Xiashi Zhu

Diazole ring (AP)-doped g-C3N4 (APCN-X) was synthesised via thermal polymerisation. Persulfate-assisted(PMS) photocatalytic tetracycline degradation system based on APCN-X under visible light was constructed. Results showed that the photocatalytic degradation rate of Tetracycline(TC) by the APCN-30/PMS/Vis system was 91.84%/100min (compared to 69.35% for g-C3N4(CN) /PMS/Vis), which was 5.24 times higher than that of CN/PMS/Vis. The possible mechanism of APCN-30 enhanced the photocatalytic activity of PMS was discussed.

A g-C3N4/V2C composite with Schottky junction was prepared by self-assembly method. Due to the lower Fermi level of V2C, it can form a Schottky junction with g-C3N4, inhibiting the recombination of electron-hole pairs, thereby enhancing the photocatalytic performance. Under light irradiation, CNV-1% achieves a degradation rate of 91.24% for MG within 90 min, and maintains high stability after five cycles; CNV-1% exhibits both dark adsorption and photocatalytic performance for MG under alkaline conditions. Moreover, the composite also shows certain degradation effects on other pollutants, indicating universality, which further broadens the application of V2C-based materials in photocatalytic degradation.

The influence of achiral surfactants on synergistically chiral effect of interfacial nucleation, assembly orientation, and morphological evolution in chiral nanostructural synthesis via a chemical solution method is largely ignored and underexplored. Herein, we report a surfactant-mediated continuous evolution of chiral Cu_2-xS (0 < x < 1) from layered nanosheets to twisted nanobowties (TNBs) and uncovered a multiscale chirality amplification mechanism driven by tilted stacking of coordination nanosheets. Surfactant identity, including headgroup and alkyl chain length, controls the potential, adsorption strength, and density, as well as tail packing of interfacial layers formed by Cu²⁺-cysteine coordination units, thereby directing their assembly pathway. In particular, in sodium dodecyl sulfate, the anionic headgroups electrostatically anchor coordination-derived nanoparticles, while the hydrophobic tails form a dense interfacial soft-template that directs nucleation and anisotropic growth of coordination nanosheets. Under the stereochemical control of chiral cysteine, these nanosheets undergo progressive intersheet tilting and hierarchical stacking, ultimately evolving into micrometer-scale TNBs. Catalytic oxidation of 3,4-dihydroxy-l/d-phenylalanine reveals that higher structural dimensionality and increased chiroptical response of Cu_2-xS improve catalytic activity and enantioselectivity. This work demonstrates a surfactant-mediated interfacial soft-template strategy for the rational design of chiral inorganic materials and the translation of molecular asymmetry into continuously tunable micrometer-scale architectures for enantioselective catalysis.

Broken hollow porous tubular carbon nitride (MPCN) was synthesized by incorporating 3-methyl-2,4-pentanedione (MP) into the carbon nitride (CN) skeleton, using a simple thermal copolymerization method. The permethionate (PMS)-assisted photocatalytic degradation system based on MPCN was constructed for the degradation of tetracycline (TC). The results showed that MPCN-35/PMS/Vis presented excellent degradation performance and stability for TC, degrading 96.54% of TC within 120 min, being 3.45 folds of CN/PMS/Vis. The mechanism of enhanced PMS-assisted photocatalytic degradation of TC was proposed: (1) The conjugated structure of CN was extended by introducing the enol structure, which accelerated the electron migration. (2) The active species ( ¹ O ₂ and h[ ]) played a crucial role in MPCN-35/PMS/Vis system to degrade TC.

