TiO2 ZrO2 Research Articles

Sustainable synthesis of HKUST-1 and its composite by biocompatible ionic liquid for enhancing visible-light photocatalytic performance

Cyhalothrin is lethally toxic to aquatic organisms and has caused adverse effects in the hydrosphere. It is urgent to develop efficient and sustainable material for its removal. High-quality HKUST-1 was rapidly synthesized by cholinium ionic liquids (ILs) in water at room temperature. Yields of HKUST-1 showed obviously positive correlation with Hammett values of ILs. When applying CuCl2 as a copper salt, the yield of products was reached up to 95.5%, which was much higher than that of reported research. The reaction could be readily scalable with high space-time yield (242512 kg m−3 d−1). Additionally, ZrO2@HKUST-1 composite was successfully synthesized through a sol-gel method without complicated heat treatment. The whole process eliminates the use of environmentally unfriendly solvents/amines and enables the production of material at a reasonable cost. The obtained HKUST-1 and ZrO2@HKUST-1 possessed large pore volume (0.88–0.95 cm3 g−1) and high surface area (1152–1484 m2 g−1). The composite material was used for the adsorption/degradation of cyhalothrin and showed superior photocatalytic activity under moderate visible light, as compared to pure ZrO2, HKUST-1 and commercial TiO2 samples. ZrO2@HKUST-1 displayed the high cyhalothrin adsorption capacity of 333 mg g−1 through π−π stacking, which facilitated more target molecules to contact the composite in a short time. ZrO2 incorporating with HKUST-1 protected ZrO2 nanoparticles from rapid agglomeration, thus narrowed the band gap of the composite. Moreover, the formation of a junction between HKUST-1 and ZrO2 effectively reduced the recombination of photoinduced carriers in composite. Therefore, the novel ZrO2@HKUST-1 composite can be used as a sustainable efficient heterogeneous photocatalyst for the removal of organic pollutant.

Role of Metal/Oxide Interfaces in Enhancing the Local Oxide Reducibility

Oxide reducibility is an important property in catalysis by metal-oxides. The reducibility of an oxide can be substantially modified when an interface is created between the oxide and a metal. Here we discuss two types of interfaces. One consists of gold nanoparticles deposited on anatase TiO2 or tetragonal ZrO2 (101) surfaces; these are traditional direct catalysts (metal deposited on an oxide). The second example consists of a metal support, Pt or a Pt3Zr alloy, where a ZrO2 nanofilm is deposited; this is representative of an inverse catalyst (oxide on metal). We designed models of these systems and analyzed by means of first principle calculations a key descriptor of the oxide reducibility, the cost of formation of an oxygen vacancy. We show that this cost is dramatically reduced when the oxide is interfaced with the metal. The effect on catalytic reactions is analyzed by computing the energy profiles for the CO oxidation reaction on Au/TiO2 and Au/ZrO2 model catalysts. Despite the very different nature of the two oxide supports, reducible for TiO2 and non-reducible for ZrO2, the same Au-assisted Mars–van Krevelen mechanism is found, with similar barriers.

Experimental Investigation of Phase Equilibria in the ZrO2–TiO2–MgO System

Phase equilibria in the ZrO2–TiO2–MgO system are studied experimentally using X‐ray diffraction (XRD), scanning electron microscopy combined with dispersive X‐ray spectrometry (SEM/EDX), and differential thermal analysis (DTA). Based on the obtained experimental data, isothermal sections of the ZrO2–TiO2–MgO system at temperatures 1530, 1680, and 1880 K are established. Wide extension of stability of Zr1‐xMgxO2‐x phase with fluorite structure (C ZrO2) into ternary system is revealed. Very limited solubility of MgO is found in β‐(ZrxTi1‐x)2O4 and tetragonal (Zr1‐xTix)O2 phase (T ZrO2), while more substantial solubility of ZrO2 is found in the intermediate compounds of the TiO2–MgO system (Mg2TiO4, MgTiO3, and MgTi2O5). Low temperature ternary compound similar to δ‐phase Y4Zr3O12 is revealed at 1530 K. Differential thermal analysis indicated that this δ‐phase is stable up to 1664 K. Temperatures and compositions of three eutectic reactions are experimentally measured by DTA and ex situ analysis of the sample microstructures after melting using SEM/EDX.

