A kind of preparation method of attapulgite and its method for treating heavy metal wastewater
A technology of attapulgite and heavy metals, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of small adsorption capacity, unenvironmental protection, slow sedimentation rate, etc. The effect of promoting diffusion
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Embodiment 1
[0038] A preparation method of novel attapulgite and a method for treating heavy metal wastewater, the steps of which are:
[0039] (1) 20g of attapulgite mineral powder and 100mL of deionized water were mixed in a volumetric flask, stirred at a speed of 150r / min for 45min, after standing for 3h, the supernatant liquid and the lower layer of sand were discarded to obtain the attapulgite purified soil Suspension, the attapulgite obtained after centrifugation of the suspension is placed in an oven to dry at 100°C, and set aside;
[0040] (2) Put the attapulgite after the above pretreatment into sulfuric acid with a concentration of 4mol / L, stir, heat at a constant temperature at 80°C for 1h, cool and let it stand to room temperature, rinse the attapulgite with deionized water, until The rinsing water is neutral, dried and ground at 100°C, and passed through a 200-mesh sieve to obtain acid-modified attapulgite;
[0041] (3) ferrous sulfate and ferric sulfate according to the mol...
Embodiment 2
[0046] 1. Prepare novel modified attapulgite / Fe according to the steps of (1)~(5) in Example 1 3 o 4 Composite material, the difference is: the mass ratio of attapulgite powder and deionized water in step (1) is 1:6, stirs 40min with the rotating speed of 200r / min, then leaves standstill 2.5h; In step (2) The concentration of the sulfuric acid solution is 3mol / L, and it is stirred at a constant temperature at 80°C; in step (3), n(Fe 2+ ):n(Fe 3+ )=1:4, strong (stirring speed is 350r / min) stirring 15min under the condition of constant temperature 70 ℃; The mass ratio of acid-modified attapulgite and iron ion solution, ammonia solution in step (4) is 1: 4:7, when dripping ammonia water, adjust the stirring speed to 120r / min, the ammonia water dripping speed is 2 drops / second, keep the pH of the solution at 12 during the dripping of ammonia water, and the aging time is 25min, then use anhydrous After washing with ethanol four times, the product was dried in a drying oven at 50...
Embodiment 3
[0049] 1. Prepare novel modified attapulgite / Fe according to the steps of (1)~(5) in Example 1 3 o 4 Composite material, the difference is: the mass ratio of attapulgite powder and deionized water in step (1) is 1:8, stirs 40min with the rotating speed of 200r / min, then leaves standstill 2.5h; In step (2) The concentration of the sulfuric acid solution is 5mol / L, and it is stirred at a constant temperature at 80°C; in step (3), n(Fe 2+ ):n(Fe 3+ )=1:5, strongly (stirring speed is 330r / min) stirs 13min under the condition of constant temperature 75 ℃; The mass ratio of acid-modified attapulgite and iron ion solution, ammonia solution in step (4) is 1: 5:8, when dripping ammonia water, adjust the stirring speed to 150r / min, the ammonia water dripping speed is 2 drops / second, keep the pH of the solution at 12 during the dripping of ammonia water, and the aging time is 23min, then use anhydrous After washing with ethanol four times, the product was dried in a drying oven at 55°...
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