Fe_(3)O_(4)/GO磁性纳米材料的合成及其对龙胆紫染料的吸附研究

Synthesis of Fe_(3)O_(4)/GO magnetic nanomaterials and their adsorption of gentian violet dye

采用水热法合成了Fe_(3)O_(4)/GO磁性纳米复合材料,对其进行X射线衍射(XRD)、红光谱(FT-IR)、扫描电镜(SEM)表征及磁性能测试,并应用于水体6种不同染料的吸附对比,筛选出对该吸附剂具备较强选择性吸附能力的龙胆紫(GV)染料,进一步优化吸附条件,最后对吸附剂的循环应用效果进行了测试。结果表明:所制备的Fe_(3)O_(4)/GO磁性纳米材料对GV的最佳吸附条件为温度20℃、染料初始浓度为30mg/L,吸附剂投加量0.04g/50mL,溶液pH=9、吸附时间30min。在最佳条件下,Fe_(3)O_(4)/GO对GV的移除率高达91.06%,吸附量为34.35mg/g。5次循环利用的移除率仍可达到68.46%。该吸附剂能很好地分散在水中,并可通过磁场从废水中实现快速回收,具有绿色、高效、可循环利用的特点,可用于工业废水处理系统。

In this study,Fe_(3)O_(4)/GO magnetic nanocomposite material was successfully synthesized by hydrothermal method.It was characterized by XRD,FT-IR,SEM and magnetic property test,and then applied to the adsorption of six various dyes in water.By comparison,gentian violet(GV)dye with strong selective adsorption capacity for the adsorbent was selected,and the adsorption conditions were further optimized.Finally,the cycling application effect of the adsorbent was tested.The results showed that the optimal adsorption conditions of the prepared Fe_(3)O_(4)/GO magnetic nanomaterials for GV were as follows:temperature of 20℃,initial concentration of dye 30mg/L,adsorbent dosage of 0.04g/50mL,pH=9,and adsorption time of 30 min.Under the optimal conditions,the removal rate of GV by Fe_(3)O_(4)/GO was 91.06%,and the adsorption capacity was 34.35mg/g.The removal rate after 5 cycles could still reach 68.46%.The adsorbent was well dispersed in water and could be quickly recovered from wastewater by magnetic field.It was green,efficient and recyclable,and could be used in industrial wastewater treatment system.