Piezoelectric materials can convert mechanical energy into electrical energy, and further piezocatalysis can be designed based on the product between piezoelectric effect and electrochemical redox effect, which is hopeful for the actual dye decomposition. Tourmaline is a natural mineral with spontaneous polarization, which is an ideal piezocatalytic material and is rarely reported in dye decomposition. In this work, after 100 mg tourmaline powder is vibrated for 120 min, the piezocatalytic dye decomposition ratios of rhodamine B (RhB), methylene blue, and methyl orange are ∼95%, ∼46%, and ∼23%, respectively. The corresponding first-order reaction kinetic values for these three dyes are 0.02681, 0.00639, and 0.00246 min⁻¹, respectively. By adjusting the pH value of the initial RhB solution to 5, the decomposition ratio can reach ∼99% after only 60 min of vibration. In the process of dye decomposition, it is determined that the main active substances are hydroxyl radicals and superoxide radicals via electron spin–resonance spectra test. The spontaneous polarization performance of tourmaline can effectively adsorb dye molecules to promote the catalytic reaction. Natural tourmaline minerals are abundant, low cost, and environmentally friendly making them suitable for large-scale piezocatalysis of mineral materials.

中文翻译：

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天然压电电气石矿物在振动下压电催化分解有机染料

压电材料可以将机械能转化为电能，并且可以基于压电效应和电化学氧化还原效应之间的乘积来设计进一步的压电催化，这有望用于实际的染料分解。电气石是一种具有自发极化的天然矿物，是一种理想的压电催化材料，在染料分解方面鲜有报道。在这项工作中，将 100 mg 电气石粉末振动 120 分钟后，罗丹明 B (RhB)、亚甲基蓝和甲基橙的压电催化染料分解率分别为 ∼95%、∼46% 和 ∼23%。这三种染料相应的一级反应动力学值分别为0.02681、0.00639和0.00246 min ^-1。通过将初始RhB溶液的pH值调节至5，仅振动60分钟后分解率即可达到∼99%。通过电子自旋共振谱测试确定染料分解过程中主要活性物质是羟基自由基和超氧自由基。电气石的自发极化性能可以有效吸附染料分子，促进催化反应。天然电气石矿物储量丰富、成本低廉、环境友好，适合大规模压电催化矿物材料。