Investigation on electron donors for Cr(VI) reduction on surface of modified biomass adsorbent

被引：0
|
作者：
Cao W. [1 ]
Wang Z. [1 ]
Ao H. [1 ]
Yuan B. [1 ]
Zhou Z. [1 ]
Chen X. [1 ]
机构：
[1] College of Civil Engineering, Huaqiao University, Xiamen
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2019年 / 49卷 / 03期
关键词：
Adsorption; Cr(VI); Electron donors; Modified corn stalk; Reduction transformation;
D O I：
10.1360/N092018-00162
中图分类号：
学科分类号：
摘要：
In this work, modified corn stalk (CS-AE) was used as model adsorbent to study the electron donor groups involved in Cr(VI) reduction to Cr(III) during adsorption process in aqueous solution. Batch adsorption experiments showed the formation of Cr(III) both in liquid solution and solid adsorbent. Approximately 10%-35% adsorbed Cr(VI) was reduced to Cr(III), and most (> 65%) of formed Cr(III) was bound to CS-AE. X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance (13C-NMR) and Fourier transform-infrared spectroscopy (FT-IR) were employed to characterize surface element composition and functional groups of CS-AE. XPS characterization showed that N content in CS-AE surface decreased after reaction with Cr(VI) as well as the relative content of quaternary ammonium groups, indicating quaternary ammonium group was oxidized by Cr(VI) as electron donors. 13C-NMR and FT-IR also found that the decrease of quaternary ammonium groups and a little increase of carboxylic groups. Determination results of total organic carbon (TOC), total nitrogen (TN) and nitrate (NO3--N) in adsorption solution suggested that TN, NO3--N, TOC content increased with initial Cr(VI) concentration and exhibited positive correlations with the production of Cr(III) (P<0.05). This implied the possible oxidation pathways of quaternary ammonium by Cr (VI) included the break of C-N linkage between quaternary ammonium and CS-AE structure followed by the formation of organic amine which was subsequently oxidized to nitrate in solution. © 2019, Science Press. All right reserved.
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页码：301 / 310
页数：9
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