Preparation method of PVA (Polyvinyl Acetate)/PEI (Polyethylenimine)-T nanofiber membrane capable of specifically adsorbing mercury ions

A nanofiber membrane and mercury adsorption technology, which is applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high cost and poor stability of DNA synthesis, and achieve high reuse rate and easy Operation, the effect of high grafting amount

Inactive Publication Date: 2013-05-22
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of DNA synthesis is high and the stability is poor, so it is necessary to further develop efficient, stable and cheap Hg 2+ Adsorbent Materials and Probes

Method used

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  • Preparation method of PVA (Polyvinyl Acetate)/PEI (Polyethylenimine)-T nanofiber membrane capable of specifically adsorbing mercury ions
  • Preparation method of PVA (Polyvinyl Acetate)/PEI (Polyethylenimine)-T nanofiber membrane capable of specifically adsorbing mercury ions
  • Preparation method of PVA (Polyvinyl Acetate)/PEI (Polyethylenimine)-T nanofiber membrane capable of specifically adsorbing mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 0.5g of PEI into a 25mL clean vial, add 20mL of deionized water, stir rapidly on a magnetic stirrer for 1h until the PEI is completely dissolved, and set aside. In another vial, weigh N:T (N is the number of moles of primary ammonia on a certain mass of PEI, and T is the number of moles of thymine) with a ratio of 1:1 thymine-1-acetic acid in a vial, add 20 mL to Ionized water is slightly heated (40-45°C) and stirred to dissolve, then add five times the equivalent of EDC of thymine-1-acetic acid, and activate it under rapid stirring. After 3h, the uniformly stirred PEI solution was added to the mixed solution, and the vial was washed with 1mL of deionized water for 3 times and then injected into the reaction solution together, and reacted at room temperature for 24h under rapid stirring. It can be seen that the reaction solution changed from colorless to turned to light yellow, visually verifying the formation of the reaction product. After the reaction was compl...

Embodiment 2

[0045] Take 8.141g of PVA powder and slowly add 60mL of deionized water, stir slowly for about 30min until the PVA is completely swollen, then place it on a magnetic stirrer and stir in an 80°C water bath for 3h, and make a PVA aqueous solution with a mass percentage concentration of 12%, after cooling stand-by. A certain mass of PEI-T was weighed and mixed with the above PVA aqueous solution to prepare a 10mL mixed solution with a total mass concentration of 12%, wherein the mass ratio of PVA / PEI-T was 3:1. Electrospinning was performed on the above mixed solution. The spinning process conditions are set as follows: the flow rate is 0.3mL / h, the voltage is 18.6KV, and the receiving distance is 25cm. The prepared nanofibers are finally deposited on the aluminum foil in the form of nanofiber films, and the fiber films are dried in a vacuum oven for 24-28 hours, and then stored in a desiccator for future use. Take the fiber membrane and cover it on a petri dish filled with 20m...

Embodiment 3

[0049] Using Hg(NO 3 ) 2 for Hg 2+ Specific adsorption of Hg on electrospun PVA / PEI-T nanofibrous membrane 2+ ability to test. Configure Hg 2+ Concentration of 20mg / L pH buffer (20mM KH 2 PO 4 / NaOH, pH=7) 40mL, 80mg of electrospun PVA / PEI-T fiber membrane was added at room temperature, 0.5mL was sampled at the predetermined time point, and then diluted to 2mL for ICP-AES (Leeman Prodigy, USA) characterization to detect the Hg in solution at time 2+ content. The data show that within 60 minutes, the Hg 2+ The concentration is basically unchanged, and after adding the same mass of PVA / PEI-T (N:T=1:1) fiber membrane, we see that Hg 2+ The adsorption capacity increased significantly, reaching 70.9% at the end of the experiment, which shows that the grafted thymine significantly enhanced the PVA / PEI-T fiber membrane to Hg 2+ The adsorption efficiency ( Figure 5 a). After the first adsorption experiment, the fiber membrane was soaked and washed with 30 mL of 1 M HCl so...

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Abstract

The invention relates to a preparation method of a PVA (Polyvinyl Acetate) / PEI (Polyethylenimine)-T nanofiber membrane capable of specifically adsorbing mercury ions. The preparation method comprises the following steps of: (1) dissolving thymine-1-acetic acid into water, adding EDC (Ethylene Dichloride), stirring for 2-5hours to obtain a solution, then adding a PEI solution, reacting through stirring, and carrying out dialyzing and freeze drying to obtain PEI-T; and (2) mixing a PVA aqueous solution and the PEI-T to obtain a polyvinyl alcohol PVA / PEI-T solution, and carrying out electrostatic spinning, glutaraldehyde steam crosslinking, rinsing and vacuum drying to obtain the PVA / PEI-T nanofiber membrane. A using method of the PVA / PEI-T nanofiber membrane comprises the following steps of: adding a pH buffer solution of mercuric salts into the PVA / PEI-T nanofiber membrane, carrying out adsorption under the condition of room temperature, sampling, and testing the variation of the concentration of the mercury ions. According to the preparation method disclosed by the invention, the preparation process is simple and is easy to operate, the stability of fiber materials water is good, the fiber materials water is convenient to recover and is high in repeated utilization ratio, and the mercury ions have high specific adsorption.

Description

technical field [0001] The invention belongs to the field of preparation of mercury ion adsorbing substances, in particular to a preparation method of a PVA / PEI-T nanofiber membrane that specifically adsorbs mercury ions. Background technique [0002] In recent years, the prevention and control of mercury pollution has increasingly become a hot environmental issue of global concern. Mercury is persistent, easy to migrate, highly bioaccumulative, and highly toxic. Any form of mercury in the environment can be converted into highly toxic methylmercury under certain conditions. Methylmercury can cause irreparable damage to the central nervous system of the human body. Mercury electrolysis production of caustic soda, mining and smelting of mercury-containing ores and gold mines, coal burning, hospitals, battery factories, calcium carbide acetylene production of vinyl chloride, instrumentation and other production industries or departments will emit mercury pollution to the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08L39/04C08L79/02C08G73/04C02F1/28C02F1/62
Inventor 沈明武黄云鹏胡登脉史向阳
Owner DONGHUA UNIV
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