关键词: FONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">稻壳；活性炭；直接耐酸性枣红；吸附热力学；吸附动力学

Abstract:

The activated carbon was prepared from silicon-freed rice hull by using phosphoric acid as activating agent.The effects of impregnation ratio, concentration of phosphoric acid solution, calination temperature and calination time were studied.The experimental results showed that the suitable condition for preparation of the activated carbon was impregnation ratio 2∶1, concentration of phosphoric acid solution 50%, calination temperature 500℃, and calination time 1 h.The activated carbon was characterized by means of X-ray diffraction(XRD), Brunauer-Emmett-Teller(BET), Fourier transform infrared spectra(FTIR), X-ray energy dispersive spectrum(EDS）and high resolution transmission electron microscopy(HRTEM）techniques.The kinetic and thermodynamic parameters for the absorption of direct fast bordeaux in aqueous solution by the activated carbon were studied.The study on the thermodynamic behavior indicates that the absorption of direct fast bordeaux obeys the Langmuir isotherm model.The adsorption enthalpy is 61.31 kJ·mol^-1, the Gibbs free energy is -39.99—-28.71 kJ·mol^-1, and the entropy is about 297 J·mol^-1·K^-1, so the adsorption process is endothermic and spontaneous.The study on kinetic parameters shows that the absorption is best described by the intra-particle diffusion model, and the apparent activation energy is determined to be 33.34 kJFONT-SIZE: 10.5pt, mso-bidi-font-size: 11.0pt, mso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA">稻壳；活性炭；直接耐酸性枣红；吸附热力学；吸附动力学