Abstract
The porous nanomaterials with hollow structure offers widespread potential applications due to its low density, strong dispersibility, rich porosity, high surface area, and good permeability. In this study, a hollow nanoshell of layered double oxides (LDOs) was synthesized using carbon nanospheres as a sacrificial template core and layer double hydroxides (LDHs) as shell-building precursors. The morphology, crystal phase, water dispersibility, and surface properties of the as-prepared samples were characterized by XRD, FTIR, SEM, TEM, XPS, BET, DLS, and zeta potential analyzer. The adsorption experiment indicated that the optimum pH for 2,4-DCP adsorption was achieved at pH 7.0. The adsorption data were best fitted to Langmuir isotherm model and thermodynamic results suggested that the adsorption process was both spontaneous and exothermic. The hollow nanoshell of LDOs exhibited superior adsorption capacity for 2,4-dichlorophenol (2,4-DCP) uptake. It was also found that the maximum adsorption capacity of 2,4-DCP onto the hollow nanoshell of LDOs was 566.08 mg/g at 293 K. In addition, regeneration study implied that the hollow nanoshell of LDO exhibited good cyclic adsorption performance. This work provided a promising mesoporous adsorbent that possesses a great potential for 2,4-DCP pollutant treatment.
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