本文選題：納米顆粒 + 聚偏氟乙烯�。� 參考：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：金屬納米顆粒具有良好的催化性能,但是在使用的過程中會(huì)因表面能較高而發(fā)生團(tuán)聚現(xiàn)象,從而影響催化劑的催化性能。因此,選擇合適的載體和負(fù)載方法來負(fù)載和固定納米粒子是很有必要的。本論文展示了兩種方法來改性PVDF膜并在其中負(fù)載和固定金屬納米顆粒,并研究了所得催化膜的催化性能。1,通過聚多巴胺來負(fù)載和固定銀納米粒子。首先把PVDF粉末分散在多巴胺溶液中,多巴胺發(fā)生氧化自聚合作用,從而在PVDF粉末的表面涂覆一層聚多巴胺(PDA)。利用改性后的粉末制備基膜,然后把基膜浸泡在硝酸銀溶液中,利用PDA的粘附性和還原性來負(fù)載和固定銀納米顆粒。通過傅里葉變換紅外光譜(FTIR)、X-射線光電子能譜儀(XPS)、掃描電子顯微鏡(SEM)、接觸角測(cè)量?jī)x等對(duì)所制備的膜進(jìn)行了表征。催化實(shí)驗(yàn)顯示:所制備的催化膜對(duì)p-硝基苯酚的還原反應(yīng)具有很好的催化性能:利用切向流和滲透流對(duì)p-硝基苯酚轉(zhuǎn)化率的差異可實(shí)現(xiàn)反應(yīng)物和產(chǎn)物的初步分離。另外,制備的催化膜對(duì)羅丹明B(RhB)也具有很好的催化和分離作用。2,利用聚甲基丙烯酸(PMAA)來負(fù)載和固定鈀納米粒子。首先通過蒸餾沉淀法制得PMAA微球,然后把PMAA微球和PVDF粉末共混制備了基膜,再將所得膜經(jīng)堿處理后利用原位還原法負(fù)載和固定了鈀納米顆粒,最后在所得膜的表面涂覆一層隔離層,得到催化膜。實(shí)驗(yàn)研究了不同催化劑含量、不同固含量涂層等條件對(duì)p-硝基苯酚的催化分離的影響。結(jié)果顯示涂層可以顯著提高p-硝基苯酚滲透過催化膜時(shí)的單次轉(zhuǎn)化率。
[Abstract]:Metal nanoparticles have good catalytic performance, but in the process of use, due to the high surface energy, the phenomenon of agglomeration will occur, thus affecting the catalytic performance of the catalyst. Therefore, it is necessary to select appropriate carriers and loading methods to load and immobilize nanoparticles. In this paper, we show two methods to modify PVDF membrane and support and immobilize metal nanoparticles in it, and study the catalytic performance of the obtained membrane. 1. The silver nanoparticles are supported and immobilized by polydopamine. First, the PVDF powder was dispersed in the dopamine solution, and the dopamine was oxidized and self-polymerized, and then the surface of the PVDF powder was coated with a layer of polydopamine. The base film was prepared from the modified powder and then immersed in silver nitrate solution. The silver nanoparticles were loaded and fixed by the adhesion and reduction of PDA. The films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and contact angle measurement. The catalytic experiments show that the prepared membrane has good catalytic performance for the reduction of p-nitrophenol. The initial separation of reactants and products can be realized by using the difference of conversion of p-nitrophenol in tangential flow and osmotic flow. In addition, the prepared catalytic membrane also has a good catalytic and separation effect on Rhodamine Bhh RhB. PMAA was used to support and immobilize palladium nanoparticles. First, PMAA microspheres were prepared by distillation precipitation method, then the base membrane was prepared by blending PMAA microspheres with PVDF powder. After alkali treatment, palladium nanoparticles were loaded and immobilized by in-situ reduction method. Finally, the catalytic membrane was obtained by coating an isolating layer on the surface of the film. The effects of different catalyst content and solid content coating on the catalytic separation of p-nitrophenol were studied. The results showed that the single conversion rate of p- nitrophenol percolation overcatalytic membrane could be significantly improved by the coating.
【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ051.893;O643.32

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相關(guān)期刊論文 前1條

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本文編號(hào)：1815178