Payan Amir, Fattahi Moslem, Roozbehani Behrooz
Department of Chemical Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran.
J Environ Health Sci Eng. 2018 Apr 13;16(1):41-54. doi: 10.1007/s40201-018-0295-5. eCollection 2018 Jun.
The aim of present work, was to synthesize the titanium nanoparticles (TNPs) and titanium nanotubes (TNTs) through the hydrothermal method with different precursors including the Titanium(IV) isopropoxide (TTIP) and Titanium(IV) bis(ammonium lactato)dihydroxide (TALH).
TiO nanostructures from different titania precursors as heterogeneous photocatalysis via hydrothermal method were synthesized. The as-prepared photocatalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectra, surface area measurements, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The TiO photocatalysts were tested on the degradation of 4-Chlorophenol (4-CP) aqueous solution under UVC irradiation in a fabricated photoreactor.
The effect of operating parameters including the; initial 4-CP concentration (50-150 mg/L), catalyst dosages (0-3 g/L) and solution pH (4-10) on the photocatalytic activity of the prepared catalysts were systematically investigated. The results show that amongst the TiO nanostructures under best conditions (initial 4-CP concentration of 50 mg/L, catalyst dosage of 2 g/L, pH of 4.0, Time of 180 min) TNT-P2 exhibited much higher photocatalytic degradation efficiency (82%) as compared with TNT-P1 (77%), TNP-P2 (51%), and TNP-P1 (48%). Moreover, the mechanism and tentative pathways of 4-CP degradation were explored. Finally, the kinetic study was performed and the Langmuir-Hinshelwood kinetic model was aptly fitted with the experimental data.
The results of the photocatalytic activity measurement demonstrated that one-dimensional TNTs shows enhanced photocatalytic performance as compared to the TNPs, therefore, indicating the beneficial feature of TNTs as a photocatalyst for the degradation of pollutants. Besides, TiO nanostructures prepared from TALH precursor (TNT-P2 82%, TNP-P2 51%) has higher photocatalytic degradation efficiency as compared with TTIP precursors (TNT-P1 77%, TNP-P1 48%).
本研究的目的是通过水热法，使用不同的前驱体，包括异丙醇钛（TTIP）和二氢氧化钛二（乳酸铵）（TALH），合成钛纳米颗粒（TNPs）和钛纳米管（TNTs）。
通过水热法合成了来自不同二氧化钛前驱体的TiO纳米结构，作为多相光催化剂。通过X射线衍射、紫外-可见漫反射光谱、表面积测量、傅里叶变换红外光谱和场发射扫描电子显微镜对所制备的光催化剂进行了表征。在制造的光反应器中，在紫外光C照射下，对TiO光催化剂降解4-氯苯酚（4-CP）水溶液进行了测试。
系统研究了初始4-CP浓度（50-150mg/L）、催化剂用量（0-3g/L）和溶液pH值（4-10）等操作参数对所制备催化剂光催化活性的影响。结果表明，在最佳条件下（初始4-CP浓度为50mg/L、催化剂用量为2g/L、pH值为4.0、时间为180min），TNT-P2的光催化降解效率（82%）比TNT-P1（77%）、TNP-P2（51%）和TNP-P1（48%）高得多。此外，还探索了4-CP降解的机理和初步途径。最后进行了动力学研究，Langmuir-Hinshelwood动力学模型与实验数据拟合良好。
光催化活性测量结果表明，与TNPs相比，一维TNTs表现出增强的光催化性能，因此表明TNTs作为光催化剂降解污染物具有有益特性。此外，由TALH前驱体制备的TiO纳米结构（TNT-P2为82%，TNP-P2为51%）比TTIP前驱体（TNT-P1为77%，TNP-P1为48%）具有更高的光催化降解效率。
