NDLI: Redox Sorption and Recovery of Silver Ions as Silver Nanocrystals on Poly(aniline-co-5-sulfo-2-anisidine) Nanosorbents

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Redox Sorption and Recovery of Silver Ions as Silver Nanocrystals on Poly(aniline-co-5-sulfo-2-anisidine) Nanosorbents

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Xin-gui Huang, Mei-rong Feng, Hao
Description	Author Affiliation: Li XG ( Institute of Materials Chemistry, Key Laboratory of Advanced Civil Engineering Materials, College of Materials Science & Engineering, Tongji University, 1239 Si-Ping Road, Shanghai 200092, China. adamxgli@yahoo.com)
Abstract	Poly[aniline(AN)-co-5-sulfo-2-anisidine(SA)] nanograins with rough and porous structure demonstrate ultrastrong adsorption and highly efficient recovery of silver ions. The effects of five key factors—AN/SA ratio, $Ag^{I}$ concentration, sorption time, ultrasonic treatment, and coexisting ions—on $Ag^{I}$ adsorbability were optimized, and AN/SA (50/50) copolymer nanograins were found to exhibit much stronger $Ag^{I}$ adsorption than polyaniline and all other reported sorbents. The maximal $Ag^{I}$ sorption capacity of up to $2034 mg g^{−1}$ $(18.86 mmol g^{−1})$ is the highest thus far and also much higher than the maximal Hg-ion sorption capacity $(10.28 mmol g^{−1}).$ Especially at ≤2 mM $Ag^{I},$ the nanosorbents exhibit ≥99.98 % adsorptivity, and thus achieve almost complete $Ag^{I}$ sorption. The sorption fits the Langmuir isotherm well and follows pseudo-second-order kinetics. Studies by IR, UV/Vis, X-ray diffraction, polarizing microscopy, centrifugation, thermogravimetry, and conductivity techniques showed that $Ag^{I}$ sorption occurs by a redox mechanism mainly involving reduction of $Ag^{I}$ to separable silver nanocrystals, chelation between $Ag^{I}$ and $NH/N/NH_{2}/$ $SO_{3}H/OCH_{3},$ and ion exchange between $Ag^{I}$ and $H^{+}$ on $SO_{3}^{−}H^{+}.$ Competitive sorption of $Ag^{I}$ with coexisting Hg, Pb, Cu, Fe, Al, K, and Na ions was systematically investigated. In particular, the copolymer nanoparticles bearing many functional groups on their rough and porous surface can be directly used to recover and separate precious silver nanocrystals from practical $Ag^{I}$ wastewaters containing Fe, Al, K, and Na ions from Kodak Studio. The nanograins have great application potential in the noble metals industry, resource reuse, wastewater treatment, and functional hybrid nanocomposites.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	33
Volume Number	16
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2010-09-03
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Aniline Compounds Chemistry Metal Nanoparticles Adsorption Oxidation-Reduction Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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