张永祥1,
井琦1,
白冰1,
常杉1
1.北京工业大学建筑工程学院，北京 100124
基金项目: 国家重点研发计划（2016YFC0401404）
北京市科委项目（Z161100004516015）
Conditions optimization for 2, 4-dichlorophenol removal by CMS-coating nano zero-valent iron
GUO Wenjun1,,ZHANG Yongxiang1,
JING Qi1,
BAI Bing1,
CHANG Shan1
1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
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摘要:针对纳米零价铁（Fe0）去除2，4-二氯酚(2，4-DCP)时易团聚、易氧化、去除效率差等问题，采用环境友好材料羧甲基淀粉钠（CMS）对纳米零价铁进行了包覆，制成包覆型纳米零价铁。探究了包覆比例(CMS:Fe0)、pH、包覆型纳米零价铁投加量等单因素对去除率的影响。在单因素实验的基础上，以包覆比例、pH、包覆型纳米零价铁的投加量为考察因素，以2，4-DCP的去除率为响应值，采用二次多项式响应面探究多因素交互作用对包覆型纳米零价铁去除2，4-DCP的影响。利用响应面优化模型对包覆型纳米零价铁去除2，4-DCP进行优化。模型优化结果显示：包覆型纳米零价铁去除2，4-DCP的最佳条件为 pH 3.0，纳米零价铁包覆比例3.59:1，包覆型纳米零价铁的投加量7.96 g·L-1，模型预测2，4-DCP的最高去除率为 90.03%，实验值为 85.77%，两者相对误差为4.73%，证明了优化模型的可靠性。
关键词: 包覆型纳米零价铁/
2，4-二氯酚/
响应面法
Abstract:Aiming at the problems of easy agglomeration, easy oxidation and poor removal efficiency when 2,4-dichlorophenol was removed by nano zero-valent iron (nZVI) alone, a kind of environmentally friendly material of carboxymethyl starch sodium (CMS) was used to coat nZVI for a new CMS-coated Fe0 preparation. The effects of single factor variables such as coating ratio (CMS: Fe0), pH, and nZVI dosage on the removal rate were investigated. On the basis of single-factor experiments, the response surface methodology was used to study the impact of multi-factor interactions on 2,4-dichlorophenol removal by the CMS coated nZVI when the coating ratio, pH, and Fe0 dosage were taken as the investigation factors, and the removal rate of 2,4-dichlorophenol (2,4-DCP) was used as the response value, then a quadratic polynomial optimization model was established to optimize above removal process. The results showed that the optimal conditions are following: the pH was 3.0, the coating ratio for nZVI was 3.59:1, the CMS coated nZVI dosage was 7.96 g·L-1. The maximum removal rate of 2,4-DCP predicted by the model was 90.03%, and the corresponding experimental value was 85.77%. The relative error of 4.73% between them proved the reliability of the optimization model.
Key words:coated nano zero-valent iron/
2,4-dichlorophenol/
response surface methodology.
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CMS包覆纳米零价铁去除2，4-二氯酚的条件优化
郭汶俊1,,张永祥1,
井琦1,
白冰1,
常杉1
1.北京工业大学建筑工程学院，北京 100124
基金项目: 国家重点研发计划（2016YFC0401404） 北京市科委项目（Z161100004516015）
关键词: 包覆型纳米零价铁/
2，4-二氯酚/
响应面法
摘要:针对纳米零价铁（Fe0）去除2，4-二氯酚(2，4-DCP)时易团聚、易氧化、去除效率差等问题，采用环境友好材料羧甲基淀粉钠（CMS）对纳米零价铁进行了包覆，制成包覆型纳米零价铁。探究了包覆比例(CMS:Fe0)、pH、包覆型纳米零价铁投加量等单因素对去除率的影响。在单因素实验的基础上，以包覆比例、pH、包覆型纳米零价铁的投加量为考察因素，以2，4-DCP的去除率为响应值，采用二次多项式响应面探究多因素交互作用对包覆型纳米零价铁去除2，4-DCP的影响。利用响应面优化模型对包覆型纳米零价铁去除2，4-DCP进行优化。模型优化结果显示：包覆型纳米零价铁去除2，4-DCP的最佳条件为 pH 3.0，纳米零价铁包覆比例3.59:1，包覆型纳米零价铁的投加量7.96 g·L-1，模型预测2，4-DCP的最高去除率为 90.03%，实验值为 85.77%，两者相对误差为4.73%，证明了优化模型的可靠性。
English Abstract
Conditions optimization for 2, 4-dichlorophenol removal by CMS-coating nano zero-valent iron
GUO Wenjun1,,ZHANG Yongxiang1,
JING Qi1,
BAI Bing1,
CHANG Shan1
1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
Keywords: coated nano zero-valent iron/
2,4-dichlorophenol/
response surface methodology
Abstract:Aiming at the problems of easy agglomeration, easy oxidation and poor removal efficiency when 2,4-dichlorophenol was removed by nano zero-valent iron (nZVI) alone, a kind of environmentally friendly material of carboxymethyl starch sodium (CMS) was used to coat nZVI for a new CMS-coated Fe0 preparation. The effects of single factor variables such as coating ratio (CMS: Fe0), pH, and nZVI dosage on the removal rate were investigated. On the basis of single-factor experiments, the response surface methodology was used to study the impact of multi-factor interactions on 2,4-dichlorophenol removal by the CMS coated nZVI when the coating ratio, pH, and Fe0 dosage were taken as the investigation factors, and the removal rate of 2,4-dichlorophenol (2,4-DCP) was used as the response value, then a quadratic polynomial optimization model was established to optimize above removal process. The results showed that the optimal conditions are following: the pH was 3.0, the coating ratio for nZVI was 3.59:1, the CMS coated nZVI dosage was 7.96 g·L-1. The maximum removal rate of 2,4-DCP predicted by the model was 90.03%, and the corresponding experimental value was 85.77%. The relative error of 4.73% between them proved the reliability of the optimization model.
