Interlayered modified hydroxides for removal of graphene oxide from water: Mechanism and secondary applications

Ajmal Shahzad, Jawad Ali, Muhammad Wajid Ullah, Gebremedhin G. Aregay, Jerosha Ifthikar, Sehrish Manan, Guang Yang, Zhulei Chen, Zhuqi Chen

Research output: Journal PublicationArticlepeer-review

6 Citations (Scopus)


The extensive use and inevitable release of graphene oxide (GO) to the environment have increased the threat of its exposure to living organisms. This study reports the design of Fe-based hydroxides with different interlayers anions, i.e., Cl, SO42−, CO32−, and NO3 to capture GO from an aqueous medium. Various characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM), confirmed the successful synthesis of these different materials. The Fe-hydroxides as Fe-HO/(NO3) with NO3 interlayers anions effectively removed up to 190 mg/g GO and was tolerant to a high concentration of background electrolyte, different anions, and increasing ionic strength. These remarkable features of Fe-HO/(NO3) originated from the weak bonding abilities of interlayers NO3 anions that facilitated simple self-exfoliation of hydroxide nanosheets, and thus promoted the electrostatic interactions between the positively charged layers of hydroxides and negatively charged GO particles. The coagulated end product (Fe-HO/(NO3)@GO can be further used in advanced oxidation processes (AOPs) as catalyst or adsorbent for the treatment of different pollutants. We believe that this work not only explains the positive aspect of regulating anions in the hydroxides layers but also provides a direction to develop new materials for environmental remediation.

Original languageEnglish
Article number120305
JournalSeparation and Purification Technology
Publication statusPublished - 1 Feb 2022
Externally publishedYes


  • Coagulation
  • Emerging contaminants
  • Graphene oxide
  • Layered hydroxides
  • Secondary applications

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation


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