响应面分析法优化纳米零价铁铜双金属修复土壤浸提液中Cr(Ⅵ)

Optimization of remediation of Cr( Ⅵ) contaminated soil leachate by nano-zero valent iron/copper by response surface methodological analysis

采用液相还原法制备出纳米零价铁铜双金属,研究纳米零价铁铜双金属对土壤浸提液中Cr(Ⅵ)的修复作用。利用响应面分析方法,以处理时间、土壤浸提液的pH值和温度3个影响因素,纳米零价铁铜双金属对土壤浸提液中的Cr(Ⅵ)的去除率为响应值进行了3因素3水平的实验设计,得到响应曲面模型。对得到的响应曲面和方差进行分析。结果表明,模型的方差分析得到的F值和R2分别为15.18和0.951 3,处理时间、土壤浸提液的pH值和温度对土壤浸提液中Cr(Ⅵ)去除率的影响是显著的,模型在整个回归区域内拟合程度好,其影响顺序为处理时间>土壤浸提液的pH值>反应温度。

In this study,nano zero-valent iron / copper bimetallic particles were synthesized and used to remediate Cr（ Ⅵ）-contaminated soil leachate. Response surface methodological analysis was conducted using three factors（ time,pH,and temperature） and three levels with the Cr（ Ⅵ） removal rate of the nano zero-valent iron /copper bimetallic particles as the response value. The results of the analysis of variance of the model revealed that the F value and R2 were 15. 18 and 0. 951 3,respectively. These findings show that the three factors strongly influenced the Cr（ Ⅵ） removal rate. The analysis of variance also showed that the model can accurately simulate the treatment of Cr（ Ⅵ）-contaminated soil leachate. In terms of the strengths of their effects on the removal rate,the factors were ranked time soil leachate pH temperature.