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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Preparation and Visible Light Photocatalytic Activity of a Graphite-Like Carbonaceous Surface Modified TiO2 Photocatalyst
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Preparation and Visible Light Photocatalytic Activity of a Graphite-Like Carbonaceous Surface Modified TiO2 Photocatalyst

机译：石墨状碳质表面改性TiO2光催化剂的制备及可见光催化活性

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By using water-soluble linear phenolic resin (PF) as C-source, a graphite-like carbonaceous surface modified TiO2 photocatalyst (PF/TiO2) was successfully synthesized through a hydrothermal process. The as-formed PF/TiO2 exhibited significantly higher photocatalytic activity than bare TiO2 toward the degradation of methyl orange (MO) under visible irradiation, while a tetrahydrofuran (THF) postrinsing operation can further enhance the photocatalytic activity of PF/ TiO2. To exploit the mystery of surface carbonaceous covering,a series of characterizations such as XPS, TG, TEM, and FTIR, as well as ~1H NMR were employed. It is proposed that PF experienced a cross-linking and a carbonization process that are catalyzed by TiO2 at the surface of TiO2. The as-formed organics covering on the PF/TiO2 seems composed of four portions from the surface of TiO2 to the outside as oxidized graphite-like carbon (OGC), graphite-like carbon (GC), cross-linked PF (cl-PF), and PF. OGC and GC substances endow the catalysts visible absorption and photocatalytic activity, which are insoluble in the THF; meanwhile, PF and cl-PF are adverse to the visible light photocatalysis and can be rinsed out with THF. The visible light photocatalytic activity unrinsed PF/TiO2 reaches its optimal condition at a PF dosage of 0.7 g (for 5.0 g titanium sulfate) while the THF rinsed PF/TiO2 presents the highest photocatalytic activity with the maximum PF dosage in this work and gives a MO degradation rate of 100% in 4 h.
机译：以水溶性线性酚醛树脂（PF）为碳源，通过水热法成功合成了石墨状碳质表面改性TiO2光催化剂（PF / TiO2）。形成的PF / TiO2在可见光照射下对甲基橙（MO）的降解表现出比裸露的TiO2高得多的光催化活性，而四氢呋喃（THF）后漂洗操作可以进一步增强PF / TiO2的光催化活性。为了探索表面碳质覆盖物的奥秘，采用了一系列表征，例如XPS，TG，TEM和FTIR以及〜1H NMR。提出了PF经历了在TiO 2表面被TiO 2催化的交联和碳化过程。覆盖在PF / TiO2上的有机物似乎是从TiO2的表面到外面的四部分组成的，分别是氧化的类石墨碳（OGC），类石墨碳（GC），交联的PF（cl-PF）。 ）和PF。 OGC和GC物质赋予了催化剂可见的吸收和光催化活性，它们不溶于THF。同时，PF和cl-PF不利于可见光的光催化作用，可以用THF冲洗掉。 PF量为0.7 g（对于5.0 g硫酸钛）时，未漂洗的PF / TiO2的可见光催化活性达到最佳条件，而THF漂洗的PF / TiO2在此工作中呈现最高的光催化活性和最大的PF剂量，并给出了MO在4小时内的降解率达到100％。

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