摘要
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 m L·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。
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 ram）, feed flow rate （2.7 to 8.1 mL · min-l）, and initial aniline concentration （50 to 200 mg · L-l） were studied and the corresponding break- through curves were obtained. The bed depth service time （BDST） model was applied to simulate the column ad- sorption data, and the results indicated that the modified sawdust was efficient in aniline adsorption. The increas- ing filler height resulted in an extension of the breakthrough time and higher removal efficiency, which both de- crease with an elevated influent flow rate and initial concentration. The BDST model was suitable for describing the kinetics of fixed-bed adsorption （ C/Co = 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 break- through time can also be forecasted by the BDST model.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期4663-4667,共5页
Chinese Journal of Environmental Engineering
基金
国家水体污染治理与控制重大专项(2012ZX07205-005)
关键词
木屑
苯胺
动态吸附
穿透曲线
BDST模型
sawdust
aniline
dynamic adsorption
breakthrough curve
BDST model
