Utilization and functionalization of waste derived lignin is an emerging subject in the new century to mitigate energy crisis and climate changes. In this study, an innovative Lignin-Porphyrin Nano-Particle (Lignin-TPP) was synthesized to extend the values of Kraft lignin. Lignin is a three-dimensional amorphous complex consists of various amount and types of functional groups, <i>e.g</i>., phenolic hydroxyl, aliphatic hydroxyl, carbonyl, and methyl, providing superior functionality on pH reponsive, UV absorbance, and amphiphilicity. Porphyrin is a well-known functional macrocycle according to the degree of interactions. With external stimuli and other molecules, this compound can be applied optical detection and sensing application under certain conditions. Combining the special functionalities of the two chemicals, Lignin-TPP was synthesized and showed at various conditions to extend their applications. Lignin-TPP demonstrated outstanding feature which cannot be provided by the original chemicals alone. Fluorescence study showed that the emission intensity of Lignin-TPP is significantly enhanced during applied in high-water fraction (&gt;90%) environments. Immobilization of porphyrin on lignin can effectively overcome the impacts from aggregation-caused quenching. Lignin-TPP showed its potentials in bio-imaging for its stable emission at a broad range of pH in red and NIR fluorescence region, which is also sensitive to different types and concentrations of heavy metals in aquatic environment. The concept and synthetic approach create addition values to biorefinery for wood based polymer valorization.

Synthesis of lignin-porphyrin nano-particles to perform fluorescence enhancement at high water fraction with broad pH range and heavy metals sensor applications

2019 Spring National Meeting

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