Film preparation and performance of sodium alginate-chitosan-sodium bicarbonate membrane
Landfill waste often releases a significant amount of foul-smelling gases during excavation and transportation processes.These gases are characterized by high production,long duration,and wide-ranging impact.Among these foul-smelling gases,hydrogen sulfide(H2S)and ammonia(NH3)are some of the most typical.In this paper,an environmentally friendly spray film formula with barrier functionality was developed.By selecting appropriate ratios and using sodium alginate with a negative charge and chitosan with a positive charge,an alginate-chitosan polyelectrolyte was formed through cross-linking.Chemical deodorants,plasticizers,preservatives,and other ingredients were added to optimize the composite membrane,allowing it to maintain its physical transport effects while exhibiting excellent gas barrier properties.The results showed that a mass fraction of 2.0％of sodium alginate and chitosan membrane substrate,with a mixing ratio of 8∶2,and the addition of 1.0％sodium bicarbonate as a chemical deodorant,1.5％glycerol as a plasticizer,1.0％surfactant Tween 80,along with a mass fraction of 2.0％cinnamaldehyde as a fly repellent and insecticide,0.5％tea tree oil as a fragrance,and 1.0％sodium benzoate as a preservative to inhibit the transformation of sodium alginate during transport.The prepared sodium alginate-chitosan-sodium bicarbonate composite membrane could achieve a gas retention rate of over 95％for hydrogen sulfide(H2S)and ammonia(NH3)with a mass concentration of 70 mg·m-3 for 30 minutes.This meted the requirements of residual waste resource utilization engineering projects and effectively blocks foul-smelling gases during the mid-transfer of landfill waste.
万方数据
维普
