本文選題：生物污損　切入點(diǎn)：BiOI　出處：《中國(guó)科學(xué)院大學(xué)(中國(guó)科學(xué)院海洋研究所)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：海洋生物污損影響海洋工程材料的正常服役,是人類開發(fā)利用海洋難以回避的問(wèn)題。因此,研發(fā)新型、高效、環(huán)保防污材料具有重要的現(xiàn)實(shí)意義。光催化防污技術(shù)以其低能耗、環(huán)境友好等優(yōu)點(diǎn)受到越來(lái)越多的關(guān)注。為克服傳統(tǒng)光催化材料(如TiO_2)對(duì)太陽(yáng)能利用效率低以及光催化粉體材料回收難等缺點(diǎn),本論文以BiOI可見光催化半導(dǎo)體材料為研究對(duì)象,發(fā)展了在常溫常壓下具有納米分級(jí)結(jié)構(gòu)四方相BiOI單體材料的簡(jiǎn)易制備方法。在此基礎(chǔ)上采用原位生長(zhǎng)技術(shù)實(shí)現(xiàn)了BiOI在金屬基體上的薄膜化,并進(jìn)一步采用離子交換法將BiOI單體薄膜加以改性制得BiOI/BiOBr二元半導(dǎo)體復(fù)合薄膜材料。具體研內(nèi)容如下:(1)通過(guò)控制共沉淀反應(yīng)條件,在常溫常壓不添加表面活性劑的條件下實(shí)現(xiàn)了具有花球狀分級(jí)結(jié)構(gòu)BiOI單體納米材料的可控合成。在可見光激發(fā)下,實(shí)現(xiàn)了對(duì)污損細(xì)菌的高效殺滅。殺菌機(jī)理研究表明:h+和·O_2-自由基的產(chǎn)生致使細(xì)菌細(xì)胞壁膜的破壞是BiOI在水體環(huán)境中保持高效光催化殺菌性能的根本原因。(2)利用無(wú)機(jī)晶體原位生長(zhǎng)技術(shù),首次實(shí)現(xiàn)了在金屬基體(304SS)表面構(gòu)建具有良好光催化活性的BiOI薄膜。優(yōu)化各制備工藝參數(shù)后,在140 ℃,PVP為0.10 g,反應(yīng)時(shí)間為4 h條件下,制備了物理結(jié)構(gòu)及光化學(xué)性質(zhì)穩(wěn)定性最佳的BiOI薄膜材料。薄膜呈納米分級(jí)結(jié)構(gòu),均勻覆蓋于金屬基體表面,其光催化活性與BiOI粉體材料相比無(wú)明顯下降。對(duì)海洋污損模式細(xì)菌及污損藻類顯示出良好的光催化殺滅及防附著性能。(3)以四丁基溴化銨(TBAB)為溴源,采用離子交換方法,在304SS基體表面成功構(gòu)筑了具有p-n異質(zhì)結(jié)結(jié)構(gòu)的BiOI/BiOBr二元復(fù)合半導(dǎo)體薄膜材料,與BiOI單體薄膜材料相比其光催化活性明顯提高。此外,研究證實(shí)了其對(duì)細(xì)菌胞質(zhì)內(nèi)遺傳物質(zhì)(環(huán)狀質(zhì)粒DNA)具有光催化開環(huán)破壞作用,進(jìn)一步豐富了光催化材料的殺菌防污機(jī)理。
[Abstract]:Marine fouling affects the normal service of marine engineering materials, which is an unavoidable problem for human exploitation and utilization of the ocean. Therefore, it is of great practical significance to develop new, efficient and environmentally friendly antifouling materials. Photocatalytic antifouling technology has its low energy consumption. Environmental friendliness has attracted more and more attention. In order to overcome the disadvantages of traditional photocatalytic materials (such as TiO-2), such as low efficiency of solar energy utilization and difficulty in recovering photocatalytic powder materials, this paper focuses on BiOI visible light catalyzed semiconductor materials. A simple preparation method of tetragonal BiOI monomers with nanometer graded structure at room temperature and atmospheric pressure was developed. On the basis of this, the thin films of BiOI on metal substrates were realized by in situ growth technique. Furthermore, the BiOI monomers were modified by ion exchange method to prepare BiOI/BiOBr binary semiconductor composite films. The specific contents are as follows: 1) by controlling the coprecipitation reaction conditions, The controllable synthesis of BiOI monomeric nanomaterials with flower-like graded structure has been realized under the condition of normal temperature and atmospheric pressure without the addition of surfactants. The bactericidal mechanism shows that the destruction of cell wall membrane caused by the generation of% h and 路O 2- free radicals is the fundamental reason why BiOI maintains high efficiency photocatalytic bactericidal activity in water environment. In situ growth technology of mechanical crystals, The BiOI thin films with good photocatalytic activity on the surface of metal substrate 304SS were fabricated for the first time. After optimizing the preparation process parameters, under the conditions of 0.10 g at 140 鈩，

本文編號(hào)：1612057