Nanocellulose-Block Copolymer Films for the Removal of Emerging Organic Contaminants from Aqueous Solutions
Nanocellulose-Block Copolymer Films for the Removal of Emerging Organic Contaminants from Aqueous Solutions
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DOI：
10.3390/ma12020230
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发表时间：
2019-01-02
期刊：
影响因子：
3.4
通讯作者：
Nicolau, Eduardo
中科院分区：
文献类型：
--
作者：
Herrera-Morales, Jairo;Turley, Taylor A.;Nicolau, Eduardo
地下水和地表水中新兴有机污染物（EOC）的普遍存在引发了对更有效的方法来去除环境中EOC的研究。为了解决这一环境问题，本文提出了基于纤维素纳米纤维（CNFs）和嵌段共聚物聚（4-乙烯基吡啶-b-环氧乙烷）（P4 VP-PEO）的可重复使用的膜的开发，以吸附作为EOC模型化合物的磺胺甲恶唑（SMX）。我们推测SMX的吸附主要是通过嵌段共聚物的吡啶官能团和SMX的缺电子苯基之间的相互作用来实现的。在制备薄膜之前，用烷氧基硅烷三甲氧基（2-苯乙基）硅烷（TMPES）对CNF进行改性，以增加其在水溶液中的稳定性。在添加P4 VP-PEO之后，通过过滤接着烘箱干燥来完成该过程。XPS和FTIR分别用于确认TMPES和P4 VP-PEO的加入。在中性pH的SMX水溶液中进行吸附批次实验，在60 min的中等时间内获得高达0.014 mmol/g的吸附。对于可重复使用性测试，将膜浸入95 wt.%的乙醇中以洗脱吸附的SMX，用去离子（DI）水冲洗，并在室温下干燥以在新的吸附循环中重复使用。我们发现这种新的复合材料可以重复使用多次，吸附能力的损失可以忽略不计。所提出的膜已被证明是水修复的实质性的重要性，因为它们发现在缺电子芳香族化合物的吸附中的直接应用，并且是可重复使用的。
The prevalence of emerging organic contaminants (EOCs) in ground and surface water has sparked the search for more effective methods to remove EOCs from the environment. In pursuit of a solution for this environmental concern, herein we present the development of reusable films based on cellulose nanofibers (CNFs) and the block copolymer, poly(4-vinylpyridine-b-ethylene oxide) (P4VP-PEO) to adsorb sulfamethoxazole (SMX) as an EOC model compound. We hypothesize that the adsorption of SMX was achieved mainly by - interactions between the pyridine functionalities of the block copolymer and the electron deficient phenyl group of the SMX. Preceding preparation of the films, CNFs were modified with the alkoxysilane trimethoxy(2-phenylethyl)silane (TMPES) to increase their stability in aqueous solution. After the addition of P4VP-PEO, the process was completed by filtration followed by oven-drying. XPS and FTIR were employed to confirm the addition of TMPES and P4VP-PEO, respectively. Adsorption batch experiments were performed in aqueous solutions of SMX at a neutral pH, obtaining adsorptions of up to 0.014 mmol/g in a moderate time of 60 min. For the reusability tests, films were immersed in ethanol 95 wt.% to elude the adsorbed SMX, rinsed with deionized (DI) water, and dried at room temperature to be reused in a new adsorption cycle. We found that this new composite material could be reused several times with negligible loss of adsorption capacity. The films presented have been shown to be of substantial importance for water remediation as they find direct application in the adsorption of electron deficient aromatic compounds and are reusable.