CO 2 hydrogenation to methanol over CuO–ZnO–TiO2–ZrO2: a comparison of catalysts prepared by sol–gel, solid-state reaction and solution-combustion

Three CuO–ZnO–TiO2–ZrO2 catalysts with the same composition were prepared through sol–gel, solid-state reaction, and solution-combustion methods and characterized by X-ray diffraction (XRD), N2 adsorption, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction with H2 (H2-TPR), reactive N2O adsorption, and adsorption of H2 and CO2 followed by temperature-programmed desorption (H2-TPD, CO2-TPD) techniques. Their catalytic performances for CO2 hydrogenation to methanol were tested in a fixed-bed reactor under the conditions of 200–280 °C, 3 MPa, and SV = 2400 mL gcat−1 h−1. The results indicated that the texture, structure, reducibility, and adsorption capacity for reactants of the CuO–ZnO–TiO2–ZrO2 catalyst were affected noticeably by preparation methods and the catalyst prepared by sol–gel method exhibited the highest CO2 conversion and methanol selectivity, which reached to 17.0% and 44.0%, respectively. The highest activity of the CuO–ZnO–TiO2–ZrO2 catalyst prepared by sol–gel method was attributed to the largest metallic Cu surface area and adsorption capacity for H2.

Matrices for Isolation of Actinide Wastes in a Deep Well Repository

Radioactive nuclear waste containing long-lived actinides (Np, Pu, Am, and Cm) is proposed to be placed in well repositories with a depth of up to 5 km. The optimum form of such wastes is crystalline phases that are capacious in relation to radionuclides and stable in mineralized groundwater (brines) heated due to heat generation in the waste and due to the geothermal gradient. In order to find possible phases, we have studied samples of the Nd–Ti–Zr–O system, where Nd3+ acts as an imitator of the rare-earth-actinide fraction of highly radioactive wastes of reprocessed nuclear fuel. The samples were obtained by induction melting in a cold crucible with subsequent melt crystallization. It has been concluded that the Nd2–x(Ti,Zr)2O7–1.5х and Nd4Ti9O24 phases are promising as potential matrices for these wastes. The structure of NdO1.5–TiO2–ZrO2 system at a high temperature has been revealed.

Wear Behavior of Plasma Spray Deposited and Post Heat-Treated Hydroxyapatite (HA)-Based Composite Coating on Titanium Alloy (Ti-6Al-4V) Substrate

The present study concerns a detailed evaluation of wear resistance property of plasma spray deposited composite hydroxyapatite (HA)-based (HA-50 wt pct TiO2 and HA-10 wt pct ZrO2) bioactive coatings developed on Ti-6Al-4V substrate and studying the effect of heat treatment on it. Heat treatment of plasma spray deposited samples has been carried out at 650 °C for 2 hours (for HA-50 wt pct TiO2 coating) and at 750 °C for 2 hours (for HA-10 wt pct ZrO2 coating). There is significant deterioration in wear resistance for HA-50 wt pctTiO2 coating and a marginal deterioration in wear resistance for HA-10 wt pct ZrO2 coating in as-sprayed state (as compared to as-received Ti-6Al-4V) which is, however, improved after heat treatment. The coefficient of friction is marginally increased for both HA-50 wt pct TiO2 and HA-10 wt pct ZrO2 coatings in as-sprayed condition as compared to Ti-6Al-4V substrate. However, coefficient of friction is decreased for both HA-50 wt pct TiO2 and HA-10 wt pct ZrO2 coatings after heat-treated condition as compared to Ti-6Al-4V substrate. The maximum improvement in wear resistance property is, however, observed for HA-10 wt pct ZrO2 sample after heat treatment. The mechanism of wear has been investigated.

