Improvement Of Titanium Dioxide Nanotube Array And Photoelectric Detoxification Performance Of Antibiotics And Cr(VI)

With the development of human society,the problem of environmental pollution has become more and more serious.Human beings are facing the unprecedented environmental pollution and energy shortage.However,with the rise of new nanomaterials in recent decades,human beings have been able to protect the environment and utilize resources with nanotechnology.Because the semiconductor catalysts are non-toxic,environment-friendly,and highly photoactive,they can be applied in dealing with wastewater and contaminated water.Based on titanium dioxide nanotubes?TiO₂NTS?,Pd/TiO₂NTS and MoS₂/TiO₂NTS were successfully prepared with increased the visible light absorption and improved photoelectrocatalytic properties in comparison with unmodified TiO₂ nanotubes.The research results are listed as follows:?1?Ordered titanium dioxide nanotube arrays?TiO₂NTS?were grown on flexible Ti wire by anodization,which were calcined at high temperature and then used as substrate.Pd nanopartilces were deposited on the as-prepared TiO₂NTS with multi-potential step method in a three-electrode system.The loading content of Pd can optimized by controlling the deposition sequences.The antibiotic dehalogenation performance of the materials was compared and discussed,and the optimum deposition amount was summarized.The resulting Pd/TiO₂NTS were characterized by SEM,TEM,XPS,EDS.And EIS and DRS were empoloyed to determine the photoelectric properties of Pd/TiO₂NTS.It is found that Pd/TiO₂NTS can be used as working electrodes and photocatalysts simultaneously due to its integrity,which shows excellent degradation performance for florfenicol.The plasma resoance effect of Pd nanoparticles can enhance the light harvest of TiO₂NTS.Furthermore,there is a Schottky barrier formed between Pd and TiO₂,which accelerates the separation of electrons-hole pairs.Benefited by the high surface area of Pd/TiO₂NTS,H₂O molecules adsorbed there can be converted into hydroxyl radicals and highly active H*in the presence of Pd.During the photocatalytic degradation of florfenicol,the activated H*can replace the-Cl and detoxify florfenicol.?2?MoS₂ nanosheets modified TiO₂NTS were fabricated by hydrothermal strategy wit ammonium molybdate(H₂₄Mo₇N₆O₂₄�4H₂O)and thiourea?CH₄N₂S?as the precursors.Molar ratio beween H₂₄Mo₇N₆O₂₄�4H₂O and CH₄N₂S was controlled to changing the morphology of MoS₂ and the final properties of MoS₂/TiO₂NTS.Based on related characterization results,we define the as-prepared photocatalysts prepared under two ratios of H₂₄Mo₇N₆O₂₄�4H₂O and CH₄N₂S as 1TMoS₂/TiO₂NTS and2HMoS₂/TiO₂NTS,respectively.1TMoS₂ nanosheets surpass 2HMoS₂ in helping TiO₂with accelerated electron transfer rate and low recombination of electron-hole pairs.The1TMoS₂/TiO₂NTSexhibitsgoodphotoelectrocatalyticperformancein photocatalytic reduction of Cr?VI?.