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Application of ceramic microfiltration membrane modified by nano-TiO2coating in separation of a stable oil-in-water emulsion

Journal of Membrane Science
DOI: 10.1016/j.memsci.2014.01.029
  • Microfiltration Membrane
  • Hydrophilic Modification
  • Oil-In-Water Emulsion
  • Nano-Tio2Coating
  • Oil–Water Separation


Abstract Hydrophilic modification of the commercial ceramic microfiltration membranes is processed by the nano-TiO2 coating. The nano-coating does not form a separation layer but increases the hydrophilic character of membrane surface. The modified microfiltration membranes are used to treat stable oil-in-water emulsions. The results show that the ceramic membrane modified by 2mol/L Ti(SO4)2 solution is the more suitable in the MF process. Under the following operation conditions: cross-flow velocity of 5m/s, trans-membrane pressure of 0.16MPa, feed temperature of 40°C, the modified membrane has the better stable flux, which is higher than that of the unmodified one. The oil concentration of the filtrate is no more than 10mg/L if the oil concentration of the feed is not higher than 4g/L due to the existence of the hydrophilic nano-TiO2 coating, indicating the modified ceramic microfiltration membrane can be directly applied in the treatment of a stable oil–water emulsion.

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