Recyclable Mussel-Inspired Magnetic Nanocellulose@Polydopamine–Ag Nanocatalyst for Efficient Degradation of Refractory Organic Pollutants and Bacterial Disinfection

Abstract

Development of a novel strategy to tackle bacterialcontaminated complex industrial wastewaters containing refractory organic pollutants is of great demand. In this study, polydopamine (PDA)-coated magnetic cellulose nanofiber (MCNF)-loaded silver nanoparticle (AgNP) (MCNF/PDA−Ag) nanocomposites were designed and applied for efficient degradation of organic dye pollutants and inactivation of Escherichia coli (E. coli) in wastewater. In the presence of NaBH 4 , MCNF/PDA−Ag could achieve a high catalytic reduction rate of 6.54 min −1 for the removal of methylene blue. Similarly, it showed good catalytic reduction performance for methyl orange (0.63 min −1 ) and 4nitrophenol (2.94 min −1 ). The MCNF/PDA−Ag nanocomposites can be easily magnetically recycled and reused with negligible loss of catalytic performance. Moreover, this nanocatalyst also exhibited excellent disinfection performance against E. coli, with more than 99% disinfection ratio at very low doses (50 μg/mL). Overall, this work provides new insights into a delicate design of advanced magnetically recyclable silver nanocomposites with ultrahigh catalytic rates and excellent antibacterial properties from sustainable nature biomass.

Electrospray Preparation of Robust Aramid Nanofiber Microbead Adsorbents for Wastewater Treatment

“…The adsorption isotherm is the basis for describing the interaction between the adsorbent and the adsorbate, which is essential for a reasonable assessment of the adsorption efficiency of the adsorbent used. Common isotherms include the Langmuir adsorption isotherm and the Freundlich adsorption isotherm. − As shown in Figure a,b and Table , the experimental data is fitted to adsorption isotherm models, and the Langmuir adsorption model exhibits higher correlation coefficient ( R 2 ) values than those of the Freundlich model. The theoretical maximum adsorption capacity (267.4 mg/g) closely matches the experimental equilibrium adsorption capacity (265.4 mg/g).…”

2D/0D multiscale interfacial engineering of carbon fiber composites for simultaneous achieving high mechanical and electromagnetic interference shielding properties

“…27 Researches show that PDA exhibits reducibility, making it a valuable candidate for preventing the oxidation of AgNPs, ensuring their stable anchoring on the substrate. 28,29 Moreover, the surface-active functional groups of PDA facilitate the formation of hydrogen bonds and metal coordination with Ag. 30 However, due to the AgNPs on the surface of carbon fibers are interconnected in a point-to-point mode, which would lead to an unstable conductive contact mode.…”

“…Zhang et al introduced a CF/epoxy composite by employing polydopamine (PDA) to facilitate the deposition of AgNPs onto the carbon fiber surface 27 . Researches show that PDA exhibits reducibility, making it a valuable candidate for preventing the oxidation of AgNPs, ensuring their stable anchoring on the substrate 28,29 . Moreover, the surface‐active functional groups of PDA facilitate the formation of hydrogen bonds and metal coordination with Ag 30 .…”

Mussel-inspired PDA/Ag nanocomposite catalyst for highly-efficient Cr(vi) removal via visible light-induced reduction and absorption

“…37 Since a good deal of hydroxyl and amino groups exist in PDA, it is known for its unique adhesion behavior with inorganic (heavy metals ions, metal solids, and so on) and organic compounds via hydrogen bonds, coordination bonds, covalent bonds, ion bonds, and p-p stacking interactions. [38][39][40][41] Great attention has been drawn to coat PDA onto various semiconductors due to its good electrical conductivity. 42,43 The separation of photogenerated charges could be improved and therefore enhance the photocatalytic efficiency.…”