Chromium Cross-Linking Based Immobilization of Silver Nanoparticle Coating on Leather Surface with Broad-Spectrum Antimicrobial Activity and Durability

Abstract

Leather with durable and broad-spectrum antimicrobial properties is very attractive in applications to produce diabetic shoes. In this work, gallic acid stabilized silver nanoparticles (GA@AgNPs) were prepared as waterborne finishing agent to be spray-coated on leather surface, with subsequent immobilization onto skin collagen via chromium(III) cross-linking. Such chemical anchoring of AgNPs onto microscaled collagen fibers not only enhanced the hydrophobicity of leather surface but also converted the surface ζ-potential from a positive charge to a negative charge, resulting in the excellent microbial antiadhesive ability of GA@AgNP-coated leather because of its dual-hydrophobic and electrostatic repelling of microbial adhesion. Such GA@AgNP coating also exhibited broad-spectrum antimicrobial activity against Escherichia coli, Staphylococcus aureus, methicillin-resistant S. aureus, and Candida albicans, with killing efficiencies all higher than 99%. Moreover, the killed microbes could be easily released from this anionic GA@AgNP spray coating by simply washing, preserving, and giving long-term antimicrobial activity to leather products. Most of all, the robust immobilization of AgNPs guaranteed the durably antimicrobial activity of such GA@AgNP-coated leather against laundry, perspiration, and mechanical abrasion in real daily use.

Gallic acid-functionalized graphene hydrogel as adsorbent for removal of chromium (iii) and organic dye pollutants from tannery wastewater

“…S1 †). 46,47 As shown in Scheme 1, GA-GH was prepared by the one-step reduction-induced assembly of GO with the aid of GA, conducted at 100 C for 8 hours at pH 9.0. However, as shown in Fig.…”

Facile fabrication of functional cellulose paper with high-capacity immobilization of Ag nanoparticles for catalytic applications for tannery wastewater

“…Gallic acid-modified silver nanoparticles (GA@AgNPs) with concentration of 100 mg/L were prepared according to our previous work [42]. Briefly, aqueous AgNO 3 solution (17 mM) was mixed with an equal volume of GA solution (18 mM).…”

“…In recent years, biomass materials have been used as Ag nanoparticle carriers due to their low cost and easy availability, compared to other matrix carriers such as graphene and carbon nanotubes [42,43]. In addition, biomass materials also have many advantageous properties, such as excellent thermal stability and chemical durability, high specific surface area, and rich pores and functional groups [44].…”

“…In this work, a convenient lipoic acid modification method was developed to immobilize AgNPs on cellulose paper to catalyze harmful 4-NP into a more environmentally friendly 4-AP. In previous work [42], a negatively charged gallic acidmodified silver nanoparticles (GA@AgNPs) was synthesized with a large number of carboxyl groups on the surface and an average particle size of 8 nm and was used as a nanocatalyst. Lipoic acid modification on the surface of cellulose fibers could drive uniform immobilization of GA@AgNPs.…”

Bahaya Kromium Hexavalen (Cr VI) Pada Kulit Dan Produk Kulit Samak Krom Serta Upaya Pencegahannya

“…Garam kromium trivalen (Cr 3+ ) merupakan zat penyamak krom yang paling banyak digunakan dalam industri kulit (Jia, et al, 2019). Ion Cr 3+ bereaksi dengan gugus karboksil pada kolagen kulit untuk membentuk ikatan koordinasi yang kuat, yaitu ikatan silang dengan serat kolagen sehingga merubah kulit mentah menjadi kulit yang stabil (Xia, et al, 2019). Secara rinci Covington, (2009) menyatakan bahwa waktu proses penyamakan krom lebih singkat apabila dibandingkan dengan penyamakan nabati.…”