纳米红磷的制备及其光降解性能的研究

采用水热-研磨的方法处理商业红磷(C-RP)获得纳米级RP光催化剂。选择罗丹明B(RhB)考察该催化剂的光催化活性。研究结果表明C-RP经水热后选择研磨处理,其光催化活性显著提高。当研磨2h时,光催化剂体现出最高的光催化活性,其光降解速率常数是3.16×10^-2 min^-1,是C-RP的8.25倍。系列表征结果表明C-RP水热-研磨处理后提高其光催化活性的主要原因是:粒径变小,具有更多的活性位点,提高光生电子和空穴的迁移和分离。另外,通过捕获剂实验,最终确定在光降解反应过程中起主要作用的是光生空穴(h^+)和超氧基自由基(O2^·-)。

Preparation of Nano-size Red Phosphorus and Its Photodegradation Performance

In this paper,hydrothermal-grinding method was used to treat commercial red phosphorus(C-RP)to obtain nano-size RP photocatalyst.Rhodamine B(RhB)was selected to investigate the photocatalytic activity of the catalyst.The results showed that the photocatalytic activity of C-RP was significantly improved after hydrothermal-grinding.After grinding for 2 h,the photocatalyst exhibited the highest photocatalytic activity,and its photodegradation rate constant was 3.16×10^-2 min^-1,which was 8.25 times that of C-RP.Series of characterization results showed that the main reason for improving the photocatalytic activity of C-RP by hydrothermal-grinding treatment was that the particle size became smaller,had more active sites,and enhanced the migration and separation of photogenerated electrons and holes.In addition,through the trapping experiments,it was finally determined that the main effects of the photodegradation reaction were photogenerated holes(h^+)and superoxy radicals(O2^·-).