Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1821-1830.doi: 10.13278/j.cnki.jjuese.20180029

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Removal Effect and Influencing Factors of Cr(Ⅵ) in Simulated Groundwater by Sulfidated Nanoscale Zerovalent Iron

Hong Mei1,2, Han Xu1,2, Wang Qiang3, Liu Lu1,2, Shi Yuxi1,2   

  1. 1. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    2. Key Laboratory of Groundwater Resources and Environment(Jilin University), Ministry of Education, Changchun 130021, China;
    3. Bureau of Hydrology Songliao River Water Resources Commission, Changchun 130021, China
  • Received:2018-02-05 Published:2018-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41530636) and Science and Technology Development Plan of Jilin Province (20150204045SF)

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Abstract: Sulfidated nanoscale zerovalent iron (S-nZVI) is a new nZVI modified material with core-shell structure, and exhibits a higher reactivity towards various contaminants than nZVI. In this study, S-nZVI was synthesized by a two-step method. S-nZVI and nZVI were investigated by transmission electron microscope-energy dispersive X-ray spectroscopy (TEM-EDX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The effects of n(S)/n(Fe), initial pH, reagent dosage and groundwater chemical composition on Cr(Ⅵ) removal by nZVI and S-nZVI were evaluated. The results showed that S-nZVI has obvious core-shell structure, and the core of Fe0 is coated with amorphous ferrous sulfide and polysulfide. The optimum n(S)/n(Fe) was 0.14 for the reaction between S-nZVI and Cr(Ⅵ). The increased dosage of S-nZVI enhanced Cr(Ⅵ) removal efficiency. With the same dosage, the Cr (VI) removal efficiency by S-nZVI was significantly higher than that by nZVI. When pH increased, the Cr(Ⅵ) removal efficiency by both S-nZVI and nZVI decreased gradually. But the efficiency and removal rate by S-nZVI were always higher than by nZVI under the same pH. Especially at pH=5, S-nZVI removed 100% of Cr(Ⅵ), whereas nZVI removed 85%. K+, Na+, Ca2+, Mg2+, SO42-, NO3-, and Cl- promoted Cr(Ⅵ) removal by both S-nZVI and nZVI, but more effectively in S-nZVI system. The presence of HCO3- increased the solution pH, and thus inhibited Cr(Ⅵ) removal more stronger in nZVI than S-nZVI systems. S-nZVI shows a higher efficiency of Cr(Ⅵ) removal than nZVI under the influence of various pH and groundwater chemical components, so it has a broader application prospect.

Key words: Cr(Ⅵ), S-nZVI, n(S)/n(Fe), pH, chemical composition of ground water

CLC Number: 

  • X523
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