锰钾矿光催化降解苯酚及其影响因素研究

利用回流法合成隧道结构的锰钾矿,并研究其光化学降解苯酚的效果及影响因素。分别采用X射线衍射、原子吸收光谱、扫描电镜、透射电镜和BET氮气吸附法对锰钾矿的晶体结构(包括晶型、晶胞参数和结晶度)、化学组成、微观形貌和比表面积进行了表征。研究表明,非光照时锰钾矿对苯酚的降解效果较差,光照能显著促进锰钾矿对苯酚的降解;光照条件下,p H值减小能显著促进锰钾矿对苯酚的降解;锰钾矿用量增加至1.00 g/L时能显著促进锰钾矿降解苯酚,但继续增加矿物用量却显著降低苯酚降解率;非光照条件下,p H值减小和矿物用量增加不能显著促进锰钾矿降解苯酚。

A study of factors influencing photocatalytic degradation of phenol by cryptomelane

In this study, tunnel-structured cryptomelane was synthesized by a reflux method, and its crystal structure, crystal cell parameters, particle morphology and specific surface area were characterized. The degradation activity of cryptomelane on phenol with or without light was evaluated. In addition, the effect of pH and mineral loads on degradation of phenol were also investigated. The results indicated that a small amount of phenol was degraded by cryptomelane without irradiation, but a large amount of phenol was degraded under irradiation. The decrease of pH, the proper mineral loads and the concentration of phenol can all promote the degradation of phenol.