In this study, we employed an interfacial engineering strategy to construct a hierarchical heterojunction, ZIF-8/g-C₃N₄/CTAB (denoted as ZGC), in situ on a g-C₃N₄ substrate. The g-C 3 N 4 , synthesized via the urea pyrolysis method, served as a structural template, with its unique electronic structure and surface properties facilitating the separation and migration of photogenerated charge carriers. Upon dispersion in methanol, it functioned as a coordination reaction medium, directing the oriented nucleation of the ZIF-8 crystalline phase on its surface through hexahydrate zinc nitrate and 2-methylimidazole, facilitated by CTAB, culminating in a distinctive “core-shell” structure that enhances photocatalytic activity. This heterojunction demonstrated remarkable spectral adaptability: within a 30 ppm tetracycline hydrochloride degradation system (0.5 g/L catalyst), the degradation rates achieved under ultraviolet, blue laser, and visible light were 97.79 %, 95.38 %, and 94.48 %, respectively, within a 120-min period. The purpose of this comparison is to investigate the impact of different light sources on photocatalytic activity, thereby providing a theoretical basis for the selection of light sources in practical applications. We have made a novel discovery concerning wavelength-controlled reaction pathways, which offers a pioneering paradigm for interfacial engineering in the development of spectrally adaptive catalysts for environmental remediation.
An Electrochemical nonenzymatic sensor was fabricated based on cetyltrimethylammonium bromide (CTAB), chitosan (Chit) and carbon nanotube (CNT) nanocomposite modified glassy carbon electrode. Scanning electron microscopy morphology showed that CNT well dispersed in Chit, while CTAB micelles assembled on the surface of the CNT. Due to the synergetic effect of the three components, excellent electrocatalytic activity towards the oxidation of hydroxymethanesulfinate (HMS) in the presence of both fixed and varying concentrations of sulfite was achieved. An enhanced peak current and expanded peak-to-peak separation between HMS and sulfite was observed. Differential pulse voltammetry was applied to quantify HMS and the calibration curve was linear in the range of 30–800 µM with a detection limit of 9.6 µM. The method was applied in the determination of HMS in food samples collected from local markets, and the results have no remarkable difference with the reference HPLC method.
The authors describe an electrostatic self-assembly strategy for the modification of a glassy carbon electrode (GCE) with CdTe quantum dots (QDs), cetyltrimethylammonium bromide, chitosan, and multiwalled carbon nanotubes (MWCNTs). The nanocomposite was characterized by scanning electron microscopy revealing the distribution of spherically shaped CdTe QDs on the tubular networks of the MWCNTs. The modified GCE is shown to enable improved voltammetric sensing of nitrite, best at a working potential of 0.78 V (vs. SCE). The synergetic effect of the four components leads to rapid electron transfer and in an increased active area. Hence, excellent electrocatalytic activity towards the oxidation of nitrite is observed. Square wave voltammetry was applied to quantify nitrite, and the two linear ranges cover the 1 to 100 μmol L −1 and 100 to 600 μmol L −1 nitrite concentration ranges. The detection limit is 0.30 μmol L −1 . The method was applied to the determination of nitrite in pickled vegetables and the results were compared to a UV-Vis method. The method is found to be sensitive, accurate, rapid, and well repeatable.
Schematic illustration of the procedure of the modification of a glassy carbon electrode (GCE) with CdTe quantum dots (QDs), cetyltrimethylammonium bromide (CTAB); chitosan (Chit) and multiwalled carbon nanotubes (MWCNTs).
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