preparation of spherical regenerated cellulose white balls: add 4g of regenerated cellulose white balls into 15ml of 0.4mol/L Ce(SO4)2 solution and soak for 30min, then add 10ml of styrene, 1ml of Tween-80 and 50ml of 1% H2SO4 solution in sequence, place the container containing the above substances in a thermostat at 40 ℃ for stirring for 15h, and filter out the solution, fine white homopolymer and fragments, carefully rinse the resin with about 100ml of distilled water, soak the resin with 0.5mol/L H2SO4 for 30min, wash off the residual Ce4 + and Ce3 + in the resin until the solution is colorless, then rinse with distilled water for 3-4 times, and then press 0.5mol/L NaOH (30min)& rarr; Distilled water washing & rarr;0.5mol/L HC.