本文選題：石墨相氮化碳 + 光催化��； 參考：《內(nèi)蒙古民族大學(xué)》2015年碩士論文

【摘要】：石墨相氮化碳(g-C3N4)以其具有環(huán)境友好、組成元素含量豐富、制備簡(jiǎn)單、原料廉價(jià)和可規(guī)模化制備等優(yōu)勢(shì),成為當(dāng)今可見光半導(dǎo)體材料研究的重點(diǎn),但g-C3N4的結(jié)構(gòu)特點(diǎn)導(dǎo)致其光電流響應(yīng)偏低,其光催化降解有機(jī)污染物和光催化分解水制氫反應(yīng)的效率不高。通過自組裝的方式在g-C3N4表面修飾具有反應(yīng)活性的化合物或活性基團(tuán)實(shí)現(xiàn)g-C3N4的表面功能化,是提高其光催化和化學(xué)催化活性的重要途徑之一。本論文探索了g-C3N4的表面修飾及功能化新途徑,對(duì)于將g-C3N4應(yīng)用于降解印染廢水方面具有實(shí)際意義。主要研究工作包括:鐵-磷鎢酸配合物(Fe-PW)依靠非共價(jià)的超分子作用力作用在g-C3N4表面對(duì)其進(jìn)行功能化,修飾后g-C3N4的光催化效率和循環(huán)穩(wěn)定性明顯提高。在模擬太陽光條件下,Fe-PW/g-C3N4催化劑對(duì)100 mL 10 mg/L羅丹明B(RhB)的光降解效率是純g-C3N4的1.75倍,并且經(jīng)過5次循環(huán)之后,仍可以在25分鐘之內(nèi),將RhB降解完全;太陽光條件下,Fe-PW/g-C3N4催化劑在15分鐘內(nèi)對(duì)100 mL 10mg/L甲基橙(MO)的降解率達(dá)到100%,而純g-C3N4體系在30分鐘內(nèi)對(duì)相同體系MO的降解率僅為50%。經(jīng)過4次循環(huán)之后,25分鐘時(shí)MO的降解率為100%,在太陽光或模擬太陽光條件下,Fe-PW/g-C3N4超分子雜化催化劑對(duì)RhB和MO的降解活性都有顯著提升,同時(shí)又保持了良好的循環(huán)穩(wěn)定性。通過二茂鐵摀離子、Fe(III)-羧酸配合物自組裝在g-C3N4表面,并通過光催化反應(yīng)考察其修飾效果。模擬太陽光下,二茂鐵摀離子/g-C3N4超分子雜化催化劑降解MO(10 mg/L)的光催化效率是g-C3N4的1.67倍。模擬可見光下,Fe(III)-Cit/g-C3N4、Fe(III)-C2O4/g-C3N4超分子雜化催化劑對(duì)RhB(10 mg/L)的光催化效率較純g-C3N4均提高了1.1倍。這表明,二茂鐵摀離子、Fe(III)-羧酸配合物非共價(jià)修飾g-C3N4,可以實(shí)現(xiàn)g-C3N4的表面功能化,反應(yīng)位點(diǎn)增加、光催化活性及循環(huán)穩(wěn)定性提高。通過改變升溫速率制備出了不同聚合度的g-C3N4,探索了在不同聚合度下g-C3N4光催化分解水制氫能力的變化。實(shí)驗(yàn)結(jié)果表明,在模擬太陽光下,TEOA為犧牲劑,負(fù)載貴金屬Pt時(shí),g-C3N4的聚合越大,其產(chǎn)氫能力越強(qiáng)。
[Abstract]:Graphite phase carbon nitride (g-C _ 3N _ 4) has become the focus of research on visible light semiconductor materials due to its advantages of environmental friendliness, abundant element content, simple preparation, cheap raw materials and large scale preparation. However, the photocurrent response of g-C _ 3N _ 4 is low due to its structural characteristics, and the efficiency of photocatalytic degradation of organic pollutants and photocatalytic decomposition of water to produce hydrogen is not high. The surface functionalization of g-C _ 3N _ 4 by self-assembly on the surface of g-C _ 3N _ 4 is one of the important ways to improve its photocatalytic and chemical catalytic activity. In this paper, a new way of surface modification and functionalization of g-C _ 3N _ 4 is explored, which is of practical significance for the application of g-C _ 3N _ 4 to the degradation of dyeing wastewater. The main research work includes: Fe-PW complexes are functionalized on the surface of g-C _ 3N _ 4 by non-covalent supramolecular forces. The photocatalytic efficiency and cyclic stability of g-C _ 3N _ 4 are improved obviously after modification. The photodegradation efficiency of 100 mL 10mg / L Rhodamine B (RhB) catalyzed by Fe-PW-g-C3N4 catalyst under simulated solar light is 1.75 times that of pure g-C3N4. After 5 cycles, RhB can be completely degraded within 25 minutes. The degradation rate of 100 mL 10mg / L methyl orange (MO) by Fe-PW-g-C3N4 catalyst in 15 minutes was 100%, while that of pure g-C3N4 system was only 50% in 30 minutes. After four cycles for 25 minutes, the degradation rate of MO was 100. The catalytic activity of Fe-PW-g-C3N4 supramolecular hybrid catalysts for RhB and MO was significantly improved under the conditions of solar or simulated sunlight, and the degradation activity of RhB and MO was improved significantly, at the same time, good cycling stability was maintained. The Fe (III) -carboxylic acid complex was self-assembled on the surface of g-C _ 3N _ 4 and its modification effect was investigated by photocatalytic reaction. Under simulated sunlight, the photocatalytic efficiency of ferrocene-mg-C3N4 supramolecular hybrid catalyst for the degradation of MO (10 mg / L) was 1.67 times higher than that of g-C3N4. The photocatalytic efficiency of Fe (III) -Citg-C _ 3N _ 4 Fe (III) C _ 2O _ 4 / g-C _ 3N _ 4 supramolecular hybrid catalyst for RhB (10 mg / L) was 1.1 times higher than that of pure g-C _ 3N _ 4. The results show that the noncovalent modification of g-C _ 3N _ 4 with ferrocene-containing Fe (III) -carboxylic acid complex can result in the surface functionalization of g-C _ 3N _ 4, the increase of reaction sites, and the improvement of photocatalytic activity and cycle stability of g-C _ 3N _ 4. G-C _ 3N _ 4 with different degree of polymerization was prepared by changing the heating rate, and the change of photocatalytic ability of g-C _ 3N _ 4 to produce hydrogen from water was explored under different degrees of polymerization. The experimental results show that the larger the polymerization of the noble metal Pt is, the stronger the hydrogen production capacity is when TEOA is used as a sacrificial agent under simulated solar light.
【學(xué)位授予單位】：內(nèi)蒙古民族大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ116.2;O643.36

【參考文獻(xiàn)】

相關(guān)期刊論文 前1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(jìn)展;2014年01期

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本文編號(hào)：2117053