本文選題：氮化碳 + 鉬酸鉍��； 參考：《常州大學(xué)》2017年碩士論文

【摘要】：近年來,光催化技術(shù)在有機污染物修復(fù)和清潔能源生產(chǎn)方面吸引了眾多研究者的注意。類石墨相氮化碳(g-C_3N_4)因其高穩(wěn)定性、廉價及特殊的電子能帶結(jié)構(gòu)等特點,被廣泛應(yīng)用于光催化領(lǐng)域。本論文為進一步拓展g-C_3N_4在環(huán)境污染方面的應(yīng)用,制備出三種新型高效穩(wěn)定的復(fù)合催化劑。主要研究內(nèi)容及結(jié)果如下:(1)運用超聲浸漬法制備了不同pH的Bi_2MoO_6/g-C_3N_4復(fù)合催化劑。采用XRD、FT-IR、TEM、BET、UV-vis等手段進行表征,并在可見光下通過降解羅丹明B(RhB)評價材料的光催性能。研究結(jié)果表明Bi_2MoO_6/g-C_3N_4能有效分離光生電子-空穴對從而表現(xiàn)出優(yōu)于單體的光催化效果,且pH值不同也會導(dǎo)致催化劑具有不同的光催化效果。(2)通過熱縮聚法制備了不同含硫量的石墨相氮化碳(g-CNS),并進一步合成硝基鋅酞菁/含硫氮化碳(ZnTNPc/g-CNS)復(fù)合光催化劑。通過XRD、TEM、TG、XPS、EPR等手段表征催化劑的結(jié)構(gòu)、形貌等。研究表明,S的加入使g-C_3N_4形成晶格缺陷促進光生電子-空穴對的分離,同時能夠增大g-C_3N_4的比表面積。通過可見光條件下降解亞甲基藍(lán)(MB)實驗表明,ZnTNPc/g-CNS90呈現(xiàn)出最高的光催化活性且具有良好的穩(wěn)定性。此外,還進一步探究了復(fù)合催化劑降解MB溶液過程中的可能性機理。在此研究基礎(chǔ)上,進一步探究了不同酞菁取代基對光催化性能的影響。制備出鋅酞菁/含硫氮化碳(ZnPc/g-CNS)、硝基鋅酞菁/含硫氮化碳(ZnTNPc/g-CNS)、羧基鋅酞菁/含硫氮化碳(ZnTCPc/g-CNS),并通過XRD、FT-IR、TEM、UV-vis等手段進行表征。在可見光下降解MB實驗表明,取代基酞菁的催化活性優(yōu)于無取代基酞菁,吸電子性強的基團能夠優(yōu)化酞菁的能帶結(jié)構(gòu),更利于光催化反應(yīng)的進行。(3)以SBA-15為模板制備介孔氮化碳(MCN),用原位生長法合成了SnS_2/MCN、CoS_2/MCN以及不同質(zhì)量比的SnCoS_4/MCN復(fù)合催化劑。通過XRD、TEM、UV-vis、EDS、PL等對樣品的結(jié)構(gòu)、形貌、光學(xué)性質(zhì)等進行表征�？梢姽庀陆到釳B實驗結(jié)果表明SnCoS_4/MCN(0.5)光催化性能最好。光催化機理研究發(fā)現(xiàn),·OH、h+和·O2-是降解MB過程中活性物種。
[Abstract]:In recent years, photocatalytic technology has attracted the attention of many researchers in organic pollutant remediation and clean energy production. Graphite-like carbon nitride (C3N4) has been widely used in photocatalysis due to its high stability, low cost and special electronic band structure. In order to further expand the application of g-C_3N_4 in environmental pollution, three new high efficient and stable composite catalysts were prepared in this paper. The main contents and results are as follows: (1) Bi_2MoO_6/g-C_3N_4 composite catalysts with different pH were prepared by ultrasonic impregnation. The photocatalytic properties of the materials were characterized by XRDX FT-IRT-TEMT-BET-UV-vis, and the photocatalytic properties of the materials were evaluated by degradation of Rhodamine Bhh B under visible light. The results show that Bi_2MoO_6/g-C_3N_4 can effectively separate photogenerated electron-hole pairs and thus exhibit a better photocatalytic effect than monomers. Different pH values also lead to different photocatalytic effects. (2) Graphite phase nitrided carbon nitride with different sulfur content was prepared by thermal condensation method, and nitro zinc phthalocyanine / zinc nitride carbon nitride / ZnTNPc / g-CNS composite photocatalyst was further synthesized. The structure and morphology of the catalyst were characterized by means of XRDX, TGG, TGP, EPR and so on. The results show that the lattice defects of g-C_3N_4 can promote the separation of photogenerated electron-hole pairs and increase the specific surface area of g-C_3N_4. The degradation of methylene blue in visible light showed that ZnTNPc / g-CNS90 exhibited the highest photocatalytic activity and had good stability. In addition, the possible mechanism of the degradation of MB solution by the composite catalyst was further explored. On the basis of this study, the effects of different phthalocyanine substituents on photocatalytic properties were further investigated. Zinc phthalocyanine / sulfur-containing carbon nitride ZnPc / g-CNS, nitrozinc phthalocyanine / sulfide-containing carbon nitride ZnTNPc / g-CNS, carboxyl zinc phthalocyanine / sulfur-containing carbon nitride ZnTCPc / g-CNSEU were prepared and characterized by XRDFT-IRTEMUV-vis. The experimental results of MB degradation under visible light showed that the catalytic activity of substituted phthalocyanines was better than that of non-substituted phthalocyanines, and the band structure of phthalocyanines could be optimized by the groups with strong electron absorption. The mesoporous carbon nitride (MCNN) was prepared by using SBA-15 as a template. SNS _ 2 / MCNC _ (2 / C) / CoS-1 / MCN and SnCoS_4/MCN composite catalysts with different mass ratios were synthesized by in-situ growth method. The structure, morphology and optical properties of the samples were characterized by XRDX Tem Tem UV-visN EDSPL and so on. The experimental results of MB degradation under visible light show that SnCoS4 / MCN-0.5) has the best photocatalytic performance. The photocatalytic mechanism shows that OHH and O 2-are active species in the degradation of MB.
【學(xué)位授予單位】：常州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O643.36

