Adsorption of hexamethyl pararosaniline chloride dye on MgO‐PbFe₂O₄: Experimental study and statistical physics modeling via double‐layer model

Abstract

MgO doped PbFe2O4 (MgO‐PbFe2O4) is synthesized by co‐precipitation followed by ultrasonication method. The study was carried out for the effective adsorption of hexamethyl pararosaniline chloride dye (HPCD) on MgO‐PbFe2O4 from the industrial effluent. The experimental and theoretical physical models are used to explain the mechanism of the dye adsorption process. The simulation of dye adsorption assuming interaction HPCD + MgO‐PbFe2O4 is proposed from two types (a) adsorption of dye on MgO‐PbFe2O4 surface, and (b) the trapping of the HPCD dye in the pores and cavities present in the MgO‐PbFe2O4 surface. A theoretical measurement displays the parameter n pattern as a solution temperature function was n = 0.373, 0.371, and 0.321 at 298, 308, and 318 K, respectively (i.e., all values were below 1). Thus, during interactions between HPCD and MgO‐PbFe2O4 active sites, horizontal molecular positioning and multi‐locking mechanisms were involved. The kinetic model shows that the HPCD adsorptions on MgO‐PbFe2O4 follow the reaction's pseudo‐first‐order. Langmuir isotherm modeling best fitted and describes the HPCD‐MgO‐PbFe2O4 adsorption system for HPCD dye in 40 min with Qmax at 333.33 (mg L–1). The reused study and application in the removal of dye from the industrial effluent make MgO‐PbFe2O4 effective material for pollution control.