Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 237, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2019.116391
Keywords
Ternary micro-electrolysis; Synergistic effects; p-Chloronitrobenzene; Enhanced hydrodechlorination
Categories
Funding
- National Natural Science Foundation of China [21707090]
- Chinese Postdoctoral Science Foundation [2017M611590]
- Shanghai Natural Science Foundation [14ZR1428900]
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A ternary micro-electrolysis system composed of a granular activated carbon (GAC) supported Fe-0 and Cu-0 nanocomposite (GAC-Fe-Cu) was synthesized for the removal of p-chloronitrobenzene (p-CNB). GAC-Fe-Cu exhibited excellent reusability and stability based on the stably anchored nanoparticles and the inner tailored Fe-0 with persistent activity. A two-stage reaction revealed the simultaneous adsorption and degradation in the process of p-CNB removal, and the iron corrosion reaction mainly dominated the latter. A stepwise reduction of p-CNB was observed, where the main intermediates, such as p-chloroaniline (p-CAN) and aniline (AN), were formed in sequence. Furthermore, the mechanism of p-CNB removal could be explained by the synergistic effects of GAC-Fe-Cu. p-CNB could be rapidly adsorbed onto the surface of the system for in situ reduction. The conductive GAC cathode pre-accepted the released electrons from the Fe-0 anode, and transferred them to the Cu-0 cathode. Then, the electron-rich Cu-0 cathode could intensively release electrons to form the point discharge phenomenon, which possessed strong reducing power to dramatically increase the hydrodechlorination rate of p-CAN. Additionally, the -C-OH and -COOH on the GAC surface could absorb p-CAN through electrostatic interactions with the amine group (-NH2), facilitating the selectivity of p-CAN dechlorination.
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