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首页> 外文期刊>Chemistry: A European journal >Strong Adsorbability of Mercury Ions on Aniline/Sulfoanisidine Copolymer Nanosorbents
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Strong Adsorbability of Mercury Ions on Aniline/Sulfoanisidine Copolymer Nanosorbents

机译：汞离子在苯胺/磺基茴香胺共聚物纳米吸附剂上的强吸附性

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摘要

Poly(aniline (AN)-co-5-sulfo-2-anisidine (SA)) nanoparticles were synthesized by chemical oxidative copolymerization of AN and SA monomers, and their extremely strong adsorption of mercury ions in aqueous solution was demonstrated. The reactivity ratios of AN and SA comonomers were found to be 2.05 and 0.02, respectively. While AN monomer tends to homopolymerize, SA monomer tends to copolymerize with AN monomer because of the great steric hindrance and electron-attracting effect of the sulfo groups, despite the effect of conjugation of the methoxyl group with the benzene ring. The effects of initial mercury(II) concentration, sorption time, sorption temperature, ultrasonic treatment, and sorbent dosage on mercuryion sorption onto AN/SA (50/50) copolymer nanoparticles with a number-average diameter of around 120 nm were significantly optimized. The results show that the maximum fig-ion sorption capacity on the particulate nanosorbents can even reach 2063 mg of Hg per gram of sorbent, which would be the highest Hg-ion adsorbance so far. The sorption data fit to the Langmuir isotherm, and the process obeys pseudo-second-order kinetics. The IR and UV/Vis spectral data of the Hg-loaded copolymer particles suggest that some mercury(II) was directly reduced by the copolymer to mercury(I) and even mercury(0). A mechanism of sorption between the particles and fig ions in aqueous solution is proposed, and a physical/ion exchange/chelation/redox sorption ratio of around 2/3/45/50 was found. Copolymer nanoparticles may be one of the most powerful and cost-effective sorbents of mercury ions, with a wide range of potential applications for the efficient removal and even recovery of the mercury ions from aqueous solution.
机译：通过AN和SA单体的化学氧化共聚反应合成了聚苯胺（AN）-co-5-磺基-2-茴香胺（SA）纳米颗粒，证明了它们在水溶液中对汞离子的极强吸附性。发现AN和SA共聚单体的反应性比分别为2.05和0.02。尽管有甲氧基与苯环的共轭作用，但是由于磺基的巨大的位阻和电子吸引作用，尽管AN单体倾向于均聚，但SA单体倾向于与AN单体共聚。显着优化了初始汞（II）浓度，吸附时间，吸附温度，超声处理和吸附剂用量对汞离子吸附到数均直径约为120 nm的AN / SA（50/50）共聚物纳米颗粒上的影响。结果表明，在颗粒状纳米吸附剂上最大的离子吸附能力甚至可以达到每克吸附剂2063 mg Hg，这是迄今为止最高的Hg离子吸附率。吸附数据符合Langmuir等温线，该过程服从拟二级动力学。负载汞的共聚物颗粒的红外和紫外/可见光谱数据表明，某些汞（II）被共聚物直接还原为汞（I）甚至汞（0）。提出了水溶液中粒子与无花果离子之间的吸附机理，发现物理/离子交换/螯合/氧化还原吸附率约为2/3/45/50。共聚物纳米颗粒可能是汞离子最强大和最具成本效益的吸附剂之一，具有从水溶液中有效去除甚至回收汞离子的广泛潜在应用。

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