JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Yanping Dong,Xiqiang Tian,Hongji Zhao
Highly efficient synthesis of valuable furfuryl alcohol by furfural hydrogenation is still a challenge for Pt-based catalysts under mild conditions. Herein, we report the synthesis of N-doped TiO 2 nanosheets (N–TiO 2 –ST) by a simple one-step hydrothermal method. Subsequently, platinum catalysts were loaded onto N-doped TiO 2 nanosheets using a simple impregnation method followed by reduction with sodium borohydride (NaBH 4 ). The resulting catalysts exhibited excellent catalytic performance in the hydrogenation of furfural. Especially, the turnover frequency (TOF) of Pt/N–TiO 2 –ST reached 694 h -1 , much higher than that of Pt/TiO 2 -ST (565 h -1 ). Furthermore, the structure and surface properties of as-prepared samples was characterized with the combination of XRD, Raman, N 2 adsorption-desorption, SEM, TEM, XPS, CO chemisorption and CO-FTIR. The excellent catalytic performance of Pt/N–TiO 2 –ST can be ascribed to higher surface area and surface defects (oxygen vacancies) on the N-TiO 2 nanosheets, which improves the diffusion of Pt species on the support surface and forms ultrafine Pt particles to expose more active sites (Pt 0 species) for selective adsorption and activation of C O groups of furfural. The results show that Pt/N–TiO 2 –ST is a viable and promising catalyst for furfural hydrogenation.
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Tongxin Xiao,Xige Wu,Hongbao Liang,Kangyue Qiao,Ying Chen
Solar-powered photocatalytic conversion of CO2 into green solar fuels is one of the effective ways to solve the global energy crisis and the greenhouse effect. A new artificial photosynthesis system composed of TiO2 nanotube arrays (TiO2NTs) and bimetallic porphyrin was fabricated, and their photocatalytic activities were evaluated by the reduction of gas-phase CO2 to CH4 under simulated solar irradiation. Compared to pure TiO2NTs and CoTCPP/TiO2NTs, bimetallic porphyrin-sensitized TiO2NTs displayed greatly ameliorated photocatalytic activity. Among them, Ni-CoTCPP/TiO2NTs exhibited the highest photoreduction efficiency, and the reduction rate of CO2 into CH4 was up to 52.27 μmol/cm2/h with the quantum efficiency of 1.002%, about 7 times higher than that of pure TiO2NTs. The increase in photocatalytic performance can be attributed to the enhancement of the light absorption capacity of Ni-CoTCPP/TiO2NTs and the higher charge separation efficiency. Furthermore, according to the results of the photocatalytic evaluation and photo(electro)chemical studies, a possible mechanism of CO2 photoreduction over Ni-CoTCPP/TiO2NTs was proposed.
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ChemCatChem
·
2024
·
IF 3.8
Chengzhuo Yu,Jin Xu,Yarui Wang,Silong Wang,Li Xiong,Fanglan Geng,Zesen Shang,Huasheng Wu,Jitao Lv,Lixia Zhao,Yawei Wang
Graphical Untill now, reactive oxygen species (ROS) are difficult to generate in the natural light conditions, since most photocatalysts require external strong stimuli. We surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. The ROS generation patterns and mechanism of MIL-100(Fe)/TiO 2 was revealed by chemiluminescence (CL) and density functional theory (DFT). Reactive oxygen species (ROS), as one kind of the most highly oxidizing oxidants, are difficult to generate and utilize in the natural light conditions, since many materials require external strong stimuli for ROS release to be effective as pollutant degradation or biocide. In this work, we surprisingly found the ROS generation on MIL-100(Fe)/TiO 2 driven by mild natural light. Then ROS generation patterns and mechanism was revealed by chemiluminescence (CL) and density functional theory (DFT). Meanwhile, rhodamine B (RhB) can also be removed by MIL-100(Fe)/TiO 2 under natural light, which further evidence the ROS generation under the natural light. This work provides a new direction for spontaneously generating ROS releasing without external strong stimuli and has the broad potential applications in the field of pollutant degradation or antimicrobials under natural conditions.
