Lignin is a versatile bioaromatic polymer, with great potentials in the preparation of advanced materials due to its anti-UV and anti-oxidant properties. However, the high heterogeneity of lignin seriously hinders its practical applications. In this study, alkali lignin with limited content of hydroxyl groups and a wide distribution of molecular weight was modified by selective phenolation, which not only resulted in a dramatical increase in the content of phenolic hydroxyl groups but also led to a more uniform structure of lignin. Catechol, as compared with phenol and pyrogallol, was the most suitable phenolation reagent to reacted with lignin, and the phenolic hydroxyl content of the catechol modified lignin increased by 318.89%. Besides, the molecular weight and polydispersity index of lignin after the modification decreased, which led to a small and regular size of lignin particles prepared by acid precipitation. Subseqently, lignin particles were used to prepare Pickering emulsions for avermectin (AVM) encapsulation, and the stability as well as the anti-UV and anti-oxidant capacities of Pickering emulsions prepared by using phenolated lignins as solid surfactants were obviously enhanced. The encapsulation efficiency of AVM in Pickering emulsions was also improved, which could reach high above 90%. Moreover, AVM protected by lignin-based Pickering emulsion could be controllably released in line with actual application demands, and the relatively high viscosity of emulsion could effectively avoid the loss of pesticide during spraying to the target.

木质素是一种多功能的生物芳香聚合物，由于其抗紫外线和抗氧化特性，在制备先进材料方面具有巨大潜力。然而，木质素的高异质性严重阻碍了其实际应用。本研究通过选择性酚化对羟基含量有限、分子量分布较宽的碱性木质素进行改性，不仅使酚羟基含量显着增加，而且使木质素结构更加均匀。 . 与苯酚和邻苯三酚相比，邻苯二酚是最适合与木质素反应的酚化试剂，邻苯二酚改性木质素的酚羟基含量提高了318.89%。此外，改性后木质素的分子量和多分散指数降低，这导致通过酸沉淀制备的木质素颗粒小而规则尺寸。随后，利用木质素颗粒制备了用于阿维菌素（AVM）包封的Pickering乳液，以酚化木质素为固体表面活性剂制备的Pickering乳液的稳定性以及抗紫外线和抗氧化能力明显增强。AVM在Pickering乳液中的包封率也有所提高，可达90%以上。此外，木质素Pickering乳液保护的AVM可以根据实际应用需求进行可控释放，乳液较高的粘度可以有效避免农药在喷洒到目标过程中的损失。将木质素颗粒用于制备用于阿维菌素（AVM）包封的Pickering乳液，以酚化木质素为固体表面活性剂制备的Pickering乳液的稳定性和抗紫外线、抗氧化能力明显增强。AVM在Pickering乳液中的包封率也有所提高，可达90%以上。此外，木质素Pickering乳液保护的AVM可以根据实际应用需求进行可控释放，乳液较高的粘度可以有效避免农药在喷洒到目标过程中的损失。将木质素颗粒用于制备用于阿维菌素（AVM）包封的Pickering乳液，以酚化木质素为固体表面活性剂制备的Pickering乳液的稳定性和抗紫外线、抗氧化能力明显增强。AVM在Pickering乳液中的包封率也有所提高，可达90%以上。此外，木质素Pickering乳液保护的AVM可以根据实际应用需求进行可控释放，乳液较高的粘度可以有效避免农药在喷洒到目标过程中的损失。酚化木质素作为固体表面活性剂制备的Pickering乳液的稳定性和抗紫外线、抗氧化能力明显增强。AVM在Pickering乳液中的包封率也有所提高，可达90%以上。此外，木质素Pickering乳液保护的AVM可以根据实际应用需求进行可控释放，乳液较高的粘度可以有效避免农药在喷洒到目标过程中的损失。酚化木质素作为固体表面活性剂制备的Pickering乳液的稳定性和抗紫外线、抗氧化能力明显增强。AVM在Pickering乳液中的包封率也有所提高，可达90%以上。此外，木质素Pickering乳液保护的AVM可以根据实际应用需求进行可控释放，乳液较高的粘度可以有效避免农药在喷洒到目标过程中的损失。