Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Xu Duan,Jian Yang,Guang Hu,Chen Yang,Yangfan Chen,Qingcai Liu,Shan Ren,Jiangling Li
In this work, based on a type of energy band engineering strategy as calcination , TiO 2 /ZSM-5 hybrids for photodegradation of methyl orange (MO) in water under UV light have been developed via a facile solid state diffusion method. Effects of varied calcination temperatures on TiO 2 /ZSM-5 hybrids have been systematically characterized including XRD , FT-IR, SEM, TEM , EDX mapping, BET, PL , EIS , UV–vis DRS, active species trapping experiments and Mott-Schottky curves. It was found that the calcination temperature influenced photocatalytic activity , typically on physicochemical properties of materials and adjustment for the energy gap and band position of TiO 2 . The XRD analysis revealed that hybridization of ZSM-5 kept the crystal phase of TiO 2 as anatase unchanged with the high-rising calcined temperature. The optimum sample calcined at 450 °C named as Z-T (450) presented nearly 99% degradation rate for MO, owing to optimal uniform distribution, highest specific surface area and best charge separation/transfer efficiency. The FT-IR comparison result that the functional groups and peak strength of the used catalyst were alike as before, showed the stability of photocatalyst . Adoption of calcination strategy does provide not only a clean, low-cost and highly efficient path to approach the complete degradation of azo dyes , but also a chance for photocatalytic technology to fulfill the implementation in industrial applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 5
·3795-3804
·
IF 2.993
Song Lixin,Jing Wanru,Chen Jingjing,Zhang Shouren,Zhu Yuqing,Xiong Jie
The light response range, reusability, and durability of photocatalyst are the key issues for its practical application. To address these problems, the C-doped TiO 2 /carbon nanofibrous (CTCNF) film with incorporation of C-doped TiO 2 nanoparticles into carbon nanofibers was prepared by electrospinning and calcination (pre-oxidation and carbonization). All the obtained CTCNF films exhibited a promising light absorption in ultraviolet–visible region. With optimization of carbonization temperature, the CTCNF film carbonized at 800 °C (CTCNF-800) showed a strongest light absorption. Consequently, the CTCNF-800 possessed a highest photocatalytic degradation efficiency of 94.2% for degradation of rhodamine B. In addition, the CTCNF-800 possessed excellent flexibility and deserved mechanical strength, and hence, the CTCNF-800 could be easily segregated from solution and recycled. Satisfyingly, its degradation efficiency still exceeded 92% after using for six cycles, implying that the CTCNF had excellent reusability and well stability. Besides, the degradation efficiency was over 90% after the CTCNF-800 kept in air without illumination for 1 year, indicating its outstanding durability. The CTCNF film photocatalyst demonstrates tremendous potential in practical application for purification of wastewater.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2018
·Vol. 47
·期 4
·2230-2236
·
IF 1.566
Yin Xin,Guan Yingli,Song Lixin,Xie Xueyao,Du Pingfan,Xiong Jie
A bi-layer photoanode is successfully fabricated for dye-sensitized solar cells (DSSCs) composed of P25/TiO 2 nanorod (P25/TNR) as the underlayer and TiO 2 nanosheet spheres (TNSs) as the light-scattering layer. Notably, the P25-TNR provides multiple functions, including more dye loading, more efficient charge transport and a lower electron recombination rate for the photoanode. Besides, the unique structure of TNS can significantly improve the light-harvesting capacity, boosting the light-harvesting efficiency. Therefore, an enhanced short-circuit current and power conversion efficiency of 18.04 mA cm −2 and 5.99%, respectively, were achieved for the P25/TNR-TNS-based DSSC, which was better than that of the P25-TNS-based (15.17 mA cm −2 , 5.36%) and bare TNS-based (11.43 mA cm −2 , 4.14%) DSSCs. This indicates that this bi-layer structure effectively combines the advantages of the one-dimensional (1D) nanostructure and three-dimensional (3D) hierarchical structure. In short, this work demonstrates the possibility of fabricating desirable photoanodes for high-performance DSSCs by rational design of nanostructures and effective combination of multi-functional components.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 13
·20621-20636
·
IF 0
Yin Bingjie,Li Jingying,Guo Wei,Dong Haoqing,Zhang Guangshan,Xin Yanjun,Zhang Guodong,Chen Qinghua
