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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Facile ion-exchange synthesis of visible light active Sn-doped defect pyrochlore K_(0.51)Sb_(2.67)O_(6.26) and study of its photocatalytic activity
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Facile ion-exchange synthesis of visible light active Sn-doped defect pyrochlore K_(0.51)Sb_(2.67)O_(6.26) and study of its photocatalytic activity

机译：可见光活性锡掺杂缺陷烧绿石K_（0.51）Sb_（2.67）O_（6.26）的简易离子交换合成及其光催化活性的研究

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BACKGROUND:Sn-doped metal oxides have attracted considerable attention due to their potential applications in environmental remediation by degrading organic pollutants to less harmful byproducts and hydrogen generation from water splitting. Divalent tin was doped into defect pyrochlore K_(0.51S)b_(2.67)O_(6.26) (KSO) to improve its visible light photocatalytic activity. RESULTS:The Sn-doped K_(0.51S)b_(2.67)O_(6.26) (SSO)was obtained from parent KSO by an ion exchange method. The bandgap energy of KSO was reduced from 3.64 to 2.68 eV following Sn~(2+) doping into the KSO latttice. The photocatalytic activity of KSO and SSO was studied by degradation of methylene blue (MB) and rhodamine B (RhB) under visible light irradiation. SSO showed higher photodegrdation of MB and RhB whereas pristine KSO was almost inactive for the degradation of both dyes. CONCLUSIONS:TheMB and RhB degradation efficiency of SSO was 86 and 53%, respectively. The higher photocatalytic activity of SSO is attributed to more absorption of light energy in the visible region due to lowering of the bandgap energy as well as the generation of ?OH radicals during the photocatalytic reaction. Even after a fourth cycle of photodegradation of MB, the photocatalyst (SSO) was found to be stable, with amarginal decrease in the rate of degradation.
机译：背景：掺锡金属氧化物由于其在环境修复中的潜在应用而引起了相当大的关注，通过将有机污染物降解为危害较小的副产物和分解水产生氢气。将二价锡掺杂到有缺陷的烧绿石K_（0.51S）b_（2.67）O_（6.26）（KSO）中以提高其可见光光催化活性。结果：通过离子交换法从母体KSO获得了Sn掺杂的K_（0.51S）b_（2.67）O_（6.26）（SSO）。 Sn〜（2+）掺入KSO晶格后，KSO的带隙能从3.64 eV降低到2.68 eV。通过在可见光照射下降解亚甲基蓝（MB）和若丹明B（RhB）来研究KSO和SSO的光催化活性。 SSO显示MB和RhB的光降解更高，而原始KSO对两种染料的降解几乎没有活性。结论：SSO的MB和RhB降解效率分别为86％和53％。 SSO的较高的光催化活性归因于在光催化反应期间由于带隙能量的降低以及αOH自由基的产生而在可见光区域中更多的光能吸收。即使在MB的第四次光降解循环之后，也发现光催化剂（SSO）稳定，降解速率急剧下降。

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