PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2016
·Vol. 92
·期 4
·515-522
·
IF 2.008
Yanmei Luo,Yiru Jia,Dexian Zhang,Xinjian Cheng
TiO 2 /PVA composite nanofiber mat was prepared via an electrospinning technology. SH-TiO 2 -SiO 2 hybrid particles and PVA solution were injected through a coaxial syringe, yielding a composite nanofiber mat. The as-prepared SH-TiO 2 -SiO 2 /PVA composite nanofiber mat was immersed in Cd 2+ cation solution and S 2− anion solution in turn. Thus, yellow TiO 2 @CdS/PVA composite nanofiber mats were prepared. By adjusting the number of times a mat was immersed in the Cd 2+ and S 2− solutions, different amounts of CdS particles attaching to the mats were obtained. Both SH-TiO 2 -SiO 2 /PVA and TiO 2 @CdS/PVA composite nanofiber mats were employed to catalyze the photodegradation of a model dye, methylene blue. The photodegradation performance could be greatly enhanced by the introduction of CdS particles anchoring onto TiO 2 particles. The photodegradation efficiency reached 99.2% within 180 min. Also, the nanofiber mat could be recycled and reused at least 10 times. The photodegradation efficiency of TiO 2 @CdS/PVA composite nanofiber mats remained 68.8% for 10 cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 63
·33408-33415
·
IF 3.708
Fang Cui,Linxu Xu,Tieyu Cui,Tongjie Yao,Jing Yu,Xiao Zhang,Kening Sun
In this paper, we demonstrate a facile and scalable route to the preparation of composites containing ultrasmall TiO2 nanocrystals and porous carbon matrix. In this method, the titanium ions are covalently introduced to polymer chains and transformed into TiO2 nanocrystals directly in solid matrices, which allows the generation of well dispersed TiO2 nanocrystals with small size in the entire carbon matrix. To our knowledge, this is the first time that ultrasmall TiO2 nanocrystals are incorporated into a bulk porous carbon matrix. In comparison with pure TiO2 particles, the composites exhibit significant improvement in photocatalytic degradation of methyl blue under visible light irradiation, which might be attributed to the ultrasmall size of TiO2 nanocrystals as well as the high separation efficiency of photogenerated electrons and holes based on the synergistic effect between TiO2 nanocrystals and carbon matrices. Furthermore, the composites could be easily recycled without obvious activity loss.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2013
·
IF 1.527
Yan-Fang Li,Wen-Pei Zhang,Xiangru Li,Ying Yu
Particular TiO 2 nanoparticles with high selective photocatalytic oxidation of anionic dyes are prepared by a feasible hydrothermal method . Moreover, its photocatalytic selectivity can be easily switched to cationic dyes by a simple post-treatment in ammonia solution, which makes the prepared TiO 2 have bi-directional selectivity in dye photodegradation. Based on the photocatalytic performances and the structure and surface characteristics of the catalyst, the bi-directional selectivity of the catalysts is found to be closely related to the adsorption selectivity. The adsorption selectivity originates from surface charge groups, which are introduced during the preparation and post-treatment progresses. This study provides a facile and economical approach towards selective degradation of dyes with high efficiency by the special TiO 2 nanoparticles synthesized through a simple hydrothermal method , which may be used practically in the future.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 10
·3486-3495
·
IF 4.052
Juying Lei,Bin Chen,Weijia Lv,Liang Zhou,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
