响应面法优化CoFe_2O_4高温改性海泡石制备条件研究

Optimizing Preparation of CoFe_2O_4/heat Activated Sepiolite with Response Surface Methodology

采用高温对天然海泡石原矿进行改性,制备具有可高温催化氧化再生CoFe2O4/高温改性海泡石吸附剂。利用SAS软件中的二水平设计和响应面分析法对制备CoFe2O4/高温改性海泡石的影响因素进行了优化。采用Plackett-Burman(PB)设计对影响CoFe2O4/高温改性海泡石再生率相关因素的效应进行了评价并筛选出显著因素:n(Co(NO3)3)∶n(Fe(NO3)3)、m(金属氧化物)∶m(海泡石)及煅烧温度,其它因素对CoFe2O4/高温改性海泡石再生率的影响不显著。根据Box-Behnken设计及响应面分析确定了重要影响因素的最佳条件。结果表明,CoFe2O4/高温改性海泡石的最适制备工艺为:n(Co(NO3)3)∶n(Fe(NO3)3)=1∶2.0,m(金属氧化物)∶m(海泡石)=0.50∶10,煅烧温度610℃。在该条件下CoFe2O4/高温改性海泡石的再生率达79.93%,与模型预测值十分吻合。

High-temperature catalytic oxidative and regenerate of crystal violet（CV） by CoFe2O4/heat activated sepiolite adsorbent is studied using heat activated sepio/ite as carrier,which is modified by high-temperature roasti-ng. The CoFe2O4 /heat activated sepiolite production is optimized using the Plackett-Burman design in SAS software and response surface analysis method. Firstly, a Plackett-Burman design is used to evaluate the influence of related factors. The results show that n（Co（NO3 ）3 ） ：n（Fe（NO3）3 ）, the mass of CoFe2O4/sepiolite ratio and calcination temperature are the main affecting factors while the other additives has no significant effect on the CoFe2O4/heat activated sepiolite production. Then the Box-Behnken design and response surface analysis are used to determine the optimal levels of the main factors. Under the optimal conditions, n（Co（NO3）3 ） ： n（Fe（NO3 ）3 ） is 1 ： 2. 0, the mass of CoFe2O4/sepiolite ratio is 0. 5 ： 10 and calcination temperature is 610℃, the regeneration rate of CoFe2O4/heat activated sepiolite is 79. 93%.