ChemPhotoChem
·
2025
·
IF 3
Mengrong Zhang,Sha Ni,Zichao Yang,Min Zhang,Zhongjie Guan,Jianjun Yang
Graphical Cu-modified monoclinic TiO 2 nanoflowers with OVs (Cu 1 TB-1.5) promote the reactivity and selectivity of CO 2 reduction to CO under visible light. CO selectivity is 99.6%, and the cycling stability is excellent. The Cu 1 TB-1.5 facilitates the formation of the intermediate COOH* during the photocatalytic process, thus improving the yield and selectivity of CO. The photoreduction of CO 2 has attracted extensive attention as a promising solution to global warming. In this study, Cu-modified TiO 2 (B) (CuTB) nanoflowers with oxygen vacancies (OVs) are designed and synthesized via hydrothermal treatment and photodeposition to promote the reactivity and selectivity of CO 2 reduction to CO under visible light. The CO and CH 4 yields of sample Cu 1 TB-1.5 under visible light are 5.72 and 0.02 μmol g −1 h −1 , wherein the CO yield was 15.5 times that of sample TB; its selectivity is 99.6%, and the cycling stability is excellent. OVs can broaden the light absorption of TB to the visible light region, and Cu promotes photoinduced electron transfer from TB to the Cu species and act as an active center. The OVs and Cu can synergistically enhance charge separation, CO 2 adsorption, and CO 2 conversion. The Cu 1 TB-1.5 facilitates the formation of the intermediate COOH* during the photocatalytic process, thus improving the yield and selectivity of CO. This research provides a unique idea for the development of novel highly selective photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 40
·17516-17523
·
IF 7.76
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
Semiconductor-based photocatalytic hydrogen (H2) evolution from water is of great importance for solar-to-chemical conversion processes to boost and promote the future hydrogen economy. Here, for the first time, we demonstrate that p-Cu3P coupled with n-TiO2 forms a novel hybrid structure which accelerates electron–hole pair separation and transfer for improved photocatalytic H2-evolution activity. The rate of H2 evolution of the optimized Cu3P/TiO2 (7940 μmol h−1 g−1) is 11 times higher than that of bare TiO2, with an apparent quantum efficiency (AQE) of 4.6%. This work may provide more insight into the synthesis of novel phosphide-based hybrid materials with high photocatalytic H2-evolution activity and sufficient stability for solar-to-chemical conversion and utilization.
研究领域:
材料科学
·
能源化学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2016
·
IF 3.958
Zhiwei Li,Guodong Jiang,Zihao Zhang,Ye Wu,Yinhui Han
Photocatalysts Phosphorus-Doped g-C 3 N 4 (P(x%)-g-C 3 N 4 ) were successfully prepared by a two-step method using melamine and phosphonitrilic chloride trimer (Cl 6 N 3 P 3 ). Then, the Phosphorus-doped g-C 3 N 4 sheets coated with TiO 2 nanoparticles (P(x%)-g-C 3 N 4 /TiO 2 ) were prepared by solvent-thermal method. The as-prepared P(x%)-g-C 3 N 4 /TiO 2 composites showed enhanced light absorption and photocatalytic properties in visible light region. The morphology of g-C 3 N 4 nanosheets and square flake TiO 2 nanoparticles were analyzed with field emission scanning electron microscopy (FESEM) and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) proved that the P-C bonds were generated in P(x%)-g-C 3 N 4 . Photoluminescence (PL) spectra revealed that the phosphorus doping improved the separation and transfer of photogenerated electrons and holes in P(x%)-g-C 3 N 4 , UV–vis diffuse reflectance spectra (UV-vis DRS) indicated that the P(x%)-g-C 3 N 4 /TiO 2 heterostructure enhanced the absorption of visible light. The photocatalytic activity of the P(x%)-g-C 3 N 4 was evaluated by photocatalytic degradation of Methyl Blue (MB) under visible light irradiation. The result indicated that the P(0.1%)-g-C 3 N 4 /TiO 2 composite present considerably high photocatalytic degradation activities on MB, and the degradation of MB by P(0.1%)-g-C 3 N 4 /TiO 2 were 5.1 times and 2.9 times as high as that of g-C 3 N 4 and P25, respectively. At the end of article, a possible photocatalytic mechanism was discussed based on the experimental results.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Richao Niu,Rubing Han,Shaochun Tang,Junwu Zhu
