摘要
采用超声沉淀法合成Fe_3O_4/GO复合材料,通过SEM、XRD、FTIR和VSM对Fe_3O_4/GO复合材料的形貌、结构和磁性进行表征,通过对甲基橙溶液的吸附实验考察p H值、吸附剂添加量、吸附时间等因素对Fe_3O_4/GO复合材料吸附效果的影响,并进行了吸附动力学和等温吸附模型拟合.结果表明:Fe_3O_4与GO成功复合,Fe_3O_4/GO复合材料具有超顺磁性,在外在磁场的作用下可实现吸附剂与吸附质的快速分离;pH>3.5时,染料去除率随着pH值增大呈下降趋势;随着吸附剂添加量增大,染料去除率逐渐增大;随着吸附时间增加,染料去除率先急剧上升,然后上升幅度趋缓直至达到吸附平衡;Fe_3O_4/GO复合材料对甲基橙的吸附符合准二级动力学模型和Langmuir模型,为化学单层吸附;pH为3左右,温度为298 K时,Fe_3O_4/GO复合材料对甲基橙的最大吸附容量可达139.7 mg/g.
Fe3O4/GO composite was prepared by precipitation under ultrasonic radiation, the morphology, chemical structure and magnetic properties of composites are characterized by SEM, XRD, FTIR and VSM. Batch experiments were carried out to investigate the effects of solution pH, adsorbent dosage, contact time on sorption efficiency and the adsorption kinetics, isothems were investigated. The results showed that Fe3O4/GO composite with paramagnetic property was prepared successfully by compositing Fe3O4 with GO, so that it could be utilized as an magnetically separable adsorbent under external magnetic field; when pH 〉 3.5, dye removal rate decreased as the pH was increased;the removal of dye increased with the increase of the adsorbent dosage;the removal efficiency of dye grew fast at the initial stage, then increased slowly, and adsorption equilibrium appeared at last state; the adsorption equilibrium data of methyl orange dyes on to the Fe3O4/GO adsorbent surface showed good correlation with psudo-second-order model and Langmuir isotherm models, which revealed that the adsorption process is spontaneous and chemical; The maximum adsorption capacity of Fe3O4/GO composite for methyl orange was 139.7 mg/g when pH=3 and T=298 K.
出处
《天津工业大学学报》
CAS
北大核心
2016年第4期28-33,共6页
Journal of Tiangong University
基金
国家自然科学基金资助项目(51378350
21176171)
