摘要
以铁改性纳米纤维素[Fe(OH)3@CNFs]为吸附剂进行动态吸附除磷试验,探究了不同柱高和不同流速对Fe(OH)3@CNFs吸附磷性能的影响。结果表明:吸附柱填充越高(6~16cm),进水流速越慢(5~10mL/min),吸附达到平衡所需时间越长,越有利于Fe(OH)3@CNFs对磷的动态吸附。采用NaOH溶液对吸附剂解吸进行原位再生,再生后吸附柱对磷的吸附量为原吸附柱的83%,表明Fe(OH)3@CNFs材料具有较好的再生能力。通过Yoon-Nelson模型计算吸附50%目标污染物所需的时间,拟合值与实验值的平均相对偏差在1.8%~6.9%之间,表明Yoon-Nelson模型能够很好地描述Fe(OH)3@CNFs材料对磷的动态吸附行为。使用红外光谱和X射线光电子能谱对吸附机理进行分析发现Fe(OH)3@CNFs材料对磷具有吸附能力,并且吸附后主要以FePO4和Fe2(HPO4)3的形式存在。利用吸附柱对生活污水处理厂二沉池出水进行动态吸附,在流速为10mL/min、填装高度为12cm的条件下,饱和时的吸附容量为34.5mg/g。
The iron-modified nanocellulose(Fe(OH)3@CNFs)was used as an adsorbent for dynamic phosphorus removal experiments,and the effects of different column heights and different flow rates on Fe(OH)3@CNFs phosphorus adsorption performance were investigated.The results showed that the higher the packing column(6-16cm)and the slower the flow velocity of the water(5-10mL/min),the longer the time required for the adsorption to reach equilibrium and the more favorable for Fe(OH)3@CNFs to phosphorus dynamic adsorption.The NaOH solution was used to desorb the adsorbent for in-situ regeneration.After regeneration,the adsorption capacity of the adsorption column was 83%of the original adsorption column,indicating that the Fe(OH)3@CNFs material had a good regeneration capacity.The Yoon-Nelson model was used to calculate the time required to adsorb 50%of the target pollutants.The average relative deviation between the fitted value and the experimental value was between 1.8%and 6.9%,which showed that the Yoon-Nelson model could well describe the dynamic adsorption behavior of phosphorus by Fe(OH)3@CNFs materials.Using FTIR and XPS to analyze the adsorption mechanism,it was found that Fe(OH)3@CNFs material had the ability to adsorb phosphorus,and mainly existed as FePO4 and Fe2(HPO4)3 after adsorption.The adsorption column was used to dynamically adsorb the effluent from the secondary sedimentation tank of the domestic sewage treatment plant,and at a flow rate of 10 mL/min and a packing height of 12cm,the adsorption capacity at saturation was 34.5mg/g.
作者
袁林
陈滢
刘敏
王婷庭
YUAN Lin;CHEN Ying;LIU Min;WANG Tingting(College of Architecture and Environment,Sichuan University,Chengdu 610065,Sichuan,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2020年第7期2907-2914,共8页
Chemical Industry and Engineering Progress
基金
四川省重大科技专项项目(2019YFS0501)。
关键词
铁改性纳米纤维素
动态吸附
磷
再生
iron-modified nanocellulose
dynamic adsorption
phosphorus
regeneration
