Green rust material and preparation method and application thereof

A green rust and iron-based technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of limited adsorption capacity, small specific surface area and narrow application range of heavy metal pollutants, etc. Achieve the effect of excellent heavy metal adsorption performance, large pH application range, and simple preparation process

Active Publication Date: 2020-05-12
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis process of nano-ZVI requires the use of a large amount of reducing agent, which not only makes the loading efficiency of cyclodextrin low, but also produces a large amount of reducing agent to pollute the waste liquid.
At the same time, the added cyclodextrin did not change the physicochemical properties of the nano-zero-valent iron itself
The green rust material synthesis process itself does not require the use of reducing agents, but the specific surface area of ​​the green rust material synthesized by the hydrothermal method is small, and the adsorpti

Method used

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  • Green rust material and preparation method and application thereof
  • Green rust material and preparation method and application thereof
  • Green rust material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Influence of the molar ratio of ferrous ions and ferric ions on the adsorption performance of the prepared novel green rust adsorbent

[0026] Weigh sulfuric acid according to the molar ratio of ferrous ion to ferric ion 1:1, 1.5:1, 1.8:1, 2:1, 3:1, 4:1, 4.2:1, 4.5:1, 5:1 Ferrous and ferric sulfate were mixed and stirred evenly to obtain nine groups of iron-based reagents. Dissolve the nine groups of iron-based reagents in water, and stir under sealed conditions until the iron-based reagents are completely dissolved to obtain nine groups of iron-based solutions, in which the concentration of ferrous ions is 0.2M. Nine groups of sodium hydroxide were weighed according to the molar ratio of hydroxide to total iron ions (ferrous ion + ferric ion) of 3:1. Dissolve nine groups of sodium hydroxide into water, stir under sealed conditions, and prepare nine groups of 2M sodium hydroxide solutions. Nine groups of β-cyclodextrin were weighed according to the molar rat...

Embodiment 2

[0033] Example 2 Effect of Hydroxide and Total Iron Ion Molar Ratio on the Adsorption Performance of the Prepared Novel Green Rust Adsorbent

[0034] Weigh ferrous sulfate and ferric sulfate respectively according to the molar ratio of ferrous ions and ferric ions of 4:1, mix and stir evenly to obtain an iron-based reagent. Dissolve the iron-based reagent in water, and stir under sealed conditions until the iron-based reagent is completely dissolved to obtain an iron-based solution in which the concentration of ferrous ions is 0.4M. According to the molar ratio of hydroxide to total iron ion (ferrous ion + ferric ion) 2.5:1, 2.7:1, 2.9:1, 3:1, 3.5:1, 4:1, 4.1:1, 4.3: 1. Weigh nine groups of sodium hydroxide at 4.5:1 respectively. Dissolve nine groups of sodium hydroxide into water, stir under sealed conditions, and prepare nine groups of 3.5M sodium hydroxide solutions. Nine groups of β-cyclodextrins were weighed according to the molar ratio of β-cyclodextrin to total iron i...

Embodiment 3

[0040] Example 3 Effect of β-cyclodextrin to total iron ion molar ratio on the adsorption performance of the prepared novel green rust adsorbent

[0041] Weigh ferrous sulfate and ferric sulfate respectively according to the molar ratio of ferrous ions and ferric ions of 4:1, mix and stir evenly to obtain an iron-based reagent. Dissolve the iron-based reagent in water, and stir under sealed conditions until the iron-based reagent is completely dissolved to obtain an iron-based solution in which the concentration of ferrous ions is 0.6M. Sodium hydroxide was weighed according to the molar ratio of hydroxide ions to total iron ions (ferrous ions + ferric ions) of 4:1. Dissolve sodium hydroxide in water and stir under sealed conditions to prepare 5M sodium hydroxide solution. According to the molar ratio of β-cyclodextrin to total iron ion (ferrous ion + ferric ion) 1:100, 1.5:100, 2:100, 2.5:100, 5:100, 7.5:100, 8:100, 8. Weigh nine groups of β-cyclodextrin at 5:100 and 9:100 ...

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Abstract

The invention discloses a green rust material and a preparation method and application thereof. The preparation method comprises the following steps: separately weighing ferrous sulfate and ferric sulfate, and carrying out mixing and uniform stirring to obtain an iron-based reagent; dissolving the iron-based reagent in water, and carrying out stirring under a sealed condition until the iron-basedreagent is completely dissolved to obtain an iron-based solution; adding beta-cyclodextrin into a sodium hydroxide solution, and carrying out stirring under a sealed condition until beta-cyclodextrinis completely dissolved to obtain cyclodextrin alkali liquor; and mixing the cyclodextrin alkali liquor with the iron-based solution, carrying out uniform stirring under a sealed condition, performingaging for 5-15 minutes, and conducting centrifuging, drying in vacuum and grinding into powder to obtain the green rust material. Compared with a traditional green rust adsorption material, the novelgreen rust adsorption material prepared by the preparation method disclosed by the invention has a larger specific surface area, more excellent heavy metal adsorption performance, applicability to awide range of pH values and a higher material recovery rate.

Description

technical field [0001] The invention relates to the field of heavy metal polluted wastewater treatment, in particular to a patina material and its preparation method and application. Background technique [0002] Patina is a typical layered double hydroxide, which contains ferrous and ferric ions. Common patina includes patina mixed with sulfate, patina mixed with carbonate, and patina mixed with chloride ions. The molecular structure of green rust is [Fe(II) 1-x Fe(III) x (OH) 2 ] x+ ·[(x / n)A n- , mH 2 O] x- , where A n- Represents the anion doped in the green rust layer, x represents the molar ratio of ferric iron to total iron (0.25-0.33). The surface of the iron hydroxide layer is positively charged due to the substitution of ferric ions for ferrous ions. Based on the charge balance mechanism, a series of anions can be incorporated into the layered double hydroxide structure during the synthesis. Different anions have a great influence on the interlayer struct...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/06B01J20/22C02F1/281C02F1/285C02F2101/20
Inventor 黄涛刘万辉宋东平金俊勋刘龙飞张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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