Green one-step synthesis of ZnO/cellulose nanocrystal hybrids with modulated morphologies and superfast absorption of cationic dyes

Int J Biol Macromol. 2019 Jul 1:132:51-62. doi: 10.1016/j.ijbiomac.2019.03.104. Epub 2019 Mar 25.

Abstract

Zinc oxide/cellulose nanocrystal (ZnO/CNC) hybrids with modulated morphologies were prepared by using bamboo CNC as templates via green one-step technique. The effect of pH values on the morphology, microstructure, thermal stability, antibacterial efficiency and dye absorption kinetics of hybrids were investigated. A possible mechanism for various hybrid morphologies at different pH values was provided. All the samples exhibited high antibacterial ratios of 91.4%-99.8% against both Escherichia coli and Staphylococcus aureus. ZnO/CNC8.5 gave quick removal efficiency with high dye removal ratios in methylene blue (MB, 93.55%) and malachite green (MG, 99.02%), especially >91.47% and 97.85% within 5 min. The absorption capacity could reach up to 46.77 mg/g for MB and 49.51 mg/g for MG. Besides, absorption kinetics showed that the absorption behavior followed the pseudo-second-order kinetic model (R2 > 0.99996). Such ZnO/CNC hybrids show outstanding and low-cost adsorbent for efficient absorption of cationic dyes in wastewater treatment field.

Keywords: Cationic dye absorption; Morphological modulation; ZnO/cellulose nanocrystal hybrids.

MeSH terms

  • Absorption, Physicochemical*
  • Anti-Bacterial Agents / chemistry*
  • Anti-Bacterial Agents / pharmacology
  • Cellulose / chemistry*
  • Chemistry Techniques, Synthetic
  • Coloring Agents / chemistry*
  • Coloring Agents / isolation & purification*
  • Escherichia coli / drug effects
  • Green Chemistry Technology
  • Hydrogen-Ion Concentration
  • Kinetics
  • Methylene Blue / chemistry
  • Methylene Blue / isolation & purification
  • Nanoparticles / chemistry*
  • Rosaniline Dyes / chemistry
  • Rosaniline Dyes / isolation & purification
  • Staphylococcus aureus / drug effects
  • Temperature
  • Wastewater / chemistry
  • Water Purification
  • Zinc Oxide / chemistry*
  • Zinc Oxide / pharmacology

Substances

  • Anti-Bacterial Agents
  • Coloring Agents
  • Rosaniline Dyes
  • Waste Water
  • malachite green
  • Cellulose
  • Zinc Oxide
  • Methylene Blue