材料科学
纳米复合材料
石墨烯
氧化物
膜
纳米材料
界面聚合
金属
纳米技术
化学工程
水溶液中的金属离子
复合材料
聚合物
冶金
单体
化学
工程类
生物化学
作者
Miaolu He,Lei Wang,Zhe Zhang,Yan Zhang,Jiwei Zhu,Xudong Wang,Yongtao Lv,Rui Miao
标识
DOI:10.1021/acsami.0c17405
摘要
A sulfonated graphene oxide@metal–organic framework-modified forward osmosis nanocomposite (SGO@UiO-66-TFN) membrane was developed to improve stability and heavy metal removal performance. An in situ growth method was applied to uniformly distribute UiO-66 nanomaterial with a frame structure on SGO nanosheets to form SGO@UiO-66 composite nanomaterial. This nanomaterial was then added to a polyamide layer using interfacial polymerization. The cross-linking between SGO@UiO-66 and m-phenylenediamine improved the stability of the nanomaterial in the membrane. Additionally, the water permeability was improved because of additional water channels introduced by SGO@UiO-66. SGO, with its lamellar structure, and UiO-66, with its frame structure, made the diffusion path of the solute more circuitous, which improved the heavy metal removal and salt rejection performances. Moreover, the hydrophilic layer of the SGO@UiO-66-TFN membrane could block contaminants and loosen the structure of the pollution layer, ensuring that the membrane maintained a high removal rate. The water flux and reverse solute flux of the SGO@UiO-66-TFN membrane reached 14.77 LMH and 2.95 gMH, and compared with the thin-film composite membrane, these values were increased by 41 and 64%, respectively. The membrane also demonstrated a good heavy metal ion removal performance. In 2 h, the heavy metal ion removal rate (2000 ppm Cu2+ and Pb2+) was greater than 99.4%, and in 10 h the removal rate was greater than 97.5%.
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