Photocatalytic Activity of Silver-Based Biomimetics Composites

被引:11
作者
Machin, Abniel [1 ]
Soto-Vazquez, Loraine [2 ]
Colon-Cruz, Carla [3 ]
Valentin-Cruz, Carlos A. [3 ]
Claudio-Serrano, Gerardo J. [3 ]
Fontanez, Kenneth [4 ]
Resto, Edgard [2 ]
Petrescu, Florian, I [5 ]
Morant, Carmen [6 ,7 ]
Marquez, Francisco [3 ]
机构
[1] Univ Ana G Mendez, Arecibo Observ, Cupey Campus, San Juan, PR 00926 USA
[2] Univ Puerto Rico, Mat Characterizat Ctr, Mol Sci Res Ctr, San Juan, PR 00926 USA
[3] Univ Ana G Mendez, Nanomat Res Grp, Sch Nat Sci & Technol, Gurabo Campus, Gurabo, PR 00778 USA
[4] Univ Puerto Rico Rio Piedras, Dept Chem, San Juan, PR 00925 USA
[5] Univ Politehn Bucuresti, IFToMM ARoTMM, Bucharest 060042, Romania
[6] Autonomous Univ Madrid, Dept Appl Phys, Madrid 28049, Spain
[7] Inst Ciencia Mat Nicolas Cabrera, Madrid 28049, Spain
基金
美国国家科学基金会;
关键词
photocatalysis; hydrogen production; ciprofloxacin; silver nanoparticles; TiO2; ZnO;
D O I
10.3390/biomimetics6010004
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Different Ag@TiO2 and Ag@ZnO catalysts, with nanowire (NW) structure, were synthesized containing different amounts of silver loading (1, 3, 5, and 10 wt.%) and characterized by FE-SEM, HRTEM, BET, XRD, Raman, XPS, and UV-vis. The photocatalytic activity of the composites was studied by the production of hydrogen via water splitting under UV-vis light and the degradation of the antibiotic ciprofloxacin. The maximum hydrogen production of all the silver-based catalysts was obtained with a silver loading of 10 wt.% under irradiation at 500 nm. Moreover, 10%Ag@TiO(2)NWs was the catalyst with the highest activity in the hydrogen production reaction (1119 mu mol/hg), being 18 times greater than the amount obtained with the pristine TiO2NW catalyst. The most dramatic difference in hydrogen production was obtained with 10%Ag@TiO2-P25, 635 mu mol/hg, being 36 times greater than the amount reported for the unmodified TiO2-P25 (18 mu mol/hg). The enhancement of the catalytic activity is attributed to a synergism between the silver nanoparticles incorporated and the high surface area of the composites. In the case of the degradation of ciprofloxacin, all the silver-based catalysts degraded more than 70% of the antibiotic in 60 min. The catalyst that exhibited the best result was 3%Ag@ZnO commercial, with 99.72% of degradation. The control experiments and stability tests showed that photocatalysis was the route of degradation and the selected silver-based catalysts were stable after seven cycles, with less than 1% loss of efficiency per cycle. These results suggest that the catalysts could be employed in additional cycles without the need to be resynthesized, thus reducing remediation costs.
引用
收藏
页码:1 / 20
页数:20
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