改性木屑对水中苯胺的动态吸附

采用β-环糊精对木屑改性用于吸附苯胺，通过固定床实验考察了吸附床高度（10~30 mm）、进水流速（2.7~8.1 mL·min-1）和苯胺初始浓度（50~200 mg·L-1）对穿透曲线的影响，同时使用BDST模型对吸附穿透曲线进行拟合。结果表明，改性木屑可以有效吸附苯胺，随着高度的增加，穿透时间延长，固定床对苯胺的去除率增大；随着苯胺进水流速和初始浓度的增加，穿透时间缩短，固定床对苯胺的去除率降低；BDST模型对穿透曲线的拟合效果较好（Ct/C0=0.7，R2=0.999 0），随着运行时间的增加，固定床的吸附速率常数（Ka）变小，对苯胺的吸附量（N0）增大；当改变流速时，运用该模型能较准确的预测吸附固定床的操作时间。

Dynamic adsorption of aniline in water on modified sawdust

Sawdust modified by β-cyclodextrin was used as an adsorbent for aniline removal in a fixed bed. The effects of some parameters such as, bed height (10 to 30 mm), feed flow rate (2.7 to 8.1 mL·min-1), and initial aniline concentration (50 to 200 mg·L-1) were studied and the corresponding breakthrough curves were obtained.The bed depth service time (BDST) model was applied to simulate the column adsorption data, and the results indicated that the modified sawdust was efficient in aniline adsorption. The increasing filler height resulted in an extension of the breakthrough time and higher removal efficiency, which both decrease with an elevated influent flow rate and initial concentration. The BDST model was suitable for describing the kinetics of fixed-bed adsorption (Ct/C0=0.7, R2=0.999 0), and growing running times result in a lower rate constant (Ka) and higher adsorption capacity (N0). When the influent flow rate is changed, the breakthrough time can also be forecasted by the BDST model.