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One-pot synthesis of layered double hydroxide hollow nanospheres with ultrafast removal efficiency for heavy metal ions and organic contaminants

Mubarak, Mahfuza, Jeon, Hyokyung, Islam, Md. Shahinul, Yoon, Cheolho, Bae, Jong-Seong, Hwang, Seong-Ju, Choi, Won San, Lee, Ha-Jin
Chemosphere 2018 v.201 pp. 676-686
World Health Organization, adsorption, aminophenols, arsenic, chromium, cost effectiveness, gold, heat treatment, heavy metals, iron, magnesium, maximum contaminant level, metal ions, nanogold, nanospheres, p-nitrophenol, synthesis, vanadium, wastewater
Herein, Mg/Fe layered double hydroxide (MF-LDH) hollow nanospheres were successfully prepared by a one-step thermal method. After the thermal treatment of MF-LDH nanospheres at 400 °C, the MF-LDH was converted into the corresponding oxide, Mg/Fe layered double oxide (MF-LDO), which maintained the hollow nanosphere structure. The MF-LDO hollow nanospheres exhibited excellent adsorption efficiency for both As(V) and Cr(VI), showing 99% removal within 5 min and providing maximum removal capacities of 178.6 mg g−1 [As(VI)] and 148.7 mg g−1 [Cr(VI)]. Moreover, it met the maximum contaminant level requirements recommended by World Health Organization (WHO); 10 ppm for As(V) and 50 ppm for Cr(VI) in 10 and 20 min, respectively. Furthermore, Au nanoparticles were successfully introduced in the MF-LDO hollow nanospheres, and the products showed a conversion rate of 100% for the reduction of 4-nitrophenol into 4-aminophenol within 5 min. It is believed that these excellent and versatile abilities integrated with a facile synthetic strategy will facilitate the practical application of this material in cost-effective wastewater purification.