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In situ preparation of 'Cr-keeper' nanoparticles - Separation of trace vanadium (V) from chromium (VI) in aqueous solution

机译:原位制备“Cr-keeper”纳米粒子 - 水溶液中铬(VI)中痕量钒(V)的分离

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摘要

"Cr-keeper" nanoparticles (CKN) are in-situ synthesized based on the challenge of separation trace vanadium (V) from chromium (VI) in aqueous solution. Kelp is used as the bio-template and it can react with chromium (VI). Transmission electron microscopy (TEM) results reveal that CKN can copy the cell structure from kelp and the specific surface area of CKN is 343.20 m(2)/g. Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analysis confirm the formation of hydroxyl and Cr (III) species in CKN. The adsorption capacity of V (V) onto CKN is 51.20 mg/g and the maximum separation coefficient (beta(V/Cr) = 3900) is achieved at pH 3.00. The adsorption kinetics follow pseudo-first-order model and Weber-Morris intra particle diffusion model. The adsorption isotherms follow the Sips model. The regeneration and reusability of CKN are discussed. All the results suggest that the utilization of biomass's cell structure as the template for the fabrication of adsorbent with "Cr-keeper" function is excellent, which will bring new directions for Cr (VI) system purification. (C) 2017 Elsevier B.V. All rights reserved.
机译:“Cr-keeker”纳米颗粒(CKN)是基于水溶液中分离痕量钒(V)的分离痕量钒(V)的原位合成。海藻用作生物模板,它可以与铬(VI)反应。透射电子显微镜(TEM)结果表明,CKN可以从海带复制细胞结构,CKN的比表面积为343.20 m(2)/ g。傅里叶变换红外(FT-IR)和X射线光电子能谱(XPS)分析证实了CKN中羟基和Cr(III)种的形成。 V(v)对CKN的吸附容量为51.20mg / g,并且在pH 3.00下实现最大分离系数(β(v / cr)= 3900)。吸附动力学遵循伪第一阶模型和Weber-Morris intra粒子扩散模型。吸附等温线遵循啜饮模型。讨论了CKN的再生和可重用性。所有结果表明,利用生物质的细胞结构作为制造具有“CR-Keeper”功能的吸附剂的模板是优异的,这将为CR(VI)系统纯化带来新的方向。 (c)2017 Elsevier B.v.保留所有权利。

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