Functional Modification And Characterization Of Nanocellulose

Based on green chemical process of development,amidoxime surface functionalized bacterial cellulose?AOBC?has been successfully prepared by a simple two-step method without obviously changing the morphology of bacterial cellulose.AOBC has been used as the reducing agent and carrier for the synthesis of gold nanoparticles?AuNPs?to prepared nanocomposites?AOBC/AuNPs?.This study focused on AOBC/AuNPs of catalytic performance corresponds to the effects factors of reaction rate constant k,and through catalytic column of success preparation expects for development in the actual application.In this paper,the main research results obtained are as follows:AOBC has been successfully prepared by a simple two-step method.The optimum active time of bacterial cellulose in NaOH solution for preparing the gold nanoparticles was 7 h.AOBC has been used as the reducing agent and carrier for the synthesis of gold nanoparticles?AuNPs?to prepared nanocomposites?AOBC/AuNPs?under hydrothermal conditions.AOBC used as carrier for the synthesis of gold nanoparticles?AuNPs?that distributed homogeneously on the surface of the bacterial cellulose.The higher content in amidoxime groups in AOBC is benefit for the synthesis of AuNPs with smaller and more uniform in size.Meanwhile,we found the controlled synthesis of Au nanoparticles along the fiber's growth with adjustable sizes?50nm-1?m?.The AOBC/AuNPs nanohybrids have the excellent catalytic activity for the reduction of 4-nitrophenol?4-NP?by using NaBH₄.It was found that the catalytic activity of the AOBC/AuNPs nanohybrids first increases with the increasing NaBH₄ concentration and the temperature,and then levelled off at the NaBH₄ concentration above 264 mM and temperature above 50°C.Moreover,AuNPs with smaller size have higher catalytic activity.The highest turnover frequency?TOF?of the AOBC/AuNPs nanohybrids is 1190 h^-1.A fluid column contained AOBC/AuNPs nanohybrids has been filled and used for the continuously catalysis of the reduction of 4-NP by using NaBH₄.The column works well without detection of 4-NP in the eluent.More interestingly,the AOBC/AuNPs nanohybrids have an excellent catalytic stability.The fluid column has been running for more than two months without loss the catalytic ability,and it is still running.This work provides an excellent catalyst based on bacterial cellulose stabilized AuNPs and has promising applications in industry.