A kind of geopolymer adsorption material and its preparation method
A technology of geopolymers and adsorption materials, applied in silicon compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of poor adsorption performance, high application cost, and failure to widely popularize applications, etc., to achieve cost The effect of low cost, high cost and good application prospect
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Embodiment 1
[0037] The preparation of embodiment 1 geopolymer adsorption material
[0038] The present embodiment provides a geopolymer adsorption material, including the following raw materials in parts by weight: 33.3 parts of fly ash, 66.7 parts of metakaolin, 65.6 parts of water glass, 14.4 parts of sodium hydroxide and 40 parts of deionized water;
[0039] Among them, metakaolin is obtained by calcining raw kaolin powder at 900°C for 3 hours, and the fly ash and metakaolin are respectively passed through a 100-mesh sieve; the modulus of water glass is 3.3.
[0040] The preparation method of the geopolymer adsorption material of the present embodiment comprises the following steps:
[0041] (1) Mix fly ash and metakaolin evenly to obtain aluminosilicate powder;
[0042] (2) After mixing water glass and sodium hydroxide, carry out ultrasonic treatment for 20 minutes, and then stand at room temperature for 24 hours to obtain an alkali activator;
[0043] (3) mix the aluminosilicate po...
Embodiment 2
[0047] Embodiment 2 Utilizes the geopolymer adsorption material of Embodiment 1 to adsorb heavy metal ions in the solution under different time conditions
[0048] Using Pb(NO 3 ) 2 , Cd(NO 3 ) 2 and Cu(NO 3 ) 2 Reagents prepare a certain concentration of heavy metal solutions, using NaOH and HNO 3 Adjust the pH of the solution. Weigh 0.1 g of geopolymer adsorption material, add it to 25 ml of heavy metal solution, shake at 25°C, and absorb heavy metals under different time conditions. The adsorption solution was filtered through a microporous membrane with a pore size of 0.45 μm, and the concentration of heavy metal ions in the solution was determined by atomic absorption method.
[0049] Among them, the initial concentration and initial pH of heavy metal ions in each solution are: Pb 2+ 300mg / L, pH=3; Cd 2+ 300mg / L, pH=5; Cu 2+ 200mg / L, pH=4. The adsorption time gradient is set as: 0, 5, 10, 20, 40, 80, 120, 180, 240, 300, 400, 600min.
[0050] Effect of geopolym...
Embodiment 3
[0051] Embodiment 3 Utilizes the geopolymer adsorption material of Embodiment 1 to adsorb heavy metals of different concentrations
[0052] Using Pb(NO 3 ) 2 , Cd(NO 3 ) 2 , Cu(NO 3 ) 2 The reagents prepare heavy metal solutions with different concentration gradients, using NaOH and HNO 3 Adjust the pH of the solution. Pb 2+ The initial pH is set to 3, and the initial concentration gradient is set to 100, 200, 300, 500, 800, 1000mg / L; Cd 2+ The initial pH is set to 5, and the initial concentration gradient is set to 50, 100, 200, 300, 500, 800mg / L; Cu 2+ The initial pH was set to 4, and the initial concentration gradient was set to 50, 100, 200, 300, 500mg / L.
[0053] Weigh 0.1 g of geopolymer adsorption material, add it to 25 ml of heavy metal solution, and shake for 300 min at 25 ° C to make the adsorption reach equilibrium. The adsorption solution was filtered through a microporous membrane with a pore size of 0.45 μm, and the concentration of heavy metal ions in ...
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