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Arsenic removal adsorption material, preparation method thereof and application of arsenic removal adsorption material in removal of As (III) in acid wastewater

A composite adsorption material and water body technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of poor material stability and limited adsorption capacity, achieve high stability, reduce stability, The effect of good application prospects

Inactive Publication Date: 2021-06-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects that the existing single iron-manganese binary oxide is easy to agglomerate as an adsorbent for removing arsenic, thereby limiting its adsorption capacity and poor material stability, the present invention proposes the following technical solutions:

Method used

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  • Arsenic removal adsorption material, preparation method thereof and application of arsenic removal adsorption material in removal of As (III) in acid wastewater
  • Arsenic removal adsorption material, preparation method thereof and application of arsenic removal adsorption material in removal of As (III) in acid wastewater
  • Arsenic removal adsorption material, preparation method thereof and application of arsenic removal adsorption material in removal of As (III) in acid wastewater

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Embodiment 1

[0031] 15% iron-manganese oxide loading rate, Fe / Mn molar ratio is the preparation method of the iron-manganese oxide / calcined oyster shell composite material of 3:1, comprises the following steps:

[0032] S1. Preparation of calcined oyster shell powder:

[0033]Choose discarded oyster shells from a local seafood farm. The oyster shells are rinsed several times with clean water to remove as much impurities and residual meat as possible, and broken into small pieces with a hammer. Soak in dilute hydrochloric acid (1mol / L) for 24h, rinse with water several times, soak in 5% NaOH solution for 8h, wash and dry. Then place it in a vacuum oven at 70°C for 5 hours. After natural cooling, grind with a ball mill, the grinding speed range is 300-500rpm, and the grinding time range is 6-8h. In this embodiment, the grinding speed is 500rpm, and the grinding time is 6h. And pass through a 100-mesh filter sieve (average particle diameter<0.15mm) to obtain oyster shell powder, which is p...

Embodiment 2

[0037] 50% iron-manganese oxide loading rate, Fe / Mn molar ratio is the preparation method of the iron-manganese oxide / calcined oyster shell composite material of 3:1, comprises the following steps:

[0038] S1. Preparation of calcined oyster shell powder:

[0039] Choose discarded oyster shells from a local seafood farm. The oyster shells are rinsed several times with clean water to remove as much impurities and residual meat as possible, and broken into small pieces with a hammer. Soak in dilute hydrochloric acid (1mol / L) for 24h, rinse with water several times, soak in 5% NaOH solution for 8h, wash and dry. Then place it in a vacuum oven at 70°C for 5 hours. After natural cooling, grind with a ball mill, the grinding speed range is 300-500rpm, and the grinding time range is 6-8h. In this embodiment, the grinding speed is 400rpm, and the grinding time is 7h. And pass through a 100-mesh filter sieve (average particle diameter<0.15mm) to obtain oyster shell powder, which is ...

Embodiment 3

[0043] 80% iron-manganese oxide loading rate, Fe / Mn molar ratio is the preparation method of the iron-manganese oxide / calcined oyster shell composite material of 3:1, comprises the following steps:

[0044] S1. Preparation of calcined oyster shell powder:

[0045] Choose discarded oyster shells from a local seafood farm. The oyster shells are rinsed several times with clean water to remove as much impurities and residual meat as possible, and broken into small pieces with a hammer. Soak in dilute hydrochloric acid (1mol / L) for 24h, rinse with water several times, soak in 5% NaOH solution for 8h, wash and dry. Then place it in a vacuum oven at 70°C for 5 hours.

[0046] After natural cooling, grind with a ball mill, the grinding speed range is 300-500rpm, and the grinding time range is 6-8h. In this embodiment, the grinding speed is 300rpm, and the grinding time is 8h. And pass through a 100-mesh filter sieve (average particle diameter<0.15mm) to obtain oyster shell powder, ...

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Abstract

The invention belongs to the technical field of water treatment, and discloses an iron-manganese binary oxide and calcined oyster shell compounded arsenic removal material and application thereof to adsorption of As (III) in water. According to the adsorbent, porous calcined oyster shell with a high specific surface area is adopted as a loading material, potassium permanganate and ferrous sulfate are adopted as core raw materials, iron-manganese binary oxide (FMBO) is formed on pores and the surface of the oyster shell through coprecipitation in a hydrothermal environment, and a brand-new composite adsorbent, namely the iron-manganese binary oxide / calcined oyster shell composite material (FMBO / OS), is prepared. The adsorbent has efficient adsorption performance on As (III) in a water body, and the defects that a traditional single iron and manganese oxide arsenic removal material is prone to agglomeration, so that the adsorption capacity is limited, and the material stability is poor are overcome. Meanwhile, the adsorbing material is low in price, green, free of pollution, simple in synthesis method, convenient to operate and recyclable, provides a choice for removal of arsenic in drinking water and industrial wastewater, and provides possibility for engineering application of arsenic removal adsorbents.

Description

technical field [0001] The invention relates to a composite adsorbent material for removing As(III) in water, specifically provides a composite adsorbent with porous calcined oyster shells as the carrier and iron-manganese binary oxide as the active material, and also relates to its preparation method and its The application of removing As(III) in acid waste water belongs to the technical field of preparation of arsenic removal materials. [0002] technical background [0003] Arsenic, a naturally occurring metalloid, ranks 20th in the earth's crust, about 1.5mg / kg. Elemental arsenic mainly has three forms: yellow arsenic, black arsenic, and gray arsenic. Arsenic-containing organic compounds are less toxic, while inorganic arsenic is usually highly toxic. Arsenic exists mainly in the form of oxyanions (arsenate (AsO43-), arsenite (AsO33-)) in the environment. The common valence states of arsenic in water are As(III) and As(V). As(V) is the main form of arsenic in surface w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C02F1/28B01J20/30C02F101/10
CPCB01J20/08B01J20/0222B01J20/041C02F1/281C02F2101/103
Inventor 赵慧敏宋志莲
Owner DALIAN UNIV OF TECH