Rational Design of Antifouling Polymeric Nanocomposite for Sustainable Fluoride Removal from NOM-Rich Water.
Rational Design of Antifouling Polymeric Nanocomposite for Sustainable Fluoride Removal from NOM-Rich Water.
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DOI：
10.1021/acs.est.7b04164
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发表时间：
2017-11
影响因子：
11.4
通讯作者：
Xiaolin Zhang;Lu-yong Zhang;Zhixian Li;Zhao Jiang;Q. Zheng;Bin Lin;B. Pan
中科院分区：
文献类型：
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作者：
Xiaolin Zhang;Lu-yong Zhang;Zhixian Li;Zhao Jiang;Q. Zheng;Bin Lin;B. Pan
天然有机物（NOM）的存在对吸附去除水中包括氟化物在内的各种污染物产生不利影响。在此，我们设计了一种新型的纳米复合吸附剂，用于从富含NOM的水中更好地和可持续地去除氟。纳米复合材料（HZO@HCA）通过将水合氧化锆纳米颗粒（HZO NPs）封装在结合叔胺基团的超交联聚苯乙烯阴离子交换剂（HCA）内而获得。另一种可商购的纳米复合材料HZO@D201，具有结合铵基团的交联聚苯乙烯阴离子交换剂（D201）的主体，用于比较。HZO@HCA具有丰富的微孔，而不是HZO@D201的中孔/大孔，导致NOM由于尺寸排阻而无法到达。此外，HCA的叔胺基团有利于轻微负载的NOM从HZO@HCA的有效解吸。正如预期的那样，Sigma-Aldrich腐殖酸即使在20 mg DOC/L下也没有对HZO@HCA的氟化物螯合产生任何可观察到的影响，而对HZO@D201观察到显著的抑制作用。循环吸附运行进一步验证了HZO@HCA用于从富含NOM的水中脱氟的上级可重复使用性。此外，HZO@HCA柱可以从合成的含氟地下水中产生1080床体积（BV）的流出物，以满足饮用水标准（<1.5 mg F/L），而HCA和HZO@D201柱分别只能产生<5和1040 BV的流出物。该研究为合理设计纳米复合材料修复水体提供了新的思路。
The presence of natural organic matter (NOM) exerts adverse effects on adsorptive removal of various pollutants including fluoride from water. Herein, we designed a novel nanocomposite adsorbent for preferable and sustainable defluoridation from NOM-rich water. The nanocomposite (HZO@HCA) is obtained by encapsulating hydrous zirconium oxide nanoparticles (HZO NPs) inside hyper-cross-linked polystyrene anion exchanger (HCA) binding tertiary amine groups. Another commercially available nanocomposite HZO@D201, with the host of a cross-linked polystyrene anion exchanger (D201) binding ammonium groups, was involved for comparison. HZO@HCA features with abundant micropores instead of meso-/macropores of HZO@D201, resulting in the inaccessible sites for NOM due to the size exclusion. Also, the tertiary amine groups of HCA favor an efficient desorption of the slightly loaded NOM from HZO@HCA. As expected, Sigma-Aldrich humic acid even at 20 mg of DOC/L did not exert any observable effect on fluoride sequestration by HZO@HCA, whereas a significant inhibition was observed for HZO@D201. Cyclic adsorption runs further verified the superior reusability of HZO@HCA for defluoridation from NOM-rich water. In addition, the HZO@HCA column could generate ∼80 bed volume (BV) effluent from a synthetic fluoride-containing groundwater to meet the drinking water standard (<1.5 mg F/L), whereas HCA and HZO@D201 columns could only generate <5 and ∼40 BV effluents, respectively. This study is believed to shed new light on how to rationally design antifouling nanocomposites for water remediation.