畢業(yè)設(shè)計(jì)說明書中文摘要

    錫酸鉍Bi2Sn2O7（BSO）是一種新型半導(dǎo)體光催化材料，具有價(jià)廉、無毒、化學(xué)性質(zhì)穩(wěn)定等優(yōu)點(diǎn)，但單一相的BSO光催化活性低。本文通過高溫固相法首次制備出不同氮化碳（g-C3N4）含量的錫酸鉍/氮化碳（BSO/g-C3N4）復(fù)合光催化劑。利用XRD、TEM、SEM、XPS、UV-vis分別對(duì)樣品的晶型、組成和形貌等性能進(jìn)行了表征，并以亞甲基藍(lán)溶液作為模擬污染物，通過亞甲基藍(lán)溶液在可見光下的降解來評(píng)價(jià)光催化活性的大小。實(shí)驗(yàn)結(jié)果表明與g-C3N4復(fù)合之后的BSO其可見光響應(yīng)區(qū)變寬，光催化活性明顯增強(qiáng)。并且g-C3N4復(fù)質(zhì)量分?jǐn)?shù)為60%時(shí)復(fù)合樣品的結(jié)晶形態(tài)最好，光催化效率最高。這可能是由于復(fù)合光催化劑比表面積增大，光生電子與空穴的分離加快。

關(guān)鍵詞  錫酸鉍Bi2Sn2O7(BSO) 氮化碳g-C3N4 復(fù)合材料 光催化

 

畢業(yè)設(shè)計(jì)說明書外文摘要

Title   The  fabrication  of  Bi2Sn2O7/g-C3N4  composite  material                   

        and  appliaction  in  photocatalysis                                

Abstract

Bi2Sn2O7(BSO) is a new semiconductor which has a promising applicaiton in photocatalysis due to its low-cost, non-toxicity and chemical-stability. However, the photocatalytic activity of single phase BSO is not satisfying . In this paper, for the first time, BSO/g-C3N4 composite photocatalysts were synthesized by high temperature solid-state recation method and different contents of g-C3N4 for the photocatalytic activity was studied. The obtained BSO/g-C3N4 was characterized by XRD, TEM, SEM, XPS and UV-vis. We eva luated the photocatalytic activity through the degradation of methylene blue as a target pollutant under visible light. The result showed the photocatalytic performance of the BSO/g-C3N4 composites under visible light irradiation was enhanced compared with pure BSO. In addition, the best crystal morphology and photocatalytic efficiency was achieved when the mass ratio of g-C3N4 was 60%. The excellent photocatalytic performance was attributed to the increased surface area and efficient separation of photogenerated electrons and holes result from the coupling of BSO and g-C3N4.

Keywords  Bismuth stannate Bi2Sn2O7(BSO)  Carbon nitride g-C3N4  Composite material   photocatalysis

 

目   次

1  緒論 1

1.2   BSO粉末材料的制備方法 2

1.2.1  水熱合成法 2

1.2.2  高溫固相法 3

1.2.3  溶膠凝膠法(膠體化學(xué)法) 3

1.3  提高半導(dǎo)體光催化效率的方法 4

1.3.1  離子摻雜 4

1.3.2  非金屬元素?fù)诫s 4

1.3.3  復(fù)合半導(dǎo)體 4

1.3.4  表面負(fù)載 5

1.4  本文研究?jī)?nèi)容及思路 5

1.5  表征方法和原理 6

1.5.1  X射線衍射(XRD) 6

1.5.2  掃描電子顯微鏡(SEM） 6

1.5.3  透射電子顯微鏡(TEM） 7

1.5.4  紫外可見漫反射光譜(UV-vis DRS） 7

1.5.5   X射線光電子能儀(XPS) 7

2  催化劑的制備 8

2.1  實(shí)驗(yàn)藥品與儀器 8

2.1.1  實(shí)驗(yàn)藥品 8

2.1.2實(shí)驗(yàn)儀器與設(shè)備 8

2.2  實(shí)驗(yàn)步驟 8

2.2.1  粉末的制備 8

2.2.2  催化劑性能測(cè)試 9

3  結(jié)果與討論 10

3.1  物相及形貌分析 10

3.2  元素分析 12

3.3  紫外一可見吸收分析 13

3.4  光催化結(jié)果分析 14

4  光催化降解機(jī)理 16

結(jié)  論 17

致    謝 19

參 考 文 獻(xiàn) 20