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A kind of adsorbent for removing cadmium, its preparation method and use

A technology of adsorbent and leaching agent, which is applied in the field of cadmium pollution control, can solve the problems of complex process, high cost, poor cadmium removal adsorption performance of adsorbent materials, etc., and achieve simple preparation process, high adsorption capacity, and good cadmium removal effect Effect

Active Publication Date: 2020-10-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method is complex in process and high in cost, and the prepared adsorbent material has poor cadmium removal adsorption performance

Method used

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  • A kind of adsorbent for removing cadmium, its preparation method and use
  • A kind of adsorbent for removing cadmium, its preparation method and use
  • A kind of adsorbent for removing cadmium, its preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0074] A preparation method for removing cadmium adsorbent comprises the steps:

[0075] (1) Obtain graphite negative electrode pole piece from waste lithium ion battery, cut described graphite negative pole pole piece into 2cm * 2cm pole piece, get 50 pole pieces after cutting and immerse in 1000mL water ultrasonic stripping, then sieve and Separate the suspension of the carbon material, mix the suspension with the leaching agent at a volume ratio of 10:1 for 2 h, the leaching agent is 80 mL of concentrated hydrochloric acid and 20 mL of hydrogen peroxide, separate the solid from the liquid, dry at 80°C for 8 h, 500 Calcined at ℃ for 2h to obtain purified carbon material;

[0076] (2) Mechanochemically activate the purified carbon material by using a ball mill, the ball-to-material ratio is 10:1, the activation speed is 800rpm, and the activation time is 10h, to obtain the carbon material;

[0077] (3) The carbon material is mixed with the acidic potassium permanganate solut...

Embodiment 2

[0080] The difference from Example 1 is that the purified carbon material in step (2) is graphite.

Embodiment 3

[0082] The difference from Example 1 is that the mass ratio of carbon material to acidic potassium permanganate in the mixed solution is 0.1:1.

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Abstract

The invention relates to a cadmium removal adsorbent as well as a preparation method and application thereof. The adsorbent comprises carbon and MnO2 distributed on the surface of the carbon; the particles of the adsorbent are bridged with one another through MnO2 or carbon; the specific surface area of the cadmium removal adsorbent is 600 to 1300 cm<2> / g. According to the preparation method disclosed by the invention, an anode carbon material of a waste lithium-ion battery is used as a carbon material in the cadmium removal adsorbent and the adsorption capacity of the cadmium removal adsorbent is improved by using a mechanochemical method. By adopting the anode carbon material of the waste lithium-ion battery, the short-range efficient use of wastes can be promoted, and further the aim ofwaste control by waste is achieved; meanwhile, the anode carbon material of the waste lithium-ion battery has more defects and reactivity sites compared with graphite and other carbon materials, andfurther has better adsorption performance. According to the preparation method disclosed by the invention, the mechanochemical method is adopted to treat the carbon material, so that the specific surface area and surface adsorption sites of the carbon material are further improved and the adsorption capacity of the adsorption material is further improved.

Description

technical field [0001] The invention belongs to the field of cadmium pollution control, and specifically relates to a cadmium-removing adsorbent, a preparation method and application thereof. Background technique [0002] Due to the advantages of high specific energy, high voltage, low self-discharge rate, and long cycle life, lithium-ion batteries are widely used in various energy storage fields, including electric vehicles, portable electronic products, and grid energy storage. The large-scale application of lithium-ion batteries has led to the generation of a large number of waste lithium-ion batteries. It is estimated that by 2020, the number of waste lithium-ion batteries in China will reach about 5.5 billion and 400,000 tons. Waste lithium-ion batteries contain lithium, cobalt, copper and other elements and organic electrolytes and other substances, which will endanger human health and the natural environment. The rich metal elements such as cobalt, lithium, nickel a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/20
Inventor 孙峙郝洁曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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