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Preparation method and application of alumina-loaded nano ferrous sulfide composite material

An alumina-loaded, ferrous sulfide technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc. Nano-iron sulfides are easy to agglomerate and other problems, and the preparation method is simple and efficient, the preparation cycle is short, and the effect is good.

Inactive Publication Date: 2017-05-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcomings of nano-iron sulfides, such as easy aggregation and oxidation, limit its popularization and application in practical engineering.
Nano-iron sulfide has poor dispersion in water, and is easily oxidized and deactivated when exposed to aerobic environment, and then loses the characteristics of nano-materials, greatly reducing its adsorption performance
Secondly, in practical applications, nanomaterials are difficult to recycle and reuse. Once the recycling is not complete, the mercury adsorbed by the material will easily remain in the water body and may be released into the environment again.

Method used

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  • Preparation method and application of alumina-loaded nano ferrous sulfide composite material
  • Preparation method and application of alumina-loaded nano ferrous sulfide composite material

Examples

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Embodiment 1

[0030] Example 1: Preparation of alumina-loaded nano-ferrous sulfide composite material (loading capacity 30%, that is, the mass percentage of ferrous sulfide and alumina is 3:7)

[0031] (1) Alumina carrier pretreatment: Grind the purchased alumina to 100 mesh, soak in 5% nitric acid solution for 30 minutes to remove surface impurities, then wash with deionized water until neutral, and dry in an oven at 110°C for 12 hours, Calcined at 400°C for 4 hours, and finally passed through a 100-mesh sieve to obtain a pretreated alumina carrier.

[0032] (2) Prepare ferrous sulfide particles: weigh 2.105g Na 2 S·9H 2 O and 5g PEG4000 were dissolved in 50mL of deionized water, and the solution was transferred to a 250mL three-necked flask, and the flow rate was 150mL / min under N 2 Ultrasonic dispersion was carried out for 30min under atmosphere (rotational speed was 300r / min); at the same time, another 250mL three-neck flask was filled with deionized water, and the flow rate was 200mL...

Embodiment 2

[0041] Embodiment 2: the preparation of aluminum oxide loaded nano ferrous sulfide composite material (loading capacity 20%)

[0042] (1) The pretreatment of the alumina carrier is as described in step (1) in Example 1.

[0043] (2) The preparation of ferrous sulfide particles is described in step (2) in Example 1. The difference is the addition of Na 2 S·9H 2 O and FeSO 4 ·7H 2 The amounts of O were 1.365 g and 1.580 g, respectively.

[0044] (3) Preparation of alumina-loaded nano-ferrous sulfide composite material is the same as that described in step (3) in Example 1. The difference is that γ-Al 2 o 3 The dosage is 2g.

Embodiment 3

[0045] Embodiment 3: the preparation of alumina-loaded nano ferrous sulfide composite material (loading capacity 40%)

[0046] (1) The pretreatment of the alumina carrier is as described in step (1) in Example 1.

[0047] (2) The preparation of ferrous sulfide particles is described in step (2) in Example 1. The difference is the addition of Na 2 S·9H 2 O and FeSO 4 ·7H 2 The amounts of O are 2.729 g and 3.159 g, respectively.

[0048] (3) Preparation of alumina-loaded nano-ferrous sulfide composite material is the same as that described in step (3) in Example 1. The difference is that γ-Al 2 o 3 The dosage is 1.5g.

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Abstract

The invention belongs to the technical field of water treatment, and in particular relates to a preparation method and application of an alumina-loaded nano ferrous sulfide composite material; the alumina-loaded nano ferrous sulfide composite material is mainly used for treating mercury-containing wastewater. The preparation method of the alumina-loaded nano ferrous sulfide composite material comprises the steps of preparing ferrous sulfide particle suspension liquid by taking a sulfide salt and a divalent ferric salt as raw materials and using a coprecipitation method in the N2 environment; after that, continuously adding alumina suspension liquid, which is taken as a carrier, into the ferrous sulfide particle suspension liquid, and enabling nano ferrous sulfide particles to completely cover the surface of alumina under the conditions of ultrasonic stirring and heating so as to obtain the alumina-loaded nano ferrous sulfide composite material. The alumina-loaded nano ferrous sulfide composite material has the beneficial effects that (1) the preparation method is simple, convenient and efficient, and the material can be synthesized in one step by using the coprecipitation method and is short in preparation period, low in cost and good in effect; (2) by enabling the alumina to be loaded in the composite material, ferrous oxide nanoparticles are effectively dispersed, and the defects that the ferrous oxide nanoparticles are easy to agglomerate and easy to oxidize are overcome.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a preparation method and application of an alumina-loaded nano-ferrous sulfide composite material, which is mainly used for treating mercury-containing wastewater. Background technique [0002] Mercury and mercury compounds are widely distributed in the environment. At present, the annual loss of mercury in the environment in the world is about 5×10 3 t. Due to the persistence, physiological toxicity and high bioaccumulation of mercury, it is easily absorbed by animals and plants, and enters the human body along with the food chain enrichment, thus causing certain damage to the skin, digestive tract, nerve and kidney system, and can cause poisoning or even death in severe cases. . One of the eight major public hazards in the world, "Minamata disease", is a mercury poisoning incident caused by the discharge of industrial mercury-containing wastewater, whi...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F101/20
CPCB01J20/08C02F1/281C02F2101/20
Inventor 孙悦徐新华楼子墨周晓馨吕丹周家盛
Owner ZHEJIANG UNIV
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