Synthesis and characterization of phase inversion membrane with MoS₂
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Qiu, Sihan
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Abstract
The aim of the project is to synthesize and characterize phase inversion membrane with MoS₂ and find the best way to reach its best performance.
MoS₂ is used as a nanocomposite to improvement membrane performance. MoS₂ can increase the water flux at an early stage when MoS₂ concentration is approaching 0.05% in FO and 0.1% in PRO under 1M or 2M sodium chlorine solution. Additional addition of MoS₂ can no longer increase the water flux because aggregated nanocomposites block part of pores in membrane. A membrane under higher osmotic pressure requires higher MoS₂ concentration to reach its best water flux.
The addition of MoS₂ into the membrane can affect reverse salt flux much greater than water flux. Even a small loading of MoS₂ can reduce reverse salt flux greatly compared to membrane without addition.
Membrane with MoS₂ has Mo part with a hydrophilic entrance and a tight center while S part with a hydrophobic entrance and an expanding center. An appropriate irregularity can help improve the performance of the membrane, but membrane with extra irregularity will lead to a decrease in water flux. The higher concentration of nanocomposite MoS₂ can lead to a more hydrophilic active layer. With the concentration of MoS₂ continuously increases, relative intensity increases accordingly. However, after a certain concentration, the relative intensity remains the same or even decreases.
For membrane with 0.05%, 0.1% and 0.2% MoS₂, when the concentration of MoS₂ increases, relative intensity increases accordingly. However, as the amount of MoS₂ continuously increases to 0.5% and 1.5% the relative intensity doesn’t change a lot.
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2019-04-24
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