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نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • preparation and performance of a novel composite as a reactive resin for copper retention

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 648
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a novel magnetic nano-resin was fabricated by supporting nickel hexacyanoferrate on fe3o4 nanoparticles and immobilizing them within pan matrix. the prepared composite was characterized using ftir, tg–dta, xrd, sem and bet-n2 measurements. the textural properties indicated the existence of slit-shaped pores and showed larger pores formed between plate-like particles. ftir analysis suggested the presence of both hexacyanoferrate (ii) and hexacyanoferrate (iii) anions in the nano-composites. further, data clarified a typical face-centered cubic structure with the molecular formula k2ni[fe(cn)6]·3h2o. the resins were relatively fine, homogeneous with presence of little irregular clusters and had 15–25 nm average size. the kinetics of copper retention followed pseudo-second-order expression with k2 values 3.81 × 10−5 g mg−1 min−1. copper sorption was ph-dependent and qmax was attained at ph 6.0 suggesting sorption by single cu2+ species through molar exchange with either h+ or k+ ions at low ph values. in neutral solution, cu2+ ions were retained by surface complexation besides ion exchange and hydrogen bonding interactions, while precipitation was the relevant mechanism taking place in basic medium. intra-particle diffusion played a significant role at the initial stage of sorption and presence background electrolyte significantly reduced cu2+ removal. freundlich model appropriately described the removal of cu(ii) through a favorable sorption process.

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