摘要
为了提高污泥活性炭的吸附性能以提升其实际应用价值,提出在污泥中掺杂甘蔗渣制备复合活性炭,并采用Plackett-Burman联用响应面法对影响复合活性炭碘值的条件进行筛选优化。通过Plackett-Burman实验筛选出热解温度、热解时间和甘蔗渣与污泥干重比为主要影响因素,对这3个因素进行Box-Behnken实验,经响应面优化得到影响碘值的二次响应曲面模型,模型显示热解温度与热解时间、热解温度与干重比的交互作用显著,并确定了最佳制备条件:热解温度550℃、热解时间30 min和干重比50%,此时复合活性炭碘值为814 mg/g,优于未优化条件下制备的复合活性炭。通过比表面积、孔结构和碘值的测定以及元素和扫描电镜分析得出,甘蔗渣的掺杂提高了复合活性炭的比表面积、微孔体积、碘值及含碳量。研究结果表明,甘蔗渣掺杂和制备条件优化是提高污泥活性炭吸附性能的有效手段。
Sugarcane bagasse was added into sludge to prepare compositional activated carbons( CACs),and Plackett-Burman combining with response suraface methodology was employed to sieve and optimize the conditions affecting the iodine adsorption value of CACs. The Plackett-Burman results show that pyrolysis temperature,pyrolysis time and dried weight ratio of sugarcane bagasse to sludge are the main influencing factors. Using these three factors as variables,a second order model of the iodine adsorption value of CACs was obtained by Box-Behnken design and response surface methodology analysis. The model shows that the interactions of pyrolysis temperature and pyrolysis time,pyrolysis temperature and dried weight ratio are significant,and determines that the optimal pyrolysis temperature is 550℃,pyrolysis time is 30 min and dried weight ratio is 50%. The iodine adsorption value of CAC prepared under this condition is 814 mg / g,being higher than other CACs'. The effects of sugarcane bagasse addition on the physicochemical properties of CACs were investigated by analyzing surface area,pore structure,iodine adsorption value and carbon content,which indicate that the addition of sugarcane bagasse increases the surface area,micro-pore volume,iodine adsorption value and carbon content. The results indicate that addition of sugarcane bagasse and optimization of preparation conditions are effective methods to improve the adsorption properties of sludge based activated carbon.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第12期5475-5482,共8页
Chinese Journal of Environmental Engineering
