本文選題：K_2Ti_4O_9 + 光催化��； 參考：《南京理工大學》2017年碩士論文

【摘要】：近十幾年來,伴隨著可持續(xù)發(fā)展這一主題,全球性環(huán)境問題受到越來越多的關(guān)注,在眾多環(huán)境污染治理技術(shù)中,以半導體材料為催化劑的非均相光催化反應(yīng)由于其具有室溫條件反應(yīng)、深度礦化凈化、可直接利用太陽光作為光源來活化催化劑并驅(qū)動氧化還原反應(yīng)等種種獨特性能,而成為了一種理想的環(huán)境污染治理技術(shù)。層狀K_2Ti_4O_9是目前發(fā)現(xiàn)的光催化活性較高的一種半導體層狀金屬化合物,因其具有獨特的層狀結(jié)構(gòu)、層板溶脹剝離、層間離子交換等特性,成為很多學者研究的熱門材料,并且應(yīng)用廣泛。本論文設(shè)計合成了一系列如石墨烯負載、半導體耦合等K_2Ti4O_9復(fù)合物,并研究了其可見光催化性能。(1)N-K_2Ti_4O_9/G(石墨烯)復(fù)合材料的制備及光催化性能研究。以尿素為氮源,通過焙燒的方法在K_2Ti_4O_9的層間引入N元素,以石墨烯為載體,通過水熱處理最后得到N-K_2Ti4O_9/G復(fù)合材料。結(jié)果表明,石墨烯負載氮摻雜的四鈦酸鉀孔徑變大并且具有更大的比表面積,降解亞甲基藍和羅丹明B具有較高的可見光催化活性。(2)Ag_3PO_4-TiO_2/K_2Ti_4O_9復(fù)合材料的制備及光催化性能研究。以鈦酸異丙酯為鈦源通過焙燒的方法得到TiO_2/K_2Ti_4O_9復(fù)合材料,然后通過一步沉淀法得到Ag_3PO_4-TiO_2/K_2Ti4O_9復(fù)合催化劑,通過XRD、XPS、FT-IR、TEM等手段對該復(fù)合材料進行表征,結(jié)果表明TiO_2包裹在K_2Ti_4O_9的表面,并且TiO_2和Ag_3PO_4的粒徑分別為20 nm和3 nm左右。實驗結(jié)果表明當AgNO_3和TiO_2/K_2Ti_4O_9的投料比為2:1時該復(fù)合催化劑活性最高,在可見光下光照該催化劑對亞甲基藍(MB)、羅丹明B(RhB)和甲基橙(MO)均具有較好的降解性能。(3)Ag_3PO_4/H_2Ti_4O_9納米片的制備及其光催化性能研究。首先,通過將層狀H_2Ti_4O_9在四丁基氫氧化銨溶液中先剝離,然后通過負載Ag3P04將剝離后的納米片重組,最后得到了H_2Ti_4O_9納米片負載不同含量的Ag3P04納米粒子,采用XRD、XPS、FT-IR、TEM等表征手段對復(fù)合材料進行了測試,結(jié)果該復(fù)合催化劑在可見光照射下對亞甲基藍(MB)和羅丹明(RhB)均具有較好的催化降解效率,并且該復(fù)合催化劑有較高催化活性主要歸因于剝離后的納米片具有更大的比表面積和小粒徑、高分散的Ag_3PO_4納米粒子與H_2Ti_4O_9納米片之間顯著的協(xié)同效應(yīng)。
[Abstract]:In recent years, with the theme of sustainable development, global environmental problems have received more and more attention. The heterogeneous photocatalytic reaction with semiconductor materials as catalyst has many unique properties, such as room temperature reaction, deep mineralization purification, direct use of solar light as light source to activate catalyst and drive redox reaction, etc. And has become an ideal environmental pollution control technology. As a kind of semiconductor layered metal compound with high photocatalytic activity found at present, the layered K2Ti4O stack is a kind of semiconductor layered metal compound. Because of its unique layered structure, swelling and stripping of laminates, and ion exchange between layers, it has become a hot material studied by many scholars. And widely used. In this thesis, a series of Ks _ 2Ti _ 4O _ 9 composites, such as graphene supported and semiconductor coupling, have been designed and synthesized, and their visible photocatalytic properties have been studied. N-K2Ti4O9 / G composites were obtained by hydrothermal treatment with urea as nitrogen source and N element as N element in the layer of K2Ti4O\ +\ {9\}\ +\ {9\}\ +\ {9\}\ +\ {}\} _ (9)\%\ +\ { The results show that the graphene supported nitrogen doped potassium tetratitanate has larger pore size and larger specific surface area. The degradation of methylene blue and Rhodamine B have higher visible photocatalytic activity. The preparation and photocatalytic properties of the composite are investigated. Tio _ s _ 2K _ 2Ti _ 4O _ 9 composite was obtained by calcination with isopropyl titanate as titanium source, and then it was characterized by the one-step precipitation method to obtain Ag3PO _ 4-TiO _ 4O _ 9 composite catalyst by means of XRDX / XPS-FT-IRTEM. The results showed that TiO2 was wrapped on the surface of K2Ti4O9. The particle sizes of TiO2 and AgS3PO4 are about 20 nm and 3 nm, respectively. The results show that the composite catalyst has the highest activity when the feed ratio of Agno _ 3 and Tio _ 2 / Ks _ 2TiO _ s _ 9 is 2:1, Under visible light, the catalyst has better degradation performance for methylene blue MBO, Rhodamine Bhh RhB and methyl orange moths. The preparation and photocatalytic properties of the catalyst are studied. First, by stripping the layered H2Ti4O9 in the Ding Ji ammonium hydroxide solution, then by loading the Ag3P04 to recombine the stripped nanoparticles, finally, we get the H2Ti4OS9 nanoparticles loaded with different contents of Ag3P04 nanoparticles. The composite materials were characterized by XRDX XPS FT-IR TEM. The results showed that the composite catalyst had better catalytic degradation efficiency for methylene blue MBB and Rhodamine Rh B) under visible light irradiation. The higher catalytic activity of the composite catalyst is mainly attributed to the larger specific surface area and smaller particle size of the peeled nanoparticles, and the remarkable synergistic effect between the highly dispersed AgSn3PO4 nanoparticles and the H2TiSP-4O9 nanoparticles.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36;O644.1

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相關(guān)期刊論文 前1條

1 荊濤;戴瑛;馬曉娟;黃柏標;;拓展光催化材料光譜響應(yīng)的研究進展[J];中國光學;2016年01期

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