Abstract
The magnetite humic acid-decorated MgAl layered double hydroxide (MgAl-MHA) was prepared for this investigation. After five adsorption-desorption cycles, MgAl-MHA showed remarkable reusability and an adsorption rate of about 57% without suffering appreciable loss. The MgAl-MHA's magnetic properties further improve the process of adsorption and less the possibility of the surface being harmed. The influence of temperature, initial concentration of procion red, contact time, pH value, and pHpzc on procion red removal percentage of the MgAl-MHA was investigated in detail. The pseudo-second-order kinetic model and the Langmuir isotherm model were well-fitted by the adsorption kinetics and equilibrium adsorption isotherm, respectively. The thermodynamics analysis indicated that procion red adsorption onto the MgAl-MHA was endothermic and spontaneous. Procion red has a maximum adsorption capacity of 192.037 mg/g at 303 K. In light of the findings mentioned above, MgAl-MHA presents a viable adsorbent option with high recyclability and cheap cost for the removal of procion red.
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