Method for preparing heavy metal adsorbent

An adsorbent and heavy metal technology, which is applied in the field of heavy metal adsorbent preparation, can solve the problems of difficulty in increasing the grafting rate of cellulose molecules and low accessibility of cellulose, so as to increase economic added value, increase reaction grafting rate, The effect of enhancing chemical reactivity

Inactive Publication Date: 2015-04-01
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In natural cellulose, there are about 70% crystalline structure, which makes the accessibility of cellulose lower, making it difficult to increase the grafting rate on cellulose molecules

Method used

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  • Method for preparing heavy metal adsorbent

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Experimental program
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Effect test

Embodiment 1

[0019] A kind of preparation method of heavy metal adsorbent, carries out according to the following steps:

[0020] 1. Preparation of bagasse cellulose:

[0021] After crushing the bagasse, sieve it with a 100-mesh sieve to keep the small parts, add 80ml of 15% NaOH to the bagasse, treat at 120°C for 0.5h, wash with distilled water until neutral, and dry to obtain bagasse cellulose.

[0022] 2. Activation of bagasse cellulose:

[0023] Take 1.0 g of the absolute-dried bagasse cellulose obtained in step 1 and place it in a three-necked flask, add 15 ml of distilled water, and react for 30 minutes under ultrasonic conditions with a power of 150 W to obtain an activated cellulose suspension.

[0024] 3. Graft copolymerization of bagasse cellulose and acrylic acid:

[0025] Take the bagasse cellulose suspension obtained in step 2, add neutralized acrylic acid (sodium hydroxide:acrylic acid mass ratio is 2:3); add initiator ammonium persulfate and N,N'-methylenebisacrylamide in ...

Embodiment 2

[0029] A kind of preparation method of heavy metal adsorbent, carries out according to the following steps:

[0030] 1. Preparation of bagasse cellulose:

[0031] After crushing the bagasse, sieve it with a 100-mesh sieve to keep the fine parts, add 100ml of 20% NaOH to the bagasse, treat at 120°C for 1.0h, wash with distilled water until neutral, and dry to obtain bagasse cellulose.

[0032] 2. Activation of bagasse cellulose:

[0033] Take 1.0 g of the absolute-dried bagasse cellulose obtained in step 1 and place it in a three-necked flask, add 18 ml of distilled water, and react for 30 minutes under ultrasonic conditions with a power of 300 W to obtain an activated cellulose suspension.

[0034] 3. Graft copolymerization of bagasse cellulose and acrylic acid:

[0035] Take the bagasse cellulose suspension obtained in step 2, add neutralized acrylic acid (sodium hydroxide:acrylic acid mass ratio is 2:5); add initiator potassium persulfate and N,N'-methylenebisacrylamide in...

Embodiment 3

[0039] A kind of preparation method of heavy metal adsorbent, carries out according to the following steps:

[0040] 1. Preparation of bagasse cellulose:

[0041] After crushing the bagasse, sieve it with a 100-mesh sieve to keep the fine parts, add 120ml of 20% NaOH to the bagasse, treat at 120°C for 1.0h, wash with distilled water until neutral, and dry to obtain bagasse cellulose.

[0042] 2. Activation of bagasse cellulose:

[0043] Take 1.0 g of the absolute-dried bagasse cellulose obtained in step 1 and place it in a three-necked flask, add 18 ml of distilled water, and react for 30 minutes under ultrasonic conditions with a power of 400 W to obtain an activated cellulose suspension.

[0044] 3. Graft copolymerization of bagasse cellulose and acrylic acid:

[0045] Take the bagasse cellulose suspension obtained in step 2, add neutralized acrylic acid (sodium hydroxide: acrylic acid mass ratio is 2:7); ​​add initiator ammonium persulfate and N,N'-methylenebisacrylamide ...

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Abstract

The invention discloses a method for preparing a heavy metal adsorbent. The method comprises the following steps: firstly carrying out alkali treatment on bagasse to prepare bagasse cellulose; carrying out ultrasonic activation on the bagasse cellulose, and sequentially adding an initiating agent, N,N'-methylene bisacrylamide and acrylic acid for grafting reaction to prepare a graft copolymerization product, wherein the N,N'-methylene bisacrylamide and the acrylic acid are neutralized by an NaOH solution; sequentially washing by using distilled water and absolute ethyl alcohol, drying and crushing to obtain a crude product of the heavy metal adsorbent; and carrying out acetone extraction to obtain the purified heavy metal adsorbent. Compared with the prior art, the preparation method disclosed by the invention has the beneficial effects of crushing and removing the outer layer of a cell wall of a bagasse fiber by carrying out ultrasonic activating treatment on the bagasse fiber, so that the chemical reaction activity of the bagasse fiber is enhanced, the grafting ratio of the grafting reaction is increased and the adsorption property of a product is improved.

Description

technical field [0001] The invention relates to the field of preparation of a heavy metal adsorbent, in particular to a preparation method of a heavy metal adsorbent. Background technique [0002] The discharge of industrial wastewater containing heavy metal ions has caused serious pollution to the environment and a threat to people's health. Therefore, it is very important to remove heavy metal ions in wastewater. Cellulose is cheap, easy to obtain, and environmentally friendly. Therefore, cellulose-based heavy metal ion adsorption materials have attracted the attention of researchers. [0003] In natural cellulose, about 70% of the crystalline structure makes the accessibility of cellulose lower, making it difficult to increase the grafting rate on cellulose molecules. Ultrasound can produce mechanical action, thermal action and cavitation action. When propagating in liquid, it can generate huge pressure, break and remove the outer layer of fiber cell wall, enhance the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
CPCB01J20/264C02F1/285
Inventor 黄琳娟陆登俊刘桂云李营营桑显葵
Owner GUANGXI UNIV
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