Magnetic ferroferric oxide/graphene oxide nano composite Fenton-like catalytic material, and preparation and application thereof

Abstract

The invention discloses a magnetic ferroferric oxide / graphene oxide nano composite Fenton-like catalytic material, and a preparation and application thereof. The magnetic ferroferric oxide / graphene oxide nano composite Fenton-like catalytic material contains Fe3O4 with a structure of nano hollow spheres and contains graphene oxide which coats the surfaces of the hollow spheres and has a structureof a pleated thin film. The preparation method comprises the following steps: firstly, preparing graphene oxide GO by using an improved Hummers method; and secondly, preparing the ferroferric oxide / graphene oxide FGO nano composite Fenton-like catalytic material by using a hydrothermal method. The material has the advantages of capability of being magnetically recycled, mild reaction conditions, wide pH application range and good treatment effect.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, relates to a magnetic ferric oxide / graphene oxide nanocomposite Fenton-like catalytic material and its preparation and application, and also relates to ferric oxide / graphene oxide in heterogeneous Fenton-like photocatalysis Application in the treatment of papermaking wastewater. Background technique [0002] The modern pulp and paper industry is a high-energy industry that requires a lot of water, which produces a lot of polluted wastewater, which will have a bad impact on the cycle of the natural environment and the life activities of organisms. Due to the complex composition of papermaking wastewater, mainly high content of COD and suspended solids, serious chroma, large wastewater content, and poor biodegradability, it is a difficult industrial wastewater to treat. Since the chlorine bleaching process still occupies the main part in my country's pulp and paper industry, the adsorbable orga...

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Problems solved by technology

However, photocatalytic technology also has deficiencies, such as the most deeply studied semiconductor photocatalytic material TiO 2 Due to its wide band gap energy, it can only absorb light in the ultraviolet region, which is the limiting factor for its application. In addition, some new heterogeneous photocatalysts with narrow band gap energy and photoresponse characteristics, due to the use of transition metal oxides as powders It is difficult to achieve solid-liquid separation when the material is used, resulting in secondary pollution

Another refractory organic wastewater treatment technology with the most industrial application prospects - Fenton oxidation technology can quickly degrade and mineralize organic pollutants, and has a wide range of applications and strong anti-interference ability. At the same time, the reaction system utilizes H 2 o 2 as an oxidizing agent, since its eventual decomposition produces H 2 O and O 2 , green and environmentally friendly, non-toxic to the environment, but its disadvantages need to be carried out under strong acidic conditions, a large amount of acid needs to be added to the reaction system to reduce the pH value of the wastewater before the reaction, and a large amount of alkali is required after the reaction is completed Adjusting the pH value to neutral is time-consuming and labor-intensive, but also significantly increases the cost of wastewater treatment

In addition, the iron salt catalyst added to the reaction system is easy to form iron sludge that is difficult to dispose of after the reaction, which not only wastes resources, but also causes secondary pollution to the environment

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