Preparation method and application of acid modified biomass carbon material
A biomass carbon and acid modification technology, which is applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve problems such as changes in material morphology, functional groups, and adsorption properties, and achieve removal efficiency high effect
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Embodiment 1
[0028] A method for preparing acid-modified biomass carbon materials. Put 1 g of corn stalks in a beaker, add 20 mL of sulfuric acid with a mass fraction of 1%, mix them, stir for 10 min, put them in an oven, and dry them overnight at 80 °C to obtain sulfuric acid corn straw adsorbent.
[0029] For cationic dye methylene blue adsorption experiment:
[0030]The adsorbent is black, and it is well dispersed in the dye aqueous solution, and can quickly and evenly disperse in the pollutants to achieve a good contact effect. After the contact angle test, the contact angle of the acid-modified corn stalks was reduced from 78° to 23° of the original corn stalks. The hydrophilicity of the acid-modified carbon material becomes better. The adsorption rate of corn straw adsorbent activated by sulfuric acid to 10 mL of 50 ppm methylene blue solution was as high as 91.04%. Compared with the original straw, it has stronger universality to temperature, concentration and pH, and shows excel...
Embodiment 2
[0032] A method for preparing acid-modified biomass carbon materials. Put 1 g of corn stalks in a beaker, add 20 mL of sulfuric acid with a mass fraction of 35%, mix them, stir for 10 min, put them in an oven, and dry them overnight at 80 °C to obtain sulfuric acid corn straw adsorbent.
[0033] For cationic dye methylene blue adsorption experiment:
[0034] When corn stalks and 35% sulfuric acid are mixed, the mixture is viscous and difficult to stir and mix. After drying, the adsorbent appears black and does not disperse well in the dye aqueous solution. A small amount of black particles can be observed in suspension and layered in the upper part, and the black carbon material with larger particles can be seen dispersed in the pollutants in the lower part. The contact effect is not good. After the contact angle test, the contact angle of 35% sulfuric acid modified corn stover was 58°. The hydrophilicity of the acid-modified carbon material is reduced and the hydrophilicit...
Embodiment 3
[0036] A method for preparing acid-modified biomass carbon materials. Put 1 g of corn stalks in a beaker, add 20 mL of sulfuric acid (concentrated sulfuric acid) with a mass fraction of 70% to mix, stir for 10 min, put it in an oven, and bake overnight at 80 °C Dry to obtain sulfated corn stover adsorbent.
[0037] For cationic dye methylene blue adsorption experiment:
[0038] There is a pungent smell when the concentrated sulfuric acid is poured into the corn stalks, the mixture is viscous and difficult to stir, and a large amount of heat is released. After drying, the adsorbent turns black and does not disperse well in the dye aqueous solution. After the adsorbent is added to the dye solution, obvious stratification can be seen, and a large number of black blocky particles float on the upper layer. The contact effect with dye pollutants very bad. After the contact angle test, the contact angle of 70% sulfuric acid modified corn stalks was 69°, and the hydrophilicity of th...
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