Advanced Composites and Hybrid Materials
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2020
·Vol. 3
·期 3
·402-414
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IF 0
Liu Chao,Lin Yang,Dong Yufei,Wu Yingke,Bao Yan,Yan Hongxia,Ma Jianzhong
In this paper, a novel Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was fabricated via a facile method of hydrothermal and calcination, and then the water treatment performance of it was evaluated for methylene blue (MB) and Escherichia coli removal. The as-prepared Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), UV–visible diffuse reflection spectroscopy (DRS), molecular dynamics simulation, and gas chromatography–mass spectrometry (GC-MS). All data revealed that the Ag/TiO 2 /graphene nanocomposite showed a rich cell structure. The photocatalytic activity of Ag/TiO 2 /graphene nanocomposite is higher than those of pristine TiO 2 nanosheets and TiO 2 /graphene nanocomposite. Under optimized conditions, the degradation efficiency was 100% and 71% for MB (30 mg/L) and with 10 mg Ag/TiO 2 /graphene nanocomposite under UV and visible light irradiation for 2 h, respectively. Ag/TiO 2 /graphene also showed excellent bacteria-killing activity. Meanwhile, the Ag/TiO 2 /graphene nanocomposite exhibited microstructure stability and cyclic stability. The water treatment performance was enhanced mainly attributed to the excellent adsorption performance of graphene and the high efficiency in separation of electron–hole pairs induced by the remarkable synergistic effects of TiO 2 , Ag, and graphene. On the basis of the experimental results, the photocatalytic mechanism and MB degradation mechanism were proposed. It is hoped that our work could avert the misleading message to the readership, hence offering a valuable source of reference on fabricating composite photocatalyst with stable microstructure and excellent performance for their application in the environment clean-up.
Graphical abstract
研究领域:
材料科学
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环境科学
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PubMed
Chemistry-An Asian Journal
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2019
·Vol. 14
·期 9
·1557-1569
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IF 3.698
Xiaoyan Wang,Dong Zhao,Chao Wang,Yonggao Xia,Wenshuai Jiang,Senlin Xia,Shanshan Yin,Xiuxia Zuo,Ezzeldin Metwalli,Ying Xiao,Zaicheng Sun,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
Graphical The Matrix Reloaded 2 : In situ synthesized super-small TiO 2 and nickel nanoparticles uniformly embedded in the carbon matrix effectively improve the electrochemical performance as both lithium-ion and sodium-ion battery anodes due to a significantly enhanced charge-carrier mobility by the nickel nanoparticles. Super-small sized TiO 2 nanoparticles are in situ co-composited with carbon and nickel nanoparticles in a facile scalable way, using difunctional methacrylate monomers as solvent and carbon source. Good control over crystallinity, morphology, and dispersion of the nanohybrid is achieved because of the thermosetting nature of the resin polymer. The effects of the nickel nanoparticle on the composition, crystallographic phase, structure, morphology, tap density, specific surface area, and electrochemical performance as both lithium-ion and sodium-ion battery anodes are systematically investigated. It is found that the incorporation of the in situ formed nickel nanoparticles with certain content effectively enhances the electrochemical performance including reversible capacities, cyclic stability and rate performance as both lithium-ion and sodium-ion battery anodes. The experimental I-V profiles at different temperatures and theoretical calculations reveal that the charge carriers are accumulated in the amorphous carbon regions, which act as scattering centers to the carriers and lower the carrier mobility for the composite. With increasing nickel content, the mobility of the charge carriers is significantly increased, while the number of the charge carriers maintains almost constant. The nickel nanoparticles provide extra pathways for the accumulated charge, leading to reduced scatterings among the charge carriers and enhanced charge-carrier transportation.
