The piezoelectric Bi₂WO₆ nanosheets with in-plane spontaneous polarization were synthesized by hydrothermal method. The adsorption and piezocatalytic properties of the synthesized Bi₂WO₆ nanosheets were investigated upon different variants including synthesis conditions, model dye species, and pH of the dye solution. The materials exhibited positive surface charge and selective adsorption ability for the anionic dye methyl orange (MO) in acidic and neutral conditions. The ultrafast removal of MO (k_obs = 0.718 ppm s⁻¹) under ultrasonic vibration was mainly controlled by monolayer adsorption, which followed the pseudo-second-order adsorption kinetics and the Langmuir adsorption isotherm. To eliminate the interference of adsorption, the cationic Rhodamine B (RhB) was adopted as the target pollutant for piezocatalytic experiments. The maximum rate constant of RhB removal (3.9 × 10⁻² min⁻¹) was obtained in Bi₂WO₆ sample with the largest specific surface area of 32.8 cm² g⁻¹. The catalytic nature of the dye degradation phenomenon was confirmed by detection of free radicals and the quenching effect of radical scavengers. The present work demonstrates the potential of Bi₂WO₆ nanosheets in piezocatalytic applications. Moreover, the synergistic effect of adsorption and piezocatalysis is valuable for in-situ regeneration of the piezoelectric adsorbents.

采用水热法合成了面内自发极化的压电Bi ₂ WO ₆纳米片。在包括合成条件，模型染料种类和染料溶液pH值在内的不同变体上研究了合成的Bi ₂ WO ₆纳米片的吸附和压电催化性能。该材料在酸性和中性条件下对阴离子染料甲基橙（MO）表现出正表面电荷和选择性吸附能力。超快去除MO（k _obs  = 0.718 ppm s ^-1）超声振动主要由单层吸附控制，遵循伪二级吸附动力学和Langmuir吸附等温线。为了消除吸附的干扰，阳离子罗丹明B（RhB）被用作压电催化实验的目标污染物。在最大比表面积为32.8 cm ²  g ^-1的Bi ₂ WO ₆样品中获得了最大的RhB去除速率常数（3.9×10 ^-2  min ^-1）。通过检测自由基和自由基清除剂的猝灭作用证实了染料降解现象的催化性质。目前的工作表明Bi ₂ WO的潜力压电催化应用中的_6个纳米片。而且，吸附和压电催化的协同作用对于压电吸附剂的原位再生是有价值的。