Cooperation of Fe(II) and peroxymonosulfate for enhancement of sulfamethoxazole photodegradation: mechanism study and toxicity elimination.

ABSTRACT: This study aims at systematically examining the potential of removing the emerging pollutant sulfamethoxazole (SMX) from aqueous solution under photo-assisted peroxymonosulfate (PMS) activation by Fe(ii). The residual SMX was determined by HPLC analysis. The concentration of Fe(ii) ([Fe(ii)]) was monitored during SMX degradation. Fe(ii) and PMS cooperated with each other for faster SMX photodegradation; a relatively lower or higher molar ratio between Fe(ii) and PMS led to lower SMX removal efficiency due to the insufficient radicals or scavenging effect. A fixed reaction ratio of [Fe(ii)]_Δ : [PMS]₀ with 1.6 : 1 at the first 5 min was detected for reactions with [Fe(ii)]₀ ≥ 0.5 mM or [PMS]₀ ≤ 0.25 mM. The pH level of around 6.0 was recommended fo

SUBMITTER: Gong H 

PROVIDER: S-EPMC9056884 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature