A method for treating arsenic in strongly acidic wastewater using cerium oxide adsorbent

An adsorbent, cerium oxide technology, applied in the fields of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc. High activity, high adsorption capacity, mild effect

Active Publication Date: 2022-04-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problems that the structure of the existing arsenic adsorbent is destroyed in a strong acid environment, the active sites are reduced, and its adsorption capacity is significantly reduced, and it provides a method for treating arsenic in strongly acidic wastewater using a cerium oxide adsorbent. method

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  • A method for treating arsenic in strongly acidic wastewater using cerium oxide adsorbent
  • A method for treating arsenic in strongly acidic wastewater using cerium oxide adsorbent
  • A method for treating arsenic in strongly acidic wastewater using cerium oxide adsorbent

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specific Embodiment approach 1

[0032] Embodiment 1: This embodiment is a method for treating arsenic in strongly acidic waste water with cerium oxide adsorbent, which is specifically carried out according to the following steps:

[0033] Put the cerium oxide adsorbent into the waste water to be treated, and oscillate the adsorption in the constant temperature shaking shaker for 4h~12h, that is to complete the adsorption of arsenic;

[0034] The mass of described cerium oxide adsorbent and the volume ratio of waste water to be treated are 1mg:(1mL~2mL);

[0035] The concentration of arsenic in the wastewater to be treated is 1 mg / L to 300 mg / L, and the arsenic exists in the form of pentavalent arsenic and trivalent arsenic; the pH of the wastewater to be treated is -0.5 to 1;

[0036] The preparation method of described cerium oxide adsorbent is as follows:

[0037] 1. Dissolve sodium hydroxide solid powder in absolute ethanol, and stir ultrasonically for 0.5h to 1h to obtain NaOH-AE mixed solution;

[003...

specific Embodiment approach 2

[0041] Embodiment 2: This embodiment differs from Embodiment 1 in that in Step 1, the sodium hydroxide solid powder is dissolved in absolute ethanol, and the NaOH-AE mixed solution is obtained after ultrasonic stirring for 0.5 h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0042] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the cerium oxide adsorbent is put into the waste water to be treated, and the arsenic adsorption is completed in a constant temperature oscillating shaker for 4 hours. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for treating arsenic in strongly acidic wastewater by using a cerium oxide adsorbent, and relates to a method for treating arsenic in strongly acidic wastewater. The invention aims to solve the technical problems that the structure of the existing arsenic adsorbent is destroyed in a strong acid environment, the active sites are reduced, and its adsorption capacity is significantly reduced. The invention can synthesize cerium oxide nanoparticles at room temperature, has the advantages of mild conditions, simplicity and directness, and can be synthesized in batches. The cerium oxide nanoparticles synthesized by the present invention have relatively high activity under acidic conditions, and still retain high adsorption capacity and removal efficiency, and the highest As(III) adsorption capacity is 54.21 mg / g (pH=1). The arsenic in the water can be completely removed; the cerium oxide nanoparticles synthesized by the invention can adapt to the arsenic-containing wastewater under different concentrations and different pHs. The cerium oxide synthesized by the invention does not change the structure of the cerium oxide material itself when removing arsenic, and there is no risk of secondary pollution.

Description

technical field [0001] The invention relates to a method for treating arsenic in strong acid waste water. Background technique [0002] The metallurgical industry usually produces a large amount of strongly acidic wastewater, which usually contains a large amount of heavy metal ions, such as lead, cadmium, nickel, arsenic, etc. Wastewater containing large-scale heavy metal ions is prohibited from being directly discharged. According to the concept of waste recycling, recycling these heavy metal resources with appropriate methods can easily solve the problem of metal ion pollution and realize the recycling of wastewater. It has high practical application value and great strategic significance. [0003] When dealing with arsenic-containing wastewater in the metallurgical industry, its strongly acidic and high-concentration environment puts forward higher requirements for the selected treatment method. Commonly used methods include ion exchange, membrane filtration, chemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/28016C02F1/281C02F2101/103
Inventor 杨利明胡文斌罗旭彪畅子雯邵鹏辉石慧
Owner NANCHANG HANGKONG UNIVERSITY
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