Method for preparing modified wheat straw hydrothermal charcoal by adopting KOH
A technology of wheat straw and biochar, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of limited adsorption sites, adsorption performance and stability limitations, etc., and achieve improved adsorption performance , far-reaching social significance and economic value, the effect of moderate conditions
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Embodiment 1
[0026] The preparation method of hydrothermal biochar modified by KOH wheat straw, the steps are as follows:
[0027] 1) crushing wheat straw (WS) into straw powder, the particle size of which is passed through a 50-mesh sieve;
[0028] 2) Add 5.0g of wheat straw powder and 60mL of distilled water in turn into a 100mL reactor, and seal it;
[0029] 3) Place the reaction kettle in an oven, react at a constant temperature of 200°C for 20 hours, and then cool to room temperature;
[0030] 4) Take out the solid-phase product, wash it with distilled water until neutral, dry it at 105°C and store it in a sealed container to obtain wheat straw hydrothermal biochar (H-WS);
[0031] 5) Mix 2.0 g of wheat straw hydrothermal biochar with 2N KOH solution, stir well for 1 hour, filter, wash with water, and dry to obtain modified wheat straw hydrothermal biochar (mH-WS).
[0032] like figure 1 As shown, the impurity content on the surface of wheat straw hydrothermal biochar was obvious b...
Embodiment 2
[0038] Weigh 0.06 g of modified wheat straw hydrothermal biochar, add 30 mL of 20 mg / L cadmium solution (containing 0.01 mol / L NaNO 3 As a background solution), adjust the pH of the solution with 0.1mol / L NaOH and nitric acid, place the sample bottle in a shaker at 150r / min, shake at 30°C, take samples at different time periods, filter with a 0.22μm filter membrane, and use Atomic absorption spectrophotometer (AA240FS, VARIAN) was used to measure the concentration of Cd(II) in the filtrate. For the unmodified hydrothermal biochar, the same steps as above were taken for comparison.
[0039] image 3 It shows that before and after the modification of wheat straw hydrothermal biochar, the adsorption equilibrium time is the same, but the removal rate of Cd(II) after modification is significantly improved, from 10% of H-WS to 98% of mH-WS, indicating that the modification Hydrothermal biochar has good removal ability for heavy metal cadmium.
Embodiment 3
[0041] Weighed 0.06 g of modified wheat straw hydrothermal biochar, and added 30 mL of cadmium solutions with different concentrations (containing 0.01 mol / L NaNO 3 As a background solution), adjust the pH of the solution with 0.1mol / L NaOH and nitric acid, place the sample bottle in a shaker at 150r / min, shake at 30°C for 24h, take a sample, filter it with a 0.22μm filter membrane, and use atomic absorption spectrophotometry Meter (AA240FS, VARIAN) was used to measure the concentration of Cd(II) in the filtrate. For the unmodified hydrothermal biochar, the same steps as above were taken for comparison.
[0042] like Figure 4 As shown, the maximum adsorption capacity of hydrothermal biochar before and after modification was 14.05 and 39.15 mg / L, respectively, and the adsorption capacity of modified hydrothermal biochar on Cd(II) increased by nearly 3 times, indicating that the modified hydrothermal biochar had a significant effect on Heavy metal Cd(II) has good adsorption p...
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