Radiation induced environmental remediation of Cr(VI) heavy metal in aerated neutral solution under simulated industrial effluent
-
Fathi Djouider
and
Mohammed S. Aljohani
Abstract
Cr(VI) compounds are major water contaminants in most industrial effluents, due to their carcinogenicity, while Cr(III) is an important element for human metabolism. In a previous work, we showed that Cr(VI) was radiolytically reduced to Cr(III) by the CO2ˉ• radical at pH 3 N2O-saturated solution in the presence of formate. Here in the present work, this removal was investigated by steady state irradiation and pulse radiolysis in aerated solution at neutral pH, which is close to natural conditions in most wastewaters, where the reducing agent is the superoxide radical anion O2ˉ•. The degradation of Cr(VI) increased linearly with the absorbed dose and was significantly enhanced by the added formate but not by the radiolitically produced hydrogen peroxide at this pH. The rate constant for this reduction was found to be 1.28×108 M−1 s−1 and the absorption spectrum of Cr(V) transient species was obtained. A partial recovery of Cr(VI) is observed over a period of ca. 5 ms following a second order kinetics with a rate constant 8.0×106 M−1 s−1. These outcomes suggest that gamma-irradiation of Cr(VI)-contaminated wastewaters and industrial effluents in presence of formate can be simple, effective and economical means for the remediation of this major contaminant.
Funding: Partial financial assistance from the Nuclear Engineering Department of King Abdulaziz University is gratefully acknowledged.
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Articles in the same Issue
- Frontmatter
- Cross section measurements of 75As(α,xn)76,77,78Br and 75As(α,x)74As nuclear reactions using the monitor radionuclides 67Ga and 66Ga for beam evaluation
- U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane
- Preparation, characterization, uranium (VI) biosorption models, and conditions optimization by response surface methodology (RSM) for amidoxime-functionalized marine fungus materials
- β-Zeolite modified by ethylenediamine for sorption of Th(IV)
- Assessment of surface reactivity of thorium oxide in conditions close to chemical equilibrium by isotope exchange 229Th/232Th method
- Evolution of heavy ions (He2+, H+) radiolytic yield of molecular hydrogen vs. “Track-Segment” LET values
- Radiation induced environmental remediation of Cr(VI) heavy metal in aerated neutral solution under simulated industrial effluent
- Soil depth profiles and radiological assessment of natural radionuclides in forest ecosystem
Articles in the same Issue
- Frontmatter
- Cross section measurements of 75As(α,xn)76,77,78Br and 75As(α,x)74As nuclear reactions using the monitor radionuclides 67Ga and 66Ga for beam evaluation
- U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane
- Preparation, characterization, uranium (VI) biosorption models, and conditions optimization by response surface methodology (RSM) for amidoxime-functionalized marine fungus materials
- β-Zeolite modified by ethylenediamine for sorption of Th(IV)
- Assessment of surface reactivity of thorium oxide in conditions close to chemical equilibrium by isotope exchange 229Th/232Th method
- Evolution of heavy ions (He2+, H+) radiolytic yield of molecular hydrogen vs. “Track-Segment” LET values
- Radiation induced environmental remediation of Cr(VI) heavy metal in aerated neutral solution under simulated industrial effluent
- Soil depth profiles and radiological assessment of natural radionuclides in forest ecosystem