Graphene and MXenes, both as an emerging two-dimensional (2D) material, have become the predominant choice of electrochemical energy electrode materials owing to large surface-area-to-volume ratio and high electrical conductivity . However, severe restacking of such 2D ultrathin nanostructures largely lowers active surfaces and thus constrains their applications. Herein, we develop a microwave selective heating strategy that is highly efficient for ultrafast and scalable fabrication of novel coral-like porous MXene/graphene composite with high-quality graphene and well-dispersed TiO 2 nanocrystals . The MXene not only works as a source material but also serves as an excellent microwave absorbent, which leads to that reduction of graphene oxides can be completed within only 10 s under microwave irradiation at a much lower applied power of 200 W than the reported value of 1000 W. Especially the coral-like TiO 2 -MXene/graphene material with large porosity delivers much higher capacity (356 mAh g −1 at 50 mA g −1 ) and much better rate capability than those for pure graphene, MXene and other MXene/graphene composites. That is attributed to the composites avoids restacking, assures structural stability, and provides high specific surface area and excellent electrons/ions conductivity. This work provides a new route to large-scale and low-cost production of high-performance electrode materials for lithium-ion battery.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wenlan Ji,Weiwei Li,Tian C. Zhang,Yuan Wang,Shaojun Yuan
Arsenic-containing water needs to be purified to reduce the global hazards of arsenic to human health and ecosystems. Herein, successive electrodeposition of SnO 2 and RuO 2 nanoparticles on the TiO 2 nanotube arrays (TNTAs) was performed to synthesize dimensionally stable TNTAs/SnO 2 /RuO 2 anodes for highly efficient electrocatalytic oxidation of As(III) in aqueous solution. Such a TNTAs/SnO 2 /RuO 2 anode possessed fast charge transfer, higher oxygen evolution potential (OEP), larger electrocatalytic active area, and excellent stability, and delivered effectively electrocatalytic oxidation As(III), of which 10 mg/L of As(III) was completely oxidized into As(Ⅴ) with lower toxicity within 20 min owing to the synergistic effect of RuO 2 and SnO 2 . Impressively, the optimized TNTAs/SnO 2 /RuO 2 -10 anode presented an excellent electrochemical stability and longer service lifetime, and its oxidation conversion efficiency of As(III) still could be maintained to be 98% as well as its kinetic reaction constant decreased by only 0.03 even after 11 recycled usage, which was ascribed to the intensified interaction between RuO 2 and TNTAs/SnO 2 . The excellence of the innovative anode was also evidenced through its strong anti-interference ability to coexisting ions and the elucidation of the associated oxidation reaction mechanism of As(III) on the surface of the anode by electron spin resonance and radical scavenger tests. This novel electrode integrates high electrocatalytic activity, high electron transport and high stability, ensures the long-term stable use of the electrode, while realizes efficient and rapid electrocatalytic oxidation of As(III) in aquatic environments. This work provides new ideas for further improving the catalytic performance and stability of dimensionally-stable anode materials.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2018
·Vol. 33
·期 16
·2414-2422
·
IF 1.495
Youchun Pan,Yuesong Shen,Qijie Jin,Shemin Zhu
A series of Ba-modified MnCeOx/TiO2 catalysts were prepared by a wet impregnation method and tested for selective catalytic reduction (SCR) of NO with NH3 at low temperature. The results showed that Ba additives obviously improved the catalytic performance of the MnCeOx/TiO2 catalyst for NH3-SCR, and the BaMnCeOx/TiO2 catalyst with 3 wt% BaO exhibited the optimal catalytic performance. Moreover, the introduction of Ba also improved the resistances toward water vapor and SO2 of catalysts. The N2 adsorption, H2-TPR, and X-ray photoelectron spectroscopy results showed that the addition of Ba increased the specific surface area, redox properties, and concentrations of surface Mn4+ and chemisorbed oxygen of catalysts. Furthermore, NH3-TPD and NO-TPD were used to investigate the absorption of NH3 and NO on the catalyst. The results revealed that although the introduction of Ba significantly promoted the adsorption of NO, it also inhibited the adsorption of NH3. Consequently, the catalytic performance of MnCeOx/TiO2 was greatly improved with the Ba additives.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2022
·
IF 6.535
Xing Yuan,Chaohe Zheng,Zuwei Xu,Qinghua Yang,Tiantian Zhang,Xi Luo,Haibo Zhao
