Desalination and Water Treatment
·
2014
·
IF 0.987
Wenli Zhang,Jiqin Li,Ziyang Lu,Yingying Luo,Fei Chen,Pengwei Huo,Jianming Pan,Yongsheng Yan
Magnetic TiO2 nanocomposites with good monodispersity were successfully synthesized via a mild sol–gel method, which were used for removal of salicylic acid (SA) residues from aqueous solution. These as-prepared nanocomposites were extensively characterized by transmission electron microscopy, scanning electron microscope, N2 adsorption–desorption isotherm with the Brunauer-Emmett-Teller method, Fourier-transformed infrared spectra, X-ray diffraction, and vibrating sample magnetometer. These results indicated that magnetic TiO2 nanocomposites possessed the core-shell structure of good dispersibility, excellent chemical stability, and magnetic property (Ms = 22.11 emu/g). According to the results of series experiments, magnetic TiO2 nanocomposites showed fast kinetics and satisfied adsorption capacity for adsorption of SA. Under the optimum experimental condition, the adsorption process followed pseudo-second-order reaction kinetics and Langmuir adsorption isotherm. Moreover, the thermodynamic parameters calculated from the adsorption data suggested that the adsorption of SA was a spontaneous and endothermic nature of the process. In addition, magnetic TiO2 nanocomposites were proved to exhibit high catalytic efficiency for photodegradation of SA under visible light irradiation, and the intermediate products of photodegradation were inferred from the mass spectrometry.
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DOI
高影响因子
SOLID STATE PHENOMENA
·
2022
·
IF 0
Xiao Ying Yan,Guo Bao Zhang,Rong Hui Yuan,Xiang Yu Ye,Xi Xi Chen,Hui Hui He
We reported a facile solvothermal approach to synthesize C/N-doped TiO2 (C/N-T) using a template-free method. The morphology and composition of the C/N-T were evaluated by transmission electron microscopy, X-ray diffraction, wavelength dispersive spectroscopy and X-ray photoelectron spectroscopy. The photodegradation of formaldehyde was studied in environmental chambers under specific conditions combined with UV-Vis determinations. The catalytic oxidations of C/N-T nanoparticles were characterized by degrading formaldehyde of plywood, which was induced via visible-light illumination. A maximum 95.7% of degradation efficiency within 55 min showed enhanced photocatalytic activity.
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DOI
Desalination and Water Treatment
·
2016
·
IF 1.272
Guangxin Zhang,Bin Wang,Zhiming Sun,Shuilin Zheng,Shushu Liu
Three kinds of diatomites as catalyst carriers were adopted to prepare supported TiO2 catalysts by a typical hydrolysis–deposition method. The prepared composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption–desorption, scanning electron microscopy transmission electron microscopy, UV–vis diffuser reflectance, and chemical oxygen demand. The photocatalytic properties of composites were determined using rhodamine B, methyl orange, and methylene blue as target pollutants under UV light irradiation. A comparative study on the photocatalytic properties of composite catalysts was carried out. It is indicated that the catalytic performance of TiO2/diatomite is significantly influenced by the physicochemical properties of diatomite supports. Compared with pure TiO2, the TiO2/diatomite composites exhibited smaller crystalline size of TiO2 and better dispersibility, which induced higher specific surface area and better photo-degradation efficiency. The highest activity of the photocatalyst should be attributed to the acid-activated support, which provided more active sites for the degradation reaction. Besides, the durabilities of catalysts were also investigated. The experimental results indicated that the prepared composite is a promising material for the wastewater treatment for its good photocatalytic property and reusability.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10352-10358
·
IF 3.288
Danlin Bu,Na Li,Yu Zhou,Hengyu Feng,Fei Yu,Chunxia Cheng,Ming Li,Linghan Xiao,Yuhui Ao
