空心锌铬铁氧体/二氧化钛复合物的制备及去污性能

Preparation and Decontamination Capability of Hollow Zn-Cr Ferrite/Titanium Dioxide Composites

以葡萄糖溶液为原料,通过水热法制备了分散性良好的碳微球;以碳微球为模板,应用化学沉淀法和热处理技术除去碳核获得空心铬锌铁氧体;用钛酸四丁酯作为钛源,在空心铁氧体表面包覆二氧化钛制备了锌铬铁氧体/二氧化钛二元复合物.采用现代分析技术表征了制备样品的微观结构、形貌和电磁性能,并对其吸附和降解染料废水的性能进行了研究.结果表明,Zn Cr_(0.25)Fe_(1.75)O_4对染料废水具有较好的去污效果,对甲基橙和罗丹明B的去污效率分别为87%和83%;TiO_2对铁氧体的包覆能提高复合物对染料废水的光催化降解性能,其中m_(T/ZCF)=0.3的ZnCr_(0.25)Fe_(1.75)O_4/TiO_2复合物的去污效果最佳,几乎与纯二氧化钛相仿.

Homogeneous and dispersive carbon nanosphere was synthesized by hydrothermal method using glucose as the material. Hollow Cr-Zn ferrite was prepared by coprecipitation method and thermal treatment technology using carbon sphere as template. Ferrite / titanium dioxide composites were obtained by coating titanium dioxide on the ferrite using tetrabutyltitanate as titanic source. The structure,morphology,electromagnetic performance of as-prepared samples and their absorptivity and degradability on dye wastewater were studied by modern analytical techniques. The results showed that the hollow ZnCr0. 25Fe1. 75O）4 has preferable photocatalytic property on dye wastewater,and its removal efficiency on methyl orange and Rhodamine B are about 87% and 83%,respectively. The coating of TiO2 on the ferrite could improve photocatalytic activity of as-prepared sample,the ZnCr0. 25Fe1. 75O4/ TiO2 composite with 23. 08% of TiO2 content has excellent photocatalytic activity,and is equivalent to pure TiO2.