The invention discloses a preparation method of a
molybdenum disulfide nano dot
hybrid nano-
filtration membrane. The preparation method comprises the following steps: obtaining a hydrolyzed
polyacrylonitrile ultra-
filtration membrane from a
polyacrylonitrile ultra-
filtration membrane; dispersing amino-containing MoS2 nano dots in a
piperazine aqueous solution to prepare a water phase, and dissolving trimesoyl
chloride in normal
hexane to prepare an organic phase; and soaking the hydrolyzed
polyacrylonitrile ultra-
filtration membrane in a water phase, taking out the hydrolyzed polyacrylonitrile ultra-
filtration membrane, removing water drops on the surface of the membrane by using dust-free absorbent paper, then soaking the hydrolyzed polyacrylonitrile ultra-
filtration membrane in an organic phase, taking out the hydrolyzed polyacrylonitrile ultra-filtration membrane, washing the hydrolyzed polyacrylonitrile ultra-filtration membrane by using normal
hexane, and finally carrying out thermo-curing and filter pressing to obtain the MoS2 nano dot
hybrid nano-filtration membrane. The preparation method is simple and convenient to operate and convenient to implement, the separation layer forms a rapid water
transmission channel due to hybridization of the MoS2 nano dots, the separation layer has good water flux, meanwhile, the
rejection rate of
divalent salt is kept, and the
rejection rate of mono-valent salt is reduced. The
hybrid nano-filtration membrane prepared by the invention is applied to salt-containing
wastewater resourceful treatment, and has relatively high water flux and salt resourceful utilization efficiency.