Polycyclic aromatic hydrocarbons (PAHs) in soil are potentially harmful to human health. However, the use of photocatalysis technology to treat soil contaminated with PAHs remains challenging. Therefore, TiO 2 /α-FeOOH composite photocatalyst has been synthesized by hydrothermal method and sol–gel method and applied to photocatalytic degradation of fluoranthene in soil. The morphology, elements, crystal structure, optical properties, electrochemical characteristics, and photocatalytic activity of TiO 2 /α-FeOOH have been characterized. Results showed that TiO 2 is tightly fixed on the surface of α-FeOOH, and TiO 2 /α-FeOOH had higher photocatalytic activity on photocatalytic degradation of fluoranthene in soil under simulated sunlight. The degradation efficiency of TiO 2 /α-FeOOH is 3.0 and 4.8 times higher than that of TiO 2 and α-FeOOH, respectively. This is attributed to enhanced photocatalytic ability by enhancing the transfer capacity of electrons and holes and broadening the spectrum absorption range. The highest degradation efficiency was achieved when the pH of the soil is neutral, the ratio of water/soil is 10:1, and the dosage of catalyst is 50 mg/g. In addition, it was proved that •O 2 − , h + , and 1 O 2 are the main active substances in the photocatalysis of TiO 2 /α-FeOOH. The possible mechanism of a Z-type electron transfer structure was also proposed. The degradation products of fluoranthene were detected, and the degradation pathway was deduced.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xue Yang,Jianjun Ma,Jing Ling,Na Li,Di Wang,Fan Yue,Shimei Xu
The cellulose acetate (CA)/SiO 2 -TiO 2 hybrid microsphere composite aerogel films were successfully fabricated via water vapor-induced phase inversion of CA solution and simultaneous hydrolysis/condensation of 3-aminopropyltrimethoxysilane (APTMS) and tetrabutyl titanate (TBT) at room temperature. Micro-nano hierarchical structure was constructed on the surface of the film. The film could separate nano-sized surfactant-stabilized water-in-oil emulsions only under gravity. The flux of the film for the emulsion separation was up to 667 L m −2 h −1 , while the separation efficiency was up to 99.99 wt%. Meanwhile, the film exhibited excellent stability during multiple cycles. Moreover, the film performed excellent photo-degradation performance under UV light due to the photocatalytic ability of TiO 2 . Facile preparation, good separation and potential biodegradation maked the CA/SiO 2 -TiO 2 hybrid microsphere composite aerogel films a candidate in oil/water separation application.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Xiangchen Kong,Huiming Huang,Zhaoyang Li,Yanqin Liang,Zhenguo Li,Shengli Zhu
TiO 2 (B) nanosheets/GO (graphene oxide) hybrids are considered to be outstanding performance photocatalysts for high efficiency of H 2 evolution. However, they still suffer severe challenges during the synthetic processes, such as a large amount of the capping agents adhering on the surface and easy occurrence of aggregation. To figure out these obstacles, Ar plasma treatment as a modified method in this study not only enable the TiO 2 (B) nanosheets distributed uniformly on the GO sheets but also engineer defects within TiO 2 (B) nanosheets to significantly improve the photocatalytic activity for the water splitting. The hydrogen evolution rate of the TiO 2- x (B)/GO sheets is 1.4 times higher compared with that of original TiO 2 (B)/GO sheets without Ar plasma treatment. The improved photocatalytic properties were owing to the synergetic effects of oxygen vacancies and the heterojunction between GO and TiO 2 (B), which can promote the visible light utilization and accelerate separation and transportation of photogenerated electron-holes. This study can provide a facile pathway to prepare the two-dimensional hybrid photocatalysts with high photocatalytic H 2 activity.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Honggen Peng,Jiawei Ying,Jingyan Zhang,Xianhua Zhang,Cheng Peng,Cheng Rao,Wenming Liu,Ning Zhang,Xiang Wang
Catalytic oxidation of formaldehyde (HCHO) is the most efficient way to purify indoor air of HCHO pollutant. This work investigated rare earth La-doped Pt/TiO 2 for low concentration HCHO oxidation at room temperature . La-doped Pt/TiO 2 had a dramatically promoted catalytic performance for HCHO oxidation. The reasons for the La promotion effect were investigated by N 2 adsorption, X-ray diffraction, CO chemisorption , X-ray photoelectron spectroscopy, transmission electron microscopy (TEM) and high-angle annular dark field scanning TEM . The Pt nanoparticle size was reduced to 1.7 nm from 2.2 nm after modification by La, which led to higher Pt dispersion, more exposed active sites and enhanced metal-support interaction. Thus a superior activity for indoor low concentration HCHO oxidation was obtained. Moreover, the La-doped TiO 2 can be wash-coated on a cordierite monolith so that very low amounts of Pt (0.01 wt%) can be used. The catalyst was evaluated in a simulated indoor HCHO elimination environment and displayed high purifying efficiency and stability. It can be potentially used as a commercial catalyst for indoor HCHO elimination.
