Preparation, Characterization And Application Of Carbon-based Catalysts From Ramie Stalk For PET Degradation

Ramee is perennial of Raton character, a important textile fibers crops in our country, The Ramee is divided into three compartments, ramie leaf, radix boehmeriae, ramie stalk. Ramie from 70%to 80% of the weight of Ramee, This material includes cellulose, hemicelluloses, pectin, and lignin. As Biomass Waste Utilization, the ramie stalk is not used effectively right now, it both pollute the environment, and waste the resources. It pay more attention on how to make use of ramie stalk, changing waste into valuable, make its economic value right now. Polyethylene glycol terephthalate (terylene, PET) is a important textile raw material, it can be changed into BHET to recycle by glycol disaggregation of PET method. The ash content in ramie stalk is very low. But carbon content in ramie stalk is very high. The project is preparating active carbon with comparatively large hole by using ramie stalk as the main material, Further acidity loading or lalkalescence loading to preparate biomass green catalyst, to applicate in adsorption biodegradation of PET.First, this experiment tore the ramie stalk into tiny pieces, skive it to fine particles, then wash them clean and dry them. Use the ramie stalk as raw materials, igloss these ramie stalk between 300℃and 500℃to prepare carbonize carbonization’s particulate matter of ramie stalk. Then carry on loading H2SO4 acid on ramie stalk, wash them clean and dry them. This is how carbon back sulfoacid catalyst of Ramie stalk to preparate. Then the catalyst is characterized by IR, TG, XRD techniques. The result turns out:carbon back sulfoacid catalyst of Ramie stalk is form of inorganic carbon.-SO3 connects to carbocycle. The max sulfoacid number is 1.3561 mmol/g. The catalyst we got use to degradate PET bottle. The PET is in glycol,196℃,1% catalyst, react 3-5h. The result turns out:carbon back sulfoacid catalyst of Ramie stalk, has no effect on degradate PET, degradation rate of PET is very low. The degrade PET is recycled by reduced pressure distillation. After IR and Melting Point Test, degradation product is ethylene glycol terephthalate(BHET)The Ramie stalk is preliminary carbonized, loading KF、Na2SiO3 with appropriate amount and the loading temperature is from 150℃to 500℃,to prepare Supported zirconia carbon back catalyst of Ramie stalk. The IR and XRD analysis shows that the catalyst is amorphous, KF、Na2SiO3 didn’t produce chemical bonding. The incoming laden substance may be adsorbed in pore of active carbon. The catalyst has application in degradation of PET. The result turns out:no matter what KF or Na2SiO3 is loaded, the effectiveness on degradation of PET is very notable. Coefficient of recovery of BHET can achieve 50%, meanwhile the catalyst loaded by Na2SiO3 depredated more PET than the catalyst loaded by KF. The coefficient of recovery of BHET is very nearly the same between the two catalysts.