Large-flux positively charged polyamide hybrid forward osmosis membrane and preparation method thereof

The invention discloses a large-flux positively charged polyamide hybrid forward osmosis membrane and a preparation method thereof. The preparation method includes the steps: providing a mixed reaction system at least including a polymer, a positively charged monomer, a solvent and an initiator, heating the mixed reaction system to obtain a film preparing liquid, applying the film preparing liquidto the surface of a matrix to form a liquid film, then making contact with water vapor and a cross-linking bath respectively to obtain the positively charged polymer base film with a cross-linking interpenetrating network structure; dispersing the mesoporous nano-silica modified by the positively charged polymer in an aqueous solution of amine monomers, to obtain a hybrid aqueous solution; makingthe positively charged polymer base film having the cross-linking interpenetrating network structure contact with the hybrid aqueous solution, then making contact with an acyl chloride oil phase solution, and carrying out int