Secondary modified carbon-based phosphorus adsorption composite material as well as preparation method and application thereof
A secondary modification and composite material technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of easy agglomeration, reduction of adsorption sites and specific surface area, and insufficient adsorption capacity, etc. question
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Embodiment 1
[0032] Bimetal type comparison case: Weigh 1g of multi-walled carbon nanotubes and add them to 100mL of Fe / La, Mg / La, Fe / Mg bimetallic ion solutions with a total metal molar concentration of 21mmol / L. : 1 molar ratio, adjust the pH of the solution to 7 after it is uniformly mixed, place the sealed conical flask in a constant temperature water bath shaker at 25°C, 200r / min for 24h, then react in an oven at 80°C for 6h, and let it stand , filtering, washing, and finally drying at 105° C., and the obtained samples are three primary modified carbon nanotube materials.
[0033] Such as figure 1 As shown, the adsorption amount of P by three kinds of bimetallic modified carbon nanotubes was compared with the non-bimetallic modified carbon nanotubes as a reference. It can be seen that among the bimetallic modified carbon nanotube materials, Fe / La modified carbon nanotubes have the best adsorption effect on P.
Embodiment 2
[0035] The preparation method of composite material, comprises the following steps:
[0036] S1. Fe / La bimetallic modification of multi-walled carbon nanotubes
[0037] Weigh 0, 0.125, 0.25, 0.5 g of multi-walled carbon nanotubes, respectively, and add them to 100 mL of FeCl with a total metal molar concentration of 21 mmol / L 3 and LaCl 3 ·7H 2 O mixture, where Fe 3+ and La 3+ The concentration ratio is 0:10, 1:9, 3:7, 5:5, 7:3, 9:1, 10:0; after it is uniformly mixed, the pH of the solution is adjusted to 7, and the sealed conical flask is placed in Oscillate in a constant temperature water bath oscillator at 25°C and 200r / min for 24h, then react in an oven at 80°C for 6h, stand still, filter, wash, and finally dry at 105°C. The obtained sample is a primary modified carbon nanotube material CNTs -Fe / La.
[0038] S2. Secondary modification of Fe / La bimetallic modified carbon nanotube materials by cationic surfactant
[0039] Weigh 0.75g of Fe / La bimetallic modified carbo...
Embodiment 3
[0043] Preparation method of composite material obtained by secondary modified carbon tube:
[0044] When 0.25g of carbon tubes, Fe / La is 7:3, prepared under neutral conditions, and other conditions are the same as in Example 2, the obtained composite material C-CNTs-7Fe / 3La.
[0045] Specific methods for the adsorption isotherm of phosphate:
[0046] 100mL of KH with a concentration gradient of 1, 5, 8, 10, 15, 20, 30, 50, 80, 100, 150mg / L 2 PO 4 Solution, the dosage of C-CNTs-7Fe / 3La is 0.5g / L, respectively added to each polyethylene plastic bottle, and three groups of parallel experiments are performed for each concentration. Under the conditions of 15°C, 25°C, and 35°C, shake the reaction in a shaker at 150r / min, seal and shake until it reaches adsorption equilibrium, take the supernatant and pass it through a 0.45μm water-based microporous filter membrane, measure and calculate the concentration of phosphorus and its adsorption equilibrium.
[0047] Depend on Figure...
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