Greenhouse gas emission reduction method for heavy metal contaminated soil
A technology of greenhouse gases and polluted soil, applied in the restoration of polluted soil, etc., can solve the problems of short duration, poor soil application effect, and large variation of emission reduction effect, so as to achieve reduced emissions and realize the goal of heavy metal pollution control Effect
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Embodiment 1
[0024] Hydroxyapatite (HAP) is mainly prepared from calcium nitrate and phosphoric acid through the sol-gel method. The main operation steps are:
[0025] 1. Prepare 0.025mol / L Ca(NO 3 ) 2 and 0.3mol / L of H 3 PO 4 solution. Ca(NO 3 ) 2 The solution was poured into a three-necked flask, and H was added while stirring. 3 PO 4 Solution (Ca(NO 3 ) 2 solution and H 3 PO 4 The volume ratio of the solution is 2:1), and the temperature of the system is maintained at 40-50°C.
[0026] 2. Add ammonia water to adjust the pH of the solution so that the pH value is controlled at 10.00. After the dropwise addition was completed, the reaction was continued for 40 minutes, and then aged for 24 hours.
[0027] 3. The colloid obtained after the reaction was completed was washed 3 times with distilled water, filtered with suction to obtain a filter cake, and dried in a drying oven at 80°C.
[0028] 4. Grind the dried filter cake, and then calcinate it in a muffle furnace for 12 ho...
Embodiment 2
[0031] 1. Prepare 0.025mol / L Ca(NO 3 ) 2 and 0.3mol / L of H 3 PO 4 solution. Ca(NO 3 ) 2 The solution was poured into a three-necked flask, and H was added while stirring. 3 PO 4 Solution (Ca(NO 3 ) 2 solution and H 3 PO 4 The volume ratio of the solution is 2:1), and the temperature of the system is maintained at 40-50°C.
[0032] 2. Add ammonia water to adjust the pH of the solution so that the pH value is controlled at 9.00. After the dropwise addition was completed, the reaction was continued for 40 minutes, and then aged for 36 hours.
[0033] 3. The colloid obtained after the reaction was completed was washed with distilled water for 4 times, filtered with suction to obtain a filter cake, and dried in a drying oven at 80°C.
[0034] 4. Grind the dried filter cake, and then calcinate it in a muffle furnace for 12 hours (3 hours from normal temperature to 600°C, then calcinate at 600°C for 9 hours), and then grind it again to obtain HAP powder, pass through 180...
Embodiment 3
[0037] 1. Prepare 0.025mol / L Ca(NO 3 ) 2 and 0.3mol / L of H 3 PO 4 solution. Ca(NO 3 ) 2 The solution was poured into a three-necked flask, and H was added while stirring. 3 PO 4 Solution (Ca(NO 3 ) 2 solution and H 3 PO 4 The volume ratio of the solution is 2:1), and the temperature of the system is maintained at 40-50°C.
[0038] 2. Add ammonia water to adjust the pH of the solution so that the pH value is controlled at 11.00. After the dropwise addition was completed, the reaction was continued for 40 minutes, and then aged for 24 hours.
[0039] 3. The colloid obtained after the reaction was completed was washed with distilled water for 5 times, filtered with suction to obtain a filter cake, and dried in a drying oven at 80°C.
[0040] 4. Grind the dried filter cake, and then calcinate it in a muffle furnace for 12 hours (3 hours from room temperature to 600°C, then calcined at 600°C for 8 hours), and then grind it again to obtain HAP powder, pass through 180 m...
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