N-Halamine-based antibacterial materials are widely used due to their excellent characteristics. However, the N–Cl bonds in N-halamine-based materials are not stable under UV light irradiation so that they are difficult to recover and reuse. Here, a kind of N-halamine-immobilized Fe3O4@SiO2@TiO2(F@S@T-Cl) nanoparticles were prepared. In addition, the UV stability and regeneration capacity were also studied after variable time exposure to UV light. The results showed that nanoparticles have great antibacterial properties against Staphylococcus aureus and Escherichia coli. Meanwhile, the N–Cl bond in the nanocomposite showed outstanding storage stability under UV light irradiation and good regeneration ability; the material can realize cyclic utilization and solve the problem of secondary pollution of the antibacterial material. It provides a broader application prospect for the recyclable N-halamine antibacterial material.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2020
·
IF 6.146
Junxiong Guo,Yiyi Li,Shangdong Li,Xumei Cui,Yu Liu,Wen Huang,Linna Mao,Xiongbang Wei,Xiaosheng Zhang
We synthesized a mesoporous film based on TiO 2 –reduced graphene oxide (RGO) hybrids using a one-step vapor-thermal method without the need for an additional annealing process. The vapor-thermally prepared TiO 2 -graphene hybrid (VTH) features unique structures with an ultra-large specific surface area of ˜260 m 2 g −1 and low aggregation, giving rise to enhanced light harvesting and increased charge generation and separation efficiency. It was observed that a mesoporous film with uniform pore distribution is simultaneously obtained during the VTH growth process. When a 5.0 wt% RGO VTH film was used as the active layer in photocatalysis , the highest photocatalytic activity for degradation of methyl orange was achieved. For another, when a 0.75 wt% RGO VTH film was used as the photoanode in a dye-sensitized solar cell, the power conversion efficiency reached 7.58%, which represents an increase of 73.1% compared to a solar cell using an a photoanode of pure TiO 2 synthesized by a traditional solvothermal method. It is expected that this facile method for the synthesis of TiO 2 /graphene hybrid mesoporous films will be useful in practical applications for preparing other metal oxide/graphene hybrids with ultra-high photocatalytic activity and photovoltaic performance.
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Guang Gao,Zelun Zhao,Jia Wang,Yongjie Xi,Peng Sun,Fuwei Li
ABSTRACT Engineering the surface microenvironment by tuning the binary interactions between a supported metal with a secondary metal oxide (MO x ) or support has been a common method for improving the catalytic performance of supported metal catalysts. However, few studies have investigated the ternary interactions among the metal, MO x , and support. Here, we report for the first time the formation of metal-MO x -support interaction (MMSI) in reducible TiO 2 -supported PtReO x catalysts, affording 87% yield and 100% ee in the tandem hydrogenation of an aqueous chiral cyclohexane-1,2-dicarboxylic acid into the corresponding diol; the catalytic activity is eight times higher than that obtained with non-reducible support counterparts in the same reaction via traditional batch synthesis with multiple steps and unfriendly reagents. Detailed experimental and computational studies suggest that the TiO 2 crystalline phase-dependent density of the oxygen vacancies induces different Pt-ReO x -TiO 2 interactions, which dominate the electron transfer therein and tune the adsorption strength of the carbonyl moiety of the substrate/intermediate, thus promoting the hydrogenation activity and selectivity. In addition, the strong MMSI endows the optimal rutile TiO 2 supported PtReO x catalyst with an outstanding lifetime of 400 h in a fixed-bed reactor under acidic aqueous conditions and ensures efficient applications in the selective hydrogenation of aliphatic dicarboxylic acids and functional carboxylic acids. This work provides a promising strategy for the development of efficient and stable supported catalysts for the selective hydrogenation of diverse C–O and C=O bonds.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Weilin Zhong,Chao Wang,Bo Jiang,Suqing Peng,Hailun Zhao,Riyang Shu,Zhipeng Tian,Yanping Du,Ying Chen
