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A kind of suspending liquid iron-containing composite reagent and its preparation method and method for efficiently removing selenate in water

A composite reagent, selenate technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment and other directions, can solve the problems of cumbersome operation, low pollution efficiency, low efficiency, etc., and achieves simple operation and novel method. , the effect of low cost

Active Publication Date: 2019-07-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing selenate removal methods in water, there are cumbersome operations, low cleaning efficiency, and low efficiency under high-salt conditions, especially when high-concentration sulfate coexists. One of the purposes of the present invention is to provide a suspension liquid Iron-containing compound reagent, prepared by hydrogen peroxide solution and zero-valent iron powder, including solid phase, liquid phase and colloidal phase, contains a variety of reducing active components, such as new ecological ferrous substances, structural ferrous substances , ferroferric oxide, etc., can effectively improve the electron transfer efficiency, promote the removal of selenate through the reduction pathway, and can synergistically play the role of adsorption, reduction, flocculation, co-precipitation, nano-effect, etc. to quickly and efficiently remove selenate in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Removal of Selenate in Water by Suspended Liquid Iron-Containing Composite Reagent

[0039] Preparation of suspended liquid iron-containing compound reagent: add 50mL ultrapure water, 1.00mL hydrogen peroxide solution (H 2 o 2 mass fraction 30%), adjust the pH to 1.0 with hydrochloric acid, add 1.00 g of reduced iron powder, put the Erlenmeyer flask into a shaker at 250 rpm at 25° C. for 30 minutes.

[0040] The iron-containing composite reagent prepared in this example exists in the form of a suspended liquid, including solid phase, liquid phase and colloidal phase. Hematite, goethite, ferric hydroxide, ferrous hydroxide, ferrous oxide, etc. may also have a fine structure; among them, Fe in the solid phase 0 The mass ratio is 58%, the pH of the liquid phase is 5.6, and the particle size range of the colloidal particles in the colloidal phase is 5-100nm; no residual hydrogen peroxide (less than 0.02mg / L) is detected in the suspended liquid iron-containing composite re...

Embodiment 2

[0045] Removal of selenate in water by suspended liquid iron-containing composite reagent in the presence of high concentration sulfate

[0046] Preparation of suspended liquid iron-containing compound reagent: add 20mL ultrapure water, 1.07mL hydrogen peroxide solution (H 2 o 2 mass fraction 30%), adjust the pH to 1.0 with hydrochloric acid, add 1.20 g of reduced iron powder, place the centrifuge tube on an inversion mixer and mix at room temperature for 15 minutes at a speed of 60 rpm;

[0047] The prepared suspension liquid iron-containing composite reagent includes solid phase, liquid phase and colloidal phase; wherein, Fe in the solid phase component 0 The mass ratio is 76%, the pH of the liquid phase is 4.6, and the particle size range of the colloidal particles in the colloidal phase is 5-100nm; the residual hydrogen peroxide concentration in the suspended liquid iron-containing composite reagent is 0.4mg / L, Fe 2+ The concentration is 2390mg / L.

[0048] Removal of se...

Embodiment 3

[0052] Removal of selenate in water by suspended liquid iron-containing compound reagent in the presence of high concentration of nitrate

[0053] Preparation of suspended liquid iron-containing compound reagent: add 20mL ultrapure water, 1.07mL hydrogen peroxide solution (H 2 o 2 mass fraction 30%), adjust the pH to 1.0 with hydrochloric acid, add 1.20 g of reduced iron powder, place the centrifuge tube on an inversion mixer and mix at room temperature for 15 minutes at a speed of 60 rpm;

[0054] The prepared suspension liquid iron-containing composite reagent includes solid phase, liquid phase and colloidal phase; wherein, Fe in the solid phase component 0 The mass ratio is 76%, the pH of the liquid phase is 4.6, and the particle size range of the colloidal particles in the colloidal phase is 5-100nm; the residual hydrogen peroxide concentration in the suspended liquid iron-containing composite reagent is 0.4mg / L, Fe 2+ The concentration is 2390mg / L.

[0055] Selenate re...

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Abstract

Disclosed is a preparation method for a suspension liquid-state iron-containing composite reagent. The steps are: (1) diluting a hydrogen peroxide solution; (2) adjusting the pH value of the diluted hydrogen peroxide solution with hydrochloric acid; and (3) adding a zero-valent iron powder for a reaction, so as to obtain the suspension liquid-state iron-containing composite reagent, wherein the molar ratio of hydrogen peroxide to zero-valent iron is between 0.2 and 0.8. Also disclosed are an iron-containing composite reagent in a suspension liquid state and a method for removing selenate from water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a suspended liquid iron-containing composite reagent, a preparation method thereof and a method for efficiently removing selenate in water. Background technique [0002] Selenium is an essential trace element for the human body and participates in various life activities of the human body. On the other hand, excessive selenium intake by the human body can lead to acute or chronic poisoning. Because the safety range between the physiologically required intake dose of selenium and the toxic dose is too narrow, the human body is easily poisoned by excessive intake of selenium. Water is an important source of selenium intake for humans, animals and plants. In my country's current comprehensive sewage discharge standards, the first, second, and third-level selenium discharge standards are 0.1, 0.2, and 0.5 mg / L, respectively. The limit value of selenium in surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/52C02F1/70C02F101/10
CPCC02F1/281C02F1/5236C02F1/705C02F2101/106
Inventor 潘丙才单超杨喆贾会超陈佳佳
Owner NANJING UNIV