A new synthesis method of ultrathin Zn-Al layered double hydroxide with super adsorption capacity

Abstract

Layered double hydroxide (LDH) is a kind of stratiform compound with a large specific surface area and strong adsorption capacity, which is widely used in printing and dyeing wastewater treatment. Herein, we synthesized ultrathin Zn-Al LDH (U-Zn-Al LDH) by temperature-assisted intercalation exfoliation strategy using sodium dodecyl benzene sulfonate (SDBS) at 80 ° C. The thickness of the obtained U-Zn-Al LDH was about 4.5 nm and it featured higher specific surface area (49.5 m2/g) as compared to the pristine sample (26.6 m2/g). As a result, U-Zn-Al LDH exhibited higher adsorption activity of methyl orange (MO) dye. Furthermore, the possibly existed defects during the ultrathining process changed the adsorption mode of MO, resulting in a vertical and ordered configuration of MO on U-Zn-Al LDH, which was another reason for its higher adsorption capacity.

Layered Double Hydroxides in Bioinspired Nanotechnology

“…The intrinsically high surface to volume ratio of LDHs, possibly enhanced by recently proposed ultrathin LDH synthesis routes [166][167][168], has been leveraged for many applications that require physical processes of absorption and interaction with molecules for bioremediation of contaminated sites, such heavy metals, toxic substances, pesticides or even favoring their photo-induced degradation [169]. An approach for further improving the efficiency of LDH-empowered devices for bioremediation is the realization of 3D biomimetic structures or the coupling with organic biotemplates (typically of plant origin) aiming at the realization of life-mimicking 3D high-surface hierarchical organization, miniaturization, eco-friendly characteristics and even specificity for the absorption of targeted molecular systems.…”