铁掺杂羟基锆柱撑钛酸盐的制备及光催化性能

Preparation and Photocatalytic Activity of Fe-Doped Hydroxyl-Zr Pillared Titanate

采用单分子层剥离-重堆积技术将掺铁的聚合羟基锆离子嵌入到钛酸盐层间,制得了铁掺杂羟基锆柱撑钛酸盐复合材料(FZPT),考察了Fe掺杂对Zr柱撑钛酸盐复合材料(ZPT)形成及光催化活性的影响.利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见漫反射光谱仪(UV-Vis DRS)和吸附分析仪等对材料进行了表征.结果表明,当铁的掺入量小于锆质量的10%时,复合柱撑材料FZPT的孔径和比表面积随着Fe掺入量的增加而增大,继续增加则结果相反.紫外-可见光催化降解亚甲基蓝(MB)实验结果表明,FZPT催化活性均高于ZPT,可能与掺杂后材料形成介孔结构与比表面积增大有关.样品FZPT-0.20的可见光催化活性相对较好,表明材料的光催化活性与掺杂后柱撑材料中含铁客体与主体间的电子耦合作用有关.

To fabricate Fe-doped-hydroxyl-Zr pillared titanate（ abbreviated as FZPT） with delaminated structure,the exfoliated layered titanate in aqueous solution was reassembled in the presence of hydroxyl-Zr oligocations and iron cation under the exfoliation-restacking route to induce a great number of mesopores and eventually a large surface area of photocatalysts. The influence of doping iron cations on the preparation and catalytic activity of the Zr-pillared composites（ ZPT） was investigated. The material was characterized by powder X-ray diffraction,UV-Vis DRS spectra,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM）,and specific surface area and porosity measurements. When n（ Fe） / n（ Zr） in FZPT was less than 10%,the diameter of mesopore and specific surface area increased with the amount of iron,and vice versa. The results of degradation of methylene blue（ MB） under ultraviolet and visible radiation showed that the FZPT nanocomposites exhibited higher photocatalytic activities than ZPT, which was based on the mesoporous structure and increased specific surface area. The FZPT-0. 20 nanocomposite exhibited an enhanced photocatalytic activity in the degradation of MB under visible-light irradiation,attributed to the electronic coupling between the host and the guest cations contained iron.