Preparation and application of a heavy metal ion adsorption fiber with wide pH range

A technology for absorbing heavy metal ions and fibers, applied in ion exchange, fiber treatment, cation exchange, etc., can solve the problems of slow adsorption rate, slow adsorption and desorption speed, and inapplicability, and achieve easy recycling, wide application prospects, and adsorption fast effect

Active Publication Date: 2016-01-13
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the pH has a great influence on the adsorption in the prior art, the adsorption rate is slow, the porous structure of the resin leads to slow adsorption and desorption rates, the granular shape is not suitable for use in open waters, and the natural fibers have poor corrosion resistance and low strength. The technical problem to be solved by the invention is to provide the preparation and application of a heavy metal ion adsorption fiber with a wide pH range, which is characterized in that compared with the existing ion exchange resin, when the fiber adsorbs heavy metal ions, the pH has almost no effect on the adsorption. Influence, that is, the use range of pH is wide; its adsorption speed is fast, and the adsorption equilibrium can be reached within 3 minutes; the fiber can be made into various shapes, easy to use, and easy to recycle, so it is used in the treatment of metal smelting and petrochemical wastewater. It has wide application prospects, especially for the adsorption of heavy metal ions in open water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A certain mass of polypropylene fiber is added to a solution of acrylic acid ethanol / water (volume ratio 1:5) with a volume fraction of 35%, ferrous ammonium sulfate with a mass fraction of 2.0%, and concentrated sulfuric acid with a volume fraction of 0.5%. Nitrogen was passed for 10 minutes, irradiated with a high-energy electron beam according to the irradiation dose of 60KGy, taken out and washed, and the polypropylene fiber grafted with acrylic acid with a grafting rate of 68.86% was obtained, and then added to the fiber with 1.5mol / l hydrogen Sodium oxide was dissolved in a solution of 5-aminosalicylic acid with a mass fraction of 10%, heated at 85° C. for 4 hours, taken out and washed to obtain a heavy metal ion adsorption fiber with a 5-aminosalicylic acid content of 1.09 mmol / g.

[0033]Take about 0.1g of the above-mentioned heavy metal ion adsorption fiber, under the condition of pH=2, the static adsorption volume is 100ml and the concentration is 10mg / l Pb(II)...

Embodiment 2

[0036] A certain mass of polypropylene fiber is added to acrylic acid ethanol / water (volume ratio 1:4) solution with a volume fraction of 40%, ferrous ammonium sulfate with a mass fraction of 2.5%, and concentrated sulfuric acid with a volume fraction of 1.5%. Nitrogen for 10 minutes, irradiated with a high-energy electron beam according to the irradiation dose of 100KGy, took it out and washed it, and obtained a polypropylene fiber grafted with acrylic acid with a grafting rate of 72.39%. Sodium-dissolved 20% 5-aminosalicylic acid solution was heated at 110° C. for 5 hours, taken out and washed to obtain a heavy metal ion adsorption fiber with a 5-aminosalicylic acid content of 1.66 mmol / g;

[0037] Take about 0.1g of the above-mentioned heavy metal ion adsorption fiber, under the condition of pH=5, under the magnetic stirrer stirring, the static adsorption volume is 150ml, and the removal rate of Pb(II) and Cd(II) with a concentration of 10mg / l are respectively 96.43% and 99...

Embodiment 3

[0040] A certain mass of polypropylene fiber is added to a solution of 40% acrylic acid ethanol / water (volume ratio: 1:3) by volume, 2% ammonium ferrous sulfate is added, and 0.6% concentrated sulfuric acid is added by volume. Nitrogen was blown for 10 minutes, irradiated with a high-energy electron beam according to the irradiation dose of 70KGy, taken out and washed, and a polypropylene fiber grafted with acrylic acid was obtained with a grafting rate of 77.36%. Then it is added to the solution of 5-aminosalicylic acid with a mass fraction of 25% dissolved in 2mol / l sodium hydroxide, heated at 92°C for 6h, taken out and washed to obtain the content of 5-aminosalicylic acid 1.24mmol / g heavy metal ion adsorption fiber;

[0041] Take about 0.1g of the above-mentioned heavy metal ion adsorption fiber, under the condition of pH=9, the static adsorption volume is 100ml and the concentration is 50mg / l Pb(II) and Cd(II) under the condition of magnetic stirrer stirring, the removal r...

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Abstract

The invention discloses preparation and application of a heavy metal ion adsorption fiber with a wide pH application range. The method comprises the following steps: soaking a polypropylene fiber in a solvent containing a double-bond carboxylic acid monomer, a polymerization inhibitor and a catalyst, introducing nitrogen and swelling; irradiating through high-power electron beams, taking out homopolymer of which the fiber surface is cleaned, and drying to obtain a carboxylic-acid-grafted polypropylene fiber; and putting the polypropylene fiber into a sodium hydroxide solution in which 5-aminosalicylic acid is dissolved, introducing nitrogen for protection, heating for 2-10 hours, taking out and cleaning, thus obtaining a 5-aminosalicylic acid modified heavy metal ion adsorption fiber. The pH hardly has influence on heavy metal ions adsorbed by the fiber, so that wide pH application range can be realized. The adsorption speed is high, and the adsorption equilibrium can be achieved within 3 minutes; the fiber can be made into various shapes, is convenient to use and recycle, has wide application prospects in treatment of wastewater in metal smelting and petrochemical engineering and is particularly suitable for adsorption of the heavy metal ions in open water.

Description

technical field [0001] The invention belongs to the field of functional materials and environmental engineering, and is particularly suitable for the preparation of an adsorption material for adsorbing heavy metal ions in the pH range of 1-12 and the rapid adsorption of heavy metal ions in water. Background technique [0002] In recent years, with the continuous deepening of global industrialization and the continuous development of social economy, heavy metals have been used more and more widely, and their types and quantities have also increased exponentially. Heavy metals neither biodegrade nor pyrolyze in the environment, but enter the human body through the food chain and accumulate in the organs of the human body, leading to chronic poisoning and endangering human health. Lead has toxic effects on the nervous system, digestive system, and hematopoietic system. Cadmium can easily cause diseases such as osteoporosis, bone pain, and bone atrophy and deformation, and has "...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28B01J39/20B01J39/18C02F1/42C02F1/62D06M14/28D06M14/30D06M13/368G01N33/44G01N33/00
Inventor 魏俊富李永花孔志云赵孔银刘娜娜张越
Owner TIANJIN POLYTECHNIC UNIV
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