纳米四氧化三铁碳片对亚甲基蓝废水的催化脱色  

Enhanced catalytic degradation of methylene blue on carbon sheet loaded nanoscale ferrosoferric oxide in wastewater

作　　者：陈海峰[1] 袁欣蕊 陈康佳 CHEN Hai-feng;YUAN Xin-rui;CHEN Kang-jia(Jiangsu Engineering Center of the Pesticide Wastewater Treatment and Resource Reuse,School of Pharmaceutical and Environmental Engineering,Nantong Vocational University,Nantong 226007,China)

机构地区：[1]江苏省农药废水处理及资源化利用工程研究中心,南通职业大学药品与环境工程学院,江苏南通226007

出　　处：《化学研究与应用》2023年第7期1609-1616,共8页Chemical Research and Application

基　　金：南通市科技项目(JC2021158)资助。

摘　　要：碳材料上掺杂纳米Fe_(3)O_(4)颗粒所形成的复合材料可发挥各自优点,进而拓宽其在印染废水处理中的应用。以葡萄糖和氯化铁为原料,通过共沉淀后碳化煅烧,成功制备了纳米四氧化三铁碳片(Fe_(3)O_(4)@GC),利用XRD、TEM、BET和磁滞回线对Fe_(3)O_(4)@GC碳片进行了形貌表征,并将其用于亚甲基蓝(MB)废水的催化脱色处理。结果表明,Fe_(3)O_(4)@GC碳片上的Fe_(3)O_(4)结晶性较好,颗粒呈球形且分散均匀,其平均粒径为22 nm。Fe_(3)O_(4)@GC碳片能够活化H_(2)O_(2)产生氢氧自由基(HO·)并高效氧化降解MB。在pH为2~3,材料投加量为1.0 g/L,H_(2)O_(2)用量为9 mmol/L的条件下,60min内Fe_(3)O_(4)@GC碳片能将浓度为20 mg/L的MB完全脱色去除,且去除反应符合准二级动力学方程(R~2=0.9991)。Fe_(3)O_(4)@GC碳片具有较强的顺磁性,可以从废水中快速磁分离回收,循环使用6次后,MB的脱色率仍然能达到95.6%。自由基猝灭试验证明,MB的脱色去除中Fe_(3)O_(4)@GC碳片诱导的HO·氧化降解起到主导作用,碳材料的表面吸附也起了一定的协同作用。该方法为MB废水高效快速脱色去除提供了实践参考。Advantages of the composite materials doped with nano-Fe_(3)O_(4)particles and carbon can broaden their application in the treatment of dyeing wastewater.Carbon sheets loaded nanoscale ferrosoferric oxide(Fe_(3)O_(4)@GC)were prepared by co-precipitation and carbonization calcination with glucose and ferric chloride as raw materials.The structure and morphology of Fe_(3)O_(4)@GC was characterized by a series of techniques including XRD,TEM,BET and hysteresis cycle.The catalytic decolorization of methylene blue(MB)in wastewater were investigated.The results show that Fe_(3)O_(4)particles on the Fe_(3)O_(4)@GC were spherical and evenly dis-persed,with an average particle size of 22 nm.Fe_(3)O_(4)@GC efficiently activated H_(2)O_(2)to generate oxygen free radicals and degraded MB in wastewater by Fenton-like system.The decolorization efficiency 20mg/L MB activated by Fe_(3)O_(4)@GC reached 100%in 60 min when the dosage of Fe_(3)O_(4)@GC was 1.0g/L,the dosage of H_(2)O_(2)was 9 mmol/L and the solution pH was 2-3.The removal reac-tion of methylene blue by Fe_(3)O_(4)@GC composites is consistent with the pseudo-second-order kinetic equation model(R^(2)=0.9991).Fe3O4@GC had strong paramagnetic properties and were quickly separated from wastewater under the action of magnetic force.The decolorization rate of Fe3O4@GC still remained at 95.6%after reused for six times by magnetic separation,which showed their superi-or degradation performance.The free radical quenching test showed that HO·induced by Fe3O4@GC played an important role in the decolorization process of MB,and the surface adsorption of carbon material also played a synergistic role.The study proved that Fe3O4@GC promoted the activation of H2O2 to efficiently degrade MB and then provided a new idea for removal of MB wastewater.

关 键 词：印染废水 纳米四氧化三铁 碳基材料 类芬顿反应 

分 类 号：O614.8[理学—无机化学]