ABSTRACT Arsenic contamination in water, particularly from highly toxic arsenite (As(III)), continues to pose a significant global public health challenge due to its high mobility and resistance to conventional treatment methods. This study presents an innovative core‐shell β‐FeOOH@MnO 2 nanocomposite, which synergistically integrates MnO 2 nanosheets to oxidize As(III) into adsorptive arsenate (As(V)) and β‐FeOOH to facilitate the efficient uptake of As(V). This approach addresses common limitations such as particle aggregation and suboptimal adsorption observed in pure MnO 2 systems. The nanocomposite, synthesized by hydrothermal methods, exhibits a doubled surface area of 172.95 m 2 /g, offering numerous active sites and mesopores conducive to rapid mass transfer. Under optimized conditions (pH 3.0, 0.4‐g/L dosage), the nanocomposite achieved 98.39% removal of As(III) and a maximum adsorption capacity of 50.26 mg/g at 25°C, following pseudo‐second‐order kinetics and endothermic chemisorption. Characterization techniques, including X‐ray diffraction (XRD), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS), confirmed the synergistic mechanism, wherein MnO 2 oxidizes As(III) through the reduction of Mn 4+ to Mn 3+ , and the resulting As(V) is adsorbed by β‐FeOOH. This advancement offers a cost‐effective and efficient solution for improved arsenic remediation in water treatment applications.
Li et al. (Thu,) studied this question.
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