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Method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater

A technology for adsorbing heavy metals and selectivity, which is applied in separation methods, chemical instruments and methods, and water pollutants. It can solve the problems of poor selectivity of adsorbents, difficulty in recovering heavy metals, and low recovery purity, achieving enhanced adsorption selectivity, Enhanced selectivity and reduced contamination

Active Publication Date: 2020-07-10
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem that existing adsorbents have poor selectivity, which makes it difficult to recover heavy metals from complex water environments in a targeted manner, and the recovery purity is not high, and provides an electric field-enhanced selective adsorption The method of lead ion in heavy metal wastewater

Method used

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  • Method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater
  • Method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater
  • Method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater

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specific Embodiment approach 1

[0016] Specific embodiment 1: This embodiment is a method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater, specifically carried out according to the following steps:

[0017] 1. Tannic acid@graphene oxide conductive airgel is used as the working electrode, Ag / AgCl is used as the reference electrode, and platinum mesh is used as the counter electrode to form a three-electrode system. The sodium nitrate aqueous solution is used as the electrolyte solution, and the current-time method is used. Carry out electrical reduction, the applied voltage is -1.2V~-2V, and the reduction time is 2min~30min to obtain tannic acid@reduced graphene oxide conductive airgel; the concentration of the sodium nitrate aqueous solution is 0.5mol / L~0.6 mol / L;

[0018] 2. The tannic acid@reduced graphene oxide conductive airgel prepared in step 1 was used as the working electrode, Ag / AgCl was used as the reference electrode, and the platinum mesh was used as the co...

specific Embodiment approach 2

[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the preparation method of the tannic acid@graphene oxide conductive airgel described in step one is as follows:

[0020] Mix 2.5mL of graphene oxide dispersion liquid and 1mL of tannic acid aqueous solution evenly, ultrasonically disperse for 20min, then add 1.5mL of deionized water, ultrasonically disperse for 10min, put it in an oven at 90°C for 20h, take it out from the oven Soak in deionized water for 3 minutes, change to clean deionized water every 30 minutes, and continue to soak for 30 minutes until the aqueous solution changes from light yellow to colorless and transparent to wash away excess tannic acid; finally freeze-dry for 24 hours, That is, tannic acid@graphene oxide conductive airgel is obtained;

[0021] The concentration of the graphene oxide dispersion is 4 mg / mL, and the solvent is deionized water, purchased from Bailingwei Technology Co., Ltd.;

[0022] T...

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, an electrochemical workstation CHI760E is used for electroreduction using the current-time method. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for electric field enhanced selective adsorption of lead ions in heavy metal wastewater, and relates to a method for recovering lead ions from heavy metal wastewater.The invention aims to solve the technical problems of difficulty in targeted recovery of heavy metals from complex water environments and low recovery purity caused by poor selectivity of existing adsorbents. A tannic acid@graphene oxide conductive aerogel material is applied to a water body heavy metal electrochemical adsorption system as a conductive adsorbent, and under the action of an electric field, the adsorption selectivity of the tannic acid@graphene oxide conductive aerogel material to Pb<2+> is enhanced. According to the method disclosed by the invention, the conductive layer of thetannic acid@graphene oxide conductive aerogel material can be optimized through electrochemical reduction, so that the material has better conductivity, and has better selectivity to lead ions underthe action of an electric field. The method is applied to recovery of lead from metal wastewater.

Description

technical field [0001] The invention relates to a method for recovering lead ions from heavy metal wastewater. Background technique [0002] With the rapid development of industrialization, a large number of pollutants are released into the aquatic environment, which has caused serious environmental challenges on a global scale. On the other hand, heavy metal resources are increasingly depleted, and selective recovery of heavy metal resources is a major challenge to achieve sustainable development. The environment of heavy metal polluted wastewater is generally complex, and there are many symbiotic ions, which makes it difficult to selectively recover heavy metal ions. Traditional methods for remediating heavy metal-polluted water bodies include chemical precipitation, electrocoagulation, membrane filtration, and ion exchange. However, these methods have some disadvantages, such as high cost of chemical sludge method, difficult regeneration and fouling. Adsorption is cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/20
CPCC02F1/469C02F2101/20C02F2201/46C02F1/46109C02F1/4678C02F2001/46133C02F2001/46161C02F1/288C02F2201/46135C02F1/4691C02F2001/46138C02F1/4676C01B32/198C02F1/281C02F1/62
Inventor 罗旭彪畅子雯杨利明易根平倪晨权邵鹏辉石慧
Owner NANCHANG HANGKONG UNIVERSITY
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