水热法合成纳米Fe_3O_4及其对含酚废水的处理

PREPARATION OF NANO-SIZED MAGNETITE PARTICLES BY HYDROTHERMAL METHOD FOR TREATMENT OF PHENOLIC WASTEWATER

通过水热法制备了纳米四氧化三铁,采用X射线衍射仪、透射电子显微镜对其进行了表征。以合成的纳米四氧化三铁为催化剂,过氧化氢为氧化剂,催化氧化含邻苯二酚的模拟废水和含邻甲苯酚的工业废水。结果表明:含邻苯二酚模拟废水和含邻甲苯酚的工业废水的挥发酚去除率分别为99.9%和99.3%,化学需氧量下降率分别为87.5%和95.4%。纳米四氧化三铁作为催化剂多次循环使用后仍具有较高的催化活性。通过亚甲基蓝捕捉法,检测了催化氧化反应中羟基自由基的产生并确定了H2O2的投料方式,探讨了邻苯二酚模拟的催化氧化降解途径。

ed particles of magnetite （Fe3O4） was prepared by a hydrothermal method.The samples obtained were characterized by X-ray powder diffractometer and transmission electron microscope.The nano-sized particles of Fe3O4 were used as catalysts for degradation of the catechol simulated wastewater and o-cresol industrial wastewater with hydrogen peroxide in the oxidation.The results show that the removal rates of volatile phenol in the simulated and industrial wastewater are 99.9% and 99.3%,and the reduction rates of chemical oxygen demand are 87.5% and 95.4%,respectively.The nano-sized Fe3O4 catalysts after used for several times and recycled still remained a high activity.The hydroxyl radicals in the catalytic oxidation reaction were detected by a methylene blue catching method and the addition way of H2O2 was investigated.The approach of the catalytic oxidation of simulated waste water containing catechol was also discussed.