Method for preparing zinc ferrite from waste batteries and application of zinc ferrite in degradation of bisphenol A

A zinc ferrite, waste technology, applied in the field of photocatalyst material preparation, can solve the problems of catalyst structure change, secondary pollution of water, increase treatment cost, etc., and achieve the effects of good crystallinity, easy separation, and improved service life

Active Publication Date: 2020-04-03
WUHAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the high metal dissolution rate is often a major drawback in the practical application of catalysts containing metal components. The precipitated metal components will, on the one hand, cause structural changes in the catalyst and cause it to lose its original form; on the other hand, heavy metals in the free state It will cause secondary pollution to the water body and increase the treatment cost

Method used

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  • Method for preparing zinc ferrite from waste batteries and application of zinc ferrite in degradation of bisphenol A
  • Method for preparing zinc ferrite from waste batteries and application of zinc ferrite in degradation of bisphenol A
  • Method for preparing zinc ferrite from waste batteries and application of zinc ferrite in degradation of bisphenol A

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Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing zinc ferrite by utilizing waste alkaline zinc-manganese batteries, specifically comprising the following steps:

[0032] (1) Dismantling the waste alkaline zinc-manganese battery to obtain the steel shell of the battery outer layer and the battery cathode zinc paste;

[0033] (2) Dissolve the steel shell and zinc paste in step (1) separately, the solution is 3mol / L sulfuric acid, heat and reflux in a water bath at 80°C for 1 hour, and the solid-to-liquid ratio of the steel shell and sulfuric acid is 1:20 , the solid-to-liquid ratio of zinc paste to sulfuric acid is 1:10;

[0034] (3) the lysate of step (2) is suction-filtered while hot to obtain iron-containing filtrate and zinc-containing filtrate, and respectively measure zinc and iron ion contents in the solution;

[0035] (4) get step (3) gained iron-containing filtrate and zinc-containing filtrate to mix, and add monohydrate citric acid to dissolve and mix, wherein the mol ratio of elemental...

Embodiment 1

[0043] The application of the photocatalyst zinc ferrite prepared in embodiment 1 in the treatment of organic wastewater endocrine disruptor bisphenol A (BPA), the specific steps are as follows:

[0044] Put 100mL of simulated wastewater containing BPA (the initial concentration of BPA is 0.1mmol / L) in the photocatalytic reactor, add sodium persulfate (0.5mmol) and zinc ferrite (0.05g), and continuously feed the reactor with circulating cooling Water, react under light conditions (the wavelength of the light source is not less than 400nm) for 120 minutes. During the reaction period, the system was sampled and the content of BPA was determined, and its changes were recorded.

[0045] figure 2 It is the effect diagram of the oxidative degradation of BPA by zinc ferrite in the photoactivated persulfate system in this example. Depend on figure 2 It can be seen that the zinc ferrite photocatalyst activates the persulfate system under visible light conditions, and the degradati...

Embodiment 3

[0047] The application of the photocatalyst zinc ferrite prepared in embodiment 1 in the treatment of organic wastewater endocrine disruptor bisphenol A (BPA), the specific steps are as follows:

[0048] 100mL of simulated wastewater containing BPA (the initial concentration of BPA is 0.1mmol / L) was placed in the photocatalytic reactor, sodium persulfate (0.1mmol) and zinc ferrite (0.03g) were added, and the reactor was continuously fed with circulating cooling Water, react under light conditions (Xe light source wavelength not less than 400nm) for 120 minutes. During the reaction period, the system was sampled and the content of BPA was determined, and its changes were recorded.

[0049] After the reaction, the solution in the reactor was filtered with suction, and the filter cake was retained and cleaned, dried overnight in an oven at 70°C, collected and stored, and used as a photocatalyst in the second repeated experiment. The catalyst used in the third repeated experiment w...

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Abstract

The invention relates to a method for preparing zinc ferrite from waste batteries and application of the zinc ferrite in the degradation of bisphenol A. The preparation method comprises the followingsteps of adding acid to dissolve an outer steel shell and cathode zinc paste of a waste alkaline zinc-manganese battery under heating reflux to obtain an iron-containing filtrate and a zinc-containingfiltrate, dissolving and mixing the iron-containing filtrate and the zinc-containing filtrate with citric acid monohydrate, adding alkali to adjust the pH value of the mixed solution to 2.9-3.1, andcarrying out a reaction in three steps: firstly, stirring and reacting at room temperature for 3.5-4.5 hours; secondly, stirring and reacting for 1.5 to 2.5 hours at the temperature of 55 to 65 DEG C;and finally, stirring at the temperature of 85-95 DEG C for 1-3 hours to obtain a gelatinous solid, drying, grinding, calcining, washing with water to be neutral, and drying to obtain the zinc ferrite. According to the method, the waste alkaline zinc-manganese battery is used as a raw material, exogenous metal elements do not need to be supplemented, and the prepared zinc ferrite is good in crystallinity, stable in structure, high in catalytic activity, low in metal ion dissolution rate, recyclable, simple in process, easy in raw material obtainment, convenient to operate and low in cost.

Description

technical field [0001] The invention belongs to the field of photocatalyst material preparation, and in particular relates to a method for preparing zinc ferrite by using waste batteries and its application in degrading bisphenol A. Background technique [0002] Common photocatalytic technologies are mainly divided into ultraviolet (UV) catalysis and visible light catalysis according to the type of input light source. In the solar spectrum, visible light (380-700nm) accounts for about 52% of all solar radiation (150-4000nm), while ultraviolet light only accounts for about 5%, making more and more scholars turn their attention to visible light, and Research on efficient and durable photocatalytic materials is the core issue in photocatalytic technology. Zinc ferrite (ZnFe 2 o 4 ) has a narrow band gap (about 1.9eV), and is an n-type semiconductor photocatalyst with high photocatalytic activity and sensitivity to visible light. It can be excited by light with a wavelength b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B01J23/80C02F1/30C02F1/72C02F101/30C02F101/34
CPCB01J23/80B01J35/004C01G49/00C02F1/30C02F1/725C02F2101/305C02F2101/345C02F2305/10
Inventor 林恒李瑞梦张立通周思芮刘星宇马燕燕胡瀚文张晖
Owner WUHAN UNIV
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