Adsorption of Fe(II) by Layered Double Hydroxide Composite with Carbon-Based Material (Biochar and Graphite): Reusability and Thermodynamic Properties

Neza Rahayu Palapa (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Palembang-Prabumulih, Km. 90-32, Ogan Ilir 30862, South Sumatra, Indonesia)
Alfan Wijaya (Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa Bukit Besar, Palembang 30139, South Sumatera, Indonesia)
Patimah Mega Syah Bahar Nur Siregar (Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa Bukit Besar, Palembang 30139, South Sumatera, Indonesia)
Amri Amri (Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa Bukit Besar, Palembang 30139, South Sumatera, Indonesia)
Nur Ahmad (Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa Bukit Besar, Palembang 30139, South Sumatera, Indonesia)
Tarmizi Taher (Department of Environmental Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Hui, Lampung Selatan 35365, Indonesia)
Aldes Lesbani (Graduate School, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Palembang-Prabumulih, Km. 90-32, Ogan Ilir 30862, South Sumatra, Indonesia)

Indonesian Journal of Chemistry
Vol 23, No 1 (2023)

Layered double hydroxide (LDH) of Ni/Al was synthesized by coprecipitation method at pH 10 followed by the formation of composite with carbon-based material i.e., biochar (B) and graphite (G) to form Ni/Al-B and Ni/Al-G. Materials were characterized by XRD powder, FTIR, BET surface area, thermal analyses, and SEM analysis. The regeneration process and adsorption evaluated the performance of materials toward iron(II) [Fe(II)] from an aqueous solution. The results showed that the surface area of Ni/Al-B (428.94 m2/g) was increased mainly up to twenty-nine-fold than Ni/Al LDH (15.11 m2/g), while Ni/Al-G (21.59 m2/g) had slightly increased than pristine LDH. Composite of Ni/Al-B had reusability properties for Fe(II) adsorption up to five cycles and showed higher structural stability. The adsorption capacity of Ni/Al-B was 104.167 mg/g and can be a potential adsorbent to remove Fe(II) from an aqueous solution.