A TiO2/g-C3N4 composite photocatalyst with an inverse opal structure and heterojunction has been successfully prepared by a relatively facile approach. The catalyst was characterized by a combination of XRD, SEM, HRTEM, XPS, PL, EIS and DRS techniques and applied for the photocatalytic degradation of organic pollutants represented by Rhodamine B, phenol and levofloxacin. The results of RhB degradation showed that the rate constant of inverse opal TiO2/g-C3N4 with the best compound ratio is 0.184 min−1, which is 2.7 times faster than that of normal TiO2/g-C3N4 and 4.2 times faster than that of inverse opal TiO2. The enhancement of photocatalytic activity may be attributed to the matched overlapping band structure and the interaction between inverse opal g-C3N4 and TiO2. The inverse opal structure of g-C3N4 has improved the optical absorption properties of g-C3N4 and the interaction between inverse opal g-C3N4 and TiO2 creates more interfaces for the efficient transfer of photogenerated electron–hole pairs to restrict the recombination, which was proved from the photoluminescence spectra (PL). Moreover, a possible photocatalytic mechanism has been tentatively proposed according to the experimental results. All in all, both the inverse opal structure and heterojunction construction play significant roles in the excellent photocatalytic degradation performance according to the mechanism investigation.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Kexin Zhang,Jie Song,Ce Liang,Kaifeng Yu
To overcome the performance bottleneck caused by the single-structure optimization of TiO 2 -based anode materials and to explore a new approach for the resource utilization of agricultural waste, this study synthesized nano-TiO 2 particles (TiO 2 -NP) via a co-precipitation and hydrothermal method. Porous carbon spheres (CSHC) were prepared using discarded corn stalk pith as a carbon source through a hydrothermal carbonization and high-temperature calcination coupling process. Subsequently, TiO 2 -NP was in situ grown onto CSHC, forming a nano-TiO 2 /corn stalk pith carbon sphere composite material (TiO 2 -NP/CSHC), thereby achieving the synergistic enhancement of nano-TiO 2 and biomass-derived carbon. This design not only alleviates the agglomeration of TiO 2 but also significantly enhances the electrochemical performance of the composite material via a three-dimensional conductive carbon network. The prepared TiO 2 -NP/CSHC exhibits a high specific surface area of 101.2 m 2 g −1 and a well-developed porous structure, delivering excellent lithium and sodium storage performance as an anode material for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). At a current density of 0.2C, after 100 cycles, the discharge specific capacities were maintained at 1182.5 mA h g −1 and 675.3 mA h g −1 , respectively. Through the structural and functional synergy of TiO 2 -NP and CSHC, the composite material simultaneously achieves high capacity, long cycling stability, and fast charge/discharge capability, while also offering environmental sustainability and cost-effectiveness.
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
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环境可持续性
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 49
·495704
·
IF 2.9
Gang Xiao,Zishuai Wang,Yu Jin,Fengping Wang
The selective cleavage of lignin C–C bonds is a highly sought-after process with the goal of obtaining low-molecular-weight aromatic chemicals from renewable resources. However, it remains a challenging task to achieve under mild conditions. Photocatalysis is a potentially promising approach to address this issue, but the development of efficient photocatalysts is still in progress. In this study, we introduce the heterostructured TiO2@g-C3N4 photocatalyst for the development of a visible light photocatalytic procedure for the selective cleavage of lignin C–C bonds under mild conditions. The photocatalyst displays favourable visible light absorption, efficient charge separation efficiency, and promising reusability. A typical β–O–4 dimer model, 2-phenoxy-1-phenylethanol, was effectively (96.0% conversion) and selectively (95.0 selectivity) cleaved under visible light at ambient conditions. This photocatalytic procedure was also effective when subjected to solar irradiation or other lignin dimer models with β–O–4 or β-1 linkages. This reaction occurred through a Cβ-centred radical intermediate and a six-membered transition state with photogenerated holes as the primary active species. The Cα–OH oxidative dehydrogenation of the substrate could also take place but was a relatively minor route. This study provides a new photocatalytic procedure for visible-light-driven lignin valorisation and sheds light on the design of high-performance nanocomposite photocatalysts for C–C bond cleavage.
