Abstract Inhibiting the recombination of photo-generated charge carriers remains one of the important challenges for photocatalytic materials nowadays. For this, we reported a series of novel bismuth layered structure ferroelectrics: M0.5Bi2.5Nb2O9 (M = Li, Na, K) nanosheets prepared by one-step hydrothermal method. The fabricated nanosheets with average thickness size of about 32 nm (Li0.5Bi2.5Nb2O9), 45 nm (Na0.5Bi2.5Nb2O9), 108 nm (K0.5Bi2.5Nb2O9) possess excellent photodegradation performance to various organic dye pollutants with high concentration of 20 mg/L [Rhodamine B (RhB), methyl orange (MO) etc.]. Interestingly, the degradation rate constants of RhB and MO can be further improved by polarization-induced charge separation under ultrasonic-assisted illumination condition, compared with those of light illumination alone, and increased by about 2.5 times for Na0.5Bi2.5Nb2O9 nanosheets. These findings make bismuth layered ferroelectric materials have a potential application in wastewater treatment as a kind of important photocatalysis.

中文翻译：

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新型 M0.5Bi2.5Nb2O9 (M=Li, Na, K) 铁电纳米片的高效协同压电/光催化降解

摘要 抑制光生载流子的复合仍然是当今光催化材料面临的重要挑战之一。为此，我们报道了一系列新型铋层状结构铁电体：通过一步水热法制备的 M0.5Bi2.5Nb2O9 (M = Li, Na, K) 纳米片。制备的平均厚度尺寸约为 32 nm (Li0.5Bi2.5Nb2O9)、45 nm (Na0.5Bi2.5Nb2O9)、108 nm (K0.5Bi2.5Nb2O9) 的纳米片对各种高浓度有机染料污染物具有优异的光降解性能20 mg/L [罗丹明 B (RhB)、甲基橙 (MO) 等]。有趣的是，与单独的光照射相比，在超声辅助照射条件下通过极化诱导电荷分离可以进一步提高 RhB 和 MO 的降解速率常数，Na0.5Bi2.5Nb2O9 纳米片增加了约 2.5 倍。这些发现使铋层状铁电材料作为一种重要的光催化材料在废水处理中具有潜在的应用价值。