Synthesis of magnetic ZnO/ZnFe2O4 by a microwave combustion method, and its high rate of adsorption of methylene blue

The magnetic ZnO/ZnFe2O4 particles have been synthesized by a microwave combustion method using NaAc as fuel. The as-obtained ZnO/ZnFe2O4 was characterized and applied for the removal of methylene blue (MB) from aqueous solution in the batch system. The ZnO/ZnFe2O4 particles display larger S-BET and smaller size with increase of NaAc dosage. Because a certain amount of gas is generated during NaAc decomposing and the gas prevent the particles from growing larger. More interestingly, even at neutral pH value, the ZnO/ZnFe2O4 obtained with 24 mL NaAc shows high-rate adsorption properties with the MB removal efficiency up to 90% in 0.5 mm and a maximum adsorption capacity of 37.27 mg/g. (C) 2014 Elsevier Inc. All rights reserved.

以醋酸钠（NaAc）为燃料，通过微波燃烧法合成了磁性ZnO/ZnFe₂O₄颗粒。对所获得的ZnO/ZnFe₂O₄进行了表征，并将其应用于间歇体系中从水溶液中去除亚甲基蓝（MB）。随着醋酸钠用量的增加，ZnO/ZnFe₂O₄颗粒呈现出更大的比表面积（S - BET）和更小的尺寸。因为在醋酸钠分解过程中会产生一定量的气体，气体阻止了颗粒长大。更有趣的是，即使在中性pH值下，用24 mL醋酸钠制备的ZnO/ZnFe₂O₄也显示出高速吸附性能，在0.5小时内亚甲基蓝去除率高达90%，最大吸附量为37.27 mg/g。（C）2014爱思唯尔公司。保留所有权利。