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Absorption agent for repairing water polluted by cadmium and preparation method of absorption agent

A cadmium pollution and adsorbent technology, which is applied in the field of preparation of nano-iron oxide, can solve the problems of unfavorable large-scale synthesis and application of nano-iron oxide, cumbersome operation, secondary pollution, etc., achieve low production cost, good repair effect, and reduce investment Effect

Active Publication Date: 2016-06-15
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano iron oxide synthesized by physical or chemical methods has some problems, such as cumbersome operation, high cost, and the use of dispersants and reducing agents is likely to cause secondary pollution, etc.
Therefore, the inherent drawbacks of traditional methods are not conducive to the large-scale synthesis of nano-iron oxides and their application in practical environments.

Method used

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  • Absorption agent for repairing water polluted by cadmium and preparation method of absorption agent
  • Absorption agent for repairing water polluted by cadmium and preparation method of absorption agent
  • Absorption agent for repairing water polluted by cadmium and preparation method of absorption agent

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Effect test

Embodiment 1

[0026] (1) Fresh laurel leaves are dried at 60°C for 48 hours, crushed through a 5-mesh sieve to obtain laurel leaf powder; weigh 10g of laurel leaves powder, fill them in a nylon mesh bag, and put them into 500ml after the mesh bag is closed Heat and extract in deionized water at 70°C for 1 hour, vacuum filter the extract through a 0.45-micron filter membrane, and collect the filtrate;

[0027] (2) Slowly drop 20ml of 0.2mol / L ferrous sulfate solution into 100ml of laurel leaf extract to make it react, then shake the mixed solution for 1 hour, and at the same time pass through the mixed solution at a flow rate of 20ml / min After the reaction is completed, the mixture is vacuum filtered through a 0.45-micron filter membrane, and rinsed with deionized water until the pH value of the leachate is constant. The resulting solid is dried in a freeze dryer for 10 hours, taken out and ground through a 200-mesh sieve to produce nanometer iron oxide.

Embodiment 2

[0029] (1) Fresh laurel leaves are dried at 70°C for 96 hours, crushed through a 5-mesh sieve to obtain laurel leaf powder; weigh 20g of laurel leaves powder, fill it in a nylon mesh bag, and put it into 500ml after the mesh bag is closed Heat and extract in deionized water at 70°C for 1 hour, vacuum filter the extract through a 0.45-micron filter membrane, and collect the filtrate;

[0030] (2) Slowly drop 20ml of 0.2mol / L ferrous sulfate solution into 100ml of laurel leaf extract to make it react, then shake the mixed solution for 1 hour, and at the same time pass through the mixed solution at a flow rate of 20ml / min Inject compressed oxygen; after the reaction is completed, vacuum filter the mixture through a 0.45 micron filter membrane, and rinse with deionized water until the pH value of the leachate is constant, put the resulting solid in a freeze dryer for 8 hours, take it out and grind it through a 200-mesh sieve to produce nanometer iron oxide.

Embodiment 3

[0032] (1) Fresh laurel leaves are dried at 90°C for 24 hours, crushed through a 5-mesh sieve to obtain laurel leaf powder; weigh 50g of laurel leaves powder, fill it in a nylon mesh bag, and put it into 500ml after the mesh bag is closed Heat and extract in deionized water at 70°C for 1 hour, vacuum filter the extract through a 0.45-micron filter membrane, and collect the filtrate;

[0033] (2) Slowly drop 20ml of 0.2mol / L ferrous sulfate solution into 100ml of laurel leaf extract to make it react, then shake the mixed solution for 1 hour, and at the same time pass through the mixed solution at a flow rate of 20ml / min After the reaction is completed, vacuum filter the mixture through a 0.45-micron filter membrane, and rinse it with deionized water until the pH value of the leachate is constant, put the resulting solid in a freeze dryer and dry it for 12 hours, take it out and grind it through a 200-mesh sieve to produce nanometer iron oxide.

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Abstract

The invention belongs to the preparation field of nano-sized iron oxide and particularly relates to an absorption agent for repairing water polluted by cadmium and a preparation method of the absorption agent.The preparation method includes the steps of firstly, preparing excoecaria cochinchinensis leaf extract; secondly, under room temperature, slowly dripping ferrous sulfate solution of 0.2mol / L into the excoecaria cochinchinensis leaf extract obtained in the first step, and well mixing to obtain mixed liquid; thirdly, feeding compressed oxygen into the mixed liquid obtained in the second step at the flow speed of 10-50ml / minute, and performing oscillatory reaction for 1 hour; fourthly, performing suction filtration on the reaction liquid in the third step after the reaction, washing with deionized water until the pH of leachate is constant, freeze drying the solid obtained by filtration for more than 8 hours, grinding, and sieving with a 200-mesh sieve to obtain the nano-sized iron oxide.The preparation method has the advantages that the method is environmental friendly in raw material, low in cost and free of environmental pollution, the synthesized nano-sized iron oxide can evidently remove the cadmium in the water polluted by the cadmium, and the removing rate reaches up to 82%.

Description

technical field [0001] The invention belongs to the field of preparation of nano-iron oxide, and in particular relates to an adsorbent for repairing cadmium-polluted water bodies and a preparation method thereof. Background technique [0002] Cadmium (Cd) is a highly toxic heavy metal, which is a potential carcinogen in human organs such as lung, kidney and liver. Cadmium enters the environment mainly through electroplating wastewater, pigment production, and phosphate fertilizers. Cadmium has strong mobility in the environment, high bioavailability and is non-biodegradable. It continuously accumulates in the environment and enters the human body through the absorption of plants and animals in the form of food. The biological half-life in the human body is 15-30 years. Toxic effect. According to the survey results of the Ministry of Agriculture in 2003, more than 10% of brown rice in my country has excessive Cd. According to the "National Soil Pollution Survey Bulletin" i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/62
CPCB01J20/06B01J2220/42B01J2220/4806B01J2220/4825C02F1/281C02F2101/20
Inventor 林加奖陈祖亮陈波金晓英
Owner FUJIAN NORMAL UNIV
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