Preparation Of Functional Activated Carbon Composite And Application In Water Treatment

Ce-doped CaAl/layered double hydroxide nano-particles were coated at the surface of activated carbon (CeO2/CaAl-LDHs/AC) by co-precipitation method under an aid of ultrasound, which was characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) techniques. The CeO2CaAl-LDHs nano-particles were well distributed at the surface of AC with a flower-like layer structure. The uptakes of Cr (VI), Pb (II), fluoride and malachite green were investigated at CeO2/CaAl-LDHs/AC in aqueous solution, respectively. All the adsorption processes conformed to pseudo-second-order kinetic model and Langmuir isotherm model. The maximum adsorption capacities of Cr (VI), Pb (II), fluoride and malachite green were 83.06,131.58,61.20 and 420.17 mg/g at pH = 7,45 ℃ and 120 min, respectively.Prussian blue nano-particles were coated at the surface of activated carbon (PB/AC) using homogeneous precipitation method under an aid of ultrasound, which was characterized by FE-SEM, XRD, XPS and FT-IR techniques. Lots of PB nano-particles were well distributed at the surface of AC with a cubic structure. The uptake of cesium (Cs+) was investigated at PB/AC in aqueous solution. The maximum adsorption capacity of Cs+was 49.17 mg/g at pH = 7,45 ℃ and 180 min, the desorption efficiency of Cs+ could reach to 88.51% at pH = 2,45 ℃ and 240 min.Zinc hexacyanoferrate microcrystals were coated at the surface of activated carbon (ZnHCF/AC) by vacuum impregnation method under an aid of ultrasound, which was characterized by FE-SEM, XRD, XPS and FT-IR techniques. The results indicated that ZnHCF microcrystals were well modified at the surface of AC with a cubic structure. Selective adsorption and desorption of cesium (Cs+) were investigated at ZnHCF/AC in aqueous solution, respectively. The maximum adsorption capacity of Cs+ was 58.38 mg/g at pH= 7,45 ℃ and 70 min, the desorption efficiency of Cs+ was 90.76% at pH = 2,45 ℃ and 70 min.