Barakat Nasser A M, Tolba Gehan M K, Khalil Khalil Abdelrazek
Chemical Engineering Department, Faculty of Engineering, Minia University, Minia 61519, Egypt.
Department of Mechanical & Nuclear Engineering, College of Engineering, University of Sharjah, Sharjah 27272, United Arab Emirates.
Polymers (Basel). 2022 Jan 27;14(3):523. doi: 10.3390/polym14030523.
In this study, hydrogen generation was performed by utilizing methylene blue dye as visible-light photosensitizer while the used catalyst is working as a transfer bridge for the electrons to H/H reaction. Silica NPs-incorporated TiO nanofibers, which have a more significant band gap and longer electrons lifetime compared to pristine TiO, were used as a catalyst. The nanofibers were prepared by electrospinning of amorphous SiO NPs/titanium isopropoxide/poly (vinyl acetate)/N, N-dimethylformamide colloid. Physicochemical characterizations confirmed the preparation of well morphology SiO-TiO nanofibers with a bandgap energy of 3.265 eV. Under visible light radiation, hydrogen and oxygen were obtained in good stoichiometric rates (9.5 and 4.7 mL/min/gcat, respectively) without any considerable change in the dye concentration, which proves the successful exploitation of the dye as a photosensitizer. Under UV irradiation, SiO NPs incorporation distinctly enhanced the dye photodegradation, as around 91 and 94% removal efficiency were obtained from TiO nanofibers containing 4 and 6 wt% of the used dopant, respectively, within 60 min.
在本研究中，利用亚甲基蓝染料作为可见光光敏剂进行产氢，同时所使用的催化剂作为电子到H/H反应的转移桥。与原始TiO相比，具有更大带隙和更长电子寿命的二氧化硅纳米颗粒掺入的TiO纳米纤维被用作催化剂。纳米纤维通过静电纺丝非晶态SiO纳米颗粒/异丙醇钛/聚（醋酸乙烯酯）/N，N-二甲基甲酰胺胶体来制备。物理化学表征证实制备出了具有3.265 eV带隙能量的形态良好的SiO-TiO纳米纤维。在可见光辐射下，以良好的化学计量比速率（分别为9.5和4.7 mL/min/gcat）获得了氢气和氧气，染料浓度没有任何显著变化，这证明了该染料作为光敏剂的成功应用。在紫外光照射下，掺入SiO纳米颗粒显著增强了染料的光降解，在60分钟内分别从含有4 wt%和6 wt%所用掺杂剂的TiO纳米纤维中获得了约91%和94%的去除效率。
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