A sensitive and selective fluorescence sensor for rutin was successfully developed. The sensor was fabricated from highly fluorescent nitrogen-boron co-doped carbon quantum dots (N,B-CDs) coated with mesoporous silica molecularly imprinted polymer (MIP). Rutin was detected by this sensor (N,B-CDs @ MIP) with a linear range of 0.08–30 μM and a detection limit as low as 0.05 μM, under optimal conditions. Meanwhile, the usefulness of the developed sensor was evaluated in samples of lake water, orange, and honey with satisfactory recoveries. Graphical Abstract

Antioxidants are essential for preventing cellular and organ damage caused by reactive oxygen species (ROS). Consequently, the total antioxidant capacity (TAC) of food products was a critical criterion for assessing their quality. This study presented a novel dual-mode, four-channel sensor array platform for the highly sensitive detection of TAC, which employed the exceptional dual enzyme activity of mesoporous silica nanoparticles loaded with iron and nitrogen codoped carbon quantum dots (Fe,N-CQDs@MSNs) through pattern recognition methods. The dual-enzyme-like nanocatalysts exhibited: (1) Peroxidase-like activity in which Fe,N-CQDs@MSNs facilitated the activation of H₂O₂, yielding hydroxyl radicals (^•OH); and (2) photoresponsive oxidative activity, where Fe,N-CQDs@MSNs generated ^•OH, superoxide anions (^•O₂^-), and singlet oxygen (¹O₂) under UV light at 365 nm. These ROS oxidized 3,3',5,5'-tetramethylbenzidine (TMB) from colorless to blue, accompanied by fluorescence quenching in Fe,N-CQDs@MSNs. Upon adding four antioxidants ascorbic acid (AA), glutathione (GSH), cysteine (Cys), and dopamine (DA), the reactive intermediates were eliminated to varying degrees, leading to distinct UV and fluorescence responses as specific "fingerprints" for the sensor array. Multivariate statistical approaches, including principal component analysis (PCA) and hierarchical clustering analysis (HCA), enabled the distinct classification of the four antioxidants, achieving a detection limit of 1 μM. Additionally, the sensor array enabled the identification of varying concentrations of individual antioxidants as well as mixtures in different proportions. Finally, the proposed method was effectively employed for the quantitative determination of TAC in diverse food samples, yielding satisfactory results and demonstrating its potential for TAC detection in food products.

This review mainly summarises the progress in the preparation methods of organic compound/g-C ₃ N ₄ . Various materials such as different types of organic compound/g-C ₃ N ₄ composites and their related energy and environmental applications are discussed.

In this paper, the amino acid chiral ionic liquid (AACIL) was prepared with L‐phenylalanine and imidazole. It was characterized by CD, FT‐IR, ¹H NMR, and ¹³C NMR spectrum. The chiral recognition sensor was constructed with AACIL and Cu(II), which exhibited different chiral visual responses (solubility or color difference) to the enantiomers of glutamine (Gln) and phenylalanine (Phe). The effects of solvent, pH, time, temperature, metal ions, and other amino acids on visual chiral recognition were optimized. The minimum concentrations of Gln and Phe for visual chiral recognition were 0.20 mg/ml and 0.28 mg/ml, respectively. The mechanism of chiral recognition was investigated by FT‐IR, TEM, SEM, TG, XPS, and CD. The location of the host‐guest inclusion or molecular placement has been conformationally searched based on Gaussian 09 software.

A novel method for chiral identification of glutamine enantiomers based on chiral carbon quantum dots (cCQDs) fluorescent probes. cCQDs were prepared using a one‐step hydrothermal method with L‐tryptophan as the carbon source and chiral source, producing spherical nanoparticles exhibiting a blue colour luminescence. The fluorescence intensity (F) of cCQDs was enhanced or quenched following the addition of chiral enantiomeric glutamine (L/D‐Gln), and therefore cCQDs, as a fluorescence probe, could be used for enantioselective sensing of the L/D‐Gln. The fluorescence enhancement value (∆F_E) exhibited good linearity with L‐Gln concentration in the range 0.23–10.00 mM, and the limit of detection was 0.14 mM. The fluorescence quenching value (∆F_Q) showed a good linear relationship with D‐Gln concentration in the range 0.29–10.00 mM, and the detection limit was 0.18 mM. The mechanism of fluorescence enhancement/quenching was explored by molecular modelling and the type of quenching. The method was applied to the determination of L‐Gln content in real samples, and the recovery rate was satisfactory. This study provided a novel approach for the synthesis of cCQDs and the recognition of amino acid enantiomers.