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 張金水;王博;王心晨;;氮化碳聚合物半導(dǎo)體光催化[J];化學(xué)進展;2014年01期

2 吳文俊;蔣洪強;;我國工業(yè)廢水重金屬排放的等標(biāo)負(fù)荷特征分析[J];環(huán)境科學(xué)與技術(shù);2012年11期

3 張丹;張學(xué)俊;;金屬酞菁敏化劑的合成及性質(zhì)研究[J];化工中間體;2011年07期

4 楊朝暉;吳敏;秦艷濤;張俊頡;孫岳明;;電化學(xué)沉積四氨基酞菁鎳敏化納米TiO_2電極[J];東南大學(xué)學(xué)報(自然科學(xué)版);2006年02期

5 向能軍,鄧建成;一種新型的可溶性銅酞菁衍生物的合成及其性能研究[J];精細(xì)化工中間體;2001年05期

6 沈偉韌,趙文寬,賀飛,方佑齡;TiO_2光催化反應(yīng)及其在廢水處理中的應(yīng)用[J];化學(xué)進展;1998年04期

7 余遠(yuǎn)斌,楊錦宗;酞菁類催化劑的研究進展[J];北京工業(yè)大學(xué)學(xué)報;1998年02期

相關(guān)碩士學(xué)位論文 前2條

1 孟雅麗;g-C_3N_4的合成及其光催化研究[D];大連理工大學(xué);2011年

2 朱禮;鉬酸鉍復(fù)合氧化物的制備、修飾及其可見光催化性能的研究[D];華南理工大學(xué);2011年

，

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