Preparation method of activated carbon with high adsorption rate
A technology of activated carbon and high adsorption, applied in chemical instruments and methods, inorganic chemistry, other chemical processes, etc., can solve the problems of low specific surface area and poor adsorption capacity of biomass activated carbon, and achieve fast adsorption rate, high adsorption rate, abundant The effect of the pore structure
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Embodiment 1
[0035] Embodiment one: the preparation of luffa root activated carbon
[0036] The loofah is obtained by drying the loofah in the sun and removing the seeds. After crushing and drying, it is pre-oxidized in a muffle furnace for 3 hours at 200-250 °C, and then cooled to room temperature to obtain the pre-oxidized loofah.
[0037] The activator ZnCl 2 Add appropriate amount of water and mix evenly with pre-oxidized loofah at a mass ratio of 3:1, soak overnight at room temperature and then dry. The sample was then placed in a tube furnace at N 2 Under the protection of the atmosphere, the temperature was raised to the target temperature (600, 700, 800, and 900 °C) at a rate of 5 °C / min, then the temperature was kept constant for 3 h, and then naturally dropped to room temperature. Add an appropriate amount of 20% HCl to the obtained carbonized sample, stir at room temperature for 3 h, then wash with distilled water until neutral, and dry to obtain loofah-based activated carbon....
Embodiment 2
[0038] Example 2: Detection structure characterization
[0039] 1. Surface Topography
[0040] The microstructure of the loofah-based activated carbon samples was tested using a Quanta 250 scanning electron microscope (SEM) produced by Czech FEI company.
[0041] The result is as Figure 1 ~ Figure 4 As shown, it can be seen from the figure that the surface of the sample LAC-600 is not smooth, there is a large degree of unevenness, and there are surface losses of different sizes in some places; the surface of the sample LAC-700 has damaged Holes, and there are obvious ravines, this is because as the temperature rises, the degree of carbonization activation deepens, causing damage to the pore walls. The surface of the sample LAC-800 has many tiny folds densely packed together; the surface of the sample LAC-900 has many tiny cross-sectional blocks, which is mainly due to the collapse of the carbon skeleton due to the high carbonization temperature, resulting in many cross-sect...
Embodiment 3
[0051] Embodiment three: adsorption performance test
[0052] Prepare methylene blue solutions with concentrations of 1, 2, 3, 4, 5, and 6 mg / L to test their absorbance at the maximum absorption wavelength of 664 nm, and draw a standard curve of methylene blue concentration-absorbance.
[0053] Weigh several 10 mg samples of LAC-800, place them in 50 mL conical flasks, add 20 mL of methylene blue solution with a concentration of 50 mg / L, shake at room temperature, take out a sample at regular intervals, and centrifuge , take the supernatant, measure its absorbance, and measure its adsorption equilibrium time.
[0054] Weigh 10 mg of samples at different carbonization activation temperatures, place them in 50 mL Erlenmeyer flasks, add 20 mL of methylene blue solution with a concentration of 50 mg / L, shake at room temperature, take out when the adsorption equilibrium time is reached, centrifuge, and take Measure the absorbance of the supernatant, calculate the concentration of ...
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