Yunan Amza Muhammad, Sunaryono Sunaryono, Siti Zulaikah
Alginate as a natural adsorbent can play a vital role in the removal of heavy metal elements such as lead from wastewater. Chemical industries have been encountering difficulties in removing heavy metals such as lead using conventional methods. This work demonstrated the potential to treat effluents utilizing alginate encapsulated magnetite gel as a natural sorbent. The magnetite (Fe3O4) had been successfully prepared by the coprecipitation method. Meanwhile, the alginate gel coating on magnetite was performed by an encapsulated method. Magnetite sorbent based on encapsulated alginate obtained were characterized by using XRD, FTIR, VSM and AAS to determine the particle structure, material functional groups, magnetic properties of the sample and adsorption of lead (II), respectively. The results of characterization using XRD showed that Fe3O4 nanoparticle has a cubic structure with the particle size was around 10-15 nm. FTIR results show the sample has a functional group of the main components of Fe-O at wave number 420-507 cm-1 and the band at 3458, 1591, 1425, 1014 cm-1 explain the presence of OH strain vibrations, symmetrical strains of the CH2 group, asymmetrical COO strain vibrations and symmetrical COO strain vibrations which are the characteristic of alginate gel matrix. VSM results show the decrease of magnetic saturation along with increasing alginate concentration. This decrease shows that the aggregation of magnetic particles is getting smaller caused by alginate gel matrix. Furthermore, the sample parameter studied also includes properties of sorbent, contact time, and initial concentration. The results of lead (II) absorption experiment showed that longer contact time and the higher the concentration of alginate increased the concentration of lead (II) uptake. The adsorbent derived from this material is expected to be a low-cost product for heavy metal ion removal from wastewater. © 2023 American Institute of Physics Inc.. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang, 65145, Indonesia; Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang No. 5, Malang, 65145, Indonesia