钙钛矿型复合氧化物降解染料废水的性能研究

以A,B的硝酸盐为原料,以氨水或碳酸钠为沉淀剂,利用混合沉淀的方法合成了系列钙钛矿型氧化物(ABO3)。合成中A选碱土金属元素Mg,Ca,Sr,Ba等及稀土金属元素La;B选过渡金属元素Cr,Mn,Fe,Co,Ni等。以酸性红B染料废水为目标物,考察了不同种ABO3复合氧化物光催化活性。活性测试结果表明,A的影响较小,B的影响较显著,总的变化趋势是随着B原子序数的增大光催化活性提高。在上述各催化剂中,SrNiO3的催化活性最高。TEM测试结果显示所合成SrNiO3为纯度较高的粒径为150~200 nm的近球形颗粒。考察了工艺条件对光催化降解酸性红B的影响:在废水溶液中加入H2O2后光催化活性提高,且随着加入量的增大有增长的趋势;提高溶液酸性有利于染料废水降解;酸性红B废水溶液初始质量浓度越高,光催化越难降解。

Study of perovskite type oxide degradation of textile wastewater

A series of perovskite oxides are synthesized by means of blend deposition using the nitrate of A and B as the raw materials,and ammonia or sodium carbonate as sedimentation.A includes alkaline,earth metals such as Mg,Ca,Sr,Ba and rare-earth metals La;while B includes transition metal Cr,Mn,Fe,Co and Ni.The results of activity evaluation indicate that the effect of A is low while the effect of B is comparatively remarkable,and the photocatalytic activity improves with the increases of atomic number as a whole.The activity of SrNiO_3 is the highest among the above photocatalysts.The test result of TEM shows that the particle shapes an approximately round ball whose diameter is in the range of 150～200 nm.The effects of experimental condition on photocatalytic degradation of acid red B are studied.The photocatalysis is improved by adding H_2O_2 into the solution and the activity is raised with the increase of the amount of H_2O_2.Increasing the acidity of the solution helps decompose acid red B.The higher the initial concentration of acid red B,the more difficult the photocatalysis.