天然矿物材料非均相Fenton反应评价与优化

发布时间：2018-01-14 04:13

  本文关键词：天然矿物材料非均相Fenton反应评价与优化　出处：《哈尔滨理工大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 非均相Fenton反应 天然矿物 麦饭石 电气石 响应曲面法

【摘要】：非均相Fenton技术对有机废水具有较好的降解效果,最近几年吸引了越来越多学者的关注。本研究以天然矿物材料麦饭石和铁电气石为原材料,采用液相沉积法在麦饭石表面原位生长磁性纳米Fe_3O_4颗粒(MFM),采用低温烧结法制造多孔电气石陶粒(PSC),以这两种材料作为非均相Fenton催化剂。运用X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、Zeta电位仪和振动磁强计(VSM)等测试技术对MFM和PSC样品进行表征。以有机染料甲基橙(MO)和亚甲基蓝(MB)为目标污染物,评价这两种材料的非均相Fenton反应效能,并采用响应曲面法(RSM)对工艺参数进行优化分析。对于MFM非均相催化剂,分析测试结果表明:Fe_3O_4粒子分布均匀,通过化学键连接,Fe_3O_4生长牢固,具有较强的磁性能,能够通过外加磁铁迅速分离。当以85%的Fe_3O_4含量,95 oC的水浴温度,3 h的合成时间,制备的MFM复合催化剂用量为1 g/L时,对MO染液的脱色率达84.61%。效能评价结果表明:随着溶液初始pH值、初始H_2O_2浓度的增加,MO有机染料的脱色率呈现先上升后下降的趋势;随着MFM用量、反应温度的增加MO有机染料的脱色率逐渐提高;随着MO有机染料初始浓度的变大,MO的脱色率减小。RSM优化分析表明:pH值3.1、H_2O_2浓度14.98 mM,催化剂用量2.13 g/L、反应时间120 min,此条件下MO有机染料的实际脱色率为81%,与预测值81.75%相对误差为0.75%,表明模型的准确可靠性高。对于PSC非均相Fenton催化剂,分析测试结果表明:多孔电气石陶粒表面疏松多孔。效能评价结果表明:当溶液的初始pH值、初始H_2O_2浓度增加时,MB的脱色率先上升后下降;而当催化剂用量、反应温度增加时,MB的脱色率逐渐上升;随着MB浓度的增加,MB的脱色率呈减小趋势。RSM优化分析表明:pH值2.41、H_2O_2浓度为9.85 mM,催化剂用量6.98 g/L、反应时间99 min,此条件下的MB实际脱色率为99.65%,与预测值100.05%的相对误差为0.4%,说明模型的准确可靠性高。
[Abstract]:Heterogeneous Fenton technology has a good degradation effect on organic wastewater, which has attracted more and more attention of scholars in recent years. In this study, the natural mineral materials Maifanite and ferrotourmaline were used as raw materials. Magnetic nanocrystalline Fe_3O_4 particles were grown in situ on the surface of Maifan stone by liquid phase deposition. Porous tourmaline ceramics were prepared by low temperature sintering. The two kinds of materials were used as heterogeneous Fenton catalysts. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used. Transmission electron microscopy (TEM). The MFM and PSC samples were characterized by Zeta potentiometer and vibratory magnetometer. The organic dyes methyl orange and methylene blue were used as the target pollutants. The efficiency of heterogeneous Fenton reaction of these two materials was evaluated, and the process parameters were optimized by response surface method (RSM). For MFM heterogeneous catalyst. The results of analysis and test show that the particles of Fe3O _ 4 are evenly distributed, and the Fe3O _ 4 has strong magnetic properties. It can be separated quickly by applying magnets. When the synthesis time is 3 h at the water bath temperature of 95 鈩，

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