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RSC Advances
·
2024
·Vol. 14
·期 12
·8100-8107
·
IF 3.9
Yu Hua,Xiaomeng Zhang,Fulin Chen,Yuantao Sun,Xinyu Wang,Ziliang Wen,Qinghao Tan,Chenxi Sun,Buhe Bateer
In this study, we utilized a simple calcination method to prepare a Ni/TiO2/C composite, which was synchronously grown from magnetic, semiconductor, and conductive materials. XRD, SEM, Raman, and XPS characterization methods were used to analyze the crystal structure, graphitization degree, morphology size, and valence state of Ni/TiO2/C, and its electromagnetic wave absorption performance was tested. It was revealed that rod-like Ni/TiO2/C had good electromagnetic wave absorption performance at a thickness of 1–5.5 mm; in particular, its reflectance reached −40 dB at 3.5 mm and its absorption bandwidth (reflectivity < −10 dB) reached 4.4 GHz (6.0–10.4 GHz) at a thickness of 4.0 mm. It was thus revealed that its electromagnetic wave absorption rate and absorption bandwidth can be regulated by its thickness. Compared with Ni/TiO2, it was proven that the conductive materials (carbon), magnetic materials (Ni), and semiconductor materials (TiO2) in the rod-like Ni/TiO2/C composite can synergistically absorb electromagnetic wave energy through dielectric and magnetic losses.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Lifang Chen,Haiyang Zheng,Aimin Li,Xin Qiu,Lian Wang
The photocatalytic reduction of nitrate has received considerable attention due to its high efficiency and environmentally friendly nature. The excessive addition of hole scavengers is the most commonly used method to increase the nitrate reduction efficiency. However, achieving high selectivity in the photocatalytic reduction of nitrate to N 2 with low concentration of hole scavengers remains challenging. In this study, the SrFe x Ti 1−x O 3 /TiO 2 S-scheme heterojunction photocatalysts with many Lewis acidic adsorption sites have been developed. The experimental results demonstrated that the incorporation of 6% Fe into SrFe 0.06 Ti 0.94 O 3 /TiO 2 (SFTO6) resulted in the nitrate conversion rate of 97.68% and the N 2 selectivity reached 96.35% with 25 mmol/L formic acid . Moreover, it also exhibited excellent stability and recycle ability. After 5 cycles, SFTO6 still exhibited a stable photocatalytic denitration efficiency of 92.94%, highlighting its potential for practical application. Through comprehensive mechanistic investigations, enhancing direct reduction process is considered the key to its high reduction efficiency with low formic acid . And the Lewis acidic adsorption sites enhance N 2 selectivity by enriching NO x − on the surface of the material. Overall, this study provides a novel approach for achieving efficient photocatalytic reduction of nitrate to N 2 under conditions with low concentration of hole scavengers.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yin Peng,Jianyu Wang,Liying Wang,Xijia Yang,Yang Gao,Xuesong Li,Wei Lü
Transparent TiO2 photoanodes offer promise for new solar technology due to their high light transmittance, but the persistently inadequate solar conversion efficiency continues to pose obstacles for practical application. This research utilized n-butyl titanate and black P25 TiO2 (B-P25) to construct transparent TiO2 photoanodes for quantum dot sensitized solar cells (QDSSCs). The B-P25 presents rich oxygen vacancies after reduction, along with the generation of more pore structures in the TiO2 photoanode films, facilitating the transport of photogenerated charge carriers in the photoanode films. Therefore, the photoelectric conversion efficiency (PCE) is significantly enhanced from 1.77% to 5.04%, with an increase in the short-circuit current density in the J–V curve from 8.10 to 17.67 mA cm−2. This study demonstrates that B-P25 prepared using the reduction method can effectively fabricate photoanodes with high photovoltaic performance, which improves the optical properties and solar cell efficiency of QDSSCs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenjing Zhang,Ming Xu,Ting Wang,Yuqi Wang,Bowen Li,Mei Liu,Ming Feng
