Hierarchical structure Bi₂Mo_xW_1-xO₆ (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) solid solutions with high surface area are prepared by hydrothermal method without employing any surfactant. All the as-prepared products are hierarchical microspheres self-assembled by nanosheets. The piezocatalytic performance of Bi₂Mo_xW_1-xO₆ solid solutions are investigated by the degradation of RhB under ultrasonic vibration. The experimental results show that the x value of Bi₂Mo_xW_1-xO₆ has great influence on the piezocatalytic efficiency. Among which, the Bi₂Mo_0.4W_0.6O₆ presents a high value of the rate constant k of 0.119 min^-1 by degrading 97.5% of RhB dye solution in 30 min. It is about 43.4% higher than that of pure Bi₂WO₆ sample, for which k is 0.083 min^-1. Radical trapping test indicates that holes (h⁺) are the dominating active species in the degradation process. The improved piezocatalytic performance for Bi₂Mo_0.4W_0.6O₆ sample ascribes to the larger piezoelectric potential generated under a strained state, which facilitates the transfer of charge carriers and accelerate the piezocatalytic process. Our work presents a new design strategy of piezocatalysts for remediation of water pollution.

分级结构Bi ₂ Mo _x W _1-x O ₆ (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) 高表面积固溶体是通过水热法制备的，不使用任何表面活性剂。所有制备的产品都是由纳米片自组装的分级微球。通过超声振动降解RhB研究Bi ₂ Mo _x W _1-x O ₆固溶体的压电催化性能。实验结果表明，Bi ₂ Mo _x W _1-x O ₆的x值对压电催化效率有很大影响。其中，Bi ₂ Mo _0.4 W _0.6 O ₆通过在30分钟内降解97.5%的RhB染料溶液而呈现出0.119 min ^-1的高速率常数k值。它比纯 Bi ₂ WO ₆样品高约 43.4% ，其中k为 0.083 min ^-1。自由基捕获试验表明空穴 (h ⁺ ) 是降解过程中的主要活性物质。Bi ₂ Mo _0.4 W _0.6 O ₆压电催化性能的提高样品归因于在应变状态下产生的较大压电电势，这有利于电荷载流子的转移并加速压电催化过程。我们的工作提出了一种用于修复水污染的压电催化剂的新设计策略。