【摘要】 以园林废弃物梧桐树皮为原料,用氯化锌活化制备梧桐树皮活性炭,研究了其对污水中刚果红的吸附性能.采用物理吸附仪、扫描电镜等进行表征,考察了吸附剂用量、吸附时间、振荡速度等因素对刚果红吸附性能的影响,分析了吸附过程的等温线、动力学和热力学特征.结果表明,梧桐树皮活性炭存在大量的中孔结构,孔隙结构发达;增大吸附剂用量可提升对污水中刚果红的吸附效果,吸附在120 min内基本达到平衡;室温,投加量3.0 g/L、吸附时间120 min、振荡速度60 r/min条件下,刚果红的去除率可达98.2%.吸附过程符合Langmuir等温吸附模型和Lagergren准二级动力学模型,吸附过程是自发、吸热的熵增过程.更多还原

【Abstract】 The activated carbon achieved from sycamore bark via activation of zinc chloride was used to dispose Conge red wastewater. The characteristics of sycamore bark activated carbon were characterized by SEM and BET. The effects of adsorbent dosage, time, and shaking speed on the adsorption properties of Congo red by sycamore bark activated carbon were studied. The isotherm, kinetics, and thermodynamics of adsorption were explored. The results revealed that the activated carbon contains many apparent mesopores with well-developed pore structure. Adsorption efficiency was increased with enhancing the adsorption dosage. The adsorption reached equilibrium basically after 120 min. The removal rate of Conge red reached to 98.2% under room temperature with adsorbent dosage of 3.0 g/L, adsorption time of 120 min, shaking speed of 60 r/min. The adsorption of Congo red on sycamore bark activated carbon was followed Langmuir isotherm model and Lagergren pseudo-second order kinetics model. The adsorption is a spontaneous and endothermic entropy increase process.更多还原