FeS负载活化甘蔗渣生物炭吸附Cr(VI)性能研究

Adsorption of Hexavalent Chromium with FeS Coated Activated Bagasse Biochar

本文以甘蔗渣为原材料,成功制备了一种用于Cr(VI)吸附去除的高活性FeS负载KOH改性甘蔗渣多孔生物炭材料(简称FeS-KBC)。采用XRD和FESEM分析了FeS-KBC的晶体结构和表面形貌,系统研究了含Cr(VI)溶液中初始pH、反应时间、Cr(VI)溶度等因素对吸附性能的影响。基于此,本文运用等温吸附模型和动力学模型探索了FeS-KBC的吸附行为和机理。结果表明,FeS-KBC对Cr(VI)的最大吸附量(qm)高达198.21 mg∙g−1。数据拟合结果揭示,FeS-KBC对Cr(VI)的吸附行为遵循Sips等温吸附模型和Elovich模型,表明FeS-KBC对Cr(VI)的吸附主要为单分子层非均匀化学吸附。本研究为开发多孔生物炭材料在含重金属废水处理方面的实际应用奠定了一定的工艺基础和理论指导。

A kind of highly active KOH modified activated porous bagasse biochar material coated with FeS for Cr (VI) adsorption and removal was successfully prepared with bagasse as raw material (FeS-KBC for short). The crystal structure and surface morphology of FeS-KBC was analyzed by diffraction of x-rays (XRD) and field emission scanning electron microscope (FESEM). The effects of initial pH, reaction time and initial solubility of Cr (VI) containing solution on its adsorption performance were systematically studied. The adsorption behavior and mechanism of FeS-KBC were explored by isothermal adsorption models and kinetic models. The results showed that the maximum theoretical adsorption capacity (qm) of Cr (VI) by FeS-KBC was 194.87 mg/g at pH 2. The data fitting results reveal that the adsorption behavior of FeS-KBC on Cr (VI) follows the sips isothermal adsorption model and Elovich model, indicating that the adsorption of FeS-KBC on Cr (VI) is mainly a single molecular layer heterogeneous chemical adsorption. This study has laid a certain technological foundation and theoretical guidance for the development of porous biochar materials in the practical application of heavy metal-containing wastewater treatment.