COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Zihan Yin,Yujie Shan,Mingyan Yu,Lun Yang,Jiaming Song,Peng Hu,Feng Teng
As a commonly used substrate and matrix material in the construction of high performance ultraviolet photodetector, ZnO nanorod arrays have attached much attention due to their efficiency electron transmission channels and high stability. However, they also have the problem of slow response speed inevitably. In this work, TiO 2 /ZnO nanorod arrays heterojunction structure was prepared and used to construct ultraviolet photodetector. The obtained heterojunction photodetector has a higher on/off ratio (>1000) and shorter rise/decay time (6.1/3.7 s) compared with that of photodetector based on ZnO nanorod arrays (on/off ratio ∼10 and decay time >20 s). The enhanced response speed is caused by the traps of the electron in TiO 2 layer, which can accelerate the decay of current in the OFF state. The obtained results provide a new sight for the further development of the optoelectronic devices based on ZnO nanorod arrays in future.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Kaifeng Lu,Yifan Wang,Caidi Jin,Robert Liao,Weihong Tan,Jun Ye,Lingjun Zhu,Shurong Wang
The conversion of biomass-derived monosaccharides to value-added platform compounds, regarded as the alternative biofuels precursors, has attracted increasing attention. This work provides a novel approach on developing efficient and recyclable catalyst for biorefining. Herein, a titania-supported tungstophosphoric acid (TPA-TiO2) nanocomposite catalyst with advantages in acidity flexibility and catalytic stability was proposed for the efficient dehydration of xylose to furfural. The loading of the active component of TPA played an important role in the acidity and Lewis/Brønsted acids distribution of the catalyst. The structure characterization of the catalyst showed that the TPA particles were distributed well in TiO2 support. After the optimization of catalytic reaction conditions, the xylose conversion could approach to 96.12% while the furfural yield of 76.71% was obtained at 190 °C for 60 min catalyzed by TiO2-TPA-3 in a methyl isobutyl ketone (MIBK)–water biphasic solvent system. It was still about 80% of the initial yield after the fifth recycling of the TiO2-supported heteropolyacids catalyst. Furthermore, the reaction kinetics of xylose dehydration to furfural was investigated. The catalytic system in this work had a lower activation energy for xylose dehydration, and the decrease in furfural yield was mainly caused by the side reaction of furfural with intermediates. This work provides a novel approach on developing efficient and recyclable catalyst for biorefining.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xiaotong Feng,Lifen Gu,Naiyu Wang,Qiaosheng Pu,Guangli Liu
Carbon-based adsorption and TiO 2 -based photocatalysis are both safe and low-cost ways of pollutant purification. Constructing C-TiO 2 architectures can effectively improve removal efficiency. However, most of those carbon frames only acted as supporting substrates, exhibiting rather limited synergistic action from TiO 2 and carbon. Herein, Fe/N co-doped nano-TiO 2 wrapped on mesoporous carbon spheres with a core-shell structure was designed. The Fe, N co-doped carbon sphere with a hierarchical structure improved the synergy of adsorption and transfer during the photocatalytic process. Without extra dopant, the Fe and N partly exposed on the surface realized the in-situ migrating into the TiO 2 shell to enhance the interface effect, which significantly promoted the photocatalytic efficiency of the composite. Furthermore, the photocatalytic efficiency of the composite was investigated through two typical pollutants under visible-light irradiation. The degradation efficiencies for rhodamine B and paraxylene were 96.2% in 60 min and 94.1% in 20 min, respectively, with the apparent rate constant of 0.045 min –1 and 0.049 min –1 , 8.3 and 11.4 times of that for bare TiO 2 . The composite is likely advantageous for treating diverse environmental pollutants.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52897
·
IF 3.057
Jihong Wen,Yi Cui,Dong Huang,Yan Li,Xichong Yu,Xinpeng Zhang,Xiaoyu Meng,Qiong Zhou
Nanoparticles can act as a barrier to gas penetration in the polymer matrix. However, the agglomeration of nanoparticles has a negative effect on the comprehensive properties of nanocomposites. We envisioned surface modification of 25 nm TiO 2 nanoparticles with KH550 to enable better dispersion in the polyvinylidene fluoride (PVDF) matrix and prepared PVDF/TiO 2 composites by the melt blending method. The effects of adding modified nanoparticles into the matrix on the thermodynamic, mechanical, rheological, and gas barrier properties were studied. We find that the dispersion of TiO 2 in the matrix significantly improved after modification, as observed in the SEM images. As a result, the mechanical properties of composites decreased with an increase in the content of nanoparticles, and PVDF/N-TiO 2 composites showed better mechanical and CO 2 barrier properties. The permeability coefficient of PVDF/0.5% N-TiO 2 has the lowest permeability coefficient, which is 18.30% lower than primary PVDF. At a high shear rate, the viscosity of PVDF/N-TiO 2 with 0.5% and 1.0% content decreased, and the viscosity of 1.5% ratio was higher than that of primary PVDF. PVDF/0.5% N-TiO 2 has the best comprehensive performance and also possesses the advantages of simple preparation, low cost, and ease of industrial production.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Beilei Cui,Hua Wang,Jinyu Han,Qingfeng Ge,Xinli Zhu
