Fe@γ-Al_2O_3一维杂化纳米结构还原水中Cr(VI)研究  

Study On the Reduction of Cr(Vi) in Water by Fe@γ-Al_2O_3 One Dimensional Nanohybrids

作　　者：程抱奎 戚春江 方颂平 程抱昌[2] 

机构地区：[1]安徽瑞福祥食品有限公司,安徽亳州236800 [2]南昌大学材料科学与工程学院,江西南昌330031

出　　处：《水处理技术》2018年第1期17-20,共4页Technology of Water Treatment

基　　金：江西省青年科学家培养对象项目(20133BCB23002)

摘　　要：针对纳米零价铁(Fe0)易团聚和易被氧化等问题,采用均相共沉淀及后续热还原退火方法制备了20 nm左右的Fe0均匀分散于一维纳米结构的γ-Al_2O_3中,形成Fe@γ-Al_2O_3纳米杂化结构,研究了其对Cr(VI)金属离子的还原能力。结果表明,该杂化结构不仅能够明显提高纳米Fe0的稳定性,而且能大大改进对Cr(VI)的吸附还原降解能力,降解反应符合1级动力学过程。Fe与Al_2O_3摩尔比为2:5的样品去除效果最好,而且去除率随Fe@γ-Al_2O_3加投量的增加而增加,但是加投量达到2.5 g/L时去除速率达到饱和,反应1 h后可以去除95%以上的Cr(VI)。另外,p H为3时最有利于降解反应,去除速率最快。Aimed at the problems of easy agglomeration and oxidation of nanostructure zero-valent iron （Fe0）, one-dimensional Fe@γ-Al2O3 nanohybrids were synthesized by a homogeneous co-precipitation method followed by subsequent thermal reduction annealing, andits reduction capacity for Cr（VI） was studied. The results showed that, the nanohybrids could not only improve significantly the stability of Fe0 nanoparticles, but also greatly enhance the reduction ability of heavy metal Cr（VI） in water, the degradation reaction fit the first order kinetic process. When mole ratio of Fe to Al2O3 was 2：5, the removal efficiency was the best. And the removal rate increased with the increase of Fe@γ-Al2O3 dosage, however when the dosage reached 2.5 g/L, the removal rate was saturation, and above 95% Cr（VI） could be removed after 1 h reaction. In addition, when pH was 3, it was the most favorable for the degradation reaction of Cr（VI） and the removal rate was fastest.

关 键 词：零价铁 Γ-AL2O3 杂化纳米结构 吸附与还原 CR(VI)还原 

分 类 号：X703.1[环境科学与工程—环境工程]