Abstract

TiO₂ nanoparticles were successfully synthesized by sol-hydrothermal (SH) method using sonochemically activated precursors. Sonochemical activation yields product bearing desirable crystallinity at relatively lower temperature in comparison with conventional SH method. Glycine was used as a mineralizer in the ultrasound activation process which suppress the formation of brookite phase (of TiO₂) observed in the sonochemically activated sample. TiO₂ sample synthesized in presence of Glycine [SA-SH(GLY)] was further modified by coating Ag₂O nanoparticles by sonochemical (SD-Ag) and photochemical (PD–Ag) methods. The deposition by sonochemical method yields product with better crystallinity, high surface area and improved optical properties. Morphological investigations confirm the formation of rounded cube and cube shaped Ag₂O particles in the sonochemical and photochemical methods respectively. Photoactivities of the catalysts were investigated in terms of degradation of methyl orange (MO) dye contaminated aquatic waste. Equilibrium of MO photo-degradation was achieved within about 90 min with removal efficiencies of 99.9, 67.1, and 44.4% for SD-Ag, PD–Ag, and SA-SH-(GLY) samples, respectively at 50 mg/L of MO dye concentration. The high photo-catalytic activity of SD-Ag sample was observed for MO photo-degradation, which is attributed to the improved properties like crystallinity, visible light absorption capacity and higher surface area.

Graphic Abstract

Advance route of sonochemical activation process for synthesis of Ag₂O co-capped TiO₂ nanocomplex for MO photo-degradation

中文翻译：

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声化学活化法合成Ag 2 O包覆的TiO 2纳米粒子增强光催化活性

摘要

利用声化学活化的前体，通过溶胶-水热（SH）方法成功合成了TiO ₂纳米颗粒。与常规SH方法相比，声化学活化在相对较低的温度下产生具有所需结晶度的产物。甘氨酸在超声活化过程中用作矿化剂，可抑制在声化学活化样品中观察到的板钛矿相（TiO ₂）的形成。在甘氨酸[SA-SH（GLY）]存在下合成的TiO ₂样品通过涂覆Ag ₂进一步改性通过声化学（SD-Ag）和光化学（PD-Ag）方法制备O纳米颗粒。通过声化学方法的沉积产生具有更好的结晶度，高表面积和改善的光学性质的产物。形态学研究证实形成了圆形的立方体和立方体形状的Ag ₂O粒子分别在声化学和光化学方法中使用。根据降解甲基橙（MO）染料污染的水生废料研究了催化剂的光活性。在50 mg / L的MO下，SD-Ag，PD-Ag和SA-SH-（GLY）样品的去除效率分别为99.9、67.1和44.4％，在90分钟内达到了MO光降解的平衡。染料浓度。观察到SD-Ag样品对MO光降解具有很高的光催化活性，这归因于诸如结晶度，可见光吸收能力和更大表面积等改进的特性。

图形摘要

声化学活化法合成MO光降解Ag ₂ O共包覆TiO ₂纳米配合物的先进途径