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首页> 外文期刊>Chemistry: A European journal >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

机译：聚苯胺-co-5-磺基-2-茴香胺纳米吸附剂对银离子作为银纳米晶体的氧化还原吸附和回收

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摘要

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 mgg ~(-1) (18.86 mmolg ~(-1)) is the highest thus far and also much higher than the maximal Hg-ion sorption capacity (10.28 mmolg ~(-1)). Especially at ≤2mm 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_3H/-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.
机译：具有粗糙和多孔结构的聚[苯胺（AN）-co-5-磺基-2-茴香胺（SA）]纳米颗粒显示出超强的吸附能力和高效的银离子回收率。优化了AN / SA比，Ag〜I浓度，吸附时间，超声处理和共存离子这五个关键因素对Ag〜I吸附性能的影响，发现AN / SA（50/50）共聚物纳米颗粒具有良好的吸附性能。与聚苯胺和所有其他报道的吸附剂相比，Ag〜I的吸附能力强得多。高达2034 mgg〜（-1）（18.86 mmolg〜（-1））的最大Ag〜I吸附容量是迄今为止最高的，也远高于最大的Hg离子吸附容量（10.28 mmolg〜（-1） ））。尤其是在≤2mm Ag〜I时，纳米吸附剂表现出≥99.98％的吸附性，因此几乎实现了完全的Ag〜I吸附。吸附非常适合Langmuir等温线，并遵循拟二级动力学。通过IR，UV / Vis，X射线衍射，偏光显微镜，离心，热重分析和电导率技术进行的研究表明，Ag〜I的吸附是通过氧化还原机理发生的，该机理主要涉及将Ag〜I还原为可分离的银纳米晶体，Ag〜之间的螯合。 I和-NH-/-N = /-NH _2 / -SO_3H / -OCH_3，以及在-SO_3〜-H〜+上Ag〜I和H〜+之间的离子交换。系统研究了Ag〜I与Hg，Pb，Cu，Fe，Al，K和Na离子共存的竞争吸附。特别地，在其粗糙和多孔表面上带有许多官能团的共聚物纳米颗粒可直接用于从柯达工作室的含有Fe，Al，K和Na离子的实际Ag〜I废水中回收和分离珍贵的银纳米晶体。纳米颗粒在贵金属行业，资源再利用，废水处理和功能性杂化纳米复合材料中具有巨大的应用潜力。

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