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Carbon-based material adsorbent for removing heavy metals in waste water, its preparation method and application

A carbon-based material and adsorbent technology, which is applied in the field of carbon-based material adsorbent and preparation for removing heavy metals in wastewater, can solve the problems of complex treatment process, secondary pollution, and no discovery, and achieves a simple preparation process and no The effect of secondary pollution and low cost

Inactive Publication Date: 2013-02-27
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface modification is an effective method to improve the adsorption performance of carbon-based materials. At present, the traditional method of surface modification of carbon-based materials at home and abroad is to carry out nitric acid oxidation treatment. However, this modification method has obvious disadvantages: the processing process is complicated. , the reaction of nitric acid to oxidize carbon to produce NO and NO 2 , causing secondary pollution, and the cost of the treatment process itself is relatively high
After searching, no literature reports were found on the use of sodium citrate-supported carbon-based materials for the removal of heavy metal ions in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Preparation of carbon-based material support

[0017] Commercially available coal-based activated carbon (with a specific surface area of ​​800-1000m 2 / g, the total pore volume is 0.5-0.6cm 3 / g, average pore size and 2-3nm) grinding, sieving, take granular activated carbon with a particle size range of 30-60 mesh, rinse with deionized water, and dry.

[0018] 2. Preparation of carbon-based material adsorbent and its application

[0019] Prepare a sodium citrate solution with a mass fraction of 5%, impregnate the above-mentioned carbon-based material carrier with an equal volume method, stir for 0.5 h, let stand at room temperature for 1 d, rinse, and dry at 100°C for 12 h to obtain a sodium citrate content of 0.2% (weight percent ) carbon-based material adsorbent.

[0020] Take 0.6g of the carbon-based material adsorbent and put it into the adsorption pool (volume 250ml), add Cu 2+ 100ml of simulated wastewater with a concentration of 100ppm, controlled tempe...

Embodiment 2

[0022] Prepare a sodium citrate solution with a mass fraction of 10%, impregnate the above-mentioned carbon-based material carrier by an equal volume method (the preparation of the carbon-based material carrier is the same as in Example 1), stir for 0.5h, let stand at room temperature for 1d, and dry at 110°C for 18h to obtain A carbon-based material adsorbent with a sodium citrate content of 0.7 wt%. Take 0.6g of the carbon-based material adsorbent and put it into the adsorption pool (volume 250ml), add Cu 2+ 100ml of simulated wastewater with a concentration of 100ppm, controlled temperature at 20°C, shaking rate at 150rpm, filtered after adsorption for 2.5h, took the supernatant and used an atomic absorption spectrophotometer to measure Cu in the filtrate 2+ concentration. Under this operating condition Cu 2+ The removal rate can reach 89.6%.

Embodiment 3

[0024] Prepare a sodium citrate solution with a mass fraction of 15%, impregnate the above-mentioned carbon-based material carrier by an equal volume method (the preparation of the carbon-based material carrier is the same as in Example 1), stir for 0.5h, let stand at room temperature for 1d, and dry at 110°C for 24h to obtain A carbon-based material adsorbent with a sodium citrate content of 1.1 wt%. Take 0.6g of the carbon-based material adsorbent and put it into the adsorption pool (volume 250ml), add Cu 2+ 100ml of simulated wastewater with a concentration of 100ppm, controlled temperature at 30°C, shaking rate at 150rpm, filtered after adsorption for 2.5h, took the supernatant and measured Cu in the filtrate with an atomic absorption spectrophotometer 2+ concentration. Under this operating condition Cu 2+ The removal rate can reach 97.9%.

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Abstract

The invention discloses a carbon-based material adsorbent for removing heavy metal in waste water, comprising 98.2-99.8% of carbon-based material and 0.2-1.8wt% of sodium citrate modified component, wherein the specific surface area of the carbon-based material is 800-1200 m<2> / g, the total pore volume of the carbon-based material is 0.5-0.7 cm<3> / G(cm<3> / g), and the average aperture of the carbon-based material is 2-4 nm. According to the invention, the preparation process is simple, there is no secondary pollution, and heavy metals in waste water can be efficiently removed.

Description

technical field [0001] The invention belongs to a carbon-based material adsorbent for removing heavy metals in wastewater, a preparation method and application thereof, and in particular relates to a carbon-based material adsorbent for removing heavy metals in wastewater, a preparation method and an application. Background technique [0002] In recent years, with the rapid development of industry, the problem of water pollution has gradually become the focus of attention from all walks of life. Industrial wastewater contains a large amount of heavy metal ions. After being directly discharged into the water, it will cause irreversible damage to life and health through the enrichment of the food chain. At present, there are many methods for the treatment of heavy metal wastewater. The carbon-based material adsorption method is the most widely used in this field due to its advantages of simple operation and high treatment efficiency. However, although this method is simple and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 黄张根仲凯凯韩小金张晓航张昌鸣
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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