绿色合成纳米铁类芬顿氧化处理水中苯酚

采用石榴叶提取液合成纳米铁作为低成本类芬顿氧化的催化剂,加入过氧化氢形成类芬顿氧化系统对溶液中苯酚进行降解,探讨了温度、pH、纳米铁用量、H_2O_2含量对苯酚降解的影响。结果表明,纳米铁吸附对苯酚去除率达到63%,类芬顿氧化对苯酚去除率提高到86%。在纳米铁的用量100 m L、温度323 K、H_2O_2浓度为10 mmol/L、pH为3的优化条件下,苯酚去除率达到86%。红外光谱、扫描电子显微镜表征征实,降解后的纳米铁表面发生明显的团聚现象,多酚等有机物、Fe_2O_3和Fe_3O_4参与了苯酚的降解;动力学分析可推断,苯酚被吸附到氧化铁(氢氧化铁)表面上,与类芬顿试剂H_2O_2反应产生带有强氧化性的羟基自由基将苯酚氧化降解。

Fenton-like Oxidation of Phenol in Water by Green Synthetic Iron Nanoparticles

Fe-NPs was synthesized from pomegranate leaf extract as a low-cost Fenton oxidation catalyst, and H2O2 was added to form a Fenton-like oxidation system to degrade phenol in solution. The effects of temperature, pH, Fe-NPs dosage and content on phenol degradation were investigated. The results showed that the removal rate of phenol by Fe-NPs adsorption reached 63%, and the removal rate of phenol by Fenton-like oxidation increased to 86%. The removal efficiency of phenol reached 86% when the dosage of Fe-NPs was 100 mL, the reaction temperature was 323 K, the concentration of H2O2 was 10 mmol/L, and the initial pH was 3. SEM and FTIR showed that agglomeration occured on the surface of iron nanoparticles after degradation,polyphenols, Fe2O3 and Fe3O4 were all involved in the degradation of phenol. In addition, the kinetic analysis of adsorption and oxidative degradation in the whole process were conducted to further confirm the adsorption and oxidation performance of Fe-NPs Fenton-like oxidation.