以细菌纤维素(BC)为载体, 用溶胶－凝胶法原位生成稀土镧和铈元素(La, Ce)掺杂的二氧化钛复合膜, 以甲基橙为目标降解物, 考察了复合膜的光催化活性。结果表明: 稀土元素已引入TiO2/BC复合膜中; 掺杂TiO2的晶型为锐钛矿型; 掺杂稀土的TiO2/BC复合膜的光催化活性比未掺杂的有较大提高;铈掺杂的TiO2/BC复合膜的光催化性能优于镧掺杂的; Ce4+掺杂的最适浓度为2 mmol/L, 而La3+掺杂的最适浓度为5 mmol/L; 稀土掺杂的TiO2/BC复合膜对甲基橙溶液重复降解5次的降解率仍高于70%。
The composite membrane of TiO2/BC(bacterial cellulose) doped with rare earth elements was prepared by a sol-gel method using tetraisopropyl titanate as starting materials and BC as the support. Photocatalysis performances of the membrane were estimated by using methyl orange as a degradation agent. The results show that rare earth ions are incorporated into TiO2/BC membrane; the resulting titanium dioxide is anatase type. Compared with a pure TiO2/BC membrane, photocatalysis efficiency of the doped one is significantly enhanced. The degradation rate of methyl orange solution for the composite membrane doped with Ce4+ is higher than that of membrane doped with La3+. The optimal dosage of Ce4+ is 2 mmol/L, while the most suitable concentration of La3+ is 5 mmol/L. The degradation rate of methyl orange solution is above 70% after degradation for five times.
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