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Abstract
The present study aims to investigate the low-energy consumption and high-efficiency removal of arsenic from aqueous solutions. The designed adsorbent Fe/TBC was synthesized by impregnating iron on torrefaction henequen fibers. Isothermal adsorption experiments indicated maximum adsorption capacities of 7.30 mg/g and 8.98 mg/g for arsenic(V) at 25.0 °C and 40.0 °C, respectively. The interference testing showed that elevated levels of pH, HCO3− concentration, and humic acid content in the solution could inhibit the adsorption of arsenic by Fe/TBC. Characterization of the adsorbent before and after adsorption using FTIR and SEM–EDS techniques confirmed arsenic adsorption mechanisms, including pore filling, electrostatic interaction, surface complexation, and H-bond adhesion. Column experiments were conducted to treat arsenic-spiked water and natural groundwater, with effective treatment volumes of 550 mL and 8792 mL, respectively. Lastly, the life cycle assessment (LCA) using OpenLCA 2.0.3 software was performed to treat 1 m3 of natural groundwater as the functional unit. The results indicated relatively significant environmental impacts during the Fe/TBC synthesis stage. The global warming potential resulting from the entire life cycle process was determined to be 0.8 kg CO2-eq. The results from batch and column experiments, regeneration studies, and LCA analysis indicate that Fe/TBC could be a promising adsorbent for arsenic(V).
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Details
1 University of Guanajuato, Doctoral Program of Water Science and Technology, Engineering Division, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
2 University of Guanajuato, Department of Mining, Metallurgy and Geology Engineering, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457); University of Guanajuato, Laboratory for Research and Characterization of Minerals and Materials, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
3 University of Guanajuato, Department of Civil Engineering, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
4 University of Guanajuato, Pharmacy Department, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
5 University of Guanajuato, Chemistry Department, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
6 University of Guanajuato, Department of Geomatics and Hydraulic Engineering, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
7 University Autonomous of Chihuahua, Faculty of Engineering, Chihuahua, Mexico (GRID:grid.440441.1) (ISNI:0000 0001 0695 3281)
8 University of Guanajuato, Laboratory for Research and Characterization of Minerals and Materials, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)
9 University of Guanajuato, Department of Mining, Metallurgy and Geology Engineering, Guanajuato, Mexico (GRID:grid.412891.7) (ISNI:0000 0001 0561 8457)