Magnetite humic acid-decorated MgAl layered double hydroxide and its application in procion red adsorption

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2024-03, Vol.684, p.133042, Article 133042
• Main Authors: Ahmad, Nur, Rohmatullaili, Wijaya, Alfan, Lesbani, Aldes
• Format: Article
• Language: English
• Subjects: Adsorption; Humic acid; Layered double hydroxide; Magnetite; Procion red
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.133042

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. [Display omitted] •Preparation of MgAl-Magnetite Humic Acid (MHA) was successful.•MgAl-MHA improved the adsorption of procion red.•MgAl-MHA has easily separated the adsorbent and adsorbate using an external magnet.•The highest maximum adsorption capacity is MgAl-MHA (192.037 mg/g).•MgA-MHA regeneration efficiency from 100% to 57.89% in the fifth cycle.