衡数据。Langmuir单层的最大吸附容量为50.7 mg/g。此外，热力学分析表明锌生物吸附是吸热的、自发的且可行的。生物吸附过程的结果表明，傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和能谱分析（EDX）研究表明藻类生物质的性质发生了明显变化。因此，已证明干燥的[具体内容未给出]生物质对于从废水中去除重金属，特别是锌离子具有成本效益且高效，该方法可行且环境可接受。
