Effects of catalytic ozonation catalyzed by TiO2 activated carbon and biochar on dissolved organic matter removal and disinfection by-product formations investigated by Orbitrap mass spectrometry

Byproduct formation in heterogeneous catalytic ozonation processes

“…cOH and cO 2 − ). 68 Furthermore, a few hundred CHO features were increased or newly formed aer oxidation treatment, indicating the formation of OBPs, whereas the number of OBPs was also lower for O 3 /TiO 2 -AC processes than ozonation. 68 Reduction of UV 254 (mainly denoting organic compounds with double bonds or aromatic structures) seemed to depend on the characteristics of DOM as well as catalysts.…”

“…68 Furthermore, a few hundred CHO features were increased or newly formed aer oxidation treatment, indicating the formation of OBPs, whereas the number of OBPs was also lower for O 3 /TiO 2 -AC processes than ozonation. 68 Reduction of UV 254 (mainly denoting organic compounds with double bonds or aromatic structures) seemed to depend on the characteristics of DOM as well as catalysts. An enhanced UV 254 removal was observed in catalytic ozonaton of ltered water NOM with TiO 2 /Zeolite and CeO 2 , 55,65 but a lower removal than ozonation was reported for MgO and goethite.…”

“…Compared to ozonation alone, HCO generally led to a higher TOC/DOC removal 20,56,[65][66][67] but the ratio of assimilable organic carbon (AOC) was reported to increase in HCO treated water especially in the hydrophilic acid and base fractions of DOM. 56,65,68 Dabuth et al investigated molecular changes of DOM aer catalytic ozonation with TiO 2 coated activated carbon (TiO 2 -AC) employing unknown screening analysis with Orbitrap mass spectrometry, and reported that catalytic ozonation decreased or removed more CHO features than that of ozonation alone owing to the generation of more reactive species (e.g. cOH and cO 2 − ).…”

Molecular Characteristics and Formation Mechanisms of Unknown Ozonation Byproducts during the Treatment of Flocculated Nanofiltration Leachate Concentrates Using O3 and UV/O3 Processes

“…Wang et al reported that OBPs are composed of large amounts of formaldehyde, methylglyoxal, and other aldehydes . Dabuth et al found that OBPs could be chemically characterized by a low molecular weight (MW) and high oxidation state . Phungsai et al found that ozonation tended to favor reactions with the less saturated CHO organic matter and produce more saturated OBPs in the same alkylation families .…”

“…20 Dabuth et al found that OBPs could be chemically characterized by a low molecular weight (MW) and high oxidation state. 21 Phungsai et al found that ozonation tended to favor reactions with the less saturated CHO organic matter and produce more saturated OBPs in the same alkylation families. 22 Jennings et al applied a direct injection of effluent organic matter with online liquid chromatography− Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and discovered over 1500 different types of high-polarity oxygen-containing OBPs in a sewage treatment plant effluent after an O 3 treatment.…”