纳米TiO_(2)/β-环糊精二元改性活性炭的制备及应用

The Preparation and Application of Nano TiO_(2)/β-cyclodextrin Binary Modified Activated Carbon

将纳米TiO_(2)交联在β-环糊精上,形成纳米TiO_(2)/β-环糊精,然后以活性炭为载体,制备纳米TiO_(2)/β-环糊精二元改性活性炭,以pH、温度、浓度、时间为限制条件在废水环境下对Pb^(^(2+))、Cd^(2+)、Cu^(2+)、Zn^(2+)四种金属离子进行模拟吸附,用火焰原子吸收分光光度计测出样品中的重金属离子含量.结果进行比较得出吸附最佳条件:pH为弱酸条件下表现较好;最佳吸附温度是25~30℃,该条件下吸附效率为90%左右;随吸附剂的加入,吸附效果稳步提高,在0.7 g左右除去率已达到85%;最佳吸附时间为1.5 h时,改性后时间更占优势且除去效果更佳.

By delivering nano TiO_(2) andβ-cyclodextrin,we got nano TiO_(2)/β-cyclodextrin,then prepared the nano TiO_(2)/β-cyclodextrin binary modified activated carbon with activated carbon as the carrier.By taking p H,temperature,concentration and time as restricted conditions,the simulated adsorptions of metal ions Pb^(2+),Cd^(2+),Cu^(2+)and Zn^(2+)in the waste water environment were carried out.The contents of heavy metal ions in the samples were measured by flame atomic absorption spectrophotometer.The optimum adsorption conditions were obtained by comparing the results.At weakly acidic p H,the nano TiO_(2)/β-cyclodextrin binary modified activated carbon has good adsorption effect.The best adsorption temperature is 25-30℃,and the removal rate is about 90%.With the addition of the adsorbent,the effect increased steadily,and the removal rate reached 85%at the adsorbent dose about 0.7 g.When the adsorption time is 1.5 h,the removal effect is better and more efficient.