期刊
JOURNAL OF CLEANER PRODUCTION
卷 211, 期 -, 页码 1250-1258出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2018.11.254
关键词
Lead ion removal; Iron oxide nanomaterials; Cobalt doping; Freundlich model
资金
- National Key Research and Development Program of China [2017YFA0207003]
- National Natural Science Foundation of China [21475134, 21775042]
- Fundamental Research Funds for the Central Universities [2016ZZD06]
Wastewater containing heavy metal ions such as lead should be treated for cleanup before discharge to environment. This work reports new nanomaterials of orthohexagonal iron oxide for efficient removal of lead (II), which were doped with cobalt (Co-Fe2O3) or Nickel (Ni-Fe2O3) ions through a simple method. The structure of adsorbents and adsorption mechanism were investigated by scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometer, Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy and so on. The results showed that the concentration of nitrate concentration has a tiny effect on the Pb(II) adsorption and the kinetic adsorption experiments showed that Co-Fe2O3 and Ni-Fe2O3 took less time to achieve the equilibrium state than Fe2O3 without doping And the isotherm batch experiments showed that Langmuir model matched well with the data of Fe2O3, Freundlich model fitted well in Co Fe2O3 and Ni Fe2O3 experiments data, indicating that cobalt/ nickel doping changes the adsorption mechanism. XPS analysis showed that the hydroxyl at surface played an important role in Pb(II) removal and the hydrogen bond was replaced by metal-oxygen bond. Furthermore, the adsorption capacities of, Co Fe2O3 and Ni Fe2O3 for Pb(II) removal were 136.0 mg/g and 97.5 mg/g respectively, which were superior to pristine Fe2O3 (93.9 mg/g). This study clearly showed that Co-Fe2O3 and Ni-Fe2O3 are promising candidates for lead ion removal in aqueous solution. (C) 2018 Published by Elsevier Ltd.
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