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高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Xiang Guo,Lei Rao,Peifang Wang,Chao Wang,Yanhui Ao,Tao Jiang,Wanzhong Wang
TiO 2 films have received increasing attention for the removal of organic pollutants via photocatalysis . To develop a simple and effective method for improving the photodegradation efficiency of pollutants in surface water , we herein examined the preparation of a P25-TiO 2 composite film on a cement substrate via a sol–gel method. In this case, Rhodamine B (RhB) was employed as the target organic pollutant. The self-generated TiO 2 film and the P25-TiO 2 composite film were characterized by X-ray diffraction (XRD), N 2 adsorption/desorption measurements, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and diffuse reflectance spectroscopy (DRS). The photodegradation efficiencies of the two films were studied by RhB removal in water under UV (ultraviolet) irradiation. Over 4 day exposure, the P25-TiO 2 composite film exhibited higher photocatalytic performance than the self-generated TiO 2 film. The photodegradation rate indicated that the efficiency of the P25-TiO 2 composite film was enhanced by the addition of the rutile phase Degussa P25 powder. As such, cooperation between the anatase TiO 2 and rutile P25 nanoparticles was beneficial for separation of the photo-induced electrons and holes. In addition, the influence of P25 doping on the P25-TiO 2 composite films was evaluated. We found that up to a certain saturation point, increased doping enhanced the photodegradation ability of the composite film. Thus, we herein demonstrated that the doping of P25 powders is a simple but effective strategy to prepare a P25-TiO 2 composite film on a cement substrate, and the resulting film exhibits excellent removal efficiency in the degradation of organic pollutants.
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高影响因子
International Journal of Refrigeration
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2017
·
IF 2.779
Lingnan Lin,Hao Peng,Zheng Chang,Guoliang Ding
The application of nanorefrigerant–oil mixture in refrigeration system requires continuous circulation of nanoparticles; however, only a small part of nanoparticles circulate by migration from the mixture to vapor within refrigerant dryout process. This study points out a more important nanoparticle circulation way by migration from bulk refrigerant–oil mixture to oil excess layer, and quantitatively evaluate the mixture-to-oil migration ratio affected by oil mass fraction, nanoparticle mass fraction and heat flux. The nanorefrigerant–oil mixture is TiO 2 /R141b/NM56; experimental conditions cover oil mass fraction of 5%–20%, nanoparticle mass fraction of 0.2%–1.0%, and heat flux of 10–100 kW m −2 ; the mixture-to-oil migration ratio is measured by absorbance method. The results show that mixture-to-oil migration ratio ranges within 0.388–0.969, and increases averagely by 51.8%, 28.3% and 8.0% with increasing oil mass fraction, reducing nanoparticle mass fraction and lowering heat flux over the whole range of present conditions, respectively.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hangyu Gu,Hongkang Wang,Rong Zhang,Tianhao Yao,Ting Liu,Jinkai Wang,Xiaogang Han,Yonghong Cheng
Lithium–sulfur (Li–S) batteries as among the most promising energy storage devices possess high theoretical capacity and energy density but suffer from the polysulfide dissolution, which hinders their practical application. Herein, we present a facile synthesis of hollow carbon nanoballs (HCNBs) anchored with ultrafine TiO2 nanoparticles (TiO2@HCNBs) in which the HCNBs with hollow interiors and graphitic crystallization accommodate the volume expansion of sulfur upon lithiation and improve the cathode conductivity, while the TiO2 nanoparticles effectively trap the polysulfides through strong chemical bonding. Notably, the S@TiO2@HCNBs with a high sulfur loading of ∼73 wt % demonstrate superior cycle performance at 0.5 C over 600 cycles with a slow capacity decay and deliver high specific capacities of 1217, 1013, 893, and 773 mA h/g at 0.1, 0.2, 0.5, and 1 C, respectively. The adsorption test clearly reveals the efficient suppression of the polysulfide shuttling owing to the spatial and chemical confinement of the TiO2@HCNBs host.
