Method for extracting visible light response natural dye from orychophragmus violaceus leaves

Abstract

The invention discloses a method for extracting visible light response natural dye from orychophragmus violaceus leaves. The method comprises the following steps: separating leaves of orychophragmus violaceus plants from plants, drying, grinding and crushing the dried leaves, soaking the leaf powder in an acetone/ethanol mixed solvent under a dark and airtight condition, and filtering to obtain the visible light response natural dye. The acetone/ethanol mixed solvent is used as the extraction solvent, the natural dye in the orychophragmus violaceus raw material is extracted by utilizing the similar compatibility of the acetone/ethanol mixed solvent to the natural dye, and compared with pure solvents of ethanol and acetone, the extraction effect is better, the extraction time is shortened to 2 hours, and the extraction efficiency is improved. The extracted visible light response natural dye has high absorption intensity in a visible spectrum range.

Description

technical field [0001] The invention belongs to the technical field of extraction of natural dyes, and relates to a method for extracting natural dyes responding to visible light in leaves of Erzuli orchid. Background technique [0002] Dye-sensitized solar cells (DSSCs) are a new type of photoelectrochemical solar cells, which have more significant advantages compared with traditional silicon cells, such as low cost, simple manufacturing process, stable performance, and more environmentally friendly. DSSCs are designed according to photosynthesis in nature. The working principle is mainly that dye molecules absorb natural visible light to excite photoelectrons, and can supply power to external loads when passing through the loop. Therefore, the quality of dye sensitizers has a decisive effect on the working efficiency of batteries. . [0003] At present, most of the dyes used in DSSCs use various complexes of ruthenium. The organic ruthenium complexes synthesized by Gong ...

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Problems solved by technology

Existing studies mostly use plateau natural dyes, such as Wang Bing’an, Yang Guijun and others use plateau black wolfberry and spinach leaves to extract anthocyanins and chlorophyll respectively, but they also face problems such as poor pertinence of extraction methods and solvents, and long extraction time (Wang Bing’an, Yang Guijun , Chen Huiyuan. Application of anthocyanin and chlorophyll co-sensitizing dyes in plateau natural dye-sensitized solar cells [J]. Journal of Qinghai Normal University (Natural Science Edition), 2018, (01): 26-31.)

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