期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 414, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125528
关键词
Sulfate radical-photo-Fenton-like; Nitrogen vacancies; g-C3N4; NiCo2O4; Z-scheme
资金
- National Natural Science Foundation of China [U20A20322, 51678270, 21872063]
- Programme of Introducing Talents of Discipline to Universities [B16020]
The study designed a Z-scheme photocatalyst to enhance the degradation efficiency of tetracycline hydrochloride, achieving high removal rates for carbamazepine, 4-chlorophenol, atrazine, and p-nitrophenol.
Limited peroxymonosulfate (PMS, HSO4-) activation efficiency resulted from slow metal reduction has been a challenge in visible-light (vis) assisted sulfate radical-based oxidation. Herein, a Z-scheme photocatalyst composed of nitrogen-defect-rich graphitic carbon nitride nanosheets embedded with nickel cobaltate nanoparticles (NiCo2O4/g-C3N4-N-vac) was elaborately designed to accelerate Ni(III)/Ni(II) and Co(III)/Co(II) cycles for PMS activation in PMS/vis system. The NiCo2O4/g-C3N4-N-vac exhibited remarkable enhancement with a tetracycline hydrochloride (TCH) degradation rate constant (0.1168 min(-1)), higher than those of NiCo2O4/g-C3N4 (0.0724 min(-1)) and g-C3N4 (0.0233 min(-1)), respectively. Also, the removal efficiencies of 95.5%, 94.2%, 98.0% and 91.4% for carbamazepine, 4-chlorophenol, atrazine and p-nitrophenol were achieved within 30 min, respectively. Theoretical and experimental results suggested that nitrogen (N) vacancies modulated electric structure to build Z-scheme-charge-transfer platform for rapid reduction of Ni(III) and Co(III), thereby accelerating PMS activation for remarkable removal of emerging pollutants. NiCo2O4/g-C3N4-N-vac exhibited excellent stability and corresponding electrical energy per order (EE/O) in different water matrix was evaluated. Additionally, TCH degradation behavior, pathways and toxicity of products were analyzed, respectively. This work provided an novel paradigm to design the efficient photo-activator of PMS for environmental remediation.
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