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| Solvent regulated efficient hydrodechlorination of polychlorinated biphenyls over Pd/C catalyst |
| LIU Su-jing1,2, YU Jia-wen1,2, ZHOU Xiao-chen1,2, LI Xiao-han1,2, LI Tian-cheng1,2, LIU Ying1,2, XIA Chuan-hai1,2, CUI Qing-chun2, MA Xuan-xuan1,2 |
1. The Institute of Advanced Study of Coastal Ecology, Ludong University, Yantai 264025, China;
2. School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China |
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Abstract The Pd/C catalyst was synthesized by deposition-precipitation method. The effect of solvent on catalytic hydrodechlorination was studied for the disposal of 4-chlorobiphenyl over Pd/C catalyst, and biphasic n-butanol-water solvent was established for efficient hydrodechlorination of high concentration capacitor oils (mainly polychlorinated biphenyls). It was found that protic solvents more favoured liquid-phase hydrodechlorination. Moreover, the addition of water promoted Pd/C catalyzed hydrodechlorination of 4-chlorobiphenyl in isopropanol-water solvent and biphasic organic-water solvent. The results showed that complete conversion of 4-CBP could be achieved in biphasic n-butanol-water (1:3, V/V) solvent within 90min, and the catalyst could be recovered and reused at least 8 times. In the biphasic n-butanol-water (1:3, V/V) solvent, capacitor oil containing polychlorinated biphenyls (10g/L) could be completely hydrodechlorinated into biphenyl over Pd/C catalyst within 360 min.
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Received: 13 May 2019
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