研究领域:
材料科学
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电化学
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能源存储
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2014
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IF 3.163
Bin Xia,Bijuan Chen,Xuemei Sun,Keming Qu,Feifei Ma,Meirong Du
The toxicity of TiO 2 engineered nanoparticles (NPs) to the marine microalga Nitzschia closterium was investigated by examining growth inhibition, oxidative stress and uptake. The results indicated that the toxicity of TiO 2 particles to algal cells significantly increased with decreasing nominal particle size, which was evidenced by the 96 EC 50 values of 88.78, 118.80 and 179.05 mg/L for 21 nm, 60 nm and 400 nm TiO 2 particles, respectively. The growth rate was significantly inhibited when the alga was exposed to 5 mg/L TiO 2 NPs (21 nm). Measurements of antioxidant enzyme activities showed that superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities were first induced and subsequently inhibited following exposure to 5 mg/L TiO 2 NPs. The depletion of antioxidant enzymes with a concomitant increase in malondialdehyde (MDA) levels and reactive oxygen species (ROS) posed a hazard to membrane integrity. A combination of flow cytometry analysis, transmission electron microscopy and Ti content measurement indicated that TiO 2 NPs were internalized in N. closterium cells. The level of extracellular ROS, which was induced by TiO 2 NPs under visible light, was negligible when compared with the intracellular ROS level (accounting for less than 6.0% of the total ROS level). These findings suggest that elevated TiO 2 nanotoxicity in marine environments is related to increased ROS levels caused by internalization of TiO 2 NPs.
研究领域:
环境科学
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毒理学
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
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2018
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IF 4.484
Huihui Liu,Zongwei Chen,Lei Zhang,Dongbo Zhu,Qun Zhang,Yi Luo,Xiang Shao
To achieve a best promotion effect of photocatalytic activity, an optimized interface between graphene and TiO2 is highly desirable, which is, however, difficult to realize via conventional preparation of the graphene/oxide composites. To this end, we here develop a novel strategy to directly grow graphene on the anatase-TiO2 (a-TiO2) nanosheet via an ambient pressure chemical vapor deposition (AP-CVD) method using acetylene as the precursor. Such a recipe successfully avoids the intercalating contaminations, meantime ensures the contact uniformity of graphene over a-TiO2 (G/a-TiO2). The ultrafast transient absorption spectroscopy clearly reveals the efficient charge transfer from TiO2 to graphene in assisting the separation of photoinduced electron–hole pairs. Moreover, the measurements of photocurrent and the photocatalytic degradation of methyl orange turn out that the composite with double layer graphene shows the best performance, which can possibly result from the competition of interlayer interactions within the multilayer graphene and the interactions between graphene with TiO2.
研究领域:
材料科学
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环境科学
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物理化学
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 40
·33705-33712
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IF 3.289
Weiping Zhang,Xinyan Xiao,Yang Li,Xingye Zeng,Lili Zheng,Caixia Wan
Layered metal sulphides (LMSs) such as MoS2, WS2 and SnS2 have attracted much attention in the field of photocatalysis due to their excellent properties. Herein, a facile and effective liquid exfoliation solvothermal method for fabricating TiO2/LMS (LMS = MoS2, WS2 or SnS2) photocatalysts has been developed. The optimum molar ratio of Ti–Mo, Ti–W and Ti–Sn was determined to be 50 : 0.8, 50 : 0.1 and 50 : 0.1, respectively. The optical properties of TiO2/LMS with a matching solar spectrum contribute to converting the solar energy to chemical energy by photon-driven photocatalytic reactions. The combined effect of liquid exfoliation and solvothermal reforming has been demonstrated as an effective method to obtain high efficiency photocatalysts using bulk metal sulphides as sensitizers. The binding site of TiO2 and the LMS at the interface of a composite photocatalyst was investigated by the density functional theory (DFT) method at a molecular cluster level, and the calculation results showed that firm structures were formed at the interfaces of TiO2 nanoparticles and the LMS. The photocatalytic activity evaluation of TiO2/LMS showed that the LMS played the crucial role in separation of photogenerated e−/h+ pairs and utilization of photons for enhancing the photocatalytic activity of TiO2. The study of the electron transfer mechanism indicated that the synergetic effect of superoxide radicals (·O2−) and hydroxyl radicals (·OH) plays the leading role in the dye degradation process.
