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A kind of deep purification method of low concentration heavy metal chromium (vi)

A low-concentration heavy metal, deep purification technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of slow mass transfer rate of solid-phase liquid film, etc., to achieve easy industrial expansion, low electric field voltage, no The effect of secondary pollution

Active Publication Date: 2022-05-03
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the problem of slow mass transfer rate of solid-phase liquid film, and is an efficient, green and environmentally friendly heavy metal pollution control method

Method used

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  • A kind of deep purification method of low concentration heavy metal chromium (vi)

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Experimental program
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Effect test

Embodiment 1

[0037] In terms of mass percentage, 3.43% of polyvinylidene fluoride-hexafluoropropylene copolymer, 17.16% of tributyl phosphate, and 79.41% of tetrahydrofuran were magnetically stirred until a homogeneous transparent casting solution was formed, and the casting solution was poured Put it into a flat-bottomed airtight container placed horizontally, communicate with the atmosphere, and volatilize at 25°C to constant weight to obtain a solid-phase liquid film. The shear thickness is 100μm, and the effective membrane area is 3.14cm 2 The liquid membrane is fixed to the central connection part of the osmosis device. Remove the chromium (VI) 12mg / L, pH 1.3, volume 80mL chromium solution at a voltage of 10V, and set the concentration of the analytical phase to 0.5mol L -1 Sodium acetate solution, the volume is 40ml. The magnetic stirring speed is controlled to be 300rmp. After 8 hours of continuous extraction, the concentration of chromium (VI) in the liquid phase of the material ...

Embodiment 2

[0039] In terms of mass percentage, 3.56% polyvinyl chloride, 14.21% tributyl phosphate, 5.0% lauryl alcohol, and 77.23% tetrahydrofuran are co-dissolved, magnetically stirred to a homogeneous transparent casting solution, and the casting solution is poured into Placed horizontally in a flat-bottomed airtight container, open to the atmosphere, volatilize at 35°C to constant weight to obtain a solid-phase liquid film. The cutting thickness is 100μm, and the effective membrane area is 3.14cm 2 The solid-phase liquid film is fixed on the central connecting part of the two mass transfer devices. The volume is 80mL, the pH is 1.3 (hydrochloric acid), the concentration is 12mg / L chromium (Ⅵ) solution is enriched, the volume is 40ml, the acetic acid / sodium acetate buffer solution of pH is 5 is analytical phase. Control the two-phase magnetic stirring speed to 300rmp, and the voltage to 10V. After 12 hours of continuous extraction, the concentration of chromium (Ⅵ) in the feed liquid...

Embodiment 3

[0041] By mass percentage, after mixing 4.0% polyvinyl chloride, 3.0% trioctyl phosphine oxide (TOPO), and 1 / 1 mixture of 93.0% chloroform and tetrahydrofuran, stir with magnetic force until forming a uniform transparent solution, pour Put it horizontally in a flat-bottomed airtight container with a thickness of 1mm, keep it open to the atmosphere, and volatilize at 30°C to constant weight to obtain a solid-phase liquid film with a thickness of 120um. After taking it out, fix it to the central connection part of the osmosis device. The effective membrane area is 3.14cm 2 , with a thickness of 150 μm. Adjust the pH of the low-concentration chromium (VI)-containing aqueous phase containing 12 mg / L chromium (VI) with a volume of 80 ml to 1.3 with hydrochloric acid as the feed liquid phase, and the concentration is 0.1mol L -1 The sodium hydroxide solution is used as the analytical phase, and the volume of the two phases is 80ml. Control the two-phase magnon speed to 300rmp, th...

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Abstract

The invention discloses a method for deep purification of low-concentration heavy metal chromium (VI), which comprises blending and dissolving basic polymers, liquid phase carriers, protective agents, and organic solvents in a certain mass ratio, and preparing solid phases by solvent volatilization phase inversion method liquid film; and an efficient and selective removal method for low-concentration chromium (VI) by an electric film extraction technology under the synergistic action of a solid-phase liquid film and an external electric field. The preparation process of the solid-phase-liquid membrane provided by the invention is simple and convenient, the consumption of chemical reagents is small, and the cost is low. The electromembrane extraction process is synchronous with extraction and stripping, with fast speed, low energy consumption, simple and flexible operation, and no pollution. The deep purification method for chromium (VI) provided by the invention has strong selectivity to chromium (VI), high removal rate, and can realize thorough purification of low-concentration chromium (VI). It is an environmentally friendly treatment method for water bodies polluted by heavy metal chromium.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and industrial wastewater treatment, and relates to a green method and technology for deep purification of low-concentration heavy metal chromium (VI), and its application in deep purification and comprehensive treatment of drinking water or industrial wastewater. Background technique [0002] Chromium (VI) is harmful to human body and ecological environment. Chromium (VI) in water can cause irreversible damage to the ecological environment of streams, and animal ingestion of lethal doses of chromate can lead to cardiovascular failure. Chromium (VI) is rich in industrial sources and widely exists in tanning, papermaking, cooling tower blowdown, electroplating, electrolysis, anodizing tanks, etc., and various industrial cleaning processes. my country's industrial chromium (VI) discharge limit is 1mg / L, and the maximum allowable limit of chromium (VI) in inland waters and drinking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F1/44C02F1/469C02F101/22
CPCC02F1/26C02F1/44C02F1/4696C02F2101/22
Inventor 孟晓荣王磊王旭东吕永涛宋莹莹李佳文
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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