Tannic Acid Induced Self-Assembly of Three-Dimensional Graphene with Good Adsorption and Antibacterial Properties

Abstract

In this paper, a green one-step strategy is developed to fabricate three-dimensional (3D) graphene-based multifunctional material with the aid of tannic acid. Tannic acid (TA), a typical plant polyphenol widely present in woods, reduced GO and induced the self-assembly of reduced graphene oxide into graphene hydrogel. The preparation process was carried out in aqueous media under atmosphere pressure without using any toxic reducing agent or special instrument, which is a facile, green, and low-cost method. The as-prepared monolithic 3D graphene exhibits high porosity, low density, hydrophobicity, good mechanical performance, and thermal stability. In addition, it shows excellent adsorption toward dyes, oils, and organic solvent, which should be a promising candidate for efficient adsorbents in water purification. Moreover, the tannic acid retained in the skeleton of 3D graphene functions as a biofunctional component, which endows the TA-GH with good antibacterial capability.

1, 2‐Epoxy Propane Induced Self‐Assembly of Macroscopic Graphene with Good Adsorption

“…As illustrated in Figure S3 (Supporting Information), a broad characteristic peak at around 24.9° was appeared in XRD pattern of PO‐GA, corresponding to the interlayer distance ( d ‐spacing) of 0.35 nm. However, GO shows an intense peak at 10.6°, indicating an interlayer distance of 0.83 nm . For PO‐GA, this peak completely disappeared, suggesting the removal of most of the oxygen‐containing groups of GO.…”

“…It could be produced only when the temperature was over 95°C. This may be due to the insufficient reduction of graphene at low temperatures, and the hydrophobicity of the partially reduced GO is not strong enough to induce the self‐assembly into 3D architechture . Figure S2d (Supporting Information) shows that as the reaction time increases to 7 h, a black monolithic graphene hydrogel begin to form.…”

“…Antibiotics have also been considered as emerging pollutants because of their continuous input and persistence in the aquatic ecosystem even at very low concentrations . Rapid and convenient removal of these pollutants from wastewater has been a challenging issue faced by scientists …”

Phytotoxicological Tests - Applications of Foils Based on Graphene (Graphene Oxide)

“…(Luo et al, 2016;Bo et al, 2014) A large number of plant chemicals (Agharkar et al, 2014;Thakur et al, 2012) (e.g. ascorbic acid, gallic acid, caffeic acid, vitamin E, luteolin, apigenin, tannins, fl avonoids and others) have a polyphenolic structure that allows transition to the stable quinones associated with the reduction of the oxygen functional groups of GO.…”

Carbon aerogel evolution: Allotrope, graphene-inspired, and 3D-printed aerogels

“…Other "green" reductants that have been reported include tannic acid, dopamine, and amino acids. [89][90][91] In another study, 92 GAs with densities less than 3 mg/cm 3 were assembled in a one-pot synthesis step at the oil-water interface of a GO emulsion (Fig. S8).…”