SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Ye Wang,Zhengxuan Hu,Guolong Wu,Xiaonan Zhang,Yanyi Yin,Lin Li,Jianhua Yao
In this study, laser-assisted micro-arc oxidation (LMAO) processing was carried out on Ti6Al4V alloy under laser powers of 30, 45, and 60 W, and the influence of the laser power on the microstructure and wear resistance of the coating was further investigated. The breakdown voltage and termination voltages of LMAO processing decrease gradually as the laser power increases. At the same time, micro-discharges increase in quantity. Within the suitable laser power range (30–45 W), the obtained coating continuously enhances uniformity, thickness, and density with rising power, contributing to higher hardness and adhesion strength . However, raising laser power to 60 W will damage the obtained coating due to the violent micro-discharges, which generate interconnected larger pores in the local area. Laser power also affects the coating's reaction process and phase transition. More electrolyte ions dope into the coating as a consequence of increasing laser power. The Si concentration of the LMAO-45 coating is the highest, whereas that of the LMAO-60 coating comparatively reduces due to localized coating detachment. Moreover, enhancing laser power is more conducive to forming SiO 2 and rutile-TiO 2 phases. Compared with the traditional MAO or other LMAO coatings, the LMAO-45 coating significantly improves wear protection, evidenced by the lowest COF value , the minimum wear rate, and the least peeling during the wear test . Low porosity, surface roughness , high thickness, and increased incorporation of the SiO 2 phase are responsible for the same. However, under 60 W of laser irradiation , the wear resistance of the resultant LMAO coating decreased due to the formation of local damaged areas.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Yunpeng Liu,Yuhang Li,Feng Peng,Yuan Lin,Siyuan Yang,Shengsen Zhang,Hongjuan Wang,Yonghai Cao,Hao Yu
Recently, MoS 2 as an efficient co-catalyst has attracted much attention for photocatalytic water splitting. MoS 2 has two polymorphs: semiconducting phase (2H) and metallic phase (1T). The 2H- and 1T- MoS 2 show different reaction mechanism in photocatalytic H 2 evolution. However, so far, very few experiments have clearly evidenced the electron transfer process between TiO 2 and mixed phase MoS 2 . This study for the first time has reported a simple hydrothermal synthesis method to prepare mixed phase few-layer MoS 2 nanosheets coated on TiO 2 nanorod arrays (MoS 2 @TiO 2 ) with a conductive fluorine-doped tin oxide (FTO) as a substrate. The structure of mixed phase MoS 2 was characterized carefully. The designed MoS 2 @TiO 2 exhibits two times higher activity than Pt@TiO 2 for photocatalytic H 2 evolution. The reliable conclusion that the photo-generated electrons from TiO 2 to MoS 2 nanosheets has clearly been evidenced by photoelectrochemical analyses and in-situ KPFM experiments, and the mixed phase MoS 2 here is a co-catalyst such like Pt rather than as a semiconductor. This study not only presents a series of solid experimental evidences to verify the electrons transfer process and photocatalytic mechanism, but also provides a new method in substituting MoS 2 for noble metal Pt as co-catalyst in high-efficiency photocatalytic water splitting into hydrogen.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zheng Kong,Lun Lu,Chao Zhu,Junjie Xu,Qile Fang,Renlan Liu,Yi Shen
PFOA has caused enormous environmental risks with recalcitrance, toxicity, and bioaccumulation, while the degradation of PFOA is still a challenging topic related to the high energy of C F bonds. However, the conventional methods such as biological oxidation, electrochemical oxidation and membrane separation have their own drawbacks. Actually, adsorption-photocatalysis is considered a potential treatment due to effectiveness and thoroughness. Instead of preparing the composite material by adding TiO 2 , the method to in-situ grow TiO 2 in the MOF (MIL-125(Ti)) was carried out, which achieved narrowed band gap and improved the photoresponse ability, simultaneously. Furthermore, the surface F-functionalized MOF provided more available special adsorption sites for PFOA enrichment. Linked fluorine groups not only improved the adsorption capacity (185.151 μmol/g) but also enhanced the photocatalytic rate (1.221 E −4 /s) by altering the electronic density of VB and CB. The constructed F-TiO 2 @MIL-125 stepwise degraded PFOA through a dominant ·OH attack pathway and maintained the oxidize ability of h + to PFOA. As a bifunctional material for adsorption and photocatalysis , F-TiO 2 @MIL-125 was able to be applied in various water environments repeatedly, which has unlimited environmental application potential.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Mingmei Ding,Wang Ao,Hang Xu,Wei Chen,Lin Tao,Zhen Shen,Huihong Liu,Chunhui Lu,Zongli Xie
