现代纺织技术 ›› 2023, Vol. 31 ›› Issue (3): 172-181.

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β-环糊精多孔材料的制备及其模拟印染废水中亚甲基蓝的吸附性能

  

  1. 1.浙江理工大学纺织科学与工程学院,杭州310018; 2.浙江理工大学绍兴柯桥研究院有限公司,浙江绍兴312030; 3.浙江省清洁染整技术研究重点实验室,浙江绍兴312000
  • 收稿日期:2022-11-04 出版日期:2023-05-10 网络出版日期:2023-05-25
  • 作者简介:郝星(1995—),男,安徽安庆人,硕士研究生,主要从事功能高分子材料方面的研究。
  • 基金资助:
    浙江省清洁实验室开放基金项目(QJRZ2112);浙江理工大学柯桥研究院培育项目(KYY2021001S);浙江理工大学科研启动基金项目(21202087-Y)

Preparation of β-cyclodextrin porous materials and their adsorption of methylene blue in simulated dyeing wastewater

  1. 1. College of Textile Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2. Zhejiang Sci-Tech University Shaoxing Keqiao Research Institute Co., Ltd. , Shaoxing 312030, China; 3. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing 312000, China
  • Received:2022-11-04 Published:2023-05-10 Online:2023-05-25

摘要: 为了开发新型高效的吸附材料以实现对印染废水的高效处理,采用β-环糊精(β-CD)、甲基丙烯酸酐(MA)、对苯乙烯磺酸钠(SS)为原料,通过脱水缩合反应及碳碳双键加成反应制备含有磺酸基团(−SO3H)多孔结构的β-环糊精基交联聚合物(S-M-β-CD)。测试分析S-M-β-CD的微观结构特性以及对印染废水中亚甲基蓝(MB)的吸附性能,结果表明:S-M-β-CD为表面粗糙的多孔纳米微球,表面富含羟基(−OH)和磺酸基团(−SO3H),可以为MB提供大量的结合位点。S-M-β-CD对亚甲基蓝(MB)的吸附过程符合拟二级吸附动力学模型和Langmuir等温吸附模型,对MB表现出良好的循环吸-脱附性,经7次循环吸-脱附后,S-M-β-CD对MB的吸附效率可达98.15%。S-M-β-CD作为新型吸附材料,对实现印染废水的低成本、高效处理具有重要意义。

关键词: β-环糊精, 多孔材料, 印染废水, 吸附, 循环

Abstract: As an important basic force of people's livelihood industry and a pillar industry of national economic development, China's textile industry has made remarkable development achievements. However, the environmental problems caused by the discharge of printing and dyeing wastewater cannot be ignored. According to incomplete statistics, the water consumption of one ton of textiles in China is 100~200 tons, and the large amount of wastewater discharge increases the difficulty of water treatment. In order to remove the pollutants with complex composition in printing and dyeing wastewater, the common printing and dyeing wastewater treatment methods including the physical method, the chemical method and the biological method are adopted. Among them, the adsorption method in the physical method is simple in operation, low in cost and energy consumption, and causes no secondary pollution. It can not only effectively decolorize, but can also adsorb heavy metal ions, remove substances that are not easily degraded chemically and biologically in water. In addition, most of the adsorption process is reversible, which can make the adsorption material be recycled through the desorption process. It is especially suitable for the treatment of printing and dyeing wastewater with increasingly complex components and has broad application prospects.
However, the pollutant removal performance of traditional adsorption materials is difficult to meet the requirements of printing and dyeing wastewater treatment, and the recycling performance is poor and the energy consumption is large. β-cyclodextrin is a cyclic oligosaccharide composed of glucose molecules linked by α-1,4 glycosidic bonds and is naturally non-toxic, cheap and easy to obtain, and biocompatible. It has a large number of hydroxyl groups on the outside, which can be modified by a variety of functional groups to obtain β -cyclodextrin derivatives. The internal special cavity structure can envelope a variety of organic/inorganic pollutant molecules. In the synthesis and application of β-cyclodextrin-based adsorption materials, it is often necessary to modify or graft β-CD to prepare water-insoluble β-CD-based adsorption materials and enhance their application effect. At present, there are mainly two types of β-CD crosslinked polymer adsorption materials and chemically immobilized β-CD-based adsorption materials.
In this paper, β-cyclodextrin (β-CD), methacrylic anhydride (MA) and sodium p-styrene sulfonate (SS) were used as raw materials to prepare the crosslinked polymer S-M-β-CD containing sulfonic acid group (SO3H) by dehydration condensation reaction and carbon-carbon double bond addition reaction. The microstructure characteristics of S-M-β-CD were studied. The adsorption mechanism of S-M-β-CD for methylene blue (MB) was analyzed. It is concluded that S-M-β-CD is a spherical block structure with rough, porous and uneven surface, and contains a large number of mesopores and trace micropores, which are helpful for the adsorption of pollutant MB. S-M-β-CD can still maintain 98.15 % adsorption rate for MB after seven cycles of desorption-adsorption, indicating that it has excellent adsorption-desorption properties. When the pH of MB solution is 9, the adsorption effect of S-M-β-CD on MB is the best, and the adsorption rate is close to 99.00 %. The adsorption process of MB by S-M-β-CD is more in line with the pseudo-second-order kinetic model and Langmuir isothermal adsorption model, that is, the adsorption process is monolayer adsorption dominated by chemical adsorption and synergistic effect of physical adsorption.
It has been more than 120 years since Villiers discovered cyclodextrin. β-CD has been widely sought after by researchers for its special spatial structure. Nowadays, the synthesis and development of adsorption materials based on β-cyclodextrin have attracted more and more researchers' attention. Based on the systematic study of S-M-β-CD adsorption materials, we hope to provide feasible research ideas and methods for the development and application of new adsorption materials with low cost and high efficiency.

Key words: β-cyclodextrin, porous material, dyeing wastewater, adsorption-desorption, recyclability

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