TY - JOUR
T1 - Removals of Cr(VI) and Cd(II) by a novel nanoscale zero valent iron/peroxydisulfate process and its Fenton-like oxidation of pesticide atrazine
T2 - Coexisting effect, products and mechanism
AU - Diao, Zeng Hui
AU - Qian, Wei
AU - Zhang, Zai Wang
AU - Jin, Jian Chao
AU - Chen, Zhi Liang
AU - Guo, Peng Ran
AU - Dong, Fu Xin
AU - Yan, Liu
AU - Kong, Ling Jun
AU - Chu, Wei
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Nowadays, inorganic and organic pollutants always coexist in the environment, thus an economic and efficient treatment is urgently required. In this paper, a novel nanoscale zero valent iron (AMD-nZVI) produced from the reaction of acid mine drainage (AMD) with NaBH4 was combined with peroxydisulfate (PDS) for the simultaneous removals of Cr(VI), Cd(II) and atrazine (ATZ) in water. Results demonstrate that the reactivity of AMD-nZVI/PDS process toward Cr(VI) removal was superior to that of AMD-nZVI/HCl or AMD-nZVI/H2O2 process. The coexisting species inculding PO4 3-, HCO3 −, NO3 and humic acid exhibited obvious suppression on the Cr(VI) removal. The simultaneous removal efficiencies of Cr(VI), Cd(II) and ATZ by AMD-nZVI/PDS process were high up to 90% within 40 min. Most of Cr(VI) species were converted to Cr2O3 and Cr(OH)3, whereas both Cd(OH)2 and CdO were main Cd(II) species. The radical quenching tests affirmed that SO4 [rad]− was the primary radical species for ATZ degradation. A total of five intermediate products of ATZ were sucessfully identified, and the degradation of ATZ was achieved through dealkylation, dechlorinatione and hydroxylation processes. A possible reaction mechanism involving in Cr(VI) reduction, Cd(II) precipitation and ATZ Fenton-like oxidation by AMD-nZVI/PDS process therefore was proposed.
AB - Nowadays, inorganic and organic pollutants always coexist in the environment, thus an economic and efficient treatment is urgently required. In this paper, a novel nanoscale zero valent iron (AMD-nZVI) produced from the reaction of acid mine drainage (AMD) with NaBH4 was combined with peroxydisulfate (PDS) for the simultaneous removals of Cr(VI), Cd(II) and atrazine (ATZ) in water. Results demonstrate that the reactivity of AMD-nZVI/PDS process toward Cr(VI) removal was superior to that of AMD-nZVI/HCl or AMD-nZVI/H2O2 process. The coexisting species inculding PO4 3-, HCO3 −, NO3 and humic acid exhibited obvious suppression on the Cr(VI) removal. The simultaneous removal efficiencies of Cr(VI), Cd(II) and ATZ by AMD-nZVI/PDS process were high up to 90% within 40 min. Most of Cr(VI) species were converted to Cr2O3 and Cr(OH)3, whereas both Cd(OH)2 and CdO were main Cd(II) species. The radical quenching tests affirmed that SO4 [rad]− was the primary radical species for ATZ degradation. A total of five intermediate products of ATZ were sucessfully identified, and the degradation of ATZ was achieved through dealkylation, dechlorinatione and hydroxylation processes. A possible reaction mechanism involving in Cr(VI) reduction, Cd(II) precipitation and ATZ Fenton-like oxidation by AMD-nZVI/PDS process therefore was proposed.
KW - Atrazine (ATZ)
KW - Cd(II)
KW - Cr(VI)
KW - Nanoscale zero valent iron (nZVI)
KW - Peroxydisulfate (PDS)
UR - http://www.scopus.com/inward/record.url?scp=85084590048&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2020.125382
DO - 10.1016/j.cej.2020.125382
M3 - Journal article
AN - SCOPUS:85084590048
SN - 1385-8947
VL - 397
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 125382
ER -