基于响应面优化条件下柚皮对Pb^2＋的吸附  

Optimization of the biosorption of Pb^(2+) by citron peel using response surface methodology

作　　者：李璐[1] 杨朝晖[1] 孙珮石[2] 黄兢[1] 曾光明[1] 周长胜[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]云南大学环境与湖泊研究院,昆明650091

出　　处：《环境科学学报》2009年第7期1426-1433,共8页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金资助项目(No.50478053);长江学者和创新团队发展计划资助;湖南省自然科学基金重点项目(No.05JJ2004)~~

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 Plackett—Burman设计 中心复合设计 响应面优化 

分 类 号：X703[环境科学与工程—环境工程]