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Preparation method and application of sepiolite composite adsorbent loaded with nano zinc sulfide

A technology of nano-zinc sulfide and composite adsorption, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of high activity, insufficient adsorption capacity, instability, etc., and achieve simple modification process, The effect of wide source of raw materials and wide promotion and application value

Inactive Publication Date: 2020-07-14
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified sepiolite prepared above is mainly metal or organically modified sepiolite, the cost is relatively high and not necessarily suitable for heavy metal adsorption, and there are also literature reports that loading nano-hydroxyapatite on sepiolite improves the Cd 2+ The adsorption capacity (Han et al., 2019), but the adsorption capacity is still insufficient
In addition, the sulfur-containing compound nano-zinc sulfide (ZnS) has been reported to be able to efficiently remove heavy metals in wastewater, but because of its large specific surface area, its activity is high, it is extremely unstable, and it is prone to agglomeration and loses its original properties. Many active sites for removing heavy metal ions, reducing the use value of the material

Method used

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  • Preparation method and application of sepiolite composite adsorbent loaded with nano zinc sulfide
  • Preparation method and application of sepiolite composite adsorbent loaded with nano zinc sulfide
  • Preparation method and application of sepiolite composite adsorbent loaded with nano zinc sulfide

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Experimental program
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Effect test

Embodiment 1

[0032] A method for preparing a nano zinc sulfide sepiolite composite adsorbent, comprising the following steps:

[0033] (1) Mix sepiolite with 1mol / L hydrochloric acid solution according to the solid-to-liquid ratio of 1:20, stir magnetically at 400rpm for 16 hours, rinse with deionized water, and centrifuge until the pH is close to 7, and then filter and place in a refrigerator at 105°C Dried in an oven for 2 hours, and ground through a 100-mesh sieve to obtain acid-modified sepiolite;

[0034] (2) Put the acid-modified sepiolite obtained in step (1) into a muffle furnace for high-temperature roasting, heat up at a rate of 5°C / min, reach the roasting temperature, and continue for 2 hours, and cool to room temperature after the roasting is completed. Obtain acid heat modified sepiolite;

[0035] (3) The acid-heat modified sepiolite obtained in step (2) and the loaded ZnS are mixed in ZnSO with a mass ratio of 1:10 4 After soaking in the solution for 30min, drop Na 2 The S...

Embodiment 2

[0038] Other conditions are the same as in Example 1, except that in step (3), the mass ratio of the acid-heat modified sepiolite to the loaded ZnS is 1:5, and other conditions and test conditions are the same as in 1, and the sample is to Cd 2+ The adsorption capacity is 101.40mg / g. Compared with Example 1, it is poor.

Embodiment 3

[0040] Other conditions are the same as in Example 1, except that in step (3), the mass ratio of the acid-heat modified sepiolite to the loaded ZnS is 1:2, and other conditions and test conditions are the same as in 1, and the sample is to Cd 2+ The adsorption capacity is 144.77mg / g. Compared with Example 1, it is poor.

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Abstract

The invention relates to a preparation method and application of a sepiolite composite adsorbent loaded with nano zinc sulfide, and belongs to the technical field of environmental protection. The preparation method comprises acid heat treatment of purified sepiolite and zinc sulfide modification of sepiolite subjected to acid heat treatment, i.e., sepiolite is pretreated through acid heat modification, and then nanoscale zinc sulfide is loaded through coprecipitation, so that the efficient heavy metal cadmium composite adsorbent is prepared. The adsorbent obtained by the invention combines theadvantages of high adsorption capacity of nano zinc sulfide and rich pore structure of sepiolite, and cadmium ions in a water body are efficiently removed mainly by generating a solid solution ZnxCd1-xS (x (1). The preparation method disclosed by the invention is simple, low in production cost, high in removal rate of cadmium in wastewater and low in desorption rate, can be used as an adsorbent or a passivator for heavy metal cadmium in water and soil, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method and application of a nano zinc sulfide-loaded sepiolite composite adsorbent. Background technique [0002] With the development of my country's industry, the cadmium present in industrial waste gas from the preparation of photosensitive elements, paints and coatings, pigments, corrosion-resistant steel plates, etc. will diffuse to the surrounding factories with the wind, and enter the soil after rainfall, mining smelters, nickel-cadmium battery factories Cadmium is contained in the industrial waste water produced in the production process of factories, nuclear factories, etc. If it is not treated or the treatment is not up to standard, the cadmium contained in the sewage will enter the soil in the form of sewage irrigation, and finally enter the human body through the food chain. The heavy metal cadmium is one of the most toxic hea...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/32C02F1/28C02F101/20
CPCB01J20/0244B01J20/12B01J20/3204C02F1/281C02F2101/20
Inventor 张美一孔彦姣王东升
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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