本文選題：π-π共軛 + 核殼結(jié)構(gòu)��； 參考：《華北理工大學(xué)》2017年碩士論文

【摘要】：在光催化領(lǐng)域廣泛研究的TiO_2和Zn O等催化劑存在僅能利用紫外線以及量子效率較低等缺點(diǎn),其催化能力還不能滿足在環(huán)境凈化領(lǐng)域大規(guī)模應(yīng)用的需求。具有共軛π結(jié)構(gòu)的導(dǎo)電聚合物由于具有較強(qiáng)的可見(jiàn)光吸收能力以及在電荷傳輸過(guò)程中能加速電荷分離而獲得廣泛重視。聚苯胺(PANI)和聚吡咯(PPy)作為共軛π材料的典型代表,因其較高的電荷遷移速率、良好的熱穩(wěn)定性、環(huán)境穩(wěn)定性以及優(yōu)良的電子和空穴的傳輸能力,被稱為目前具有希望得到實(shí)際應(yīng)用的共軛導(dǎo)電高分子。通過(guò)π-π共軛導(dǎo)電聚合物包覆Ag_3PO_4,合成核殼結(jié)構(gòu)的可見(jiàn)光催化劑:Ag_3PO_4@PANI、Ag_3PO_4@PPy。采用多種表征考察復(fù)合光催化劑的形貌、結(jié)構(gòu)、光學(xué)特性以及降解有機(jī)污染物的能力。通過(guò)紅外以及XPS分析證明PANI和Ag_3PO_4形成了強(qiáng)烈的化學(xué)鍵合作用;光電測(cè)試證明Ag_3PO_4@PANI具有良好的電荷遷移效率,與淬滅實(shí)驗(yàn)結(jié)合研究PANI和Ag_3PO_4復(fù)合后降解污染物的機(jī)理。Ag_3PO_4@PANI(5 wt.%)在可見(jiàn)光下對(duì)苯酚和2,4-二氯酚的的降解率高達(dá)100%和95.3%,分別是純Ag_3PO_4的1.4倍和1.3倍;5次循環(huán)后,Ag_3PO_4@PANI的催化活性仍保持在85%以上,而機(jī)械混合催化劑M-Ag_3PO_4/PANI以及單體Ag_3PO_4降解率僅為42%和27%,實(shí)驗(yàn)表明PANI包覆Ag_3PO_4極大地增強(qiáng)了磷酸銀的光穩(wěn)定性;同理,通過(guò)活性測(cè)試證明Ag_3PO_4@PPy對(duì)苯酚的降解效率高達(dá)100%,對(duì)2,4-二氯酚測(cè)試后同樣證明有很高的催化性能,24 min內(nèi)可將97.5%的2,4-二氯酚降解。核殼型催化劑具有高穩(wěn)定性和光催化性能是由于磷酸銀和π-π共軛聚合物之間的協(xié)同作用,殼層結(jié)構(gòu)促進(jìn)兩者接觸面積增大,能級(jí)結(jié)構(gòu)相互匹配以及兩者產(chǎn)生的化學(xué)鍵作用,此外還有導(dǎo)電聚合物的π-π共軛作用,極大的提高了光生空穴和電子的分離和遷移速率,明顯增強(qiáng)了磷酸銀的光催化性能以及穩(wěn)定性。
[Abstract]:The catalysts such as TiO_2 and Zno, which have been widely studied in the field of photocatalysis, have the disadvantages of only utilizing ultraviolet light and low quantum efficiency, and their catalytic ability can not meet the needs of large-scale application in the field of environmental purification. Conductive polymers with conjugated 蟺 structure have attracted much attention due to their strong visible light absorption and the ability to accelerate charge separation during charge transmission. Polyaniline (pani) and polypyrrole (Pyrrolidine) are typical representatives of conjugated 蟺 materials because of their high charge transfer rate, good thermal stability, environmental stability and excellent electron and hole transport ability. It is called the conjugated conductive polymer which has the hope of practical application at present. Through 蟺-蟺 conjugated polymer coated with Ag3PO4, the visible light catalyst of core-shell structure was synthesized. The morphology, structure, optical properties and the ability to degrade organic pollutants of the composite photocatalysts were investigated by various characterizations. Infrared and XPS analysis proved that PANI and Ag_3PO_4 formed strong chemical bond cooperation, and optoelectronic test proved that Ag_3PO_4@PANI has good charge transfer efficiency. Study on Mechanism of degradation of Pollutant after PANI and Ag_3PO_4 Composites with quenching experiment. Ag-S _ 3PO _ 4R _ PANI5wt.) degradation rates of phenol and 2o _ 4-dichlorophenol in visible light are as high as 100% and 95.3% respectively, which are 1.4 times of that of pure Ag_3PO_4 and 1.3 times of that of Ag_3PO_4 after 5 cycles. The catalytic activity of Ag3PO _ 4follow-up pani is as high as 100% and 95.3%, respectively. Still above 85%, However, the degradation rates of M-Ag_3PO_4/PANI and monomer Ag_3PO_4 were only 42% and 27% respectively. The results showed that PANI coated Ag_3PO_4 greatly enhanced the photostability of silver phosphate. The degradation efficiency of phenol by Ag_3PO_4@PPy was as high as 100 by activity test, and the degradation of 97.5% of 2-trichlorophenol in 24 min was also proved by the test of 2-di-4-dichlorophenol. The core-shell catalyst has high stability and photocatalytic performance because of the synergism between silver phosphate and 蟺-蟺 conjugated polymer, the shell structure promotes the increase of contact area, the matching of energy level structure and the chemical bond between them. In addition, the 蟺-蟺 conjugation of conducting polymers greatly improves the separation and migration rate of photogenerated holes and electrons, and obviously enhances the photocatalytic performance and stability of silver phosphate.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O643.36;O644.1

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相關(guān)期刊論文 前3條

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本文編號(hào)：1850348