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A method for preparing heavy metal ion adsorbents from maleylated wood fibers at room temperature

A technology of heavy metal ions and wood fibers, applied in chemical instruments and methods, and other chemical processes, can solve the problems of high equipment and energy requirements, no research reports, single wood fibers, etc., and achieve uniform and stable product properties. The effect of simplifying the process is smooth and the reaction is easy to carry out

Active Publication Date: 2015-12-09
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the biomass-based heavy metal ion adsorbents use a single component of wood fiber, which needs to be separated from the wood fiber in advance, and the preparation process uses a relatively high temperature, which requires high equipment and energy.
[0005] At present, there is no relevant research report on the preparation of heavy metal ion adsorbents by homogeneous modification of lignocellulosic fibers at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The wood fiber of present embodiment adopts bagasse, and its specific process is as follows:

[0029] (1) Ball milling the dried bagasse to obtain bagasse powder;

[0030] (2) Add 100 mg of bagasse powder into 3 mL of dimethyl sulfoxide / 1-methylimidazole (DMSO / NMI, the volume ratio of DMSO and NMI is 2:1) solvent system, and stir at room temperature for 3 hours to obtain a bagasse solution;

[0031] (3) Add 50 mg of maleic anhydride to the bagasse solution, and stir for 3 hours at room temperature in a dry airtight container isolated from moisture, so that the maleic anhydride and bagasse react in the solvent system;

[0032] (4) After the reaction, pour into 90mL isopropanol, stir thoroughly for 30min to precipitate the product, filter through a 0.2μm membrane, collect and wash with isopropanol, freeze-dry at -40°C to obtain bagasse derivatives for heavy metal ion adsorption Dose 125.4mg.

[0033] The prepared heavy metal ion adsorbent was used for heavy metal adsorp...

Embodiment 2

[0035] The lignocellulosic fiber of present embodiment adopts rice straw, and its specific process is as follows:

[0036] (1) Ball milling the dried rice straw to obtain rice straw powder;

[0037] (2) Add 100 mg of rice straw powder to 2 mL of dimethyl sulfoxide / 1-methylimidazole (DMSO / NMI, the volume ratio of DMSO and NMI is 2:1) solvent system, and stir at room temperature for 8 hours to obtain a straw solution;

[0038] (3) Add 600 mg of maleic anhydride to the straw solution, and stir for 30 minutes at room temperature in a dry airtight container isolated from moisture, so that the maleic anhydride and the straw react in the solvent system;

[0039] (4) After the reaction, pour it into 100mL ethanol, stir thoroughly for 30min to precipitate the product, filter through a 0.2μm membrane, collect and wash with ethanol, freeze-dry at -40°C to obtain 160.8mg of heavy metal ion adsorbent for straw derivatives ;

[0040] The prepared straw derivative heavy metal ion adsorbent...

Embodiment 3

[0042] The wood fiber of present embodiment adopts eucalyptus, and its specific process is as follows:

[0043](1) The dried eucalyptus is ball-milled to obtain eucalyptus powder;

[0044] (2) Add 100 mg of eucalyptus powder into 5 mL of dimethyl sulfoxide / lithium chloride (DMSO / LiCl, the weight ratio of DMSO to LiCl is 25:2) solvent system, and stir at room temperature for 5 hours to obtain a eucalyptus solution;

[0045] (3) Add 250 mg of maleic anhydride to the eucalyptus solution, and stir for 5 hours at room temperature in a dry and airtight container isolated from moisture, so that the maleic anhydride and eucalyptus react in the solvent system;

[0046] (4) After the reaction, pour into 200mL water, stir well for 30min to precipitate the product, centrifuge at 10000rpm for 30min to collect the solid and wash with water, freeze-dry at -40°C to obtain eucalyptus derivatives, and weigh them to obtain eucalyptus derivatives Heavy metal ion adsorbent 137.5mg;

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Abstract

The invention discloses a method for preparing a heavy metal ion adsorbent using maleic acylation wood fibers at room temperature and belongs to the field of biomass chemistry and renewable resource utilization. The method disclosed by the invention comprises the following steps: completely dissolving ball-milled wood fiber powder in a room-temperature solvent system, adding maleic anhydride for reaction at room temperature, performing precipitation, washing and freeze-drying after the reaction is completed, so as to obtain a heavy metal ion adsorbent containing wood fiber derivatives. According to the adsorbent preparation method used in the invention, the wood fiber dissolution and modification procedures are both performed at room temperature without heating, so as to reduce the equipment requirement and energy consumption. The prepared adsorbent can effectively adsorb heavy metal ions in a solution, and has an important scientific value and practical significance in development and utilization of wood fiber biomass and other renewable resources.

Description

technical field [0001] The invention belongs to the fields of biomass chemistry and renewable resource utilization, and in particular relates to a method for preparing a heavy metal ion adsorbent at room temperature from maleylated wood fiber. Background technique [0002] Wood fiber has many advantages such as large output, low price, renewable, short regeneration cycle, biodegradable, and environmentally friendly. With the development of industrial society, non-renewable resources such as petroleum are increasingly in short supply. At the same time, environmental pollution caused by industrial development has also attracted increasing attention. The conversion of renewable resources such as wood fiber to obtain high calorific value energy, new industrial raw materials, fine chemicals, food , drugs and feed, etc. have inevitably become the trend of future development. Many countries, especially developed countries, have listed the conversion and utilization of wood fiber an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30
Inventor 张爱萍谢君
Owner SOUTH CHINA AGRI UNIV
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