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Zinc-iron layered double metal hydroxide adsorbent, and application thereof in removal of phosphorus and chromium

A layered bimetallic and hydroxide technology, applied in the direction of alkali metal oxides/hydroxides, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the pollution of fresh water resources, affect people's daily life, and ignore the removal of cations Effect and other issues, to achieve the effect of solving pollution problems, significant social value and research value, and good adsorption effect

Inactive Publication Date: 2019-08-09
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Excessive phosphorus content in rivers and lakes may lead to serious pollution of fresh water resources and affect people's daily life
[0003] Hydrotalcite and hydrotalcite-like are composed of positively charged metal hydroxide main layer and negatively charged interlayer anion, often called layered double metal hydroxide (LDH), also known as anionic clay, with It is an excellent adsorption material because of its large specific surface area, strong interlayer anion exchange capacity, and good thermal stability; most studies have emphasized the removal of anions by LDH, while ignoring its good effect on cations. Removal effect, failed to be effectively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Accurately weigh 4.3134g ZnSO 4 and 1.3901 g FeSO 4 ·7H 2 O(molar ratio Zn 2+ / Fe 2+ =3:1) was dissolved in 30ml distilled water and kept stirring, and at the same time slowly added 1.0mol / L NaOH solution dropwise to the mixed solution until the pH of the mixed solution reached about 7.5 and remained basically unchanged, stirred at a constant speed for 2 hours, and then added to the mixed solution In the solution, the mass fraction of 6% hydrogen peroxide was added dropwise, and the Fe 2+ Oxidized to Fe 3+ , aged at 40°C for 4h, filtered and washed the solid precipitate until neutral, dried at 60°C, and ground through a 100-mesh sieve to obtain ZnFe-LDH.

[0021] Take 50ml of phosphorus-containing simulated wastewater with a concentration of 25mg / L and put it into a stoppered Erlenmeyer flask, adjust the pH to 6, add 0.08g of ZnFe-LDH, stir in a magnetic stirrer at 25°C and 180r / min for 4h, and put it on after adsorption. The supernatant was filtered with a 0.22 μ...

Embodiment 2

[0023] Operation method is the same as embodiment 1.

[0024] Get 50ml of phosphorus-containing simulated waste water of 50mg / L and put it into a stoppered Erlenmeyer flask, Cl — , NO 3 — , SO 4 2— , CO 3 2— The ion concentration was 5, 50mmol / L, the pH of the solution was adjusted to 6, and 0.05g (1g / L) of ZnFe-LDH was added respectively, and stirred in a magnetic stirrer at 25°C and 180r / min for 4h, and the supernatant was absorbed with 0.22 μm syringe filter, the calculated removal rates under the condition of coexistence of different concentrations of anions are respectively Cl — : 70%, 78.5%; NO 3 — : 70.5%, 81.5%; SO 4 2— : 58%, 69.8%; CO 3 2— : 52.2%, 42.3%. The order of the effect of coexisting anions on the adsorption of phosphorus is CO 3 2— >SO 4 2— >Cl — >NO 3 — .

Embodiment 3

[0026] Operation method is the same as embodiment 1.

[0027] Take 50ml of 10mg / L simulated wastewater containing Cr(VI) in a stoppered Erlenmeyer flask, adjust the pH to 7.5, add 0.11g of ZnFe-LDH, stir in a magnetic stirrer at 25°C and 180r / min for 4h, and put on The supernatant was filtered with a 0.22 μm needle filter, and the calculated removal rate was 86.7%.

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Abstract

A zinc-iron layered double metal hydroxide adsorbent is a layered double metal hydroxide ZnFe-LDH. A preparation method of the adsorbent comprises the following steps: appropriate amounts of ZnSO4 andFeSO4.7H2O are weighed, and are dissolved in distilled water; the pH value of the obtained mixed solution is adjusted to 7.5 with a suitable amount of a NaOH solution under a stirring condition by using a magnetic stirrer; the mixed solution is continuously stirred for 2 h; hydrogen peroxide is dropwise added to the mixed solution; the obtained solution is stored at 40 DEG C for 4 h; the obtainedsolution is subjected to suction filtration, and the obtained solid precipitate is washed with deionized water to neutrality; and the washed solid precipitate is dried and ground, and is sieved by a100 mesh screen to obtain the ZnFe-LDH. The layered double metal hydroxide ZnFe-LDH prepared in the invention has an excellent adsorption effect on phosphate radicals and hexavalent chromium, can be used for treating sewage containing phosphorus and chromium, can well solve the problem of pollution of phosphorus-containing wastewater to the environment, and has significant social and research values.

Description

technical field [0001] The invention relates to a zinc-iron layered double metal hydroxide adsorbent and its application for phosphorus and chromium removal, belonging to the technical field of environmental protection. Background technique [0002] In recent years, due to serious soil erosion and a large amount of water and soil loss, a large amount of phosphorus-containing pesticides and fertilizers in the soil have entered the water body, and some wastewater discharged from agriculture and animal husbandry has been directly discharged without standard treatment, resulting in excessive phosphorus content in the water body. The main hazards of excessive phosphorus content in water are: (1) cause eutrophication of water body. When the TP value in the water body exceeds 0.2mg / L, the reproduction of algae will be accelerated, and a large number of aquatic organisms will die or even perish due to insufficient dissolved oxygen, which will eventually lead to the imbalance of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/10C02F101/22
CPCB01J20/06B01J20/28033C02F1/288C02F2101/105C02F2101/22
Inventor 唐朝春许荣明朱蓓吴庆庆
Owner EAST CHINA JIAOTONG UNIVERSITY
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