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Iron oxide nanoparticles supported on diamond nanoparticles as efficient and stable catalyst for the visible light assisted Fenton reaction
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-12-25 , DOI: 10.1016/j.apcatb.2017.12.060
Juan C. Espinosa , Cristina Catalá , Sergio Navalón , Belén Ferrer , Mercedes Álvaro , Hermenegildo García

Iron oxide nanoparticles (Feox NPs) have been supported on the hydroxylated surface of modified diamond nanoparticles (D3). Characterization data show that, once formed, Fe NPs are spontaneously oxidized under ambient conditions, exhibiting a good dispersion of small oxidized Feox NPs (2.2 ± 0.5 nm) on D3. It has been observed that the activity of Feox/D3 as heterogeneous Fenton catalyst for phenol degradation by H2O2 can be assisted by visible light irradiation. Feox/D3 exhibits a superior activity compared with analogous catalysts based on activated carbon, graphite or the benchmark Feox/TiO2 photocatalyst. Feox/D3 exhibits comparable activity to Ag/D3 that is one of the most active catalysts ever reported for this reaction. In addition, Feox/D3 presents higher stability and recyclability than analogous Cu/D3. A minimum accumulated turnover number of 38,000 can be achieved using Feox/D3 as photocatalyst. The heterogeneous photoFenton process using phenol as model pollutant and Feox/D3 as catalyst under visible light irradiation can be implemented prior to an aerobic biological treatment resulting in a biodegradable effluent which lacks ecotoxicity, as determined by measurement of the biological oxygen demand. Transient absorption spectroscopy provides evidence in support of the formation upon irradiation of Feox/D3 of photogenerated charge separation state attributed to electrons and holes. Electron paramagnetic resonance and selective quenching experiments indicate that hydroxyl radicals are the main reactive oxygen species generated in the photo-assisted Fenton reaction promoted by Feox/D3.



中文翻译:

负载在金刚石纳米颗粒上的氧化铁纳米颗粒作为可见光辅助Fenton反应的有效和稳定催化剂

氧化铁纳米颗粒(Fe ox NPs)已负载在改性金刚石纳米颗粒(D3)的羟基化表面上。表征数据表明,一旦形成,Fe NP就会在环境条件下自发氧化,在D3上表现出良好的小氧化Fe ox NP(2.2±0.5 nm)分散性。已经观察到Fe ox / D 3作为非均相Fenton催化剂对H 2 O 2降解苯酚的活性可以通过可见光照射来辅助。与基于活性炭,石墨或基准Fe ox / TiO 2光催化剂的类似催化剂相比,Fe ox / D3表现出优异的活性。铁/ D3表现出与Ag / D3相当的活性,而Ag / D3是此反应有史以来活性最高的催化剂之一。另外,Fe ox / D3比类似的Cu / D3具有更高的稳定性和可回收性。使用Fe ox / D3作为光催化剂,可以达到38,000的最小累积周转数。可以在需氧生物处理之前实施使用苯酚作为模型污染物,Fe ox / D3作为催化剂的异质photoFenton工艺,该工艺在需氧生物处理之前会产生可生物降解的流出物,而该流出物缺乏生态毒性,这是通过测量生物需氧量来确定的。瞬态吸收光谱法提供了证据支持Fe ox辐射形成/ D3归因于电子和空穴的光生电荷分离状态。电子顺磁共振和选择性猝灭实验表明,羟基是Fe ox / D3促进的光助Fenton反应中产生的主要活性氧。

更新日期:2017-12-25
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