高分散纳米钙锆复合材料催化臭氧氧化降解间甲酚废水

采用共沉淀法制备了一系列Ca-Zr复合材料,探究了不同的焙烧温度对材料结构和化学性质的影响。使用X射线衍射、扫描电子显微镜及高分辨透射电镜等分析手段表征了所制备样品的物相变化和颗粒形貌特征，以间甲酚为底物，采用臭氧催化氧化方法对所得催化剂的催化性能进行了分析。结果表明：当焙烧温度升高到1 000 ℃以上时，样品晶型以斜方晶系CaZrO₃为主，随着焙烧温度的升高，颗粒更加均匀分散。
在催化臭氧氧化降解间甲酚实验中，当焙烧温度为800 ℃时, TOC去除率最高可达到79%。800 ℃焙烧所得的样品由纳米颗粒组成，晶格间距为0.29 nm，说明样品的高暴露晶面为CaZrO₃的(121)晶面；XPS结果证实了样品的高活性可能是由晶格氧和表面羟基基团起重要作用而导致的。这种高效的纳米钙锆复合材料为催化臭氧氧化处理废水奠定了良好的基础。

Degradation of m-cresol wastewater by catalytic ozonation with highly dispersed nano-calcium-zirconium composites

A series of Ca-Zr composites were prepared by co-precipitation method. The effects of calcination temperatures on the structure and chemical properties of the materials were explored. X-ray diffraction, scanning electron microscopy and high resolution transmission electron microscopy were used to characterize the phase changes and particle morphology of the prepared samples. The performance of this catalyst was analyzed with catalytic ozonation of m-cresol. The results showed that when the calcination temperature was above 1 000 ℃, the crystal form of the catalyst sample was mainly orthorhombic CaZrO3, and the particles were more uniformly dispersed with the increase of calcination temperature.
In the experiments of m-cresol degradation by catalytic ozone oxidation, at the calcination temperature of 800 ℃, TOC removal rate could reach up to 79%. The sample calcined at 800 ℃ was composed of nanoparticles with a lattice spacing of 0.29 nm, indicating that the highly exposed crystal plane of the sample was the (121) plane of CaZrO3.The XPS results confirmed that the lattice oxygen and surface hydroxyl groups may play important role in the high activity of the sample. This high-efficiency nano Ca-Zr composite material lays a good foundation for catalytic ozone oxidation treatment of wastewater.