Volume 17 Issue 2
Jun.  2024
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Hamidatu Alhassan, Ying Woan Soon, Anwar Usman, Voo Nyuk Yoong. 2024: Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment. Water Science and Engineering, 17(2): 139-149. doi: 10.1016/j.wse.2023.09.003
Citation: Hamidatu Alhassan, Ying Woan Soon, Anwar Usman, Voo Nyuk Yoong. 2024: Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment. Water Science and Engineering, 17(2): 139-149. doi: 10.1016/j.wse.2023.09.003

Ultrahydrophobic melamine sponge via interfacial modification with reduced graphene oxide/titanium dioxide nanocomposite and polydimethylsiloxane for oily wastewater treatment

doi: 10.1016/j.wse.2023.09.003
Funds:

This work was supported by the Universiti Brunei Darussalam Research Funding (Grant No.UBD/OAVCRI/CRGWG (022)/171001).

  • Received Date: 2023-03-20
  • Accepted Date: 2023-08-29
  • Available Online: 2024-05-14
  • Three-dimensional (3D) porous absorbents have attracted significant attention in the oily wastewater treatment technology due to their high porosity and elasticity. Given their amphiphilic surface, they have a propensity to simultaneously absorb water and oil, which restricts their range of applications. In this study, a reduced graphene oxide and titanium dioxide nanocomposite (rGO/TiO2) was used to fabricate an ultrahydrophobic melamine sponge (MS) through interfacial modification using a solution immersion technique. To further modify it, polydimethylsiloxane (PDMS) was grafted onto its surface to establish stronger covalent bonds with the composite. The water contact angle of the sponge (rGO/TiO2/PDMS/MS) was 164.2°, which satisfies the condition for ultrahydrophobicity. The evidence of its water repellency was demonstrated by the Cassie-Baxter theory and the lotus leaf effect. As a result of the increased density of rGO/TiO2/PDMS/MS, it recorded an initial capacity that was 2 g/g lower than the raw MS for crude oil absorption. The raw MS retained 53 % of its initial absorption capacity after 20 cycles of absorption, while rGO/TiO2/PDMS/MS retained 97 %, suggesting good recyclability. Excellent oil and organic solvent recovery (90 %-96 %) was demonstrated by rGO/TiO2/PDMS/MS in oil-water combinations. In a continuous separation system, it achieved a remarkable separation efficiency of 2.4×106 L/(m3·h), and in turbulent emulsion separation, it achieved a demulsification efficiency of 90 %-91 %. This study provides a practical substitute for massive oil spill cleaning.

     

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