دانلود رایگان مقاله لاتین درمان واکنسی از سایت الزویر
عنوان فارسی مقاله:
ابتکار عمل، روش درمان واکنسی ساده و تاثیر خواص فتوشیمیایی
عنوان انگلیسی مقاله:
An initiative, simple vacancy remedy method and the effect on photochemical properties
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
As an advanced oxidation technology, solar energy-driven photocatalysis has drawn considerable attention. Unfortunately, its practical application is still limited by the low utilization of solar energy and low quantum efficiency. In the past decades, various strategies have been tried to solve the problems, such as band gap engineering, crystal modification, interfacial heterojunction, andso on [1]. However, it is still a big challenge to develop efficient photocatalysts. Recently, tungsten trioxide (WO3) has attracted much attention due to its abundant reserves, nontoxicity and excellent optical property [2–6]. As an n-type semiconductor, WO3 (Eg = 2.5–2.8 eV) exhibits approximately 12% absorption of solar energy [2]. Because of its low conduction band edge (0.3–0.5 vs. normal hydrogen electrode (NHE)), however, the conduction band electrons of WO3 cannot react with O2 (E0(O2/O2 •−) = −0.33 vs. NHE and E0(O2/HO2 •) = −0.05 vs. NHE) [7–9]. Consequently, its photocatalytic activity is significantly reduced by the fast recombination rate of electrons and holes. Hence, it is desirable to develop a new method to solve this disadvantage. To date, many studies have reported thatthe fluorination of semiconductor can efficiently enhance the photocatalytic activities [1,10–16], e.g., TiO2 [10–13],
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کلمات کلیدی:
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