Modified synthetic niobia as catalyst in the oxidation of organic dye: utilization of H2O2 and atmospheric O2 as oxidants

Química Nova

Magriotis, Zuy M.¹  Silva, Adilson C.¹  Universidade Federal de Lavras, Lavras, Brasil¹  Carvalho, Kele T. G.¹  Gonçalves, Maraisa¹  Oliveira, Luiz C. A.¹ 

关键词: niobia;    ESI-MS;    oxidation process.;   

DOI  :  10.1590/S0100-40422009000600002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this work synthetic niobia was used to promote the oxidation of methylene blue dye in aqueous medium. The niobia was characterized by N2 adsorption/desorption, XRD and TG measurements. The presence of reactive species on the niobia surface strongly increased the oxidation rate of the methylene blue dye. The reaction mechanism was studied by ESI-MS suggesting that the oxidation of the organic dye involve oxidizing species generated mainly after previous treatment with H2O2. It can be observed that the catalyst is a good material in the activation of gas (atmospheric oxygen) or liquid (hydrogen peroxide) oxidant agent with a total discoloration of the dye solution after only 1 h of reaction.

【 授权许可】

Unknown