摘要
采用新疆奇台风化煤为原料,通过硝酸氧化制备硝基腐植酸。以硝基腐植酸为吸附剂,研究其对Cr(Ⅵ)的吸附效果,同时建立了硝基腐植酸对Cr(Ⅵ)的吸附热力学及吸附动力学模型。结果表明:新疆奇台风化煤制备的硝基腐植酸对Cr(Ⅵ)具有良好的吸附性能,其等温吸附模型符合Freundlich方程。吸附焓变为-2.719 kJ/mol,?G~θ<0,吸附是自发的放热过程。常温下吸附速率常数K_L为1.943 mg/(g·min),表明其吸附动力学模型符合Langmuir模型和Bingham模型。
Nitro-humic acid was prepared with weathered coal from Qitai, Xinjiang province by nitric acid oxidation. The adsorptive effect ofnitro-humic acid on Cr（Ⅵ） was studied by using nitro-humic acid as the adsorbent. Meanwhile, the nitro-humic acid adsorption thermodynamic and adsorption kinetic models on Cr（Ⅵ） were established. The results showed that nitro-humic acid that prepared from weathered coal of Qitai had good adsorption performance on Cr（Ⅵ）. The isothermal adsorption models of nitro-humic acid accored with Freundlich equation. The adsorption enthalpy of nitro-humic acid for Cr（Ⅵ） was -2.719 kJ/mol, △G^θ〈0, indicating that the adsorption reaction was a spontaneous exothermic process. The adsorption rate constant KL was 1.943 mg/（g ·min） under the ambient temperature showed that the adsorption kinetic models of nitro-humic acid were in agreement with Langmuir model and Bingham model.
出处
《腐植酸》
2017年第6期32-37,共6页
Humic Acid
基金
新疆大学横向课题项目(项目编号201504031077)
