Preparation method of adsorbent for complexing heavy metals in water
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A heavy metal and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of complex process control conditions, increased investment, limited adsorption capacity of complex heavy metal ions, etc. Rich, simple process, easy to operate effect
Inactive Publication Date: 2020-04-03
NANJING FORESTRY UNIV
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When heavy metal collectors are used, additional flocculation, filtration or membrane separation processes are usually required, resulting in complex process control conditions and increased investment, etc.
The adsorption method can enrich heavy metal ions or complexed heavy metal ions in water to the surface of the adsorbent, and there is no separation problem after adsorption. However, the most commonly used adsorbent activated carbon material has limited adsorption capacity for complexed heavy metal ions.
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Embodiment 1
[0033] Biomass material preparation: crush poplar wood chips to 60-100 meshes, heat up to 300°C at a rate of 10°C / min in a tube furnace under nitrogen protection, and keep it for 1 hour, then cool down to room temperature naturally , with 100mL of deionized strong stirring to soak the above 1g of biomass material for 2 hours, then suction filtration, and repeated washing with water for 3 times, then dried in an oven at 105°C to constant weight.
[0034] Epoxidation of biomass material: 3 g of biomass material: 20 mL of dimethylformamide: 5 mL of 30% NaOH: 15 mL of epichlorohydrin was stirred in a closed three-necked flask at 90° C. for 1 hour.
[0035] Amination: Lower the temperature in the vessel in the previous step to 40°C, slowly add 5 mL of diethylenetriamine dropwise, and stir for 1 to 5 hours. Wash and filter with appropriate amount of acetone, ethanol, and deionized water three times respectively.
[0040] Biomass material preparation: crush poplar wood chips to 60-100 mesh, heat up to 500°C at a rate of 10°C / min in a tube furnace under nitrogen protection, and keep it for 2 hours, then cool down to room temperature naturally , and then soak the biomass material with 300mL of 1.5mol / L KOH solution under vigorous stirring for 2 hours, then repeatedly soak and wash with deionized water until neutral, and finally dry it in an oven at 105°C to constant weight.
[0041] Epoxidation of biomass material: 3 g of biomass material: 20 mL of dimethylformamide: 5 mL of 30% NaOH: 15 mL of epichlorohydrin was stirred in a closed three-necked flask at 90° C. for 1 hour.
[0042]Amination: Lower the temperature in the container in the previous step to 35°C, slowly drop 5 mL of diethylenetriamine into the mixture, and stir for 3 hours. Wash and filter with appropriate amount of acetone, ethanol, and deionized water three times respectively.
[0043] Dithioamination: Add 30mL absolute eth...
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Abstract
The invention relates to a preparation method of an adsorbent for complexing heavy metals in water. The preparation method comprises the following steps: crushing a biomass raw material to 20-100 meshes, and carrying out heat treatment at 270-500 DEG C under the protection of nitrogen; carrying out violent stirring and soaking treatment with a 0-2 mol/L KOH solution, washing with deionized water to be neutral, and drying; treating at a temperature of 40-90 DEG C according to a ratio of a biological material to dimethylformamide to 30% NaOH to epichlorohydrin of 3 g to 10-30 mL to 0-10 mL to 5-20 mL; reducing the temperature to 30-40 DEG C, slowly adding 2.5-10 mL of diethylenetriamine or triethylenetetramine in a dropwise manner, and treating; adding absolute ethyl alcohol and CS2 into thesample subjected to suction filtration treatment with a proper amount of acetone, ethyl alcohol and deionized water, and treating under an ice-water bath condition; and finally repeatedly washing thesuction filtration sample with deionized water, and drying at 40 DEG C. The prepared adsorbent for complexing heavy metals has the advantages of strong specific surface area, strong chelating capability, easily available materials, rich resources, convenience use, simple operation, no requirement of additional separation process, mild preparation conditions, easy in batch production and the like.
Description
technical field [0001] The invention belongs to the technical field of complex heavy metal pollution removal in water. The invention relates to a method for preparing an adsorbent which is suitable for extensive acid complex heavy metal wastewater, is easy to separate, and does not cause secondary pollution. Specifically, a biomass material with a high specific surface area is used as a substrate, and its surface is modified to implant a dithioamino group with a high complexation competition ability, thereby realizing the removal of complexed heavy metals in water. Background technique [0002] The electroplating industry is currently one of the three major polluting industries in the world. Its water quality is very complex, involving various heavy metals such as copper, nickel, chromium, and other toxic impurities such as acids, alkalis, and cyanides. Especially heavy metals are extremely harmful to humans and the environment. . A large number of complexing agents used i...
Claims
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