研究领域:
材料科学
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环境科学
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理论化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Lei Chen,Wenting Sun,Zhiying Xu,Minghui Hao,Baojing Li,Xin Liu,Jingjing Ma,Liang Wang,Chunhu Li,Wentai Wang
Low-temperature electrocatalytic reduction of nitric oxide (NORR) is promising for the low-cost, high-efficiency removal and utilization of nitric oxide (NO), which couples the two crucial industrial processes of denitration and synthetic ammonia. We reported a binary catalyst of Cu/P–TiO 2 for NORR process, which took advantages of the Cu electrocatalysts and porous TiO 2 . The increase of surface areas and channels can improve the adsorption of NO molecules. The decoration of the ultrafine Cu nanoparticles on the porous TiO 2 may prevent the agglomeration of ultrafine Cu nanoparticles. The as-prepared Cu/P–TiO 2 electrode exhibits excellent electrocatalytic activity with a Faraday efficiency of 86.49% and NH 3 yield of 3520.80 μg·h −1 ·mg −1 in 0.1 M K 2 SO 4 at −0.3 V vs. RHE. The mechanism of the NORR reaction process with Cu/P–TiO2 catalysts was also discussed. This research may broaden the application areas of TiO 2 -based materials in the electrocatalysis and provide a new sight in the treatment of NO pollutants.
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
Materials
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2021
·Vol. 14
·期 20
·6038
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IF 3.623
Huan Shuai,Yuxin Wang,Jiao Wang,Gaoxiang Du,Daimei Chen,Yu Liang
In this paper, a TiO2/black talc composite photocatalyst was prepared by the sol-gel method using TBOT as titanium source and black talc as carrier. Rhodamine B was used as the targeted pollutant to study the adsorption role of carbon in black talc. The results showed that with the adsorption-degradation cycles, the illumination time can be reduced by 40%. The adsorption rate and degradation rate of the composite photocatalyst was also increased. The degradation rate of Rhodamine B reached more than 95%, which fully shows the synergistic effect between TiO2nanoparticles and black talc. In this way, the adsorption-degradation coupling of the photocatalyst could be realized.Keywords:nano-TiO2particles;black talc;characteristic adsorption;photodegradation;synergistic effect
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2023
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IF 2.2
Hongye Bai,Lihao Yu,Jinfu Xu,Xuliang Pang,Yajie Bai,Jianguo Cui,Weiqiang Fan
Decoration of metal-organic framework (MOF) has been considered as an effective route to improve the photoelectrochemical (PEC) performance of TiO 2 , but there is still a lack of understanding of the regulatory structure. Herein, Ni-MOF was rationally introduced by in-situ etching method, which helps for artificially regulating the coordination state of Ni sites. The photocurrent density (0.81 mA/cm 2 ) and IPCE value (33.1%) of TiO 2 -MOF-2 are about twice higher than that of pristine TiO 2 due to the rich unsaturated sites of Ni-MOF. Meanwhile, the saturated coordination has caused the decline of PEC performance because of the obvious steric hindrance . Therefore, this work presents an insight for the effect of coordination state on PEC activity especially in MOF system.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Haibo Yin,Junyang Zhang,Yunlong Wang,Xiaoguang Zhao,Yakun Qu,Yue Peng,Hexing Li,Yuning Huo,Junhua Li
Photocatalytic membrane reactor (PMR), coupling photocatalysis and membrane separation , has shown a considerable potential in foulant removal. However, the serious membrane fouling and fragile membrane stability still limit the application of current PMR systems. Here, we report a strategy that PdCu alloy deposited on TiO 2 , which is incorporated with polyvinylidene fluoride membrane, achieves high humic acid (HA) rejection efficiency (100%) with enhanced membrane permeation and anti-fouling performance. Detailed characterizations demonstrate that alloying effect of PdCu-TiO 2 plays multiple roles in improving PMR performance: (1) providing the paired Pd-Cu sites for enhancing HA adsorption and transferring electrons from Pd-Cu sites to HA to improve photocatalytic HA removal; (2) inducing the photothermal effect due to the carrier damping, which directly enhances membrane permeation. The remarkable properties of PdCu-TiO 2 membrane in PMR confirm the significance of alloying effect for treating aqueous organic pollutants .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yanhua Li,Guolong Ni,Kuo Zhang,Dongjia Wang,Qun Li,Shuhuan Wang
