作　　者： ; ; ; ; ; ;

机构地区： 湖南大学环境科学与工程学院

出　　处： 《环境科学学报》 2009年第7期1426-1433,共8页

摘　　要： 采用Plackett-Burman(P-B)法和中心复合设计(Central Composite Design,简称CCD)对影响柚皮吸附Pb2+的6个条件进行筛选优化.P-B实验设计与统计学分析表明:pH值、Pb2+初始浓度、吸附剂用量是影响吸附率的3个关键因素.以吸附率为响应目标,对3因素进行中心复合设计,并经响应面法优化分析得到影响吸附率的二阶模型,确定了Pb2+吸附实验的最优操作条件:pH值5.4,Pb2+初始浓度为265.86mg.L-1,吸附剂用量为2.56g.L-1,实测吸附率达到92.47%,吸附量为96.01mg.g-1;整个吸附过程吸附剂柚皮没有经过任何化学预处理,效果优于一般的天然吸附剂.研究结果表明,柚皮是一种很具潜力的环保型廉价吸附剂. Plackett-Burman （P-B） design and Central Composite Design （CCD） were applied to optimize 6 factors for the biosorption of Pb^2＋ by citron peel. The P-B design and its following statistical analysis indicate that the pH, initial Pb（II） concentration, and adsorbent dosage were the 3 key factors significantly influencing Pb^2＋ removal. Considering biosorptiou as the response objective, a quadralic model was obtained by CCD for the 3 factors by analysis of response surface optimization. At the optimal biosorption conditions, i.e. pH 5.4, initial Pb^2＋ concentration 265.86 mg·L^-1 and adsorbent dosage 2.56 g·L^-1, the Pb^2＋ removal achieved 92.47% or 96.01 mg·g^-1. Citron peel does not need any chemical pre-treatment and the effect is better than most other natural biosorbents. In this study, the results show that citron peel biosorbent is a potential environmentally-friendly material which can be applied in wastewater treatment with low cost.

关 键 词： 柚皮 吸附率 设计 中心复合设计 响应面优化

领　　域： [环境科学与工程]