Petaloid-array hierarchically structured carbon Dots/Mg(OH)2 composite: Design, characterization and removal/recovery of cadmium via slowly releasing

Facile fabrication of ion-imprinted Fe3O4/carboxymethyl cellulose magnetic biosorbent: removal and recovery properties for trivalent La ions

“…Continue to increase the concertation of La( iii ), the adsorption capacity changes little. Both Freundlich and Langmuir isotherm adsorption models 10 were applied to fit the adsorption experimental data according to the eqn (3) and (4) . Where C e is the concentration of La( iii ) at the time of adsorption equilibrium (mg L −1 ); q e is the equilibrium adsorption capacity (mg g −1 ); q m,cal is the calculated maximum adsorption capacity (mg g −1 ); and K L / K F is the Langmuir (L mg −1 )/Freundlich adsorption equilibrium constant (mg g −1 ).…”

Efficient and Superstable Mineralization of Toxic Cd2+ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

“…Cadmium (Cd) is a heavy metal with high toxicity . Wastewater and agricultural soils polluted with Cd 2+ ions have become a global issue, owing to the fact that cadmium can accumulate in organisms throughout the food chain and a serious threat to ecosystems and human health. − Recently, a wide range of methods have been explored for cadmium removal from water and soils including adsorption, chemical precipitation, membrane filtration, ion exchange, electro-kinetic extraction, solidification, phytoremediation, and soil washing. − However, their large-scale application is limited due to their high cost, stability, and operational difficulties in practical settings. − Accordingly, adsorbent materials such as carbon-based materials, zeolites, and metal–organic frameworks remain the preferred materials for Cd 2+ capture and remediation. − However, the cadmium adsorption capacity and stability of current adsorbents are still not satisfactory, motivating the search for novel adsorbents that can selectively immobilize cadmium ions with very high adsorption capacities …”

Modification of Kaolin with Carbon Quantum Dots as Composite for Methylene Blue Removal: Literature Review and Experiment

“…CQDs is an attractive nanomaterial with good chemical and optical stability, high specific surface area, and excellent adsorption capability (Chung Hui et al, 2021;Liu et al, 2017b;Yahaya Pudza et al, 2020;. The adsorption performance of CQDs has been tested for the removal of heavy metals such as cadmium and lead also for the removal of cationic dyes in the form of composites (de Oliveira et al, 2020;Yahaya Pudza et al, 2020;Yang et al, 2019;Yin et al, 2020;Zainal Abidin et al, 2020).…”

“…The adsorption of pollutants can be greatly enhanced by incorporating CQDs into the matrix of kaolin, which could facilitate the addition of abundant surface functional groups. As a result, the adsorption performance is enhanced through van der Waals forces, hydrogen bonds, or even electrostatic attraction with pollutants (Yahaya Pudza et al, 2020;Yin et al, 2020). To the best of our knowledge, the combination of kaolin with CQDs for the removal of pollutants remains limitedly explored.…”