研究领域:
化学工程
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材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Junjie Ma,Yingguan Xiao,Juanrong Chen,Yue Shen,Sisi Xiao,Shunsheng Cao
Exploring high-performance photocatalysts still remains a big challenge due to poor charge separation efficiency. Herein, we prepare a novel anatase/rutile TiO 2 -Ag 3 PO 4 hollow photocatalyst (A/R-TiO 2 -Ag 3 PO 4 ) for addressing this challenge. Microstructural characterization and photoelectric measurements confirm that the synergy of hollow structure and dual-heterojunction can provide abundant active sites and boost efficient charge separation through dual-pathway charge transfer mechanism. The A/R-TiO 2 -Ag 3 PO 4 photocatalyst exhibits the highest photocurrent density (15.25 µA cm −2 ), which is 8.4 and 5.2 times than that of A-TiO 2 -Ag 3 PO 4 (1.82 µA cm −2 ) and P25-Ag 3 PO 4 (2.93 µA cm −2 ), respectively. Photo-degradation experiment shows that A/R-TiO 2 -Ag 3 PO 4 presents a high degradation percentage (98.7 %) of thiamethoxam (THX) within 30 min, which is 1.45 and 1.23 times than that of A-TiO 2 -Ag 3 PO 4 (68.1 %) and P25-Ag 3 PO 4 (80.7 %), respectively. Furthermore, the degradation percentage of THX by A/R-TiO 2 -Ag 3 PO 4 is as high as 96.4 % after seven successive cycles, indicating excellent cycling stability. Therefore, this work provides a new insight into exploring other high-performance photocatalysts by combining hollow structure and dual-heterojunction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Tian,Shuhao Qin,Jingkui Yang,Xiao Wu,Jing Zhang,Jianxin Li,Hong Wang,Zhenyu Cui
PVDF/TiO 2 @CQDs hybrid photocatalytic thin films were prepared by ink-jet printing. The printing ink was prepared with the TiO 2 , TiO 2 (s)@CQDs (surface composite), and TiO 2 (i)@CQDs (situ doping) nanoparticles as precursors, respectively. Compared to TiO 2 (s)@CQDs, TiO 2 (i)@CQDs has a smaller particle size (about 10.01 nm) and a narrower particle size distribution (6∼14 nm), which can improve the photocatalytic effect while avoiding nozzle clogging. The PVDF/TiO 2 (i)@CQDs hybrid film exhibited a high degradation efficiency ( η ) of 93.71 % for Rhodamine B (RhB) within 150 min under visible light with a catalyst load of only 0.49 wt%. The reaction rate constant ( ks ) of the PVDF/TiO 2 (i)@CQDs film was about 4.3 times higher than that of the PVDF/TiO 2 (s)@CQDs film. The small particle size of this S-scheme TiO 2 (i)@CQDs heterostructure nanoparticle and the more effective contact interface formed between TiO 2 and carbon quantum dots (CQDs) further facilitated electron transfer and enhanced photoactivity. The firmly immobilized catalysts on the Polyvinylidene fluoride (PVDF) film substrate through Ti-F coordination bonds ensured the reusability and stability of the photocatalytic film (the η of RhB still reached 88.05 % after 10 consecutive cycles). This work provides a new strategy for the application of ink-jet printing technology in photocatalysis.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Muhan Cao,Peifang Wang,Yanhui Ao,Chao Wang,Jun Hou,Jin Qian
A magnetically separable graphene–TiO 2 (MG–TiO 2 ) hybrid photocatalyst was successfully prepared by a one step method. Namely, simultaneous reduction of graphene oxide and deposition of TiO 2 on the graphene was occurred in one single process. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) analysis, X-ray photoelectron spectroscopy (XPS) and The Brunauer–Emmett–Teller (BET) analysis. The photocatalytic activity of the obtained samples was measured by the decomposition of methylene blue (MB) and tetrabromobisphenol A (TBBPA, a brominated flame retardant) under UV light irradiation. The results showed that MG–TiO 2 exhibited much higher photocatalytic performance than that of bare TiO 2 . The enhanced activity can be ascribed to the incorporation of graphene. In addition, the MG–TiO 2 with MG content of 3% exhibited the highest activity towards MB and TBBPA degradation. The intermediates of TBBPA in the photocatalytic degradation process were analyzed by LC–MS. On the basis of the identified intermediates, the photocatalytic degradation pathway of TBBPA was proposed. Furthermore, the recyclable ability of the samples was also studied and the results showed that the samples exhibited high stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Lei Chen,Zhouyi Xiong,Hanguo Xiong,Zhenjiong Wang,Zia-ud Din,Asad Nawaz,Pengkai Wang,Chun Hu
The nano-TiO 2 was utilized to improve the bonding performance, structure stability and film-forming properties of renewable starch-based wood adhesive. The results showed that 4% nano-TiO 2 (nano-TiO 2 :starch, w;w) resulted in 6.5 MPa of shear strength and 6437 Pa.s of viscosity. The thermal stability was measured by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Additionally, low-field nuclear magnetic resonance (NMR) and rheological results exhibited the enhancement of nano-TiO 2 on the pseudoplasticity and structure which determined the state and migration of water. Besides, the structural characterization of copolymer was analyzed via fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD). Furthermore, the film-forming property was evaluated by small angle X-ray scattering (SAXS) and dynamic mechanical analysis (DMA). The morphological structures of adhesive were observed by scanning electron microscopy (SEM). In conclusion, the 4% nano-TiO 2 (nano-TiO 2 :starch, w;w) can be employed to prepare starch-based wood adhesives with superior properties for wood application.
