本文選題：PVP + BiOBr�。� 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：Bi系半導(dǎo)體光催化材料因其獨(dú)特的結(jié)構(gòu),合適的禁帶寬度而具有良好的光催化活性,受到廣大研究者關(guān)注。然而對(duì)于純相Bi系光催化材料而言,其易發(fā)生光腐蝕現(xiàn)象、電子空穴復(fù)合率高、難以回收等缺點(diǎn)制約了其在實(shí)際工業(yè)中的應(yīng)用和發(fā)展。本文選取化學(xué)性質(zhì)穩(wěn)定、禁帶寬度適中、吸光范圍廣及環(huán)境友好的BiFeO_3及BiOBr為研究對(duì)象,并針對(duì)其缺點(diǎn),以性能為導(dǎo)向進(jìn)行了一系列適當(dāng)?shù)母男�。具體開展的主要工作及研究結(jié)果如下:(1)采用PVP輔助溶劑熱法成功制備了分散均勻的空心微球狀BiOBr~-海泡石復(fù)合光催化劑(PVP/BiOBr/AS)。利用SEM、XRD、FTIR、XPS、UV-Vis等表征技術(shù)對(duì)其形貌特征、晶相結(jié)構(gòu)、元素價(jià)態(tài)、吸光性能等進(jìn)行了測(cè)試分析,結(jié)果表明改性后的復(fù)合催化劑團(tuán)聚現(xiàn)象降低,光吸收性能增加,電子空穴復(fù)合率也顯著降低。(2)以羅丹明B(RhB)為目標(biāo)污染物評(píng)價(jià)了不同海泡石含量的PVP/BiOBr/AS復(fù)合光催化劑的催化活性,優(yōu)選出海泡石最佳摻雜量為6%,光催化降解RhB120min時(shí),脫色率100%,TOC的去除率為75.3%,明顯優(yōu)于純相BiOBr。光催化降解RhB的最佳反應(yīng)條件:催化劑投加量為1.0g/L,溶液初始濃度為10mg/L,溶液的初始pH為5。以最佳配比的PVP/BiOBr/AS(6%)復(fù)合光催化劑降解雙氯芬酸鈉,表現(xiàn)出良好的催化性能,表明復(fù)合催化劑適用范圍較廣。(3)采用水熱法制備了異質(zhì)結(jié)結(jié)構(gòu)的斜方六面體BiFeO_3/CdS復(fù)合光催化劑。利用SEM、XRD、BET、UV-Vis等表征技術(shù)對(duì)其形貌特征、晶相結(jié)構(gòu)、比表面積、吸光性能等進(jìn)行了測(cè)試分析。以羅丹明b(RhB)為目標(biāo)污染物評(píng)價(jià)了不同CdS含量的BiFeO_3/CdS復(fù)合光催化劑的催化活性,結(jié)果表明BiFeO_3/CdS復(fù)合光催化劑催化活性和穩(wěn)定性都得到了提升,在一定程度上解決了BiFeO_3光催化性能不夠高和CdS易光腐蝕等問題。(4)進(jìn)行自由基捕獲實(shí)驗(yàn)考察反應(yīng)過程中活性物種。結(jié)果表明:O2·-、h+、·OH均參與PVP/BiOBr/AS降解有機(jī)物的過程,其中O2·-起主要作用。在BiFeO_3/CdS光催化降解RhB過程中,O2·-是主要活性物種。(5)由GC-MS和UV-Vis DRS測(cè)試分析可知,在PVP/BiOBr/AS催化劑降解RhB過程中,RhB首先發(fā)生脫乙基過程,而后在自由基的作用下發(fā)生苯環(huán)裂解。生成了化合物十六酸、油酸和對(duì)二苯酚,隨著反應(yīng)時(shí)間的增加,自由基逐步將污染物降解成己二酸、戊二酸等小分子化合物,最后被礦化成CO2、H2O。
[Abstract]:Bi-based semiconductor photocatalytic materials have good photocatalytic activity due to their unique structure and suitable band gap. However, for the pure Bi system photocatalytic materials, the photocorrosion is easy to occur, the electron hole recombination rate is high, and it is difficult to recover, which restricts its application and development in practical industry. In this paper, BiFeO_3 and BiOBr, which have stable chemical properties, moderate bandgap, wide absorptivity and friendly environment, are selected as research objects, and a series of performance oriented modification are carried out according to their shortcomings. The main work and results are as follows: (1) PVP assisted solvothermal method was used to successfully prepare a well-dispersed hollow microsphere BiOBr-sepiolite composite photocatalyst (PVP / BiOBr-ASN). The morphology, crystal structure, elemental valence state and absorptivity of the modified composite catalysts were measured and analyzed by means of the SEMP-XRDX / FTRDX / XPS UV-Vis technique. The results showed that the agglomeration of the modified composite catalysts was decreased, and the photoabsorption properties of the modified catalysts were increased. The electron hole recombination rate was also significantly reduced. (2) the catalytic activity of PVP/BiOBr/AS composite photocatalyst with different sepiolite content was evaluated by using Rhodamine Bhh RhB) as the target pollutant. The optimum doping amount of sepiolite was 6 and the photocatalytic degradation of RhB120min was obtained. The removal rate of TOC was 75.3%, which was better than that of pure phase BiOBr. The optimum reaction conditions for photocatalytic degradation of RhB were as follows: the dosage of catalyst was 1.0 g / L, the initial concentration of the solution was 10 mg / L, and the initial pH of the solution was 5. The photocatalytic degradation of diclofenac sodium by PVP / BiOBr-AS6) composite photocatalyst shows good catalytic performance, indicating that the composite catalyst is suitable for a wide range. (3) Heterojunction structure oblique hexahedron BiFeO_3/CdS composite photocatalyst has been prepared by hydrothermal method. The morphology, crystal phase structure, specific surface area and absorptivity were measured and analyzed by means of SEMX (XRDX) BET-UV-Vis. The catalytic activity of BiFeO_3/CdS composite photocatalyst with different CdS content was evaluated by using Rhodamine CdS as the target pollutant. The results showed that the catalytic activity and stability of BiFeO_3/CdS composite photocatalyst were improved. To some extent, the problem of BiFeO_3 photocatalysis is not high enough and CdS is easy to corrode. 4) the free radical trapping experiment is carried out to investigate the active species in the reaction process. The results showed that both O _ 2 -O _ 2 and OH were involved in the degradation of organic matter by PVP/BiOBr/AS, and O _ 2-played a major role in the degradation of organic matter. In the process of BiFeO_3/CdS photocatalytic degradation of RhB, O2- is the main active species. According to the analysis of GC-MS and UV-Vis DRS, it can be seen that the deethylation process occurs first and then benzene ring cleavage occurs under the action of free radical in the degradation of RhB by PVP/BiOBr/AS catalyst. The compounds hexadecanoic acid, oleic acid and p-diphenol were formed. With the increase of reaction time, the pollutants were gradually degraded into adipic acid, glutaric acid and other small molecular compounds, which were mineralized to CO _ 2H _ 2O.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X703;TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孟婉婉;胡瑞生;楊軍;杜燕飛;李景佳;王宏葉;;La摻雜BiFeO_3對(duì)苯酚光催化降解性能的影響（英文）[J];催化學(xué)報(bào);2016年08期

