聚铁硅盐掺杂羟基氧化铁类芬顿催化氧化苯酚

为解决非均相类芬顿法催化剂分离回收困难的问题，采用共沉淀法制备了催化剂聚铁硅盐掺杂羟基氧化铁(PFSC-FeOOH)。利用X射线衍射(XRD)、扫描电子显微镜(SEM)以及傅里叶变换红外光谱(FT-IR)等技术手段对催化剂进行了表征。以苯酚为目标污染物，分别考察了催化剂用量、H₂O₂用量、反应温度、苯酚初始浓度和pH对PFSC-FeOOH催化H₂O₂去除苯酚效果的影响，探究了可能的反应机理。结果表明：在反应时间为40 min、pH=4、H₂O₂投加量为297 mmol·L⁻¹、催化剂PFSC-FeOOH投加量为3 g·L⁻¹、反应温度为室温((25±1) ℃)的条件下，苯酚降解率为90.48%；反应符合准一级反应动力学，速率常数为 0.0415 min⁻¹；反应过程中羟基自由基(·OH)起主要作用，苯酚的分子结构被氧化破坏；反应后，催化剂易于沉降分离，沉降速度为0.1 m·min⁻¹。以上研究结果可为实际有机废水的处理提供参考。

Fenton-like catalytic oxidation of phenol by polysilicate ferric doped iron oxyhydroxides

To solve the problem of difficulty in the separation and recycle of heterogeneous Fenton-like catalyst, polysilicate ferric doped iron oxyhydroxides (PFSC-FeOOH) was prepared by the co-precipitation method. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FT-IR). Using phenol as the target pollutant, the effects of PFSC-FeOOH and H2O2 dosages, temperature, the initial concentration of phenol solution and pH on phenol removal by Fenton-like oxidation with PFSC-FeOOH catalyzing H2O2 were investigated, and the reaction mechanism was explored. The results showed that the phenol degradation efficiency was 90.48% at the reaction time of 40 min, pH of 3, the H2O2 dosage of 297 mmol·L−1, the catalyst PFSC-FeOOH dosage of 3 g·L−1 and room temperature ((25±1) ℃). The reaction process conforms to the Quasi-first order reaction, and the rate constant was 0.0415 min−1. The hydroxyl radical (·OH) played a major role in the reaction process, and the molecular structure of phenol was destroyed. After reaction, the catalytic was settled and separated easily with the sedimentation speed of 0.1 m·min−1. The Fenton-like oxidation with PFSC-FeOOH as catalyst can effectively treat phenol wastewater which provides some references for degradation of organic wastewater.