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Related Concept Videos

Biofilms01:29

Biofilms

Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: May 25, 2026

Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles
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Biogenic silver nanoparticles (bio-Ag 0) decrease biofouling of bio-Ag 0/PES nanocomposite membranes.

Manying Zhang1, Kaisong Zhang, Bart De Gusseme

  • 1Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.

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|February 15, 2012
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Biogenic silver nanoparticles embedded in polyethersulfone membranes effectively combat biofouling in water treatment. These advanced composite membranes show excellent antibacterial and anti-biofouling properties, reducing biofilm formation over nine weeks.

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Synthesis of Multi-walled Carbon Nanotubes Modified with Silver Nanoparticles and Evaluation of Their Antibacterial Activities and Cytotoxic Properties

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Nanotechnology

Background:

  • Biofouling significantly hinders membrane technology application in water and wastewater treatment.
  • Developing advanced anti-biofouling membrane materials is crucial for improving performance.

Purpose of the Study:

  • To investigate the incorporation of biogenic silver nanoparticles (bio-Ag(0)) into polyethersulfone (PES) membranes.
  • To evaluate the impact of bio-Ag(0) content on membrane structure, filtration performance, and anti-biofouling capabilities.

Main Methods:

  • Polyethersulfone (PES) membranes were fabricated using the phase-inversion method with varying amounts of biogenic silver nanoparticles (bio-Ag(0)).
  • Membrane structure, hydrophilicity, and permeate flux were analyzed.
  • Antibacterial activity was tested against Escherichia coli and Pseudomonas aeruginosa.
  • Anti-biofouling properties were assessed using an activated sludge bioreactor over a 9-week period.

Main Results:

  • Silver-containing nanostructures were uniformly distributed on the membrane surface.
  • Bio-Ag(0) incorporation enhanced membrane hydrophilicity and increased permeate flux.
  • Composite membranes demonstrated excellent antibacterial activity and significantly reduced bacterial attachment and biofilm formation.

Conclusions:

  • Biogenic silver nanoparticles effectively enhance the anti-biofouling performance of PES membranes.
  • Even low concentrations of bio-Ag(0) provide substantial protection against bacterial adhesion and biofilm development.
  • These bio-Ag(0)/PES composite membranes show great promise for water and wastewater treatment applications.