Li Lei, Wang Feijun, Lv Yanyan, Liu Jianxin, Bian Hongli, Wang Wenjun, Li Yonghong, Shao Ziqiang
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
Beijing Engineering Research Centre of Cellulose and Its Derivatives, Beijing 100081, China.
ACS Omega. 2018 Apr 16;3(4):4220-4230. doi: 10.1021/acsomega.7b01969. eCollection 2018 Apr 30.
This paper reports the carbon quantum dots-doped magnetic electrospinning nanofibers for the self-display and removal of Hg(II) ions from water. The fluorescent carbon quantum dots and magnetic FeO nanoparticles were pre-prepared successfully, and they appeared to be homogeneously dispersed in nanofibers via electrospinning. During the sorption of Hg(II) ions, the significant fluorescence signals of nanofibers gradually declined and exhibited a good linear relationship with cumulative adsorption capacity, which could be easily recorded by the photoluminescence spectra. The sorption performance of mercury ions onto the nanofibers was investigated in terms of different experimental factors including contact time, solution pH value, and initial ion concentration. Considering the actual parameters, the nanofibers were sensitive self-display adsorption system for Hg(II) ions in the existence of other cation. The sorption data were described by different kinetic models, which indicate that the whole sorption was controlled by chemical adsorption. The intraparticle diffusion mass transfer was not obvious in this system, which further proved the uniform adsorption and even fluorescence quenching in nanofibers. Additionally, the nanocomposite fiber could regenerate in several cycles with no significant loss of adsorption capacity and fluorescence intensity. Thus, the nanofibers are promising alternatives for environmental pollution incidents. It is especially competent due to its high efficiency for self-display and removal of high concentration of mercury ions.
本文报道了用于水中汞（II）离子自显示和去除的碳量子点掺杂磁性静电纺丝纳米纤维。成功预先制备了荧光碳量子点和磁性FeO纳米颗粒，并且它们似乎通过静电纺丝均匀地分散在纳米纤维中。在汞（II）离子的吸附过程中，纳米纤维的显著荧光信号逐渐下降，并且与累积吸附容量呈现良好的线性关系，这可以通过光致发光光谱轻松记录。从接触时间、溶液pH值和初始离子浓度等不同实验因素方面研究了汞离子在纳米纤维上的吸附性能。考虑到实际参数，纳米纤维在存在其他阳离子的情况下是用于汞（II）离子的灵敏自显示吸附系统。吸附数据由不同的动力学模型描述，这表明整个吸附过程受化学吸附控制。在该系统中颗粒内扩散传质不明显，这进一步证明了纳米纤维中吸附的均匀性和荧光猝灭的均匀性。此外，纳米复合纤维可以在几个循环中再生，吸附容量和荧光强度没有明显损失。因此，纳米纤维是环境污染事件的有前途的替代物。由于其对高浓度汞离子的高效自显示和去除能力，它特别胜任。
