ZnS微球的合成及光催化还原CO_2性能研究

Syntheses of ZnS microspheres for photocatalytically reducing CO_2

为了探究硫源对催化剂性能的影响,以硝酸锌为锌源,分别以硫代乙酰胺,硫脲,L-半胱氨酸为硫源采用水热合成法制备了不同形貌的ZnS微米球.利用XRD、SEM、UV-vis、PL表征手段探讨了ZnS形貌,光学等性能,SEM结果表明,硫代乙酰胺样品表面附着纳米级颗粒,硫脲样品表面非常光滑,而L-半胱氨酸样品微球由多层壳包裹而成.ZnS的光催化活性研究结果表明,制备ZnS催化剂所用硫源对其催化性能有显著影响.通过对ZnS荧光光谱分析探究了催化剂活性差异的原因.

In order to explore the effects of sulfur sources on the character of ZnS,a series of ZnS microspheres were synthesized by hydrothermal method,using zinc nitrate as zinc source and thioacetamide,thiourea,L-cysteine as sulfur sources respectively. XRD,SEM,UV-vis and PL were applied to characterize the morphology,optical and other physical properties of the as-prepared ZnS. It was found that different sulfur sources brought great differences on the morphology of ZnS microsphere surface. Photocatalytic reduction of CO2 in methanol forming methyl formate was used to evaluate the activity of ZnS. The results showed that sulfur source had significant influence on the photocatalytic activity. PL analysis demonstrated that the better photocatalytic performance of ZnS microspheres corresponded to the weaker intensity of fluorescence peaks.