Preparation method of chemically grafted and modified biomass adsorbent
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A technology of biomass adsorbent and chemical grafting, which is applied in the direction of chemical instruments and methods, inorganic chemistry, alkali metal compounds, etc., can solve the problems of weak adsorption capacity of metal ions, etc., and achieve the problem of easy oxidation, high stability, no easy to be effected
Inactive Publication Date: 2020-05-29
HEILONGJIANG HEIKE TECH CO LTD +1
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[0003] The purpose of the present invention is to solve the problem that the existing cellulose-rich biomass adsorbents have weak adsorption capacity for metal ions, and provide a preparation method of chemically grafted modified biomass adsorbents
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specific Embodiment approach 1
[0016] Specific embodiment one: the preparation method of the chemically grafted and modified biomass adsorbent of this embodiment is implemented according to the following steps:
[0017] 1. The biomass material is pyrolyzed at 350°C to 600°C by oxygen-limited heating carbonization method to obtain a biochar adsorbent, and after natural cooling, the biochar adsorbent is pulverized to obtain carbonized biomass;
[0018] 2. Add the carbonized biomass to the chloroform solution of pyridine, add 4-bromobutyryl chloride dropwise, seal the reaction mixture, filter it after oscillating for 10h-16h, rinse with chloroform, and obtain the washed biomass;
[0019] 3. Mix polyethyleneimine, KOH and tert-amyl alcohol to obtain a mixed modified solution, immerse the washed biomass in the mixed modified solution, shake and react at a temperature of 70-80°C, wash and dry Finally, a chemically grafted modified biomass adsorbent is obtained.
[0020] In this embodiment, the physical or chemi...
specific Embodiment approach 2
[0021] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the oxygen-limited heating carbonization method described in step 1 is to raise the temperature to 350° C. to 350° C. At 600°C, the biomass material is pyrolyzed.
specific Embodiment approach 3
[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the biomass material described in Step 1 is fungus chaff, corn stalks, rice husk or hemp.
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Abstract
The invention discloses a preparation method of a chemically grafted and modified biomass adsorbent, relates to a preparation method of a biomass adsorbent, and aims at solving the problem that an existing cellulose-rich biomass adsorbent is relatively weak in metal ion adsorption capacity. The preparation method comprises the following steps: 1, carrying out pyrolysis treatment on a biomass material by adopting an oxygen-limited heating carbonization method to obtain carbonized biomass; 2, adding the carbonized biomass into a trichloromethane solution of pyridine, dropwise adding 4-bromobutyryl chloride, sealing the reaction mixed solution, and carrying out an oscillation reaction; and 3, mixing polyethyleneimine, KOH and tert-amyl alcohol to obtain a mixed modified solution, immersing the cleaned biomass into the mixed modified solution, and carrying out an oscillation reaction at a temperature of 70-80 DEG C to obtain the chemically grafted and modified biomass adsorbent. The novelefficient environment-friendly modified biomass adsorbent is prepared through carbonization and graft copolymerization modification by utilizing a method of combining physical activation and chemicalactivation.
Description
technical field [0001] The invention relates to a preparation method of a biomass adsorbent. Background technique [0002] In recent years, people have begun to study the use of agricultural waste modified cellulose adsorbents to adsorb, separate and extract heavy metal ions in wastewater. Compared with general heavy metal treatment methods, this method has large adsorption capacity, fast adsorption speed, and low cost. Low cost, simple operation, no secondary pollution, etc. Therefore, research on this aspect has become a hot spot in this field. Agricultural waste has become one of the most promising materials due to its wide source, main chemical composition of cellulose, hemicellulose and lignin, good biodegradability and certain adsorption performance. Cellulose-rich crop wastes have emerged as a class of low-value adsorbents of choice in the treatment of heavy metal ion pollution. The hydroxyl group on cellulose is an effective group for removing metal ions, but the ...
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