In the present work, α-bismuth (III) oxide (α-Bi₂O₃) photocatalysts with a porous and nanosheet structure were prepared by using the biomimetic-synthesis-assisted hydrothermal method. l-Arginine (C₆H₁₄N₄O₂) was used as the biomimetic template, and the pH value range of the precursor solution was 3–12. The as-obtained samples were characterized by X-ray diffraction, field-emission scanning electron microscopy and ultraviolet–visible diffuse reflectance spectroscopy. The photocatalytic activity of photocatalysts was evaluated by using rhodamine B (RhB; C₂₈H₃₁ClN₂O₃), tetracycline hydrochloride (TC-HCl; C₂₂H₂₄N₂O₈·HCl) and methyl orange (MO) as the targeted degradants under visible light irradiation. The results show that α-bismuth (III) oxide exhibits a high photocatalytic activity when the pH value of the precursor is 3 and the l-arginine content is 0.03 mol/l. Under the co-catalysis of hydrogen peroxide (H₂O₂), the degradation efficiencies of RhB, TC-HCl and MO are 75.3, 68.1 and 63.8%, respectively. The degradation rate of α-bismuth (III) oxide as prepared by using l-arginine for RhB degradation is about 2·09 times faster than that of template-free α-bismuth (III) oxide. The high photocatalytic activity is mainly attributed to the porous structure and high visible light response range of the α-bismuth (III) oxide photocatalyst.

中文翻译：

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高性能α-Bi2O3光催化剂的制备及其光催化活性

在目前的工作，α -铋（III）氧化物（α-Bi系₂ ö ₃）具有多孔和纳米片结构的光催化剂，通过使用该仿生合成辅助水热法来制备。使用1-精氨酸（C ₆ H ₁₄ N ₄ O ₂）作为仿生模板，前体溶液的pH值范围为3-12。所获得的样品通过X射线衍射，场发射扫描电子显微镜和紫外可见漫反射光谱进行表征。使用罗丹明B（RhB; C ₂₈ H ₃₁ ClN ₂ O ₃评估光催化剂的光催化活性），四环素盐酸盐（TC-HCl; C ₂₂ H ₂₄ N ₂ O ₈ ·HCl）和甲基橙（MO）作为目标降解物在可见光照射下。结果表明，当前体的pH值为3且1-精氨酸含量为0.03mol / l时，α-铋（III）氧化物表现出高的光催化活性。在过氧化氢（H ₂ O ₂）的共催化下，RhB，TC-HCl和MO的降解效率分别为75.3、68.1和63.8％。通过使用l制备的α-铋（III）氧化物的降解率用于精制RhB的-精氨酸比不含模板的α-铋（III）氧化物快约2·09倍。高的光催化活性主要归因于α-铋（III）氧化物光催化剂的多孔结构和高可见光响应范围。