本文選題：光催化降解 + 微觀形貌調(diào)控��； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：光催化降解有機(jī)污染物作為一種高級(jí)氧化技術(shù),在環(huán)境污染物治理和控制領(lǐng)域內(nèi)發(fā)揮著重要作用。In2O3作為光催化材料,具有光響應(yīng)能力強(qiáng)、化學(xué)穩(wěn)定性強(qiáng)、熱穩(wěn)定性強(qiáng)和容易合成各種微觀形貌等優(yōu)點(diǎn),在光催化降解有機(jī)污染物方面具有很高的應(yīng)用價(jià)值。然而,In2O3作為光催化材料也有兩個(gè)顯著的缺點(diǎn)：一是由于In2O3材料本身的禁帶寬度較大,只對(duì)紫外光有較好的吸收能力,而對(duì)在太陽(yáng)光中占很大比重的可見光幾乎沒有吸收能力,不能充分利用太陽(yáng)光的光能；二是In2O3材料所產(chǎn)生的光生空穴-電子對(duì)容易發(fā)生復(fù)合,降低了材料的光降解效率。上述兩個(gè)問題的存在,限制了In2O3材料的光催化性能。本論文通過對(duì)In2O3光催化材料進(jìn)行微觀形貌調(diào)控和晶型調(diào)控,使In2O3材料的光催化性能得到提高。主要研究成果如下：(1)利用溶劑熱法制備出無形態(tài)納米顆粒、微米球和空心微米球三種不同微觀形貌的bcc-In2O3光催化材料,實(shí)現(xiàn)了對(duì)In2O3光催化材料的微觀形貌調(diào)控。然后,對(duì)所制備的不同微觀形貌樣品進(jìn)行XRD、SEM、TEM、DRS和氮?dú)馕?脫附表征分析。結(jié)果表明空心微米球樣品的微觀形貌為典型的空心薄殼結(jié)構(gòu),光吸收邊界達(dá)到480 nn3,孔徑分布集中在2～10 nm,比表面積達(dá)到73.8m2/g,具有較強(qiáng)的光催化性能。同時(shí),以氣態(tài)甲苯為目標(biāo)降解物,考察了所制備的不同微觀形貌樣品的光催化降解性能。結(jié)果表明空心微米球樣品在5 h降解率就已達(dá)到97.21%。此外,對(duì)樣品進(jìn)行了ESR表征測(cè)試,結(jié)果表明空心微米球樣品能夠產(chǎn)生更多的活性自由基。(2)利用溶劑熱法成功制備出bcc-/rh-In2O3混晶納米催化材料以及bcc-In2O3和rh-In2O3兩種單晶納米催化材料,并能通過適當(dāng)?shù)乜刂品磻?yīng)時(shí)間合成出不同比例的bcc-/rh-In2O3混晶納米催化材料,實(shí)現(xiàn)了對(duì)In2O3納米催化材料的晶型調(diào)控。然后對(duì)所制備的樣品進(jìn)行了XRD、SEM、TEM、HRTEM和DRS表征分析。結(jié)果表明bcc-/rh-In2O3混晶樣品的微觀形貌為“楊梅狀”球體,各個(gè)晶型的晶面相互重疊和交錯(cuò),有異相結(jié)形成,對(duì)可見光的吸收能力為單晶樣品的10倍。同時(shí),以氣態(tài)甲苯為目標(biāo)降解物,考察了所制備的不同晶型In2O3樣品的光催化降解性能。結(jié)果表明bcc-/rh-In2O3混晶樣品在反應(yīng)進(jìn)行到5h時(shí)的降解率達(dá)到97.65%。
[Abstract]:Photocatalytic degradation of organic pollutants, as an advanced oxidation technology, plays an important role in the field of environmental pollutant treatment and control. The advantages of high thermal stability and easy to synthesize all kinds of micro-morphology have high application value in photocatalytic degradation of organic pollutants. However, as a photocatalytic material, in _ 2O _ 3 also has two obvious disadvantages: first, because of the wide band gap of In2O3 material itself, it only has a better absorption capacity to ultraviolet light, but it has almost no absorption ability to visible light, which accounts for a large proportion of the solar light. The photo-cavity-electron pair produced by In2O3 materials is easy to be recombined, which reduces the photodegradation efficiency of the materials. The existence of these two problems limits the photocatalytic performance of In2O3 materials. In this paper, the photocatalytic properties of In2O3 photocatalytic materials were improved by controlling the morphology and crystal morphology of In2O3 photocatalytic materials. The main results are as follows: (1) three kinds of bcc-In2O3 photocatalytic materials with different morphologies were prepared by solvothermal method, including amorphous nanoparticles, microspheres and hollow microspheres, which can control the morphology of In2O3 photocatalytic materials. Then, the samples with different micromorphology were analyzed by XRDX SEM Tem DRS and nitrogen adsorption-desorption schedule. The results show that the microstructure of the hollow microspheres is a typical hollow thin shell structure with a light absorption boundary of 480 nm ~ 3, a pore size distribution of 2 ~ 10 nm and a specific surface area of 73.8 m ~ 2 / g. It has strong photocatalytic properties. At the same time, the photocatalytic degradation of gaseous toluene was investigated. The results showed that the degradation rate of hollow microspheres reached 97.21 in 5 h. In addition, the samples were characterized by ESR. The results show that the hollow micron spheres can produce more active free radicals.) bcc-/rh-In2O3 mixed nanocrystalline nanocatalysts and bcc-In2O3 and rh-In2O3 nanocrystalline catalytic materials were successfully prepared by solvothermal method. Different proportions of bcc-/rh-In2O3 mixed nanocrystalline catalyst materials can be synthesized by properly controlling the reaction time, and the crystal shape of In2O3 nanocrystalline catalyst materials can be controlled. The samples were characterized by TEM and DRS. The results show that the microcosmic morphology of the bcc-/rh-In2O3 mixed crystal sample is "bayberry" sphere, the crystal planes of each crystal form overlap and intersect, and there are heterogeneous junctions, and the absorption ability to visible light is 10 times of that of the single crystal sample. At the same time, the photocatalytic degradation of different crystalline In2O3 samples was investigated with gaseous toluene as the target degradation material. The results showed that the degradation rate of bcc-/rh-In2O3 mixed crystal samples reached 97.65 when the reaction lasted for 5 h.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X701;O643.36
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本文編號(hào)：1814090