在较温和的溶剂热条件下制备了一系列Al3+掺杂的ZnS纳米晶光催化剂。利用N,物理吸附、扫描电镜(SEM)、X射线衍射(XRD)、紫外可见漫反射光谱(uV—visDRS)、红外光谱(FT-IR)和光致发光(PL)谱等技术对合成的样品进行了表征。考察了不同含量的Al3+掺杂对ZnS的结晶度、比表面积、表面羟基、光吸收性能及其对不同染料的光催化降解性能的影响。结果表明,在140℃下合成的球状ZnS纳米晶具有较好的结晶度;Al3+掺杂在增加催化剂的比表面积的同时丰富了催化剂的表面羟基;此外,掺杂的Al3+可以明显抑制光生电子(e-)和空穴(h+)的复合,提高光催化反应效率。当掺杂最佳含量的6moi%AI时,可使催化剂光催化降解染料酸性橙Ⅱ、亚甲基蓝和罗丹明B的降解率分别提高3.5、1.0和0.9倍。
Under mild condition, a series of Al3+ doped method with ethylene glycol as the reaction medium and ZnS nanocrystals were prepared by a solvothermal zinc acetate ( Zn( CH3CO0) 2 " 2H20), thiourea ((NH2)2CS) and aluminum nitrate nonahydrate ( A1 ( NO3 )3 ) as the precursors. The obtained ZnS nanocrystals were characterized by N2 physical adsorption, scanning electron microscopy (SEM), X-ray diffraction( XRD), UV-vis diffuse reflectance spectra( UV-vis DRS), fourier transform infrared (FT-IR) spectrophotometer and photoluminescence (PL) spectroscopy. The effects of A13+ doping with different content on the crystallinity, surface area, surface groups, light adsorption and photocatalytic performance in degradation of different dyes were investigated ~C, the prepared spherical A13~ doped ZnS nanoc increase in surface area and a photogenerated higher ~ The results show that at the mild temperature of 140 rystals show high crystallinity. Al3+ doping results in an level of surface hydroxyl groups. A lower recombination rate of hole-electron (e-/h + ) pairs was also observed over Al3+ doped ZnS. Doping optimum content of Al3+ (6% mol) brings about 3.5, 1.0 and 0.9 times increase in degradation rates of the dyes of acid orange II, methylene blue, and rhodamine B, respectively.