锰掺杂ZnS/石墨烯/纤维素复合材料的制备及光催化性能

Preparation and Photocatalytic Activity of Mn-Doped and Undoped ZnS/Graphene/Cellulose Composites

以硝酸锌(Zn(NO_3)_2·6H_2O)为锌源,以硫化钠(Na_2S·9H_2O)为硫源,通过一步水热法制备得到未掺杂和锰掺杂的石墨烯(GO)修饰的ZnS量子点,并同步将其负载于纤维素纤维上,得到具有优良光催化性能的纤维素纤维。探究了GO添加量、Mn^(2+)掺杂量对ZnS/GO/纤维素复合材料光催化性能的影响。通过扫描电镜(SEM)、激光共聚焦显微镜(CLSM)、荧光光谱(PL)、紫外-可见光分光光度计(UV-vis)对量子点纤维素材料进行分析表征。同时,采用甲基橙(MO)作为光催化底物,探究了纤维素复合材料的光催化性能及循环使用性能。结果表明,在光催化15 min内ZnS/GO/纤维素复合材料可将甲基橙光催化降解完全,而锰掺杂后的复合材料在光催化10 min内就已将甲基橙降解趋于完全;ZnS/GO/纤维素复合材料和Mn:ZnS/GO/纤维素复合材料具有优异的循环使用性能,样品经循环使用10次后,光催化30 min内甲基橙的光催化降解率仍可达到57%。

Undoped and manganese-doped graphene-modified ZnS quantum dots were prepared by one-step hydrothermal method using zinc nitrate(Zn(NO3)2·6 H2O) as the zinc source and sodium sulfide(Na2S·9 H2O) as the sulfur source, and the quantum dots were simultaneously loaded on cellulose fibers to obtain cellulosic fibers with excellent photocatalytic properties. The influences of GO addition amount and Mn2+ doping amount on photocatalytic properties of ZnS/GO/cellulose composites were investigated. The quantum dots cellulosic material was analyzed with scanning electron microscopy(SEM), laser convergence microscope(CLSM), fluorescence spectrometry(PL) and UV light spectrophotometer(uv-vis). Methyl orange(MO) was used as the photocatalytic substrate to investigate the photocatalytic and recycling properties of cellulose composites. After 15 min of photocatalysis, ZnS/GO/cellulosic composites were completely finish the photocatalytic degradation of methyl orange, while the composites of manganese doping tended to completely degrade methyl orange after 10 min of photocatalysis. In addition, ZnS/GO/cellulose composites and Mn: ZnS/GO/cellulose composites have excellent recycling performance. After 10 times of recycling, the photocatalytic degradation rate of methyl orange can still reach 57% after 30 min of photocatalysis.