改性粉煤灰对废水色度的吸附研究  

Study on the Adsorption of the Chroma in Wastewater by Modified Fly Ash

作　　者：阳卫国[1] 钟文毅[2] 蒋兴国[1] 郭宜忠[1] 

机构地区：[1]湖南衡阳钢管集团有限公司,湖南衡阳421001 [2]中南大学化学化工学院,长沙410083

出　　处：《工业安全与环保》2010年第5期7-8,32,共3页Industrial Safety and Environmental Protection

摘　　要：对粉煤灰进行水合碱改性和酸改性,合成改性粉煤灰。比较不同改性粉煤灰的氮BET比表面积和孔径大小;通过线性回归分析考察色度吸附容量与改性粉煤灰的比表面积、孔径的相关性;考察溶液pH值对色度的吸附性能的影响。实验结果表明,水合碱改性(熟石灰与粉煤灰质量比为1.5∶1)再硫酸(0.10 mol/L)改性粉煤灰对色度的吸附容量为lg[(c0-c)/c]=0.67;溶液pH值在3.5～6.5之间色度吸附效率最佳;回归分析出吸附剂的吸附容量和比表面积、孔径分布显著相关,比表面积越大,孔径越小,吸附性能越高。Fly ash properties are modified respectively by Ca（OH）2 and H2SO4 and their N - BET specific surface area and pore size distribution are tested. The linear regression method is applied to test the con＇elations of the specific surface area and pore size distribution of chroma adsuption capacity and modified fly ash and investigate the effects of pH on ehroma adsorption. The results show that fly ash treated by Ca （ OH）2（ 1.5/1 ） and H2SO4 （0.10 mol/L） can significantly improve the adsorption capacity of ehronm to lg[ （ co - c）/c] = 0.67. It can be investigated that favorable elimination of chroma by fly ash treated by Ca（OH）2 within the pH range of 3.5 - 6.5. The higher BET SSA, the lower the pore size distribution and the higher the adsorption of capacity.

关 键 词：粉煤灰 吸附 比表面积 孔径分布 色度 回归 

分 类 号：X703[环境科学与工程—环境工程]