本文選題：β-FeOOH + H_2�。� 參考：《安徽大學(xué)》2015年碩士論文

【摘要】：β-FeOOH是一種性能優(yōu)良的功能材料,可用作顏料、催化劑、磁記錄介質(zhì)的前驅(qū)體、磁性涂料和氣體傳感器等。同時(shí),β-FeOOH是合成各種磁性材料(如Fe3O4、γ-Fe2O3和Fe等)的良好前驅(qū)體。例如,錄像磁帶中使用的磁性微粒(鐵或γ-Fe2O3)就是β-FeOOH前驅(qū)體在高溫鍛燒后獲得的。該方法獲得的磁性材料性能優(yōu)良且成本低廉,因此,應(yīng)用前景好。然而,β-FeOOH前驅(qū)體的控制合成、還原過(guò)程及其產(chǎn)物轉(zhuǎn)化工藝在當(dāng)前還值得繼續(xù)探究。本文結(jié)合環(huán)境友好與還原的特點(diǎn),側(cè)重開展了 β-FeOOH的改性與制備,并嘗試實(shí)現(xiàn)以β-FeOOH為前驅(qū)體生產(chǎn)各種磁性納米材料；研究了其還原特性與產(chǎn)物轉(zhuǎn)化技術(shù)；探索了各種磁性轉(zhuǎn)化產(chǎn)物可能的機(jī)理等等。本文的主要工作內(nèi)容如下：1.介紹β-FeOOH的研究現(xiàn)狀,對(duì)常用的制備方法、目前的主要研究方向、β-FeOOH與其他鐵系氧化物的關(guān)系、β-FeOOH的主要應(yīng)用與結(jié)構(gòu)特點(diǎn)等方面做了詳細(xì)的介紹,在歸納與總結(jié)的基礎(chǔ)上對(duì)本文的研究?jī)?nèi)容提出可行的方案。2、采用不同合成方法,成功設(shè)計(jì)、制備出了5種形態(tài)的β-FeOOH納米晶；實(shí)現(xiàn)了穩(wěn)定合成多種形態(tài)的β-FeOOH納米材料。對(duì)所得的產(chǎn)物進(jìn)行了XRD、 SEM. TGA等表征,對(duì)比分析它們的差異。3、研究了常壓H2氣氛中,還原溫度為100℃-650℃,實(shí)驗(yàn)制備出的P-FeOOH納米晶的還原過(guò)程,主要包括：脫水(β-FeOOH→Fe2O3)、部分還原(Fe2O3→Fe3O4)和再完全還原(γ-Fe2O3→Fe3O4/Fe)三個(gè)過(guò)程,并在β-FeOOH納米棒的表面實(shí)現(xiàn)了部分還原,得到了部分還原產(chǎn)物多晶的Fe3O4。4、針對(duì)β-FeOOH納米晶氣壓誘導(dǎo)結(jié)構(gòu)轉(zhuǎn)變的可能性,探索了其在硼氫化鈉溶液中70℃條件下的還原過(guò)程及轉(zhuǎn)變可能機(jī)理。發(fā)現(xiàn)在一定溫度下,密閉的水體系中,一定濃度的硼氫化鈉與β-FeOOH納米晶相互作用,β-FeOOH的轉(zhuǎn)變過(guò)程為：β-FeOOH→γ-FeOOH→Fe3O4。在此條件下,能可控獲得結(jié)構(gòu)穩(wěn)定的γ-FeOOH和Fe304兩種磁性納米材料。5、通過(guò)葡萄糖的適量添加,實(shí)現(xiàn)了BiOCl與P-FeOOH兩種納米材料的有效復(fù)合,成功獲得了可見光催化性能優(yōu)異的β-FeOOH/BiOCl復(fù)合光催化劑。光催化實(shí)驗(yàn)表明,獲得的新型復(fù)合催化劑能有效降解污水中的甲基橙等有機(jī)污染物,在本文的實(shí)驗(yàn)中,降解率可達(dá)70%左右。6、對(duì)所研究的內(nèi)容進(jìn)行進(jìn)一步的總結(jié)和梳理,在現(xiàn)有實(shí)驗(yàn)成果的基礎(chǔ)上對(duì)本課題的所需繼續(xù)進(jìn)行的工作提出合理的建議和可行的實(shí)驗(yàn)方案,以便后續(xù)的研究工作能更順利地展開�？傊�,這些工作拓展了β-FeOOH納米材料的合成和轉(zhuǎn)變方法,通過(guò)分別在氣相和液相條件下對(duì)制備的β-FeOOH納米晶進(jìn)行逐步還原探究,加深了對(duì)β-FeOOH還原過(guò)程的理解,同時(shí)也成功的制備出了催化性能優(yōu)異的β-FeOOH/BiOCl復(fù)合納米材料。這些工作既可為發(fā)展磁性材料提供參考,也可望為建立基于可見光催化劑,具有實(shí)用價(jià)值的有機(jī)污染物治理新技術(shù)提供新的思路。
[Abstract]:尾 -FeOOH is a functional material with excellent properties. It can be used as precursor of pigment, catalyst, magnetic recording medium, magnetic coating and gas sensor. At the same time, 尾 -FeOOH is a good precursor for the synthesis of various magnetic materials, such as Fe _ 3O _ 4, 緯 -Fe _ 2O _ 3 and Fe. For example, the magnetic particles (iron or 緯 -Fe _ 2O _ 3) used in video tapes are obtained by calcination of 尾 -FeOOH precursors at high temperatures. The magnetic material obtained by this method has good properties and low cost, so it has a good application prospect. However, the controlled synthesis of 尾 -FeOOH precursors, the reduction process and the conversion process of the products are still worthy of further study. According to the characteristics of environmental friendliness and reduction, the modification and preparation of 尾 -FeOOH were carried out, and various magnetic nanomaterials were produced with 尾 -FeOOH as precursor. The possible mechanisms of various magnetic transformation products were explored. The main work of this paper is as follows: 1. The present research situation of 尾 -FeOOH is introduced. The preparation methods, the main research directions, the relationship between 尾 -FeOOH and other iron oxides, the main application and structure characteristics of 尾 -FeOOH are introduced in detail. On the basis of summing up and summing up the research contents of this paper, a feasible scheme. 2. Five kinds of 尾 -FeOOH nanocrystals were successfully designed by different synthesis methods, and various forms of 尾 -FeOOH nanocrystals were synthesized stably. XRD, SEM. The reduction process of P-FeOOH nanocrystals prepared by experiments at 100 鈩，

本文編號(hào)：2022095