The relatively cheap and abundant Ni as a catalyst for hydrodeoxygenation (HDO) of biomass lignin-derived phenolics at 350 °C and atmospheric pressure suffers from unfavorable C-C hydrogenolysis toward CH 4 with a lower direct deoxygenation (DDO) activity. Herein, we demonstrate that the activity and selectively of Ni for HDO of m-cresol can be modified through the differences of strong metal-support interaction (SMSI) on anatase and rutile TiO 2 . Characterizations showed that the presence of SMSI depended strongly on the crystal phase of TiO 2 . The SMSI dominates on Ni/a-TiO 2 after reduction at 350 °C, resulting in Ni particles partially covered by a TiO x overlayer, and this overlayer became sufficiently thick at 650 °C, causing a significant reduction of CO chemisorption. Although the catalyst became selective for DDO to toluene, the overall HDO activity was significantly reduced because of excessive SMSI. In contrast, the Ni/r-TiO 2 catalyst reduced at 350 °C exhibited little SMSI and was active for C-C hydrogenolysis like a bare Ni catalyst. Increasing reduction temperature to 650 °C, the Ni/r-TiO 2 catalyst showed moderate SMSI and became selective to toluene through DDO while completely inhibited CH 4 formation. The toluene and total aromatics yields were 84.8 and 92.2%, respectively, at full conversion. More importantly, the turnover frequency for DDO (2.43 min −1 ) on the Ni/r-TiO 2 catalyst reduced at 650 °C was ∼40 and ∼14 times higher than that of Ni on rutile and anatase, respectively, reduced at 350 °C. This study provides an example of “Goldilocks principle” in catalysis, i.e., the best performing catalyst offers a balanced SMSI!
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Jinwang Li,Yingying Lin,Rong Chen,Xun Zhu,Dingding Ye,Yang Yang,Youxu Yu,Dechao Wang,Qiang Liao
All-vanadium photoelectrochemical flow cell, which combines the vanadium redox flow battery and the photoelectrochemical flow cell, is a promising technology to store solar energy in reversible redox pairs. The development of a high-performance photoanode is vital to promote the storage of solar energy. In this work, we developed a self-doped TiO 2 photoanode and applied it to a microfluidic all-vanadium photoelectrochemical flow cell (μVPFC). The self-doped TiO 2 photoanode was simply prepared by annealing the TiO 2 photoanode with NaBH 4 in the nitrogen atmosphere, by which the self-dopant led to the formation of a disordered layer on the surface and created a mid-band. As a result, the light absorption region was extended and the electron-hole pair separation efficiency was enhanced, promoting the capability of the μVPFC with the self-doped TiO 2 photoanode. The superiority of the self-doped TiO 2 photoanode was confirmed by its excellent photoelectrochemical performance and vanadium ion conversion rate. The μVPFC with the self-doped TiO 2 photoanode yielded an average photocurrent density as high as 0.064 mA·cm −2 in 6-h operation, which was much higher than the reported TiO 2 and Ti 2 O 3 photoanodes and presented the improvements by approximately 167% and 60%, respectively. In addition, intensifying the intensity of light and concentration of vanadium ion enabled the performance of the μVPFC with the self-doped TiO 2 photoanode to be promoted.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wenxiang Yang,Guozhi Ma,Yin Fu,Ke Peng,Hongli Yang,Xiaoqiang Zhan,Weiyou Yang,Lin Wang,Huilin Hou
The development of novel and efficient heterojunction photocatalysts is still a challenging issue for achieving highly efficient solar-to-chemical energy conversion. Herein, we report the construction of Ti 3 C 2 MXene@TiO 2 /CuInS 2 (M@T/CIS) integrated Schottky/step-scheme (S-scheme) heterojunction by two-step hydrothermal process for boosting photocatalytic hydrogen generation activity. The as-prepared M@T/CIS hybrid photocatalysts exhibit the synergistic effects for enhanced visible-light harvesting, improved charge transfer and increased active site for photocatalytic H 2 evolution. They deliver a H 2 evolution rate of 356.27 μmol g -1 h −1 , which is ∼ 69 and 636 times higher than those of M@T and CIS, respectively, representing their potential applications towards photocatalytic H 2 evolution.
