具有可控释放能力和可抑制生物膜形成的聚多巴胺/银杂化涂层的钠钙玻璃球

过滤介质作为过滤装置中的关键材料可改变流经其中的水的质量.正确选择过滤介质对于过滤装置的过滤性能至关重要.再生玻璃作为介质过滤装置中硅砂的替代品,具有比硅砂廉价、环境友好、可再生等优点,并且可以根据特定的设计要求将其粉碎成不同的尺寸.然而,水中存在大量的诸如细菌和藻类的微生物,故再生的可循环玻璃介质的过滤效率受到在其表面富集的生物膜的极大限制.本研究中,我们通过在钠钙玻璃球(GS)表面上进行氢氟酸(HF)蚀刻和原位结晶制备了用聚多巴胺(PDA)和银(Ag)纳米颗粒改性的氢氟酸蚀刻玻璃球(PDA-Ag-HF/GSs).银晶体的原位生长、HF蚀刻和PDA涂层的改性赋予了PDA-Ag-HF/GS良好的亲水性.银涂层的改性还使得PDA-Ag-HF/GS具有出色的抗菌性能和较小的球藻附着力,且通过释放Ag离子可抑制微生物的生长.PDA涂层上的邻苯二酚官能团可通过螯合作用调节Ag离子的释放.良好的抗菌性能、抗藻类附着力和Ag离子的受控释放表明,PDA-AgHF/GS涂层可有效抑制材料表面生物膜的形成,为抗生物膜的形成提供了新的策略.

Polydopamine/silver hybrid coatings on soda-lime glass spheres with controllable release ability for inhibiting biofilm formation

Filtering media is anything placed in a filter that changes the quality of water flowing through it.With the variety of media available,proper selection of filter media is of great importance for filter performance.Recycled glass is evaluated as an alternative to silica sand in media filters and is an effective medium with the advantages of lower cost than silica sand,more environmental friendliness as it is a recycled product,and ease to pulverize into different sizes for specific design requirements.However,the filtration efficiency of regenerated recycled glass is limited by the formation of biofilms on its surfaces due to the large number of microorganisms such as bacteria and algae existing in the water.In this study,hydrofluoric(HF)acid etched glass spheres(GSs)modified with polydopamine(PDA)and silver nanoparticles(PDA-AgHF/GSs)were fabricated on the surface of soda-lime GSs by HF etching,crystal in situ growth,and PDA coating.HF etching and the modification of PDA coating imparted good hydrophilicity to PDA-Ag-HF/GSs.The modification of the silver coating also rendered PDA-Ag-HF/GSs excellent antibacterial properties and reduced Chlorella adhesion,and inhibited microorganism growth ability by releasing Ag^+.The catechol functional group on the PDA coating could regulate the Ag^+release by chelation.Good antibacterial properties,anti-algae adhesion,and controlled release of Ag^+indicate that PDA-Ag-HF/GS coating can effectively inhibit the formation of biofilm on the surface of the material,providing a new strategy for the formation of anti-biofilm.