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高影响因子
INTEGRATED FERROELECTRICS
·
2022
·
IF 0.836
Wenhua Wang,Chengcai Li,Wenyu He,Guojin Liu,Caihong Lei,Hailin Zhu,Yuan Yu
In this work, antibacterial and antifouling properties Polyvinylidene fluoride (PVDF) composite membranes were prepared via nonsolvent-induced phase separation of PVDF and Zn@TiO2 blending. The Zn@TiO2 nanoparticle was successfully prepared by the sol-gel method, and then Zn@TiO2 was used to modify the PVDF membrane to obtain higher water flux and antibacterial and antifouling properties. The PVDF composite membrane was systematically characterized through a series of analysis techniques, such as scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, the water contact angle, pure water flux, tensile strength, porosity, antibacterial property and stain resistance of the membrane have been studied. Escherichia coli and Staphylococcus aureus were used to evaluate the antibacterial performance of the membrane, and the BSA was selected as a model organic pollutant to study the antifouling performance of the membrane. Results show that the PVDF composite membranes have excellent antibacterial properties (nearly 100%), high permeability (up to 433.69 L m−2 h−1) and mechanical strength (enhanced by 26.5%). It can be used for possible complex high-protein wastewater treatment without facing serious biological pollution problems, and has broad application prospects.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
He Guo,Nan Jiang,Huijuan Wang,Kefeng Shang,Na Lu,Jie Li,Yan Wu
Herein, pulsed discharge plasma (PDP) was coupled with reduced graphene oxide (rGO)/TiO 2 nanocomposites to degrade flumequine (FLU) in water. The rGO/TiO 2 nanocomposites were prepared by hydrothermal method, which were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM) and nitrogen adsorption apparatus. The characteristic results showed that the rGO/TiO 2 nanocomposites could be synthesized successfully. The rGO/TiO 2 nanocomposites had a larger specific surface area than pure TiO 2 . The degradation performance indicated that the removal efficiency could reach 99.4% with 60 min treatment in PDP-rGO/TiO 2 system, which was higher than in sole PDP system (64.8%) and PDP-TiO 2 system (75.7%). Moreover, compared to pure TiO 2 , the kinetic constant, TOC removal, synergistic factor and energy efficiency could be also improved when rGO/TiO 2 nanocomposites were added into PDP system . Besides, the effect of catalyst dosage, peak voltage, air flow rate and solution pH on FLU removal efficiency was investigated. Subsequently, response surface methodology (RSM) was adopted to inspect the interactional influences between catalyst dosage, peak voltage, air flow rate and solution pH, and the optimal parameters based on the result of single factor experiments. No matter reaction system was PDP system or PDP-rGO/TiO 2 system, the O 3 and OH concentration in deionized water were higher than that in FLU solution, suggesting that O 3 and OH played major role in degrading FLU. The addition of rGO/TiO 2 could consume O 3 and lead to more OH generation, which accelerated the degradation of FLU. The decline of pH value and the rise of conductivity deduced that many acid substances could be produced during FLU degradation, which could be mineralized into CO 2 and H 2 O ultimately.
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高影响因子
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