A treatment method for improving the reusable performance of modified polytetrafluoroethylene fiber iron complex catalyst

Abstract

The invention relates to a treatment method for improving reusability of a modified polytetrafluoroethylene fibre iron complex catalyst. The treatment method comprises the following four steps: pretreatment, preparation of reuse treating liquid, reuse treatment and post-treatment, wherein the reuse treating liquid is a water solution prepared from ferric sulfate, oxalic acid and hydrogen peroxide; the molar concentration of the ferric sulfate is 1.0*10<-4> mol / L; the molar concentration of the oxalic acid is 2-12.0*10<-4> mol / L; the molar concentration of the hydrogen peroxide is 4.0*10<-3> mol / L. The catalytic activity and the reusability of the modified polytetrafluoroethylene fibre iron complex catalyst processed by the method are significantly improved; the physical mechanical strength and inoxidizability are not reduced. Especially, the treatment effect is better when the molar concentration of the ferric sulfate to the oxalic acid in the reuse treating liquid is 1:6. The treatment method is carried out in a visible light, an ultraviolet light or a sunlight, so that the treatment can be faster, and the treatment effect is improved. The treatment method disclosed by the invention has the characteristics of being short in treatment time, low in cost, simple to operate, good in adaptability and the like.

Description

technical field [0001] The invention relates to a chemical catalyst regeneration technology, in particular to a treatment method for improving the reusability of a modified polytetrafluoroethylene fiber iron complex catalyst when degrading organic pollutants such as dyes in printing and dyeing wastewater. Background technique [0002] Fenton oxidation technology is an effective method for removing persistent organic pollutants such as dyes from wastewater, which can rapidly and completely degrade and mineralize these pollutants. The heterogeneous Fenton reaction catalyst made by immobilizing iron ions on the surface of the supporting material can not only significantly promote their degradation reaction, but also has the advantages of strong pH applicability and easy recovery, so the development of heterogeneous Fenton catalyst is The current key to improving Fenton oxidation technology. Fiber metal complexes have attracted people's attention as heterogeneous Fenton photoca...

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Problems solved by technology

However, with the increase in the number of times the catalyst is used, some active centers on the surface may lose their activity due to the adsorption of dye molecules or their degradation intermediates, and no longer support H 2 o 2 Has a catalytic decomposition effect, resulting in H in the reaction system when the catalyst is reused again 2 o 2 The decomposition rate decreases, the amount of OH produced decreases, and the dye decolorization rate will decrease significantly, and even the catalyst can hardly be used and needs to be regenerated or replaced. Therefore, the catalytic stability of the catalyst and its regeneration technology are particularly important.

In the past, we usually used a 1:1 mixed solution of water and ethanol to treat the used catalyst. Although its catalytic performance has recovered, it still cannot meet the actual requirements of repeated reuse [see Dong Yongchun et al. Preparation of permanent PTFE fiber metal complexes and their photocatalytic degradation properties, Acta Physicochemical Sinica, 2013, 29(01): 157-166]

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