The roles of phosphate and tungstate species in surface acidities of TiO2-ZrO2 binary oxides – A comparison study

Porous tungstated and phosphated TiO2-ZrO2 (TZ) binary oxides with high and strong acidity were successfully prepared by means of sol-gel or impregnation approaches. In addition, the influences of the two types of modifiers on the microstructures and acidity were systematically examined, compared, and clarified. The TZ oxide derived from a surfactant-templating method exhibited a high surface area of 195 m2/g with a pore size of 6.3 nm. Moreover, it had a high acidity of 859 µmol/g with a density of 4.4 µmol/nm2 because of defective surface. Phosphation significantly increased the acidity to 1547 µmol/g and showed the highest acid density of 6.7 µmol/nm2 at a surface P density of 22.7P/nm2. On the other hand, tungstated compounds just showed the highest acidity of 972 µmol/g and the highest acid density of 4.8 µmol/nm2 at 4.7 W/nm2. Compared to tungstate species, phosphate anions are more capable of promoting the acidity because they are able to distort the host network and inhibit elemental rearrangement. While Lewis acidity prevailed in the tungstated compounds, Brønsted acidity was dominant in the phosphated oxides. The WO and POH groups were responsible for strong acidity in the modified compounds. Phosphated compounds formed strong Brønsted acid sites on the POH groups with a particular strength, and tungstation produced Lewis acid sites with a continuous strength on the metal ions adjacent to the tungstate moieties. Cyclic NH3 adsorption-desorption processes revealed that the active sites for NH3 adsorption were stable in both the tungstate and phosphate modified compounds, revealing that these solid acids are promising as the adsorbents for removal of base gases.

Fabrication of TiC–ZrC–Co composites with refined microstructure using ultrafine TiC–ZrC mixture powders

Ultrafine TiC–ZrC mixture powders with various Ti/Zr molar ratios (9:1, 8:2, 7:3, and 6:4) were synthesized by carbothermal reduction of high–energy milled TiO2–ZrO2–C. ZrC was found to be insoluble in the TiC lattice at 1400–1500 °C; as a result, carbothermal reduction of TiO2–ZrO2–C mixtures led to the formation of the TiC–ZrC mixture powders rather than the (Ti,Zr)C solid solution. TiC–ZrC–Co composites prepared using the TiC–ZrC mixture powders exhibited a refined microstructure, due to the inhibition of the coalescence of TiC grains by ZrC grains distributed in the TiC–ZrC mixture powders. In other words, the ZrC particles distributed in the mixture powders inhibited the coalescence of TiC grains during liquid–phase sintering, resulting in the formation of TiC–ZrC–Co composites with refined microstructure. The refined microstructure of these composites favorably influenced their properties: in particular, the experimental measurements highlighted a significant improvement in the mechanical properties (HV = 14.8–16.0 GPa, KIC = 7.2–7.6 MPa m1/2) of the composites prepared from the ultrafine TiC–ZrC mixture powders, compared with those (HV = 11.1–13.3 GPa, KIC = 5.7–6.3 MPa m1/2) of conventional TiC–ZrC–Co composites.

Fabrication of carbon fiber supported zirconium–titanium nanocomposites for efficient photocatalytic decolorization of Orange II dye under visible light irradiation

A series of carbon fiber based ZrO2–TiO2 (Zr/Ti/CF) nanocomposites were synthesized with carbon fiber loadings from 3 to 10 wt% by the solvothermal method. For comparison, Zr/Ti, Ti/CF and Zr/CF catalysts were also synthesized. The resultant samples were characterized by SEM, XPS, XRD, FT-IR, and UV–Vis spectroscopy. XRD results revealed that the catalysts were having anatase TiO2 with excellent crystallinity. SEM studies show that the surface of Zr/Ti/CF/10 catalyst has round-shaped grains with dimensions in the range of 16–20 nm. Under UV-A and visible light irradiation, Zr/Ti/CF catalyst exhibited excellent photocatalytic performance for Orange II degradation when compared with Zr/Ti, Zr/CF and Ti/CF. The enhancing efficiency was attributed to the synergetic effect of adsorption–photocatalysis and to the reduction of the band gap energy.

Binary oxide ceramics for enhanced phenols degradation under simulated Solar light

AbstractSolvothermal synthesis of ZrO2–TiO2 binary oxides and pure counterparts at 150°C in water/isopropanol media is presented. Titanium (IV) isopropoxide and zirconium (IV) propoxide were used as precursors. XRD and TEM techniques were used for structural and morphological characterization of obtained samples. XPS spectra of mixed oxide samples were compared in order to correlate composition of samples with surface properties and presence of defects. Relative positions of defect states within band‐gaps of semiconductors were estimated from UCPL spectra. UV‐Vis DRS spectra revealed that both pure oxides experienced red shift of absorption thresholds compared to reference data. Photocatalytic activities of all samples were probed under simulated Solar light on three model compounds: phenol, 4‐chlorophenol (4‐CP) and 2, 4, 6‐trichlorphenol (TCP). Pure TiO2 showed the highest photocatalytic activity in the case of phenol. However, pure ZrO2 and binary oxides showed higher photoactivity in degradation of 4‐CP and TCP. The activity of wide band‐gap semiconductors under simulated Solar light in photodegradation of phenol and its derivatives is most probably the consequence of formation of charge transfer complexes between pollutant molecules and semiconductors surface.

