污染控制技术及原理
李璐,杨朝晖,孙珮石,黄兢,曾光明,周长胜.基于响应面优化条件下柚皮对Pb2+的吸附[J].环境科学学报,2009,29(7):1426-1433
基于响应面优化条件下柚皮对Pb2+的吸附
- Optimization of the biosorption of Pb2+ by citron peel using response surface methodology
- 基金项目: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)
- 李璐
- 湖南大学环境科学与工程学院, 长沙 410082
- 杨朝晖
- 湖南大学环境科学与工程学院, 长沙 410082
- 孙珮石
- 云南大学环境与湖泊研究院, 昆明 650091
- 黄兢
- 湖南大学环境科学与工程学院, 长沙 410082
- 曾光明
- 湖南大学环境科学与工程学院, 长沙 410082
- 周长胜
- 湖南大学环境科学与工程学院, 长沙 410082
- 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.
- Abstract:Plackett-Burman(P-B) design and Central Composite Design(CCD) were applied to optimize 6 factors for the biosorption of Pb2+ 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 Pb2+ removal.Considering biosorption as the response objective,a quadratic 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 Pb2+ concentration 265.86 mg·L-1 and adsorbent dosage 2.56 g·L-1,the Pb2+ 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.
摘要点击次数: 2864 全文下载次数: 3046