Green water-etching synthesized La-MIL-101(Fe)-NH2@SiO2 yolk-shell nanocomposites with superior pH stability for efficient and selective phosphorus recovery

Li, Shuangli; Zhang, Yu; Qiao, Sen

doi:10.1016/j.jwpe.2023.103821

Cited by 9 publications

(1 citation statement)

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“…The peak at 550 cm −1 corresponded to the single bond vibration of Fe-O in MOFs [30]; the absorption peak at 761 cm −1 corresponded to the bending vibration of C-H; and the characteristic peaks around 1600-1300 cm −1 originate from the symmetrical and asymmetrical stretching vibrations of O-C-O [31]. The absorption peaks located at 1251 cm −1 and 1628 cm −1 corresponded to ν(C-N) and δ(N-H) [32], respectively, and the peaks at 3357 cm −1 and 3442 cm −1 were due to the stretching vibration of -NH2 [33], which confirmed the presence of amino functional groups. The Fe 2p spectrogram showed two fitted peaks in Figure 4c; the corresponding peaks of Fe 3+ were at 2p1/2 and 2p3/2 with binding energies of 727.44, 713.03 eV [35]; and the corresponding peaks of Fe 2+ were at 2p1/2 and 2p3/2 with binding energies of 725.06, 711.31 eV [36,37], respectively.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Degradation of Orange G Using PMS Triggered by NH2-MIL-101(Fe): An Amino-Functionalized Metal–Organic Framework

Mo,

Chen,

Wang

2024

Molecules

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As an azo dye, OG has toxic and harmful effects on ecosystems. Therefore, there is an urgent need to develop a green, environmentally friendly, and efficient catalyst to activate peroxymonosulfate (PMS) for the degradation of OG. In this study, the catalysts MIL-101(Fe) and NH2-MIL-101(Fe) were prepared using a solvothermal method to carry out degradation experiments. They were characterized by means of XRD, SEM, XPS, and FT-IR, and the results showed that the catalysts were successfully prepared. Then, a catalyst/PMS system was constructed, and the effects of different reaction systems, initial pH, temperature, catalyst dosing, PMS concentration, and the anion effect on the degradation of OG were investigated. Under specific conditions (100 mL OG solution with a concentration of 50 mg/L, pH = 7.3, temperature = 25 °C, 1 mL PMS solution with a concentration of 100 mmol/L, and a catalyst dosage of 0.02 g), the degradation of OG with MIL-101(Fe) was only 36.6% within 60 min; as a comparison, NH2-MIL-101(Fe) could reach up to 97.9%, with a reaction constant k value of 0.07245 min−1. The NH2-MIL-101 (Fe)/PMS reaction system was able to achieve efficient degradation of OG at different pH values (pH = 3~9). The degradation mechanism was analyzed using free-radical quenching tests. The free-radical quenching tests showed that SO4•−, •OH, and 1O2 were the main active species during the degradation of OG.

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