Combining solar energy utilization and hydrogen production is an ideal model for renewable energy development. Especially the conversion of broad-spectrum solar energy into chemical energy of hydrogen and thermal energy can enrich solar energy storage methods. Herein, novel multifunctional Au/TiO 2 @n-octadecane microcapsules with core-shell structure were design and synthesized by wet chemical reduction and electrostatic adsorption self-assembly methods for photothermal hydrogen production and thermal storage . The results showed that microencapsulation of photothermal catalysts could provide an effective reaction area and excellent dispersion stability , where hydrogen production and light to hydrogen efficiency were increased in the 43% and 0.3% respectively, compared to the nanoparticle suspension system. Based on the recorded temperature variations caused by the photothermal effect, the calculated photothermal conversion efficiency and specific absorption rate of Au/TiO 2 @n-octadecane was 25.01% and 277% higher than that of Au/TiO 2 suspension. The proposed hydrogen production and thermal storage method via multifunctional microcapsules might shed some light on the study of improving full-spectrum energy conversion efficiency of solar energy.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Li Shao,Heng Liu,Weiping Zeng,Caiyun Zhou,Dan Li,Liang Wang,Yeqian Lan,Feigao Xu,Gousheng Liu
It was found that, among these chitosan@TiO 2 (Cs@TiO 2 ) composites calcined at different temperatures (200, 300, 400, 500 and 600 °C), the composite calcined at 300 °C (Cs@TiO 2 -300) showed the best adsorption and photocatalytic activity . To eliminate the limitation of recycling catalyst nanoparticles , the PDMS-SiO 2 -Cs@TiO 2 composites with hydrophobic surfaces were prepared for dye degradation by embedding Cs@TiO 2 -300 nanoparticles into a PDMS-SiO 2 sol-gel system. More concretely, with pumice stone as the support of composites, the experiment was carried out in a reaction bed. When pumice stones were used as supports for PDMS-SiO 2 -Cs@TiO 2 composites, compared with its initial concentration, the concentration of dye solution decreased by 36% after 30 h of simulated sunlight irradiation. Additionally, the degradation efficiency of dyes hardly decreased after five cycles. The optical property and surface structure of PDMS-SiO 2 -Cs@TiO 2 were characterized by UV–Vis DRS and XPS , respectively. It is noteworthy that the UV–Vis DRS results indicated that the light absorption range of both Cs@TiO 2 -300 composites and PDMS-SiO 2 -Cs@TiO 2 composites had been broadened to the visible light region. Moreover, the XPS results indicated the existence of nitrogen (N) doped titanium on the surface of PDMS-SiO 2 -Cs@TiO 2 composites.
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·1-9
·
IF 1.784
Feng Guyu,Wang Xinyue,Zhang Diantang,Xiao Xueliang,Qian Kun
The performance degradation of polypropylene (PP) fibers which induced by ultraviolet (UV) irradiation are commonly defect in service, especially in the outdoor environment. In this study, ZnO coated nano-TiO 2 with resistance in full range of UV irradiation is prepared by ultrasonic-microwave homogeneous precipitation method. The chemical structure, physical–chemical property, and atomic structure and surface morphology of the ZnO coated nano-TiO 2 are systematically investigated by FTIR, XRD, BET and TEM analysis. The uvioresistant PP fibers are prepared by melting blending method with PP and coated nano-TiO 2 as raw materials. The effect of coated nano-TiO 2 on UV resistance of PP fibers is described by carbonyl index, molecular weight and mechanical property. Results showed that PP fibers with coated nano-TiO 2 exhibited excellent UV shielding effect in full range of UV irradiation.
