一步法制备溴化银/聚吡咯复合材料及其光降解性能探究

以十六烷基三甲基溴化铵(CTAB)作为溴源,硝酸银为银源,过硫酸铵氧化吡咯单体一步合成溴化银(AgBr)/聚吡咯(PPy)复合材料。使用傅里叶转换红外光谱、热重分析仪、X射线衍射仪和扫描电镜对AgBr/PPy复合材料的化学结构、质量比重、晶体结构及形貌特征进行分析。考查了AgBr/PPy复合材料在紫外光下降解罗丹明B的催化性能。结果表明:复合材料在电镜照片下呈现球状形貌,AgBr微球粒径为200～300 nm;XRD图谱衍射峰证明复合材料中存在PPy和AgBr;受二者化学键合的影响,复合材料红外光谱图相比PPy样品发生红移。TG测试表明,复合材料中AgBr含量为29%。在紫外光照射下,复合材料降解罗丹明B,60 min的效率可达86%,降解效果优于AgBr样品,相比物理混合样降解能力提升约10%。

Preparation and photodegradation of silver bromide/polypyrrole composites

A silver bromide (AgBr)/polypyrrole (PPy) composite was synthesized in one step by using cetyltrimethylammonium bromide (CTAB) as the bromine source,silver nitrate as the silver source and ammonium persulfate to oxidize the pyrrole monomer. The chemical structure,mass specific gravity,crystal structure and morphology of AgBr/PPy composite were analyzed by Fourier transform infrared spectroscopy,thermogravimetric analysis,X-ray diffractometry and scanning electron microscopy. The catalytic performance of AgBr/PPy composites for degradation of rhodamine B under ultraviolet light was investigated. The results showed that the composite had a spherical morphology under the electron micrograph. The particle size of AgBr microspheres was 200~300 nm. The XRD pattern diffraction peaks proved the presence of PPy and AgBr in the composite. Affected by the bonding between PPy and AgBr,red shift was observed in the infrared spectrum compared to that of the PPy sample. The TG test showed that the AgBr content in the composite was 29%. Under ultraviolet light,the efficiency of the degradation of rhodamne B by the AgBr/PPy composite was 86% for 60 min,which was better than that of the AgBr sample and also about 10% higher than that of physical mixed sample.