Developing effective and robust catalysts with high gas adsorption capacities and electron-hole separation rates for direct photochemical N 2 reduction reaction is extremely crucial but remains quite challenging. Here, a novel dual Z-scheme heterostructured polyoxometalate/activated carbon/TiO 2 (Co 4 PW 9 -C-TiO 2 ) ternary composite was constructed through a well-designed two-step hydrothermal method and first applied for efficient and stable N 2 fixation under mild conditions without any precious-metal cocatalysts and organic scavengers. The rational heterostructure brings a remarkable NH 3 production rate of 399.9 µmol·h −1 ·g cat -1 ·L -1 , which significantly exceeds the corresponding binary composites, and about 9-fold and 6-fold improvement over that of discrete TiO 2 and Co 4 PW 9 , respectively. Further comprehensive characterization and analysis revealed a reasonable dual Z-scheme charge transfer mechanism and demonstrated that such superior photocatalytic performance can be ascribed to the unique structure of the ternary composite, including the improved solar energy utilization efficiency, enhanced N 2 absorption ability, facilitated photoexcited charge carrier transport/separation rate and elevated redox ability. This work provides a reasonable construction strategy to further develop excellent catalysts for photocatalytic ammonia synthesis.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhaohui Wang,Kun Li,Junling Hu,Ang Li,Yang Tang,Yanzhi Sun,Pingyu Wan,Haomin Jiang,Yongmei Chen
H 2 O 2 production in coupled electrochemical systems, where H 2 O 2 is generated through 2e-pathway of water oxidation (2e-WOR) at anode and 2e-pathway of oxygen reduction (2e-ORR) at cathode, offers an advanced alternative to the anthraquinone process. However, the efficiency of such coupled system is often hindered by the limited activity and selectivity of electrocatalysts. Herein, a dual-functional catalyst composed of amorphous TiO 2 embedded in mesoporous carbon hollow spheres (TiO x @MCHS) is reported, which exhibits exceptional electrocatalytic performance for both 2e-WOR and 2e-ORR. By employing TiO x @MCHS-loaded electrodes as both anode and cathode in a membrane-free flow cell with 4 м K 2 CO 3 /KHCO 3 as electrolyte, a rate of 108.3 µmol min −1 cm −2 and a Faradaic efficiency (FE) of ≈145% for H 2 O 2 production are achieved at a voltage of ≈2.5 V under a constant current of 240 mA (anode: 1 cm 2 , cathode: 4 cm 2 ). Experimental and computational results reveal the crucial role of low-coordinated Ti in optimizing the adsorption of intermediates involved in the two electrode reaction pathways, thereby enhancing both activity and selectivity of these processes. This work establishes a new paradigm for the development of advanced electrocatalysts and the design of novel coupled-electrolysis systems, enabling scalable and sustainable H 2 O 2 electrosynthesis.
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CRYSTENGCOMM
·
2024
·Vol. 26
·期 39
·5574-5584
·
IF 2.6
Manshu Han,Yirong Zhao,Yongfeng Bai,Yu Li,Minghua Chen,Qingguo Chen
Bi-based materials can retain massive amounts of sodium ions through alloying and conversion reactions, resulting in excellent theoretical capacity. However, during the sodiation/desodiation process, there is always a significant volume change in the alloying reaction. In this work, TiO2-coated hexagonal-phase topological insulator (TI) Bi2Te3 composites grown on carbon cloth (CC) were prepared using a solvothermal reaction and an atomic layer deposition process (TiO2/Bi2Te3/CC) as anode materials for sodium-ion batteries without the need for a binder. Compared to the pure Bi2Te3 electrode, the optimized TiO2/Bi2Te3/CC composite exhibits a superior specific capacity of 450 mA h g−1, a high rate performance of 0.1 A g−1, and a high cycling stability of 100 cycles due to the inherent properties of TIs, contributed by the effective TiO2 cladding layer and large interfacial spacing of Bi2Te3. The enhanced reversible capacitance, rate capability, and cycling performances can be attributed to the heterointerfaces and excellent mechanical properties of TiO2, which balance the electronic structure of the building blocks and inhibit the detaching of Bi2Te3 due to large internal stresses. The amorphous TiO2/Bi2Te3/CC composite was treated in a tubular furnace to obtain crystalline TiO2/Bi2Te3/CC, and the electrochemical performance of the heterostructures formed by the TiO2 coating layer with different properties was compared. This work demonstrates the enormous potential for enhancing the sodium-ion storage capabilities of alloy electrode materials by constructing heterostructures.