Preparation of Hydrophilic FePt Nanoparticles and co-Catalyze Degrade Organic Pollutants †

doi:10.7503/cjcu20190661

Abstract

Abstract:

Hydrophilic ultra-small FePt nanoparticles(NPs) stabilized with cysteine were facile synthesized in water phase by one pot method. As-prepared FePt NPs showed good catalytic degradation activity of common organic pollutants in water. NaBH₄ and H₂O₂ were chose as the co-reactant to degrade rhodamine B(RhB), 4-nitrophenol(4-NP) and methylene blue(MB), respectively. The results showed that the degradation rates were more than 90% for three organic pollutants by FePt NPs. At the same time, we focus on the discussion of the collaborative catalytic mechanism between FePt atom pairs, and reveal the difference between the microscopic reaction process and catalytic mechanism in different reaction systems. Moreover, magnetic test results show that FePt catalyst can be collected and reused by external magnetic field, which solves the problem of secondary pollution of the catalyst. This study provides an idea for the design of green catalyst.

Key words: Hydrophilic FePt NPs, Collaborative catalysis, Degradation, Organic pollutant, Recyclable

CLC Number:

O614.8

TrendMD:

LIU Congyuan, LIU Jia, DU Peiyao, ZHANG Zhen, LU Xiaoquan. Preparation of Hydrophilic FePt Nanoparticles and co-Catalyze Degrade Organic Pollutants ^†[J]. Chem. J. Chinese Universities, 2020, 41(4): 697.

Figures/Tables 13

Scheme 1 Schematic illustration of the preparation of FePt NPs and their application for degradation of organic pollutants

Fig.1 TEM images(A—C) and size distribution(D) of FePt NPs

Fig.2 XRD patterns(A) and EDS profile(B) of FePt NPs

Fig.3 XPS survey scan Fe2p(A), Pt4f (B), C1s(C) and N1s(D) of FePt NPs

Fig.4 FTIR spectra of FePt NPs(a) and L-Cys(b)(A) and UV-Vis spectrum of FePt NPs(B) Inset of (B) is the photograph of FePt NPs solution.

Fig.5 Degradation of RhB with(A) and without(B) FePt catalyst(A) a. RhB; b.—h. RhB+FePt+NaBH4. Reaction time/min, b.—h.: 0, 1, 3, 5, 10, 15, 20. (B) a. RhB; b.—i. RhB+NaBH4. Reaction time/min, b.—i.: 0, 1, 3, 5, 10, 15, 20, 25, 30. Inset of (A) show the color change of RhB solution before and after degradation.

Scheme 2 Catalytic mechanism of FePt for the degradation of RhB with NaBH4 as reducing agent

Scheme 3 Reduction process of RhB by FePt NPs under the help of NaBH4

Fig.6 Degradation of 4-NP with(A) and without(B) PePt catalyst(A) a. 4-NP; b. 4-NP+NaBH4; c.—e. 4-NP+NaBH4+FePt. Reaction time/min, c.—e.: 1, 3, 5.^ (B) 4-NP+NaBH4. Reaction time/min, a.—e.: 0, 1, 3, 5, 7.

Fig.90 Scheme 4 Reduction process of 4-NP catalyzed by ePt NPs under the help of NaBH4

Fig.7 Degradation of MB P with(A) and without(B) PePt catalyst(A) a. MB; b. MB+FePt; c.—f. MB+FePt+H2O2. Reaction time/min, c.—f.: 1, 3, 8, 15. (B) a. MB; b. MB+H2O2, 20 min.

Fig.91 Scheme 5 Mechanism of degradation of MB by FePt NPs with the participation of H2O2

Fig.8 Magnetization hysteresis curves of FePt NPs at 300 K

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