| 石墨烯负载铁锰氧化物活化过一硫酸盐降解金橙G |
| 摘要点击 4364 全文点击 1216 投稿时间：2017-09-18 修订日期：2017-11-06 |
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| 中文关键词 石墨烯 铁锰氧化物 活化剂 过一硫酸盐 金橙G |
| 英文关键词 graphene manganese ferrite activator peroxymonosulfate orange G |
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| 中文摘要 |
| 利用水热法制备了rG-MnFe2O4活化剂，通过TEM、XRD、FT-IR、Raman等手段对活化剂进行了系统表征，通过其对偶氮染料OG的降解实验评价了rG-MnFe2O4活化PMS的效果，同时考察了PMS浓度、rG-MnFe2O4投加量、初始pH、Cl-浓度对OG降解效果的影响.结果表明，当rG-MnFe2O4投加量为0.3 g·L-1，n（PMS）∶n（OG）=40∶1时，rG-MnFe2O4活化PMS的效果显著，反应27 min时，OG降解率为100%，并且随PMS浓度、rG-MnFe2O4投加量的提高，OG降解效率明显增加.初始pH对OG降解有较大影响，pH=5.00时效果最好.Cl-对活化降解OG具有促进作用，Cl-浓度越高，OG降解得越快.rG-MnFe2O4在重复使用5次时仍具有较好活化性能.通过紫外可见光谱和气相色谱-质谱（GC/MS）对OG降解过程进行分析，表明OG分子中的萘环结构和偶氮键均被破坏，并检测出主要降解产物有对硝基苯酚和邻苯二甲酸；且rG-MnFe2O4/PMS降解体系对染料OG具有一定的矿化率. |
| 英文摘要 |
| The rG-MnFe2O4 was synthesized by hydrothermal method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Raman spectra. The rG-MnFe2O4 was used to activate peroxymonosulfate (PMS) to decolorize azo dyes, e.g., Orange G, and the effect of PMS dosage, rG-MnFe2O4 loadings, initial pH, and the concentration of Cl- were investigated. The results indicated that the degradation rate of OG was 100% within 27 min with 0.3 g ·L-1 of rG-MnFe2O4 and at a 40:1 of PMS:OG molar ratio. The decolorization efficiency of OG increased with increasing PMS concentration and increasing rG-MnFe2O4 dosage. The initial pH had a significant effect on OG degradation, and pH 5.00 was most favorable for its decolorization. In addition, the addition of Cl- accelerated the decolorization of OG, and the decolorization rate increased with increasing concentration of Cl-. The rG-MnFe2O4 also exhibited an excellent reusability, and its activation of PMS was still observed after five rounds of tests. From the analysis of UV-vis spectra and gas chromatography-mass spectrometry (GC/MS), the naphthalene ring and azo band were found to be destroyed, with p-nitrophenol and phthalic acid as the main degradation products. Finally, a TOC analysis indicated that a certain degree of OG mineralization was obtained in the rG-MnFe2O4/PMS system. |
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