摘要
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N2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-vis DRS)、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6mol%Al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.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第12期2620-2626,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(21067004
21263005)
江西省自然科学基金青年科学基金计划(20133BAB21003)
江西省教育厅科学基金项目(GJJ12344)
江西省青年科学家培养计划(20122BCB23015)
关键词
ZnS纳米晶
AL掺杂
溶剂热
光催化
降解率
ZnS nanocrystal
A1 doping
solvothermal
photocatalysis
degradation rate
