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Cryogel-based Ag°/Ag2O nanocomposites for iodide removal from water
Journal of Molecular Liquids ( IF 5.065 ) Pub Date : 2019-11-15 , DOI: 10.1016/j.molliq.2019.112134
A.Zh. Baimenov,D.A. Berillo,V.J. Inglezakis

In this study novel silver-modified cryogels were synthesized and applied for the removal of iodide from aqueous solutions. The co-allylamine-methacrylic acid-DMAAm-BisAAm (AAC) and co-allylamine-2-acrylamido-2-methyl-1-propansulfonic acid-DMAAm-BisAAm (SAC) cryogels were decorated with silver by one-step ion-exchange technique and characterized by TEM/EDS, SEM/EDS, FT-IR, XRD and zeta potential measurements. The silver loading was up to 159 and 98 mg/g for AAC and SAC cryogel nanocomposites, respectively. The silver is found in the structure of cryogels in the form of Ag2O and Ag° nanoparticles and the formation of metallic silver is attributed to in situ reduction of silver by the functional groups of the cryogels. The nanocomposites showed rapid kinetics and high adsorption capacity towards iodide. The equilibrium studies showed that the removal of iodide is higher than the theoretically expected based on the Ag:I molar ratio of 1:1. The analysis of the surface of the cryogels confirmed the theoretical Ag:I molar ratio and a study of the solution phase revealed that small amounts of leached Ag+ from the cryogels resulted in the formation of AgI colloids which, under the conditions of the experiments, exhibit Ag:I molar ratios lower than the theoretical value explaining the discrepancies between the theoretical and actual iodide removal rates.



中文翻译:

基于Cryogel的Ag°/ Ag 2 O纳米复合材料,用于从水中去除碘化物

在这项研究中,合成了新型的银改性冰晶,并用于从水溶液中去除碘化物。通过一步离子交换用银修饰共烯丙基胺-甲基丙烯酸-DMAAm-BisAAm(AAC)和共烯丙基胺-2-丙烯酸酰胺基-2-甲基-1-丙磺酸-DMAAm-BisAAm(SAC)冷冻凝胶。技术,并通过TEM / EDS,SEM / EDS,FT-IR,XRD和zeta电位测量进行表征。对于AAC和SAC冷冻凝胶纳米复合材料,银负载量分别高达159和98 mg / g。银以Ag 2的形式存在于冰晶结构中O和Ag°纳米粒子以及金属银的形成归因于冰晶凝胶的官能团原位还原银。纳米复合材料显示出快速的动力学和对碘化物的高吸附能力。平衡研究表明,碘的去除率高于基于Ag:I摩尔比为1:1的理论值。对晶格表面的分析证实了理论上的Ag:I摩尔比,对溶液相的研究表明,从晶格中少量浸出的Ag +导致形成了AgI胶体,在实验条件下,表现出的Ag:I摩尔比低于理论值,这说明了理论和实际碘化物去除率之间的差异。

更新日期:2019-11-18
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