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Environmental Informatics Archives

ISSN 1811-0231 / ISEIS Publication Series Number P002

Copyright © 2006 ISEIS. All rights reserved.



  Paper EIA06-018, Volume 4 (2006), Pages 218-224 = complimentary

Application of Super-paramagnetic Composite Particles Technology for the Reclamation of Heavy Metal from Wastewater

Y. F. Chen*, C. Y. Tsai, C. C. Chou and F. R. Yang

Resource Recovery Department, Industrial Technology Research Institute, W200, Rm.303A, Bldg. 64, 195, Sec. 4, Chung Hsing Road, Chutung, Hsinchu, Taiwan 310, R.O.C.. *Corresponding author: Y_FChen@itri.org.tw.



This investigation presents a novel technique for separating and recovering heavy metals using selective super-paramagnetic composite (SPMC) particles. Selective SPMC particles were synthesized in-situ by co-precipitation and free radical polymerization. The adsorption of three metallic ions, Au(III), Sn(IV) and In(III), by selective SPMC particles was evaluated.
The cost of the in-situ synthesis approach presented herein was low and the SPMC particles were stable. Experimental results demonstrate that SPMC particles exhibit excellent adsorption for Au(III) and Sn(III) ions. The adsorption capacity (Q) and adsorption ratio of Au(III) exceeded 245 mg g-1 and 99.8%, respectively, for a reaction time of 30 minutes. The SPMC particles can thus be utilized to recover gold compounds from wastewater derived from a printed circuit board (PCB) and a semiconductor process. The adsorption capacity and adsorption ratio of Sn(IV) exceed 620 mg g-1 and 99.9%, for a reaction time of 30 minutes. However, the affinity of SPMC particles for In(III) is poor. Therefore, the SPMC particles can also be used to separate tin and indium from the ITO extraction solution.

Keywords: super-paramagnetic, in-situ, heavy metal


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