Photocatalysis and peroxymonosulfate (PMS) based advanced oxidation processes (AOP) are emerging technology for the degradation of refractory organic pollutant in the field of water treatment . Here we report a novel CoO@TiO 2 /MXene (CTM) hybrid through a facile sonication-hydrothermal method for efficient degradation of phenol via an integrated PMS activation-photocatalysis process. Benefiting from the proper position and superior suitability of the band structure, a dual interfacial charge transport channel was constructed, boosting the separation of photo-generated charge carriers and generating sufficient potential difference for redox reaction. Accordingly, the CTM hybrid not only possessed the outstanding photocatalytic activity but also dramatically accelerated PMS activation to generate considerable reactive radicals. As a result, over 96% phenol degradation was achieved in the 10% CTM/PMS/Vis system within 15 min. The radical quenching test and EPR analysis reveal that SO 4 •− , O 2 •− and 1 O 2 were predominant reactive species involved in the catalytic process. Moreover, the damaged chemical structure of CoO during PMS activation could be healed by the photo-actuated Co(II) regeneration to allow for continuous and stable catalytic process. This study offers a promising perspective for the rational design of competent and stable hybrid heterojunction catalyst to construct PMS activation-photocatalysis processes for the efficient degradation of organic contaminants .
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 54
·48985-48994
·
IF 3.289
Xiaobing Wang,Zhichao Jia,Fuyuan Liu,Huijun Liang,Xinxin You,Kui Wang,Xiangdong Lou,Wei Shuang,Lichun Xiao,Bibo Cai,Lin Yang
Although anatase TiO2 demonstrates good performance in many applications, it is very difficult to synthesize nanocrystalline anatase TiO2 with high specific surface areas. Herein, two-dimensional hierarchically porous anatase TiO2 with specific surface area of 486 m2 g−1, is fabricated through acetic acid etching, which facilitates the crystal phase transition of amorphous TiO2. The pore sizes are within the ranges of 2–6 nm and 15–80 nm, and the pore diameters are 3.5 nm and 45 nm. As the anode materials for lithium ion batteries, the initial discharge capacity of hierarchically porous anatase TiO2 reaches to 449 mA h g−1 at a current rate of 0.1 A g−1 and retains 191 mA h g−1 after 60 cycles. In particular, the discharge capacities of 42 and 35 mA h g−1 can be resumed after 750 cycles at the current rates of 1 and 5 A g−1, respectively, exhibiting high electrochemical stability and high reversible capacity. Further research reveals that the fabrication of hierarchically porous anatase TiO2 depends on the amounts of HAc added, and the pH of the solution.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Huijie Zhang,Yuqing Xiao,Fei Qi,Pei Liu,Yuan Wang,Fangjie Li,Changlei Wang,Guojia Fang,Xingzhong Zhao
Hexagonal NaYF4:Yb3+,Tm3+@SiO2 upconversion nanoprism-mixed SiO2 passivation layers are introduced into hole-transport-layer free carbon-based perovskite solar cells to improve the power conversion efficiency. This layer on the top of the TiO2 scaffold has multiple functions: (i) upconversion units could transform near-infrared photons to visible region and thus extend the absorption range; (ii) nanoprisms act as light-scattering centers to prolong light-transmission distance and enhance light harvesting; (iii) SiO2 capping layer could suppress charge recombination at the interface of perovskite/TiO2 through passivation effect. The champion efficiency of our carbon-based device with an optimal amount of upconversion nanoprisms is 14.47%, which is 16.1% higher than that of the reference (12.46%). In addition, our unencapsulated solar cells exhibit good stability against moisture and thermal stressing in ambient condition. We also demonstrated another application of our device as a self-powered photodetector with NIR-sensitive features.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Kaiquan He,Hong Tan,Shizhen Li,Pu Hu,Chaoqun Shang
The Li-S batteries possessing high theoretical energy density are promising for next-generation energy storage. However, the shuttle effect and slow conversion of lithium polysulfides seriously hinder the practical application. In this contribution, introducing metallic Cu to modify dual-phase TiO 2 (rutile/anatase) grown on N-doped carbon nanosheets (denoted as Cu/mTiO 2 -NC) can act as a buffer layer to confine the active S species in the cathode region effectively. The corresponding systematic experiments show that the Cu/mTiO 2 -NC provides sufficient surface affinity to adsorb and capture polysulfides and has a highly conductive C/N skeleton to achieve rapid electron migration. Moreover, the metallic Cu can react with polysulfides to further immobilize polysulfides. Thus, the Li-S batteries, with the aid of optimal Cu/mTiO 2 -NC, exhibit a desirable discharge capacity of 811 mA h g –1 after 100 cycles at 0.2 C, which is 50 % higher than that without Cu/mTiO 2 -NC. Moreover, the optimum Li-S batteries deliver a discharge capacity of 435.45 mA h g –1 after 600 cycles at 0.5 C, corresponding to attenuation per cycle of only 0.09 %.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Yukun Yang,Wenyan Yan,Xiaomin Wang,Ligang Yu,Jinhua Zhang,Baoqing Bai,Caixia Guo,Sanhong Fan
