Phuong Lan Tran-Nguyen, Kim-Phung Ly, Quoc-Khanh Huynh, Minh-Nhut Nguyen, Shella Permatasari Santoso, Hong-Nam Nguyen, Nguyen-Phuong-Dung Tran, Artik Elisa Angkawijaya, Maria Yuliana, Thi Thanh Khuong Tran
Among the removal techniques for organic contaminants in water, adsorption is a highly selected method due to many advantages in cost, simple process, and good efficiency. A green and straightforward synthesis for generating an iron oxide-grafted thiamin based adsorbents is developed. Their physicochemical and adsorption properties varied depending on the mixing ratio of ferrous chloride salt and thiamin. Adsorbents exhibited different magnetic properties owing to the presence of Fe3O4, α-Fe2O3, and γ-Fe2O3 crystalline phases. Their surface charges of iron oxide and functionalized thiamin-adsorbents were 25 mV and 30–52.3 mV, respectively while the C and N contents of thiamin ranged from 3.87–14.5% and 3.95–8.15% at different mixing ratios. Besides, scanning electron microscope (SEM) and thermogravimetric analysis (TGA) were used to analyze the morphology and thermal stability of adsorbents, respectively. This work investigated the effect of thiamin content in the material composition-based iron oxide on the adsorption capacity of anionic dyes. At the optimal condition (pH 5, an adsorbent dosage of 2 g/L, and a 30 mg/L concentration), the MO adsorption efficiency reached 77.56% in 30 min. Meanwhile, a 93.83% EBT was removed at pH 7, an adsorbent dosage of 2 g/L, and a 90 mg/L concentration at the same time. The adsorption mechanism follows the Langmuir isotherm model and the pseudo second-order (PSO) kinetic model. The adsorption processes are spontaneous and exothermic. The characteristic vibrations of functional groups of adsorbents were identified via Fourier transform infrared spectroscopy (FTIR). After four cycles, adsorbents could be employed albeit with a lower efficiency. © 2024 Taylor & Francis Group, LLC.
Faculty of Mechanical Engineering, Can Tho University, Can Tho, Viet Nam; Stem cell Laboratory, Department of Molecular Biology, Institute of Biotechnology and Food, Tho University, Can Tho, Viet Nam; Faculty of Chemical Engineering, Can Tho University, Can Tho, Viet Nam; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Surabaya, Indonesia; University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, Hanoi, Viet Nam; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan; Center for Sustainable Resource Science, RIKEN, Yokohama, Japan