In Situ Synthesis of Gold Nanoparticles on Wool Powder and Their Catalytic Application

Abstract

Gold nanoparticles (AuNPs) were synthesized in situ on wool powder (WP) under heating conditions. Wool powder not only reduced Au ions to AuNPs, but also provided a support for as-synthesized AuNPs. WPs were treated under different concentrations of Au ions, and corresponding optical features and morphologies of the treated WPs were investigated by UV-VIS diffuse reflectance absorption spectroscopy and scanning electron microscopy (SEM). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscope (TEM) were also employed to characterize the WP treated with AuNPs. The results demonstrate that AuNPs were produced in the presence of WP and distributed over the wool particles. The porous structure led to the synthesis of AuNPs in the internal parts of WP. Acid conditions and high temperature facilitated the synthesis of AuNPs by WP in aqueous solution. The reducibility of wool was improved after being converted to powder from fibers, due to exposure of more active groups. Moreover, the obtained AuNP-WP complexes showed significant catalytic activity to accelerate the reduction reaction of 4-nitrophenol (4-NP) by sodium borohydride (NaBH4).

Functionalization of Silk with In-Situ Synthesized Platinum Nanoparticles

“…Generally, the reduction of 4-NP into 4-AP is considered as a pseudo-first-order kinetic reaction in the presence of adequate NaBH 4 [ 35 , 36 ]. This pseudo-first-order hypothesis for reduction of 4-NP was demonstrated by the linear correlation between ln(A t /A 0 ) and time ( Figure 9 a).…”

Adsorption Properties of Au(III) and Cu(II) from Aqueous Solution Using Chemically Treated Sheep Wool

“…Therefore, the adsorption of Au(III) by the chemically treated sheep wools can be determined chemisorption due to the formation of a chemical bond between the Au(III) and sheep wool (Tang et al, 2017). Figure 8.…”

“…Chicken feather powder was prepared and used to remove Ag, Pd, and Pt (Suyama et al, 1996). Wool powder was applied to adsorption of gold nanoparticles (Tang et al, 2017). AuCN removal was carried out using chicken feather (Ishikawa and Suyama, 1998).…”

Utilization of Proteinic Biopolymers: Current Status and Future Prospects

“…The conversion of keratin-based wastes into valuable materials was studied extensively by many workers [59][60][61]. It has been reported that keratinous waste was ground into powders for further processing, settled into films and lightweight composites [62], and finally chemically modified into thermoplastics and adsorbents [63,64].…”