Enzyme Treatments Affect Surface Wettability Of Wheat Straw And Research On The Effect Mechanism

Utilizing crop straws producing the non-wood based panel is one of the popular projects in field of composite study around the world. Wheat is one of the most popular food plants that been cultivated in China. While providing food supply is also bring a large number of waste wheat straw yearly. Some old process on waste wheat straw such as burning can rise severe environmental problems. Thus, the exploitation of wheat straw has been becoming more and more concerned in China. In this experiment, I use lipase,xylanase,mixed enzyme,steam treatment and low temperature plasma treat wheat straw.Thus study the low of the surface wettability, chemical groups and bonding strength of wheat straw.The change law of surface contact angle and free energy of wheat straw show that surface wettability is improved after wheat straw was treated by enzyme. The contact angle of wheat straw is decreased. The surface free energy of wheat straw is increased. Steam treatment and low temperature plasma treatment also improved the surface wettability of wheat straw. The best condition of lipase for this treatment were reached at a pH value was 7.0,a temperature of 50℃,a time period of 7h; The best condition of xylanase for this treatment were reached at pH value was 5.0,a temperature of 50℃,a time period of 5h.I can see the surface of wheat straw was treated is rough by scanning electron microscope. By means of FT-IR, free radical and active functional group on wheat straw surface that treated by enzyme had increased in a great extent. These methods can improve the surface bonding strength of wheat straw.