Efficient activation of persulfate by calcium sulfate whisker supported nanoscale zero-valent iron for methyl orange removal.

ABSTRACT: In order to improve the utilization of nanoscale zero-valent iron (nZVI) in activating persulfate (PS), a composite material of nZVI/CSW with nZVI supported on calcium sulfate whiskers (CSWs) was synthesized in this study. The activity of the nZVI/CSW-PS system was evaluated by the removal of methyl orange (MO) in the aqueous phase. With the optimization of response surface methodology (RSM), the degradation efficiency of 20.0 mg L^-1 MO could increase to 98.13% in 5 min at the dosage of 1.03 g L^-1 nZVI/CSW-2, 3.51 mM PS at a temperature of 40.8 °C. The results of scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests showed that the nZVI particles were well dispersed on the CSW surface in a Fe²⁺/CSW molar ratio of 0.25 : 1, which is approximat

SUBMITTER: Han Y 

PROVIDER: S-EPMC8691138 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature