A simple method to prepare magnetic modified beer yeast and its application for cationic dye adsorption
A simple method to prepare magnetic modified beer yeast and its application for cationic dye adsorption
复制标题
DOI：
10.1007/s11356-012-0903-3
复制
发表时间：
2012
影响因子：
5.8
通讯作者：
Jun-xia Yu;Li-yan Wang;R. Chi;Yuefei Zhang;Zhigao Xu;Jia Guo
中科院分区：
文献类型：
--
作者：
Jun-xia Yu;Li-yan Wang;R. Chi;Yuefei Zhang;Zhigao Xu;Jia Guo
本研究的目的是用一种简单的方法制备对阳离子具有良好吸附性能的磁性改性生物质。采用均苯四甲酸二酐（PMDA）在N，N-二甲基乙酰胺溶液中制备磁性改性生物质和超声辅助原位共沉淀法在氨水中制备磁性PMDA改性生物质两步制备磁性改性生物质。以阳离子染料亚甲基蓝和碱性洋红为模型染料，分析了磁性改性生物质的吸附性能。光学显微镜和X射线衍射分析表明，Fe 3 O 4颗粒沉淀在改性生物质表面。所制备的生物吸附剂可以很容易地通过使用外加磁场回收。滴定分析表明，通过使用一阶导数法计算磁性PMDA改性生物质上的官能团的总浓度为0.75 mmol g-1。根据Langmuir方程，磁性PMDA修饰的生物质对亚甲基蓝和碱性洋红的吸附容量（qm）分别为609.0和520.9 mg g−1。动力学实验表明，吸附过程均在150 min内完成.解吸实验表明，磁性吸附剂再生后可重复使用。所制备的磁性改性吸附剂在印染废水处理中具有一定的应用潜力。
The purpose of this research is to use a simple method to prepare magnetic modified biomass with good adsorption performances for cationic ions. The magnetic modified biomass was prepared by two steps: (1) preparation of pyromellitic dianhydride (PMDA) modified biomass inN,N-dimethylacetamide solution and (2) preparation of magnetic PMDA modified biomass by a situ co-precipitation method under the assistance of ultrasound irradiation in ammonia water. The adsorption potential of the as-prepared magnetic modified biomass was analyzed by using cationic dyes: methylene blue and basic magenta as model dyes. Optical micrograph and x-ray diffraction analyses showed that Fe3O4particles were precipitated on the modified biomass surface. The as-prepared biosorbent could be recycled easily by using an applied magnetic field. Titration analysis showed that the total concentration of the functional groups on the magnetic PMDA modified biomass was calculated to be 0.75 mmol g−1by using the first derivative method. The adsorption capacities (qm) of the magnetic PMDA modified biomass for methylene blue and basic magenta were 609.0 and 520.9 mg g−1, respectively, according to the Langmuir equation. Kinetics experiment showed that adsorption could be completed within 150 min for both dyes. The desorption experiment showed that the magnetic sorbent could be used repeatedly after regeneration. The as-prepared magnetic modified sorbent had a potential in the dyeing industry wastewater treatment.