TY - JOUR
T1 - Fe(II) activated calcium peroxide/peroxymonosulfate
T2 - A practical system for phenanthrene degradation and upholding ecological pH
AU - Masud, Md Abdullah Al
AU - Narendra Kumar, Alam Venugopal
AU - Shin, Won Sik
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/7/15
Y1 - 2023/7/15
N2 - Groundwater contamination by polycyclic aromatic hydrocarbons (PAHs) can have adverse effects on both the subsurface environment and human health. This study aimed to demonstrate the degradation of PHE using a coupled oxidant system, that involves simultaneous injection of Fe(II) and oxidants, CaO2 (CP) and peroxymonosulfate (PMS). To ensure the environmental compatibility, coupled oxidant strategy was proposed to maintain the pH level between 6.0 and 8.0 following the treatment process. The influence of reaction conditions including concentration of PMS, CP, and Fe(II) concentrations, initial pH, anions, and humic acid on PHE degradation were assessed. Scavenger experiments and electron spin resonance (ESR) analysis confirmed that hydroxyl radical (HO[rad]−) and non-radical singlet oxygen (1O2) were the primary reactive oxygen species (ROS) in the reported system. PHE degradation mechanism in the coupled oxidant system was proposed based on by-products identification. In addition, the CP/PMS/Fe(II) system showed promising degradation performance for naphthalene and pyrene, indicating the proposed strategy could be a viable option for removing a broad spectrum of PAHs. Finally, the coupled oxidant system was optimized to achieve best PHE removal efficiency under natural groundwater (NGW) conditions.
AB - Groundwater contamination by polycyclic aromatic hydrocarbons (PAHs) can have adverse effects on both the subsurface environment and human health. This study aimed to demonstrate the degradation of PHE using a coupled oxidant system, that involves simultaneous injection of Fe(II) and oxidants, CaO2 (CP) and peroxymonosulfate (PMS). To ensure the environmental compatibility, coupled oxidant strategy was proposed to maintain the pH level between 6.0 and 8.0 following the treatment process. The influence of reaction conditions including concentration of PMS, CP, and Fe(II) concentrations, initial pH, anions, and humic acid on PHE degradation were assessed. Scavenger experiments and electron spin resonance (ESR) analysis confirmed that hydroxyl radical (HO[rad]−) and non-radical singlet oxygen (1O2) were the primary reactive oxygen species (ROS) in the reported system. PHE degradation mechanism in the coupled oxidant system was proposed based on by-products identification. In addition, the CP/PMS/Fe(II) system showed promising degradation performance for naphthalene and pyrene, indicating the proposed strategy could be a viable option for removing a broad spectrum of PAHs. Finally, the coupled oxidant system was optimized to achieve best PHE removal efficiency under natural groundwater (NGW) conditions.
KW - Calcium peroxide
KW - Coupled oxidant
KW - Natural groundwater
KW - Peroxymonosulfate
KW - Phenanthrene
UR - http://www.scopus.com/inward/record.url?scp=85153593288&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2023.123902
DO - 10.1016/j.seppur.2023.123902
M3 - Article
AN - SCOPUS:85153593288
SN - 1383-5866
VL - 317
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 123902
ER -
