Use of Loess as Adsorbent for Recovery of Li⁺ from Seawater

Abstract

In this study, a natural loess soil was evaluated as an adsorbent of Li+ in seawater. Only Li+ was adsorbed preferentially by loess over other cations in seawater despite having the lowest concentration. The adsorption studies of Li+ with loess were assessed using the batch equilibration method. In batch adsorption experiment, the various factors such as agitation time, initial concentration, and amount of dose were investigated. Adsorption isotherm and kinetic studies were performed to quantify the adsorption capacity and adsorption rate of Li+ by loess from seawater. The equilibrium data of adsorption were fitted by using the Freundlich and Langmuir isotherm models. It was seen that the Langmuir isotherm is better in describing the adsorption process of Li+ by loess due to its higher correlation coefficient R2 value. The maximum adsorption capacity of loess for Li+ obtained by Langmuir isotherm was 0.193 mg/g. The pseudo‐first‐order, the pseudo‐second‐order, and the intra‐particle diffusion kinetic models were employed to analyze the time‐dependent adsorption rate of Li+. It was found that the adsorption of Li+ closely follows the pseudo‐second‐order kinetic model, from which a very accurate estimation of the equilibrium adsorption capacity (qe,cal) was achieved, as well as the higher R2. Because of its low‐cost and high selectivity towards Li+, loess could be probably an applicable adsorbent for the recovery of Li+ from seawater.

Mesoporous Aluminosilicate Nanofibers with a Low Si/Al Ratio as Acidic Catalyst for Hydrodeoxygenation of Phenol

“…Moreover, the high content of water (above 50 wt.%) in raw bio‐oil and its formation during HDO process are two additional factors to take into account . It is well known that pure mesoporous silica such as MCM‐41 and MCM‐48 are weakly resistant to harsh hydrothermal conditions . To increase their hydrothermal stability, surface modifications with hydrophobic moieties or aluminum species are often undertaken .…”

Review: Progress with Functional Materials Based on Loess Particles

“…Loess could be used as an adsorbent for the recovery of Li + according to Kim et al (2017) Loess exhibited greater selectivity for Li + than for other cations (Ca 2+ , Mg 2+ , K + , and Na + ) in seawater, and it is inexpensive.…”

Synthesis of mesoporous carbons using silica templates impregnated with mineral acids

“…Surface modification and functionalization of CMK carbons have also been extensively studied to improve their performance [15][16][17][18].…”

“…Various organic compounds, such as sucrose [1,2,5], furfuryl alcohol (FA) [3], acenaphthene [19], phenol resin [20], and acrylonitrile [15], can be used as the carbon source. FA is one of the most convenient sources of carbon as the liquid-phase compound that can be easily impregnated into silica mesopores.…”