应用紫外?可见光谱（ UV?VIS）、质谱（ MS）和电子顺磁共振（ EPR）对甲基橙印染废水在Fe?Cu铁内电解中的变化进行跟踪表征．研究结果表明， pH＝3时，甲基橙在 Fe?Cu （质量比1∶1）和 Fe?Cu?Mn （质量比1∶1∶0．05）铁内电解体系中随着反应时间的增加在400—600 nm区域UV?VIS吸收峰面积逐渐减少；Fe?Cu?Mn （质量比1∶1∶0．05）吸收峰迅速蓝移至350—550 nm区域，且吸收峰面积也逐渐减少． MS正负离子模式测得甲基橙准分子离子峰强度逐渐减小，但相应还检测到由于甲基橙分子断裂引起的逐渐变多的诸如芳香类和苯环裂解后共轭二烯物质的碎片信息． EPR检测到Fe3＋、Fe2＋的信号略有增加，在Fe?Cu?Mn（质量比1∶1∶0．05）中Mn2＋的6条超精细结构谱峰由弱转强．这些研究表明，在Fe?Cu铁内电解中甲基橙降解的原因之一是氧化还原反应破坏发色基团，即偶氮双键的消失，引起甲基橙溶液脱色；另一原因是在微电场中，甲基橙分子断裂为更小质荷比的分子离子碎片而引起甲基橙脱色降解，这些研究结果为探索甲基橙溶液在铁内电解中脱色、降解机理提供有力的理论依据．
The change of methyl orange in Fe?Cu iron internal electrolyzer was examined by UV?ViS, MS and EPR. The results showed that UV?ViS absorption peak in the range of 400—600 nm decreased with the increase of the reaction time in Fe?Cu ( mass ratio 1∶1 ) and Fe?Cu?Mn ( mass ratio 1∶1∶0.05) iron internal electrolyzer when the solution pH was 3. Positive and negative ion mode MS displayed that the quasi?molecular or ion peaks of methyl orange gradually decreased, but the fragments produced by the degradation of methyl orange were detected. EPR signals assigned to Fe2+and Fe3+ increased slightly and the six fine peaks assigned to Mn2+ changed from weak to strong signal. These results indicated that one of the degradation routes of methyl orange is that the azo double bond was destroyed by oxidation?reduction reaction in Fe?Cu iron internal electrolyzer, which results in the decoloration of methyl orange. Another route was that in weak electric field, methyl orange was broken down to smaller fragments with lesser m/z. It is helpful to explore the efficiency of catalytic degradation and the degradation mechanism in the decoloration of methyl orange in iron internal electrolyzer.
参考文献
| [1] | 钱霍飞,王安,蒋红.纺织行业常见受限物质的危害和法规要求及其替代--偶氮染料[J].中国纤检,2013(14):85-88. |
| [2] | 王莉,李琛琛,蒋海兵.Citrobacter sp.LW-3对偶氮染料甲基橙的降解脱色特性研究[J].环境科学学报,2014(9):2213-2218. |
| [3] | Saratale, R.G.;Saratale, G.D.;Chang, J.S.;Govindwar, S.P. .Bacterial decolorization and degradation of azo dyes: A review[J].Journal of the Taiwan Institute of Chemical Engineers,2011(1):138-157. |
| [4] | Ghodake G S;Telke A A;Jadhav J P et al.Potential of brssica juncea in order to treat textile effluent contaminated sites[J].International Journal of Phytoreme,2009,11:1-13. |
| [5] | 刘霞,卢毅明,马鲁铭.催化铁内电解反应床对水中酸性红B的脱色研究[J].环境工程学报,2009(01):98-102. |
| [6] | 司婧,邓欢欢,薛早早,王濛濛,葛利云,袁陈聪.铁铜内电解-膨润土组合工艺处理含铬废水[J].环境科学与管理,2011(05):71-74. |
| [7] | 王俊钧,蒋进元,胡翔,周岳溪,常风民.铁铜内电解处理二步湿法腈纶聚合单元废水[J].环境工程学报,2011(06):1297-1300. |
| [8] | 卢永,严莲荷,李兵,周申范.镀铜铁内电解预处理焦化废水的研究[J].精细化工,2008(03):269-272. |
| [9] | 陈鸿博;林昌健;孙岚 等.铁内电解催化剂及其制备方法[P].中国,101934230B,2010-10. |
| [10] | 孙岚,李静,王成林,林昌健,杜荣归,陈鸿博.钛基TiO2纳米管阵列电极的光电催化性能[J].无机化学学报,2009(02):334-338. |
| [11] | 裘祖文.电子自旋共振波谱[M].北京:科学出版社,1980:22-311. |
| [12] | Altshuler T S;Bresler M S;Goryunov Y V .Investigation of ESR on Fe ions in Kondo Dielectric SmB6[J].Journal of Superconductivity and Novel Magnetism,2007,20(2):127-130. |
| [13] | 姜招峰;郑荧光;杨翰仪 等.O@-2损伤过氧化氢酶过程中辅基Fe(Ⅲ) 的ESR 波谱[J].青岛海洋大学学报,1998,28(2):259-262. |
| [14] | 王海人;石兴阳;付亚平 等.镀铜铁内电解法用于甲基橙的脱色研究[J].环境科学与技术,2010,33(12F):319-321. |
| [15] | 张刚生,谢先德,温桂兰,彭金莲.珍珠层中的锰及其电子顺磁共振谱特征[J].海洋科学,2003(04):44-48. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%