【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Fe₃O₄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。更多还原

【Abstract】 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 Fe₃O₄ 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 5 B（DLB 5 B） with initial concentration of 2 300 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 5 B was obtained with raw material mass ratio m（FA）∶m（Y（III））∶m（CTS）∶m（Fe₃O₄）=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, Fe₃O₄ was added to form the final magnetic Y/CTS/FA at last, the adsorption capacity and removal rate of adsorbent to DLB 5 B can reached 533 mg/g, 92.7%, respectively. The adsorption behavior of DLB 5 B 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 5 B 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 5 B dye wastewater and can realize effective ash water separation.更多还原