Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, PR China.
J Colloid Interface Sci. 2011 Jan 15;353(2):524-9. doi: 10.1016/j.jcis.2010.09.050. Epub 2010 Oct 25.
Porous spinel ferrites Mn(1-x)Zn(x)Fe(2)O(4) (0 ≤ x ≤ 0.8) are synthesized by a simple sol-gel method with egg white. All samples exhibit porous morphologies and large BET surface area (S(BET)). The substitution of Zn(2+) affects the magnetic properties of ferrites and the adsorption properties of methylene blue (MB) on ferrites, obviously. The saturation magnetization (Ms) of Mn(1-x)Zn(x)Fe(2)O(4) increases before x=0.4, and decreases with further increase of Zn(2+) substitution. This can be ascribed to the changes of the cationic distribution and the variation of spin arrangement in A-site and B-site of spinel structure. All samples show high adsorption capacity and the removal efficiencies of MB reach up to >90% within 3 h. The Zn(2+) substitution accelerates the adsorption rate and capacity of MB on Mn(1-x)Zn(x)Fe(2)O(4). The quickest adsorption occurred at x=0.2 and the largest adsorption capacity occurred at x=0.8.
采用简单的蛋清溶胶-凝胶法合成了多孔尖晶石铁氧体 Mn(1-x)Zn(x)Fe(2)O(4)（0 ≤ x ≤ 0.8）。所有样品均呈现多孔形貌和较大的 BET 比表面积（S(BET)）。Zn(2+)的取代明显影响了铁氧体的磁性能和对亚甲基蓝（MB）的吸附性能。Mn(1-x)Zn(x)Fe(2)O(4)的饱和磁化强度（Ms）在 x=0.4 之前增加，然后随着 Zn(2+)取代的进一步增加而降低。这可以归因于 A 位和 B 位尖晶石结构中阳离子分布的变化和自旋排列的变化。所有样品均表现出较高的吸附容量，MB 的去除效率在 3 h 内高达>90%。Zn(2+)取代加速了 MB 在 Mn(1-x)Zn(x)Fe(2)O(4)上的吸附速率和容量。在 x=0.2 时出现最快的吸附，在 x=0.8 时出现最大的吸附容量。
