甜菜碱OSB-12@高岭土杂化材料对染料吸附机理研究

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实验设计以硅酸铝为实体框架、十二烷基乙氧基磺基甜菜碱(OSB-12)为功能有机物,通过共沉淀法合成同时吸附阴、阳离子染料的纳米材料.借助FT-IR,SEM以及比表面孔隙分析等多种手段表征该吸附材料的结构、形貌.材料通过静电纺丝制备成微米纤维,解决了材料的便捷、完全回收问题,且对阴、阳离子染料均有良好吸附效果,吸附速率快.结果表明,弱酸性桃红B和碱性艳蓝BO吸附量分别达到471和847 mg/g,论文详细讨论了染料的吸附机理,电荷作用在离子型染料吸附过程中起主导作用,即包埋在材料中的两性表面活性剂OSB-12发挥着离子交换的功能.从染料去除率和材料分离性能等可以预见,该材料在实际染料废水处理中体现了良好的应用潜力.“,”A new nano-sized inorganic/organic (IO) hybrid material was synthesized by self-assembly of OSB-12 into lay- ered aluminum silicate via a coprecipitation method. The process of the fabrication of hybrid material consisted of the fol- lowing steps. Firstly, aluminum nitrate and OSB-12 were homogeneous mixed in the water. Thereafter, sodium silicate was slowly added in. Elemental analysis indicated that the combination ratio of aluminum silicate and OSB-12 was 2.2 : 1. The hybrid was characterized by Zeta potential, Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), trans- mission electron microscope (TEM) and surface area and porosity analyzer. The results showed that OSB-12 was inserted into the aluminum silicate layer in hydbrid material with lamellar and porous structure. Based on the amphiphilic characteris- tic of OSB-12, the resulted hybrid could be used as a sorbent to cationic and anionic dyes simultaneously. Meanwhile, the micron fiber contained hybrid and polyacrylonitrile (PAN) was also prepared by electrospinning, which can provide a con- venient recycle of sorbent from water. Various factors affecting the adsorption were investigated. Under the optimum condi- tions, the maximum adsorption capacity was 471 mg/g of cationic (weak acid pink red B) and 847 mg/g of anionic dyes (vic- toria blue BO) respectively. The adsorptions process obeyed the Langmnir isothermal model and Frendlich isothermal model, because of the electric charge attraction playing a key role between ionic dye and OSB-12 embedding in the hybrid sorbent. The changes of Zeta potential of dye solution confirmed the point. In addition, the reused of the waste fiber was also been considered, the fiber was roasted in high temperature (600 ~C) to obtain a porous kaolin material which had tremendous ad- sorption capacity to heavy metal, the adsorption capacity was more than 8.3 mg/g of Cr3~. It can be predicted that the hybrid had a tremendous application potential in dye wastewater treatment from dye removal efficiency and material separation properties.
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