磁性Y/CTS/FA复合吸附剂的制备及对直接湖蓝5B的吸附  

Preparation of Magnetic Y/CTS/FA Composite Adsorbents and Its Adsorption to Direct Lake Blue 5B

作　　者：冯燕霞 李北罡[1] FENG Yanxia;LI Beigang(College of Chemistry and Environmental Sciences,Inner Mongolia Normal University,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学化学与环境科学学院,呼和浩特010022

出　　处：《材料导报》2021年第6期6028-6034,共7页Materials Reports

基　　金：国家自然科学基金(21167011);内蒙古自治区自然科学基金(2015MS0226);内蒙古师范大学自主研发项目(112129K18ZZYF006)。

摘　　要：以燃煤电厂排放的固体废弃物粉煤灰(FA)为基质,通过负载少量壳聚糖(CTS)、稀土钇离子(Y(Ⅲ))及Fe_(3)O_(4)制备出一种稀土掺杂磁性复合吸附剂磁性Y/CTS/FA,利用BET、SEM-EDS、XRD、FT-IR和XPS等对FA和磁性Y/CTS/FA的表面形貌及结构等进行表征,并以初始浓度为2 300 mg/L的直接湖蓝5B(DLB 5B)为吸附对象,详细探究了原料配比及反应时间对复合吸附剂性能的影响和吸附机理。结果表明:室温下,按原料质量比为m(FA)∶m(Y(Ⅲ))∶m(CTS)∶m(Fe3O4)=10∶2∶2∶2先将2%CTS醋酸溶液与FA反应120 min形成CTS/FA凝胶液,然后将其与Y(Ⅲ)离子反应30 min形成Y/CTS/FA凝胶液,再加入Fe3O4进行反应,所得磁性Y/CTS/FA对DLB 5B的吸附效果最佳,吸附量和去除率分别可达533 mg/g、92.7%。吸附剂对DLB 5B的吸附行为符合Langmuir模型。结合吸附染料前后吸附剂的FT-IR和XPS图谱分析结果,说明吸附剂对DLB 5B的吸附主要是物理吸附,同时兼有化学吸附。磁性Y/CTS/FA是一种对高浓度DLB 5B染料废水具有良好净化效果、可实现有效灰水分离的、绿色环保的吸附剂。A rare earth doped magnetic composite adsorbent,magnetic Y/CTS/FA was prepared by loading a small amount of chitosan(CTS),rare earth Y(Ⅲ)ions and Fe_(3)O_(4) on the basis of solid waste fly ash(FA)from coal-fired power plant.The surface morphology and structure of FA and magnetic Y/CTS/FA were characterized by BET,SEM-EDS,XRD,FT-IR and XPS.Taking direct lake blue 5B(DLB 5B)with initial concentration of 2300 mg/L as the adsorption object,the influence of raw material ratio and reaction conditions on the performance of composite adsorbent and the adsorption mechanism were explored in detail.The results showed that the optimal adsorption property of magnetic Y/CTS/FA to the DLB 5B was obtained with raw material mass ratio m(FA)∶m(Y(III))∶m(CTS)∶m(Fe 3O 4)=10∶2∶2∶2 at room temperature,where 2%CTS solution reacted with FA for 120 min to form the CTS/FA gel solution,then it reacted with the Y(III)ions for 30 min to form the Y/CTS/FA gels,Fe 3O 4 was added to form the final magnetic Y/CTS/FA at last,the adsorption capacity and removal rate of adsorbent to DLB 5B can reached 533 mg/g,92.7%,respectively.The adsorption behavior of DLB 5B by the adsorbent is in accordance with Langmuir model.In addition,the results of FT-IR and XPS analysis of dye adsorbed by magnetic Y/CTS/FA before and after adsorption showed that the adsorbent to DLB 5B is mainly physical adsorption,and also has chemical adsorption.Magnetic Y/CTS/FA is a kind of environmental friendly adsorbent which has good purification effect on high concentration DLB 5B dye wastewater and can realize effective ash water separation.

关 键 词：粉煤灰 壳聚糖 稀土离子 磁性吸附剂 

分 类 号：X703[环境科学与工程—环境工程]