Herein, the 3D N-doped Ti 3 C 2 /TiO 2 sphere structure is constructed via an innovative three-step method including the preparation of 3D Ti 3 C 2 microspheres with PMMA as templates, the situ-growth of TiO 2 nanoparticles on Ti 3 C 2 and the subsequent annealing treatment in NH 3 . N element is doped in composite after annealing in NH 3 to improve the transfer rate of ions and electrons, and N-doped Ti 3 C 2 /TiO 2 hollow composite provides an abundant active surface for the sufficient contact between electrodes and electrolytes to enhance charge transport and electrolyte diffusion. Benefiting the unique structure feature and the synergistic effects of active materials, the N-doped Ti 3 C 2 /TiO 2 electrode exhibits a high specific capacitance of 572 F g −1 at a current density of 1 A g −1 and a superior cyclic stability of 99.6% of its initial value for 9500 cycles at 10 A g −1 . Based on this, a symmetric supercapacitor (SSC) based on N-doped Ti 3 C 2 /TiO 2 electrode is further assembled. The SSC shows a competitive capacitance of 157 F g −1 at 1 A g −1 . More importantly, the comparable energy density of 17.7 Wh kg −1 is achieved at the power density of 450 W kg −1 . This work will give promising guidance for designing and fabricating the durable electrodes with excellent electrochemical behavior for practical application in future.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Junhao Cai,Yaru Peng,Po Hu,Yuan Zhou,Qiaoge Yao,Hao Lyu,Youtang Gao
The light absorption, active sites, and charge carriers separation of photocatalysts are extremely important factors in the field of photocatalysis. Near-perfect lattice-matched homojunction constructed using disorder engineering and doping strategies is an effective strategy to improve photocatalytic activity. Herein, we developed crystalline TiO 2 nanoparticles (NPs) and Ti 3 C 2 T x MXene-derived C-doped amorphous TiO x homojunction (TCT) at room temperature. In this homojunction, TiO 2 NPs are evenly distributed on the surface of the C-TiO x nanosheet to form a type-II structure, which promotes the separation of photogenerated carriers. The light absorption range of TCT extends to 550 nm due to the presence of intermediate energy levels in C-TiO x , which increases its photon absorption capacity. Moreover, TCT possesses a large number of oxygen vacancies, which are beneficial for improving the adsorption and degradation of pollutants. These characteristics of TCT could significantly improve its photodegradation performance for tetracycline. Interestingly, the precursor mass ratio of TCT with the best degradation efficiency is different under different illumination conditions, which is attributed to the different band gaps of C-TiO x and TiO 2 NPs resulting in different light absorption ranges. This work provides a new approach to rationally designing crystalline and amorphous homojunction for photocatalytic applications.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 5
·6682-6687
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IF 2.478
Liu Zhenjie,Huang Yudai,Wang Xingchao,Zhang Yue,Ding Juan,Guo Yong,Tang Xincun
High performance and low process cost are two contradictory issues, which limited the commercial application of Li 4 Ti 5 O 12 (LTO). Here, defects and TiO 2 co-enhanced LTO have been synthesized by a simple solid-state method. The crystal structure and morphology of the as-synthesized samples were characterized. The results show that the uniform nanoparticles with spinel structure contained defects and TiO 2 . Defects and TiO 2 co-enhanced LTO shows outstanding reversible discharge capacity of 168.2 mAh g −1 at 1 C after 500 cycles. Further, it presents a stability discharge ability of 155 mAh g −1 at 55 °C at 1 C after 500 cycles. The advanced electrochemical performance could be attributed to the defects and TiO 2 in LTO, which enhance conductivity and produce rich reaction interface, facilitating Li + ion diffusion kinetics. The as-synthesized LTO shows high performance in conjunction with low process cost.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）