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In this work, indium tin oxide(ITO)/tin oxide(SnO2)/titanium dioxide(TiO2)/gold nanoparticles(Au NPs) nanocomposite electrode(ITO/SnO2/TiO2/Au NPs) was prepared and used to develop a photoelectrochemical(PEC) method for the selective detection of sialic acid(SA). Firstly, ITO/SnO2 electrode was prepared by spin coating method, and then TiO2 nanofibers and Au NPs were synthesized on the surface of ITO/SnO2 by electrospinning and magnetron sputtering. Compared with pure SnO2, the photoelectric performance of ITO/SnO2/TiO2/Au NPs nanocomposite electrode is significantly improved. This may be closely related to the local plasmon resonance effect(LSPR) of Au NPs, and the synergistic effect between TiO2/SnO2 heterojunction. After that, 4-mercaptophenylboronic acid (4-MPBA) was modified on the surface of ITO/SnO2/TiO2/Au NPs electrode by Au-S bond, and a PEC sensing platform was developed to specifically detect SA by non-specific esterification reaction between 4-MPBA and SA.

Gold nanoparticles(Au NPs)-sensitized tin dioxide (SnO2) semiconductor not only broadens the visible light absorption range of the material, but also easily forms a Schottky barrier at the heterogeneous interface, which effectively promotes the separation of photogenerated e-/h+ and improves the sensitivity of the sensor. This work explored the one-step synthesis method to prepare SnO2@Au NPs heterogeneous materials, which have high photoelectric conversion efficiency and show better photoelectric properties. Based on the uniformity and firmness of this nanocomposite, the recognition layer can be modified on its surface to construct a "sandwich" biosensor with a sandwich structure to realize the specific photoelectric determination of calprotectin(CP). The linear range is 0.01-20.00 μg·mL-1, the detection limit is as low as 3.2 ng·mL-1, and the specificity is good and stable. In addition, the sensor has also been successfully used to detect CP in actual blood samples and obtained a good recovery rate, which could realize rapid and non-invasive detection of CP.

The Class A1 flame retardant eco-material with excellent comprehensive properties is strongly needed to replace the low-level flame retardant products for potential applications in the building industry. In this work, modified titanium sol with the re-dispersible latex powder (VAE) is compounded to prepare non-combustible flame retardant composites. The optimal content of polylactic acid (PLA) is determined as 10 wt%. The results reveal that the addition of modified titanium sol has simultaneous improvements in flame resistance, water resistance, and mechanical properties of the composite material. The composites with 8 wt% modified titanium sol show low gross heat of combustion (0.646 MJ·kg−1) and low water absorption (4.26%), satisfying the enterprise standards. Besides, the flexural strength of the composites exhibited the maximum at 18.8 MPa. Structure observation discloses that the modified titanium sol promotes the formation of a three-dimensional network structure in the material and further forms a dense protective layer during combustion to inhibit burning. Overall results suggest that the composites with modified titanium sol as the Class A1 flame retardant composite will shed light on their promising applications in the construction industry.

Reclamation changes the characteristics of water movement, then affects the marine environment system, and may even lead to environmental disasters. The influence on the 4 aspects of the current field, wave field, suspended sediment field and topography were summarized. Impacts of large area of reclamation project on the marine environment are found very few, and to expand the study scope and make up for the current lack of a wide range of studies on multiple reclamation impacts on the marine environment is an important research direction in the future; In the long time scale, it is a lack of long-term cumulative effects on coastal reclamation and whether the influence can restore; the present study focuses only on the impact evaluation of scope, type, and degree from lack of exploring the potential mechanism; It is a lack of interdisciplinary research, and the analysis of comprehensive influence of reclamation projects on land, sea and biological and ecological environment.