| The nitrogen-doped activated carbon was prepared from tea shell.The deacidification and bleaching of oil-tea camellia seed oil was carried out simultaneously by the adsorption process of macroporous resin and nitrogen-doped tea shell activated carbon. The preparation conditions of nitrogen-doped tea shell activated carbon were optimized and the quality indexes of oil-tea camellia seed oil were determined. The results showed that the optimal preparation conditions of nitrogen-doped tea shell activated carbon were obtained as follows: tea shell activated carbon as carbon source, imidazole as nitrogen source, imidazole concentration 0.3 mol/L, activation temperature 850 ℃, activation time 60 min. Under the optimal conditions, the specific surface area of nitrogen-doped tea shell activated carbon was 2 876 m2/g and the total pore volume was 1.55 cm3/g, in which the micropore volume, the middle pore volume and the large pore volume were 0.65, 0.55, 0.35 cm3/g, respectively. The oil-tea camellia seed oil obtained was colorless and transparent, with acid value 0.14 mgKOH/g, peroxide value 0.50 mmol/kg, which met the quality standard of oil-tea camellia seed oil for medical injection. |
