Preparation and Metal Ion Adsorption Performance for Heavy Metals of Nitrogen-doped Carbon Aerogels Prepared from Cellulose via Hydrothermal Carbonization Method北大核心CSCD

Nitrogen-doped carbon aerogel (NCA) was prepared via hydrothermal carbonization with microcrystalline cellulose(MCC) as precursor and ovalbumin (OVA) as dopant. Here, ovalbumin acted double roles: One was the donor of nitrogen source, the other was the structural directing agent. Morphology, pore structure, crystal structure and surface chemical properties of NCA were characterized by scanning electron microscope (SEM), nitrogen adsorption-desorptiom, X-ray diffraction(XRD), Fourier transform infrared-spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS). Pb2+ and Cr6+ were used as adsorption substrates to explore the adsorption properties of NCA in the aqueous phase. Adsorption equilibria and kinetic behaviour of Pb2+ and Cr6+ were assessed by altering parameters such as agitation time and metal ions' concentration through implementing batch experiments. The results showed that the NCA was amorphous with three-dimensional network structure; specific surface area of NCA was 134.48 m2/g; average pore diameter was 12.28 nm; total pore volume was 0.413 0 m3/g. NCA was mainly composed of element of C, N, O. C〖FY=,*2〗O, -COOH and C-N functional groups were detected on the surface of NCA. N was mainly existed in the form of nitrosyl, amino, pyridine and quaternary ammonium. The adsorption process of Pb2+ and Cr6+ on NCA followed Langmuir model and the pseudo-second-order kinetic model better. NCA exhibited higher adsorption capacity and faster kinetics than CA. The maximum adsorption capacities of Pb2+ and Cr6+ on NCA at 25 ℃ achieved 223.98 mg/g, 35.12 mg/g, respectively and the correspondind capacities on CA were 65.78 and 16.65 mg/g. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.