A study of the removal of selenite and selenate from aqueous solutions using a magnetic iron/manganese oxide nanomaterial and ICP-MS |
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| Affiliation: | 1. Department of Chemistry, The University of Texas at El Paso, 500 W University Ave., El Paso TX 79968, United States;2. Department of Environmental Science and Engineering PhD program, The University of Texas at El Paso, 500 W University Ave., El Paso TX 79968, United States;3. Department of Chemistry, The University of Texas-Pan American, 1201 W University Drive, Edinburg TX 78534, United States;1. College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China;2. Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;1. Department of Environmental Engineering, College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, Hubei, China;2. Department of Biological & Agricultural Engineering, TX A&M University, College Station, TX 77843, USA;3. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area in Hubei, China Three Gorges University, Yichang 443002, Hubei, China;4. College of Resources and Environment, Northwest A&F University of China, Yangling, Shaanxi 712100, China;1. Department of Environmental Engineering, College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China;2. Department of Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA;3. College of Resources and Environment, Northwest A&F University of China, Yangling 712100, China;1. Yale University, Department of Chemical and Environmental Engineering, Mason Lab, 9 Hillhouse Ave, New Haven, CT 06511, United States;2. University of Connecticut, Department of Civil and Environmental Engineering, Castleman Building, 261 Glenbrook Road, Storrs, CT 06269, United States;3. Northeastern University, Department of Civil and Environmental Engineering, Snell Engineering Center, 360 Huntington Avenue, Boston, MA 02115, United States;4. Yale University, School of Forestry and Environmental Studies, Kroon Hall, 195 Prospect St. New Haven, CT 06511, United States;1. State Key Laboratory of Pollution Control and Resource Reuse, PR China;2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;3. School of the Environment, Nanjing University, Nanjing, Jiangsu 210023, PR China |
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| Abstract: | Selenium (Se) is naturally occurring in the environment and is an essential nutrient in mammals. However, environmental Se can be increased to toxic levels through different industrial practices. The potential adsorption of the Se oxoanions, selenite and selenate, from aqueous solutions onto nanosynthesized MnFe2O4 was investigated using batch techniques and DRC-ICP-MS spectroscopy. The nanomaterial (NM) was laboratory synthesized through slow titration of a mixture of Fe2+ and Mn2+ ions. X-ray diffraction and Scherrer's equation were used to determine the phase of the material and crystallite size, respectively. The effects of pH, reaction time, competitive anions, and the adsorption capacity of the synthesized NM to bind selenite and selenate were investigated. The Langmuir isotherm was used to determine the binding capacity of the NM. Results showed that the phase of the nanomaterial was similar to Jacobsite with a size of 27.5 nm. Results also showed that the sorption of either 100 ppb of selenite or selenate was pH independent in the pH range 2 to 6 and occurred within 5 min of contact time. The introduction of Cl− and NO3− anions individually added to solution had no significant effect on the sorption of either selenite or selenate. However, it was found that the addition of SO42− had a competitive effect only on the sorption of selenate, first seen at 10 ppm and more pronounced at 100 ppm of SO42−. In the presence of 100 ppm of PO43−, the adsorption of selenate decreased to 87% while selenite sorption decreased to 20%. From the Langmuir isotherm equation it was determined that the nano-Jacobsite had a selenite and selenate binding capacity of 6573.76 and 769.23 mg Se/kg of NM, respectively. |
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