Application of aluminum-substituted ferrihydrite in heavy metal adsorption

A technology for ferrihydrite and heavy metals, applied in the direction of adsorption of water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problem of low cadmium adsorption, achieve good removal effect, stable dosage, collaborative adsorption or fixation good effect

Active Publication Date: 2019-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unlike arsenic, cadmium has a low adsorption amount under acidic conditions, and ferrihydrite has a stronger precipitation effect on cadmium in alkaline environments. big gap

Method used

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  • Application of aluminum-substituted ferrihydrite in heavy metal adsorption
  • Application of aluminum-substituted ferrihydrite in heavy metal adsorption
  • Application of aluminum-substituted ferrihydrite in heavy metal adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Nano-aluminum ferrihydrite was synthesized by ferric chloride and aluminum nitrate.

[0056] Configure 1mol L -1 Ferric chloride hexahydrate (A) and 1mol L -1 Aluminum nitrate nonahydrate solution (B), according to the ratio of the amount of Al / Fe+Al substance is 1:20 (take 250mL A and 13.2mL B), 1:10 (take 250mL A and 27.8mL B) and 1:5 (take 250mL A and 62.5mL B) mix the above solution, place it in a 450W power ultrasonic instrument at room temperature and stir the mixed solution at 700 rpm, and dissolve 6mol L -1 Potassium hydroxide rapid titration, the titration speed is controlled at 10mL min -1 , until the pH of the solution is 7.5, continue to maintain the above-mentioned simultaneous ultrasonic and stirring state for about 10 minutes, then stop the ultrasonic and stirring, balance the suspension for 12 hours, and place it in a 450W ultrasonic instrument at room temperature at 700 rpm Stir the suspension, adjust the pH value to 7.5, continue to maintain the abo...

Embodiment 2

[0060] Synthesize ferrihydrite by conventional method

[0061] Configure 1mol L -1 Ferric chloride hexahydrate solution, take 250mL of the solution, and mix 6mol L on a stirrer at 300 rpm -1 Potassium hydroxide rapid titration, the titration speed is controlled at 5mL min -1 , until the pH of the solution is 7.5, balance the suspension for 12 hours, stir again on a stirrer at 300 rpm and adjust the pH to 7.5, then centrifuge, dialyze, freeze-dry, grind finely, and store at 4 ° C, that is Get iron ore ( figure 1 a); The particle size of ferrihydrite is larger (Table 1).

Embodiment 3

[0063] Nano-aluminum ferrihydrite was synthesized by polyferric chloride and polyaluminum sulfate.

[0064] Configuration 100g·L -1 Polyferric chloride (C) and 100g L -1 Polyaluminum sulfate (D) solution, according to the ratio of Al / Fe+Al mass fraction is 1:20 (take 250mL C and 13.2mL D), 1:10 (take 250mL C and 27.8mL D) and 1:5 (take 250mL C and 62.5mL D) mixed the above solution, placed in a 450W power ultrasonic instrument at room temperature and stirred the mixed solution at 700 rpm, and 6mol L -1 Potassium hydroxide rapid titration, the titration speed is controlled at 10mL min -1, until the pH of the solution is 7.5, continue to maintain the above-mentioned simultaneous ultrasonic and stirring state for about 10 minutes, then stop the ultrasonic and stirring, balance the suspension for 12 hours, and place it in a 450W ultrasonic instrument at room temperature at 700 rpm Stir the suspension, adjust the pH value to 7.5, continue to maintain the above-mentioned simultan...

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Abstract

The invention discloses a method for adsorbing heavy metals in wastewater by using aluminum-substituted ferrihydrite. High-concentration arsenic and cadmium are synergistically adsorbed and fixed by nanometer aluminum-substituted ferrihydrite respectively in an acidic environment and an alkaline environment by regulating the pH value, the concentration ratio of arsenic to cadmium and other conditions. An efficient nanometer aluminum-substituted ferrihydrite adsorbent can be synthesized from nontoxic and harmless common crustal elements, and the process is simple; the nanometer aluminum-substituted ferrihydrite has a good removal effect on co-existing arsenic, cadmium and other negative and positive heavy metal ions; the adsorbent also can simultaneously treat mercury, copper, zinc, antimony, bismuth and other heavy metals existing in the forms of negative and positive ions, besides the arsenic and cadmium; and the nanometer aluminum-substituted ferrihydrite synthesized through the process can be used to treat industrial and mining enterprise heavy metal wastewater, and also can be used in emergency heavy metal pollution events of environment water.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment or environmental water heavy metal pollution treatment, and relates to the application of aluminum-substituted ferrihydrite in the adsorption of heavy metals. This application has the characteristics of high heavy metal removal rate, large adsorption capacity, and environmental friendliness. Background technique [0002] Ferrihydrite (Fe 5 HO 8 4H 2 O, ferrihydrite, Fh) is a kind of iron oxyhydroxide, which is very common in sediments and soils, accounting for 50% of its total mass. Due to its high specific surface area and high surface reaction sites, ferrihydrite is considered to be an important adsorbent of heavy metals in sediments and soils, playing a key role in controlling the concentration, migration and transformation of heavy metals. However, minerals in nature are rich in impurities, and aluminum (Al) is the main doping element. The content of Al in sediment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/20C02F101/10
CPCC02F1/281C02F2101/103C02F2101/20
Inventor 郭朝晖黄博肖细元彭驰
Owner CENT SOUTH UNIV
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