Functionalized paper-A readily accessible adsorbent for removal of dissolved heavy metal salts and nanoparticles from water
Functionalized paper-A readily accessible adsorbent for removal of dissolved heavy metal salts and nanoparticles from water
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DOI：
10.1016/j.jhazmat.2015.09.046
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发表时间：
2016-01-25
影响因子：
13.6
通讯作者：
Valiyaveettil, Suresh
中科院分区：
文献类型：
--
作者：
Setyono, Daisy;Valiyaveettil, Suresh
纸是一种容易获得的可再生资源，由交织的纤维素纤维组成，其可以被功能化以开发用于水净化的有趣的低成本吸附材料。在这项研究中，聚乙烯亚胺（PEI）功能化纸用于去除有害污染物，如Au和Ag纳米粒子，Cr（VI）阴离子，Ni 2+，Cd 2+，Cu 2+阳离子从加标水样。与未处理的纸相比，PEI涂布纸对本研究中所研究的污染物的吸附能力显示出显着的改善。通过动力学、等温模型、pH和脱附研究来研究污染物在吸附剂表面的吸附机理。污染物的吸附符合准二级动力学和Langmuir吸附等温式。阴离子污染物在pH 5时达到最大吸附，而阳离子在pH>6时达到最大吸附。总体而言，PEI官能化的纸显示出对重金属离子如Cr（VI）（68 mg/g）、Ni 2+（100 mg/g）和Ni（100 mg/g）的令人感兴趣的Langmuir吸附容量。（208 mg/g），Cd2+（370 mg/g）和Cu 2 +此外，改性纸还用于去除柠檬酸银（79 mg/g）、Ag-PVP（46 mg/g）、柠檬酸金（30 mg/g）、Au-PVP（17 mg/g）纳米颗粒。NP从吸附剂的解吸通过用2 M HCl或硫脲溶液洗涤来完成，而重金属离子使用IM NaOH或HNO 3溶液解吸。改性后的纸保留其提取效率解吸污染物。(C)2015爱思唯尔B. V.保留所有权利。
Paper, a readily available renewable resource, comprises of interwoven cellulosic fibers, which can be functionalized to develop interesting low-cost adsorbent material for water purification. In this study, polyethyleneimine (PEI)-functionalized paper was used for the removal of hazardous pollutants such as Au and Ag nanoparticles, Cr(VI) anions, Ni2+, Cd2+, and Cu2+ cations from spiked water samples. Compared to untreated paper, the PEI-coated paper showed significant improvement in adsorption capacities toward the pollutants investigated in this study. Kinetics, isotherm models, pH, and desorption studies were carried out to study the adsorption mechanism of pollutants on the adsorbent surface. Adsorption of pollutants was better described by pseudo-second order kinetics and Langmuir isotherm model. Maximum adsorption of anionic pollutants was achieved at pH 5 while that of cations was at pH>6. Overall, the PEI-functionalized paper showed interesting Langmuir adsorption capacities for heavy metal ions such as Cr(VI) (68 mg/g), Ni2+ (208 mg/g), Cd2+ (370 mg/g), and Cu2+ (435 mg/g) ions at neutral pH. In addition, the modified paper was also used to remove Ag-citrate (79 mg/g), Ag-PVP (46 mg/g), Au-citrate (30 mg/g), Au-PVP (17 mg/g) nanoparticles from water. Desorption of NPs from the adsorbent was done by washing with 2 M HCl or thiourea solution, while heavy metal ions were desorbed using 1 M NaOH or HNO3 solution. The modified paper retained its extraction efficiencies upon desorption of pollutants. (C) 2015 Elsevier B.V. All rights reserved.