Preparation method of adsorption material with high selectivity on different heavy metal ions
A technology of heavy metal ions and adsorption materials, applied in the field of environmental chemistry and engineering, to achieve the effects of low cost, high efficiency, easy elution and recovery
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Embodiment 1
[0017] Implementation Example 1 For Cu 2+ Preparation of materials with highly selective adsorption
[0018] Weigh 500g of montmorillonite soil, roast at 300°C for 4 hours, grind, and pass through a 200-mesh sieve. Add 100 g of activated montmorillonite into the reaction vessel, add 1 L of deionized water, make a slurry, and then add 20 mL of hydrochloric acid with a concentration of 1 mol / L, 40 g of double-distilled aniline, 5 g of initiator, and 5 mL KH-570, and a small amount of ammonium persulfate, slowly stirred for polymerization for 6 hours. The reaction product is subjected to suction filtration, water washing, drying and grinding in sequence, and then passed through a 150-mesh sieve.
[0019] In a reactor, 50 g of the above polymerized powder was mixed with 150 mL of Cu with a concentration of 150 mg / L 2+ The solution was mixed evenly, and the pH value of the system was adjusted to 6 with NaAC-HAC buffer solution, stirred slowly at 50 °C, reacted for 40 min...
Embodiment 2
[0021] Implementation Example 2 For Cr 3+ Preparation of materials with highly selective adsorption
[0022] Weigh 500g of montmorillonite soil, roast at 300°C for 4 hours, grind, and pass through a 200-mesh sieve. Add 100 g of activated montmorillonite into the reaction vessel, add 1 L of deionized water, make a slurry, and then add 20 mL of hydrochloric acid with a concentration of 1 mol / L, 30 g of double-distilled aniline, 5 g of initiator, and 5 mL KH-570, and a small amount of ammonium persulfate, slowly stirred for polymerization for 6 hours. The reaction product is subjected to suction filtration, water washing, drying and grinding in sequence, and then passed through a 150-mesh sieve.
[0023] In a reactor, 50 g of the above polymerized powder was mixed with 150 mL of Cr at a concentration of 100 mg / L 3+ The solution was mixed evenly, and the pH value of the system was adjusted to 5 with NaAC-HAC buffer solution, stirred slowly at 50 °C, reacted for 40 min, ...
Embodiment 3
[0025] Implementation example 3 to Cu 2+ Preparation of materials with highly selective adsorption
[0026] Weigh 500g of nano-silica, bake at 400°C for 2 h, grind, and pass through a 200-mesh sieve. Add 100 g of activated nano-silicon dioxide into the reaction vessel, inject 200 mL of deionized water, and make a slurry. Take 10 g of chitosan and dissolve it in 300 mL of 0.1mol / L acetic acid solution, add it to the above reactor, then add 5 mL of silane coupling agent to the reactor, stir continuously, react for 4 h, pump Filter, wash with water, dry and grind. Weigh 50 g of the above materials and 100 mL of Cu with a concentration of 200 mg / L 2+ The solutions were mixed, and the pH value of the system was adjusted to 6 with NaAC-HAC buffer solution, reacted at 50 °C for 40 min, and then washed repeatedly with deionized water until no Cu was detected. 2+ , dried and ground. Take 50g of the above Cu 2+ The chelating adsorption material was placed in 100 mL of a...
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