Photothermocatalytic oxidation is an environmentally-friendly, low-temperature, and high-efficient method to remove the air pollutant. Yet, the lack of active, inexpensive, and superior stability catalysts has greatly limited its extensive utilization. In this work, the effect of single-atom Pt loading on TiO 2 support has been theoretically and experimentally studied to improve photothermocatalytic performance for the toluene combustion through flame spray pyrolysis (FSP). Pt loading can play two crucial roles into TiO 2 optimization: (1) The low-valence Pt cation incorporated into TiO 2 lattice is dramatically responsible for the anatase-rutile transformation (ART) and formation of sufficient oxygen vacancies ; (2) Introducing the defect energy level and Pt-3d orbitals remarkably promote the charge separation efficiency of single-atom catalysts. Moreover, the existence of single-atom Pt nanoparticles can signally boost the activity of surface adsorbed and lattice oxygen, as well as substantially reduce the oxygen vacancy formation energy. Thus, the toluene removal under light irradiation reaches 90% conversion below 160 °C and is maximally 18 °C lower than that under only thermocatalytic oxidation. It is attributed to larger specific surface area (SSA), outstanding low-temperature reducibility, extremely dispersed hybrid PtO x , more surface active oxygen, and higher mobility of bulk oxygen. Interestingly, when the oxygen-fuel equivalent ratio φ distinctly increases by shifting precursor solvent from xylene to ethanol, the photothermocatalytic property of toluene can be remarkably enhanced on single-atom Pt catalysts. It is due to the higher Pt dispersion resulting from more intense burning and drastic turbulent mixing, as well as the superior ratio of the metallic Pt active sites originating from higher flame temperature. Eventually, the rate-determining step of C 7 H 8 combustion on Pt/TiO 2 and Cu/TiO 2 slab are all the C C bond fracture of maleic anhydride to form acetic anhydride species, with the energy barriers of 112.03 and 188.74 kJ/mol, respectively.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanxu Wang,Lijia Huang,Tian C. Zhang,Yan Wang,Shaojun Yuan
Ammonia gas (NH 3 ) is a notorious malodorous pollutant with detrimental effects on environment and human health. Removing NH 3 through photocatalytic oxidation remains a challenging task due to unclear reaction mechanisms. In this study, DFT simulation results revealed that C doped TiO 2 could extend the photo-response range to the visible region, but the introduction of deep impurity levels was found to accelerate photogenerated carrier recombination. Fortunately, the rational doping of Mo was found to mitigate this negative effect. Accordingly, Mo, C co-doped TiO 2 was synthesized via a facile low-temperature calcination process, resulting in unique band structure that enhanced the photocatalytic oxidation of NH 3 . Notably, in-situ DRIFTS and DFT results demonstrated that the gradual reaction of NH 3 adsorbed on Mo atoms with oxygen species through the N 2 H 4 mechanism, promoting the formation of N 2 . These findings offer insights into the design of efficient photocatalysts for NH 3 removal under visible light, and present a promising technology for indoor air pollution control.
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
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Tian Zhang,Danping Jiang,Yameng Li,Huan Zhang,Zhiping Zhang,Francesco Petracchini,Valerio Paolini,Yang Zhang,Tian Yue,Quanguo Zhang
This study explored the interrelationship between nano-TiO 2 addition and photo-fermentative hydrogen production (PFHP) of corn straw. The maximum cumulative hydrogen volume (CHV) was up to 688.8 mL under the optimal photo-fermentative process conditions with nano-TiO 2 addition of 300 mg/L. Initial pH and interaction between substrate concentration and light intensity had highly significant effects on PFHP of corn straw with nano-TiO 2 addition. With the improvement of CHV, nano-TiO 2 addition decreased the optimal initial pH and substrate concentration for PFHP of corn straw. Moreover, nano-TiO 2 addition promoted the metabolism of butyric acid and acetic acid by photosynthetic bacteria HAU-M1, and significantly reduced the total concentration of intermediate byproducts during hydrogen production to a low level of 1.6–2.5 g/L, thus making the CHV, maximum hydrogen production rate (HPR) and average hydrogen content (HC) increased by 32.6%, 27.9% and 8.3% respectively over the control without nano-TiO 2 addition.
