Facile synthesis of xanthan biopolymer integrated 3D hierarchical graphene oxide/titanium dioxide composite for adsorptive lead removal in wastewater

Kar Chiew Lai, Lai Yee Lee*, Billie Yan Zhang Hiew, Suchithra Thangalazhy-Gopakumar, Suyin Gan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (SciVal)

Abstract

Xanthan integrated graphene oxide functionalized by titanium dioxide was successfully prepared through facile, eco-friendly and cost effective ice-templating technique. The three-dimensional (3D) graphene composite demonstrated relatively high temperature stability, chemical functionalities and porous sponge-like structure. The adsorption of lead was favored by high initial concentration and shaking speed at the operational solution pH. The process equilibrium and kinetic adhered to the Langmuir and pseudo-second-order correlations, respectively. The biomass integrated graphene composite showed maximum adsorption capacities ranging from 132.18 to 199.22 mg/g for 30–70 °C. Moreover, it was highly regenerable under mild conditions (0.1 M hydrochloric acid, 30 °C) and used repeatedly while retaining 84.78% of its initial adsorption capacity at the fifth adsorption-regeneration cycle. With comparatively high lead adsorption capacities, adequate recyclability and environmentally friendliness, the as-prepared 3D graphene composite has high application potential in heavy metal-wastewater separation for protection of the environment and human health.

Original languageEnglish
Article number123296
JournalBioresource Technology
Volume309
Early online date6 Apr 2020
DOIs
Publication statusPublished - Aug 2020

Keywords

  • 3D graphene/titanium oxide
  • Equilibrium and kinetic
  • Lead adsorption
  • Regeneration
  • Xanthan biopolymer

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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