采用浸渍法制备负载双金属(铁和铈)活性炭(Fe-Ce/AC),以Fe-Ce/AC为非均相Fenton催化剂处理兰炭废水。在单因素实验基础下,以pH值及H_2O_2和Fe-Ce/AC投加量为考察因素,兰炭废水COD去除率为评价指标,确定H_2O_2最佳投加量为3 m L,Fe-Ce/A...采用浸渍法制备负载双金属(铁和铈)活性炭(Fe-Ce/AC),以Fe-Ce/AC为非均相Fenton催化剂处理兰炭废水。在单因素实验基础下,以pH值及H_2O_2和Fe-Ce/AC投加量为考察因素,兰炭废水COD去除率为评价指标,确定H_2O_2最佳投加量为3 m L,Fe-Ce/AC最佳投加量为0.10 g,pH最佳值为4。采用中心组合设计-响应曲面法优化Fe-Ce/AC非均相Fenton技术处理兰炭废水工艺,结果表明,各影响因子显著性顺序为:pH>Fe-Ce/AC投加量>H_2O_2投加量,其中,H_2O_2投加量与Fe-Ce/AC投加量间交互作用显著,模型校正决定系数R2adj=为0.920 9,模型回归项极显著(P<0.000 1),表明模型可信度和准确度高;最佳工艺条件为:pH=3.7,H_2O_2投加量为2.7 m L,Fe-Ce/AC投加量为0.1 g,COD去除率模型预测值为81.31%,与实验值80.05%相比,相对误差为1.55%,表明模型对实验结果有良好的预测性。展开更多
The methylene blue（MB）removal abilities of raw activated carbon and iron/cerium modified raw activated carbon（Fe–Ce-AC）by adsorption were researched and compared.The characteristics of Fe–Ce-AC were examined by ...The methylene blue（MB）removal abilities of raw activated carbon and iron/cerium modified raw activated carbon（Fe–Ce-AC）by adsorption were researched and compared.The characteristics of Fe–Ce-AC were examined by N2adsorption,zeta potential measurement,FTIR,Raman,XRD,XPS,SEM and EDS.After modification,the following phenomena occurred：The BET surface area,average pore diameter and total pore volume decreased;the degree of graphitization also decreased.Moreover,the presence of Fe3O4led to Fe–Ce-AC having magnetic properties,which makes it easy to separate from dye wastewater in an external magnetic field and subsequently recycle.In addition,the equilibrium isotherms and kinetics of MB adsorption on raw activated carbon and Fe–Ce-AC were systematically examined.The equilibrium adsorption data indicated that the adsorption behavior followed the Langmuir isotherm,and the pseudo-second-order model matched the kinetic data well.Compared with raw activated carbon,the maximum monolayer adsorption capacity of Fe–Ce-AC increased by27.31%.According to the experimental results,Fe–Ce-AC can be used as an effective adsorbent for the removal of MB from dye wastewater.展开更多
文摘采用浸渍法制备负载双金属(铁和铈)活性炭(Fe-Ce/AC),以Fe-Ce/AC为非均相Fenton催化剂处理兰炭废水。在单因素实验基础下,以pH值及H_2O_2和Fe-Ce/AC投加量为考察因素,兰炭废水COD去除率为评价指标,确定H_2O_2最佳投加量为3 m L,Fe-Ce/AC最佳投加量为0.10 g,pH最佳值为4。采用中心组合设计-响应曲面法优化Fe-Ce/AC非均相Fenton技术处理兰炭废水工艺,结果表明,各影响因子显著性顺序为:pH>Fe-Ce/AC投加量>H_2O_2投加量,其中,H_2O_2投加量与Fe-Ce/AC投加量间交互作用显著,模型校正决定系数R2adj=为0.920 9,模型回归项极显著(P<0.000 1),表明模型可信度和准确度高;最佳工艺条件为:pH=3.7,H_2O_2投加量为2.7 m L,Fe-Ce/AC投加量为0.1 g,COD去除率模型预测值为81.31%,与实验值80.05%相比,相对误差为1.55%,表明模型对实验结果有良好的预测性。
基金the Specialized Research Fund for the National Natural Science Foundation of China (Nos.21567013, 51504119)the National High Technology Research and Development Program (863) of China (No. 2015AA020201)+1 种基金the Yunnan Applied Basic Research Project (No.2015FB129)the Yunnan Provincial Science and Technology Innovation Talents Scheme Technological Leading Talent (No.2013HA002)
文摘The methylene blue（MB）removal abilities of raw activated carbon and iron/cerium modified raw activated carbon（Fe–Ce-AC）by adsorption were researched and compared.The characteristics of Fe–Ce-AC were examined by N2adsorption,zeta potential measurement,FTIR,Raman,XRD,XPS,SEM and EDS.After modification,the following phenomena occurred：The BET surface area,average pore diameter and total pore volume decreased;the degree of graphitization also decreased.Moreover,the presence of Fe3O4led to Fe–Ce-AC having magnetic properties,which makes it easy to separate from dye wastewater in an external magnetic field and subsequently recycle.In addition,the equilibrium isotherms and kinetics of MB adsorption on raw activated carbon and Fe–Ce-AC were systematically examined.The equilibrium adsorption data indicated that the adsorption behavior followed the Langmuir isotherm,and the pseudo-second-order model matched the kinetic data well.Compared with raw activated carbon,the maximum monolayer adsorption capacity of Fe–Ce-AC increased by27.31%.According to the experimental results,Fe–Ce-AC can be used as an effective adsorbent for the removal of MB from dye wastewater.
