城市污泥添加软锰矿制备活性炭的研究

Study on Preparation of Activated Carbon from Pyrolusite-added Sewage Sludge

以城市污泥为原料,添加适量的软锰矿,采用氯化锌活化法制备活性炭。采用BET、SEM、FT-IR、O2-TPO、XRD、TGA等方法对其结构和性能进行了表征,并分析了软锰矿对活性炭制备过程的影响。研究结果表明,在实验条件下,城市污泥添加软锰矿制备的活性炭比表面积为354.198 m2/g,总孔体积为0.809 6 cm3/g,微孔体积为0.159 cm3/g,平均孔半径为4.6 nm,碘吸附值为558.05 mg/g。上述性能参数相较于纯污泥制备的活性碳都有较大程度的提高。在使用添加了软锰矿的城市污泥制备活性炭的过程中软锰矿催化了污泥中有机质的分解,同时也为新生炭提供了更多的骨架,促进了积炭反应,有助于形成孔隙发达的微晶结构。

Activated carbon was prepared from pyrolusite-added sewage sludge by ZnCl2 activation method.Its structure and performance were characterized by BET,SEM,FT-IR,XRD,O2-TPO and TGA,and the impact of pyrolusite to the preparation of activated carbon was analyzed.The result showed that the specific surface area,total pore volume,micro-pore volume,average pore radius and iodine adsorption of activated carbon from pyrolusite-added sewage sludge can reach 354.198 m2/g,0.809 6 cm3/g,0.159 cm3/g,4.6 nm and 558.05 mg/g,respectively,much more than that of activated carbon from sewage sludge.Pyrolusite catalyzed the decomposition of organic matters in the sewage sludge,which provided more framework for the new generated carbon,facilitated the carbon deposit and contributed to the formation of microcrystalline structure simultaneously in the preparation of activated carbon from pyrolusite-added sewage sludge.