Doping and Heterojunctional Cooperation of NaNbO3 by Fe and Their Photocatalytic Properties

doi:10.6023/A16080404

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (12): 995-1002.DOI: 10.6023/A16080404 Previous Articles Next Articles

Special Issue: 聚集诱导发光

Article

Fe对NaNbO₃的晶格掺杂和同步异质结改性及其光催化性能

崔素珍, 杨汉培, 孙慧华, 聂坤, 吴俊明

河海大学浅水湖泊综合治理与资源开发教育部重点实验室河海大学环境学院南京 210098

投稿日期:2016-08-12 发布日期:2016-11-24
通讯作者: 杨汉培 E-mail:yanghanpei@hhu.edu.cn
基金资助:
项目受国家重大科学仪器设备开发专项基金（No.2014YQ060773）和江苏省高校优势学科建设工程项目资助.

Doping and Heterojunctional Cooperation of NaNbO₃ by Fe and Their Photocatalytic Properties

Cui Suzhen, Yang Hanpei, Sun Huihua, Nie Kun, Wu Junming

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098

Received:2016-08-12 Published:2016-11-24
Supported by:
Project supported by the Foundation of National Key Scientific Instrument and Equipment Development Project of China (No. 2014YQ060773) and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

The perovskite-type NaNbO₃ were prepared through a solvothermal process under a moderate condition followed by calcinations at high temperature.The Fe³⁺-doping inside the NaNbO₃ lattice and the heterojunctions between α-Fe₂O₃ and NaNbO₃ were acquired synchronously in a similar process by treating NaNbO₃ with ferric nitrates.The photocatalytic activity of catalysts was evaluated from the photodegradation of Rhodamine B (RhB) in aqueous solution under UV light irradiation and the significant enhancement of degradation rate of aqueous RhB on modified NaNbO₃ was observed,with the degradation ratio of RhB reached as high as 95% within 1 h,and the quasi-first-grade rate constant of the RhB degradation reaction over the modified NaNbO₃ reached almost 7 times of the pristine one under the experimental conditions.Characterizations by X-ray diffraction (XRD),scanning electron microscopy (SEM),X-ray photoelectron spectroscopy (XPS),UV-vis diffuse reflectance spectrophotometry (DRS),adsorption-desorption of N₂ at low temperature (BET calculation),photoluminescence spectroscopy (PL),electron spin resonance spectroscopy (ESR) and photocurrent measurement were performed.The compositions and structures of the as-prepared raw and modified catalysts were carefully identified.It is found that the optimal mass fraction of Fe in modified catalysts is around 2.5%,with about 30% of it exists as Fe³⁺ inside the lattice of NaNbO₃ and the remainder as α-Fe₂O₃ outside the NaNbO₃ lattice.The results of characterizations or measurements suggest that a moderate Nb⁵⁺ in NaNbO₃ can be substituted by Fe³⁺ while the perovskite-type structure of NaNbO₃ remains unchanging.The moderate Fe-doping into the lattice of NaNbO₃ improved the photocatalytic performance of NaNbO₃ by the donor level of impurities,charge capturing and adsorption of dissolved oxygen.A fitting amount of α-Fe₂O₃ cooperates harmoniously with NaNbO₃ in degradation of RhB by enhancing the light quantum efficiency through the migration and jumping of electrons or holes between α-Fe₂O₃ and NaNbO₃.It is proposed that the modification (i) promotes the excitation of photocatalysts indicated by an improved light adsorption of modified catalysts on DRS,(ii) suppresses the recombination of photogenerated charge carriers revealed by PL spectra,and (iii) promotes the charge transfer founded by photocurrent measurements.

Key words: NaNbO₃, iron modification, photocatalysis, Rhodamine B, promotion mechanism

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Cui Suzhen, Yang Hanpei, Sun Huihua, Nie Kun, Wu Junming. Doping and Heterojunctional Cooperation of NaNbO₃ by Fe and Their Photocatalytic Properties[J]. Acta Chim. Sinica, 2016, 74(12): 995-1002.

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Fe对NaNbO₃的晶格掺杂和同步异质结改性及其光催化性能

Doping and Heterojunctional Cooperation of NaNbO₃ by Fe and Their Photocatalytic Properties

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Fe对NaNbO3的晶格掺杂和同步异质结改性及其光催化性能