Center of Excellence for Research in Engineering Materials (CEREM), Deanship of Scientific Research, King Saud University, Riyadh 11421, Saudi Arabia.
Center of Excellence for Research in Engineering Materials (CEREM), Deanship of Scientific Research, King Saud University, Riyadh 11421, Saudi Arabia.
Ecotoxicol Environ Saf. 2019 Mar;169:479-486. doi: 10.1016/j.ecoenv.2018.11.049. Epub 2018 Dec 4.
The nanofibers membranes were fabricated by poly(vinyl alcohol)/chitosan (PVA/Chi) using an electro-spun technique for selective and high adsorption of lead (Pb(II)) and cadmium (Cd(II)) ions based on the solution acidity. The PVA/Chi NFs membranes were characterized systematically using several instrumentations. In addition, several experimental parameters such as initial metal ions concentration, interaction time, adsorbent dosage, solution pH and the effects of competing ions on Pb(II) and Cd(II) adsorption were evaluated. The adsorption data were also clarified that the PVA/Chi NFs membranes were exhibited high kinetic performances towards the both toxic ions at the optimum conditions. The adsorption data were manipulated using different kinetics models, and it was confirmed that only pseudo-second-order model obeyed the adsorption kinetics for Pb(II) and Cd(II) ions. Similarly, the equilibrium data were well fitted with the Langmuir adsorption isotherms model, and the maximum adsorption capacity was 266.12 and 148.79 mg/g for Pb(II) and Cd(II) ions, respectively. The Pb(II) and Cd(II) ions adsorptions were also measured to know the selectivity with simulated environmental solution, and the data were confirmed the high selectivity to Pb(II) and Cd(II) ions at the optimum condition and the nanofibers membrane shown the potentiality for possible use in efficient removal of the selected toxic ions from waste samples. Thus, the PVA/Chi NFs are considered to be effective and promising materials for Pb(II) and Cd(II) ions from wastewaters with high efficiency.
采用静电纺丝技术，通过聚（聚乙烯醇）/壳聚糖（PVA/Chi）制备纳米纤维膜，基于溶液酸度对铅（Pb(II)）和镉（Cd(II)）离子进行选择性和高效吸附。使用多种仪器对 PVA/Chi NFs 膜进行了系统的表征。此外，还评估了初始金属离子浓度、相互作用时间、吸附剂用量、溶液 pH 值和竞争离子对 Pb(II)和 Cd(II)吸附的影响等几个实验参数。吸附数据还表明，在最佳条件下，PVA/Chi NFs 膜对两种有毒离子表现出高动力学性能。使用不同的动力学模型处理吸附数据，证实只有伪二级模型符合 Pb(II)和 Cd(II)离子的吸附动力学。同样，平衡数据也很好地符合 Langmuir 吸附等温线模型，Pb(II)和 Cd(II)离子的最大吸附容量分别为 266.12 和 148.79 mg/g。还测量了 Pb(II)和 Cd(II)离子的吸附以了解模拟环境溶液中的选择性，数据证实了在最佳条件下对 Pb(II)和 Cd(II)离子具有高选择性，并且纳米纤维膜显示出从废水中高效去除所选有毒离子的潜力。因此，PVA/Chi NFs 被认为是从废水中去除 Pb(II)和 Cd(II)离子的有效且有前途的材料，效率高。