2 王春英;朱清江;谷傳濤;石湖泉;張大超;余長林;;稀土Ce~(3+)摻雜Bi_2WO_6光催化降解羅丹明B的研究[J];中國環(huán)境科學(xué);2015年09期

3 董多;宋恩軍;車寅生;楊長秀;王敏;高興瑩;;硼和鉺共摻雜BiVO_4光催化降解羅丹明B的研究[J];工業(yè)水處理;2015年05期

4 Guo-Hua Jiang;Xia Li;Zhen Wei;Teng-Teng Jiang;Xiang-Xiang Du;Wen-Xing Chen;;Effects of N and/or S Doping on Structure and Photocatalytic Properties of BiOBr Crystals[J];Acta Metallurgica Sinica(English Letters);2015年04期

5 付丹;;納米TiO_2在有機(jī)污水治理領(lǐng)域的研究進(jìn)展[J];遼寧化工;2015年03期

6 康可佳;劉薇;劉僑博;曾紅云;潘保原;;電芬頓降解羅丹明B影響因素研究[J];現(xiàn)代農(nóng)業(yè)科技;2015年03期

7 肖劍;張穎心;尤玉靜;;三維花狀BiOBr/CNTs復(fù)合光催化劑降解羅丹明廢水研究[J];應(yīng)用化工;2014年09期

8 王燕琴;瞿夢(mèng);馮紅武;程小芳;;鹵氧化鉍光催化劑的研究進(jìn)展[J];化工進(jìn)展;2014年03期

9 劉亞子;何宇翔;楊紹貴;陳鴻哲;;BiFeO_3可見光催化降解甲基紫[J];化工環(huán)保;2013年06期

10 林立;黃滿紅;龍立平;陳亮;陳東輝;;鹵氧化鉍異質(zhì)結(jié)型可見光光催化劑的新進(jìn)展[J];材料導(dǎo)報(bào);2013年19期

相關(guān)博士學(xué)位論文 前2條

1 沈建超;二氧化鈦/大尺寸多孔窄帶隙半導(dǎo)體復(fù)合材料制備及其可見光催化性能研究[D];浙江大學(xué);2015年

2 簡子聰;二氧化鈦基復(fù)合催化劑的合成、表征及光催化活性的研究[D];華南理工大學(xué);2014年

相關(guān)碩士學(xué)位論文 前10條

1 陳靜;鎢基納米半導(dǎo)體材料的制備及催化性能研究[D];東南大學(xué);2016年

2 黃春輝;活性炭微球/TiO_2復(fù)合光催化劑制備及其降解陽離子紅研究[D];湘潭大學(xué);2015年

3 方文雪;石墨相氮化碳基可見光催化劑的制備及光降解性能研究[D];鄭州大學(xué);2015年

4 劉玉潔;Bi基氧化物與Ti0_2復(fù)合材料的制備及光催化性能[D];大連理工大學(xué);2015年

5 湯海波;鉍基光催化劑的制備及其光催化活性的研究[D];河南師范大學(xué);2015年

6 陶亞茹;鉍系半導(dǎo)體光催化劑的制備及其對(duì)有機(jī)污染物的降解研究[D];東華大學(xué);2015年

7 朱培娟;溴化氧鉍（BiOBr）光催化降解橙黃Ⅱ和亞甲基藍(lán)的研究[D];華東師范大學(xué);2014年

8 邸麗景;BiFeO_3光催化劑的制備及其改性研究[D];蘭州理工大學(xué);2014年

9 葉坪;鹵氧鉍基光催化劑的制備及其性能的研究[D];浙江師范大學(xué);2014年

10 王伶俐;鹵氧化鉍BiOX（X= Cl，Br，I）的制備及對(duì)有毒有機(jī)污染物降解機(jī)理研究[D];三峽大學(xué);2013年

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本文編號(hào)：1828528