Removal Research of Selenite in Wastewater with the Ferrous Hydroxyl Complex(FHC)†

doi:10.7503/cjcu20160435

Abstract

Abstract:

Se(Ⅳ) and Se(Ⅵ) were found in treatment of industrial wastewater, especially toxicity and highly radioactivity of Se(Ⅳ) are seriously hazardous to the natural environment. The ferrous hydroxyl complex(FHC), structural Fe(Ⅱ), was synthesized by precipitation method, and for the treatment of industrial wastewater containing selenite were investigated by FHC. The results showed that Se(Ⅳ) removal rate was 40% by FHC when pH value was 8. Se(Ⅳ) removal rate were 80%, 90%, 53% by FHC when pH values were 6.5, 8, 9.5, respectiverly, and Cu(Ⅱ) concentration was 0.5 mmol/L. In other conditions being the same, Se(Ⅳ) removal rate was 93%, 99%, 98% when Ag(Ⅰ) concentration was 0.3 mmol/L. However, in the pH value of 8, Se(Ⅳ) removal rate was 30%, 24% and 21% when nitrite concentration was 0.2, 2 and 20 mmol/L. This result showed that the nitrite has an obviously inhibition in Se(Ⅳ) removal. The samples were characterized via X-ray photoelectron spectroscopy(XPS) and X-ray diffraction(XRD), which indicated silver ions converted into elemental silver, copper ions were reduced into cuprous oxide, selenite were fixed onto the structure state ferrous surface and reduced for oxidation state of selenium. By sequential extraction procedure, analysis on selenium in sediments has been found that selenide and element Se was the main reduction product, which indicated the reduction immobilization was mainly selenite removal envelope. Owing to FHC strong coagulation and reduction ability, it should be of practically potential for treatment of industrial waste water.

Key words: Structure state ferrous hydroxyl complex, Selenite, Metal ion, Nitrite, Sequential extraction

CLC Number:

TrendMD:

FU Mao, WU Deli, ZHANG Yalei, ZHANG Yong. Removal Research of Selenite in Wastewater with the Ferrous Hydroxyl Complex(FHC)^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2221.

Figures/Tables 8

Fig.1 Effect of nitrite on FHC reacted with Se(Ⅳ)Initial [Se(Ⅳ)]=20 mg/L; FHC dosage=35 mg/L; pH=8; ion concentrations of nitrite was 0.2, 2.0 and 20.0 mmol/L; t=1 h.

Fig.2 Effects of pH values and different concentrations of Ag(Ⅰ) on FHC reacted with Se(Ⅳ)Initial [Se(Ⅳ)]=20 mg/L; FHC dosage=35 mg/L; pH=6.5, 8, 9.5; ion concentrations of Ag(Ⅰ) was 0.03, 0.1 and 0.3 mmol/L; t=1 h.

Fig.3 Effects of pH values or different concentrations of Cu(Ⅱ) on FHC reacted with Se(Ⅳ) Initial [Se(Ⅳ)]=20 mg/L; FHC dosage=35 mg/L;pH=6.5, 8, 9.5; ion concentrations of Cu(Ⅱ) was 0.1, 0.5 and 1 mmol/L; t=1 h.

Fig.4 Ag3d3 XPS survey spectrum(A) and XPS spectrum(B) of FHC reacted with Se(Ⅳ) in the presence of Ag(Ⅰ)

Fig.5 XPS survery spectrum(A) and Cu3p XPS spectra(B, C) of FHC reacted with Se(Ⅳ) in the presence of Cu(Ⅱ)

Fig.6 XRD patterns of FHC reacted with Se(Ⅳ) in the presence of Ag(Ⅰ)(A) and Cu(Ⅱ)(B)

Fig.7 XPS spectra of FHC reacted with Se(Ⅳ)(A) Blank; (B) FHC(1∶1); (C) FHC+Se+NO2-; (D) FHC+Se+Cu2+; (E) FHC+Se+Ag+.

Fig.8 Result of sequential extraction of selenium

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