本文選題：二硫化鉬納米片　切入點(diǎn)：磷酸銀　出處：《長(zhǎng)安大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：二硫化鉬(MoS_2)是具有類石墨烯結(jié)構(gòu)的二維(2D)層狀材料,屬于過渡金屬硫化物MX2范疇,其中M和X分別對(duì)應(yīng)于過渡金屬和硫?qū)僭�。它們之間以共價(jià)鍵的方式結(jié)合,各分子層之間存在范德華力。因其特殊的層狀結(jié)構(gòu),在催化、電學(xué)、光學(xué)等領(lǐng)域表現(xiàn)出不同于塊體材料的優(yōu)異性能,引起了研究人員的關(guān)注。本文針對(duì)類石墨烯結(jié)構(gòu)MoS_2納米片的制備以及其催化性能進(jìn)行了研究。以商業(yè)MoS_2為原料,采用低能球磨和超聲聯(lián)用的方法,成功剝離出MoS_2納米片。通過XRD、SEM、HRTEM和AFM等一系列表征方法,對(duì)其晶體結(jié)構(gòu)和形貌進(jìn)行了分析,并討論了不同制備工藝參數(shù)對(duì)實(shí)驗(yàn)結(jié)果的影響。結(jié)果表明:通過上述方法制備的MoS_2納米片厚度為1-3層,且形貌均一,穩(wěn)定性好。其最佳制備條件為:以NMP為溶劑,球磨時(shí)間為24 h,超聲時(shí)間為6 h。采用球磨法制備了Ag_3PO_4/MoS_2納米片復(fù)合催化劑,并對(duì)制備的樣品的結(jié)構(gòu)和相關(guān)性能進(jìn)行了測(cè)試分析。結(jié)果顯示:以亞甲基藍(lán)作為污染物,在可見光照射25 min后,Ag_3PO_4/MoS_2納米片復(fù)合材料對(duì)其降解率最高可達(dá)到93%,而純Ag3PO4對(duì)其降解率僅為80.55%。由重復(fù)試驗(yàn)可知,MoS_2納米片的加入有效改善了Ag3PO4的穩(wěn)定性。采用高溫?zé)峤馊矍璋分频胓-C_3N_4粉體,通過球磨法將g-C_3N_4與MoS_2納米片成功復(fù)合。通過對(duì)樣品的結(jié)構(gòu)和光催化性能表征后得知,g-C_3N_4和MoS_2納米片形成異質(zhì)結(jié)構(gòu),有效提高了g-C_3N_4的光催化性能。其中,以羅丹明B作為污染物,在可見光照射120 min后,MoS_2納米片的摻量為g-C_3N_4質(zhì)量的2%的樣品對(duì)其降解率最高,降解率為97%。同時(shí),光生空穴在該光催化反應(yīng)過程中起主要作用。通過球磨法制備了g-C_3N_4/MoS_2納米片/GO三元復(fù)合材料,并對(duì)其結(jié)構(gòu)和相關(guān)性能進(jìn)行了測(cè)試分析。加入MoS_2納米片和GO后,使得g-C_3N_4的顆粒尺寸減小,塊層變薄。同時(shí),GO作為載體,為g-C_3N_4/MoS_2納米片異質(zhì)結(jié)構(gòu)提供更多光子能量和光催化反應(yīng)活性位點(diǎn),從而提高了g-C_3N_4的光催化性能。相比于單一的MoS_2納米片和GO,兩者的協(xié)同作用能更顯著的改善g-C_3N_4的光催化性能。其中,80/20MG樣品在可見光下降解Rhb的速率分別是g-C_3N_4、0.3%MN和0.3%NG的2.9倍、1.7倍和1.6倍。
[Abstract]:Molybdenum disulfide (MoS _ 2) is a two-dimensional (2-D) layered material with graphene like structure, which belongs to the MX2 category of transition metal sulphides, in which M and X correspond to transition metals and sulfur elements, respectively. There is van der Waals force between the molecular layers. Due to its special layered structure, it exhibits excellent properties different from bulk materials in the fields of catalysis, electricity, optics, etc. In this paper, the preparation and catalytic performance of graphene like MoS_2 nanoparticles were studied. Commercial MoS_2 was used as raw material, and the method of low energy ball milling combined with ultrasonic was used. The MoS_2 nanocrystals were successfully stripped. The crystal structure and morphology were analyzed by means of a series of characterization methods, such as XRD-SEMTEM and AFM. The effects of different preparation parameters on the experimental results were also discussed. The results showed that the MoS_2 nanoparticles prepared by the above method had a thickness of 1-3 layers, uniform morphology and good stability. The optimum preparation conditions were as follows: NMP as solvent. The ball milling time was 24 h and the ultrasonic time was 6 h. The composite catalyst of Ag_3PO_4/MoS_2 nanoparticles was prepared by ball milling method. The structure and related properties of the prepared samples were tested and analyzed. The results showed that methylene blue was used as pollutant. After 25 min of visible light irradiation, the degradation rate of Ag-S _ 3PO _ 4 / MoS _ 2 nanochip composite can reach 93%, but the degradation rate of pure Ag3PO4 is only 80.55%. The repeated experiments show that the addition of MoS _ 2 nanoparticles can effectively improve the stability of Ag3PO4, and the stability of Ag3PO4 is improved by pyrolysis at high temperature. G-C_3N_4 powder prepared from melamine, The structure and photocatalytic properties of g-C_3N_4 and MoS_2 nanoparticles were characterized by ball milling method. It was found that the structure and photocatalytic properties of g-C_3N_4 and MoS_2 nanoparticles were heterogeneous, which effectively improved the photocatalytic performance of g-C_3N_4. Among them, Rhodamine B was used as a pollutant. After 120 min of visible light irradiation, the sample containing 2% of the mass of g-C_3N_4 has the highest degradation rate, and the degradation rate is 97.At the same time, The photogenerated holes play an important role in the photocatalytic reaction. The g-C_3N_4/MoS_2 nanochip / go ternary composites were prepared by ball milling, and their structures and properties were tested and analyzed. The particle size of g-C_3N_4 is reduced and the block layer is thinned. At the same time, go is used as the carrier to provide more photon energy and active sites for photocatalytic reaction for g-C_3N_4/MoS_2 nanocrystalline heterostructures. As a result, the photocatalytic activity of g-C_3N_4 was improved. The synergistic effect of the two can improve the photocatalytic performance of g-C_3N_4 more significantly than that of single MoS_2 and GO.The degradation rate of Rhb in 80 / 20MG sample is g-C3Ns 40.3MN and 0.3%NG under visible light, respectively. 2.9-fold, 1.7-fold and 1.6-fold.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB383.1;TQ136.12

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