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Vulcanized zero-valent manganese nano material as well as preparation method and application thereof

A zero-valent manganese nanometer and zero-valent technology is applied in the field of zero-valent manganese sulfide nanomaterials and their preparation, which can solve the problems of cumbersome preparation methods and high operating costs, achieve high cadmium removal capacity, environmental friendly reaction conditions, and simple preparation methods. Effect

Active Publication Date: 2021-04-13
GUANGZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the material preparation method of above-mentioned prior art is loaded down with trivial details, and operating cost is higher

Method used

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  • Vulcanized zero-valent manganese nano material as well as preparation method and application thereof
  • Vulcanized zero-valent manganese nano material as well as preparation method and application thereof
  • Vulcanized zero-valent manganese nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Preparation of zero-valent manganese sulfide nanomaterials and application of cadmium removal in wastewater

[0060] The preparation method of zero-valent manganese sulfide nanometer material comprises the following steps:

[0061] (1) Dissolving and mixing 0.04mol sodium borohydride and 0.015mol sodium thiosulfate in 0.05L deionized water to prepare a mixed solution;

[0062] (2) 0.02mol manganese sulfate is dissolved in 0.1L deionized water to obtain manganese sulfate solution;

[0063] (3) Under anaerobic conditions, slowly add the above mixed solution into the manganese sulfate solution through a peristaltic pump, continue to stir for 0.5 hours, let it stand for 10 minutes, remove the supernatant, take the precipitate, and use anaerobic water to centrifuge The precipitate was shaken and cleaned in the tube, placed in a centrifuge for centrifugation, and repeated three times, and then vacuum-dried at -30°C for 24 hours to prepare zero-valent manganese sul...

Embodiment 2

[0073] Example 2: Preparation of zero-valent manganese sulfide nanomaterials and application of cadmium removal in wastewater

[0074] According to the preparation method provided in Example 1, the zero-valent manganese sulfide nanomaterial is obtained, and the zero-valent manganese sulfide nanomaterial is tested to treat divalent cadmium wastewater containing different concentrations, and the results are as follows Image 6 shown.

[0075] Image 6 It is the isothermal adsorption curve figure of sulfide zero-valent manganese nanometer material to divalent cadmium in embodiment 2; From Image 6 It can be seen that the removal load of divalent cadmium by zero-valent manganese sulfide nanomaterials is 200 mg / g ( Image 6 The abscissa in "C e "Indicates the concentration of divalent cadmium, and the ordinate "Q e "Indicates divalent cadmium removal load)( Figure 5 The adsorption capacity in describes the kinetic process of cadmium removal, Image 6 Q in e Indicates the ma...

Embodiment 3

[0076] Example 3: Preparation of zero-valent manganese sulfide nanomaterials and application of cadmium removal in wastewater

[0077] Compared with Example 1, the difference in the preparation of zero-valent manganese sulfide nanomaterials in Example 3 is only that the amount of manganese sulfate is 0.03mol (that is, the molar ratio of sodium thiosulfate to manganese sulfate is 0.5:1), and the rest of the preparation methods same.

[0078] The specific surface area of ​​the zero-valent manganese sulfide nanomaterials prepared in Example 3 is about 69.15m 2 / g.

[0079] The zero-valent manganese sulfide nanomaterial prepared in Example 3 was used to treat cadmium-containing wastewater, the treatment process was the same as in Example 1, and the removal rate of cadmium was 96%.

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Abstract

The invention belongs to the field of wastewater treatment materials, and discloses a sulfurized zero-valent manganese nano material as well as a preparation method and application thereof. The vulcanized zero-valent manganese nano material comprises zero-valent manganese and MnS. The preparation method of the vulcanized zero-valent manganese nano material comprises the steps: dissolving and mixing a reducing agent and thiosulfate to prepare a mixed solution, mixing the mixed solution with a manganese salt under an anaerobic condition, stirring for reaction, standing, and removing a supernatant. The specific surface area of the vulcanized zero-valent manganese nano material is not less than 65 m<2> / g, the removal rate of cadmium is not less than 90%, the cadmium removal rate is high, the cadmium removal capacity is high, and the vulcanized zero-valent manganese nano material is suitable for large-scale wastewater treatment.

Description

technical field [0001] The invention belongs to the field of waste water treatment materials, and in particular relates to a zero-valent manganese sulfide nanometer material and a preparation method and application thereof. Background technique [0002] Cadmium is a highly toxic heavy metal element that can enter environmental media through industrial and agricultural processes, such as electroplating, batteries, pigments, plastics, pesticides, and phosphate fertilizers. Excess cadmium in the human body can cause serious damage to the kidneys, lungs, and bones of the human body, and even cause cancer. Due to the toxicity, bioaccumulation and non-biodegradability of cadmium, the U.S. Environmental Protection Agency (US-EPA) regards it as a priority pollutant, and the highest concentration in drinking water set by the World Health Organization (WHO) is 0.003mg / L. According to my country's comprehensive sewage discharge standards, the maximum allowable discharge concentratio...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30C02F1/28C02F1/70C02F101/20
CPCB01J20/0222B01J20/0285B01J20/28004B01J20/02B01J20/3085C02F1/281C02F1/705C02F2101/20
Inventor 李伙生邓胜文张髙生肖唐付解原许正繁龙建友张平张鸿郭刘凤丽廖丹丹陈泽鑫林连花肖桂聪
Owner GUANGZHOU UNIVERSITY
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