聚醚改性硅油胶束用于制备染料降解催化剂的研究
发布时间：2018-07-17 02:40
【摘要】：有机染料在纺织印染工业中被广泛使用,印染废水中染料的除去一直是纺织印染领域一个长期关注的焦点问题。其中,基于高级氧化法的染料催化降解方法是一主要研究方向,研究开发各种有效的染料降解催化剂也是一个重点关注的研究课题。鉴于两亲性聚醚改性硅油独特的表面活性,本文创新性的利用聚醚改性硅油胶束作为微纳米反应器进行原位负载型催化剂的制备,并用于染料降解的研究。本文通过硅氢加成反应制备得到一系列不同结构的聚醚改性硅油,并研究了其在不同溶剂中的自组装行为,考察了不同因素对其聚集态的影响。随之利用自组装形成的聚醚改性硅油胶束作为微纳米反应器,通过煅烧制得了原位负载型催化剂Co3O4/SiO2并用于染料降解。主要研究成果如下:一、通过硅氢加成反应合成得到一系列不同结构的聚醚改性硅油(PDMS-g-PEO/PO)接枝共聚物。1、以聚硅氧烷(PHMS)为主链,烯丙基聚氧乙烯醚(PEO/PO)为支链,铂为催化剂,60℃反应温度下,通过硅氢加成法制备得到一系列不同结构的聚醚改性硅油。2、利用傅里叶变换红外光谱仪(FTIR)和核磁共振氢谱(1H NMR)进行表征,发现产物结构明晰,并与设计的分子结构一致。二、通过PDMS-g-PEO/PO的溶液自组装,获得球形、棒状、囊泡状等多种形态的聚集体。1、利用芘(Py)作为荧光探针,测得了PDMS-g-PEO两亲性共聚物在不同溶剂中的临界胶束浓度,考察了临界胶束浓度随组成的变化规律。研究表明,疏水性的硅氧烷链段越长,亲水性的聚醚链段越多,其临界胶束浓度越大。聚合物在丙酮和水的混合溶剂中的临界胶束浓度值大于在水溶液中的临界胶束浓度值。2、利用TEM表征手段,考察了两亲性有机硅接枝共聚物在共聚物分子组成、陈化时间、溶剂性质及温度等因素对溶液中自组装聚集体的形态变化特征的影响。研究发现,随着陈化时间的延长,小囊泡(球状)聚集融合转变为大囊泡或复合囊泡。随着温度的升高,胶束的形态由球状转变为棒状,且尺寸也进一步增大。两亲性共聚物在不同的分子组成中和不同的溶剂中,胶束化行为也有所不同。三、利用聚醚改性硅油胶束作为微纳米反应器,通过煅烧制备得到Co3O4/SiO2原位负载型催化剂。1、利用TEM、XPS、XRD考察了催化剂的形貌、元素组成及晶型。与不加催化剂相比较,加入催化剂后,甲基橙的降解率明显提高。2、考察了煅烧温度、煅烧时间、搅拌速率等因素对催化剂性能的影响。结果表明,在煅烧温度为700℃、煅烧时间为5 h、搅拌速率为500 r/min时,催化剂的催化性能较好。3、考察了制备的催化剂对不同染料的降解效果。研究结果表明,Co3O4/SiO2对酸性染料、活性染料等常见的染料能够有效地催化氧化。4、经过多次重复降解后,催化剂仍然保持了稳定的催化活性。
[Abstract]:Organic dyes are widely used in textile printing and dyeing industry. The removal of dyes from printing and dyeing wastewater has been a long-term focus in the field of textile printing and dyeing. Among them, the catalytic degradation of dyes based on advanced oxidation method is a main research direction, and the research and development of a variety of effective dye degradation catalysts is also an important research topic. In view of the unique surface activity of amphiphilic polyether modified silicone oil, the in situ supported catalyst was prepared by using polyether modified silicone oil micelle as a micro and nano reactor and used in the degradation of dyes. In this paper, a series of polyether modified silicone oils with different structures were prepared by hydrosilylation reaction. The self-assembly behavior of polyether modified silicone oil in different solvents was studied, and the influence of different factors on the aggregation state was investigated. Then the self-assembled polyether modified silicone oil micelle was used as a micro-nano reactor and the in-situ supported catalyst Co _ 3O _ 4 / Sio _ 2 was prepared by calcination and used for the degradation of dyes. The main results are as follows: first, a series of polyether modified silicone oil (PDMS-g-PEO / PO) grafted copolymers with different structures were synthesized by hydrosilylation reaction. The main chain was polysiloxane (PHMS) and the branching chain was allyl polyoxyethylene oxide ether (PEO / PO). A series of polyether modified silicone oils with different structures were prepared by hydrosilylation at 60 鈩，
本文编号：2128652
[Abstract]:Organic dyes are widely used in textile printing and dyeing industry. The removal of dyes from printing and dyeing wastewater has been a long-term focus in the field of textile printing and dyeing. Among them, the catalytic degradation of dyes based on advanced oxidation method is a main research direction, and the research and development of a variety of effective dye degradation catalysts is also an important research topic. In view of the unique surface activity of amphiphilic polyether modified silicone oil, the in situ supported catalyst was prepared by using polyether modified silicone oil micelle as a micro and nano reactor and used in the degradation of dyes. In this paper, a series of polyether modified silicone oils with different structures were prepared by hydrosilylation reaction. The self-assembly behavior of polyether modified silicone oil in different solvents was studied, and the influence of different factors on the aggregation state was investigated. Then the self-assembled polyether modified silicone oil micelle was used as a micro-nano reactor and the in-situ supported catalyst Co _ 3O _ 4 / Sio _ 2 was prepared by calcination and used for the degradation of dyes. The main results are as follows: first, a series of polyether modified silicone oil (PDMS-g-PEO / PO) grafted copolymers with different structures were synthesized by hydrosilylation reaction. The main chain was polysiloxane (PHMS) and the branching chain was allyl polyoxyethylene oxide ether (PEO / PO). A series of polyether modified silicone oils with different structures were prepared by hydrosilylation at 60 鈩，
本文编号：2128652
本文链接：https://www.wllwen.com/shengtaihuanjingbaohulunwen/2128652.html
