本文選題：TiO_2異質(zhì)結 + 還原處理�。� 參考：《南昌航空大學》2017年碩士論文

【摘要】：隨著世界人口的急劇增長、經(jīng)濟的突飛猛進、社會的快速進步,人類對賴以生存的環(huán)境和日常生活質(zhì)量的要求也越來越高。與此同時,工業(yè)廢水、農(nóng)業(yè)污水、生活污水以及生活垃圾、大氣污染等,不僅影響著我們的身心健康,更是威脅著子孫后代。光催化是近些年來比較熱門的研究課題,其中TiO_2是一種二元過渡金屬氧化物,具有無毒、化學性能穩(wěn)定、合成方法簡單等優(yōu)點,但是也有不可避免的缺點,即一個寬的光禁帶導致對太陽光的使用受到限制。本論文成功制備出銳鈦礦/金紅石異質(zhì)結材料(Ti AR),銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB)和介孔硫化鎘/二氧化鈦異質(zhì)結材料(Cd S/TiO_2),并研究了H_2還原過程和H_2O_2氧化過程對銳鈦礦/金紅石異質(zhì)結材料(Ti AR)和銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB)表面性質(zhì)的影響及表面化學與光催化性能之間的關系,同時探討了TiO_2摻雜硫化鎘的最佳比例。此外,通過SEM、BET、TEM、XRD、Raman、Uv-Vis、XPS、EPR和Zeta電位對材料的晶型、質(zhì)構特性、微觀形態(tài)、晶格結構及材料表面化學狀態(tài)進行表征,并通過光催化降解實驗和光電流實驗對材料的光催化性能做出了評估。具體研究內(nèi)容如下:(1)采用水熱法制備銳鈦礦/金紅石異質(zhì)結材料(Ti AR),并分別將銳鈦礦/金紅石異質(zhì)結材料(Ti AR)在H_2中煅燒進行還原處理,在H_2O_2水溶液中反應進行氧化處理,來研究還原處理和氧化處理對銳鈦礦/金紅石異質(zhì)結(Ti AR)性能的影響。結果表明,銳鈦礦/金紅石異質(zhì)結(Ti AR)由納米粒子(銳鈦礦)和納米磚(金紅石)組成,且納米粒子生長在納米磚的表面。無論是H_2還原處理還是H_2O_2氧化處理,銳鈦礦/金紅石異質(zhì)結材料(Ti AR)都會保持原來的形貌、晶相與粒徑,只是晶相比例和帶隙發(fā)生了略微的變化。在降解甲基橙(MO)實驗過程中,H_2處理過的Ti AR異質(zhì)結材料活性有所下降。相反地,H_2O_2氧化的Ti AR的活性卻高于未經(jīng)處理的Ti AR,其中,經(jīng)過160°C處理的Ti AR(H_2O_2)的活性最高。(2)采用水熱法制備銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB),并分別將銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB)在H_2中煅燒進行還原處理,在H_2O_2水溶液中反應進行氧化處理,來研究還原處理和氧化處理對銳鈦礦/板鈦礦異質(zhì)結(Ti AB)性能的影響。結果表明,銳鈦礦/板鈦礦異質(zhì)結(Ti AB)由納米粒子(銳鈦礦)和納米棒(板鈦礦)組成,且納米棒占主導地位。無論是H_2還原處理還是H_2O_2氧化處理,銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB)都會保持原來的形貌、晶相與粒徑,只是晶相比例和帶隙發(fā)生了略微的變化。在降解甲基橙(MO)實驗過程中,未經(jīng)處理的銳鈦礦/板鈦礦異質(zhì)結材料(Ti AB)由于表面的Ti~(3+)和氧空位可以提高電荷分離,因此表現(xiàn)出的活性最高。還原處理和氧化處理均會使導致Ti AB的活性下降,Ti AB(H_2O_2)活性的降低程度還取決于不同的反應溫度。(3)采用溶膠-凝膠法制備介孔TiO_2和一系列不同摩爾比的介孔硫化鎘/二氧化鈦異質(zhì)結材料(Cd S/TiO_2),通過調(diào)節(jié)Cd S的摻入比例來增強TiO_2的光催化能力。結果表明,當Cd S與TiO_2的摩爾比為0.12時,異質(zhì)結材料的UV-vis光譜有較明顯的紅移現(xiàn)象,光催化性能優(yōu)于純介孔TiO_2和純Cd S,且具有較高的穩(wěn)定性,五次循環(huán)降解甲基橙溶液之后活性和穩(wěn)定性仍然很好。這說明當Cd S與TiO_2的摩爾比例為0.12時,負載的Cd S含量最適宜于阻礙電子和空穴的復合,進而改善Cd S/TiO_2復合材料的光催化性能。此外,對于亞甲基藍、雙酚A(BPA)、羅丹明B和孔雀石綠的降解進一步表明了Cd S與TiO_2的摩爾比為0.12時,光催化劑的性能最顯著。
[Abstract]:With the rapid growth of the world population, the rapid progress of the economy and the rapid progress of society, the demands for the living environment and the quality of daily life are becoming higher and higher. At the same time, industrial waste water, agricultural sewage, domestic sewage and domestic waste, air pollution and so on, not only affect our physical and mental health, but also threaten our children and grandchildren. Photo catalysis is a hot research topic in recent years. TiO_2 is a kind of two element transition metal oxide, which has the advantages of non-toxic, stable chemical properties, simple synthesis method, but also has the inevitable shortcoming, that is, a wide light band leads to the use of the sun light. This paper has successfully prepared anatase / anatase. Rutile heterojunction material (Ti AR), anatase / plate titanium heterojunction material (Ti AB) and mesoporous cadmium / titanium dioxide heterojunction (Cd S/TiO_2), and the influence of the H_2 reduction process and H_2O_2 oxidation on the surface properties of anatase / rutile heterojunction materials (Ti AR) and anatase / plate titanate heterojunction materials (Ti AB) are studied. The relationship between chemical and photocatalytic properties, and the optimum proportion of TiO_2 doped cadmium sulfide. In addition, the crystal, texture, microstructure, lattice structure and surface chemical state of the material are characterized by