纳米零价锌的结构演化及无光催化降解性能  

Structure evolvement of nanoscale zero-valent zinc particles for light-free catalytic degradation

作　　者：任光鹏 李生娟[1] 徐波[2] 索路路[1] 邹义成 REN Guangpeng;LI Shengjuan;XU Bo;SUO Lulu;ZOU Yicheng(College of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;College of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]上海理工大学能源与动力工程学院,上海200093

出　　处：《功能材料》2018年第7期7008-7013,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51402192)

摘　　要：金属材料经机械应力加载处理后反应活性明显提升,具有较强还原活性的纳米零价金属可有效降解染料废水中的有机污染物。采用辊压振动研磨法对原料锌粉进行机械活化处理,无任何添加剂情况下得到纳米零价锌粉颗粒。通过扫描电子显微镜观察可得,振动研磨机械力作用有效地改变了纳米零价锌的粒度大小,其颗粒尺寸随研磨时间的延长呈现周期性变化,平均粒度在40~90nm之间。通过X射线衍射分析和Lorentzian近似函数的最小二乘法计算分析得到,研磨后的纳米零价锌仍为密堆六方纤锌矿结构,但其微结构在应力场作用下发生改变,研磨15h纳米零价锌的层错几率达到2.03%。不同研磨时间的纳米零价锌具有不同的催化活性,对亚甲基蓝的无光催化降解呈现出不同的反应速率,研磨15h的试样具有最快的降解速率,无光催化反应30min后对亚甲基蓝的降解率达到72.72%。The reaction activity of metal materials was obviously aroused by the mechanical stress loading.The organic pollutants in dye wastewater could be effectively degraded by nanoscale zero-valent metal which had strong reducibility.In this paper,the raw zinc powders had been activated and nanoscale zero-valent zinc（NZVZ）particles were prepared by roller vibration milling with different time without any additives.The observation of the scanning electron microscope（SEM）indicated that the grain sizes of NZVZ ranged from 40-90 nm and presented periodical changing with loading time.The NZVZ particles were still close-packed hexagonal wurtzite structure.The analysis results of Lorentzian approximation function with least-squares calculation displayed that the stacking fault probability of NZVZ particles with 15 hmilling reached up to 2.03%.The lightfree degradation experiments to MB solution showed the NZVZ particles had the different reaction rate.15 h milling samples obtained 72.72% degradation after 30 min reaction.

关 键 词：振动研磨 机械活化 纳米零价锌 无光催化降解 

分 类 号：TQ09[化学工程] X703[环境科学与工程—环境工程]