应用麦麸制备的生物炭作为薄膜扩散梯度技术中的结合相,测定天然水体中的汞含量

IF 2.2 4区 化学 Q2 Engineering Chemical Papers Pub Date : 2024-08-11 DOI:10.1007/s11696-024-03635-8
Jakub Křikala, Pavel Diviš, Jaromír Pořízka, Eva Duborská, Martin Gajdušek
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引用次数: 0

摘要

研究人员开发了一种用于 DGT 技术的新型结合凝胶,其中含有通过热解麦麸产生的生物炭。研究结果表明,麦麸生物炭(WBBC)是一种多孔材料,表面积为 25 m2/g。经鉴定,麦麸生物炭表面的主要官能团是羰基,但也检测到一些羟基和亚氨基。此外,研究结果表明,由于汞对氯离子有很高的亲和力,因此离子强度的增加(尤其是在氯化钠溶液中)会显著影响汞在 WBBC 上的积累。DGT 与 WBBC 结合凝胶的性能也受溶液 pH 值的影响,WBBC 应用的最佳 pH 值范围为 3-7。根据基质环境的不同,汞的扩散系数在 5.44 和 6.99 × 10-6 cm2/s 之间变化。将新设计的 DGT 技术应用于加标河水样本时,R 值达到了 0.68。这项工作的结果证明,改进后的 DGT 技术可以对盐度较低的天然水体中的汞进行经济有效的分析,同时保留了结合凝胶的基本特性,即结合了带有锚定功能基团的颗粒吸附剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Application of biochar prepared from wheat bran as the binding phase in diffusive gradient in thin films technique for determination of mercury in natural waters

A novel binding gel for the DGT technique, containing biochar produced through the pyrolysis of wheat bran, was developed. The results of this study indicate that wheat bran biochar (WBBC) is a porous material with a surface area of 25 m2/g. The primary functional group on the surface of WBBC was identified as a carbonyl group, although some hydroxyl and imino groups were also detected. Furthermore, the findings demonstrate that the accumulation of Hg on WBBC was significantly influenced by an increase in ionic strength, particularly in NaCl solution, owing to Hg’s high affinity for chloride ions. The performance of the DGT with WBBC binding gel was also affected by solution pH, with the optimal pH for WBBC application falling within the range of 3–7. The diffusion coefficient of Hg, depending on the matrix environment, varied between 5.44 and 6.99 × 10−6 cm2/s. When applying the newly designed DGT technique to spiked samples of river water, an R value of 0.68 was achieved. The results of this work proved that modified DGT technique allows for a cost-effective analysis of Hg in natural waters with lower salinity, while retaining the fundamental properties of the binding gel incorporating a particulate adsorbent with anchored functional groups.

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来源期刊
Chemical Papers
Chemical Papers Chemical Engineering-General Chemical Engineering
CiteScore
3.30
自引率
4.50%
发文量
590
期刊介绍: Chemical Papers is a peer-reviewed, international journal devoted to basic and applied chemical research. It has a broad scope covering the chemical sciences, but favors interdisciplinary research and studies that bring chemistry together with other disciplines.
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