纤维素
吸附
木质素
六价铬
吸附
纳米纤维
检出限
弗伦德利希方程
化学工程
碳纤维
铬
化学
多孔性
核化学
材料科学
荧光
纳米技术
碳纳米管
碳纳米纤维
有机化学
色谱法
复合材料
复合数
物理
工程类
量子力学
作者
Hanmeng Yuan,Junwen Peng,Tingting Ren,Q.-Y. Luo,Yonghong Luo,Ning Zhang,Yong Huang,Xin Guo,Yiqiang Wu
标识
DOI:10.1016/j.scitotenv.2020.143395
摘要
A novel fluorescent lignin-based hydrogel with cellulose nanofibers and carbon dots (CDs) was synthesized for the high-value utilization of lignin and control of hexavalent chromium (Cr(VI)). Its chemical and physical structure was characterized, and its Cr(VI) sorption performance was evaluated. The results demonstrated that 3D porous structures were constructed in this hydrogel. The maximum adsorption capacity of this hydrogel was 599.9 mg/g, and its sorption performance met Freundlich and pseudo-second-order models. Meanwhile, this novel hydrogel exhibited high sensitivity to Cr(VI), with a limit of detection of 11.2 mg/L and a wide linear range from 15 to 200 mg/L. Moreover, its mechanism for efficiently adsorbing and detecting Cr(VI) was analyzed. The results confirmed that the efficient adsorption and detection were due to these 3D porous structures generated by the lignin and cellulose nanofibers modified with CDs. The porous structures provided many active sites and ion transport channels, thereby improving the adsorption, and stabilized the fluorescence signal, thus enhancing the detection.
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