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| Degradation of dimethyl phthalate in microwave-induced NiO catalytic system |
| CHEN Cheng1,2, H E Huan2,3, YANG Shao-gui2,3, SUN Cheng2 |
1. School of Chemistry and Life Science, Chengdu Normal University, Chengdu 611130, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China;
3. School of Environment, Nanjing Normal University, Nanjing 210023, China |
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Abstract NiO nanoparticles were synthesized through ultrasonic radiation precipitation-oxidation process, calcined at 300℃, and characterized by XRD, XPS, BET, and SEM. The degradation of dimethyl phthalate (DMP) in the microwave-induced NiO catalytic system was investigated. The main intermediates were separated and identified by GC/MS and LC/MS to elucidate the potential mechanisms of the degradation process. Results showed that DMP could be effectively degraded in the experimental conditions, with up the 70% removal rate in 15min by 750W microwave and 0.4mg/L NiO. The degradation rate could be enhanced with the increase of the power of microwave, the dosage of catalyst and the initial pH of solution. The main degradation products of the DMP were identified to be p-carbomethoxy-benzoic acid, phthalic acid, terephthalic acid, carbomethoxy-phthalic acid, and a double-ring product produced through condensation of two lateral chains of DMP and so on. Consequently, the possible degradation mechanism of DMP might include 6 processes:hydrolysis, isomerization, carbomethoxylated reaction, hydroxylation, condensation of lateral chains, hydroxylation and ring-opening mineralization.
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Received: 23 November 2017
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