Abstract
In this paper, Methacrylic acid (MAA) and 4-vinyl pyridine (4-VP) as functional monomers, Ethylene glycol two methyl acrylate (EGDMA) as crosslinking agent, isopropyl alcohol as the solvent, prepared the Cu(II)- and Pb(II)- imprinted polymers (IIPs) submicron spheres by precipitation polymerization. The presence/absence of the template ion in the preparation of the imprinted polymer was confirmed by EDX spectroscopy, and the structure of the particles was investigated using IR, SEM and BET analysis. From different components of crosslinker/monomer (C/M) ratio analysis, C/M at 1:3 was the optimal ratio for preparing IIPs. Atomic absorption spectroscopy (AAS) was characterized the imprinted polymers absorption behavior. The results show that the maximum adsorption capacity of Cu2+ and Pb2+ -imprinted polymer were 26.9 mg g−1 and 25.3 mg g−1, respectively. They also have good adsorption capacity and superior selectivity property for Cu2+ and Pb2+ in water, respectively. The selectivity factors (α) for Ni2+, Zn2+, Co2+ and Fe2+ were 16.5 (Cu2+) and 12.1 (Pb2+), 13.8 (Cu2+) and 16.2 (Pb2+), 10.8 (Cu2+) and 10.1 (Pb2+), 20.4 (Cu2+) and 20.7 (Pb2+), respectively. The regeneration experiment result demonstrates an excellent re-utilization property of these two type IIPs, after ten uses, the adsorption capacity can maintain above 60%.
Highlights
The industrial wastewater is the serious problems of worldwide pollution.Especially the sewage containing heavy metals is an important factor causing damage to the environment and human body [1]
Because the carboxylic acid group from methacrylic acid (MAA) was dissociated in aqueous solution, and gave off the hydrogen ions, this is the source of protonation of 4- vinyl pyridine (4-VP), which will be attracted by N
In this paper, Cu(II)- and Pb(II)-ion-imprinted polymer submicron spheres were synthesized by precipitation polymerization
Summary
The industrial wastewater is the serious problems of worldwide pollution. Especially the sewage containing heavy metals is an important factor causing damage to the environment and human body [1]. Prasada Rao team prepared Dy-IIP using 5,7-dichloroquinoline 8-ol (DCQ) and 4-vp as the functional monomer [18],the polymer exhibits excellent adsorption capacity and selectivity in the presence of interfering ions They prepared rare earth metal ion-imprinting polymers with templates of Tb [19], Yb [20], Sm [21], La [22] and Ce[23], which were promoted the ion-imprinting technology applications development. The adsorption capacity of the imprinted polymers was measured for several metal ions to demonstrate the selective separation of the template ion, Cu(II) and Pb(II). 0.1 g IIP particles was placed in 100 mL aqueous ion (Cu2+or Pb2+ ) at 30 ppm, pH was adjusted from 2 to 7 by the addition of 0.1 N NaOH and 0.1 N HCl. In order to analyze the maximum adsorption capacity of ion imprinted submicron spheres, 0.1g of dried IIP was evenly dispersed in 100mL 5-60ppm ionic aqueous solutions with different concentrations. This process is repeated more than 10 times to test IIPs repeatability
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