Ahmad Hilal, Alharbi Walaa, BinSharfan Ibtisam I, Khan Rais Ahmad, Alsalme Ali
Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam.
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam.
Polymers (Basel). 2020 Oct 15;12(10):2370. doi: 10.3390/polym12102370.
Cellulose nanofibers were covalently functionalized using diethylenetriamine penta (methylene phosphonic acid) and studied for the extraction of heavy metal ions. The surface-functionalized nanofibers showed a high adsorption capacity towards heavy metal ions as compared to bare nanofibers. The elemental composition and surface morphology of the prepared bio-adsorbent was characterized by X-ray photoelectron spectroscopy, attenuated total reflectance infrared spectroscopy, field emission scanning electron microscopy, and energy dispersive spectroscopy. The prepared material was studied to develop a column-based solid phase extraction method for the preconcentration of trace metal ions and their determination by inductively coupled plasma optical emission spectroscopy. The batch experimental data was well fitted to Langmuir adsorption isotherms (R > 0.99) and follows pseudo-second-order kinetics. The experimental variables such as sample pH, equilibrium time, column breakthrough, sorption flow rate, the effect of coexisting ions, and eluent type were systematically studied and optimized accordingly. The detection limit of the proposed method was found to be 0.03, 0.05, and 0.04 µg L for Cu(II), Pb(II), and Cd(II), respectively. Certified Reference Materials were analyzed to validate the proposed method against systematic and constant errors. At a 95% confidence level, the Student's t-test values were less than the critical Student's t value (4.302). The developed method was successfully employed for the preconcentration and determination of trace metal ions from real water samples such as river water and industrial effluent.
使用二乙烯三胺五（亚甲基膦酸）对纤维素纳米纤维进行共价功能化，并研究其对重金属离子的萃取性能。与未处理的纳米纤维相比，表面功能化的纳米纤维对重金属离子表现出较高的吸附容量。通过X射线光电子能谱、衰减全反射红外光谱、场发射扫描电子显微镜和能量色散光谱对制备的生物吸附剂的元素组成和表面形态进行了表征。对制备的材料进行了研究，以开发一种基于柱的固相萃取方法，用于痕量金属离子的预富集及其通过电感耦合等离子体发射光谱法进行测定。批量实验数据与朗缪尔吸附等温线拟合良好（R>0.99），并遵循准二级动力学。系统研究并优化了样品pH值、平衡时间、柱穿透、吸附流速、共存离子的影响和洗脱剂类型等实验变量。该方法对Cu（II）、Pb（II）和Cd（II）的检测限分别为0.03、0.05和0.04μg/L。分析了有证标准物质，以验证所提出的方法是否存在系统误差和恒定误差。在95%置信水平下，学生t检验值小于临界学生t值（4.302）。所开发的方法成功应用于对河水和工业废水等实际水样中痕量金属离子的预富集和测定。