Effective excitons separation on graphene supported ZrO2[sbnd]TiO2 heterojunction for enhanced H2 production under solar light

A novel photocatalyst comprises of ZrO2TiO2 immobilized on reduced graphene oxide (rGO) – a ternary heterojunction (ZrO2TiO2/rGO) was synthesized by using facile chemical method. The nanocomposite was prepared with a strategy to achieve better utilization of excitons for catalytic reactions by channelizing from metal oxide surfaces to rGO support. TEM and XRD analysis results revealed the heterojunction formed between ZrO2 and single crystalline anatase TiO2. The mesoporous structure of ZrO2TiO2 was confirmed using BET analysis. The red shift in absorption edge position of ZrO2TiO2/rGO photocatalyst was characterized by using diffuse reflectance UV–Visible spectra. ZrO2TiO2/rGO showed greater interfacial charge transfer efficiency than ZrO2TiO2, which was evidenced by well suppressed PL intensity and high photocurrent of ZrO2TiO2/rGO. The suitable band gap of 1.0 wt% ZrO2TiO2/rGO facilitated the utilization of solar light in a wide range by responding to the light of energy equal to as well as greater than 2.95 eV by the additional formation of excited high-energy electrons (HEEs). ZrO2TiO2/rGO showed the enhanced H2 production than TiO2/rGO, which revealed the role of ZrO2 for the effective charge separation at the heterojunction and the solar light response. The optimum loading of 1.0 wt% of ZrO2 and rGO on TiO2 showed the highest photocatalytic performance (7773 μmolh−1gcat−1) for hydrogen (H2) production under direct solar light irradiation.

Experimental investigation of phase relations and thermodynamic properties in the ZrO2–TiO2 system

AbstractPhase relations in the ZrO2–TiO2 system were studied experimentally using X‐ray diffraction (XRD), scanning electron microscopy combined with dispersive X‐ray spectrometry (SEM/EDX) and differential thermal analysis (DTA). The homogeneity ranges of ZrO2 and TiO2, as well as high temperature disordered β‐(ZrxTi1−x)2O4 compound were defined in the temperature range of 1700‐2040 K. Temperature and composition of eutectic reaction were measured. The standard enthalpy of formation of the β‐ZrTiO4 compound was obtained using high‐temperature oxide‐melt solution calorimetry. High temperature heat capacity measurement for the β‐ZrTiO4 compound was performed in the temperature range from 250 K to 1200 K. Thermodynamic description of ZrO2–TiO2 system has been derived based on obtained experimental results and data from literature.

Catalytic cracking of n-decane over NiO–MoO3 modified Pt/ZrO2–TiO2–Al2O3 catalyst with different Al2O3 ratios

A series of ZrO2–TiO2–Al2O3 composite oxides with different Al2O3 ratios were prepared by coprecipitation method and used as the supports of Pt/NiO–MoO3/ZrO2–TiO2–Al2O3 catalysts. Catalytic activities for n-decane cracking over these catalysts were evaluated under high temperature and high pressure conditions. Physicochemical characteristics of as-prepared catalysts were detected by using automatic adsorption instrument, X-ray diffractometer, temperature programmed reduction, and temperature programmed desorption techniques to characterize the catalysts and supports. The results indicated that the catalyst which contained 60 wt % Al2O3 had the largest surface area and pore volume (152.7 m2/g and 0.39 mL/g, respectively), and also it possessed strongest medium and strong acidity as well as medium acidic density. Moreover, the catalyst with 60 wt % Al2O3 exhibited better cracking performances compared with the others. The gas yields over Cat3 were 1.5 and 1.2 folds higher than that obtained from thermal cracking at 650 and 700°C, respectively. In addition, the heat sinks were improved 0.27 MJ/kg and 0.25 MJ/kg at 650 and 750°C, respectively.

