Influence Rule of Organic Solvents Methanol from Sample Preparation on Degradation Rate and Mechanism of Atrazine in UV-based Oxidation Processes
Received date: 2018-09-04
Online published: 2018-11-26
Supported by
Project supported by the Natural Science Foundation of Shandong Province (No. ZR2017BEE016), the National Natural Science Foundation of China (No. 51308437) and the Science Fund of Yantai University (No. TM17B19).
Stock solutions of organic micro-pollutants with low water solubility are commonly prepared using organic solvents in laboratory studies on degradation of these organic compounds. Dilution of the stock solution unavoidably introduces a small amount of organic solvent into the experimental working solutions. This could possibly affect the estimation of the degradation rate constants (kobs) of these organic micro-pollutants by UV-based oxidation processes. To demonstrate this problem, the effect of organic solvents on the degradation rate of atrazine (ATZ) has been investigated in the sole-UV, UV/H2O2 and UV/TiO2 process at the concentration levels that would likely be derived from stock solutions. Organic solvent methanol (MeOH) commonly used for stock-solution preparation was selected. The degradation of ATZ was investigated under ultraviolet irradiation (253.7 nm). The reaction was conducted in an annular photochemical reactor, in the axis of which a low-pressure mercury lamp (LPUV) was installed. The photon flux into the solution from the LPUV was determined to be at 1.18×10-7 Einstein/s. A magnetic stirrer was located at the bottom of the reactor to maintain homogeneity of the reacting solution. A thermostatic water recirculation system was used to control the solution temperature at 20±0.5℃. Prior to irradiation, the mercury lamp was ignited for 30 min for a stable output. UV photo-oxidation was performed with ultrapure water containing an initial 0.1 or 5 mg/L ATZ and different volume ratio of methanol. Solution pH value of 4.0, 7.0 and 10.0 was buffered using phosphate or borate. Determination of ATZ using ultra-performance liquid chromatography-electrospray-triple quadrupole mass spectrometry coupled with an ACQUITYTM UPLC BEH C8 separation column. The results show that the reaction rate of ATZ in UV/TiO2 process could be affected significantly by the presence of MeOH, even at a concentration well below that possibly introduced during the preparation of working solutions from the organic solvent stock solutions (e.g. 0.01%, V/V). With the increase of MeOH concentration, the kobs of ATZ in UV/TiO2 process gradually decreases. The organic solvents having a stronger reaction activity with·OH tend to impose a greater effect on the kobs of ATZ. However, MeOH does not affect kobs of photolysis of ATZ in sole-UV process, and a small effect for the kobs of ATZ in UV/H2O2 process. In addition, MeOH in the reaction system does not affect the speciation and degradation pathway of ATZ under different UV-based oxidation processes. The findings here provide a plausible explanation for the discrepancies in the reaction rate constants reported in the literature for some organic micro-pollutants during the UV-based oxidation processes.
Liu Yucan , Su Miaomiao , Zhang Yan , Duan Jinming , Li Wei . Influence Rule of Organic Solvents Methanol from Sample Preparation on Degradation Rate and Mechanism of Atrazine in UV-based Oxidation Processes[J]. Acta Chimica Sinica, 2019 , 77(1) : 72 -83 . DOI: 10.6023/A18090365
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