Layered Nanomaterials for Environmental Remediation Applications

Abstract

Layered nanomaterials such as layered double hydroxides, aluminosilicate clays and layered titanates possess unique physico-chemical properties originated from their characteristic 2-dimensional properties. They can not only accommodate various chemical substances utilizing their surface and interlayer spaces but also modify their structure through intercalation of functional molecules. In this review, we are going to demonstrate the strategies and research results on how layered nanomaterials are utilized in the environmental application such as remediation of water, air and soil purification through adsorption and catalytic decomposition routes.

Systematic utilization of layered double hydroxide nanosheets for effective removal of methyl orange from an aqueous system by π-π stacking-induced nanoconfinement

“…Carbonate anion is extremely stable between the LDH layers. Thus, it is easy to prepare carbonated LDHs but their interlayer space cannot be fully exploited as adsorbent site due to the low ion-exchange susceptibility (Choy et al, 2007;Kim et al, 2014;Oh et al, 2009), which is a reason of the smaller empirical surface area than the theoretical one. On the other hand, exchanged LDHs, such as nitrated one, can effectively adsorb anions through ion-exchange, but the production of the nitrated LDHs requires much energy and the release nitrate after anion removal can induce secondary pollution by eutrophication.…”