Kinetic and Mechanistic Study of Photodegradation of 4,4′-dibromobiphenyl by TiO2 films
The TiO2 film photodegradation of 4, 4′-dibromobiphenyl（4, 4′-DBB）have been investigated employing a UV lamp（8W），hydrogen peroxide (H2O2) and initial 4, 4′-DBB concentrations, initial pH, and possible reaction intermediates were also determined. The mechanism of photocatalytic degradation of 4, 4′-DBB by fixed TiO2 thin film was discussed. The dynamics of photocatalytic degradation of 4, 4′-DBB was also studied. The results indicate that the 4,4′-DBB degradation rate decreased with the increase of initial 4,4′-DBB concentration under the same conditions. An initial 4, 4′-DBB concentration of 0.5g/L was 90％ degraded within 4 hours. In contrast to the results of the studies on other organic compounds, the optimum pH for degradation of 4, 4′-DBB was 11. The removal efficiency was higher under alkaline conditions than acidic conditions. The principal products of 4, 4′-DBB decomposition was 4-monobromobiphenyl, biphenyl and benzene derivatives. The reaction of photocatalytic degradation of 4, 4′-DBB by fixed photocatalyst TiO2 thin film obeyed one stage reaction dynamics, the reaction rate constant also decreased with the increase of initial 4, 4′-DBB concentration.
4 , 4′-dibromobiphenyl (4,4′- DBB) TiO2 thin film Photocatalytic
Caihong Ji Ping Zhang
college of Science, Nanjing University of Technology, Nanjing 210009
国际会议
北京
英文
20-27
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）