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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AI-Extracted 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, t...
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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.

Application Domain

Other chemical processesWater contaminants +1

Technology Topic

Pre treatmentCadmium ion +6

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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

Examples

  • Experimental program(7)

Example Embodiment

[0031] Example 1
[0032] A preparation method of nano-zinc sulfide sepiolite composite adsorbent, comprising the following steps:
[0033] (1) Mix sepiolite with 1 mol/L hydrochloric acid solution according to the ratio of solid-liquid ratio of 1:20, stir magnetically at 400 rpm for 16 h, rinse with deionized water, centrifuge until pH is close to 7, filter and place in 105 ℃ Dry in an oven for 2 hours, and grind through a 100-mesh sieve to obtain acid-modified sepiolite;
[0034] (2) placing the acid-modified sepiolite obtained in step (1) in a muffle furnace for high-temperature roasting, heating up at a rate of 5°C/min, reaching the roasting temperature, and continuing for 2h, and cooling to room temperature after roasting is completed, Obtain acid-heat modified sepiolite;
[0035] (3) the acid-heat-modified sepiolite obtained in step (2) and the ZnS loaded in a ratio of 1:10 by mass, in ZnSO 4 After immersion in the solution for 30min, Na was added dropwise 2 The S solution was mixed for 1 min, centrifugally filtered, washed and dried through a 100-mesh sieve to obtain a sepiolite-loaded ZnS composite adsorbent.
[0036] The composite adsorbent obtained in Example 1, taking 0.0100g as the experimental object, was added to 100mL, the initial concentration was 50mg/L, and the initial pH=6.2 Cd 2+ In the solution, under the condition of room temperature 25±1℃, placed in a constant temperature shaking box, after shaking at 130rpm for 24h, the Cd 2+ The adsorption capacity was 191.87 mg/g.

Example Embodiment

[0037] Example 2
[0038] Other conditions are the same as Example 1, the difference is that in step (3), the acid-heat modified sepiolite and the ZnS mass ratio to be loaded are 1:5, other conditions and test conditions are the same as 1, and the sample is the same as Cd. 2+ The adsorption capacity was 101.40 mg/g. Poor compared to Example 1.

Example Embodiment

[0039] Example 3
[0040] Other conditions are the same as Example 1, the difference is that in step (3), the acid-heat modified sepiolite and the ZnS mass ratio to be loaded are 1:2, other conditions and test conditions are the same as 1, and the sample is the same as Cd. 2+ The adsorption capacity was 144.77 mg/g. Poor compared to Example 1.

PUM

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Description & Claims & Application Information

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