Insight into bicarbonate involved efficient heterogeneous Fenton-like degradation of sulfamethoxazole over a CuFeO2 based composite under alkaline conditions,Environmental Science: Nano

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Insight into bicarbonate involved efficient heterogeneous Fenton-like degradation of sulfamethoxazole over a CuFeO2 based composite under alkaline conditions
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-4-6 , DOI: 10.1039/d1en00055a
Chu Dai _{1,

2,

3,

4} , Xike Tian _{1,

2,

3,

4} , Shuxuan Feng _{1,

2,

3,

4} , Yulun Nie _{1,

2,

3,

4} , Yong Li _{1,

2,

3,

4} , Liqiang Lu _{1,

2,

3,

4}

Affiliation

The performance of the Fenton reaction under alkaline conditions is important to promote its application in practical water treatment. In this study, a sulfide doped mesoporous carbon (SC) and CuFeO₂ composite (SC@CuFeO₂) was prepared and its Fenton-like activity was evaluated by the degradation of sulfamethoxazole (SMX) in an alkaline solution especially in the presence of bicarbonate. The results indicated that 93% of SMX was efficiently degraded over SC@CuFeO₂ at pH 8.7 with 15 mM HCO₃⁻ in water. In comparison, the SMX removal efficiency was only about 20% without HCO₃⁻. Furthermore, the introduction of SC can indeed improve the Fenton activity of CuFeO₂. For instance, the removal efficiency of SMX over CuFeO₂ and SC@CuFeO₂ was 80% and 70%, respectively, under the same conditions. Based on the characterization results, electron paramagnetic resonance spectra, probe experiments and ˙OH radicals' quantitative measurement, more radical production especially the transformation processes involving reactive oxygen species (˙OH, O₂˙⁻ CO₃˙⁻ and ¹O₂) were responsible for the enhanced SMX degradation over SC@CuFeO₂ under alkaline conditions. Finally, the intermediates of SMX degradation were detected by GC-MS/MS and the degradation pathway was discussed. These findings suggest that the effect of the water matrix on the oxidation efficiency of the Fenton reaction should be considered in real water treatment.

中文翻译：

对碳酸氢盐的研究涉及碱性条件下在基于CuFeO2的复合材料上磺胺甲恶唑的高效异质芬顿状降解

Fenton反应在碱性条件下的性能对于促进其在实际水处理中的应用很重要。在这项研究中，制备了硫化物掺杂的中孔碳（SC）和CuFeO ₂复合材料（SC @ CuFeO ₂），并通过在碱性溶液中特别是在碳酸氢盐存在下降解磺胺甲恶唑（SMX）来评估其Fenton样活性。。结果表明，SMX的93％被有效降解超过SC @ CuFeO ₂在与15mM的pH值HCO 8.7 ₃^-水。相比较而言，SMX去除效率仅为约20％，而不HCO ₃^-。此外，SC的引入确实可以改善CuFeO ₂的Fenton活性。。例如，在相同条件下，SMX在CuFeO ₂和SC @ CuFeO _2上的去除效率分别为80％和70％。基于所述表征结果，电子顺磁共振光谱，探针实验和OH自由基定量测量，更激进的生产尤其涉及反应性氧物质的转化过程（OH，O- ₂ ˙ ^- CO ₃ ˙ ^-和¹ ö ₂）为导致SC @ CuFeO _2上增强的SMX降解在碱性条件下。最后，通过GC-MS / MS检测了SMX降解的中间体，并讨论了降解途径。这些发现表明，在实际的水处理中应考虑水基质对Fenton反应的氧化效率的影响。

更新日期：2021-04-22

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