Impacts of vanadium oxide on the degradation of 2,4-dinitrotoluene by persulfate
CHANG Wenjie1,, LI Xiaodong1, SHEN Jialun1, SUN Zongquan1,,, MA Fujun1,2, GU Qingbao1 1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, China
Abstract:Vanadium is a common trace element in soil; the effects and mechanisms of vanadium oxides on organic degradation by activated persulfate (PS) are still unclear. In this study, the vanadium trioxide (V2O3), vanadium dioxide (VO2), and vanadium pentoxide (V2O5) were selected to investigate the performance and related mechanism of 2,4-dinitrotoluene (2, 4-DNT) degradation by the PS/V2O3, PS/VO2, and PS/V2O5 systems. The results showed that these three systems had significant different performance of degradation, and the PS/V2O3 system presented stronger oxidation capacity than other two systems. When the reaction time was 10 h, the degradation efficiency of 2,4-DNT was 77.2%, and its degradation kinetics could be well fitted by the pseudo-first model. The electron spin resonance analysis and quenching experiments indicated that hydroxyl radicals were the dominant reactive species for 2,4-DNT degradation by PS/V2O3 oxidation. V2O3 concentration, PS concentration, and initial pH were the important factors affecting the degradation of 2,4-DNT by PS/V2O3 oxidation. The degradation efficiency of 2, 4-DNT first increased and then decreased with the increase of V2O3 concentration, and the degradation efficiency of 2, 4-DNT reached the highest value of 91.70% at 5.0 mmol·L?1 V2O3; The degradation of 2, 4-DNT in the PS/V2O3 system increased significantly with the increase of PS concentration. At the initial pH of 3.0, 5.0, 7.0 and 9.0, the degradation efficiencies of 2, 4-DNT by 10h oxidation reaction with V2O3 activated PS were 85.91%, 80.07%, 80.72% and 85.72%, respectively. The results provide a theoretical basis for further clarifying the effects of soil and groundwater substrates on in situ chemical oxidation of persulfate. Key words:soil remediation/ vanadium oxides/ persulfate/ 2,4-DNT/ hydroxyl radical.
图1钒氧化物活化PS降解2,4-DNT Figure1.2,4-DNT degradation by PS activated with vanadium oxide
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1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2.National Engineering Laboratory for Site Remediation Technologies, Beijing 100015, China Received Date: 2020-12-15 Accepted Date: 2021-03-26 Available Online: 2021-06-25 Keywords:soil remediation/ vanadium oxides/ persulfate/ 2,4-DNT/ hydroxyl radical Abstract:Vanadium is a common trace element in soil; the effects and mechanisms of vanadium oxides on organic degradation by activated persulfate (PS) are still unclear. In this study, the vanadium trioxide (V2O3), vanadium dioxide (VO2), and vanadium pentoxide (V2O5) were selected to investigate the performance and related mechanism of 2,4-dinitrotoluene (2, 4-DNT) degradation by the PS/V2O3, PS/VO2, and PS/V2O5 systems. The results showed that these three systems had significant different performance of degradation, and the PS/V2O3 system presented stronger oxidation capacity than other two systems. When the reaction time was 10 h, the degradation efficiency of 2,4-DNT was 77.2%, and its degradation kinetics could be well fitted by the pseudo-first model. The electron spin resonance analysis and quenching experiments indicated that hydroxyl radicals were the dominant reactive species for 2,4-DNT degradation by PS/V2O3 oxidation. V2O3 concentration, PS concentration, and initial pH were the important factors affecting the degradation of 2,4-DNT by PS/V2O3 oxidation. The degradation efficiency of 2, 4-DNT first increased and then decreased with the increase of V2O3 concentration, and the degradation efficiency of 2, 4-DNT reached the highest value of 91.70% at 5.0 mmol·L?1 V2O3; The degradation of 2, 4-DNT in the PS/V2O3 system increased significantly with the increase of PS concentration. At the initial pH of 3.0, 5.0, 7.0 and 9.0, the degradation efficiencies of 2, 4-DNT by 10h oxidation reaction with V2O3 activated PS were 85.91%, 80.07%, 80.72% and 85.72%, respectively. The results provide a theoretical basis for further clarifying the effects of soil and groundwater substrates on in situ chemical oxidation of persulfate.
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