Abstract

Cellulose, due to its low cost, abundance, and biodegradability, has been considered a good choice of support gold nanoparticles (AuNPs). AuNPs based nanomaterials are efficient catalysts for many reactions, including the 4-nitrophenol (4-NP) reduction, which is used in many preparations of chemical and pharmaceutical industries and has toxic effects in living organisms. The cellulose film containing gold nanoparticles was prepared by spin coating a viscous solution of dissolved microcrystalline cellulose in 1-butyl-3-methylimidazolium chloride, followed by regeneration of the cellulose matrix as a film with water addition. Then, the as-prepared film was immersed in an aqueous dispersion of AuNPs, resulting in a red film containing AuNPs with diameters around 10 nm homogeneously dispersed in the polymeric matrix. This film showed great catalytic activity for the reduction of 4-NP to 4-aminophenol using NaBH₄, and it was efficient during five cycles. The catalyst prepared in this study has the advantage of being easily isolated from the reaction medium, avoiding processes of centrifugation or filtration for isolation and reuse.

Graphic abstract

摘要

纤维素由于其低成本，丰富和可生物降解性，被认为是支持金纳米颗粒（AuNPs）的不错选择。基于AuNPs的纳米材料是许多反应的有效催化剂，包括4-硝基苯酚（4-NP）还原反应，该反应用于许多化学和制药行业的制剂中，并且对生物体具有毒性作用。通过将溶解的微晶纤维素的粘性溶液旋涂在氯化1-丁基-3-甲基咪唑鎓中，然后通过添加水使纤维素基质再生为薄膜，来制备包含金纳米颗粒的纤维素薄膜。然后，将所制备的膜浸入AuNPs的水分散体中，得到包含直径约10nm的AuNPs的红色膜均匀分散在聚合物基质中。₄，并且在五个周期内都很有效。本研究中制备的催化剂具有易于从反应介质中分离的优点，避免了离心分离或再利用的过滤或过滤过程。

图形摘要