The Effect of Normal Force on Tribocorrosion Behaviour of Ti-10Zr Alloy and Porous TiO2-ZrO2 Thin Film Electrochemical Formed

The tribocorrosion behaviour of Ti-10Zr alloy and porous TiO2–ZrO2 thin film electrochemical formed on Ti-10Zr alloy was evaluated in Fusayama-Mayer artificial saliva solution. Tribocorrosion experiments were performed using a unidirectional pin-on-disc experimental set-up which was mechanically and electrochemically instrumented, under various solicitation conditions. The effect of applied normal force on tribocorrosion performance of the tested materials was determined. Open circuit potential (OCP) measurements performed before, during and after sliding tests were applied in order to determine the tribocorrosion degradation. The applied normal force was found to greatly affect the potential during tribocorrosion experiments, an increase in the normal force inducing a decrease in potential accelerating the depassivation of the materials studied. The results show a decrease in friction coefficient with gradually increasing the normal load. It was proved that the porous TiO2–ZrO2 thin film electrochemical formed on Ti-10Zr alloy lead to an improvement of tribocorrosion resistance compared to non-anodized Ti-10Zr alloy intended for biomedical applications.

High quality factor microwave dielectric ceramics in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system

AbstractNovel high quality factor microwave dielectric ceramics (1−x)ZrTiO4−x(Mg1/3Nb2/3)TiO4 (0.325≤x≤0.4) and (ZrTi)1−y(Mg1/3Nb2/3)yO4 (0.2≤y≤0.5) with the addition of 0.5 wt% MnCO3 in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system were prepared, using solid‐state reaction method. The relationship between the structure and microwave dielectric properties of the ceramics was studied. The XRD patterns of the sintered samples reveal the main phase belonged to α‐PbO2‐type structure. Raman spectroscopy and infrared reflectivity (IR) spectra were employed to evaluate phonon modes of ceramics. The 0.65ZrTiO4−0.35(Mg1/3Nb2/3)TiO4−0.5 wt% MnCO3 ceramic can be well densified at 1240°C for 2 hours and exhibits good microwave dielectric properties with a relative permittivity (εr) of 42.5, a quality factor (Q×f) value of 43 520 GHz (at 5.9 Ghz) and temperature coefficient of resonant frequency (τf) value of −5ppm/°C. Furthermore, the (ZrTi)0.7(Mg1/3Nb2/3)0.3O4−0.5 wt% MnCO3 ceramic sintered at 1260°C for 2 hours possesses a εr of 31.8, a Q×f value of 35 640 GHz (at 6.3 GHz) and a near zero τf value of −5.9 ppm/°C. The results demonstrated that the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system with excellent properties was a promising material for microwave electronic device applications.

Performance of Pt/ZrO2–TiO2–Al2O3 and coke deposition during methylcyclohexane catalytic cracking

Three groups of ZrO2–TiO2–Al2O3 catalysts with and without Pt addition were prepared to comparatively investigate the coke performance during pyrolysis of supercritical methylcyclohexane at 650°C and 4.0MPa. From the data of gas chromatography-mass spectrometer, it was observed that the contents of alkenes in liquid products over Pt-loaded catalysts have higher values than those on pure supports. But for the aromatics, e.g., benzene and toluene, the yields over Pt-loaded samples are obviously less than those on pure supports. It revealed that the addition of Pt to the metal oxides supports prevented the formation of aromatics. With the characterization of XPS and TPO, the coke formed over pure supports was more ordered with a higher dehydrogenation extent than those produced on the Pt-loaded samples. According to our coke formation model, the results of product distribution could be owing to the Pt-loaded catalysts, which restrained the generation and polymerization of coke intermediates. PT3 obtained the best coke inhibition effect, which attributes to the reduced polymerization rate by Pt effect and pore diffusion effect. The acid and pore property have an influence on both the coke amount and the nature of coke, moreover, less amount of coke and easier-oxidized coke were obtained with Pt addition.

