title: [Dynamic effects of commonly co-existing anions on the removal of selenite from groundwater by nanoscale zero-valent iron].
abstract: Batch experiments are used to research selenite removal from groundwater by nanoscale zero-valent iron (nZVI) , and dynamic effects of commonly co-existing anions on the removal of selenite are also investigated. The results showed that under anoxic conditions,when nZVI dose was 0.1 g.L-1 , the concentration of Se( IV)/sodium chloride was 100 micromol.L-1/0. 01 mol L-1 , pH = 7.0, T = 25 degrees C +/- 1 degrees C, auto-adding 1 mmol.L -1 CO(2-)(3) or SO(2-)(4) , 5 mg. L -1 humic acid (HA), the removals of Se( IV ) were obviously inhibited. The weak effect on the removal of Se( IV) was observed when added 0. 5 mmol L- Ca2+ or Mg2 ,while concentrations of Ca2+ and Mg2+ were 3 mmol L-1 and 3 mmol L-1 respectively, removal efficiency of Se( IV) were evidently decreased. Without coexisting ions, Se( IV) were totally removed in 20 min, while with co-existing ions, removal efficiency of Se( NV) were achieved 100% in 30 min. Bivalent iron tended to stationary with the remove of Se( WV) in reaction processes. ORP rapidly decreased from positive to negative in the process of reaction, which illustrated the process of remove Se( IV) by nZVI was the reduction reaction.
authors: Wen-Jun
authors: WJ
authors: Yang
authors: Ying-Qing
authors: YQ
authors: Guo
authors: Er-Deng
authors: ED
authors: Du
mesh_terms: D000838:Anions / Q000737:chemistry; D052918:Environmental Restoration and Remediation; D060587:Groundwater / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D020887:Selenious Acid / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000838:Anions; D014874:Water Pollutants, Chemical; D007501:Iron; D020887:Selenious Acid