Vienna Saraswaty, Evyka S. Aji, Ardi Ardiansyah, Ayu Hanifah, Nathania Puspitasari, Shella P. Santoso, Sandy B. Hartono, Chandra Risdian, Elsy R. Chaldun, Henry Setiyanto
The current study introduces a one-pot technique for synthesizing an environmentally benign and cheap composite adsorbent, namely ZnO-PPAC, for the adsorption of Pb(II). The designated adsorbent was prepared by incorporating green synthesized zinc oxide (ZnO) nanoparticles on activated carbon-derived from pineapple peel. The prepared adsorbents were characterized using XRD, SEM, EDS, FTIR, and BET techniques. The XRD pattern verifies that the ZnO was successfully synthesized and immobilized onto the PPAC in a one pot synthesis system. The surface areas of ZnOPPAC and PPAC adsorbents were 13.62 m2/g and 961.96 m2/g, respectively. The FTIR evaluation of the ZnO-PPAC adsorbent revealed several characteristic absorption peaks corresponding to eOH groups, CeO groups, C]C groups, CeN groups, and M¡O groups. It was revealed that the adsorption of Pb(II) on the ZnO/PPAC adsorbent would not require any pH adjustment. The adsorption kinetics demonstrated that the adsorption of Pb(II) ions on PPAC and ZnOPPAC better fitted pseudo-second-order kinetics (R2 ¼ 0.999, both for PPAC and ZnO/PPAC) and followed the Freundlich model (R2 ¼ 0.989 and 0.987 for PPAC and ZnO/PPAC adsorbent). According to the Freundlich model, it is suggested that the adsorption of Pb(II) ions onto the designated adsorbents involves a multilayer process. The maximum adsorption capacities of ZnO/PPAC and PPAC were calculated as 769 mg/g and 667 mg/g, respectively. Thermodynamic analysis indicated an exothermic and spontaneous nature, as suggested by the negative values of DHºand DGº. In summary, both the prepared adsorbents greatly exhibited a high adsorption capacity of Pb(II) ions that can be used for environmental remediation. © 2024 University of Kerbala.
Research Centre for Applied Microbiology, National Research and Innovation Agency Republic of Indonesia, KST Samaun Samadikun, Bandung, 40135, Indonesia; Collaborative Research Center for Zero Waste and Sustainability, Jl. Kalijudan 37, Surabaya, 60114, Indonesia; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya, 60114, Indonesia; Research Center for Environmental and Clean Technology, National Research and Innovation Agency, Kawasan Puspiptek Gedung 820, Tangerang Selatan, 15314, Indonesia; Analytical Chemistry Research Group, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia