电Fenton法解聚纤维素的研究-应用化学专业论文.docxVIP

电 电-Fenton 法降解纤维素的研究 河北工业大学硕士学位论文 河北工业大学硕士学位论文 THE RESEARCH OF THE DEPOLYMERIZATION OF CELLULOSE BY ELECTRO-FENTON REACTION ABSTRACT The cellulose depolymerization was carried out by the circulating Electro-Fenton reaction which was composed of graphite anode, activated carbon fiber(ACF) felt cathode with a large surface area and Na2SO4 and FeSO4 mixed solution associated with air blow. It was found that the amount of hydroxyl free radical (?OH) produced by circulating Electro-Fenton reaction have significantly affected the depolymerization. In this action we research the cathode materials, current strength, reaction time, pH, and other electric-Fenton factors.And the change of crystallinity was characterized by X-ray.Measuring the flow time of saturated cuene(CED) solution and cellulose-CED solution of the fixed concentration out of a capillary viscometer, calculating the polymerization degree according to Martin and Mark formula. The experimental results were showed that H2O2 could be effectively electrogenerated from O2 reduction on the ACF felt cathode.When the circulating Electro-Fenton reaction conditions were kept with the Na2SO4 concentration 10 g/L,current intensity 20 mA, the voltage 1000 mV, air sparging rate 2.5 L/min and the pH value of Na2SO4 solution about 3, the accumulation of hydrogen peroxide could be reached to 0.20 mmol. Lots of the reducing ends were produced after pretreatment. Many inter and infra hydrogen bonds were also disrupted. Having continuously reacted 24 hours at 25 ℃, the depolymerization ratio and the ii crystallinity decrease of the cellulose were got 53 % and 33.6 %, respectively. the Electro-Fenton methods using in degradating the cellulose has very good application prospect. KEY WORDS：Electro-Fenton, Hydroxyl free radical, Cellulose, Depolymerization iii 3 3 河北工业大学硕士学位论文 河北工业大学硕士学位论文 电 电-Fenton 法降解纤维素的研究 第一章 绪论 植物通过光合作用，生产地球上最丰富、最廉价的纤维素资源，全世界每年的植物体生成高达 1500 亿吨干物质，其中纤维素及半纤维素的总量为 850 亿吨[1]。用纤维素代替粮食和石油，生产人类所需 的轻工、化工产品意义重大。其过程的工业化