利用铅锌废渣制备银修饰纳米复合材料的研究

Preparation of Silver Modified Composite Nanomaterials from Metallurgical Lead and Zinc Slag

摘要:

以含银的铅锌废渣为银源,联合采用氯盐法、St?ber法、溶胶凝胶法以及光沉积法能够制备出银的纳米复合材料Ag@TiO₂@SiO₂。XRD和TEM的分析表明：Ag@TiO₂@SiO₂具有核壳结构的纳米材料,Ag以10nm团簇的形式沉积在锐钛矿型TiO₂壳层上。XPS分析指出：TiO₂以Ti-O-Si键化学吸附在SiO₂上,而沉积在TiO₂上的银是银的单质。Uv-Vis的分析表明：材料Ag@TiO₂@SiO₂对光响应范围扩大到可见光区。罗丹明的光降解反应表明,Ag@TiO₂@SiO₂的光催化性能优良。

Abstract:

Metallurgical lead and zinc slag taken as resource of silver, silver modified nanomaterials Ag@SiO₂@TiO₂ were successfully synthesized by chlorine salt method, St?ber method, sol-gel method and photo-deposited method. X-ray diffraction (XRD)and transmission electron microscopy (TEM) prove that composite Ag@SiO₂@TiO₂with core-shell structure, which Ag was deposited on anatase TiO₂ in the form of cluster with 10 nm diameter. X-ray photoelectron spectroscope (XPS) indicates that in silver modified Ag@SiO₂@TiO₂, TiO₂ was chemisorbed on SiO₂ core in Ti-O-Si chemical bond and Ag deposited on TiO₂ shell was elementary substance of silver. UV-vis diffuse reflectance spectra (DRS) shows that silver modified Ag@SiO₂@TiO₂ widened TiO₂ response range towards light to expand to visible region. The photocatalytic degradation reaction of rhodamine indicates that silver modified nanocomposite Ag@SiO₂@TiO₂ possessed the excellt catalytic performance.