玉米芯-环糊精交联复合材料对染料分子的吸附性能

Adsorption properties of corncob and cyclodextrin crosslinked composites for dye molecules

以玉米芯和β-环糊精为原料,通过一锅法制备了玉米芯-β-环糊精复合材料(CB-β-CD),通过FTIR、SEM、BET、热重分析仪对其进行了表征。考察了CB-β-CD对酸性品红(AF)和孔雀石绿(MG)在不同吸附条件下的吸附性能。结果表明,20 mL染料初始质量浓度为30 mg/L,加入10 mg吸附剂,吸附3 h,CB-β-CD对MG和AF的最大吸附量分别为52.16 mg/g和58.04 mg/g。MG在碱性条件下更有利于吸附剂的吸附,AF在酸性条件下更有利于吸附剂的吸附。AF和MG的吸附更符合准二级动力学模型和Langmuir等温吸附模型,整个吸附过程以单分子层化学吸附为主。经过5次循环使用,该材料的吸附性能仍可达到90%以上。

Corncob-β-cyclodextrin composites(CB-β-CD)were synthesized in one-pot using corncob andβ-cyclodextrin as raw materials.CB-β-CD Were characterized by FTIR,SEM,BET and thermogravimetry.The adsorption performance of CB-β-CD was tested by adsorbing dye molecules(AF)and MG under different conditions.The results showed that the initial mass concentration of 20 mL dye was 30 mg/L and add long adsorbent the adsorption time was 3 h,the maximum adsorption amounts of CB-β-CD for MG and AF were 52.16 mg/g and 58.04 mg/g,respectively.The adsorption of MG was better under alkaline conditions,while AF was adsorbed better under acidic conditions.The adsorption of AF and MG is more in line with the quasi second-order kinetic model and Langmuir isotherm adsorption type,and the adsorption process is mainly single-molecule layer and chemical adsorption.After five cycles of reuse,the adsorption performance of the material can still reach above 90%.