Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133134
Keywords
Two-dimensional materials; Nano-flakes; Persulfate; Nickel oxide; Hierarchical
Categories
Funding
- National Natural Science Foundation of China [51978266, 21806124]
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Hierarchically porous NiO catalyst assembled with 2D nano-flakes is effective for activating PDS to degrade organic pollutants like BPA. The optimized NiO-12 catalyst exhibits high specific surface area, hierarchically porous structure, and efficient electron transfer for enhanced BPA degradation. This study demonstrates a new strategy for fabricating hierarchical 2D porous catalysts with application potential in practical wastewater treatment.
Heterogeneous catalysts with hierarchically porous structure are highly efficient to catalyze chemical reactions. In this work, two-dimensional (2D) nano-flakes assembled flower-like NiO is fabricated and utilized for activating peroxydisulfate (PDS) to degrade organic pollutants bisphenol A (BPA). The results demonstrate that the prepared catalyst exhibits well organized flower structure composed of uniform 2D nano-flakes. PDS combines with the catalyst to form surface-activated NiO-PDS complex, subsequently depriving electrons from BPA. For the optimized NiO-12 catalyst, large specific surface area and hierarchically porous structure benefit to exposes abundant active sites while low resistance promotes electrons transfer, bringing the high BPA degradation rate constant of 0.28 min-1 under the condition of 20 mg/L initial concentration. NiO-12 exerts a capability of catalyzing PDS to mineralize 34% of practical packaging wastewater. This study provides a new strategy to fabricate hierarchical 2D porous catalysts for persulfate activation, with application potential in practical wastewater treatment.
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