Heavy metal ion adsorbent and preparation and application method thereof

A technology for heavy metal ions and adsorbents, which is applied in the field of environmental engineering, can solve the problems of long time consumption, insignificant effect of direct thiolation modification of wheat spent grains, etc., and achieves the effects of cheap treatment and cost saving.

Inactive Publication Date: 2010-08-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method takes a long time and has no obvious effect on direct thiol modification of wheat grains

Method used

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  • Heavy metal ion adsorbent and preparation and application method thereof
  • Heavy metal ion adsorbent and preparation and application method thereof
  • Heavy metal ion adsorbent and preparation and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 50mL respectively and the initial concentration is 0.2mmol·L -1 heavy metal ions (Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ ) solution, each adding 0.1 g of the above-prepared adsorbents, adjusting the pH values ​​of the solutions to 2, 3, 4, 5, 6, 7, 8, 9, and 10, and stirring at room temperature for 90 minutes for adsorption. The removal rates of different heavy metal ions at various pH values ​​were investigated before and after mercapto-modification of wheat grains. figure 2 shown. In general, mercapto-modified wheat grains have a good adsorption effect on heavy metal ions in a wide pH range, and for Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ , the optimal adsorption pH ranges are 3-7, 3-10, 6-9, 4-9 respectively. Good pH adaptability is conducive to the application of mercapto-modified wheat grains in the adsorption of actual complex industrial wastewater.

Embodiment 2

[0039] Take 50mL of the initial concentration of 10mmol L -1 Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ Four kinds of heavy metal ion solutions, add 0.1g of unmodified wheat grains or 0.1g of mercapto-modified wheat grains prepared above, and use 0.1mol L -1 HNO 3 or 0.1mol·L -1 Adjust the pH value to about 6 with NaOH, at a speed of 200r min -1 , adsorbed in a constant temperature water bath magnetic stirrer at a temperature of 25° C. for 30 min and 90 min, respectively, and filtered the supernatant. Measure the concentration of each heavy metal ion remaining in the filtrate, and calculate the corresponding adsorption capacity, the result is as follows image 3 shown. The results showed that the effect of mercapto-modified wheat grains on Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ The adsorption amounts were 89.53, 209.45, 227.37, 303.25 mg·g -1 , while the adsorption capacities of unmodified wheat grains to heavy metal ions were only 71.05, 67.46, 125.76, 207.34 mg·g -1 . It can be seen ...

Embodiment 3

[0041] Accurately weigh 0.1 g of the mercapto-modified wheat grains prepared above and add to 50 mL of heavy metal ion (Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ ) each 20mg·L -1 In the mixed solution, use 0.1mol·L -1 HNO 3 or 0.1mol·L -1 Adjust the pH value to about 6 with NaOH, at a speed of 200r min -1 , adsorbed in a constant temperature water bath magnetic stirrer at a temperature of 25°C for 90min, and filtered the supernatant. Referring to "Water and Wastewater Monitoring and Analysis Methods (Fourth Edition)", the filtrate was detected and analyzed by flame atomic absorption spectrophotometry for the concentration of heavy metal ions, and it was found that Cu 2+ , Pb 2+ , Zn 2+ 、Cd 2+ The residual concentrations of heavy metal ions are: 0.22, 0.88, 1.97, 0.07mg L -1 , have reached the national "Comprehensive Wastewater Discharge Standard" (GB8978-1996).

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Abstract

The invention discloses a heavy metal ion adsorbent and a preparation and application method thereof. Spent grain is adopted as material, mercaptoacetic acid is chosen as reagent for mercaptolation, NaHSO4.H2O is adopted as catalyst, N,N-dimethylformamide is adopted as reaction medium, mercaptolation is carried out, Na2S.9H2O is then added as reducing agent, aqueous ethanol is adopted as reaction medium, reduction reaction is carried out, and thereby the adsorbent is produced. Compared with the conventional sulfhydryl cotton preparation method, the method has the absolute advantages of high efficiency and quickness. The mercaptolated spend grain is rich in ester functional groups and mercapto functional groups, and can be used for the treatment of heavy metal wastewater. When the mercaptolated spend grain is used for treating mixed heavy metal wastewater containing Cu2 plus, Pb2 plus, Zn2 plus and Cd2 plus ions, effluent can meet National Integrated Wastewater Discharge Standard (GB8978-1996). The mercaptolated spend grain can be reused for at least three times, and therefore has a good application value.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to an adsorbent for heavy metal ions and a preparation and application method thereof. Background technique [0002] With the rapid development of modern industry, the discharge of wastewater has increased dramatically. The 2008 China Environmental Status Bulletin shows that surface water pollution is still serious across the country. Among the 409 sections of 200 rivers in the seven major water systems of the Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River and Liaohe River, the proportions of sections with water quality of I-III, IV-V and worse than V were 55.0%, 24.2% and 20.8%. In 2008, the total discharge of wastewater in the country was 57.17 billion tons, an increase of 2.7% over the previous year. Among them, the discharge of industrial wastewater was 24.17 billion tons, accounting for 42.3% of the total discharge of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 柴立元李青竹王庆伟杨志辉闵小波王云燕王海鹰
Owner CENT SOUTH UNIV
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