发光学报, 2019, 40 (3): 304, 网络出版: 2019-06-10   

Mn掺杂ZnS量子点与孔雀石绿和隐性孔雀石绿的相互作用

作者单位
湖北省农业科学院 农业质量标准与检测技术研究所, 湖北 武汉 430064
摘要
研究了Mn掺杂ZnS量子点与孔雀石绿和隐性孔雀石绿的相互作用。首先采用水热法以壳聚糖为基质, 利用成核掺杂原理制备量子点, 然后分别采用紫外-可见吸收和荧光光谱技术研究了量子点与孔雀石绿和隐性孔雀石绿的相互作用。结果表明, 向初始浓度为20 mg·L-1孔雀石绿溶液中加入200 mg·L-1量子点, 60 min孔雀石绿的去除率约为82%, 量子点可以光催化降解孔雀石绿, 其反应过程符合假一级动力学的假设; 量子点对隐性孔雀石绿具有荧光猝灭作用, 猝灭作用为动态猝灭, 相互作用力为氢键和范德华力, 吉布斯自由能小于零, 量子点与隐性孔雀石绿的相互作用是一个自发的过程。因此, 量子点可以用于光催化降解孔雀石绿和快速无毒检测隐性孔雀石绿。
Abstract
The interaction of Mn doped ZnS quantum dots with malachite green and its metabolites residues leucomalachite green were studied. Firstly, chitosan coated ZnS∶Mn quantum dots were prepared and characterized. Then, the interactions of the quantum dots to malachite green and leucomalachite green were investigated by ultraviolet-visible and fluorescence spectra. It was found that the quantum dots have a photocatalytic degradation effect on malachite green. After illumination for 60 min, the removal efficiency of malachite green with initial concentration of 20 mg·L-1 by 200 mg·L-1 quantum dots reached nearly 82%. The process kinetics can be successfully fitted to the first order kinetics of Langmuir-Hinshelwood model. The fluorescence intensity of leucomalachite green was quenched by the quantum dots. The dominating quenching mechanism belongs to dynamic quenching. Hydrogen bonding and van der Waals force play major role; binding processes are spontaneous. The results show that the quantum dots are promising candidates for applications in photocatalytic degradation of malachite green and non-toxic detecting leucomalachite green.

刘丽, 彭茂民, 夏虹. Mn掺杂ZnS量子点与孔雀石绿和隐性孔雀石绿的相互作用[J]. 发光学报, 2019, 40(3): 304. LIU Li, PENG Mao-min, XIA Hong. [J]. Chinese Journal of Luminescence, 2019, 40(3): 304.

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