研究领域:
环境生物学
·
能源微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Ruirui Hao,Guohong Wang,Hua Tang,Lingling Sun,Chang Xu,Deyan Han
Mesoporous photocatalytic materials with macroporous structures have attracted more and more attention because of their textural mesopores and intrinsic interconnected pore networks, which are able to efficiently transport guest species to framework binding sites. In this work, macro/mesoporous g-C 3 N 4 /TiO 2 heterojunction photocatalysts were fabricated without templates or additives by a facile calcination method using tetrabutyl titanate and melamine as the feedstocks. Photocatalytic experiments of the as-prepared samples were measured by the photocatalytic oxidation degradation of RhB solution at room temperature under visible light irradiation. The results indicated that the melamine content in the precursors had an important influence on photocatalytic activity of the as-prepared samples. At the optimal loading content, the apparent reaction rate constant ( k ) was 47.8 × 10 −3 min −1 for RhB degradation, exceeding that of pure TiO 2 (6.6 × 10 −3 min −1 ) and g-C 3 N 4 (15.2 × 10 −3 min −1 ) by factor of 7.2 and 3.1 respectively. The improved photocatalytic activity was attributed to high surface area and heterostructure formation of g-C 3 N 4 /TiO 2 composites. The trapping experiment results showed that O 2 − and h + were main active species in the decomposition of RhB. A possible enhanced photocatalytic mechanism of g-C 3 N 4 /TiO 2 heterojunction photocatalysts was proposed.
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
RSC Advances
·
2017
·Vol. 7
·期 25
·14959-14965
·
IF 3.108
Xinxin Yu,Ranran Cai,Yuqing Song,Qiang Gao,Nan Pan,Mingzai Wu,Xiaoping Wang
During the past decades, researchers have made great efforts towards an ideal surface enhanced Raman spectroscopy (SERS) substrate. Here a smart SERS-active flexible substrate was designed and its performance was studied. The substrate is constructed from graphene and TiO2, and could be divided into two functional layers. Graphene provides a flat hot surface for Raman enhancement, which could be ascribed to chemical enhancement. The TiO2 layer is an effective photocatalyst, which could induce photocatalytic decomposition of adsorbed molecules under UV irradiation. Notably, the substrate was realized by a one-step transfer method, followed by annealing. In the synthesis process, a flexible TiO2 layer was produced by spin-coating on the CVD graphene and was used as a support in the transfer process of graphene instead of PMMA, which could exclude contamination and avoid degradation of the Raman enhancement performance. Combining detection with degradation of trace amounts of analyte, the versatility of the SERS substrate is greatly enhanced and could be adapted to fit a wide range of sensing and photocatalytic applications.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37089-37102
·
IF 3.361
Qianqian Shang,Yuzhen Fang,Xingliang Yin,Xiangjin Kong
Structure design of photocatalysts is highly desirable for taking full advantage of their abilities for H2 evolution. Herein, the highly-efficient TiO2{001}/g-C3N4 (TCN) heterostructures have been fabricated successfully via an in situ ethanol-thermal method. And the structure of g-C3N4 in the TCN heterostructures could be exfoliated from bulk g-C3N4 to nanosheets, nanocrystals and quantum dots with the increase of the synthetic temperature. Through detailed characterization, the structural evolution of g-C3N4 could be attributed to the enhanced temperature of the ethanol-thermal treatment with the shear effects of HF acid. As expected, the optimal TCN-2 heterostructure shows excellent photocatalytic H2 evolution efficiency (1.78 mmol h−1 g−1) under visible-light irradiation. Except for the formed built-in electric field, the significantly enhanced photocatalytic activity of TCN-2 could be ascribed to the enhanced crystallinity of TiO2{001} nanosheets and the formed g-C3N4 nanocrystals with large surface area, which could extend the visible light absorption, and expedite the transfer of photo-generated charge carriers further. Our work could provide guidance on designing TCN heterostructures with the desired structure for highly-efficient photocatalytic water splitting.
研究领域:
材料科学
·
能源化学
✓ 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）