Preparation of Porous Nano-Strontium Titanate and Its Application in Removal of Heavy Metals from Environmental Water

摘要

Porous nano-strontium titanate (PST) was successfully prepared by the reversed-phase suspension polymerization and sol-gel method using reversed-phase suspension droplets as the template, and characterized by XRD and SEM. The ability of the new adsorption to remove lead, cadmium, zinc, copper and nickel ions from water samples was assessed. The results showed that the sorbents were porous, perovskite strontium titanate, and the average particle diameter of crystalloid was 30 nm. The lead, cadmium, zinc, copper and nickel ions were quantitatively retained at pH 5-8; their adsorption capacities of PST for lead, cadmium, zinc, copper and nickel ions were 145.9 mg·g~(-1), 4.3 mg·g~(-1), 25.2 mg·g~(-1), 19.6 mg·g~(-1) and 3.7 mg·g~(-1), respectively. The adsorbent can be regenerated completely by elution with 0.5 mol·L~(-1) HNO_3. The adsorbent has a promising prospect in removal or enriching of lead, cadmium, zinc, copper and nickel in water.