Effect of oxygen vacancies and crystal symmetry on piezocatalytic properties of Bi2WO6 ferroelectric nanosheets for wastewater decontamination,Environmental Science: Nano

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Effect of oxygen vacancies and crystal symmetry on piezocatalytic properties of Bi2WO6 ferroelectric nanosheets for wastewater decontamination
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-3-30 , DOI: 10.1039/d1en00022e
Zihan Kang _{1,

2,

3,

4,

5} , Enzhu Lin _{1,

2,

3,

4,

5} , Ni Qin _{1,

2,

3,

4,

5} , Jiang Wu _{1,

2,

3,

4,

5} , Baowei Yuan _{1,

2,

3,

4,

5} , Dinghua Bao _{1,

2,

3,

4,

5}

Affiliation

Piezocatalysis has emerged as a novel technique to make use of mechanical energy in dealing with organic pollutants in wastewater. In this work, ferroelectric Bi₂WO₆ (BWO) nanosheets with a characteristic layered crystal structure and in-plane polarization were investigated, with special interest in the influence of their crystal symmetry and oxygen vacancies on the piezocatalytic performance. The nanosheets were synthesized by a hydrothermal process along with thermal annealing at different temperatures and atmospheres. The crystal symmetry, grain size and oxygen vacancies of the crystals were characterized by XRD, SEM, XPS and Raman spectroscopy. The piezocatalytic properties were investigated by degrading Rhodamine B (RhB) solution under ultrasonic vibration. The free radicals generated by ultrasonic treatment were detected and characterized using the electron spin resonance (ESR) method. The essential role of hydroxyl radicals in the dye degradation process was demonstrated by controlled experiments with different scavenger additives. The results show that the crystalline size and oxygen vacancies affect the degree of orthorhombic distortion and formation of defect energy levels, respectively, which will further affect the distribution of piezoelectric potential and piezocatalytic activity. This work will enable us to understand the influence of oxygen vacancies and crystal symmetry on piezocatalysis more intuitively and design more efficient piezocatalysts via a heat treatment control strategy.

中文翻译：

氧空位和晶体对称性对Bi2WO6铁电纳米片压电催化净化废水的影响。

压电催化已经成为一种利用机械能处理废水中有机污染物的新技术。在这项工作中，铁电Bi ₂ WO ₆研究了具有特征性层状晶体结构和面内极化的（BWO）纳米片，特别关注其晶体对称性和氧空位对压电催化性能的影响。通过水热工艺以及在不同温度和气氛下的热退火来合成纳米片。用XRD，SEM，XPS和拉曼光谱对晶体的晶体对称性，晶粒尺寸和氧空位进行了表征。通过在超声振动下降解罗丹明B（RhB）溶液来研究压电催化性能。通过电子自旋共振（ESR）方法检测并表征了超声处理产生的自由基。羟基自由基在染料降解过程中的重要作用已通过使用不同清除剂添加剂的受控实验得到了证明。结果表明，晶体尺寸和氧空位分别影响正交晶畸变的程度和缺陷能级的形成，这将进一步影响压电势的分布和压电催化活性。这项工作将使我们能够更直观地了解氧空位和晶体对称性对压电催化的影响，并设计出更高效的压电催化剂这将进一步影响压电势的分布和压电催化活性。这项工作将使我们能够更直观地了解氧空位和晶体对称性对压电催化的影响，并设计出更高效的压电催化剂这将进一步影响压电势的分布和压电催化活性。这项工作将使我们能够更直观地了解氧空位和晶体对称性对压电催化的影响，并设计出更高效的压电催化剂通过热处理控制策略。

更新日期：2021-04-15

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