细菌纤维素负载稀土掺杂二氧化钛复合膜的制备和光催化性能

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TiO_2/BC复合膜中;掺杂TiO_2的晶型为锐钛矿型;掺杂稀土的TiO_2/BC复合膜的光催化活性比未掺杂的有较大提高;铈掺杂的TiO_2/BC复合膜的光催化性能优于镧掺杂的;Ce~(4+)掺杂的最适浓度为2 mmol/L,而La~(3+)掺杂的最适浓度为5 mmol/L;稀土掺杂的TiO_2/BC复合膜对甲基橙溶液重复降解5次的降解率仍高于70%。

Preparation and Photocatalysis Performances of Bacterial Cellulose/TiO2 Composite Membranes Doped by Rare Earth Elements

The composite membrane of TiO_2/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 TiO_2/BC membrane;the resulting titanium dioxide is anatase type.Compared with a pure TiO_2/BC membrane,photocatalysis efficiency of the doped one is si...