Liao Xu, Miranda Avilés Raúl, Serafin Muñoz Alma Hortensia, Rocha Amador Diana Olivia, Perez Rodriguez Rebeca Yasmin, Hernández Anguiano Jesús Horacio, Julia Navarro Carmen, Zha Xiaoxiao, Moncada Daniela, de Jesús Puy Alquiza María, Vinod Kshirsagar Pooja, Li Yanmei
Doctoral Program of Water Science and Technology, Engineering Division, University of Guanajuato, 36000, Guanajuato, Guanajuato, Mexico.
Department of Mining, Metallurgy and Geology Engineering, University of Guanajuato, 36020, Guanajuato, Guanajuato, Mexico.
Sci Rep. 2024 Sep 5;14(1):20769. doi: 10.1038/s41598-024-69769-7.
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, HCO 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 m 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 CO-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).
本研究旨在探讨从水溶液中低能耗高效去除砷的方法。通过将铁浸渍在烘焙剑麻纤维上合成了设计的吸附剂Fe/TBC。等温吸附实验表明，在25.0℃和40.0℃下，砷（V）的最大吸附容量分别为7.30mg/g和8.98mg/g。干扰测试表明，溶液中pH值、HCO浓度和腐殖酸含量的升高会抑制Fe/TBC对砷的吸附。使用FTIR和SEM-EDS技术对吸附前后的吸附剂进行表征，证实了砷的吸附机制，包括孔隙填充、静电相互作用、表面络合和氢键粘附。进行了柱实验以处理加砷水和天然地下水，有效处理体积分别为550mL和8792mL。最后，以处理1m天然地下水为功能单元，使用OpenLCA 2.0.3软件进行生命周期评估（LCA）。结果表明，在Fe/TBC合成阶段对环境的影响相对较大。整个生命周期过程产生的全球变暖潜势被确定为0.8kg CO2-eq。批次和柱实验、再生研究以及LCA分析的结果表明，Fe/TBC可能是一种有前景的砷（V）吸附剂。
