国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 美國衛(wèi)生研究院文獻>Nanoscale Research Letters >Efficiently Visible-Light Driven Photoelectrocatalytic Oxidation of As(III) at Low Positive Biasing Using Pt/TiO2 Nanotube Electrode
【2h】

Efficiently Visible-Light Driven Photoelectrocatalytic Oxidation of As(III) at Low Positive Biasing Using Pt/TiO2 Nanotube Electrode

機譯：Pt / TiO2納米管電極在低正偏壓下高效可見光驅(qū)動的As（III）的光電催化氧化

代理獲取
本網(wǎng)站僅為用戶提供外文OA文獻查詢和代理獲取服務(wù)，本網(wǎng)站沒有原文。下單后我們將采用程序或人工為您竭誠獲取高質(zhì)量的原文，但由于OA文獻來源多樣且變更頻繁，仍可能出現(xiàn)獲取不到、文獻不完整或與標題不符等情況，如果獲取不到我們將提供退款服務(wù)。請知悉。
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關(guān)主題

摘要

A constant current deposition method was selected to load highly dispersed Pt nanoparticles on TiO2 nanotubes in this paper, to extend the excited spectrum range of TiO2-based photocatalysts to visible light. The morphology, elemental composition, and light absorption capability of as-obtained Pt/TiO2 nanotubes electrodes were characterized by FE-SEM, energy dispersive spectrometer (EDS), X-ray photoelectron spectrometer (XPS), and UV-vis spectrometer. The photocatalytic and photoelectrocatalytic oxidation of As(III) using a Pt/TiO2 nanotube arrays electrode under visible light (λ > 420 nm) irradiation were investigated in a divided anode/cathode electrolytic tank. Compared with pure TiO2 which had no As(III) oxidation capacity under visible light, Pt/TiO2 nanotubes exhibited excellent visible-light photocatalytic performance toward As(III), even at dark condition. In anodic cell, As(III) could be oxidized with high efficiency by photoelectrochemical process with only 1.2 V positive biasing. Experimental results showed that photoelectrocatalytic oxidation process of As(III) could be well described by pseudo-first-order kinetic model. Rate constants depended on initial concentration of As(III), applied bias potential and solution pH. At the same time, it was interesting to find that in cathode cell, As(III) was also continuously oxidized to As(V). Furthermore, high-arsenic groundwater sample (25 m underground) with 0.32 mg/L As(III) and 0.35 mg/L As(V), which was collected from Daying Village, Datong basin, Northern China, could totally transform to As(V) after 200 min under visible light in this system.
機譯：本文采用恒流沉積方法將高度分散的Pt納米顆粒負載在TiO2納米管上，以將TiO2基光催化劑的激發(fā)光譜范圍擴展到可見光。通過FE-SEM，能量色散譜儀（EDS），X射線光電子能譜儀（XPS）和紫外可見光譜儀對所得的Pt / TiO2納米管電極的形貌，元素組成和吸光能力進行了表征。在一個分開的陽極/陰極電解槽中研究了使用Pt / TiO2納米管陣列電極在可見光（λ> 420nm）照射下對As（III）的光催化和光電催化氧化。與在可見光下不具有As（III）氧化能力的純TiO2相比，即使在黑暗條件下，Pt / TiO2納米管也具有出色的可見光對As（III）的光催化性能。在陽極電池中，僅需1.2V正偏壓即可通過光電化學(xué)過程高效氧化As（III）。實驗結(jié)果表明，As（III）的光電催化氧化過程可以用擬一級動力學(xué)模型很好地描述。速率常數(shù)取決于As（III）的初始濃度，施加的偏置電勢和溶液pH。同時，有趣的是發(fā)現(xiàn)在陰極電池中，As（III）也被連續(xù)氧化為As（V）。此外，從中國北方大同盆地大營村采集的0.32 mg / L As（III）和0.35 mg / L As（V）的高砷地下水樣品（地下25 m）可以完全轉(zhuǎn)化為As（ V）在此系統(tǒng)中在可見光下200分鐘后。

著錄項

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
代理獲取

客服郵箱：kefu@zhangqiaokeyan.com

京公網(wǎng)安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯(lián)合信息科技 (北京) 有限公司?版權(quán)所有

  • 客服微信

  • 服務(wù)號