| As is well known,water pollution has become a focus issue of the today’s world,so the research on wastewater treatment methods and technologies has attacked much interest in recent years.Among them,the photocatalytic degradation method and adsorption method are commonly used in sewage treatment.Recently,from the point of market economy,agriculture and forestry by-products have gradually become an essential choice of functional template materials and adsorption materials.The ideal green environmental protection raw materials(wood pulp and cotton pulp cellulose)are non-toxic and inexpensive natural polymer materials,which is abundant,biodegradable and renewable.In this paper,two kinds of functional cellulose membrane matrix composites had been successfully prepared by using wood pulp and cotton pulp cellulose as raw materials through several different methods.The contents of this paper are as follows:(1)At first,ZnS nanoparticles(ZnS NPs)with good dispersion,high crystallization and uniform particle size were fabricated by hydrothermal method,which surface was modified with KH-550.Then ZnS/cellulose membrane composites were prepared by physical mixing method.The results showed that ZnS NPs had been successfully doped into the cellulose membrane.The doping of ZnS NPs didn’t affect the crystal phase of cellulose membrane,and resulting in improving its thermal stability.When the doping amount of ZnS NPs was 1.5wt%,the mechanical properties of composites was the best,and the tensile strength and elongation at break were 2.78 MPa and 64.0%,respectively.In addition,the photocatalytic degradation results showed that when the doping amount of ZnS NPs was 1.5wt%,the degradation efficiency of composites on MO was the best.After 150 min,the degradation rate reached about 61.3%.(2)The ZnS/cellulose membrane composites had been successfully prepared by using a simple,economical and environmental liquid impregnation method.The results found that the ZnS NPs uniformly distributed on the surface of the cellulose membranes,and the crystallinity and the amount of the ZnS particles loaded on the cellulose membrane could be regulated by changing the cycle indexes of the liquid impregnation.The photocatalytic degradation results showed that the cellulose supporter made it easily to separate and recycle the photocatalytic,and prevented ZnS particles of aggregating,which also improved the photocatalytic degradation activity of the ZnS/cellulose membrane composite.The optimal condition is 4 cycle indexes of impregnation,and the potential applications are anticipant.(3)The cotton/wood cellulose mixed membrane matrix activated carbon(AC)were prepared by using self-made cotton/wood cellulose mixed membrane as carbonaceous materials through K2CO3 chemical activation under 550~800 oC.The results showed the carbonization temperature and K2CO3 solution concentration was the same influence tendency on BET specific surface area and yield of AC.The obtained AC had the characterization of pore structure,micropore rich ranging of 2 nm similar to the honeycomb.The surface of AC contained abundant organic functional groups.The AC still retained some celluloseⅡcrystal structure with a part of graphite structure.The BET specific surface area and the adsorption capacity of harmful organic methylene blue(MB)on AC both revealed the best sample was AC-750-0.5 under 750 oC with the impregnation concentration was 0.5 mol/L.what’s more,at room temperature,the equilibrium,kinetics of MB on AC in line with the Langmuir isotherm model,second-order kinetics,and the maximum monolayer adsorption capacity up to 675.68 mg/g.In addition,desorption regeneration experiment showed that AC had stronger desorption regeneration capacity.After 3 regeneration,the desorption regeneration rate of AC was 64.74%. |
PDF Full Text Request