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  • Poly(methacrylic acid)-grafted chitosan microspheres via surface-initiated ATRP for enhanced removal of Cd(II) ions from aqueous solution.

Poly(methacrylic acid)-grafted chitosan microspheres via surface-initiated ATRP for enhanced removal of Cd(II) ions from aqueous solution.

Journal of colloid and interface science (2013-06-13)
Liqiang Huang, Shaojun Yuan, Li Lv, Guangqun Tan, Bin Liang, S O Pehkonen
RESUMEN

Cross-linked chitosan (CCS) microspheres tethered with pH-sensitive poly(methacrylic acid) (PMAA) brushes were developed for the efficient removal of Cd(II) ions from aqueous solutions. Functional PMAA brushes containing dense and active carboxyl groups (COOH) were grafted onto the CCS microsphere surface via surface-initiated atom transfer radical polymerization (ATRP). Batch adsorption results showed that solution pH values had a major impact on cadmium adsorption by the PMAA-grafted CCS microspheres with the optimal removal observed above pH 5. The CCS-g-PMAA microsphere was found to achieve the adsorption equilibrium of Cd(II) within 1 h, much faster than about 7 h on the CCS microsphere. At pH 5 and with an initial concentration 0.089-2.49 mmol dm(-3), the maximum adsorption capacity of Cd(II), derived from the Langmuir fitting on the PMAA-grafted microspheres was around 1.3 mmol g(-1). Desorption and adsorption cycle experimental results revealed that the PMAA-grafted CCS microspheres loaded with Cd(II) can be effectively regenerated in a dilute HNO3 solution, and the adsorption capacity remained almost unchanged upon five cycle reuse.

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Sigma-Aldrich
Ácido nítrico, ACS reagent, 70%
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Ácido nítrico, 70%, purified by redistillation, ≥99.999% trace metals basis
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Ácido nítrico, puriss. p.a., reag. ISO, reag. Ph. Eur., for determinations with dithizone, ≥65%
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Ácido nítrico, puriss. p.a., 65.0-67.0%
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Ácido nítrico, puriss. p.a., ≥65% (T)
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Ácido nítrico, ACS reagent, ≥90.0%
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Ácido nítrico solution, 0.1 M HNO3 in water (0.1N), eluent concentrate for IC
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Poly(methacrylic acid, sodium salt) solution, average Mn ~5,400, average Mw ~9,500 by GPC, 30 wt. % in H2O
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Poly(methacrylic acid, sodium salt) solution, average Mw 4,000-6,000, 40 wt. % in H2O