Cr,Ag共掺杂ZnS纳米材料的制备及其对活性染料的吸附性能（英文）

Synthesis of Cr,Ag Co-Doped ZnS Nanomaterials and Its Adsorption Capability for Reactive Dyes

通过水热法制备了纤锌矿ZnS∶Cr,Ag共掺杂纳米材料,考察了不同反应时间以及不同Cr和Ag掺杂比例对ZnS纳米材料光学性能的影响。分别采用荧光分光光度计、红外光谱仪、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对Cr和Ag共掺杂ZnS纳米材料的光学性能和结构等进行了表征,探讨了ZnS∶Cr,Ag共掺杂纳米材料分别对甲基紫(MV)、丁基罗丹明B(BRB),四氯四溴荧光素(TCTBF)以及曙红B(EB)四种活性染料的吸附性能。结果表明,Cr3+和Ag+取代和嵌入到了Zn2+的位置,掺入到了ZnS的晶格中。由光学表征和扫描电镜(SEM)发现,掺杂后ZnS纳米材料的光学性能和形貌发生了改变。掺入Cr和Ag后,使得Zn纳米材料的荧光强度降低,且其形貌较规则,表面蓬松,呈绒球形状。当反应时间为12h,Cr和Ag掺杂比例分别为1%时,掺杂ZnS纳米材料的形貌和光学性能最佳。运用N2等温吸脱附分析技术计算了Cr和Ag共掺杂ZnS材料的比表面积和孔径分布,将其用于对MV,BRB,TCTBF以及EB四种活性染料的吸附研究,并分别从吸附时间、温度、pH值等因素考察了掺杂ZnS对几种活性染料吸附性能的影响,得出了Cr和Ag共掺杂ZnS材料在pH 7,室温下,分别经9,11,9和9h吸附时间后对四种活性染料的吸附效果达到最佳。

Cr,Ag co-doped wurtzite ZnS nanomaterials were prepared by hydrothermal method,and the effects about different reaction time and different doping ratio of Cr and Ag on optical property of ZnS nanomaterials were investigated.The optical performance and structure of Cr,Ag co-doped ZnS materials were characterized respectively by fluorescence spectrophotometer,infrared spectrometer,X-ray differaction（XRD）,and scanning electron microscope（SEM）,and the adsorption performance for four kinds of reactive dyes such as methyl violet（MV）,butylrhodamine B（BRB）,tetrachlorotetrabromo fluorescein（TCTBF）and eosin B（EB）was discussed further.The results showed that Cr3＋ and Ag＋ replaced and embeded into the location of Zn2＋,and doped into the crystal lattice of ZnS.Thus the optical property and morphology of doped ZnS nanomaterials changed according to the optical characterization and SEM.That is to say,after being doped into Cr and Ag,the fluorescence intensity of ZnS was reduced,moreover,it has normal shape,puffy surface and pompon-like structure.And the morphology and the optical property of doped ZnS nanomaterials were optimum as 12 h of the reaction time,and doping proportion of Cr and Ag were respectively 1%.According to the N2 isothermal adsorption-desorption analysis,the specific surface area and pore size distribution of Cr,Ag co-doped ZnS materials were calculated.Meanwhile,the doped ZnS materials were used to adsorb MV,BRB,TCTBF and EB respectively.And the influence of doped ZnS materials on adsorptivity for several reactive dyes were inspected from the factors such as adsorption time,temperature and pH value respectively.Then the maximum adsorption quantity of Cr,Ag co-doped ZnS materials for four reactive dyes was obtained under the conditions about 7 of pH value and 9,11,9 and 9 h of absorption separately at room temperature.