【作者】 刘忠煌；

【导师】 柴多里；

【作者基本信息】 合肥工业大学 ， 生物化工， 2010， 硕士

【摘要】 酚类化合物是一种重要的化工原料,但是含酚废水不仅对人们的日常生活造成严重的影响,危害人体的健康,而且严重破坏自然生态平衡,造成严重的环境污染。因此,含酚废水的污染防治研究工作已成为保护环境和造福人类的重要任务。本文拟采用自行制备的纳米四氧化三铁作为催化剂,过氧化氢为氧化剂,催化氧化处理含酚废水。该类Fenton试剂处理含酚废水方法的优点在于:催化剂不仅容易分离、回收并加以循环使用,而且没有催化剂的二次污染;在含酚废水处理前无需调节pH的情况下,该方法能有效降低废水中的挥发酚和CODCr值。主要研究内容为:(1)采用共沉淀法、水热共沉淀法制备纳米四氧化三铁,并通过XRD、TEM和FT-IR进行了相应的表征,并将水热共沉淀法制备的纳米四氧化三铁用于含酚废水的处理。(2)通过单因素实验,以处理后废水的含酚量为考察指标,考察工艺条件的变化对含酚废水处理效果的影响;在优化的工艺条件下,催化剂经多次循环使用后的催化性能进行了研究。(3)制备的纳米四氧化三铁在处理模拟的二酚废水以及萘酚废水有着良好的催化性能,废水中的挥发酚和CODCr的降解率均较高,并通过MB捕捉法检测到了反应过程中羟基自由基的变化情况,对催化氧化降解含酚废水可能的降解机理进行了探讨。更多还原

【Abstract】 Phenolic compounds are important chemical material, it is not only cause serious effect on our daily life and harm for the human health, but also seriously damage the natural ecological balance to cause serious environmental pollution. Therefore, it is an unshirkable responsibility to protect the environment and benefit the human beings under the scientific research of the phenolic wastewater. In this thesis, the nano-sized particles of Fe3O4 were used as catalysts for degradation of the phenolic compounds and hydrogen peroxide was used as oxidation with self-prepared production. The advantages of this Fenton-like reagent have showed that catalyst is not only easy to be separated and recovered, feasible to be used repeatedly, but also has no secondary pollution to the environment. Before the treatment of the phenolic wastewater when pH was not needed adjusting, the method can make volatile phenol and CODCr in wastewater effectively reduced. The study process and results are as follows:(1) The nano-Fe3O4 was synthesized by coprecipitation and hydrothermal- coprecipitation and was characterized by X-ray diffraction (XRD)、transmission electron microscope (TEM) and Fourier infrared ray (FT-IR). The nano-Fe3O4 could be used as catalysts for treatment of the phenolic wastewater by hydrothermal- coprecipitation.(2) The singe factor experiment was used to investigate the effects of treatment of process conditions with treated wastewater containing phenol content as the indexes. Catalyst was recycled several times and then the catalytic properties were studied under the optimized process conditions.(3) Preparation of nano-Fe3O4 had a good catalytic performance in the treatment of phenol and naphthol simulated wastewater. The removol rate of phenol and CODCr in simulated wastewater was high. The hydroxyl radical was captured by MB to detect its changes in the reaction process, and the possible mechanism was discussed in catalytic degradation of phenol wastewater.更多还原