摘要
为了探究Fe_2O_3在加热条件下对土壤中PCB30的催化降解效果,在单因素试验前提下,选取催化剂投加量、反应温度及反应时间等3个主要影响因素,采用中心响应面分析法构建三因素三水平回归模型。模型分析结果表明,Fe_2O_3催化降解PCB30的最优条件为催化剂投加量0.23 g,反应温度333.33℃,反应时间38 min,在此条件下的理论降解率为99.9%。根据该最优条件进行验证实验,实际降解率可达99.7%,说明实验所得模型对Fe_2O_3催化降解PCB30实际效果的预测准确可靠。在催化降解PCBs过程中,Fe_2O_3特有三价铁离子空穴形成的缺位结构引起邻近晶格氧能量升高,从而促使电子传递而易发生氧化还原反应。
In order to condition, three main the catalytic degradation efficiency of Fe2O3 for PCB30 in soil under heating impaet factors, including the amount of catalyst, reaction temperature and reaction time, were investigated to construct a regression model with three factors and three levels using core response surface method. Results demonstrated that, the optimal condition for PCB30 degradation was： Fe2O3 catalyst of 0.23 g, reaction temperature of 333.33℃, and reaction time of 38 min. Under this condition, the theoretical degradation rate reached 99. 9% , while the practical degradation efficiency could be as high as 99. 7%. The prediction model achieved from the present study was accurate and reliable. The analysis of catalytic d that lacunarystructure derived from ferric ion holes in Fe2O3 egradation mechanism of Fe2O3 showed could cause an increase in the energy of adjacent lattice oxygen atoms, which further led to electron transfer and redox reactions during the degradation process of PCBs.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2017年第5期1943-1950,共8页
Journal of Guangxi University（Natural Science Edition）
基金
广西自然科学基金资助项目(2010GXNSFA013004)
