INDUSTRIAL CROPS AND PRODUCTS
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2017
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IF 3.181
Xiaoting Zhang,Shuangshuang Jing,Zehong Chen,Linxin Zhong,Qingzhong Liu,Xinwen Peng,Runcang Sun
3D porous inorganic materials play a vital role in various applications, such as adsorption, catalysis, and electrochemistry, and are an ongoing interest in the synthesis of advanced porous materials. Herein, we aimed to fabricate 3D free-standing hierarchical porous TiO 2 and SiO 2 with tunable porous structure and high specific surface area by using cellulose aerogel as a new biotemplate. The results revealed that the hierarchical porous structure of 3D porous TiO 2 and SiO 2 could be easily tailored by controlling annealing process. The physicochemical structure of the resultant porous materials, such as morphology, specific surface area and phase structure, strongly depended on the thermal stability of the biotemplate. 3D porous TiO 2 and SiO 2 with specific surface areas of high up to 221.1 m 2 /g and 451.3 m 2 /g could be obtained, respectively. In addition, the as-prepared TiO 2 exhibited a high photocatalytic activity, demonstrating their potential application in advanced photocatalysis.
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CHEMICAL ENGINEERING SCIENCE
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2016
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IF 2.75
Chen-Hao Ji,Shuang-Mei Xue,Zhen-Liang Xu,Xiao-Hua Ma
In this work, a novel hollow fiber catalytic packing (HFCP) was fabricated of ZrO 2 (shell)/TiO 2 (core) (TZ) solid superacid nanoparticles , perfluorinated sulfonic acid resin (PFSA) and polyethersulfone (PES) via wet-spinning method. TZ was a homemade binary solid superacid nanoparticles with core–shell structure using superfine titania (5 nm) as the core and mesoporous tetragonal phase zirconia as the shell. It was synthesized through the hydrolysis of zirconium oxychloride in the presence of titania nanoparticles and cetyltrimethylammonium bromide (CTAB) hexagonal crystals covered on the titania core and followed by calcination and acidification. HFCPs demonstrated well catalytic performance in the esterification test of ethanol and acetic acid due to the superacid sites on the surface of TZ and PFSA polymer chain. And the superacid sites on the PFSA polymer chain could be sufficiently exposed by the embedding of the nanoparticles. At the same time, HFCPs also showed ultrahigh recovery which was more than 99.5% in 6 runs because of the well integrality benefited from the wet-spinning method. The specific surface area (SSA) and pore size distribution were analyzed by N 2 adsorption–desorption, the result showed that the SSA of HFCPs decreased with the increasing of the PFSA additive amount. The SSA of the HFCP with the best catalytic performance could be up to 90.60 m 2 /g, in which the PFSA weight proportion was 13%. The XRD pattern and HRTEM image showed the HFCPs i.e. the zirconia shell of TZ formed uniform tetragonal phase. Other characterizations such as FT-IR, XPS, SEM and TEM were utilized to determine the chemical composition and morphology of the HFCPs and TZ, the results showed the novel catalytic packing was a suitable catalyst for the acid catalyzed reactions.
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JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Lifei He,Li Chen,Yue Zhao,Weilin Chen,Chunhui Shan,Zhongmin Su,Enbo Wang
In this work, two kinds of polyoxometalate (POM) nanoparticles with controlled shapes and structures were synthesized by micelle directed method and then composited with TiO 2 via calcination to remove the surfactants owing to the excellent electronic storage and transmission ability of POM, finally obtaining two kinds of TiO 2 composites with highly dispersed and small-sized POM nanoparticles (∼1 nm). The TiO 2 composites were then induced into the photoanodes of dye-sensitized (N719) solar cells (DSSCs). The separation of electron-holes becomes more favorable due to the nanostructure and high dispersion of POM which provide more active sites than pure POM tending to agglomeration. The TiO 2 composite photoanodes finally yielded the power conversion efficiency (PCE) of 8.4% and 8.2%, respectively, which were 42% and 39% higher than the pristine TiO 2 based anodes. In addition, the mechanisms of POM in DSSC are proposed.
