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Adsorbent for removing sulfate ions contained in water body as well as preparation and application thereof

A sulfate ion and adsorbent technology, which is applied to the adsorbent for removing sulfate ions in water bodies and the field of sulfate ion removal from acidic industrial wastewater, can solve the problems of disordered sulfur cycle, complicated preparation process, and reduced purity of chlorine gas. , to achieve the effect of multiple cycle adsorption, high desorption efficiency and short adsorption time

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sulfate itself is non-toxic, these wastewaters are directly discharged into water without treatment, which will cause a series of hazards, such as: (1) high concentration of sulfate in water will lead to the disorder of sulfur cycle in nature, and when sulfate ions in water Concentration over 600mg·L -1 diarrhea
(2) Excessive discharge of sulfate ions into the water body can make the soil compact and unable to be used for agriculture
(3) Sulfate ions have a greater impact on industrial production, such as when the concentration of sulfate ions exceeds 5g L in chlor-alkali production -1 It can hinder the discharge of chlorine ions, resulting in a decrease in the purity of chlorine gas, a decrease in current efficiency, and an increase in production energy consumption.
(4) Accelerate the corrosion of equipment pipelines, shorten the service life of equipment pipelines, and reduce production efficiency
However, these adsorbents still have many deficiencies, such as complex preparation process, high cost, or poor adsorption performance, and the adsorption capacity of sulfate is generally only 5-50 mg g -1
[0005] It can be seen that the adsorbents currently used for the adsorption and removal of sulfate ions in wastewater still have major deficiencies. It is very important to develop a new type of sulfate adsorption material with high adsorption capacity, easy operation, and easy desorption.

Method used

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  • Adsorbent for removing sulfate ions contained in water body as well as preparation and application thereof
  • Adsorbent for removing sulfate ions contained in water body as well as preparation and application thereof
  • Adsorbent for removing sulfate ions contained in water body as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation of polym-phenylenediamine

[0020] Dissolve 0.0925mol (10.0g) of m-phenylenediamine (mPD) in 175mL of distilled water, add it into a 250mL four-neck flask, place it in a water bath at 25°C and stir for 20min to fully mix the monomer solution; take 0.0925mol (21.1g ) Ammonium persulfate (APS) was dissolved in 55mL distilled water (1.682mol·L -1 ), gradually added dropwise to the reaction system (completed in about 20 minutes), and continued to stir for 5 hours. Suction filtration, rinse twice with distilled water, 1:1 ammonia water and distilled water respectively. The washed product was dried in an oven at 60° C. to a constant weight to obtain black poly-m-phenylenediamine powder. It was weighed and its yield calculated to be 69%.

[0021] The present invention utilizes poly-m-phenylenediamine to absorb sulfate ions in water, and the specific implementation steps are shown in the following examples.

Embodiment 2

[0023] Under the constant temperature water bath condition of 30 ℃, use 200mg polymer prepared by embodiment 1 to 15mL 2000mg L -1 The sodium sulfate solution was subjected to adsorption reaction, and the reaction time was 60 minutes; the initial pH of the sulfate-containing solution was adjusted to 1.5, 1.65, 1.75, 2.0, 2.5, 3.0, 4.0, and 8, respectively. The reacted mixed solution was filtered and collected in a dry beaker, and the concentration of sulfate ions in the filtrate was determined by barium chromate spectrophotometry. Table 1 shows the adsorption rate and adsorption amount of polymers for sulfate ions at different initial pH values ​​of the solutions. It was found that the lower the pH, the more favorable the adsorption of sulfate ions by polym-phenylenediamine. The results of this example show that the poly-m-phenylenediamine provided by the present invention can effectively treat acid wastewater such as smelting, mining, and pharmaceuticals.

[0024] Table 1 ...

Embodiment 3

[0027] Under the constant temperature water bath condition of 30 ℃, use the polymer prepared by 200mg embodiment 1 to 15mL solution initial pH is 1.75, and sulfate ion is 2000mg L -1 Sodium sulfate solution for adsorption reaction, wherein the reaction time is controlled as 1, 5, 10, 15, 30, 60min. The reacted mixed solution was filtered and collected in a dry beaker, and the concentration of sulfate ions in the filtrate was determined by barium chromate spectrophotometry. Table 2 shows the adsorption rate and adsorption amount of sulfate ions by the polymer at different reaction times.

[0028] It can be seen that the adsorption equilibrium time of poly-m-phenylenediamine is 10min. The adsorption kinetics simulation was carried out with the pseudo-second-order kinetic equation, the correlation coefficient of the simulation was 1, and the standard deviation was -1 .

[0029] Table 2

[0030] Adsorption reaction time min

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Abstract

The invention relates to an adsorbent for removing sulfate ions contained in a water body as well as preparation and application thereof. The adsorbent is a poly (m-phenylenediamine) adsorbent obtained through chemical oxidation polymerization reaction at room temperature by taking m-phenylenediamine as a monomer and ammonium persulfate as an oxidant. The poly (m-phenylenediamine) adsorbent disclosed by the invention has the advantages of simple synthetic process, low cost, good removing effect on sulfate radicals contained in the water body, adsorption quantity reaching more than 107 mg.g<-1> and no secondary pollution; by means of the poly (m-phenylenediamine) adsorbent disclosed by the invention, the treatment effect on waste water with sulfate ion concentration lower than 500 mg.L<-1> can reach more than 95 percent, adsorption rate is high, and adsorption equilibrium can be achieved within 10 minutes; in addition, multiple adsorption results indicate that the desorption rate of poly (m-phenylenediamine) is about 95 percent, and the poly (m-phenylenediamine) can be effectively recycled.

Description

technical field [0001] The invention belongs to the technical field of adsorbents and water treatment thereof, in particular to an adsorbent for removing sulfate ions in water bodies and a preparation and application method thereof, which is suitable for sulfate ions in acidic industrial wastewater in smelting, mining, pharmaceutical and other processes remove. Background technique [0002] High-concentration sulfate wastewater mainly comes from smelting, mining, pharmaceutical and other industries. Although sulfate itself is non-toxic, these wastewaters are directly discharged into water without treatment, which will cause a series of hazards, such as: (1) high concentration of sulfate in water will lead to the disorder of sulfur cycle in nature, and when sulfate ions in water Concentration over 600mg·L -1 Sometimes it can cause diarrhea. (2) Excessive discharge of sulfate ions into the water body can make the soil compact and unable to be used for agriculture. (3) Sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28
Inventor 王海鹰柴立元桑培伦张理源杨志辉彭兵闵小波杨卫春
Owner CENT SOUTH UNIV
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