biostudies-literatureHan YNational Basic Research Program of ChinaAnhui Department of EducationNatural Science Foundation of Anhui Province452-461https://www.ebi.ac.uk/biostudies/studies/S-EPMC8691138biostudies-literatureUnknown11(1)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 approximatRSC advancesEfficient activation of persulfate by calcium sulfate whisker supported nanoscale zero-valent iron for methyl orange removal.PMC86911382019YFC0408501KJ2019A05822008085QE243KJ2019A0552Lei LNiu ZHan YSun HHou HZhou XXu ZZhou ZfalseEfficient activation of persulfate by calcium sulfate whisker supported nanoscale zero-valent iron for methyl orange removal.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 approximat2020-01-01T00:00:00Z2020 Dec2025-04-25T22:59:35.72Z2025-04-06T09:13:00.844ZS-EPMC86911383542302310.1039/d0ra09241j