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Environmental Progress & Sustainable Energy
·
2016
·Vol. 36
·期 2
·494-504
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IF 1.631
Zhengjiang Liu,Lei Xing,Huiyan Ma,Lin Cheng,Juming Liu,Jucai Yang,Qiancheng Zhang
Sulfated Ce-doped TiO 2 photocatalysts, with improved visible light photocatalytic activity, are prepared by sol-gel method and via impregnation with diluted sulfuric acid. The synthesized samples are characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet–visible diffuse reflectance spectra (UV–Vis DRS), Fourier transform infrared (FTIR) spectroscopy, temperature-programmed desorption of ammonia (NH 3 -TPD) and X-ray photoelectron spectroscopy (XPS). To investigate the effect of Ce doping as well as acid sites on the photoactivity of the synthesized photocatalyst, photocatalytic degradation of Rhodamine B in an aqueous solution is used as a probe reaction to evaluate the photocatalytic activity of the as-prepared samples under visible light irradiation. It reveals that Ce doping can improve the photocatalytic response of TiO 2 to visible light and the presence of Ce 4+ /Ce 3+ redox process facilitates the separation of photo-generated electrons and holes. In addition, the impregnation can create Lewis acid sites on the obtained catalyst surface. Lewis acid sites on the catalyst surface could increase the amount of adsorbed oxygen (O ad ) and consequently improve the transform efficiency of Ce 3+ to Ce 4+ . Thereafter an increase in the phtocatalytic activity of sulfated Ce-doped TiO 2 is achieved. The possible mechanism of RhB degradation by sulfated Ce-doped TiO 2 photocatalyst is preliminarily discussed. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 494–504, 2017
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 24
·8516-8524
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IF 5.287
Lei Huang,Kaiwen Zha,Supawadee Namuangruk,Anchalee Junkaew,Xin Zhao,Hongrui Li,Liyi Shi,Dengsong Zhang
Surface engineering of TiO2 is significant in the SCR reaction and worth studying. In a previous study, we found that TiO2 nanosheets (TiO2-NS) with the (001) plane exhibited a much better SCR performance than TiO2 nanoparticles (TiO2-NP) with the (101) plane. In this work, in situ DRIFTS and DFT calculations were applied to address the promotional effect of the (001) plane of TiO2-NS in the SCR reaction. The behavior of adsorption and desorption of NOx and NH3 on the two surfaces was studied. It was found that NH3 adsorbed on both TiO2-NS and TiO2-NP was in the form of NH3(g) on the Lewis acid sites. NOx on TiO2-NP were mainly trans-(NO)2 and N2O4 which were non-reactive. Differently, NO on TiO2-NS was mainly in the form of NO2 which was probably due to the high energy and abundant active oxygen species of the (001) facet. The formed NO2 could trigger the subsequent ‘fast SCR’ reaction thereafter promoting the activity. Therefore, TiO2-NS with more (001) facets had better SCR activity than TiO2-NP with the exposed (101) facet.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2024
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IF 3.6
Yu Jiang,Zhou Wan,Qi Liu,Xinxin Li,Bo Jiang,Mudan Guo,Pengjue Fan,Siyi Du,Doudou Xu,Chen Liu
Titanium (Ti) implants are widely used in orthopedic and dental applications due to their excellent biocompatibility and mechanical properties. However, bacterial adhesion and subsequent biofilm formation on implant surfaces pose a significant risk of postoperative infections and complications. Conventional surface modifications often lack long-lasting antibacterial efficacy, necessitating the development of novel coatings with enhanced antimicrobial properties. This study aims to develop a novel Ag-TiO2-OTS (Silver-Titanium dioxide-Octadecyltrichlorosilane, ATO) nanocomposite coating, through a chemical plating method. By employing a ‘resist-killing-disintegrate’ approach, the coating is designed to inhibit bacterial adhesion effectively, and facilitate pollutant removal with lasting effects. Characterization of the coatings was performed using spectroscopy, electron microscopy, and contact angle analysis. Antibacterial efficacy, quantitatively evaluated against E. coli and S. aureus over 168 h, showed a significant reduction in bacterial adhesion by 76.6% and 66.5% respectively, and bacterial removal rates were up to 83.8% and 73.3% in comparison to uncoated Ti-base material. Additionally, antibacterial assays indicated that the ratio of the Lifshitz-van der Waals apolar component to electron donor surface energy components significantly influences bacterial adhesion and removal, underscoring a tunable parameter for optimizing antibacterial surfaces. Biocompatibility assessments with the L929 cell line revealed that the ATO coatings exhibited excellent biocompatibility, with minimal cytotoxicity and no significant impact on cell proliferation or apoptosis. The ATO coatings provided a multi-functionality surface that not only resists bacterial colonization but also possesses self-cleaning capabilities, thereby marking a substantial advancement in the development of antibacterial coatings for medical implants.
