A novel copper ion sensing periodic mesoporous organosilica (SCN-PMO) was obtained by incorporating a Schiff base-based fluorescent receptor into the pore walls of mesoporous silica, which exhibited a well ordered mesoporous structure and excellent optical properties demonstrated by various characterization results. SCN-PMO possessed high selectivity and sensitivity towards Cu 2+ based on its specific fluorescence response. The detection limit of SCN-PMO could be as low as 6.7 × 10 −7 M. Due to protection of the silica network, SCN chromophores in PMOs exhibited higher photostability and the resulting material possessed great repeatability. Additionally, the fluorescence changes of SCN-PMO towards copper ions in vivo (zebrafish) showed that SCN-PMO has potential application as a nanoprobe in biological fields.
In the process of rapid urban development, the following issue is the ecological environment problems. How to alleviate the contradiction between economic development and ecological environment and promote sustainable development has become a topic of wide concern. The ecological environment of a city is affected by many factors. Only by dealing with the environmental problems in urban construction can the environmental quality of the city be guaranteed and the sustainable development of the city be promoted. Based on the reality, this paper analyses the problems of urban ecological environment, and puts forward relevant strategies and suggestions for the sustainable development of urban ecological environment.
Mesoporous silica nanoparticles (MSNs) functionalized with benzimidazole‐derived fluorescent molecules (DHBM) are fabricated via a feasible interfacial superassembly strategy for the highly sensitive and selective detection of Cu2+. DHBM‐MSN exhibits an obvious quenching effect on Cu2+ in aqueous solutions, and the detection limit can be as low as 7.69×10−8 M. The DHBM‐MSN solid‐state sensor has good recyclability, and the silica framework can simultaneously improve the photostability of DHBM. Two mesoporous silica nanoparticles with different morphologies were specially designed to verify that nanocarriers with different morphologies do not affect the specific detectionability. The detection mechanism of the fluorescent probe was systematically elucidated by combining experimental results and density function theory calculations. Moreover, the detection system was successfully applied to detect Cu2+ in bovine serum, juice, and live cells. These results indicate that the DHBM‐MSN fluorescent sensor holds great potential in practical and biomedical applications.
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