磁场TiO2光催化耦合降解酸性大红3R的研究

将磁场引入到TiO2光催化降解酸性大红3R的反应中，研究磁场对TiO2光催化的耦合作用，并讨论了磁场强度、反应时间、催化剂用量、反应物初始浓度等因素对TiO2光催化活性的影响．结果表明：外加磁场对光催化反应有明显的影响作用．0．04T磁场的作用强化了TiO2光催化对酸性大红3R的降解作用，在光催化反应180min后，酸性大红3R的降解率从80％提高到96．4％．反应时间、催化剂用量、通气量以及紫外光照距离的增加均有利于磁场TiO2光催化降解酸性大红3R降解率的提高．酸性大红3R溶液的性质也影响着磁场TiO2光催化反应的降解率，酸性大红3R初始浓度增大，磁场光催化降解率降低；酸性大红3R初始pH值在中性的条件下降解率较低，酸性和碱性环境均有利于酸性大红3R的光催化降解．

Study on Photocatalytic Degradation of Acid Red 3R by Titanium Dioxide Coupling with Magnetic Field

The photocatalytic degradation of acid red 3R catalyzed by TiO2 was investigated in a magnetic field. Some factors, which affect the degradation efficiency of photocatalytic reaction, such as magnetic field intensity, photocatalysts dosage, reaction time, air inflation, concentration and pH of acid red 3R, and light distance were studied. The results show that the magnetic field improves the photocatalytic degradation rate. The photodegradation rate of acid red 3R is increased from 80% to 96.4% when the reaction proceeded under the magnetic field of 0.04 T for 180 min. The degradation rate is improved with the increase of TiO2 dosage, reaction time, air inflation, and light distance. It decreases with the increase of the initial concentration of acid red 3R solution. The rate gets down to the lowest in neutral pH solution and increases at both acid and basic pH range.