Characteristics and performance of rutile/anatase/brookite TiO2 and TiO2–Ti2O3(H2O)2(C2O4)·H2O multiphase mixed crystal for the catalytic degradation of emerging contaminants,CrystEngComm

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Characteristics and performance of rutile/anatase/brookite TiO2 and TiO2–Ti2O3(H2O)2(C2O4)·H2O multiphase mixed crystal for the catalytic degradation of emerging contaminants
CrystEngComm ( IF 2.6 ) Pub Date : 2020/01/15 , DOI: 10.1039/c9ce01694e
Kangkai Hu _{1,

2,

3,

4} , Lei E _{1,

2,

3,

4,

5} , Dan Zhao _{1,

2,

3,

4,

5} , Yajing Li _{2,

3,

4,

6} , Wei Zhao _{1,

2,

3,

4,

5} , Hui Rong _{1,

2,

3,

4,

5}

Affiliation

Rutile TiO₂ and binary/ternary/quaternary the TiO₂–Ti₂O₃(H₂O)₂(C₂O₄)·H₂O mixed crystal possessing self-assembled morphology and serving as catalysts for the photocatalytic degradation of organic pollutants or as photoanodes for photoelectrochemical (PEC) water splitting have been prepared by in situ growth via changing the concentration of potassium titanyl oxalate. The rutile/anatase TiO₂ with mesoporous structure has a specific surface area of 27.896 m² g⁻¹ and an average pore size of 3.411 nm. The sample has a relatively more regular self-assembly morphology after heat-treatment at different temperatures; however, its photocatalytic activity is reduced. Excellent catalytic oxidation of methyl orange (MO) and hydroxylbenzoic acid (HBA) is observed on the as-synthesized samples, wherein rutile/anatase TiO₂ and rutile/anatase/brookite TiO₂–Ti₂O₃(H₂O)₂(C₂O₄)·H₂O show excellent photocatalytic activity under UV-light. With the novel TiO₂–Ti₂O₃(H₂O)₂(C₂O₄)·H₂O mixed crystal catalyst, this study illustrates the photocatalysis mechanism of a multiphase mixed crystal for the removal of emerging contaminants in water. Based on the Mott–Schottky, XPS and energy band structure data, we consider that an indirect Z-scheme transmission mode is generated between rutile/anatase TiO₂ or TiO₂–Ti₂O₃(H₂O)₂(C₂O₄)·H₂O mixed crystal, wherein the photo-induced electrons in rutile TiO₂ combined with the holes in anatase TiO₂ or Ti₂O₃(H₂O)₂(C₂O₄)·H₂O, leading to enhanced charge carrier extraction and utilization upon photoexcitation.

中文翻译：

金红石/锐钛矿/板钛矿TiO2和TiO2-Ti2O3（H2O）2（C2O4）·H2O多相混合晶体的特性和性能

金红石型TiO ₂和二元/三元/四元的TiO ₂ -Ti ₂ O ₃（H ₂ O）₂（C ₂ O ₄）·H ₂ O混合晶体，具有自组装形态，可作为光催化降解有机物的催化剂通过改变钛氧基乙二酸钾的浓度就地生长，已经制备了污染物或作为光电化学（PEC）水分解用的光阳极。具有中孔结构的金红石/锐钛矿TiO ₂的比表面积为27.896 m ² g ^-1平均孔径为3.411 nm。在不同温度下热处理后，样品具有相对规则的自组装形态。但是，其光催化活性降低。在合成后的样品中观察到甲基橙（MO）和羟基苯甲酸（HBA）具有出色的催化氧化作用，其中金红石/锐钛矿TiO ₂和金红石/锐钛矿/板钛矿TiO ₂ -Ti ₂ O ₃（H ₂ O）₂（ C ₂ O ₄）·H ₂ O在紫外线下显示出优异的光催化活性。使用新型的TiO ₂ -Ti ₂ O ₃（H ₂ O）₂（C₂ O₄）·H₂ O混合晶体催化剂，本研究说明了多相混合晶体的光催化机理，用于去除水中的新兴污染物。基于Mott–Schottky，XPS和能带结构数据，我们认为在金红石/锐钛矿TiO₂或TiO₂ -Ti₂ O₃（H₂ O）₂（C₂ O）之间产生了间接Z方案传输模式。₄）·H₂ O混合晶体，其中金红石型TiO_2中的光致电子与锐钛矿型TiO中的空穴结合₂或Ti₂ O₃（H₂ O）₂（C₂ O₄）·H₂ O，导致光激发时电荷载流子的提取和利用率提高。

更新日期：2020-02-13

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