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DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Tianyi Cui,Yuan Zhang,Mingxia Tian,Yumin Yan,Guyu Zhang,Tao Zhang,Jianbo Zhao,Jianhui Jiang
In this study, agricultural waste cotton stalk was used as biomass carbon source, calcined with TiO 2 at a high temperature, deposited in a TiO 2 lattice, and used as an electron acceptor to inhibit photogenerated electron recombination. Subsequently, it underwent secondary calcination with g-C 3 N 4 to form a C-TiO 2 /g-C 3 N 4 composite catalyst. Experimental results showed that the coupling of carbon-doped TiO 2 and g-C 3 N 4 accelerated photogenerated electron–hole pairs pair migration, effectively inhibited the recombination of photogenerated carriers, and thus improved the removal efficiency of methylene blue (MB) and tetracycline hydrochloride (TC). Upon irradiation with a 500 W xenon lamp, the degradation rates of MB and TC achieved were 92.6 % and 95.3 % in 90 min, respectively.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Bo-hui Li,Kai-hua Zhang,Xiao-jing Wang,Yu-pei Li,Xinying Liu,Bao-Hang Han,Fa-tang Li
High-performance photocatalysts for catalytic reduction of CO 2 are largely impeded by inefficient charge separation and surface activity. Reasonable design and efficient collaboration of multiple active sites are important for attaining high reactivity and product selectivity . Herein, Cu-Cu 2 O and Ag nanoparticles are confined as dual sites for assisting CO 2 photoreduction to CH 4 on TiO 2 . The introduction of Cu-Cu 2 O leads to an all-solid-state Z-scheme heterostructure on the TiO 2 surface, which achieves efficient electron transfer to Cu 2 O and adsorption and activation of CO 2 . The confined nanometallic Ag further enhances the carrier’s separation efficiency, promoting the conversion of activated CO 2 molecules to •COOH and further conversion to CH 4 . Particularly, this strategy is highlighted on the TiO 2 system for a photocatalytic reduction reaction of CO 2 and H 2 O with a CH 4 generation rate of 62.5 μmol∙g −1 ∙h −1 and an impressive selectivity of 97.49 %. This work provides new insights into developing robust catalysts through the artful design of synergistic catalytic sites for efficient photocatalytic CO 2 conversion.
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Sustainable Energy Technologies and Assessments
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2024
·
IF 7.1
Linhao Wang,Dongqiang Lei,Yue Lv,Ruishen Guo,Ying Wu,Zhifeng Wang
In the study, a novel photodeposition one-step method for preparing Cu/TiO 2 photothermal catalysis was proposed to catalyze hydrogen production from glycerol. The biomass glycerol was used as a sacrificial agent to provide electrons for Cu 2+ loading during the catalyst preparation stage, and the remaining biomass glycerol was used directly as a reactant for photothermal-catalyzed hydrogen production. The catalysts were characterized using XRD, SEM, and TEM to obtain their phases and structures. The Cu/TiO 2 photodeposition process evaluation method based on image analysis and processing, and its experimental platform were established. The influence of parameters such as irradiation intensity, temperature, and catalyst concentration on the loading rate of photodeposited Cu 2+ was analyzed. The results demonstrated that enhancing the irradiation intensity, increasing the temperature, and decreasing the catalyst concentration can increase the loading rate of Cu. The Cu/TiO 2 photothermal catalyst prepared by this method showed a hydrogen production rate 1.6 times higher than that of the deposition and precipitation method under the same reaction conditions, which proved that the catalyst had a high photothermal catalysis hydrogen production activity. The hydrogen production rate at an irradiation intensity of 250 mW/cm 2 was 628.16 μmol/(g·h), which was 1.9 times that at an irradiation intensity of 100 mW/cm 2 . Both elevated temperature and increased irradiation intensity can significantly improve the photothermal catalysis glycerol hydrogen production activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yunhong Pi,Wenting Lin,Meijin Zhang,Jingyao Yang,Tiejun Wang
We present the design of a novel functional metal-organic framework here, denoted as Co-sal–NH 2 –MOF@TiO 2 , featuring the comprise of controllably in-situ grown TiO 2 sheets from NH 2 -MOF(Ti) and [Co] catalytic sites stabilized by salicylaldimine moiety via site isolation for visible-light-driven hydrogen evolution from water. The hierarchical organization of TiO 2 and Co catalyst within NH 2 -MOF (Ti) leads to outstanding photocatalytic performance, as evidenced by a H 2 yield of 15,584 μmolg −1 h −1 and turnover numbers (TON) reaching 5844 over 24 h. This catalyst also signifies distinctly enhanced activities of approximately 105-fold, 354-fold, 15-fold, and 100-fold, compared to the pristine NH 2 -MOF(Ti), MOF-derived TiO 2 , NH 2 -MOF(Ti)@TiO 2 and the combination of [Co catalyst + NH 2 -MOF(Ti) + TiO 2 ], respectively. EXAFs and XPS etc. analyses revealed a stable coordination environment for salicylaldimine-supported Co(II) catalytic unit, which integrated with in-situ grown TiO 2 sheets can not only guarantee catalyst stability, but also generate much more densely packed light-harvesting heterojunction units and thus promote separation and transfer of photogenerated carriers between TiO 2 and Co catalyst in NH 2 -MOF(Ti) under light through optimized band gap structure. This work outlines the in-situ construction of organic and inorganic hybrid heterojunction for H 2 production from water.
