Synthesis of carbon dots-assisted MgAl-LDH hollow microspheres with hierarchical structure for the effective removal of Congo red from wastewater

Hierarchical hollow Mg-Al layered double hydroxide microspheres (HHMs) are successfully prepared by hydrothermal treatment in the presence of carbon dots (CDs). Morphology and structure as-prepared samples characterized using XRD, SEM, FT-IR, TEM techniques. The growth process HHMs has been investigated detail, Ostwald ripening mechanism is suggested for hierarchical HHMs. Adsorption isotherms adsorption kinetics congo red (CR) investigated. Langmuir Temkin model more fitted to experimental data CR isotherm adsorption. kinetic obeys pseudo-second-order model. Moreover, thermodynamic parameters (ΔG o , ΔH ΔS ) show that onto an endothermic spontaneous process. could be a potential adsorbent wastewater containing anion dyes.