In this study, double S-scheme heterojunctions were constructed by a simple hydrothermal and calcination method, accompanied by the special layered structure of BiOIO3 employed for its I- modification. This resulted in the formation of CeO2/[Bi6O6(OH)3](NO3)3·1.5H2O (BHN)/I--BiOIO3, which possesses double S-scheme heterojunctions. The improvement of photocatalytic degradation efficiency is derived from the result of the synergistic effect of double S-scheme heterojunctions and I- modification. In photocatalytic degradation experiment with norfloxacin as the target pollutant, the degradation efficiency of typical sample (CeO2/BHN/I--BiOIO3-2) reaches 97.50%, which is 9 times and 1.6 times than that of pure CeO2 and BHN/BiOIO3, respectively. Obviously, the CeO2/BHN/I--BiOIO3 double S-scheme heterojunctions significantly enhances its photocatalytic degradation ability of antibiotics in comparison to single-substance photocatalysts and simple two-phase composite. It is noteworthy that the CeO2/BHN/I--BiOIO3 double S-scheme heterojunctions are also capable of achieving a degradation rate of up to 70% for norfloxacin in river water. Furthermore, this double S-scheme heterojunctions demonstrate the degradation efficiencies of approximately 90% for quinolone antibiotics, including ofloxacin, enrofloxacin, ciprofloxacin, and norfloxacin. This research offers a novel approach to enhance the photocatalytic degradation of organic pollutants through double S-scheme heterojunctions and elemental modification.
A simple probe BHN based on naphthol and benzothiazole is reported for detecting of arginine (Arg) and lysine (Lys) with high selectivity and sensitivity. The BHN in aqueous solution upon reacting with Arg or Lys induced a visible color change from colorless to yellow. The probe BHN can also be employed for fluorescence turn-on sensing of Arg and Lys with the limits of detection (LOD) of 5.20 × 10 -2 μM and 3.69 × 10 -2 μM, respectively. The naked eye colorimetric and fluorimetric detecting is lack of sensitive to other common amino acids including Gly, Ala, Ser, Pro, Val, Thr, Cys, Leu, Ile, Asn, Asp, Glu, Gln, Met, His, and Phe. The sensing mechanism has been proposed by pH investigation and 1 H NMR spectra.
The development of non-noble metal catalysts with high activity and selectivity is critical for the electrocatalytic production of hydrogen peroxide (H 2 O 2 ). Herein, we report a composite catalyst (CTF/BHN) fabricated by chelating a basic bismuth salt (BHN) with a bipyridine-containing covalent triazine framework (CTF), forming strong Bi-bipyridine bonds at the interface. This catalyst exhibits exceptional H 2 O 2 selectivity (92–98 %) over a wide potential range (0.3–0.62 V vs. RHE). In H-type cell tests, it achieves a Faraday efficiency of 88.9 % at 20 mA cm −2 , with a high H 2 O 2 production rate of 1.65 mol g −1 h −1 , and maintains stable performance for 42 h. In-situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) and X-ray photoelectron spectroscopy (XPS) reveal that the superior performance stems from synergistic interfacial effects: electron transfer from BHN to CTF enhances charge transport, while polarized interfaces promote water dissociation and protonation of pyridine groups in CTF to form Py*H intermediates. Py*H acts as a proton relay, facilitating the protonation of adsorbed *O 2 to *OOH at Bi active sites. Concurrently, the enhanced interaction between *OOH and the catalyst surface (evidenced by the blue-shifted *OOH peak) stabilizes *OOH and suppresses its dissociation, thereby driving the 2e − ORR pathway for efficient H 2 O 2 generation.
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