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Method for adsorbing heavy metals by using three-dimensional compound consisting of graphene sheet and magnetotactic bacteria

A technology for adsorbing heavy metals and graphene sheets, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc. Low cost and variety of effects

Inactive Publication Date: 2012-04-18
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with publication number CN101973620A proposes a method for removing heavy metal ions in water by using graphene oxide sheets. Although it can realize the adsorption and purification of some heavy metal ions, there are limited types and quantities of heavy metal ions that can be adsorbed. Disadvantages of inconvenient tablet recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Enrichment culture of magnetotactic bacteria in Taihu Lake sludge: Take the Taihu Lake surface sludge and wash it with normal saline, remove the supernatant after gravity sedimentation, leave the precipitate and add the enrichment medium, and culture at room temperature for 30 days, during which time the culture medium is changed every three days .

[0036] Medium: NaNO 3 250 mg / L, CH 3 COONa 200 mg / L, HOOCCH 2 CH 2 COONa 1000 mg / L, Quinate iron 2 ml / L, ZnSO 4 50 mg / L, MnSO 4 50 mg / L, MgSO 4 ·7H 2 O 50 mg / L, Vit.B 12 50 mg / L, Sodium thioglycolate 100 mg / L.

[0037] The enriched magnetotactic bacteria are collected using a patented two-way magnetotactic bacteria collection device (the device mentioned in the publication number CN 101735937 A). More than 90% of the microaerobic bacteria collected by this method are magnetotactic bacteria, and the enriched bacteria liquid is combined with graphene.

[0038] Magnetotactic bacteria and Magnetospira AMB-1 ( Ma...

Embodiment 2

[0040] Get 450mg of concentrated bacterial solution of magnetotactic bacteria enriched in the aforementioned Taihu Lake silt, under constant stirring at room temperature, slowly add to 100ml, in the reduced graphene oxide sheet solution of 0.5mg / ml, after adding, continue to stir for 30min, Mix well to form a three-dimensional compound. Add the prepared three-dimensional complex solution to 1 L, containing Fe 3+ 、Ni 2+ 、 Cu 2+ In the sewage with each ion concentration of 50mg / L, after stirring at room temperature for 1 hour, let it stand for 30 minutes, collect the complex with a magnetic field, take the treated sewage and use atomic absorption spectrometry to detect the content of various heavy metal ions, and found that Fe 3+ The removal rate of ions is 98.7%, Ni 2+ The removal rate of ions is 99.3%, Cu 2+ The removal rate of ions was 97.4%.

Embodiment 3

[0042] Get 350 mg of the concentrated bacterial solution of the magnetotactic bacteria and Magnetospira AMB-1 mixed bacteria enriched in the aforementioned Taihu Lake silt, slowly add it to 100 ml, 1.5 mg / ml graphene oxide sheet solution under constant stirring at room temperature, After the addition, continue to stir for 30 minutes to fully mix into a three-dimensional complex, and then add the prepared three-dimensional complex solution to 1L, containing Au 3+ In the sewage with an ion concentration of 150mg / L, after stirring at room temperature for 1 hour, let it stand for 30 minutes, collect the complex with a magnetic field, take the treated sewage and use atomic absorption spectrometry to detect Au 3+ Ion content, found in Au 3+ The ion removal rate can reach 99%.

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Abstract

The invention discloses a method for adsorbing heavy metals by using a three-dimensional compound consisting of a graphene sheet and magnetotactic bacteria. The method comprises the following steps of: fully mixing the graphene sheet and the magnetotactic bacteria in a liquid phase system to form a graphene sheet-magnetotactic bacteria three-dimensional compound; adding the graphene sheet-magnetotactic bacteria three-dimensional compound into sewage containing heavy metal ions; fully mixing to reach adsorption balance; and separating the graphene sheet-magnetotactic bacteria three-dimensionalcompound out by using an external magnetic field to realize the purification of sewage. The method has the advantages of simple process, capability of simultaneously treating sewage containing high-concentration complex heavy ion components such as Au<3+>, Fe<3+>, Ni<2+>, Cu<2+>, Pb<2+>, Cr<2+> and the like at the removing rate over 90 percent, recycling of the graphene sheet-magnetotactic bacteria three-dimensional compound through a magnetic field, low cost, environmental friendliness and no secondary pollution.

Description

technical field [0001] The invention relates to a treatment method for sewage containing heavy metal ions, in particular to a method for adsorbing and purifying heavy metals using a three-dimensional composite of graphene sheets and magnetotactic bacteria, belonging to the fields of water quality purification and environmental protection. Background technique [0002] With the rapid development of industry and agriculture in my country, the discharge of wastewater containing heavy metal ions is increasing year by year. On the one hand, the content of heavy metals in various wastewaters is increasing, and the types of heavy metals are becoming increasingly complex. On the other hand, considering the long-term and seriousness of the harm caused by heavy metals to the human body and the environment, the national standards for the harmless treatment of wastewater containing heavy metals are becoming more and more stringent. Therefore, how to remove heavy metal ions in wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F1/64C02F101/20C02F101/22
Inventor 宋琴张琦李宁唐明亮张蓓蓓苏瑞巩孔涛于昊程国胜
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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