Method for preparing heavy metal ion adsorbents from grafted modified cotton fibers
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A technology of heavy metal ion and graft modification, which is applied in fiber treatment, plant fiber, chemical instruments and methods, etc., can solve the problems of water pollution and achieve uniform distribution of adsorption sites
Inactive Publication Date: 2018-12-25
王韶华
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[0004] The purpose of the present invention is to address the existing problems and provide a method for preparing a heavy metal ion adsorbent by grafting modified cotton fibers. The adsorbent produced according to the method can adsorb various heavy metal ions and solve the problem of water pollution
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Embodiment 1
[0022] A method for preparing heavy metal ion adsorbent with grafted modified cotton fiber, is characterized in that, comprises the steps:
[0023] (1) Preparation of oxidized cotton fiber:
[0024] Soak 10 parts of cotton fiber in a sodium hydroxide solution with a concentration of 20g / L at 94-96°C for 1 hour at a bath ratio of 1:50, filter, wash, and dry, then add 18% of the cotton fiber at a bath ratio of 1:30 Soak in sodium hydroxide solution for 1 hour, wash until neutral, suction filter and dry, place in sodium periodate solution at a bath ratio of 1:30, oxidize at 70-73°C for 2 hours, then put glycerine After soaking in the alcohol solution for 20 hours, wash and dry to obtain oxidized cotton fibers, which are divided into two parts and set aside;
[0025] (2) Oxidized cotton fiber grafted with tetraethylenepentamine:
[0026] Put the oxidized cotton fiber obtained in one part (1) in the tetraethylenepentamine solution at a bath ratio of 1:50, graft reaction at 70-73°...
Embodiment 2
[0035] A method for preparing heavy metal ion adsorbent with grafted modified cotton fiber, is characterized in that, comprises the steps:
[0036] (1) Preparation of oxidized cotton fiber:
[0037] Soak 20 parts of cotton fibers in a sodium hydroxide solution with a concentration of 20g / L at 94-96°C for 2 hours at a bath ratio of 1:50, filter, wash, and dry, and then soak them in 18% sodium hydroxide solution at a bath ratio of 1:30. Soak in sodium hydroxide solution for 2 hours, wash until neutral, suction filter and dry, place in sodium periodate solution at a bath ratio of 1:30, oxidize at 70-73°C for 3 hours, then put glycerine After soaking in alcohol solution for 25 hours, wash and dry to obtain oxidized cotton fibers, which are equally divided into two parts for use;
[0038] (2) Oxidized cotton fiber grafted with tetraethylenepentamine:
[0039] Put the oxidized cotton fibers obtained in one part (1) in the tetraethylenepentamine solution at a bath ratio of 1:50, gr...
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Abstract
The invention discloses a method for preparing heavy metal ion adsorbents from grafted modified cotton fibers. The method includes placing oxidized cotton fibers in tetraethylenepentamine solution, carrying out heating grafting reaction, sufficiently washing reaction products by water and then carrying out freeze-drying on the reaction products to obtain tetraethylenepentamine grafted modified cotton fibers; sequentially adding NaOH aqueous solution, absolute ethyl alcohol and epichlorohydrin into oxidized cotton fibers, carrying out heating grafting reaction in water bath, then washing reaction products by water until the reaction products are neutral, washing the reaction products by acetone and drying the reaction products to obtain epoxy cotton fibers; sequentially adding deionized water, Na2CO3 and diethylenetriamine into the obtained epoxy cotton fibers, carrying out grafting reaction under nitrogen protection conditions, washing reaction products by water until the reaction products are neutral, and drying the reaction products to obtain ion exchange fibers; uniformly mixing the ion exchange fibers and the obtained tetraethylenepentamine grafted modified cotton fibers with one another to obtain the heavy metal ion adsorbents.
Description
technical field [0001] The invention belongs to the field of cotton fiber application, and in particular relates to a method for preparing a heavy metal ion adsorbent by grafting modified cotton fiber. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. After entering the human body through food and water, it will strongly interact with proteins and various enzymes, making them inactive; it may also be present in some organs of the human body. Enrichment, causing acute poisoning, subacute poisoning or chronic poisoning, etc., will cause great harm to the human body. Therefore, the problem of heavy metal pollution control has been paid more and more attention. [0003] Heavy metal pollution in water has become a global environmental problem. Heavy metals in the environment cannot be degraded. Most heavy metals exist in the form of ions in water bodies. They are colorless and odorless. After enterin...
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Application Information
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