Sn4+ and S2− co-doped N–TiO2−x nanoparticles for efficient and photocatalytic removal of contaminants,Catalysis Science & Technology

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Sn4+ and S2− co-doped N–TiO2−x nanoparticles for efficient and photocatalytic removal of contaminants
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0cy00463d
Jiahui He _{1,

2,

3,

4,

5} , Jin Ye _{1,

2,

3,

4,

5} , Kai Ge _{1,

2,

3,

4,

5} , Jiayu Cao _{1,

2,

3,

4,

5} , Congcong Fu _{1,

2,

3,

4,

5} , Zhenxing Li _{1,

2,

3,

4,

5} , Yue Zhang _{1,

2,

3,

4,

5} , Yongfang Yang _{1,

2,

3,

4,

5}

Affiliation

N–TiO_2−x nanoparticles (NPs) were selected as a basic construction unit because there are many Ti³⁺ and O vacancies on its surface. When S²⁻ and Sn⁴⁺ are co-doped into the N–TiO_2−x lattice, the O²⁻ and Ti⁴⁺ atoms can be replaced, respectively. The formation of dopant energy levels from Sn⁴⁺ and S²⁻ in Sn⁴⁺/S²⁻/N–TiO_2−x causes an obvious red shift to the visible light region. The recombination rate of the e⁻/h⁺ pairs was significantly reduced due to the fast migration and separation of the electrons as a result of the energy level doping from Sn⁴⁺ and S²⁻ and the formation of electron traps with Sn⁴⁺. The N–TiO_2−x NP band gap was significantly narrowed from 3.07 eV to 0.77 eV upon co-doping with Sn⁴⁺ and S²⁻, resulting in the superior photocatalytic activity of the Sn⁴⁺/S²⁻/N–TiO_2−x NPs. The photocatalytic reduction rate of Cr(VI) increased by 11.6 times and the photodegradation rate of doxycycline hydrochloride (DH) achieved about 5.7 times that of the original N–TiO_2−x NPs. This study provided a simple approach to preparing metal and non-metal co-doped N–TiO_2−x NPs, which could greatly improve the removal efficiency of contaminants via their synergistic effect.

中文翻译：

Sn4 +和S2-共掺杂的N–TiO2-x纳米颗粒，可有效地光催化去除污染物

选择N–TiO ₂ – _x纳米粒子（NPs）作为基本结构单元，因为其表面上有许多Ti ³⁺和O空位。当S ^2-和Sn ⁴⁺共掺杂到N-TiO _{2- x}晶格中时，O ^2-和Ti ⁴⁺原子可以分别被取代。Sn ⁴⁺ / S ^2- / N–TiO ₂_x中Sn ⁴⁺和S ²⁻的掺杂能级形成导致可见光区域发生明显的红移。电子的再结合率^- / H ⁺由于从Sn ⁴⁺和S ^2-掺杂能级以及形成具有Sn ⁴⁺的电子陷阱，电子的快速迁移和分离大大减少了电子对。与Sn ⁴⁺和S ^2-共掺杂时，N–TiO _{2− x} NP带隙从3.07 eV显着缩小至0.77 eV ，从而使Sn ⁴⁺ / S ²⁻ / N–具有优异的光催化活性。TiO _2-_x NPs。Cr（VI的光催化还原率）增加了11.6倍，而盐酸多西环素（DH）的光降解率达到了原始N–TiO _{2− x} NP的5.7倍。这项研究提供了一种简单的方法来制备金属和非金属共掺杂的N-TiO ₂ - _x NPs，通过它们的协同作用可以大大提高污染物的去除效率。

更新日期：2020-07-21

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