活性炭配炭的吸附性能及其与孔结构的关系

Adsorption properties of blending activated carbons and their relationship with pore structure

采制11种典型水处理用商品活性炭样品,两两混合进行配炭,对配炭组分及配炭的碘值、亚甲蓝值、丹宁酸值和焦糖脱色率等吸附性能指标及孔结构特征进行了测试和表征。采用加权平均拟合、线性拟合及多项式拟合等方法,研究配炭吸附性能指标与配炭组分吸附性能指标间的量化关系,关联活性炭孔结构与吸附性能指标。结果表明:活性炭配炭的吸附性能指标可由配炭组分的吸附性能指标通过加权平均计算,相对误差<4%,且配炭的孔结构也具备加和性;活性炭碘值、亚甲蓝值、丹宁酸值和焦糖脱色率的大小分别取决于活性炭1.0~2.8nm、1.5~10nm、2.0~50nm和3.0~50nm孔隙的发达程度,与孔容积的线性相关系数介于0.91~0.94。

Eleven typical commercial activated carbons for water treatment were sampled,and then a series of blending activated carbon samples were prepared by mixing them in pairs.The adsorption properties including iodine number,methylene blue adsorption value,tannic acid number and caramel adsorption value of these original and blending activated carbon samples were determined,and their pore structure characteristics were characterized.Besides,the quantitative relationship of adsorption property between blending activated carbons and original activated carbons was investigated by weighted average fitting method,linear fitting method and polynomial fitting method.Also,the dependence of adsorption property on porosity was analyzed and discussed.The results showed that the adsorption properties of blending activated carbons can be calculated by those of original activated carbon according to the weighted average method,the relative error is less than 4%.And the blending carbon porosity is also additive.The iodine number,methylene blue adsorption value,tannic acid number and caramel adsorption value are dependent on the pore volume of 1.0-2.8 nm,1.5-10 nm,2.0-50 nm and 3.0-50 nm,with linear correlation coefficients of 0.91-0.94,respectively.