...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Positive effect of Fe3+ ions on Bi2WO6, Bi2MoO6 and BiVO4 photocatalysis for phenol oxidation under visible light
【24h】

Positive effect of Fe3+ ions on Bi2WO6, Bi2MoO6 and BiVO4 photocatalysis for phenol oxidation under visible light

机译：积极的影响在Bi2WO6 Fe3 +离子,Bi2MoO6和BiVO4对苯酚光催化氧化在可见光下

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

It is known that Bi2WO6 (BiW), Bi2MoO6 (BiMo), and BiVO4 (BiV) under visible light are able to initiate organic oxidation by O-2. Herein we report a profound effect of Fe3+ ions on phenol oxidation in aqueous suspensions at an initial pH value of 3. Three solids were made via a hydrothermal method followed by calcination at 350 degrees C for 3 h. In the absence of Fe3+, phenol degradation followed pseudo-first-order kinetics. The normalized rate constant with respect to the solid surface area was BiV > BiMo > BiW, a trend similar to those of solid crystallite size and spectral absorption. In the presence of Fe3+, phenol degradation was fast initially and then became slow. Meanwhile, H2O2 formation was enhanced by Fe3+, while Fe2+ was produced with a yield of up to 100%. As the Fe3+ concentration increased, the initial rate of phenol degradation (R-0) changed. The maximum R-0 values of BiV, BiMo, and BiW were 4, 17, and 86 times larger than those measured without Fe3+, respectively. But the normalized R-0 to the initial amount of Fe3+ adsorption was in the order BiMo > BiW > BiV, a trend matching that of the Fe3+ adsorption constant. In the slow stage, interestingly, the first-order kinetics of phenol degradation resumed, with a rate constant much larger than that obtained without Fe3+. A study of electrochemistry showed that Fe2+ was oxidizable by O-2 to regenerate Fe3+. A possible mechanism is proposed involving Fe3+ reduction on different sites of bismuth photocatalysts.
机译：众所周知,Bi2WO6(车身),Bi2MoO6(毕摩)BiVO4(出)在可见光下就可以由0 2启动有机氧化。报告Fe3 +离子的苯酚产生深远的影响氧化水悬浮液在初始pH值值为3。水热法在煅烧紧随其后350度3 h。在缺乏Fe3 +,苯酚降解符合一级之后动力学。对固体表面区域BiV >毕摩>车身,这一趋势类似于固体微晶的大小和光谱吸收。Fe3 +,苯酚降解速度最初,然后变得缓慢。形成由Fe3 +增强,而价产生的收益率高达100%。浓度增加,初始的速度苯酚降解(R-0)改变。毕摩BiV的值,车身4、17和86没有Fe3 +倍比测量,分别。最初的Fe3 +吸附在订单毕摩>车身> BiV、匹配的趋势Fe3 +吸附常数。有趣的是,苯酚的一阶动力学恢复退化,速率常数比没有获得Fe3 +。电化学表明价可氧化的由0 2再生Fe3 +。机制提出了涉及Fe3 +减少不同网站的铋催化剂。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号