Isothermal equilibrium adsorption analysis of Weihe River´s sediment to nitrobenzene

Study the adsorption characteristic of nitrobenzene in the Weihe River sediment through masse balanced experimental method. The results show that: (1) In isothermal non-equilibrium process, important factors impacting the absorption speed of nitrobenzene in river sand sample and floodplain sand sample with the lower organic carbon (0.25 to 0.46%) are hole filling and capillary condensation. For the river silt and soil sample with the higher organic carbon content (0.88~0.92%), organic carbon content is the key factor impacting the adsorption speed and the final quantity of adsorption. (2)The modified dual-mode model consisting of linear and Langmuir equations, has the highest relevance of experimental data (R²), they are able to better describe the specific solid, liquid adsorption system, such as Weinberg equilibrium in the adsorption process, the maximum adsorption capacity (S₀) of the order: silt>; terrace silt sample>; the river sand sample>; floodplain sand sample. (3) Solid medium and adsorption specific surface area was positively related to changes in pH adsorption system had little effect on adsorption.