氧化钴掺杂的中空二氧化硅纳米管的制备及其催化性能研究

Synthesis of Co_(x)O_(y)-doped hollow silica nanotubes and their catalytic properties

以Co^(2+)配位的线性金属超分子聚电解质为模板,通过一锅法在水热条件下高收率地制备了Co_(x)O_(y)掺杂的中空二氧化硅纳米管(Co_(x)O_(y)-HSNs)。研究了Co_(x)O_(y)-HSNs在过氧化氢下降解一系列染料的效果,同时考察了合成条件与反应参数对降解效率的影响,并进行了初步机理研究。结果表明,主要活性氧化物种是单线态氧,且超氧自由基、碳酸根自由基和羟基自由基也参与了降解反应。

Co_(x)O_(y)-doped hollow silica nanotubes(Co_(x)O_(y)-HSNs) are prepared at a high yield by a one-pot method using Co^(2+)ions-containing linear metal supramolecular polyelectrolytes as templates.The degradation effect of a series of dyes by Co_(x)O_(y)-HSNs in hydrogen peroxide is studied.The effects of the synthetic conditions for Co_(x)O_(y)-HSNs and the reaction parameters for degradation of dyes on the degradation efficiency are investigated, and the degradation mechanism is preliminarily explored.It is indicated that singlet oxygen is the main active specie, and superoxide radicals, carbonate radicals, and hydroxyl radicals also participate in the degradation reaction.