芒果皮绿色合成贝壳基纳米零价铁及对甲基橙的去除

Green synthesis of shell-supported nano zero-valent iron using mango peer extract and the application for removal of methyl orange

为合理利用芒果皮和贝壳类废弃物资源并有效缓解水体中甲基橙的污染问题,利用废弃芒果皮和贝壳绿色合成贝壳基纳米零价铁复合材料.利用Folin-Ciocalteu法、1,1-二苯基-2-三硝基苯肼(DDPH)自由基清除能力和铁还原能力以及紫外-可见光谱(UV-Vis)测试结果优化材料制备工艺,并利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、红外光谱(FTIR)表征材料结构,同时研究了材料对水中甲基橙的去除效果.结果表明:利用芒果皮提取液成功制备了纳米零价铁,其大多为球形和椭圆形颗粒;负载贝壳后有效地分散并稳定了纳米粒子,降低了纳米零价铁的聚集程度;当反应温度为45℃,投加量4 g/L,甲基橙初始质量浓度为800 mg/L时,贝壳基纳米零价铁对于甲基橙的去除率达到93.66%.

In order to utilize waste resources as mango peel and shell rationally and alleviate the pollution of methyl orange waste water effectively,the shell-supported nano zero-valent iron were synthesized by mango peel extracts and shells.The preparation process was optimized by Folin-Ciocalteu method,1,1-diphenyl-2-trinitr-ophenylhydrazine radical scavenging capacity,iron reducing capacity and UV-Visible spectrophotometer(UV-Vis).Characterization of the synthesized materials was done by scanning electron microscopy(SEM),X-ray diffractometer(XRD)and Fourier Transform Infrared spectroscopy(FTIR),and its potential for treating methyl orange waste water was also studied.The results revealed that iron nanoparticles,mostly spherical and elliptical particles,were prepared successfully by mango peel extracts and its aggregation degree was effectively reduced by shell after being supported.The removal efficiency of methyl orange by shell-based nano zero-valent iron reached 93.66%under the condition of reaction temperature of 45℃,dosage of 4 g/L and initial concentration of MO of 800 mg/L.