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Hexavalent chromium-wastewater treatment method integrating 'reduction, adsorption and magnetic removal'

A hexavalent chromium and wastewater technology, applied in the direction of adsorption water/sewage treatment, reduced water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., can solve the problems of practical application limitations, secondary pollution, and high cost of ion exchange methods

Inactive Publication Date: 2016-08-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Trivalent chromium is generally considered to be extremely low in toxicity, and trace amounts of trivalent chromium are beneficial to the metabolism of the human body; however, hexavalent chromium is a highly toxic substance, and its toxicity is more than 1,000 times that of trivalent chromium
However, the reduction precipitation method will produce a large amount of chromium-containing sludge, causing secondary pollution; ion exchange and reverse osmosis methods are difficult to popularize and apply due to high costs; traditional adsorbents such as bentonite, activated carbon, seaweed, etc. are difficult to remove from wastewater after adsorption It is completely separated in the middle, and its practical application is also greatly limited.
In addition, after the ion exchange method, reverse osmosis method and some traditional adsorption methods treat the wastewater containing hexavalent chromium, the chromium still exists in the form of hexavalent chromium, which does not solve the toxicity problem of hexavalent chromium from the root cause, and it is easy to cause secondary pollution. secondary pollution

Method used

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  • Hexavalent chromium-wastewater treatment method integrating 'reduction, adsorption and magnetic removal'
  • Hexavalent chromium-wastewater treatment method integrating 'reduction, adsorption and magnetic removal'

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of magnetic nanoparticles containing primary amine groups on the surface: 1.2 parts of Fe with a particle size of 12nm 3 O 4 And 0.8 parts with a particle size of 15nm γ -Fe 2 O 3 After being coated with silica, disperse in 100 parts of toluene, and ultrasonically shake at room temperature for 10 minutes; then add 1 part dropwise γ -Aminopropyltriethoxysilane coupling agent, while raising the temperature to 85°C and reacting for 16 hours, the product obtained is separated with a magnet and washed repeatedly with absolute ethanol, and finally dried to a constant weight;

[0025] (2) Preparation of magnetic nano-adsorbent: Disperse more than 1 part of the prepared magnetic nanoparticles containing primary amine groups on the surface in 100 parts of dichloromethane, and add 1 part of dicyclohexyl carbon dioxide under continuous stirring and nitrogen protection. Imine, 0.4 parts 4 -Dimethylaminopyridine, 0.2 parts of gentisic acid, react at -20°C for 20 hours aft...

Embodiment 2

[0029] (1) Preparation of magnetic nanoparticles with primary amine groups on the surface: 4 parts with a particle size of 30 nm γ -Fe 2 O 3 Disperse in 120 parts after being coated with silica N,N -In dimethylformamide, and ultrasonically shake at room temperature for 15 minutes; then add 2 parts dropwise γ -Aminopropyltrimethoxysilane coupling agent, while raising the temperature to 100°C and reacting for 20 hours, the product obtained is separated with a magnet and washed repeatedly with absolute ethanol, and finally dried to a constant weight;

[0030] (2) Preparation of magnetic nano-adsorbent: Disperse more than 2 parts of magnetic nanoparticles containing primary amine groups on the surface in 130 parts N,N -In dimethylformamide, add 1.5 parts of diisopropylcarbodiimide, 0.6 parts under the protection of nitrogen under continuous stirring 4 -Dimethylaminopyridine, 0.5 part of pyrogallic acid, react at 40°C for 25 hours after the addition is complete, after the reaction is c...

Embodiment 3

[0034] (1) Preparation of magnetic nanoparticles containing primary amine groups on the surface: 6 parts of Fe with a particle size of 15 nm 3 O 4 After being coated with silica, disperse in 160 parts of toluene, and ultrasonically shake at room temperature for 20 minutes; then add 3 parts dropwise N - β (Aminoethyl)- γ -Aminopropylmethyldimethoxysilane coupling agent, while raising the temperature to 110°C for 28 hours, the obtained product is separated with a magnet and washed repeatedly with absolute ethanol, and finally dried to a constant weight;

[0035] (2) Preparation of magnetic nano-adsorbent: Disperse more than 3 parts of the prepared magnetic nanoparticles with primary amine groups on the surface in 160 parts of phosphate buffer solution, and add 2 parts under continuous stirring and nitrogen protection 1 -( 3 -Dimethylaminopropyl)- 3 -Ethylcarbodiimide, 0.8 parts N -Hydroxysuccinimide, 0.8 parts of protocatechuic acid, react at 40℃ for 28 hours after the addition is com...

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Abstract

The invention discloses a hexavalent chromium-wastewater treatment method integrating 'reduction, adsorption and magnetic removal'. The method comprises the following steps: anchoring a small-molecular phenolic acid compound to the surface, with a primary amine group, of a magnetic nano particle, to prepare a magnetic nano adsorbent; then controlling the ionization degree of a phenolic hydroxyl group on the surface of the adsorbent to realize automatic reduction, adsorption and magnetic removal of hexavalent chromium in the wastewater. The magnetic nano adsorbent realizes 'detoxification' of hexavalent chromium when separating the hexavalent chromium from the wastewater, and secondary pollution in the hexavalent chromium treatment process is avoided.

Description

technical field [0001] The invention relates to a treatment method for wastewater containing hexavalent chromium integrating "reduction-adsorption-magnetic removal", which belongs to the field of sustainable chemical industry. Background technique [0002] Chromium-containing wastewater mainly comes from the production processes of various industries, such as tanning, electroplating, papermaking, petroleum manufacturing, etc. In wastewater, chromium mainly exists in trivalent and hexavalent forms. Trivalent chromium is generally considered to be extremely low in toxicity, and trace amounts of trivalent chromium are beneficial to the metabolism of the human body; however, hexavalent chromium is a highly toxic substance, and its toxicity is more than 1,000 times that of trivalent chromium. Inhalation of trace amounts of hexavalent chromium will lead to nasal septum, bronchial ulcers, inflammation of the liver and throat, and even bronchial cancer; skin contact with hexavalent...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01J20/30B01J20/22B01J20/28C02F1/28C02F1/48C02F1/70C02F101/22C02F1/66
CPCC02F9/00B01J20/103B01J20/22B01J20/26B01J20/28009C02F1/288C02F1/48C02F1/66C02F1/705C02F2101/22
Inventor 陈意官小玉范浩军严孙贤常金明
Owner SICHUAN UNIV
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