In this work, a molecularly imprinted photoelectrochemical (MIP-PEC) sensor based on a novel PEC composite of metal-organic frameworks (MOFs) and TiO 2 (NH 2 -MIL-125(Ti)–TiO 2 ) was established for the ultrasensitive and selective detection of oxytetracycline (OTC). This is the first attempt of applying MOFs in the construction of MIP-PEC sensor. The NH 2 -MIL-125(Ti)–TiO 2 was synthesized by a simple one-step solvothermal method and modified onto the surface of indium tin oxide (ITO) electrode as the photosensitive layer. Subsequently, molecularly imprinted polymer (MIP) was modified as recognition element by electropolymerization . The NH 2 -MIL-125(Ti)–TiO 2 showed an enhanced photocurrent response due to stronger light absorption capacity and matched energy band. Furthermore, MIP greatly improved the selectivity and sensitivity of the constructed PEC sensor. The photocurrent response of the MIP-PEC sensor was reduced after OTC recognition because the specific binding of OTC to the imprinted cavities blocked the electron transfer of the electrode. Under optimal experimental conditions, the MIP-PEC sensor exhibited a wide detection range from 0.1 nM to 10 μM with a low limit of detection (LOD) of 60 pM, as well as certain reproducibility, stability and good applicability in real samples. The proposed sensor provides ideas for the application of MOFs in the construction of PEC sensors and will offer an alternative method for the detection of other pollutants in the field of food safety.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Bo Ma,Wei Guo,Jixiang Zhang,Cui Liu,Nian Li,Shudong Zhang,Zhenyang Wang
Radiation-cooled films accompanying the required high solar reflectance and emissivity as well as environmental durability are challenging to develop for passive daytime radiant cooling (PDRC) applications. Herein, an inorganic dielectric scatterer, producing strong scattering in the visible to near-infrared wavelength band, had been constructed by tunable TiO2 nanorod arrays with high refractive index on the surface of 2D Mica nanosheets with good mechanical strength and chemical stability. Subsequently, radiation-cooled aramid composite films featuring a well-organized 2D layered stack structure of inorganic scatterer was developed for PDRC applications. By the feature inorganic scatterers effectively stimulating multi-level scattering of light through TiO2 nanorod arrays and multi-layered Mica structures, the radiation-cooled aramid composite films have ultra-high reflectivity of 97.5% and emissivity of 96.3% in sunlight, and achieve subambient cooling of 8.62°C for daytime and 4.84°C for nighttime. Meanwhile, the well-organized lamellar PDRC films possess high strength (98 MPa) as well as excellent environmental durability, including scratch-resistant, UV radiation-resistant and flame retardance, suggesting its great potential in PDRC for thermal regulation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Tong Li,Yirong Xiao,Dongxue Guo,Liguo Shen,Renjie Li,Yang Jiao,Yanchao Xu,Hongjun Lin
A major issue hindering development of thin film nanocomposite (TFN) nanofiltration (NF) membrane is the interfacial defects induced by nanomaterial aggregation in top layer. Although various nanomaterials surface modification strategies have been developed to eliminate the interfacial defects, they usually involve extra modification steps and complex post-treatments. Inspired by the substrate-independent coating ability of tannic acid (TA) and the fact that the phenolic hydroxyl groups in TA can react with acyl chloride group in trimesoyl chloride, a TA coating solution containing TiO 2 nanoparticles was used as an aqueous phase of interfacial polymerization to prepare interfacial modified TFN NF membranes in this study. Surface modification of TiO 2 nanoparticles and interfacial polymerization can be carried out in a single step without any extra pre-modification step. It was found that the TA coating on TiO 2 nanoparticles surface could decrease TiO 2 aggregations and enhance interfacial compatibility between TiO 2 and polyester matrix. The TFN NF membrane prepared at a TiO 2 loading of 0.020 wt% exhibited a pure water flux of 28.8 L m -2 h −1 (284% higher than that of the controlled TFC membrane), and possessed enhanced NaCl and Na 2 SO 4 rejections of 57.9% and 94.6%, respectively, breaking through the trade-off between permeability and selectivity.
