Green and Facile Preparation of Regular Lignin Nanoparticles with High Yield and Their Natural Broad-Spectrum Sunscreens,ACS Sustainable Chemistry & Engineering

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Green and Facile Preparation of Regular Lignin Nanoparticles with High Yield and Their Natural Broad-Spectrum Sunscreens
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-12-25 00:00:00 , DOI: 10.1021/acssuschemeng.8b05735
Bing Wang ₁ , Dan Sun ₁ , Han-Min Wang ₁ , Tong-Qi Yuan ₁ , Run-Cang Sun ₁

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Lignin nanoparticles offer a way for a high value use of the renewable resources. However, there are few green and facile methods so far for producing lignin nanoparticles with both high yield and regular shape. In this study, lignin was first modified through a microwave acetylation process without any catalysts and solvents other than acetic anhydride, which acted as both reaction reagent and dispersion solvent. Subsequently, the regular lignin nanoparticles with a high yield were prepared by a solvent shifting combined ultrasound process. The lignin nanoparticles were rapidly formed without dialysis and easily separated by centrifugation; meanwhile, the used THF could be recycled and reused, which would simplify the process, reduce the cost, and realize the industrial scale-up production. The highest yield of lignin nanoparticles reached to 82.3% as the lignin initial concentration and the ultrasound intensity increased. Meanwhile, the ultrasound treatment improved the uniformity and dispersion of the nanoparticles. The structure transformation and the forming mechanism of lignin nanoparticles were investigated through various techniques. Furthermore, the UV absorbing ability of lignin nanoparticles was examined. In a more general plan, it was confirmed that the green chemistry principles could be realized in the development of more sustainable lignin nanomaterials with various potential applications.

中文翻译：

绿色高产常规木质素纳米颗粒的简便制备及其天然广谱防晒霜。

木质素纳米颗粒为高价值利用可再生资源提供了一种途径。然而，到目前为止，几乎没有绿色和简便的方法来生产既具有高产率又具有规则形状的木质素纳米颗粒。在这项研究中，木质素首先通过微波乙酰化工艺进行了修饰，除了乙酸酐以外，没有任何催化剂和溶剂，乙酸酐既充当反应试剂，又充当分散溶剂。随后，通过溶剂转移组合超声工艺制备了高产率的常规木质素纳米颗粒。木质素纳米颗粒无需透析即可快速形成，并且易于通过离心分离。同时，用过的四氢呋喃可以回收再利用，简化了工艺，降低了成本，实现了工业规模化生产。木质素纳米颗粒的最高产量达到82。木质素的初始浓度和超声强度增加时为3％。同时，超声处理改善了纳米颗粒的均匀性和分散性。通过多种技术研究了木质素纳米颗粒的结构转变和形成机理。此外，检查了木质素纳米颗粒的UV吸收能力。在更一般的计划中，已确认绿色化学原理可以在具有多种潜在应用的更可持续的木质素纳米材料的开发中实现。通过多种技术研究了木质素纳米颗粒的结构转变和形成机理。此外，检查了木质素纳米颗粒的UV吸收能力。在更一般的计划中，已确认绿色化学原理可以在具有多种潜在应用的更可持续的木质素纳米材料的开发中实现。通过多种技术研究了木质素纳米颗粒的结构转变和形成机理。此外，检查了木质素纳米颗粒的UV吸收能力。在更一般的计划中，已确认绿色化学原理可以在具有多种潜在应用的更可持续的木质素纳米材料的开发中实现。

更新日期：2018-12-25

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