Abstract
The high catalytic activity of membrane-binding gold nanoparticles (AuNPs) makes its application in oxidation or reduction an attractive challenge. Herein, surface-functionalized bacterial cellulose (BC-poly(HEMA)) was successfully prepared with 2-hydroxyethyl methacrylate (HEMA) as monomers via the atom transfer radical polymerization (ATRP) method. BC-poly(HEMA) was further utilized as not only reducing agent but also carrier for uniform distribution of the AuNPs in the diameter of about 8 nm on the membrane surface during the synthesis stage. The synthesized AuNPs/BC-poly(HEMA) exhibited excellent catalytic activity and reusability for reducing 4-nitrophenol (4-NP) from NaBH4. The results proved that the catalytic performance of AuNPs/BC-poly(HEMA) was affected by the surrounding temperature and pH, and AuNPs/BC-poly(HEMA) maintained the extremely high catalytic activity of AuNPs/BC-poly(HEMA) even after 10 reuses. In addition, no 4-NP was detected in the degradation solution after being stored for 45 days. The reusable catalyst prepared by this work shows a potential industrial application prospect.
Highlights
Gold nanoparticles (AuNPs) are one of the most promising NPs compared with various metal and metal oxide NPs [1], owing to their excellent catalytic performance in a variety of chemical reactions including reductive catalysis of chlorinated [2], organic synthesis [3] and low-temperature CO oxidation [4]
bacterial cellulose (BC) was firstly modified by atom transfer radical polymerization (ATRP), and BC-poly(HEMA) was used as reducing agent and stabilizer, and the catalytic activity and reusability of AuNPs/BC-poly(HEMA) were investigated
The monomer of hydroxyethyl methacrylate (HEMA) was successfully grafted on the surface of BC membrane via the ATRP method and the BC-poly(HEMA) obtained acted as the reducing agent and the carrier for preparing AuNPs
Summary
Gold nanoparticles (AuNPs) are one of the most promising NPs compared with various metal and metal oxide NPs [1], owing to their excellent catalytic performance in a variety of chemical reactions including reductive catalysis of chlorinated [2], organic synthesis [3] and low-temperature CO oxidation [4]. Polymers can be used as the carriers for AuNPs due to its abundant active sites, obtaining reusable and stable AuNPs [13]. As the most abundant polymer on Earth [17], has been proved to be a green reducing agent for AuNPs synthesis [18]. Li et al reported the preparation of metal nanoparticles with functional cellulose as reducing agent [20]. BC was firstly modified by ATRP, and BC-poly(HEMA) was used as reducing agent and stabilizer, and the catalytic activity and reusability of AuNPs/BC-poly(HEMA) were investigated. The results indicated that the AuNPs/BC-poly(HEMA) was an efficient reusable catalyst
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