A kind of phosphorus removal composite adsorbent and its preparation method and application in sewage treatment
A composite adsorption and aquaculture technology, which is applied in the direction of adsorption water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., and can solve problems such as eggshell-based biochar that have not been reported yet
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[0038] A preparation method for phosphorus removal composite adsorbent, characterized in that: comprising the following steps:
[0039] Step 1: soak the washed and dried aquatic waste Artemia eggshells in MgCl 2 In the solution, after 70Hz ultrasonic oscillation at 25°C, stir at 60°C for 24 hours, filter the solid and dry to obtain magnesium-loaded eggshells; the amount of aquatic waste Artemia eggshells is MgCl per 100mL 2 Add 2-10 g of aquatic waste Artemia egg shells to the solution, preferably, per 100 mL of MgCl 2 Add 4g of aquatic waste Artemia egg shells to the solution; MgCl 2 The quality fraction is 8%-16%;
[0040] Step 2: Place magnesium-loaded eggshells in a vacuum tube furnace, slowly pyrolyze them under anaerobic conditions, grind the solids obtained by pyrolysis, wash them with water, and dry them to obtain a carbon-based nano-magnesium composite with a hierarchical pore structure Adsorbent; the pyrolysis temperature of the vacuum tube furnace is 550-800°C, p...
Embodiment 1
[0049] The preparation mass fraction is 16% MgCl 2 Solution 100mL, add 4g of pre-cleaned and dried aquatic waste Artemia egg shells to it, disperse by ultrasonic vibration at 25°C and 70Hz for 30min, then place it on a constant temperature magnetic stirrer at 60°C for 24 hours, filter to obtain solid . The filtered solid was placed in a drying oven, dried at 60° C. for 24 hours, and then ground and pulverized with a mortar to obtain magnesium-loaded egg shells.
[0050] The magnesium-loaded egg shells were placed in a vacuum tube furnace, protected by nitrogen, and heated to 600°C at a rate of 5°C / min for pyrolysis for 6h. The pyrolyzed solid is ground and sieved, washed with deionized water until it is nearly neutral, and then dried in a drying oven at 60°C to obtain a phosphorus removal composite adsorbent.
[0051] The prepared phosphorus removal composite adsorbent has the sub-10 nanometer rod-like MgO morphology on its surface as follows: figure 1 As shown, the interna...
Embodiment 2
[0055] The preparation mass fraction is 8% MgCl 2 Solution 100mL, add 4g of pre-cleaned and dried aquatic waste Artemia egg shells to it, disperse by ultrasonic vibration at 25°C and 70Hz for 30min, then place it on a constant temperature magnetic stirrer at 60°C for 24 hours, filter to obtain solid . The filtered solid was placed in a drying oven, dried at 60° C. for 24 hours, and then ground and pulverized with a mortar to obtain magnesium-loaded egg shells.
[0056] Place magnesium-loaded egg shells in a vacuum tube furnace, protect with nitrogen, and heat up to 600°C at a rate of 5°C / min for pyrolysis for 6 hours. The pyrolyzed solid is ground and sieved, washed with deionized water until it becomes neutral, and dried in a drying oven at 60° C. to obtain a phosphorus removal composite adsorbent.
[0057] Add 50 mL of KH with an initial phosphorus concentration of 50 mg / L (calculated as P) into the conical flask 2 PO 4 solution (simulated sewage), add 0.05 g of the phos...
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