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DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Xin Tang,Xuan Zhang,Yingqi Chen,Wentai Zhang,Junyu Qian,Hanaa Soliman,Ai Qu,Qijun Liu,Shimin Pu,Nan Huang,Guojiang Wan
It remains challenging to build up a multifunctional coating onto biodegradable magnesium (Mg) for biomedical use. In this study, a small amount of titanium dioxide (TiO 2 ) has been incorporated in situ into phytic acid (PA) coating when it was chemically deposited on Mg substrate targeted to biodegradable implant applications. Ultraviolet (UV) irradiation was utilized in the liquid phase deposition of TiO 2 to improve the quality of coating (PA&TiO 2 -UV). This PA&TiO 2 -UV coating was compact, thicker and more hydrophilic compared with sole PA or TiO 2 coating. The PA&TiO 2 -UV coated Mg presented a seven times lower electrochemical corrosion current density as well as significantly slower in vitro degradation rate up to 500 h in phosphate buffer saline as compared to the direct PA coated Mg. In addition, the UV irradiation showed remarkably to promote the MC3T3-E1 pre-osteoblast cells adhesion and proliferation especially after 7 days of culture. Further, the PA&TiO 2 -UV coating adhered more firmly on Mg substrate after 90° bending than the other coatings, indicating a better mechanical compliance on Mg substrate. These results make this PA&TiO 2 -UV complex coating bodes well for biodegradation slowing-down, osteo-compatible as well as mechanical compliant modification of Mg for orthopedic implants applications.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yushun Zhou,Taimei Cai,Shuai Liu,Yanyan Liu,Huijie Chen,Zhongtian Li,Jun Du,Zhiqiang Lei,Hailong Peng
Organic contaminants in aquatic ecosystems have raised serious environmental concerns and pose severe risks to human health, and the catalytic efficiency of traditional TiO 2 catalysts has been greatly limited by photogenerated electron/hole recombination. Therefore, a novel catalyst of N-doped magnetic three-dimensional (3D) carbon microspheres@TiO 2 with a nanofibrous porous architecture (N-doped MCMs@TiO 2 ) was developed from the low-cost biomass of chitin. The N-doped MCMs@TiO 2 consist of N-doped carbon nanofibers, a 3D porous architecture, and a high surface area. TiO 2 nanoparticles were uniformly immobilized on the N-doped carbon nanofibers, resulting in many catalytic sites. The current density of N-doped MCMs@TiO 2 was approximately 0.247 uAcm −2 with 1.65 times than that of pure TiO 2 , and the bandgap of N-doped MCMs@TiO 2 was only 1.91 eV. Additionally, N-doped MCMs@TiO 2 had excellent adsorption capability for tetracycline (TC) (60.38%) and methyl orange (MO) (40.15%) in the dark after 40 min. Under the optimized conditions, N-doped MCMs@TiO 2 exhibited remarkable photodegradation performance for MO and TC mixture solutions, the degradation efficiencies of MO and TC were approximately 83.80% and 74.37% under UV irradiation, and that of was maintained at 68.07% and 76.55% even in cloudy weather, respectively. Meanwhile, N-doped MCMs@TiO 2 possess good potential for practical applications with long-term stability and can be easily recycled from solutions under an external magnet. Therefore, this work provides new insight into the fabrication of low-cost biomass-based 3D hierarchical porous carbon materials and that can be used as high-performance photocatalysts for the degradation of organic contaminants.
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