CAJ | 학술논문

通过两步水热法合成了一种新型的还原氧化石墨烯(RGO)修饰的Bi2WO6(Bi2WO6-RGO),结果表明其在可见光下的光催化性能得到了显著的提高.研究了RGO在Bi2WO6-RGO中的含量对其光催化性能的影响,从而确定出RGO相对于Bi2WO6的最佳掺杂质量比值为1%.通过扫描电镜(SEM)研究发现,RGO并没有改变Bi2WO6光催化剂的结构和形貌.Bi2WO6-RGO在可见光下的光催化性能得以提高可以归功于RGO.其可能的机理是石墨烯的存在有利于光生载流子(激子)的分离,从而导致产生更多的O·-2用于有机染料污染物(如罗丹明B(RhB))的降解.RhB分子在石墨烯上的有效吸附可能也是导致Bi2WO6-RGO光催化性能提高的另一原因.
통과량보수열법합성료일충신형적환원양화석묵희(RGO)수식적Bi2WO6(Bi2WO6-RGO),결과표명기재가견광하적광최화성능득도료현저적제고.연구료RGO재Bi2WO6-RGO중적함량대기광최화성능적영향,종이학정출RGO상대우Bi2WO6적최가참잡질량비치위1%.통과소묘전경(SEM)연구발현,RGO병몰유개변Bi2WO6광최화제적결구화형모.Bi2WO6-RGO재가견광하적광최화성능득이제고가이귀공우RGO.기가능적궤리시석묵희적존재유리우광생재류자(격자)적분리,종이도치산생경다적O·-2용우유궤염료오염물(여라단명B(RhB))적강해.RhB분자재석묵희상적유효흡부가능야시도치Bi2WO6-RGO광최화성능제고적령일원인.
A new and improved photocatalyst, reduced graphene oxide (RGO)-modified Bi2WO6 (Bi2WO6-RGO), was synthesized by a two-step hydrothermal process. The effect of RGO content on photoactivity was investigated and the optimum mass ratio of RGO to Bi2WO6 was determined to be 1 %. Based on scanning electron microscopic study, RGO does not change the structure and morphology of the Bi2WO6 photocatalyst. Therefore, the improvement in the photoactivity of the Bi2WO6-RGO composite is undoubtedly ascribed to RGO. The presence of graphene can facilitate the dissociation of photogenerated excitons, which leads to more O·-2 to degrade dye pollutants like rhodamine-B (RhB). Moreover, the efficient adsorption of RhB molecules on graphene is another reason for the improved photoactivity.