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Modified activated carbon, preparation method thereof and method for removing bromate in water

A technology of activated carbon and bromate, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of low adsorption efficiency of raw carbon, weakened removal effect of bromate, and shedding of modifiers.

Active Publication Date: 2020-06-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption efficiency of raw carbon is not high
[0004] The modified activated carbon method has better adsorption performance than the traditional activated carbon, but the existing modified activated carbon has the following disadvantages: first, the modifier is easy to fall off during the water treatment process; The removal effect is greatly reduced

Method used

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  • Modified activated carbon, preparation method thereof and method for removing bromate in water
  • Modified activated carbon, preparation method thereof and method for removing bromate in water
  • Modified activated carbon, preparation method thereof and method for removing bromate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Provide a kind of modified active carbon, make like this:

[0067] Step (1): First, take 1.5 g of pretreated coal-based activated carbon (GAC-O) and immerse it in (3-chloro-2-hydroxypropyl) dodecyldimethyl ammonium chloride (QUAB342) solution, The dosage ratio of QUAB342 / GAC-O was 3.81g / g, and it was stirred at room temperature for 24 hours to make the quaternary ammonium salt and activated carbon evenly mixed. Among them, the coal-based activated carbon pretreatment steps include: firstly crush the activated carbon with a pulverizer, then sieve it with a 200-mesh and 400-mesh sieve, select activated carbon between 200-400 mesh, and wash it with deionized water until it reaches 400 mesh. Put the water flowing down the mesh sieve into a 100mL evaporating dish, wash it three times with pure water, and finally put it in a drying oven at 105°C for 10 hours before use.

[0068] Step (2): At 30° C., add 1 mol / L NaOH solution, adjust the pH to 8.5, and react for 48 hours.

...

Embodiment 2

[0072] The basic steps are the same as in Example 1, except that the mass of activated carbon is 1.5g, the dosage of QUAB342 is 4.17g, the modification temperature is 50°C, and the modification pH is 12.

Embodiment 3

[0074] The basic steps are the same as in Example 2, except that the activated carbon is coconut shell activated carbon.

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Abstract

The invention relates to the field of water treatment, in particular to modified activated carbon, a preparation method thereof and a method for removing bromate in water. The method comprises the following steps: reacting the epoxidized quaternary ammonium salt solution with activated carbon to prepare the modified activated carbon; mixing the modified activated carbon with an aqueous solution containing bromate, and adsorbing to remove bromate. According to the method, the epoxidized quaternary ammonium salt is adopted to modify activated carbon, so that epoxidized functional groups and oxygen-containing functional groups on the surface of the activated carbon are subjected to a cationization reaction, quaternary ammonium salt functional groups and activated carbon chemical bonds are combined, the connection strength is improved, and the activated carbon is not prone to falling off in the water treatment process. After the modified activated carbon is in contact with bromate ions inwater, on one hand, nitrogen-containing functional groups with positive charges in quaternary ammonium salt have a strong electrostatic adsorption effect on bromate with negative charges; and on theother hand, alkyl long chains in the quaternary ammonium salt have strong adsorption attraction on the surface of the modified activated carbon, so that the removal effect on bromate is greatly improved under the dual effects.

Description

technical field [0001] The application relates to the field of water treatment, in particular to a modified activated carbon, a preparation method thereof and a method for removing bromate in water. Background technique [0002] Bromate is an emerging pollutant with high levels in coastal areas and may be present in drinking water as a disinfection by-product. Long-term consumption of drinking water containing bromate will greatly increase the incidence of kidney cancer, thyroid and peritoneal mesothelioma. Bromate has been designated as a 2B-level potential carcinogen by the International Agency for Research on Cancer. [0003] At present, the removal methods of bromate in water mainly include activated carbon adsorption, ultraviolet (UV) radiation, iron (Fe(II)) reduction, electrocatalytic reduction, ion exchange membrane and other methods. Because other methods have the disadvantages of high cost and easy to cause secondary pollution, activated carbon adsorption method h...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/12
CPCB01J20/20B01J20/22C02F1/28C02F2101/12
Inventor 侯嫔赵俊慧王若男岳烨刘昊张南南彭莲
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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