Superior adsorption and removal of toxic industrial dyes using cubic Pm3n aluminosilica form an aqueous solution, Isotherm, Kinetic, thermodynamic and mechanism of interaction

Abstract

In the current work, a direct synthesis method was used to create an ordered mesocage cubic Pm3n aluminosilica nanoadsorbent with mesopores and a monolith-like shape. Rhodamine B (RB), a harmful dye for the environment, was successfully removed from wastewater using this aluminosilica nanoadsorbent. The aluminosilica nanoadsorbent's multi-directional pores (3D), mesostructural geometries, and loading amount of Bronsted acid sites were important in improving the coverage of the nanoadsorbent surfaces and intra-particle diffusion of adsorbate (RB) molecules onto the network surfaces and into the pore architectures of monoliths. The cubic Pm3n aluminosilica composite was characterized via XRD, EDX, XPS, FT-IR, HRSEM, BET, HRTEM, and pHzpc which was 4.05. The effect of pH on the adsorption process has been studied. In addition, the initial concentration approves that the reaction fitted to Langmuir. While, during the study, the effect of time the adsorption kinetic model was fitted to the pseudo-second order. On the other hand, the effect of temperature was proof that the reaction was spontaneous and endothermic. The RB was adsorbed at cubic Pm3n aluminosilica composite with high amount 1.75 mmLg−1. However, the reusability showed that the efficiency of the removal of RB using this adsorbent was more than 91 % after 6th cycle. The capability to design reversal RB adsorption systems with several reuse cycles is a key characteristic of the cubic Pm3n aluminosilica composite.