尖晶石铁氧体的掺杂改性及催化性能

Doping Modification and Catalytic Properties of Spinel Ferrite

本文使用蛋清和金属盐作为原料,采用溶胶-凝胶法合成一系列尖晶石铁氧体及其不同含量的掺杂型铁氧体催化剂。包括MnFe_2O_4和不同含量的Cu掺杂改性的Cu_xMn_(1-x)Fe_2O_4;不同含量的Co掺杂的Co_xMn_(1-x)Fe_2O_4;MgFe_2O_4和不同含量的Co掺杂改性的Co_xMg_(1-x)Fe_2O_4;NiFe_2O_4和不同含量的Co掺杂改性的Co_xNi_(1-x)Fe_2O_4。在相同实验条件下,将催化剂应用于催化过硫酸盐(PMS)降解双酚A(BPA)。结果表明,不同的元素掺杂改性不同铁氧体中,Co掺杂的CoxNi(1-x)Fe_2O_4具有最优的催化性能。在催化剂投量为0.1 g/L,PMS浓度为0.02 mmol/L;BPA浓度为10μmol/L,p H为中性,反应60 min时,Co_(0.2)Ni_(0.8)Fe_2O_4的催化性能最好,BPA的降解去除率约为70%。

A series of spinel ferrites and their doped ferrite catalysts of different contents were synthesized with from egg white and metal salt by sol-gel method, including MnFe204 and modified CuxMnl-xFe2O4 by doping with Cu of different contents, modified CoxMnl-xFe2O4 by doping with Co of different contents, MgFe2O4 and modified CoxMgl-xFe2O4 by doping with Co of different contents, and NiFe2O4 and modified CoxNil-xFe2O4 by doping with Co of different contents. Under the same test conditions, catalysts were used catalyze persulfate （PMS） to degrade bisphenol A （BPA）. The results show that, among different modified ferrites by doping with different elements, Co-doped CoxNi （l-x）Fe2O4 has the best catalytic performance. The catalytic performance of Co0.2Ni0.8F%O4 is the best and the removal rate of BPA is about 70%,with a catalyst dosage of 0.1 g/L, a PSM concentration of 0.02 mmol/L, a BPA concentration of 10 μmol/L, pH of 7, and reaction time of 60 min.