Preparation method of suspended spherical attapulgite adsorbent and its application in treating heavy metals in industrial wastewater
An attapulgite and adsorbent technology, which is applied in the field of adsorbent technology and sewage treatment, can solve the problems of incapable of realizing efficient comprehensive utilization, insignificant adsorption effect, poor dispersion of attapulgite, etc., and achieves increased external specific surface area and low treatment cost. , the effect of expanding the internal aperture
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[0026] The preparation method of adsorbent of the present invention, it may further comprise the steps:
[0027] (1) Attapulgite acidic pretreatment, the specific process is: take the attapulgite and grind it through a 200-300 mesh sieve, and add it to a high-speed disperser, then add distilled water, the solid-to-liquid ratio of the attapulgite to distilled water is 1: 20~1:30, the stirring speed is 10000~15000rpm, disperse for 5~15min, then add 9~12mol / L hydrochloric acid, the solid-liquid ratio of attapulgite and hydrochloric acid is 1:5~1:15, the rotational speed is 2000~4000rpm, Rotate for 1-2 hours, filter, wash with distilled water until neutral, dry at 100-110°C, cool, grind, and pass through a 200-300 mesh sieve to obtain an acid-treated attapulgite.
[0028] (2) The preparation of the attapulgite mesoporous material, the specific process is: take the surfactant cetyltrimethylammonium chloride and dissolve it in distilled water, the solid-liquid ratio is 1:30~1:70, an...
Embodiment 1
[0034] (1) Acidic pretreatment of attapulgite, the specific process is: take 12g of attapulgite and grind it through a 250-mesh sieve, add it to a high-speed disperser, add 276mL of distilled water, stir at 12000rpm, disperse for 7min, and then add 96mL Hydrochloric acid with a concentration of 11mol / L, the speed is 3000rpm, rotate for 1.5h, filter, wash with distilled water until neutral, dry at 105°C, cool, grind, and pass through a 250-mesh sieve to obtain an acid-treated attapulgite.
[0035] (2) Preparation of attapulgite mesoporous material, the specific process is: take 6g of surfactant cetyltrimethylammonium chloride and dissolve it in 240mL of distilled water, then add 4.8g of acid-treated attapulgite at a concentration of 6mol / L NaOH solution to adjust the pH=12, stirred and ultrasonicated at 1300rpm for 15min, then transferred the mixture to a polytetrafluoroethylene autoclave, heated at 103°C for 27h, cooled to room temperature, and then distilled water and no Was...
Embodiment 2
[0039] (1) Acidic pretreatment of attapulgite, the specific process is: take 14g of attapulgite and grind it through a 300-mesh sieve, add it to a high-speed disperser, add 350mL of distilled water, stir at 14000rpm, disperse for 10min, and then add 140mL Hydrochloric acid with a concentration of 10.5mol / L, the speed is 3000rpm, rotate for 2h, filter, wash with distilled water until neutral, dry at 105°C, cool, grind, and pass through a 300-mesh sieve to obtain an acid-treated attapulgite.
[0040] (2) The preparation of the attapulgite mesoporous material, the specific process is: take 12g of surfactant cetyltrimethylammonium chloride and dissolve it in 600mL of distilled water, then add 12g of acid-treated attapulgite, and use a concentration of 6mol / L of NaOH solution to adjust pH = 12, stirred and ultrasonicated at 1600rpm for 20min, then transferred the mixture to a polytetrafluoroethylene autoclave, heated at 105°C for 30h, cooled to room temperature, and then washed wit...
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