吸附
纤维素
纳米纤维
傅里叶变换红外光谱
纳米纤维素
扫描电子显微镜
核化学
木质素
Mercury(编程语言)
化学工程
材料科学
化学
比表面积
有机化学
纳米技术
复合材料
计算机科学
工程类
程序设计语言
催化作用
作者
Hui Chen,Sunil K. Sharma,Priyanka R. Sharma,Kai Chi,Eric Fung,Katherine B. Aubrecht,Ngonye Keroletswe,Samuel Chigome,Benjamin S. Hsiao
出处
期刊:Cellulose
[Springer Nature]
日期:2021-07-14
卷期号:28 (13): 8611-8628
被引量:25
标识
DOI:10.1007/s10570-021-04057-5
摘要
Mercury contamination in drinking water is a worldwide problem due to its severely harming effects on the human body. A nanostructured natural bioadsorbent, carboxycellulose nanofiber extracted from raw moringa plant using the nitro-oxidation method (termed NOCNF), capable of effectively remediating this problem has been demonstrated. Nitro-oxidation is a simple approach that can extract carboxylated nanocellulose directly from raw biomass. In this study, the produced NOCNF contained a large density of carboxylate groups on the cellulose surface (0.97 mmol/g), capable of removing Hg2+ ions by simultaneous electrostatic-interactions and mineralization processes. Using the Langmuir analysis, the adsorption results indicated that the highest Hg2+ removal capacity of this NOCNF was 257.07 mg/g, which is higher than most of the reported values. The interactions between Hg2+ and NOCNF were further characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), transmission electron microscopy with electron diffraction and wide-angle X-ray diffraction methods, suggesting the existence of two distinct removal mechanisms: predominant adsorption at low Hg2+concentrations (< 250 ppm) and predominant mineralization at high Hg2+ concentrations (> 1000 ppm). The applications of NOCNF were illustrated in both suspension form, as an adsorbent/coagulant, and dry powder form using filtration column. The results indicated that NOCNF in suspension exhibited a higher maximum removal efficiency of 81.6% as compared to the dry state of 74.3%. This work demonstrated the feasibility of extracting nanostructured adsorbents from biomass feedstocks to tackle the Hg2+ contamination problem in drinking water. Cellulose nanofibers, extracted from Moringa plant using the nitro-oxidation method, exhibit excellent adsorption capacity for Mercury (II) removal.
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