Amino-terminated modified cellulose, and preparation method and application thereof

A technology of amino-terminated cellulose, which is applied in the field of amino-terminated cellulose and its preparation, can solve the problems of single adsorption type, difficult adjustment, and great influence on adsorption effect, so as to reduce production cost, increase added value, and source broad effect

Inactive Publication Date: 2014-02-05
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The adsorption effect is greatly affected by the pH of the environment. Overacid or overalkali will cause the reduction of the removal performance of the adsorbent (including amino-terminated hyperbranched compounds) on heavy metal ions.
In practical applications, the pH of the solution is a relatively random factor, which is not easy to adjust, thus affecting the removal effect of adsorbents (including amino-terminated hyperbranched compounds) on heavy metals.
[0011] 2. The "desorption" effect after adsorption is not ideal
That is, the recovery and reuse rate of adsorbent is low
[0012] 3. Single adsorption type
In actual production, wastewater often contains both positively charged heavy metal cations and negatively charged harmful organic wastes; however, most of the existing adsorbents (including amino-terminated hyperbranched compounds) can only treat one kind of charged toxic substances , such as anionic adsorbents that can only adsorb heavy metal cations, and cationic adsorbents that can only adsorb harmful organic substances

Method used

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  • Amino-terminated modified cellulose, and preparation method and application thereof
  • Amino-terminated modified cellulose, and preparation method and application thereof
  • Amino-terminated modified cellulose, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The method for preparing the amino-terminated modified cellulose, its processing steps are:

[0065] (1) Raw material pretreatment: the bagasse raw material washed and dried to a constant weight in 3% (Wt%) lithium hydroxide concentrated alkali solution; the bath ratio of the concentrated alkali and bagasse raw material is 5 (V / W)) Soaked in more than 10 hours, washing, suction filtration, drying to obtain alkali bagasse fiber;

[0066] (2) Preparation of dialdehyde bagasse cellulose: Alkali bagasse fiber and strong oxidant (KIO 4 ) Oxidation reaction occurs under dark conditions to obtain dialdehyde bagasse cellulose;

[0067] (3) Synthesis of amino-terminated hyperbranched polymers: using methyl methacrylate and ethylenediamine as raw materials, under the condition of avoiding light and oxygen in methanol (introducing N 2 ) stirring and polymerizing to obtain an amino-terminated hyperbranched polymer;

[0068] (4) Synthesis of dialdehyde cellulose grafted with ami...

Embodiment 2

[0077]The method for preparing the amino-terminated modified cellulose, its processing steps are:

[0078] (1) Raw material pretreatment: the bagasse raw material that has been washed and dried to constant weight is placed in a 5% (Wt%) sodium hydroxide concentrated alkali solution; the bath ratio of the concentrated alkali to the bagasse raw material is 8 (V / W )) for more than 15 hours, washed, filtered and dried to obtain alkali bagasse fiber;

[0079] (2) Preparation of dialdehyde bagasse cellulose: Alkaline bagasse fiber and strong oxidant H 5 IO 6 Oxidation reaction occurs under dark conditions to obtain dialdehyde bagasse cellulose;

[0080] (3) Synthesis of amino-terminated hyperbranched polymers: using methyl methacrylate and ethylenediamine as raw materials, stirring in ethanol under light-proof and oxygen-proof conditions (introducing helium gas during the reaction) to undergo polymerization reaction to obtain end-amino-terminated hyperbranched polymers. Amino hyp...

Embodiment 3

[0086] The method for preparing the amino-terminated modified cellulose, its processing steps are:

[0087] (1) Raw material pretreatment: Put the bagasse raw material washed and dried to constant weight in 10% (Wt%) potassium hydroxide concentrated alkali solution; the bath ratio of the concentrated alkali and bagasse raw material is 10 (V / W )) for more than 20 hours, washed, filtered and dried to obtain alkali bagasse fiber;

[0088] (2) Preparation of dialdehyde bagasse cellulose: Alkaline bagasse fibers and a strong oxidant (NaIO 4 ) Oxidation reaction occurs under dark conditions to obtain dialdehyde bagasse cellulose;

[0089] (3) Synthesis of amino-terminated hyperbranched polymers: using methyl methacrylate and ethylenediamine as raw materials, stirring and polymerizing in propanol under the condition of avoiding light and oxygen (neon gas is introduced into the reaction) to obtain Amino-terminated hyperbranched polymers;

[0090] (4) Synthesis of dialdehyde cellulo...

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Abstract

The invention discloses amino-terminated modified cellulose, and a preparation method and application thereof. The method comprises the following steps: firstly, soaking a bagasse material which is cleaned and dried into constant weight in concentrated alkaline for over 10 hours; washing, carrying out suction filtering and drying to obtain alkaline bagasse fibers; then carrying out an oxidation reaction on the alkaline bagasse fibers and a strong oxidant in a dark condition, so as to obtain dialdehyde bagasse cellulose; with methyl methacrylate and ethanediamine as raw materials, stirring in an organic solvent under dark and oxygen-isolated conditions to carry out a polymerization reaction, so as to obtain an amino-terminated hyperbranched polymer; and finally carrying out a reflux reaction after dissolving the dialdehyde bagasse cellulose and the amino-terminated hyperbranched polymer into the organic solvent, so as to obtain the amino-terminated hyperbranched grafted dialdehyde cellulose. The modified cellulose not only has good adsorptive property on heavy metal ions in a wastewater solution, but also is easy to separate after adsorption. Thus, the amino-terminated modified cellulose has the water purification effects of simple method and low cost.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to an amino-terminated modified cellulose and a preparation method and application thereof. Background technique [0002] Heavy metals are potentially harmful persistent pollutants. Because heavy metal ions are difficult to degrade and accumulate in fish and crop tissues, they can cause harm to humans through the food chain. In terms of heavy metal wastewater treatment, it is of great significance to carry out research on the development and application of agents that are non-polluting to the environment or agents that can self-treat the environment in a short period of time, and the development and application of new non-toxic and harmless water treatment agents. [0003] At present, in the treatment of heavy metal wastewater, the heavy metals in the ionic state are mainly adsorbed by adsorbents or adsorbent materials, and then separated and removed by sedimenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G12/06C08B1/08C08B15/02C08G73/00C02F1/28C02F1/62C02F101/20
Inventor 夏璐张博涵胡伊旭龚铸李国磊
Owner GUANGXI UNIV FOR NATITIES
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