研究领域:
材料科学
·
木材科学与技术
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yuanzhen He,Dengjie Zhong,Yunlan Xu,Ran Jiang,Jiayou Zhang,Pengfei Liao
A La-doped Ti/SnO2-Sb2O4 electrode with TiO2-NTs intermediate layer (Ti/TiO2-NTs/SnO2-Sb2O4-La) was created via the electrodeposition technique. The physicochemical and electrochemical properties of the electrode were analyzed through FESEM, XRD, XPS, CV, and LSV electrochemical tests. The results showed that TiO2-NTs were tightly packed on the surface of Ti substrate, thus improving the binding force of the SnO2-Sb2O4-La coating, offering greater specific surface area, more active spots, higher current response, and longer lifespan for the degradation of rhodamine B. The lifespan of the Ti/TiO2-NTs/SnO2-Sb2O4-La electrode reached 200 min (1000 mA cm–2, 1 M H2SO4), while the actual service life was up to 3699 h. Under the conditions of initial pH 3.0, Na2SO4 concentration of 0.1 M, current density of 30 mA cm–2, and initial rhodamine B concentration of 20 mg L–1, the color and TOC removal rate of rhodamine B reached 100% and 86.13% within 15 and 30 min, respectively. Rhodamine B was decomposed into acids, esters, and other molecular compounds under the action of •OH and SO4•– free radicals and electrocatalysis, and finally completely mineralized into CO2 and H2O. It is anticipated that this work will yield a novel research concept for producing DSA electrodes with superior catalytic efficacy and elevated stability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 8
·期 9
·4976-4983
·
IF 7.394
Fangzhi Mou,Lei Kong,Chuanrui Chen,Zhihong Chen,Leilei Xu,Jianguo Guan
In this work, water-fuelled TiO2/Pt Janus submicromotors with light-controlled motions have been developed by utilizing the asymmetrical photocatalytic water redox reaction over TiO2/Pt Janus submicrospheres under UV irradiation. The motion state, speed, aggregation and separation behaviors of the TiO2/Pt Janus submicromotor can be reversibly, wirelessly and remotely controlled at will by regulating the “on/off” switch, intensity and pulsed/continuous irradiation mode of UV light. The motion of the water-fuelled TiO2/Pt Janus submicromotor is governed by light-induced self-electrophoresis under the local electrical field generated by the asymmetrical water oxidation and reduction reactions on its surface. The TiO2/Pt Janus submicromotors can interact with each other through the light-switchable electrostatic forces, and hence continuous and pulsed UV irradiation can make the TiO2/Pt Janus submicromotors aggregate and separate at will, respectively. Because of the enhanced mass exchange between the environment and active submicromotors, the separated TiO2/Pt Janus submicromotors powered by the pulsed UV irradiation show a much higher activity for the photocatalytic degradation of the organic dye than the aggregated TiO2/Pt submicromotors. The water-fuelled TiO2/Pt Janus submicromotors developed here have some outstanding advantages as “swimming” photocatalysts for organic pollutant remediation in the macro or microenvironment (microchannels and microwells in microchips) because of their small size, long-term stability, wirelessly controllable motion behaviors and long life span.
研究领域:
纳米技术
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）