Sulfur modified porous iron oxide catalyst, preparation method therefor and application of sulfur modified porous iron oxide catalyst

Abstract

The invention belongs to the field of environmental pollution remediation and inorganic materials and particularly relates to a sulfur modified porous iron oxide catalyst, a preparation method therefor and application of the sulfur modified porous iron oxide catalyst. A main ingredient of the porous iron oxide catalyst is iron oxide, and a sulfide of iron coexists. The preparation method comprises the steps: dissolving oxalic acid in water so as to prepare an oxalic acid solution, carrying out heating in water bath, and carrying out stirring while carrying out heating until the oxalic acid is completely dissolved; and adding a sulfur compound solution into the oxalic acid solution, carrying out uniform mixing, then, dropwise adding a ferrous salt solution into the mixture, continuing to carry out stirring until the reaction is thorough, then, carrying out ice bath immediately so as to obtain a yellow suspension, carrying out filtrating, then, carrying out drying treatment so as to obtain a yellow sulfur-modified ferrous oxalate precursor, and then, carrying out calcination, thereby obtaining the sulfur modified porous iron oxide catalyst. The sulfur modified porous iron oxide catalyst can be used for effectively activating hydrogen peroxide and persulfate in sewage water with the pH value of 3-10 and efficiently removing toxic or refractory organic pollutants from the water.

Description

technical field [0001] The invention belongs to the field of environmental pollution remediation and inorganic materials, and particularly relates to a sulfur-modified porous iron oxide catalyst and a preparation method and application thereof. Background technique [0002] my country is a big water-deficient country, and environmental pollution, especially water pollution, will further reduce the available water resources and restrict my country's economic and social development. Common sewage treatment methods include physical method, chemical method and microbial method. Physical methods can only achieve the transfer of pollutants, but cannot eliminate their environmental hazards. Biological method is the most common sewage treatment method, but its treatment cycle is long, and the treatment effect of industrial wastewater containing a large amount of highly toxic and refractory organic pollutants is not good. The advanced oxidation technology based on hydroxyl radicals...

AI Technical Summary

Problems solved by technology

[0008] ① Narrow pH operating range: Fenton reagent has a better treatment effect in the range of pH 2.0 to 6.0, and the best activity is reflected at pH 2.8; at higher pH, such as when pH is greater than 6.0, Fenton reagent The effect of Fe is greatly reduced due to iron accumulation and precipitation, and in the presence of oxygen, Fe 2+ will be oxidized to Fe 3+ , thus forming iron oxides to settle down and lose their catalytic effect; since the pH of most wastewater is greater than 6.0, it is necessary to pre-adjust the acidity of the wastewater and add acidic reagents, thus increasing the operating cost;

[0010] ② Fenton cannot completely mineralize organic matter. In most cases, due to the tendency of iron aggregation and sedimentation, the intermediate products of degradation can be combined with Fe 3+ It forms a stable complex and can compete with the generation of OH. It is difficult to use Fenton's reagent to degrade organic pollutants. The mineralization degree is difficult to exceed 60%.

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