Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China.
Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School Chemistry and Chemical Engineering, Yulin University, Yulin, 71900, Shannxi, China.
Environ Sci Pollut Res Int. 2022 Oct;29(49):74163-74172. doi: 10.1007/s11356-022-21002-6. Epub 2022 May 28.
Semi-coking wastewater contains a rich source of toxic and refractory compounds. Three-dimensional electro-Fenton (3D/EF) process used CuFeO as heterocatalyst and activated carbon (AC) as particle electrode was constructed for degrading semi-coking wastewater greenly and efficiently. CuFeO nanoparticles were prepared by coprecipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy disperse spectroscopy (EDS). Factors like dosage of CuFeO, applied voltage, dosage of AC and pH, which effect COD removal rate of semi-coking waste water were studied. The results showed that COD removal rate reached to 80.9% by 3D/EF process at the optimum condition: 4 V, 0.3 g of CuFeO, 1 g of AC and pH = 3. Trapping experiment suggesting that hydroxyl radical (•OH) is the main active radical. The surface composition and chemical states of the fresh and used CuFeO were analyzed by XPS indicating that Fe, Cu, and O species are involved into the 3D/EF process. Additionally, anode oxidation and the adsorption and catalysis of AC are also contributed to the bleaching of semi-coking waste water. The possible mechanisms of 3D/EF for degrading semi-coking waste water by CuFeO heterocatalyst were proposed.
半焦废水含有丰富的有毒和难处理的化合物。为了绿色高效地降解半焦废水，构建了以 CuFeO 为异相催化剂、活性炭（AC）为颗粒电极的三维电芬顿（3D/EF）工艺。采用共沉淀法制备了 CuFeO 纳米粒子，并通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）和能谱（EDS）进行了表征。研究了 CuFeO 用量、施加电压、AC 用量和 pH 等因素对半焦废水 COD 去除率的影响。结果表明，在最优条件下（4 V、0.3 g CuFeO、1 g AC 和 pH=3），3D/EF 工艺对 COD 的去除率达到 80.9%。捕获实验表明，羟基自由基（•OH）是主要的活性自由基。通过 XPS 分析了新鲜和使用后的 CuFeO 的表面组成和化学状态，表明 Fe、Cu 和 O 物种参与了 3D/EF 过程。此外，阳极氧化和 AC 的吸附和催化作用也对半焦废水的脱色有贡献。提出了 CuFeO 异相催化剂用于 3D/EF 降解半焦废水的可能机制。
