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Vertically Aligned ZnO@ZnS Nanorod Chip with Improved Photocatalytic Activity for Antibiotics Degradation
journal contribution
posted on 2018-01-09, 00:00 authored by Bo Ji, Jixiang Zhang, Cheng Zhang, Nian Li, Tingting Zhao, Fa Chen, Lihe Hu, Shudong Zhang, Zhenyang WangThe
photocatalytic degradation for environmentally hazardous substances
has been widely explored with the use of various photocatalysts and
techniques. It still remains a challenge to achieve efficient degradation
and removal of residual antibiotics in the water environment. Here,
we report an improved photocatalytic activity chip for degradation
of antibiotic tetracycline hydrochloride by perpendicular ZnS-coated
ZnO nanorod arrays (ZnO@ZnS NAs). The enhanced photocatalytic activity
contributed to the polycrystalline ZnS shell’s effective inhibition
of the recombination of photogenerated electron–hole pairs.
Meanwhile, vertically aligned ZnO@ZnS nanorod arrays can increase
the light harvesting ability by enhancing scattering of light among
ZnO@ZnS NAs. On the basis of these findings, an improved photocatalytic
activity ZnO@ZnS NA chip has been fabricated by growth of ZnO NAs
on a piece of silicon wafer and further sulfurization. More importantly,
ZnO@ZnS NA chips have been utilized to construct a ladderlike device,
purifying antibiotics wastewater in one step, to effectively degrade
tetracycline hydrochloride with enhanced photocatalytic efficiency
in flowing contaminated water. In addition, the ZnO@ZnS NA device
exhibited excellent recyclability in multiple repeated cycles. The
ZnO@ZnS NA chip provided a convenient and fast strategy for removal
of antibiotics and pharmaceutical residues in wastewater.
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Antibiotics Degradationsilicon waferphotocatalytic efficiencyZnS-coated ZnO nanorod arraysphotocatalytic degradationtetracycline hydrochloridewater environmentPhotocatalytic Activityphotocatalytic activity chipantibiotic tetracycline hydrochlorideZnO NAsladderlike deviceantibiotics wastewaterphotocatalytic activitylight harvesting ability
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