Silver-Incorporated Mussel-Inspired Polydopamine Coatings on Mesoporous Silica as an Efficient Nanocatalyst and Antimicrobial Agent

Abstract

To tackle severe environmental pollution, a search for materials by economical and eco-friendly preparations is demanding for public health. In this study, a novel in situ method to form silver nanoparticles under mild conditions was developed using biomimetic reducing agents of polydopamine coated on the rodlike mesoporous silica of SBA-15. The synthesized SBA-15/polydopamine (PDA)/Ag nanocomposites were characterized by a combination of physicochemical and electrochemical methods. 4-Nitrophenol (4-NP) and methylene blue (MB) were used as models for the evaluation of the prepared nanocatalysts of SBA-15/PDA/Ag in which the composite exhibited enhanced catalytic performance toward degrading 4-NP in solution and MB on the membrane, respectively. Additionally, compared with that of solid core-shell SiO/PDA/Ag, tubular SBA-15/PDA/Ag showed the prolonged inhibitory effect on microbial growth as typified by Escherichia coli (60 h), Staphylococcus aureus (36 h), and Aspergillus fumigatus (60 h), which demonstrated efficient control of silver nanoparticles release from the mesopores. The constructed dual-functional SBA-15/PDA/Ag as the long-term antimicrobial agent and the catalyst of industrial products provides an integrated nanoplatform to deal with environmental concerns.

Multifunctional Bismuth-Based Materials for Heavy Metal Detection and Antibiosis

“…The underlying antimicrobial mechanism of bismuth-based materials can be further studied using radical-sensitive fluorescent dyes. The generation of free radicals has been considered as one of the causes of metal particle-induced cytotoxicity in bacteria [29]. Therefore, the cytotoxicity of BiOCl-KIT-6 composite may be linked to the formation of reactive oxygen species (ROS).…”

Mesoporous Silica‐Based Materials with Bactericidal Properties

“…Chen and co-workers prepared SBA-15 MS microparticles decorated with AgNPs. [238] The authors adsorbed dopamine onto the surface of the mesoporous scaffold by electrostatic interactions and then silver nitrate was added to coordinate Ag(I) ions with de catechol subunit of the dopamine. The suspension at pH 8.5 was heated at 80 °C for 12 h in order to reduce Ag(I) ions forming AgNPs.…”

Surface Decorated Mesoporous Silica Nanoparticles: A Promising and Emerging Tool for Cancer Targeting

“…68 They can also serve as useful nanocatalyst and antimicrobial agent. 69 PDA-MSNs are responsive to pH stimulus and hence can act as an effective anticancer agent. The PDA coating works as an effective gatekeeper for time bound pH sensitive controlled release of drug.…”