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Preparation method of EDTA modified magnetic adsorbent and method for removing trivalent chromium in water

A magnetic adsorbent, trivalent chromium technology, applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc. The effect of short synthesis cycle, stable chemical properties and simple method

Inactive Publication Date: 2016-08-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some domestic scholars use cultivated trivalent chromium to adsorb bacteria to treat trivalent chromium in wastewater. The culture period of bacteria is long, the survival conditions are relatively harsh, and the treatment cost is high.

Method used

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preparation example Construction

[0024] The invention synthesizes the EDTA modified magnetic adsorbent and uses it to remove trivalent chromium in water. The preparation method of the EDTA modified magnetic adsorbent disclosed by the invention, the specific steps are as follows:

[0025] 1) Magnetic Fe 3 o 4 particle preparation

[0026] FeCl 3 ·6H 2 O mixed with anhydrous sodium acetate (Fe 3+ : the molar ratio of sodium acetate is 1:8-1:10) dissolved in ethylene glycol, and FeCl 3 ·6H 2 The ratio of O to ethylene glycol is 10.8g: 400mL, magnetically stirred for 30-40min to form a yellow homogeneous solution, all transferred to the reaction kettle and reacted at 180-200℃ for 10-14h in a blast drying oven, then poured out The supernatant, black magnetic particles precipitated at the bottom of the reaction kettle, was fully washed with nitrogen-filled deionized water to obtain clarification of the supernatant, and then vacuum-dried to obtain magnetic Fe 3 o 4 particle.

[0027] 2) Fe 3 o 4 @SiO 2 ...

Embodiment 1

[0034] 1) Magnetic Fe 3 o 4 Particle preparation: 10.8g FeCl 3 ·6H 2 O and 28.8g of anhydrous sodium acetate were mixed and dissolved in 400mL of ethylene glycol, and magnetically stirred for 40min to form a yellow homogeneous solution, which was then transferred to a reaction kettle and reacted for 12h in a blast drying oven at 190°C. The supernatant was taken out, and the black magnetic particle precipitate at the bottom of the reactor was fully washed with nitrogen-filled deionized water until the supernatant was clear, and then vacuum-dried at 50°C to obtain magnetic Fe 3 o 4 particle.

[0035] 2) Fe 3 o 4 @SiO 2 Synthesis: Weigh 1g of magnetic Fe 3 o 4 Soak the particles in 50mL of 0.1mol / L hydrochloric acid, ultrasonically disperse for 15min, collect them with a magnet, then transfer them to a three-necked flask filled with an alcoholic aqueous solution consisting of 320mL of absolute ethanol and 80mL of deionized water, and add ammonia water at room temperature...

Embodiment 2

[0038] 1) Magnetic Fe 3 o 4 Particle preparation: 10.8g FeCl 3 ·6H 2 O and 28.8g of anhydrous sodium acetate were mixed and dissolved in 400mL of ethylene glycol, and magnetically stirred for 40min to form a yellow homogeneous solution, which was then transferred to a reaction kettle and reacted for 14h in a blast drying oven at 180°C. The supernatant was taken out, and the black magnetic particles at the bottom of the reaction kettle were precipitated, and the supernatant was fully washed with nitrogen-filled deionized water to obtain a clear supernatant, and then vacuum-dried at 50°C to obtain magnetic Fe 3 o 4 particle.

[0039] 2) Fe 3 o 4 @SiO 2 Synthesis: Weigh 1g of magnetic Fe 3 o 4 The particles were immersed in 50mL of 0.1mol / L hydrochloric acid, ultrasonically dispersed for 15min, collected with a magnet, and then transferred to a three-necked flask filled with an alcoholic aqueous solution consisting of 320mL of absolute ethanol and 80mL of deionized water...

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Abstract

A preparation method of an EDTA modified magnetic adsorbent includes the steps of adding Fe3O4@SiO2 particles to methyl alcohol, conducting ultrasonic dispersing for 20-30 min, adding N-[(3-trimethoxysilyl)propyl]ethylenediamine triacetic acid trisodium salt, then adding glacial acetic acid, and conducting ultrasonic dispersing, washing and drying to obtain the EDTA modified magnetic adsorbent. By controlling the ratio of the magnetic Fe3O4@SiO2 particles to EDTA, the EDTA is polymerized on the Fe3O4@SiO2 particles, and the novel EDTA modified magnetic adsorbent is synthesized; the characteristic of Fe3O4@SiO2 magnetic separation is used, the adsorbent has the capacity of the EDTA for complexing and adsorbing trivalent chromium, and is an adsorbent good in application prospect, and the adsorbent is short in synthesis cycle, low in cost, simple in method and good in economic benefit.

Description

technical field [0001] The invention belongs to the technical field of purification of heavy metals in water, and in particular relates to a preparation method of an EDTA modified magnetic adsorbent and a method for removing trivalent chromium in water. Background technique [0002] Chromium is an important environmental pollutant, which mainly comes from the "three wastes" discharged from electroplating, metallurgy, leather, printing and dyeing, and chemical industries. Chromium in the environment mainly exists in two valence states of Cr(Ⅲ) and Cr(Ⅵ). Cr(Ⅲ) exists in the form of cations and has certain carcinogenic and mutagenic abilities. Trivalent chromium and highly toxic hexavalent chromium are used It can be transformed into each other during preservation, and excessive (more than 10ppm) trivalent chromium and hexavalent chromium are fatal to aquatic organisms. Therefore, how to quickly and effectively remove trivalent chromium in water is of great significance to wa...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/22B01J20/30C02F1/28C02F101/22
CPCB01J20/28009B01J20/0229B01J20/103B01J20/22C02F1/288C02F2101/22
Inventor 王家宏邹睿毛敏史佳亦
Owner SHAANXI UNIV OF SCI & TECH
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