Adsorption of Cu2+ ions with poly(N‐isopropylacrylamide‐co‐methacrylic acid) micro/nanoparticles

Chelation efficiency of stimuli-responsive poly(N-iospropylacrylamide-co-methyacrylic acid) (PNI- PAAm-MAA) nanoparticles with Cu 21 ions from CuSO4� 5H2O solution and from wood treated with copper-based preservatives was studied. It was shown that particle size played a very important role in the adsorption process. The nano-scale particles showed much improved Cu ion adsorption efficiency, compared with the micro hydro- gels. The amount of Cu ion adsorption increased with increase of MAA ratio in copolymers and adsorption effi- ciency decreased with increased particle size. Further- more, the adsorption amount varied with adsorption tem- perature at temperatures both below and above the corre- sponding low critical solution temperature (LCST). The high adsorption efficiency of Cu ions by PNIPAAm-MAA polymer particles provides an effective technique for recovering metal ions (e.g., Cu 21 ) from wood treated with metal-based preservatives. 2008 Wiley Periodicals,

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