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DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 14
·8683
·
IF 4.614
Xiang Guo,Lei Rao,Zhenyu Shi
Adsorption can quickly remove pollutants in water, while photocatalysis can effectively decompose organic matter. B-TiO2/g-C3N4ternary composite photocatalytic materials were prepared by molten method, and their adsorption–degradation capability under visible light conditions was discussed. The morphology of the B-TiO2/g-C3N4materials was inspected by SEM, TEM, BET, and EDS, and the results showed that close interfacial connections between TiO2and g-C3N4, which are favorable for charge transfer between these two semiconductors, formed heterojunctions with suitable band structure which was contributed by the molten B2O3. Meanwhile, the molten B2O3effectively increased the specific surface area of TiO2/C3N4materials, thereby increasing the active sites and reducing the recombination of photogenerated electron–hole pairs and improving the photocatalytic degradation abilities of TiO2and g-C3N4. Elsewhere, the crystal structure analysis (XRD, XPS, FTIR) results indicated that the polar -B=O bond formed a new structure with TiO2and g-C3N4, which is not only beneficial for inhibiting the recombination of electron holes but also improving the photocatalytic activity. By removal experiment, the adsorption and degradation performances of B-TiO2/g-C3N4composite material were found to be 8.5 times and 3.4 times higher than that of g-C3N4. Above all, this study prepared a material for removing water pollutants with high efficiency and provides theoretical support and experimental basis for the research on the synergistic removal of pollutants by adsorption and photocatalysis.Keywords:adsorption;degradation;B2O3;TiO2/C3N4;molten
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Xu,Zhiwen He,Shuili Yu,Lei Li,Luyang Cai,Peng Yi
Recently, the heterogeneous advanced reduction processes (ARPs) for bromate (BrO 3 - ) degradation have attracted considerable attention due to its stable performance and easy combination with UV disinfection. In this study, a UV/TiO 2 -Bi advanced reduction process (ARP) was established for BrO 3 - removal without adding external sacrificial agents. In the UV/TiO 2 -Bi ARP, Bi nanoparticles (NPs) doped on the TiO 2 acted as hole trapping centers, while TiO 2 NPs were used as reduction centers for the reduction of BrO 3 - , which enhanced the charge carrier separation. The UV/TiO 2 -Bi-1% ARP exhibited the highest BrO 3 - removal rate without the addition of sacrificial agents in the reaction solution compared to UV/TiO 2 ARP and the UV/TiO 2 -Bi ARP at other Bi/Ti ratios. The result of 72% removal of 200 µg/L BrO 3 - at 60 min by 0.2 g/L TiO 2 -Bi-1% in tap water at pH 6.8 and 7.71 mg/L dissolved oxygen (DO) demonstrates the promising potential of the UV/TiO 2 -Bi ARP for the removal of BrO 3 - in practical applications. Compared to the 99.5% removal in deionized (DI) water at 60 min, lower BrO 3 - reduction in tap water was likely attributed to the consumption of photo-generated electrons by NO 3 – and the adsorption of natural organic matter on the surface of TiO 2 -Bi-1% nanocomposites. The study provides not only a novel BrO 3 - removal system with good photo-reduction performance, but also some guidance for the influence of constituents in raw water on the treatment of BrO 3 - .
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shengtang Liu,Yaohua Li,Ce Zhang,Xi Chen,Zheng Wang,Fangming Cui,Xiaojing Yang,Wenbo Yue
Lithium sulfur (Li–S) batteries are regarded as one of the most promising next-generation secondary batteries. However, the insulating nature of active materials, inevitable shuttle effect caused by dissolution of intermediate polysulfides , and severe volume expansion during lithiation prevent their practical application. Herein, we report a novel sulfur host composed of amorphous TiO 2 nanofilm interfaces coating on mesoporous carbon by controlling the hydrolytic process of tetrabutyl titanate on the surface of 3D interconnect conductive carbon matrix. The sulfur host shows high surface area, considerable electrolyte wetting capability and strong absorption for lithium polysulfides. Owe to the rational design and outstanding properties, the sulfur cathode with the high active material content of ∼74% and mass loading of ∼3.2 mg cm −2 exhibits a high initial specific capacity of 1455 mAh·g −1 and maintained 1242 mAh·g −1 after 200 cycles at 0.1 C (1C = 1675 mAh·g −1 ) current density, and also delivers excellent long term cycling performance at 1 C with initial capacity of 720 mAh·g −1 and capacity remained up to 81% after 1000 cycles.
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DOI
高影响因子
危险品化学品经营许可证（带存储）