Preparing method of manganese oxide-charcoal composite adsorbent
A composite adsorption and biochar technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc., can solve the problem of low pollutant adsorption capacity, insufficient oxygen-containing groups on the surface, biochar Low content of mineral components and other problems, to achieve the effect of widening the suitable pH range, increasing the saturated adsorption capacity, and high adsorption performance
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[0030] Example 1
[0031] The Fraxinus mandshurica sawdust was crushed, passed through a sieve with an aperture of 0.425 mm (40 mesh), and weighed 100 g. Through preliminary experiments, it was determined that the volume of water required for equal volume impregnation was 0.55L. Weigh 14.36gKMnO 4 , Dissolved in 0.55L of water determined by the above experiment, so that the mass ratio of Mn element to biomass is 5.0%. Add the above weighed Fraxinus mandshurica sawdust, and perform pre-impregnation treatment at room temperature (about 28°C) for 8 hours, stirring 4 times in the middle. Then, it was dried in a blast oven at 105°C for 15 hours, and then transferred to a ceramic crucible with a lid, placed in a muffle furnace, and heated at 400°C for pyrolysis and carbonization for 4 hours. After cooling to room temperature, it was soaked in 300 mL of 0.1 mol / L hydrochloric acid solution at room temperature and stirred intermittently for 6 hours to obtain the manganese oxide-fraxinus...
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[0034] Example 2
[0035] According to the steps in Example 1, the biomass raw material was replaced with corn stalks, and the water volume required for the isometric immersion was determined by preliminary experiments to be 0.5L. Keeping other conditions unchanged, the manganese oxide-corn stalk biochar composite can be obtained accordingly. Adsorbent and ordinary cow dung biochar adsorbent.
[0036] Similarly, the specific surface area of the manganese oxide-corn stover biochar composite adsorbent measured according to the method listed in Example 1 is 33.7 m 2 / g, ash content is 21.12%, oxygen-containing group content is 2.40mmoL / g, the specific surface area of ordinary corn stover biochar adsorbent is 4.4m 2 / g, ash content is 4.18%, oxygen-containing group content is 1.9mmoL / g. They are Pb 2+ The results of the adsorption isotherm and adsorption rate-pH curve are shown in the attachment figure 2 And Figure 4 . The results proved that the saturated adsorption capacity o...
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[0037] Example 3
[0038] Follow the steps of Example 1 and keep other conditions unchanged. After pyrolysis and carbonization, cool to room temperature, soak in 300 mL of 0.1 mol / L hydrochloric acid solution at 60° C. and stir intermittently for 6 hours to obtain manganese oxide-scrabble Willow sawdust biochar composite adsorbent. The experimental results show that the manganese oxide-Fraxinus mandshurica sawdust biochar composite material has an effect on Pb 2+ The saturated adsorption capacity is 100.0mg / g, which is lower than the post-treatment adsorption capacity at room temperature.
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