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 20
·6038
·
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Liang,Wei Li,Xuan Wang,Run Zhou,Hao Ding
TiO 2 –ZnO/Au ternary heterojunction nanocomposite was fabricated by producing TiO 2 nanosheets first using solvent-thermal method followed by Au deposition and ZnO deposition respectively. The TiO 2 nanosheets provide a relatively large surface area for the good dispersion of ZnO nanoparticles and Au particles and sufficient contact with the medium, which contribute to the excellent photocatalytic performances of TiO 2 –ZnO/Au heterojunction composite. The phases and structures, morphologies, surface and optical properties of the ternary heterojunction composite are well-characterized. Subsequently, the photocatalytic hydrogen generation of TiO 2 –ZnO/Au is evaluated under visible light irradiation. TiO 2 –ZnO/Au ternary heterojunction composite has efficient light absorption ability and excellent performances in photocatalytic hydrogen generation (1068 μmol/g under the irradiation of visible light for 4 h) and antibacterial properties (reaching 98.2%). TiO 2 –ZnO/Au ternary heterojunction nanocomposite has a large potential to be used in areas such as interior wall coating.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Jinghui Zhan,Huayao Chen,Hongjun Zhou,Li Hao,Hua Xu,Xinhua Zhou
Nano-scale antibacterial agents have attracted enthusiastic attention due to their size-dependent qualities, effective antibacterial activity, and unique physiochemical properties, which showed great application potential in plant protection and nutrition. In this work, Mt-supported ZnO/TiO 2 nanocomposite was prepared through sol-gel assisted impregnation method, and its antibacterial activity against gram-positive bacteria ( S. aureus ) and the wettability on cucumber leaves was investigated. The results suggested that the pillaring of Mt by TiO 2 increased BET specific surface area, improved Zn-dispersion, enhanced adsorption capacity , forming an exfoliation structure of TiO 2 pillared Mt nanocomposite . Besides, Mt-supported ZnO/TiO 2 nanocomposite showed an obvious increase of antibacterial activity and wetting property over pure ZnO and Mt-supported ZnO composite due to the doping of zinc oxide by carbon atoms and the increase of exposed active sites caused by the effective dispersion of ZnO. In addition, the optimal performance was achieved for 15.04% Zn element content with the diameter of the inhibition zone was 48.53 ± 0.1 mm and the contact angle was 82.5 ± 0.2° attributed to the increased BET surface area (72.33 m 2 /g) and metal oxide interaction between TiO 2 and Zn 2+ . The relatively low cost, green and environment friendly, high antibacterial activity, and wettability of Mt-supported ZnO/TiO 2 nanocomposite offers new avenues for the antibacterial agent in the field of agriculture and crop protection.
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 4
·1245-1256
·
IF 6.177
Jie Yang,Shan Ren,Mingming Wang,Zhichao Chen,Lin Chen,Lian Liu
Ce–Ti catalysts were considered as a promising replacement for V–Ti based catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NO and NO2) with NH3. In this work, a CeO2/TiO2 catalyst was prepared by the impregnation method and studied by a series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments. The results showed that CeO2 particles grew along TiO2 faces and amorphous cerium in the lattice of TiO2, both of which are present on the CeO2/TiO2 catalyst. NH4+ might adsorb on the Ti–O–Ce structures or TiO2–CeO2 interface as Brønsted acid sites, while two types of NH4+ species were distinguished by the time-resolved spectroscopic method due to the different increasing trends. Based on the temporal evolution transient in situ DRIFTS spectra, L-NH3 had higher activity than coordinated NH3 species, which suggested that gas phase NO reacted preferentially with L-NH3. The NH4NO3 intermediate dominated the SCR reactions over the CeO2/TiO2 catalyst, which followed the Eley–Rideal mechanism.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）