Mineralization of salicylic acid via catalytic ozonation with Fe-Cu@SiO2 core-shell catalyst: A two-stage first order reaction

摘要: Abstract Mesoporous Fe-Cu@SiO2 core-shell catalyst was synthesized and assessed for its catalytic activity in the ozonation of salicylic acid (SA). The characterized by XRD, TEM, SEM, XPS, H2-TPR, etc. exhibited a regular spherical shape had surface area at 1216 m2 g−1. wrapping metal components their strong interaction prevented leaching. showed highest SA mineralization when compared with Fe@SiO2 Cu@SiO2. In Fe-Cu@SiO2/O3, 88% TOC removed, which 2.5 times as much that sole ozonation. degradation efficiency Fe-Cu@SiO2/O3 increased initial pH. O3, ·OH H2O2 were main reactive oxygen species accounting mineralization. Due to scavenging effect ·OH, NH4+, NO3− humic acids would inhibit Fe-Cu@SiO2/O3. Acidic sites, vacancies Fe-Cu(I/II) electron transfer responsible ozone decomposition generation. proceeded through mechanism. Moreover, O3 both two-stage pseudo first-order kinetics (stage I: 0–45 min; stage II: 45–120 min). intermediates detected investigate reaction pathway. ORP EEM used monitor process. Great difference found carboxylic accumulation accelerated removal oxalic acid-like kinetics.