The stability and toxicity of quinolines are difficult to degrade by conventional physicochemical and biological methods, posing a threat to human health and the environment. In this study, we prepared NiCo2S4/g-C3N4 particles and applied them in an electrochemical reactor to form a three-dimensional catalytic particle electro-Fenton system (3D-EF), which can efficiently remove quinoline from wastewater. The NiCo2S4/g-C3N4 catalytic particles were characterized by XRD, SEM, TEM, XPS. The optimum conditions for 3D-EF were 30 min reaction time, 60 g/L NiCo2S4/g-C3N4 particles dosage, pH value of 3, 67.6 mmol/L H2O2 concentration, 12.1 ms/cm conductivity and 5 A current. Under the optimum conditions, a chemical oxygen demand (COD) removal rate of 95.6% was achieved. NiCo2S4/g-C3N4 catalytic particles can be easily recovered by filtration and can be reused. Kinetic analysis showed that the COD degradation of quinoline solutions by the 3D-EF followed a first-order kinetic model. To determine the important role of hydroxyl radicals in the electrochemical process, electron paramagnetic reaction (EPR) and radical scavenging experiments were performed. Finally, in order to elucidate the degradation mechanism, the intermediates were identified by high performance liquid chromatography-mass spectrometry (HPLC-MS) and two possible degradation pathways were proposed. Meanwhile, the biochemical analysis of quinoline wastewater was also performed.

With high toxicity, carcinogenicity and teratogenicity, quinoline has been threatening human health and ecological environment. Herein, Fe-Co-Ni-P/g-C3N4 particles are developed as electrochemical reactors to form a three-dimensional catalytic particle electrode system (3D-CPE) for efficient removal of quinoline from wastewater by electro-Fenton (EF) oxidation process. with reaction time of 30 min, the particles dosage of 50 g/L, pH of 3, conductivity of 11.5 ms/cm, and current density of 37.04 mA/cm2, the chemical oxygen demand (COD) removal rate can up to 90.95%. In addition, electron paramagnetic response (EPR) and radical scavenging tests are performed to determine the hydroxyl radicals of electrochemical processes produced. The degradation products are analyzed by high performance liquid chromatography-mass spectrometry (HPLC-MS). Finally, through theoretical calculation and analysis of degradation products, a reasonable degradation mechanism is proposed.

Wastewater containing quinoline has become a common pollutant in water and soil environments, which poses a threat to human health due to its carcinogenicity, teratogenicity, and mutagenicity. Quinoline’s stability and toxicity hinders its degradation by conventional physicochemical and biological methods. In this contribution, Fe-Co-Bi/kaolin particle electrodes were prepared for the efficient degradation of quinoline in wastewater, and characterized by using scanning electron microscope, X-ray diffraction, pyridine-IR, Brunauer–Emmett–Teller, X-ray photoelectron spectroscopy, and four-probe resistivity test. Parameters affecting the degradation efficiency were optimized to be the particle electrode dosage of 40 g/L, pH 3.5, H2O2 addition of 67.6 mmol/L, electrical conductivity of 12.7 ms/cm, and voltage of 20 V. The constructed three-dimensional catalytic particle electrode system (3D-CPE) achieved 92.1

采用电-Fenton法处理化学需氧量(CODCr)质量浓度为7378 mg/L的脱水蔬菜废水,考察施加电压、电流密度、电导率、H2O2添加浓度、pH值、处理时间等因素对废水CODCr去除率的影响,探讨了污染物的降解规律及废水经处理后的可生化性.结果表明:在外加电压为16 V,电流密度为10.2 mA/cm2,电导率为23000μs/cm,H2O2浓度为32 mmol/L,pH值为3的条件下,反应20 min,原废水COD Cr可降至1771 mg/L,去除率达76％.五日生化需氧量(BOD5)由1992 mg/L下降至845 mg/L,BOD5/CODCr比由0.27增至0.48,废水可生化性明显改善,进一步为生化处理废水创造了良好的条件.