Ag/CuO and Ag/ZnO incorporated ceramic membranes for enhanced oil water separatio

  • Amos Kwaku Avornyo

Student thesis: Master's Thesis

Abstract

Although ultrafiltration with ceramic membranes is a reliable method for separating oily water, it is hindered by membrane fouling. Therefore, this work focused on developing a new class of anti-fouling ceramic membranes. The antifouling property was achieved by surface hydrophilization of the ceramic membranes with hydrophilic silver-copper oxide (Ag-CuO) and silver-zinc oxide (Ag-ZnO) nanoparticles. The hydrophilization was intended to change the wettability of the membrane surface to have a selective affinity for the water molecules and repel the oil droplets. Different concentrations (0.1 wt. %, 0.5 wt. % and 1.0 wt.%) of the nanoparticles were used to prepare the metal-fused ceramic composite membranes, referred to as CERMET membranes, using the facile dip-coating method. The 0.5 wt. % coating resulted in optimal flux in both sets of membranes, with the Ag-CuO coated membranes having a slightly better overall separation performance (338 LMH/bar) than the Ag-ZnO coated membranes (322 LMH/bar). The coated membranes also showed high antimicrobial activity against Gram-positive and Gram-negative bacteria.
Date of AwardJul 2022
Original languageAmerican English

Keywords

  • Oily wastewater
  • ultrafiltration
  • TiO2/ZrO2
  • Ag-CuO
  • Ag-ZnO.

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