木质素磺酸钙-石墨烯复合量子点的制备及性能

木质素磺酸盐是造纸工业主要副产物之一，本文利用木质素磺酸钙和柠檬酸为原料通过绿色简便的原位反应制备木质素磺酸钙/石墨烯复合量子点，利用荧光光谱、紫外可见光谱和透射电镜等研究了复合量子点的光学性能、结构模型和对金属离子的选择性吸附性能，结果表明该复合量子点的荧光强度是石墨烯量子点的4倍多，并且复合量子点可以选择性识别Fe³⁺，在10～500μmol/L范围内，Fe³⁺的浓度与复合量子点溶液的荧光强度有良好的线性关系，可应用于Fe³⁺的检测。此荧光探针制备简便，成本低廉，检测铁离子速度快，准确性高，选择性好，在离子检测方面有潜在的应用价值。

Synthesis and properties of lignin/graphene quantum dots composites as fluorescent sensor

Ligninsulfonates are byproducts of the sulfite-pulping procedure. In this paper, we prepared CSL/GQDs composites by uni-form modification the GQDs with lignosulfonate calcium (CSL) via in-situ reaction in a green and facile preparative route. This article uses fluorescence spectroscopy、UV-vis spectra and TEM to investigate the optical properties, the molecular structure and the ion detection of composites. The composites exhibit strong fluorescence emission and nice selectivity which is dramatically enhanced as high as four times that of the free GQDs. The prepared sensor allows high sensitivity and specificity toward Fe³⁺ analysis and presents a good linearity in range of 10-500μmol/L. Furthermore, this fluorescent probe preparation is simple, low cost, and highly sensitive and specific toward Fe³⁺ analysis.