Membrane and Water Treatment

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Effect of post-treatment routes on the performance of PVDF-TEOS hollow fiber membranes

  • Shadia R. Tewfik (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Mohamed H. Sorour (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Hayam F. Shaalan (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Heba A. Hani (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Abdelghani G. Abulnour (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Marwa M. El Sayed (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Yomna O. Mostafa (Mechanical Engineering Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Mahmoud A. Eltoukhy (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre)
  • Received : 2022.09.15
  • Accepted : 2023.04.24
  • Published : 2023.03.25
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Abstract

Membrane separation is widely used for several applications such as water treatment, membrane reactors and climate change. Cross-linked organic-inorganic hybrid polyvinylidene fluoride (PVDF) / Tetraethyl orthosilicate (TEOS) was adopted for the preparation of optimized hollow membrane (HFM) for membrane distillation or other low pressure separators for mechanical properties and permeability under varying pretreatment schemes. HFMs were prepared on semi-pilot membrane fabrication system. Novel adopted post-treatment schemes involved soaking in glycerol, magnesium sulphate (MgSO4), sodium hypochlorite (NaOCl), and isopropanol for different durations. All fibers were characterized for morphology using a scanning electron microscope (SEM), surface roughness using atomic force microscope (AFM), elemental composition by examining Energy Dispersive Spectroscopy (EDS), water contact angle (CA°) and porosity. The performance of the fibers was evaluated for pure water permeation flux (PWF). Post-treatment with MgSO4 gave the highest both tensile modulus and flux. Assessment of properties and performance revealed comparable results with other organic-inorganic separators, HF or flat. In spite of few reported data on post treatment using MgSO4 in presence of TEOS, this proves the potential of low cost treatment without negative impact on other membrane properties. The flux is also comparable with hypochlorite which manifests substantial precaution requirements in actual industrial use.The relatively high values of flux/bar for sample treated with TEOS, post treated with MgSO4 and hypochlorite are 88 and 82 LMH/bar respectively.

Keywords

Acknowledgement

The authors are grateful to the Ministry of International Cooperation for securing the funds to initiate the National Research Centre's Hollow Fiber Membranes Program from the Islamic Development Bank and Kuwait Fund for Arab Economic Development. This work is funded by Science and Technology Development Fund, STDF, Ministry of Scientific Research, Egypt, Project No. 30280 entitled "Development of a Solar Powered, Zero Liquid Discharge Integrated Desalination Membrane System to Address the Needs for Water of the Mediterranean Region", within the scope of ERANETMED program ID 2-72-357

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