微波辅助制备甜菜渣活性炭

为了使甜菜渣得到更加充分有效的利用,本文探究了以甜菜渣为原料、氯化锌为活化剂、微波辅助制备甜菜渣活性炭的可行性。本文研究了甜菜渣和氯化锌溶液的比例(料液比)、氯化锌浓度、微波功率和辐照时间对活性炭吸附性能和产率的影响,并用氮气等温吸附、红外光谱和扫描电镜分析了最优制备条件下活性炭的比表面积、表面官能团和微观孔结构,得出其制备的最佳工艺条件为:料液比1∶6,氯化锌浓度30%,微波功率700 W和微波时间10 min。相应的活性炭的碘吸附量为1127.57 mg/g,亚甲基蓝吸附量为217.7 mg/g,产率为25.9%,BET比表面积为927.36 m2/g,总孔容为0.39 cm3/g,且表面具有含氧官能团和较好的孔结构。实验结果证实,以甜菜渣为原料、氯化锌为活化剂的微波辅助制备甜菜渣活性炭是可行的,为开发甜菜渣的高附加值产品提供了理论依据。

Preparation of Activated Carbon from Sugar Beet Pulp via Microwave-assisted Method

In order to utilize sugar beet pulp（SBP） sufficiently and effectively,the feasibility that zinc chloride as activator and SBP as raw material were selected to prepare activated carbon from sugar beet pulp（SBPAC） and the microwave-assisted method was explored in present study.Effects of SBP/ZnCl2ratio（solid-liquid ratio）,ZnCl2 concentration,microwave level and irradiation time on adsorption properties and yield of SBPAC were investigated.Meanwhile,the SBPAC under optimal preparation condition of solid-liquid ratio of 1∶6,30% ZnCl2 concentration,700 W of microwave level and 10 min of irradiation time was characterized by nitrogen adsorptiondesorption isotherms,fourier transform infrared spectroscopy and scanning electron microscopy.The corresponding adsorbance of iodine,adsorbance of methylene blue,yield,BET surface area and total pore volume were 1127.57 mg/g,217.7 mg/g, 25.9%,927.36 cm^2/g and0.39 cm^3/g,respectively,and the oxygen-containing functional groups on the surface and better pore structure were observed.The SBP as raw material and zinc chloride as an activator via microwave-assisted method to prepare SBPAC was confirmed in present study.It provides a theoretical basis to the development of high value-added products for SBP.