MnO_(x)@Fe_(3)O_(4)复合材料制备及其对苯酚处理性能研究

Preparation of Magnetic Nano-MnO_(x)@Fe_(3)O_(4) Composite and Its Treatment Performance of Phenol

首先采用两步法设计制备磁性纳米复合材料MnO_(x)@Fe_(3)O_(4),然后测量其粒度的分布状态,再通过扫描电镜(SEM)、X-射线衍射(XRD)和红外光谱(IR)3种方法表征其结构形态;初步研究了纳米复合物分子MnO_(x)@Fe_(3)O_(4)结构与组成,深入分析了该磁性纳米复合材料的添加量和改变苯酚的初始浓度对该复合材料活化PMS分解苯酚性能的影响,并研究了纳米复合材料MnO_(x)@Fe_(3)O_(4)循环使用的效果。结果表明,纳米复合材料MnO_(x)@Fe_(3)O_(4)是α-MnO 2表面负载四氧化铁(Fe_(3)O_(4))的复合材料,平均粒径为247.3 nm,磁分离性好;纳米复合材料MnO_(x)@Fe_(3)O_(4)有较好的活化PMS分解苯酚的效果,在处理初始浓度为10 mg/L的酚类废水,添加80 mg/L该复合材料,用时180 min效果明显,去除率达到100%;随着苯酚的浓度逐渐提高,同一添加量的MnO_(x)@Fe_(3)O_(4)活化PMS分解去除效果会下降;MnO_(x)@Fe_(3)O_(4)活化PMS循环使用效果较好,对10 mg/L的苯酚废水,反复使用6次,还有90%以上的去除率。

Nano-MnO_(x)@Fe_(3)O_(4)composite was designed and prepared by two-step method,and the particle size distribution was measured.The structural morphology was analyzed by scanning electron microscope(SEM),X-ray diffraction(XRD)and infrared spectrum(IR)three methods.The structural composition of nano-MnO_(x)@Fe_(3)O_(4)composite was preliminarily discussed.The effects of the addition amount of nano-MnO_(x)@Fe_(3)O_(4)composites and different initial concentrations of phenol on the performance of nano-MnO_(x)@Fe_(3)O_(4)-activated PMS to decompose phenol were investigated,and the effect of recycling nano-MnO_(x)@Fe_(3)O_(4)composites was also studied.The results showed that the nano-MnO_(x)@Fe_(3)O_(4)composite material was a composite material with iron tetroxide(Fe_(3)O_(4))loaded on the surface ofα-MnO 2,the average particle size was 247.3 nm,and the magnetic separation was excellent;the nano-MnO_(x)@Fe_(3)O_(4)composite material had a good effect of activating PMS to decompose phenol.The addition amount of 80 mg/L can reach 100%removal rate of phenol waste with a concentration of 10 mg/L in 180 min.When the initial concentration of phenol increased,the decomposition effect of the same amount of nano-MnO_(x)@Fe_(3)O_(4)activated PMS will decrease.The recycling effect of nano-MnO_(x)@Fe_(3)O_(4)activated PMS was better,which can be reused 6 times to deal with the phenol waste with an initial concentration of 10 mg/L.Over 90%removal rate was still obtained.