Preparation method of modified activated carbon used for heavy metal wastewater treatment

A wastewater treatment and activated carbon technology, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of unfavorable ion transport activated carbon regeneration, treatment effect not meeting requirements, and damage to the pore structure and other issues, to achieve the ability to strongly adsorb heavy metals and organic pollutants, remove heavy metal ion pollution, and remove organic pollution

Active Publication Date: 2015-04-22
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at heavy metal pollution, people have developed a variety of water treatment methods, such as chemical precipitation, ferrite, adsorption, ion exchange, electrolysis, reverse osmosis, electrodialysis, enhanced ultrafiltration, biological methods, etc. There are some shortcomings and deficiencies: (1) Some treatment costs are high, such as enhanced ultrafiltration, electrodialysis, chelation precipitation in chemical precipitation, ion exchange, etc.; (2) Some processes are complex and cumbersome to operate, Such as ferrite method, enhanced ultrafiltration method; (3) Some treatment effects cannot meet the requirements, such as traditional chemical pre

Method used

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  • Preparation method of modified activated carbon used for heavy metal wastewater treatment
  • Preparation method of modified activated carbon used for heavy metal wastewater treatment
  • Preparation method of modified activated carbon used for heavy metal wastewater treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Take 100g of fruit shell activated carbon and wash the surface with distilled water, then ultrasonically clean it for 30 minutes, then wash it with distilled water, and dry it at 120°C to constant weight; then grind it, pass it through 60 mesh and 100 mesh sieve respectively, and take a 60 mesh sieve Control the particle size of the activated carbon at 150-250 μm for the lower matter and the upper matter of a 100-mesh sieve; then take 40 g of activated carbon and immerse in distilled water for 60 minutes, take it out and drain until there is no obvious water mark on the surface;

[0037] (2) the activated carbon of step (1) gained is packed in the boiling sprinkler, feed clean air from the bottom of the device and the activated carbon particles are blown to boiling state, spray 8.0mol / L nitric acid solution for 2 minutes by the top of the upper cone, and then Blow hot air at 60°C from the bottom until there is no obvious water trace on the surface; transfer to a clos...

Embodiment 2

[0045] (1) Take 100g of fruit shell activated carbon and wash the surface with distilled water, then ultrasonically clean it for 30 minutes, then wash it with distilled water, and dry it at 110°C to constant weight; then grind it, pass it through 60 mesh and 100 mesh sieve respectively, and take a 60 mesh sieve Control the particle size of the activated carbon at 150-250 μm for the lower matter and the upper matter of a 100-mesh sieve; then take 40 g of activated carbon and soak in distilled water for 50 minutes, take it out and drain until there is no obvious water mark on the surface;

[0046] (2) the gac of step (1) gained is packed in the boiling sprinkler, feed clean air from the bottom of the device and the gac particles are blown to a boiling state, spray 6.0mol / L nitric acid solution for 2 minutes by the top of the upper cone, and then Blow hot air at 50°C from the bottom until there is no obvious water trace on the surface; transfer to a closed stainless steel containe...

Embodiment 3

[0051] (1) Take 100g of fruit shell activated carbon and wash the surface with distilled water, then ultrasonically clean it for 30 minutes, then wash it with distilled water, and dry it at 100°C to constant weight; then grind it, pass it through 60 mesh and 100 mesh sieve respectively, and take 60 mesh sieve Control the particle size of the activated carbon at 150-250 μm for the lower matter and the upper matter of a 100-mesh sieve; then take 40 g of activated carbon and soak in distilled water for 40 minutes, take it out and drain until there is no obvious water mark on the surface;

[0052] (2) the gac of step (1) gained is packed in the boiling sprinkler, pass into clean air from the bottom of the device and the gac particles are blown to a boiling state, spray 10.0mol / L nitric acid solution for 2 minutes by the top of the upper cone, and then Blow hot air at 55°C from the bottom until there is no obvious water trace on the surface; transfer to a closed stainless steel cont...

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Abstract

The invention discloses a preparation method of modified activated carbon used for heavy metal wastewater treatment. The preparation method comprises the steps that firstly, activated carbon is washed, dried, ground, sieved and soaked, so that pores of the activated carbon are filled with water; secondly, clean air is blown so that the activated carbon can be in a boiling state, and an oxidizing agent is sprayed for controllable oxidation; thirdly, N-(2,3-glycidyl) iminodiacetic acid disodium allows iminodiacetic acid disodium to be connected to the surface of the activated carbon through epoxy group ring opening. According to the prepared modified activated carbon, hydroxyls, carboxyls and iminodiacetic acid groups having a strong effect on heavy metal ions are introduced only on the surface, the original hole channel structure feature of the activated carbon is maintained, the capacities of strong heavy metal adsorption and organic pollutant removal are both achieved, and the dual purposes of removing heavy metal and organic pollution can be achieved by one step through adsorption via activated carbon. Meanwhile, the adsorbed heavy metal is easy to recycle, the activated carbon is easy to regenerate, the cycle service life of the activated carbon is long, no secondary pollution will occur, and therefore the preparation method has good application and popularization prospects.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a preparation method of modified activated carbon used for heavy metal wastewater treatment. Background technique [0002] Heavy metals cannot be degraded by microorganisms, can be enriched in organisms and cause significant toxic effects, and are persistent pollutants. For example, mercury, cadmium, chromium, lead, arsenic, etc. seriously endanger human health, damage aquatic ecosystems, reduce agricultural and fishery production, etc., causing huge economic losses and becoming a major problem restricting my country's economic and social development and improving people's livelihood. Aiming at heavy metal pollution, people have developed a variety of water treatment methods, such as chemical precipitation, ferrite, adsorption, ion exchange, electrolysis, reverse osmosis, electrodialysis, enhanced ultrafiltration, biological methods, etc. There are some shortcomin...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C07D303/36C07D301/27
CPCB01J20/22B01J20/3085B01J2220/4806C02F1/285C07D301/27C07D303/36
Inventor 刘立华杨刚刚周智华唐安平王易峰
Owner HUNAN UNIV OF SCI & TECH
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