壓電光協(xié)同作用下m-Bi2O4對磺胺甲基嘧啶的催化降解研究

摘要 采用簡單的水熱法制備m-Bi₂O₄，并利用XRD、XPS、SEM、TEM、UV-vis DRS、PFM等表征手段對樣品結構、形貌、表面價態(tài)以及壓電光催化性能進行分析.以磺胺甲基嘧啶（SM）為模擬污染物，測試了材料的壓電光催化活性.結果表明，與BaTiO₃和BiOCl相比，m-Bi₂O₄表現(xiàn)出了較高的催化性能.在壓電光協(xié)同作用60 min后，對SM的降解效率高達96.46％.通過改變光的波長條件，證實m-Bi₂O₄在光能減弱條件下仍具有較高的催化活性.此外，通過活性自由基捕獲實驗證實反應體系中產生了高氧化活性的超氧自由基以及少量羥基自由基和單線態(tài)氧，并提出了一種可能的壓電光催化機理.

關鍵詞m-Bi₂O₄;磺胺甲基嘧啶;壓電光催化;光催化

中圖分類號TB332；O643.36

文獻標志碼A

0引言

近年來，抗生素濫用造成的水污染問題引起了全世界的廣泛關注.磺胺甲基嘧啶（SM）是養(yǎng)殖和畜牧用量最大的抗生素［1-2］.大部分磺胺類抗生素在動物體內不能被完全吸收，未吸收的部分通過排泄的方式直接進入生態(tài)系統(tǒng)，對生態(tài)系統(tǒng)造成潛在威脅.

1實驗部分

1.1試劑和儀器

1.2樣品的制備及表征

1.2.1四氧化二鉍的制備

1.2.2材料表征方法

采用X射線衍射（XRD）分析晶體結構;采用掃描電子顯微鏡（SEM）和透射電子顯微鏡（TEM）分析樣品形貌;采用X射線光電子能譜（XPS）分析催化劑官能團結構和元素組成;采用紫外-可見分光光度計（UV-vis）分析光吸收性能;采用壓電響應力顯微鏡（PFM）分析樣品壓電特性;Mott-Schottky圖由電化學工作站（CHI660E）測定，其中Ag／AgCl和Pt片分別作為參比電極和對電極.

1.2.3壓電光催化活性實驗

2結果和討論

2.1樣品的XPS與XRD分析

2.2樣品的形貌分析

2.3樣品的PFM分析

2.4樣品的光學性能分析

2.5壓電光催化降解SM

2.6光的波長對降解SM的影響

2.7壓電光催化降解機理討論

3結論

參考文獻

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Catalytic degradation of sulfamethazine by m-Bi2O4 via synergistic piezoelectric-light effect

ZHU Jiawei1CHEN Haoxuan1LIU Fengling1GUO Zhaobing1QIU Pengxiang1

1School of Environmental Science and Engineering／Jiangsu Key Laboratory of Atmospheric Environment Monitoring and

Pollution Control／Collaborative Innovation Center of Atmospheric Environment and Equipment Technology，

Nanjing University of Information Science ＆ Technology，Nanjing 210044，China

AbstractIn this paper，we prepare m-Bi2O4 via a simple hydrothermal method，and analyze its structure，morphology，surface valence and piezoelectric photocatalytic performance using characterization methods such as XRD，XPS，SEM，TEM，UV-vis DRS and PFM.Furthermore，we test the piezoelectric photocatalytic activity of the material using sulfamethazine （SM） as a simulated pollutant.The results show that m-Bi2O4 outperforms BaTiO3 and BiOCl in catalytic performance，indicated by its high SM degradation efficiency （96.46％） after 60 min of synergistic piezoelectric-light action，and m-Bi2O4 still holds high catalytic activity under weakening light energy.In addition，superoxide radicals with high oxidation activity and a small amount of hydroxyl radicals and singlet oxygen have been captured in the reaction system.We also propose a possible mechanism of piezoelectric photocatalysis.

Key wordsm-Bi2O4;sulfamethazine （SM）;piezoelectric photocatalysis;photocatalysis