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TALANTA
·
2024
·
IF 5.6
Konghao Han,Zilong Yan,Zhuang Ding,Pengfei Zhou,Cheng Ye,Ling Qin,Zhiyong Bao,Maofeng Zhang,Wei Zhang
The proliferation of micro/nanoplastics (MNPs) has emerged as a pivotal environmental issue, largely due to their potential for human exposure. Consequently, the development of sensitive and efficient detection methodologies is paramount for elucidating their environmental footprint. Here, we report a novel three-dimensional (3D) surface-enhanced Raman scattering (SERS) sensor, which integrate Ti 3 C 2 T x /TiO 2 /W 18 O 49 semiconductor heterostructure, for the rapid and sensitive detection of MNPs in environmental matrices. The sensor's unique layered architecture and efficient charge transfer mechanism endow it with high sensitivity. It has demonstrated remarkable detection capabilities, achieving a sensitivity of 10 −8 M for Rhodamine 6G (R6G), equating to an enhancement factor (EF) of 2.33 × 10 6 . This level of sensitivity allows for the detection of polystyrene (PS) microplastics at concentration as low as 25 μg/mL, with a relative standard deviation (RSD) of 12.58 %, signifying superior reproducibility. Moreover, the sensor's fingerprinting capabilities enable the identification of a variety of MNPs, including polyethylene (PE) and polyethylene terephthalate (PET), thus facilitating the analysis of complex MNPs mixtures. The sensor's applicability to real-world samples was confirmed through the quantitative detection of PS microplastics in rainwater, soil, and industrial wastewater, with a detection limit of 25 μg/mL and exhibiting good linearity. It is concluded that the 3D SERS sensor is a promising tool for the rapid and precise detection of MNPs across diverse environmental matrices. The advent of this technology marks a significant leap forward in environmental analysis, providing a robust method for the monitoring of MNPs pollution.
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JOURNAL OF FOOD SCIENCE
·
2024
·Vol. 89
·期 5
·2879-2894
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IF 3.2
Mahsa Kheirandish,Majid Javanmard dakheli,Maryam Mizani,Alireza Salehirad
The aim of this study was the synthesis of bimetallic nanoparticles based on Fe 2 O 3 /TiO 2 and its use in the poly(lactic acid) (PLA) films as an oxygen scavenger in extra virgin olive oil (EVOO) packaging. Bimetallic nanocomposites were prepared by two different precipitation methods (precipitation with ammonia and sodium hydroxide). The characteristics of bimetallic nanoparticles precipitated with sodium hydroxide (Na-Ti 0.01 Fe 0.048 O 0.08 ) and bimetallic nanoparticles precipitated with ammonia (NH-Ti 0.01 Fe 0.022 O 0.09 ) were compared. Relative amounts of elements in bimetallic nanocomposites and their morphological characteristics were determined using field emission scanning electron microscopy coupled with energy-dispersive X-ray spectrometer. Porosity volume and surface area of bimetallic nanoparticles were calculated using adsorption–desorption isotherms and the Brunauer–Emmett–Teller method. The formation/characterization of bimetallic nanoparticles and their location in the matrix of PLA-based nanocomposite film was studied using X-ray diffraction and Fourier transform infrared. In nanocomposite films based on PLA, bimetallic nanoparticles lead to better oxidative stability (peroxide value, p -anisidine index, K 232 , and K 270 ) of the EVOO and oxygen scavenging during storage compared to free nanoparticles. Mechanical properties of nanocomposite films were improved due to bimetallic nanoparticles, which were better for Na-Ti 0.01 Fe 0.048 O 0.08 . In vitro release modeling of the bimetallic nanoparticles in EVOO proved that Fickian diffusion is the dominant mechanism, and the Peleg model was the best description of the release behavior of nanoparticles.
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