期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133370
关键词
nano Zero-valent iron; Cyclodextrin polymer; Selectivity; P-Nitrophenol; Groundwater
资金
- National Key Research and Development Program of China [2019YFC1803803]
- National Natural Science Foundation of China [21976025]
- Key Research and Development Program of Liaoning [2019JH2/10300047]
- Science & Technology Innovation Fund of Dalian [2019J12SN73]
- Fundamental Research Funds for the Central Universities
Selective nano zero-valent iron composites have been developed for efficient removal of p-nitrophenol from water. The composites exhibit high selectivity, stability, and long-term performance.
Nano zero-valent iron (nZVI) materials usually have low selectivity in water toward target contaminants (e.g., p-nitrophenol) and nontarget water constituents (e.g., nitrates and dissolved organic matter-DOM). Here we pre -pared the selective nZVI entrapped in the matrix of cyclodextrin polymer (CDP), using in situ impregnation and aqueous KBH4 reduction of FeCl3 in the matrix of CDP. The nZVI-CDP composites feature the network structure of CDP with mainly 40-80 nm nZVI particles entrapped in the network and 300 nm iron particles coated on the network surface. nZVI entrapped displays high stability and selective CDP facilitates the access of p-nitrophenol to nZVI, both accounting for the high selectivity of the composites. Chemical degradation of the nZVI materials, combined with adsorption, contributed to the p-nitrophenol removal. The nZVI materials usually exhibited similar or higher p-nitrophenol removal at different levels of nitrates, DOM or sulfides. Column experiments showed that the nZVI materials completely decontaminated 63 column volumes of groundwater containing p- nitrophenol, 6-fold higher than mixed nZVI and CDP. The nZVI materials were estimated to have potential performance duration of averaging 109 d, indicating the long-term performance in groundwater.
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