Synthesis of Plant-Mediated Iron Oxide Nanoparticles and Optimization of Chemically Modified Activated Carbon Adsorbents for Removal of As, Pb, and Cd Ions from Wastewater

作者：Ali Rehman, Abdul Naeem, Ijaz Ahmad, Fozia Fozia, Mikhlid H. Almutairi, Madeeha Aslam, Muhammad Israr, Bader O. Almutairi, Zia Ullah · 发表于：ACS Omega · 年份：2023 · DOI：10.1021/acsomega.3c05299 · 被引用次数：20 · 研究领域：Electrochemical Analysis and Applications、Nanoparticles: synthesis and applications、Nanotechnology research and applications

High Resolution Image Download MS PowerPoint Slide This research study was designed with the aim to prepare plant extract-mediated iron oxide nanoparticles (IONPs) and different chemically modified carbon adsorbents from the Parthenium hysterophorus plant and then optimize the carbon adsorbents by evaluating their adsorption applications in wastewater for the selected metal ions like arsenic (As 3+ ), lead (Pb 2+ ), and cadmium (Cd 2+ ). The Fourier transform infrared spectroscopy (FTIR) technique was used to highlight functional groups in plant-mediated IONPs and chemically modified carbon adsorbents. A scanning electron microscopy study was conducted to explain the surface morphology of the adsorbents. Energy-dispersive X-rays was used for elemental analysis and X-ray diffraction for particle size and crystallinity of the adsorbents. From the study, it was found that the best optimum conditions were pH = 5–6, initial concentration of adsorbate of 10 mg/L, dose of adsorbent of 0.01 g, contact time of 90–120 min of adsorbent and adsorbate, and temperature of 25 °C. At optimum conditions, the adsorption capacities of IONPs for arsenic (As) 144.7 mg/g, lead (Pb) 128.01 mg/g, and cadmium (Cd) ions 122.1 mg/g were recorded. The activated carbon at optimum conditions showed adsorption capacities of 46.35 mg/g for As, 121.95 mg/g for Pb, and 113.25 mg/g for Cd ion. At equilibrium, Langmuir, Freundlich Temkin, and Dubinin–Radushkevich isotherms were applied on the experimental adsor...