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Preparation of PEI-grafted gelatin sponge and application of PEI-grafted gelatin sponge in heavy metal sewage treatment

A technology of gelatin sponge and heavy metals, applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of limited adsorption capacity of gelatin sponge, reduction of active groups, unfavorable heavy metal adsorption treatment, etc. problems, to achieve the effect of prolonging the adsorption exchange time, low preparation cost and short reaction time

Inactive Publication Date: 2016-07-13
WUHAN POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the self-crosslinking of amino groups on its surface during the preparation process, the active groups that can combine with heavy metals are greatly reduced, so that the adsorption capacity of gelatin sponge itself is limited, which is not conducive to the adsorption treatment of heavy metals in wastewater.

Method used

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  • Preparation of PEI-grafted gelatin sponge and application of PEI-grafted gelatin sponge in heavy metal sewage treatment
  • Preparation of PEI-grafted gelatin sponge and application of PEI-grafted gelatin sponge in heavy metal sewage treatment
  • Preparation of PEI-grafted gelatin sponge and application of PEI-grafted gelatin sponge in heavy metal sewage treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of carboxylated gelatin sponge

[0039] 2 mmol of 3,3'-dithiodipropionic acid was dissolved in 8 mL of N,N-dimethylformamide, followed by 2 mmol of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide ( EDC) was dissolved in 1 mL of water, and the above two solutions were mixed and shaken at 60 °C for 1 h. Then the mixed solution was slowly added dropwise to 10 mL of water with a pH of 5, and a piece of gelatin sponge with a mass of 20 mg was added to drive away the air bubbles in the sponge, and the reaction was shaken in a shaker at 60°C for 24 hours. Finally, the reacted gelatin sponge was taken out with tweezers, washed twice with water, placed on filter paper to absorb excess water, and carboxylated modified gelatin sponge was obtained.

[0040] (2) Preparation of PEI-grafted gelatin sponge

[0041]Dissolve 1mmol PEI in 20mL water, then add 1mmol 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) and 1mmol N-hydroxysuccinimide (NHS) respectively, and mi...

Embodiment 2

[0044] (1) Preparation of carboxylated gelatin sponge

[0045] Dissolve 1 mmol of 3,3'-dithiodipropionic acid in 5 mL of N,N-dimethylformamide, followed by 1 mmol of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide ( EDC) was dissolved in 1 mL of water, and the above two solutions were mixed and shaken at 40 °C for 1 h. Then the mixed solution was slowly added dropwise to 10 mL of water with a pH of 5, and a piece of gelatin sponge with a mass of 20 mg was added to drive away the air bubbles in the sponge, and the reaction was shaken in a shaker at 40°C for 24 hours. Finally, the reacted gelatin sponge was taken out with tweezers, rinsed twice with water, placed on filter paper to absorb excess water, and carboxylated modified gelatin sponge was obtained.

[0046] (2) Preparation of PEI-grafted gelatin sponge

[0047] Dissolve 0.5 mmol PEI in 20 mL water, then add 0.5 mmol 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (EDC) and 0.5 mmol N-hydroxysuccinimide (NHS), respectively,...

Embodiment 3

[0049] 20 mg of gelatin sponge and PEI-grafted gelatin sponge prepared in Example 2 were added to 20 mL of waste water containing lead and cadmium, respectively, and the concentrations of lead and cadmium were respectively 0-50 μg / mL. After shaking for 2 hours, use the national standard method to measure the content of lead and cadmium in the wastewater, and then calculate the adsorption capacity of the gelatin sponge material. The result is as image 3 As shown, the adsorption capacities of gelatin sponge to Pb(Ⅱ) and Cd(Ⅱ) were 9.35mg / g and 9.75mg / g respectively; while the adsorption capacities of PEI-grafted gelatin sponge to Pb(Ⅱ) and Cd(Ⅱ) were respectively 66.1 mg / g and 65.2 mg / g. The above results show that the gelatin sponge modified by PEI surface grafting greatly increases the number of amino groups on the surface of the gelatin sponge, and exhibits excellent adsorption effect on heavy metals. Therefore, the method of the present invention can be used to prepare PE...

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Abstract

The invention discloses preparation of a PEI-grafted gelatin sponge and application of the PEI-grafted gelatin sponge in heavy metal sewage treatment, and belongs to the field of ecological environment safety.The PEI-grafted gelatin sponge is prepared through the steps that carboxylation modification is performed on a gelatin sponge to completely convert amino groups on the surface of the gelatin sponge into the carboxyl groups; the gelatin sponge is modified with PEI and carboxyl groups through the acting force among ions to prepare the PEI-grafted gelatin sponge.The prepared PEI-grafted gelatin sponge can be applied to heavy metal-containing sewage treatment and also can be used for preparing a heavy metal absorbent.The adopted preparation method is mild in reaction, short in reaction time, poisonless in used material, low in preparation cost, high in safety and simple in after-treatment; the prepared PEI-grafted gelatin sponge has the advantages that the adsorption capacity on the heavy metal ions is high, the water absorption capacity of the gelatin sponge is kept, most sewage can be retained when the PEI-grafted gelatin sponge is applied to sewage irrigation, the absorption and exchange time of a sponge material and heavy metal is prolonged, and the purification effect on the heavy metal is improved.

Description

technical field [0001] The invention relates to the field of ecological environment safety such as water and soil, in particular to the preparation of a PEI grafted gelatin sponge and its application in heavy metal sewage treatment. Background technique [0002] In recent years, with the shortage of water resources and increasing soil pollution, sewage irrigation has become an unavoidable practical problem. Various pollutants in sewage, especially heavy metal ions, have a bad impact on crops and soil environment. Lead (Pb) and cadmium (Cd) are two heavy metals that are easily accumulated in crops and pose a great threat to human health. [0003] In the "Water Quality Standards for Farmland Irrigation" promulgated and implemented in my country, stricter requirements are put forward for sewage irrigation, and the use of sewage to irrigate raw vegetables and fruits is strictly prohibited; for water crops, dry crops and vegetables, sewage treatment must meet the standards befor...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08J9/40B01J20/26B01J20/30C02F1/28C02F1/62C08L89/00C02F101/20
CPCB01J20/265C02F1/285C02F1/62C02F2101/20C08J9/40C08J9/42C08J2389/00
Inventor 方敏宫智勇吴永宁
Owner WUHAN POLYTECHNIC UNIVERSITY
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