Solar-Fenton catalytic degradation of phenolic compounds by impure bismuth ferrite nanoparticles synthesized via ultrasound
Solar-Fenton catalytic degradation of phenolic compounds by impure bismuth ferrite nanoparticles synthesized via ultrasound
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DOI：
10.1016/j.cej.2014.04.021
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发表时间：
2014-09
影响因子：
15.1
通讯作者：
T. Soltani;M. Entezari
中科院分区：
文献类型：
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作者：
T. Soltani;M. Entezari
在这项工作中，用超声波合成的不纯铋铁氧体（BiFeO3）纳米颗粒研究了酚类化合物的非均相氧化。采用不同的技术对纳米颗粒进行了表征。不纯的纳米颗粒比纯的更有效。首次采用非均相太阳- fenton催化降解酚类化合物。在外加磁场作用下，酚类化合物完全降解，催化剂易于从溶液中分离。改善了Fenton反应存在的铁泥和Fe（II）离子再生缓慢等缺陷。在目前的工作中，一个多变量分析已经被用来评估条件，以获得完全降解的氧化剂和催化剂的浓度。采用响应面法（RSM）评价了两个主要因素（不纯bifeo3磁性纳米颗粒（BFO MNPS）的量和H2O2浓度）在制备过程中的影响。考察了苯酚初始浓度和初始pH值等其他变量的影响。苯酚在黑暗条件下发生部分氧化，在光照条件下60分钟内完全降解。在暗光条件下确定了Fenton催化降解机理。固体表面Fe（III）转化为Fe（II）生成羟基自由基（OHradical dot），可生成新的反应位点。考察了不同电子受体对非均相太阳- fenton催化降解苯酚的影响。此外，还首次评价了太阳- fenton催化降解4-氯苯酚（4- cp）、2,4,6-三氯苯酚（2,4,6- tcp）、联苯（BP）、4-硝基苯酚（4- np）、2,4 -二硝基苯酚（2,4 - DNP）和2,4,6-三硝基苯酚（2,4,6- tnp）等苯酚衍生物的性能。苯酚及其衍生物在低浓度H2O2的太阳光照下，在短时间内被太阳- fenton催化剂完全降解。
In this work, a heterogeneous oxidation of phenolic compounds was examined by impure bismuth ferrite (BiFeO3) nanoparticles synthesized by ultrasound. The nanoparticles were characterized by different techniques. The impure nanoparticles were more effective than pure one. The heterogeneous solar-Fenton catalytic degradation of phenolic compounds was used for the first time. A complete degradation of the phenolic compounds was achieved along with easy separation of the catalyst from the solution by an external magnetic field. The limitations of Fenton reaction such as iron sludge and slow regeneration of Fe(II) ions improved in this work. In the present work, a multivariate analysis has been used to assess the conditions for obtaining complete degradation in terms of the oxidant and catalyst concentrations. The response surface methodology (RSM) was performed to evaluate the effects of the two major factors (amount of impure BiFeO3magnetic nanoparticles (BFO MNPS) and concentration of H2O2) during the process. The effect of other variables such as initial concentration of phenol and initial pH was also examined. Partial oxidation of phenol took place at dark and a complete degradation was achieved at light in 60 min. The Fenton catalytic degradation mechanism was determined in dark and light. New reaction sites can be generated on the solid surface by the conversion of Fe(III) to Fe(II) for the generation of hydroxyl radical (OHradical dot). The effect of different electron acceptors on the heterogeneous solar-Fenton catalytic degradation of phenol was examined too. In addition, the solar-Fenton catalytic degradation of derivatives of phenol such as 4-chlorophenol (4-CP), 2,4,6-trichlorophenol (2,4,6-TCP), biphenyl (BP), 4-nitrorophenol (4-NP), 2,4 dinitrophenol (2,4 DNP) and 2,4,6-trinitrophenol (2,4,6-TNP) was evaluated for the first time. Phenol and its derivatives completely degraded under solar light irradiation by the solar-Fenton catalyst in a short time with low concentration of H2O2.