SEM, BET, TEM, XRD, Raman, Uv-Vis, XPS, EPR and Zeta potentials, and through photocatalytic degradation experiments and photocurrent experiments. The photocatalytic properties of the materials were evaluated. The specific contents were as follows: (1) anatase / rutile heterojunction materials (Ti AR) were prepared by hydrothermal method, and the anatase / rutile heterojunction material (Ti AR) was calcined in H_2, and the reaction was oxidized in the solution of H_2O_2 water to study the reduction treatment and oxidation. The effects on the performance of anatase / Jin Hongshi heterojunction (Ti AR) were treated. The results showed that anatase / Jin Hongshi heterojunction (Ti AR) was composed of nanoparticles (anatase) and nano brick (Jin Hongshi), and nanoparticles were grown on the surface of nano brick. The H_2 reduction treatment was also oxidized by H_2O_2, anatase / Jin Hongshi heterojunction (Ti AR). In the process of degradation of methyl orange (MO), the activity of Ti AR heterojunction materials treated by H_2 decreased. On the contrary, the activity of H_2O_2 oxidized Ti AR was higher than that of Ti AR, which was treated by 160 degree C. (2) anatase / plate titanium heterojunction material (Ti AB) was prepared by hydrothermal method, and anatase / plate titanium heterojunction material (Ti AB) was calcined in H_2, and the oxidation treatment was carried out in H_2O_2 water solution to study the properties of anatase / plate titanium heterojunction (Ti AB) by reduction treatment and oxidation treatment. The results show that the anatase / plate titanium heterojunction (Ti AB) is composed of nanoparticles (anatase) and nanorods (plate titanium), and nanorods dominate. Both H_2 reduction and H_2O_2 oxidation treatment, anatase / plate titanium heterojunction material (Ti AB) will maintain the original morphology, crystal phase and particle size, only the proportion and band of crystalline phase. In the process of degradation of methyl orange (MO), untreated anatase / plate titanium heterojunction material (Ti AB) can increase the charge separation due to the surface Ti~ (3+) and oxygen vacancy, so the activity of the reduction treatment and oxidation can lead to the decrease of the activity of Ti AB and the Ti AB (H_2O_2) activity. The degree of reduction also depends on the different reaction temperatures. (3) the mesoporous TiO_2 and a series of mesoporous cadmium sulfide / titanium dioxide heterojunction materials (Cd S/TiO_2) are prepared by the sol-gel method, and the photocatalytic ability of TiO_2 is enhanced by adjusting the proportion of Cd S. The results show that when the molar ratio of Cd S to TiO_2 is 0.12, the heterostructure is different. The UV-vis spectra of the materials have obvious red shift. The photocatalytic performance is better than pure mesoporous TiO_2 and pure Cd S, and has high stability. After five cycles of degradation of methyl orange solution, the activity and stability are still good. This shows that when the molar ratio of Cd S to TiO_2 is 0.12, the Cd S content of negative load is most suitable for blocking electrons and holes. In addition, the photocatalytic properties of Cd S/TiO_2 composites were improved. In addition, the degradation of methylene blue, bisphenol A (BPA), Luo Danming B and peacock green showed that the photocatalyst performance was the most significant when the molar ratio of Cd S to TiO_2 was 0.12.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36

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