Preparation method of magnetic ferric alginate mesoporous carbon microsphere capable of adsorbing heavy metal elements

Abstract

The invention relates to a preparation method of a magnetic ferric alginate mesoporous carbon microsphere capable of adsorbing heavy metal elements. The method comprises the steps that a sodium alginate saturated solution and urea are used for preparing an SAC precursor solution, a ferric alginate microsphere is synthesized through an ionic crosslinking method, and by means of vacuum freezing andhigh-temperature cracking methods, the magnetic ferric alginate mesoporous carbon microsphere (MAMC) with the surface to which nano-iron oxide is attached is obtained. Accordingly, preparation is easy, practicability is high, heat stability is good, and the adsorbing effect of the material on a water body As(III) and As(V) is good; the microsphere (MAMC) has superparamagnetism, separation of solute and solvent under external magnetic field interference can be achieved, therefore, heavy metal ions and materials can be stripped out of the water body after the material is adsorbed and saturated,and heavy metal secondary pollution is greatly avoided. In addition, the MAMC material is high in regeneration capacity and can be recycled multiple times, by conducing desorption and regeneration forfour times, the adsorption rate of the MAMC on As(III) is kept at 90%, and the cyclic utilization rate of the adsorbing material is further increased.

Description

technical field

[0001] The invention relates to the technical field of adsorption materials, in particular to a method for preparing magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metals. Background technique

[0002] With the rapid development of economy, it also brings many industrial pollution problems, such as machinery manufacturing, chemical industry, etc., which produce a lot of heavy metal wastewater in the production process. Heavy metal arsenic (Arsenic) is a highly toxic metalloid element. Arsenic and arsenic compounds widely exist in nature. Studies have found that the toxicity of inorganic arsenic is much greater than that of organic arsenic, and trivalent arsenic is more toxic than pentavalent arsenic. The current treatment methods for arsenic pollution in water mainly include removal, separation and oxidation detoxification , but these two methods are limited by conditions such as complicated process and high treatment cost, a...

Examples

Embodiment 1

[0025] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0026] S1), using a ten-thousand-digit balance, weigh 2g of chemically pure grade (viscosity (10g / L) ≥ 0.02Pa·s) sodium alginate powder and dissolve it in 98mL of deionized water under hot bath conditions to prepare a 2% sodium alginate saturated solution , ready to use after cooling;

[0027] S2), add 2 g of urea to the sodium alginate saturated solution, stir magnetically for 30 minutes and then cool to obtain the SAC precursor solution for use;

[0028] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 5% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in the shape of wa...

Embodiment 2

[0033] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0034] S1), using a ten-thousand-digit balance, weigh 3g of sodium alginate powder of chemical purity (viscosity (10g / L) ≥ 0.02Pa·s) and dissolve it in 97mL of deionized water under hot bath conditions to form 3% saturated sodium alginate Solution, stand-by after cooling;

[0035] S2), add 3 g of urea to the sodium alginate saturated solution, stir magnetically for 30 minutes and then cool to obtain the SAC precursor solution for use;

[0036] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 5% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in the shape of water will be f...

Embodiment 3

[0041] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0042] S1), using a ten-thousand-digit balance, weigh 3g of sodium alginate powder of chemical purity (viscosity (10g / L) ≥ 0.02Pa·s) and dissolve it in 97mL of deionized water under hot bath conditions to form 3% saturated sodium alginate Solution, stand-by after cooling;

[0043] S2), adding 3 g of urea in parts by mass to the saturated sodium alginate solution, stirring with magnetic force for 30 minutes, cooling to obtain the SAC precursor solution for use;

[0044] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 10% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in t...

technical field

[0001] The invention relates to the technical field of adsorption materials, in particular to a method for preparing magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metals. Background technique

[0002] With the rapid development of economy, it also brings many industrial pollution problems, such as machinery manufacturing, chemical industry, etc., which produce a lot of heavy metal wastewater in the production process. Heavy metal arsenic (Arsenic) is a highly toxic metalloid element. Arsenic and arsenic compounds widely exist in nature. Studies have found that the toxicity of inorganic arsenic is much greater than that of organic arsenic, and trivalent arsenic is more toxic than pentavalent arsenic. The current treatment methods for arsenic pollution in water mainly include removal, separation and oxidation detoxification , but these two methods are limited by conditions such as complicated process and high treatment cost, a...

Examples

Embodiment 1

[0025] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0026] S1), using a ten-thousand-digit balance, weigh 2g of chemically pure grade (viscosity (10g / L) ≥ 0.02Pa·s) sodium alginate powder and dissolve it in 98mL of deionized water under hot bath conditions to prepare a 2% sodium alginate saturated solution , ready to use after cooling;

[0027] S2), add 2 g of urea to the sodium alginate saturated solution, stir magnetically for 30 minutes and then cool to obtain the SAC precursor solution for use;

[0028] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 5% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in the shape of wa...

Embodiment 2

[0033] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0034] S1), using a ten-thousand-digit balance, weigh 3g of sodium alginate powder of chemical purity (viscosity (10g / L) ≥ 0.02Pa·s) and dissolve it in 97mL of deionized water under hot bath conditions to form 3% saturated sodium alginate Solution, stand-by after cooling;

[0035] S2), add 3 g of urea to the sodium alginate saturated solution, stir magnetically for 30 minutes and then cool to obtain the SAC precursor solution for use;

[0036] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 5% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in the shape of water will be f...

Embodiment 3

[0041] A preparation method of magnetic iron alginate mesoporous carbon microspheres capable of adsorbing heavy metal elements, comprising the following steps:

[0042] S1), using a ten-thousand-digit balance, weigh 3g of sodium alginate powder of chemical purity (viscosity (10g / L) ≥ 0.02Pa·s) and dissolve it in 97mL of deionized water under hot bath conditions to form 3% saturated sodium alginate Solution, stand-by after cooling;

[0043] S2), adding 3 g of urea in parts by mass to the saturated sodium alginate solution, stirring with magnetic force for 30 minutes, cooling to obtain the SAC precursor solution for use;

[0044] S3), ferric nitrate nonahydrate solid powder is dissolved in deionized water, configured into a 10% ferric nitrate solution, and then the SAC precursor solution is added dropwise to the ferric nitrate solution at a rate of 20 drops / min under stirring conditions, When the SAC precursor solution encounters the ferric nitrate solution, small droplets in t...

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