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利用Langmuir和Freundlich等温方程、准一级及准二级动力学方程对实验数据进行拟合分析,研究了高粱秸秆生物炭(SSB)对水溶液中Cr(Ⅵ)的吸附热力学与动力学行为。结果表明:SSB对Cr(Ⅵ)的等温吸附规律可用Langmuir吸附等温方程描述,吸附过程较好的符合准一级动力学方程。吸附过程的ΔG0<0、ΔH0>0,且仅为13.874kJ/mol,ΔS0>0,说明SSB对Cr(Ⅵ)的吸附是以物理吸附为主的自发吸热过程。
Based on the Langmuir and Freundlich isothermal equations, quasi-first-order and second-order kinetic equations, the experimental data were fitted and analyzed. The adsorption thermodynamics and kinetic behavior of sorbent sorption straw biochar (SSB) on Cr (Ⅵ) in aqueous solution were studied. The results show that the isothermal adsorption of Cr (Ⅵ) by SSB can be described by the Langmuir adsorption isotherm equation, and the adsorption process is in good agreement with the quasi-first-order kinetic equation. ΔG0 <0, ΔH0> 0, and only 13.874 kJ / mol, ΔS0> 0, indicating that adsorption of Cr (Ⅵ) by SSB is a spontaneous endothermic process based on physical adsorption.