期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 10, 期 3, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.107406
关键词
Fe-doped g-C3N4; Diatomite; Photo-Fenton process; Tetracyclines
资金
- National Key R&D Program of China [2019YFC0408500]
- Key Science and Technology Projects of Anhui Province [202003a07020004]
- Program of Distinguished Professor in BR Countries [G20200012010]
In this study, iron-doped carbon nitride was fabricated and shown to efficiently degrade tetracycline hydrochloride under visible light irradiation. The catalyst exhibited excellent catalytic performance over a wide pH range and showed minimal iron leaching after repeated use.
We fabricated iron-doped carbon nitride on a diatomite surface through a single-step polymerization (FGD-x, where x represents Fe loading content). The FGD-x efficiently degrades tetracycline hydrochloride by a collaborative photo-Fenton process. The FGD-3 (FeCl3 loading 75 mg) showed the best catalytic performance in TC degradation with minimal H2O2 (viz. 1 mmol/L) at a wide pH range (2.0-7.0). Under optimized conditions, the FGD-3 can degrade 98.3% of 20.0 mg/L TC at pH 4.0 within 100 min under visible light irradiation. The scanning electron microscopic and X-ray photon spectroscopic data show that iron is successfully doped on g-C3N4. Electrochemical impedance spectroscopy and transient photocurrent performance analyses confirmed that photogenerated electrons rapidly transfer at FGD-3 and solution interface. Free radical quenching experiments and electron spin resonance analysis show that h(+), center dot O-2(-), and center dot OH can degrade TC efficiently. Besides, FGD-3 has an ultra-high catalytic activity and extremely low iron leaching after repeated use. The FGD-3 provides a feasible way to design a new photo-Fenton catalyst for the destruction of organic pollutants from water.
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