Comparison of the Adsorption Ability of MgAl-HC, CaAl-HC, and ZaAl-HC Composite Materials Based on Duku Peel Hydrochar in Adsorption of Direct Green Anionic Dyes

Novie Juleanti (Magister Program, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa No. 524, Ilir Barat 1, Palembang 30139, South Sumatra, Indonesia)
Normah Normah (Magister Program, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa No. 524, Ilir Barat 1, Palembang 30139, South Sumatra, Indonesia)
Patimah Mega Syah Bahar Nur Siregar (Magister Program, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa No. 524, Ilir Barat 1, Palembang 30139, South Sumatra, Indonesia)
Alfan Wijaya (Magister Program, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Padang Selasa No. 524, Ilir Barat 1, Palembang 30139, South Sumatra, Indonesia)
Neza Rahayu Palapa (Graduate School, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Palembang-Prabumulih Km. 90-32, Ogan Ilir 30862, South Sumatra, Indonesia)
Tamizi Taher (Department of Environmental Engineering, Faculty of Mathematics and Natural Sciences, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Hui, Jati Agung, Lampung 35365, Indonesia Research Center of Inorganic Materials and Complexes, Faculty of Mat)
Nurlisa Hidayati (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)
Risfidian Mohadi (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)
Aldes Lesbani (Graduate School, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jl. Palembang-Prabumulih Km. 90-32, Ogan Ilir 30862, South Sumatra, Indonesia Research Center of Inorganic Materials and Complexes, Faculty of Mathematics and Natural)

Indonesian Journal of Chemistry
Vol 22, No 1 (2022)

Preparation of composite material from layered double hydroxide (LDH) with hydrochar (HC) from duku peel produces CaAl-HC, MgAl-HC, and ZnAl-HC have shown the success of the preparation process as evidenced by characterizations such as XRD and FT-IR. The XRD characterization data evidenced the typical diffraction of the hydrochar around 2θ = 20° in the composite material. FTIR analysis is a characterization that supports the success of composite materials, which showed the presence of typical vibrations of HC at 3245, 2931, and 1635 cm–1 contained in the composite spectrum. The application of MgAl-HC, CaAl-HC, and ZnAl-HC composites as adsorbents showed Qmax (adsorption ability) values of 94.340 mg/g, 128.205 mg/g, and 89.286 mg/g. Overall the adsorption process is endothermic with a positive enthalpy value, and a negative Gibbs free energy value indicates a spontaneous adsorption process. The isotherm model of MgAl-HC, CaAl-HC, and ZnAl-HC show that the Langmuir isotherm model is more dominant, as indicated by the R2 value closer to 1 which indicates that the adsorption process takes place in a monolayer.