Abstract
Activated carbon (AC) is highly desirable as an adsorbent for NH3 due to its low cost. Metal chlorides, such as CuCl2, are also known as efficient components for NH3 adsorption. However, once loaded onto AC, CuCl2 tends to aggregate easily, thereby reducing its utilization efficiency. In this work, a facile approach involving HNO3 treatment followed by Cu loading was employed to prepare a high-performance AC adsorbent for NH3 adsorption at room temperature. The AC with a defect-rich surface and a well-developed pore structure was obtained by 30% HNO3 treatment. The subsequently loaded 5 wt% Cu exhibited a highly dispersed state. Consequently, compared to AC directly loaded with Cu without HNO3 treatment, the NH3 adsorption capacity was increased more than 5-fold. Meanwhile, the acidic functional groups introduced by HNO3 treatment also played a significant role in this enhancement. Furthermore, the structure-performance relationship of the prepared adsorbent and the mechanism of NH3 adsorption were elucidated according to characterization results. This work provides a facile strategy for enhancing metal dispersion on activated carbon and its adsorption performance.
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