Effect of annealing on the structural, optical, electrical and photocatalytic activity of ZrO2–TiO2 nanocomposite thin films prepared by sol–gel dip coating technique

ZrO2–TiO2 nanocomposite thin films were deposited onto quartz substrate by sol–gel dip coating technique. The structural, morphological, optical, electrical and photocatalytic properties of the films were studied for different annealing temperatures (500, 800 and 1200 °C). X-ray diffraction pattern of films annealed at 500 °C showed amorphous nature. Increase in crystallinity was observed in the films annealed at higher temperature. Films annealed at higher temperature showed the formation of orthorhombic ZrTiO4 phase. Field emission scanning electron microscopy (FESEM) revealed crack free surface and surface roughness was found to increase with increase in annealing temperature. Energy dispersive X-ray analysis confirmed the presence of Zr, Ti and O in these films. Band gap of the films decreased from 3.93 to 3.50 eV with increase in annealing temperature. Photoluminescence spectra of the films exhibited emission peaks in both UV and visible region of the electromagnetic spectra. The conductivity of the films increased with increase in annealing temperature. Photocatalytic activity of these films evaluated by monitoring the degradation of methylene blue solution increased with increase in annealing temperature.

Charge transfer processes involved in photocatalytic hydrogen production over CuO/ZrO2–TiO2 materials

Co-catalysts are widely employed to boost the photocatalytic hydrogen production; particularly, CuO has shown a remarkable improvement in the reaction rate. However, the impact of CuO on the charge transfer process during photocatalytic water reduction has been barely investigated. In this work, ZrO2–TiO2 (ZT) heterojunctions (5 mol% ZrO2) have been obtained by means of the sol–gel method. Subsequently, copper nitrate impregnations are prepared by an incipient wetness impregnation method to get 0.5, 1, 3 and 5 wt% CuO loadings. A maximum in the photocatalytic activity is observed for the material containing 1 wt% CuO, followed by a drastic drop in the hydrogen generation rate. Electrochemical characterization shows that the charge-transfer resistance controls the photocatalytic experiments together with the additional interfacial resistance. The maximum photocatalytic activity is then given by a compromise between these two parameters. A further increase of the additional resistance, directly proportional to the CuO loading, reduces drastically the photocatalytic behavior most likely due to the electron trapping at the ZT–CuO interface.

Synthesis and characterization of hollow ZrO2–TiO2/Au spheres as a highly thermal stability nanocatalyst

A novel binary-metal-oxide-coated hollow microspheres-titanium dioxide-zirconium dioxide-coated Au nanocatalyst was prepared via a facile hydrothermal synthesis method. SEM, TEM, EDX, FTIR, XRD, UV–vis and XPS analyses were employed to characterize the composition, structure, and morphology of ZrO2–TiO2 hollow spheres. The size of Au nanoparticles was found to be 3–5nm in diameter before being immobilized on the aforementioned mesoporous ZrO2–TiO2 layer and used as catalysts in the reduction of 4-nitrophenol to 4-aminophenol by NaBH4. Compared with TiO2/Au and ZrO2/Au, ZrO2–TiO2/Au NPs showed a higher catalytic activity because of due to mixed oxide synergistic effect. Besides, the sample gets the highest thermal stability and reactivity at 550°C, after calcining the hollow ZT/Au NPs at 550°C, 300°C and room temperature, respectively. Finally, a possible reaction mechanism was also proposed to explain the reduction of 4-nitrophenol to 4-aminophenol over ZrO2–TiO2/Au catalyst.

Antimicrobial property, cytocompatibility and corrosion resistance of Zn-doped ZrO2/TiO2 coatings on Ti6Al4V implants

Zn-doped ZrO2/TiO2 porous coatings (Zn-ZrO2/TiO2) were prepared on the surface of titanium alloy (Ti6Al4V) by a hybrid approach of magnetron sputtering and micro-arc oxidation (MAO). The microstructures, phase constituents and elemental states of the coating were investigated by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results demonstrate that the Zn-ZrO2/TiO2 coatings are porous and its thickness is approximately 13μm. The major phases in the oxidation coating are tetragonal ZrO2 (t-ZrO2), cubic ZrO2 (c-ZrO2) and rutile TiO2. XPS result reveals that Zn exists as ZnO in the Zn-ZrO2/TiO2 coatings. The biological experiments indicate that Zn-ZrO2/TiO2 coatings exhibit not only excellent antibacterial property against Gram-positive Staphylococcus aureus (S. aureus), but also favorable cytocompatibility. In addition, the corrosion resistance of the coating is also appreciably improved in the simulated body fluids (SBF), which can ensure better biocompatibility in body fluids.