期刊
WATER RESEARCH
卷 149, 期 -, 页码 136-148出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.11.002
关键词
Catalytic ozonation; Mixed quartz sand; Atrazine; Hydroxyl radical; Heterogeneous catalysis
资金
- National Key Research and Development Program [2017YFA0207203, 2016YFC0401107]
- National Natural Science Foundation of China [51779065]
- HIT Environment and Ecology Innovation Special Funds [HSCJ201605]
- China Scholarship Council [201806120332]
- National Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07201003-03]
A light-weight granular mixed-quartz sand (denoted as L-GQS) combined with stirring-assisted bubble column reactor was firstly applied in catalytic ozonation of atrazine. The L-GQS, with a density of 2.36 g cm(-3) and average diameter of ca. of 4 mm, was readily churned up and uniformly distributed within the solution in the reactor. The introduction of L-GQS was found to exhibit enhanced catalytic ozonation of atrazine, with the increase in degradation rate and the dissolved organic carbon (DOC) removal being more than 2-fold for the catalytic process (L-GQS dosage = 5 g L-1, [atrazine](0) = 50 mu M, [O-3] = 25 mg L-1, gas flow = 0.2 L min(-1), at pH 7.0 and 293 K). The L-GQS settled at the bottom of the reactor after experimentation, allowing its easy separation from the solution. A complete characterization of the material (XRD, XPS, FTIR, FE-SEM/EDS, BET and pH(pzc)) revealed that L-GQS consisted of alpha-quartz, beta-cristobalite, anorthoclase and small amount of iron oxy-hydroxides. Hydroxyl groups, Bronsted acid sites and Lewis acid sites on the surface of L-GQS all contributed to the atrazine adsorption, ozone decomposition and center dot OH generation. The L-GQS catalyzed ozonation exhibited superior atrazine degradation and mineralization rates in a wide range of pH (3.0-9.0) and reaction temperatures (278 K-293 K). Also, an enhancement of DOC abatement was observed both in presence of natural organic matter isolates and natural water matrices (river water) when L-GQS was used. Finally, the degradation mechanism was proposed, based on the intermediates and by-products formation analyzed by LC-QTOF-MS/MS and ionic chromatography. Our results indicate that the L-GQS combined with stirring-assisted bubble column reactor could be utilized as an enhancement of ozone-based advanced oxidation processes. (C) 2018 Elsevier Ltd. All rights reserved.
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