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 15
·155402
·
IF 2.9
Wei Zhang,Xing Zhang,Lina Zhang,Jinwen Ma,Xiaotong Yin,Yuxin Tian,Chuang Wang,Qiushi Wang
A novel 3D hierarchical TiO2/CaIn2S4/C3N4 arrays with dual heterojunctions photoanode is constructed by stepwise deposition of CaIn2S4 nanosheets and ultrathin C3N4 onto the well-aligned TiO2 nanorods arrays. Integrating the merit of the superior ability of CaIn2S4 and C3N4 to harvest visible light, dual type-Ⅱ heterojunction band structure and one-dimensional ordered nanostructures, the TiO2/CaIn2S4/C3N4 photoanode exhibits simultaneous significant improvements in visible-light harvesting, charge separation and electron transfer capability. At 1.23 V (versus reversible hydrogen electrode) under AM 1.5 G irradiation, the TiO2/CaIn2S475/C3N4 photoanode exhibits a photocurrent density of 4.5 mA cm−2, which is 5.2 and 51.1-fold higher than that of TiO2/CaIn2S475 and pristine TiO2 photoanode, respectively. Moreover, the applied bias photo-to-current efficiency (ABPE) of the TiO2/CaIn2S475/C3N4 photoanode reaches 3.5% at 0.36 V (versus reversible hydrogen electrode). These results are helpful for fabricating more efficient heterostructure photoelectrodes.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Lifen Su,Haoming Xie,Xiaoyu Liu,Bin Yang,Jibin Miao,Ru Xia,Jiasheng Qian,Lei Miao
Although the solar interfacial evaporation technology with the advantages of outstanding photothermal conversion, easy availability and high freshwater production, their photothermal materials still face the problem of contaminated by the organic pollutants in the raw waters such as sewage and natural water. Herein, we present a vertically oriented hierarchical C/TiO 2 nanotubes with bifunction of photocatalytic degradation of pollutants and freshwater production via photothermal effect synchronously. The carbon nanoparticles of the hierarchical C/TiO 2 nanotubes not only broaden the range of sunlight absorption to accelerate the water evaporation, but also reduced the recombination of electron-hole significantly to improve the photocatalytic efficiency. Meanwhile, the excellent water transportation via unique arranged arrays vertically, the abundant active sites derived from hierarchical structure, the vertical oriented C/TiO 2 nanotubes exhibit a large solar-driven water evaporation rate of 1.59 kg m −2 h −1 and the methyl orange (MO) photodegradation efficiency of 92.9 % for the underneath sewage under 1 sun illumination synchronously. These findings have great potential applications in solar-powered production freshwater from wastewater and natural waters such as rain and river water.
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Water
·
2025
·Vol. 17
·期 2
·161
·
IF 3
Nan Xiong,Yansen Guo,Yanyan Nie,Yuqing Yao,Zhemian Ying,Wei Zhang,Renduo Liu,Xiaoling Wu,He Zhou,Limin Zhou,Ying Wang,Jian He,Long Yan
As a well-known photocatalyst, TiO2still suffers from rapid electron–hole recombination and limited visible light absorption. To overcome these challenges, the combination of graphene and TiO2has been proposed. However, traditional methods such as ball milling and hydrothermal synthesis face limitations, including high energy consumption and complex procedures. Here, we develop a simple and industrially feasible method to prepare reduced graphene oxide (rGO)-coated TiO2nanoparticles, referred to as rGO-TiO2composites. The optimized rGO-TiO2composites exhibit an enhanced photocatalytic degradation of rhodamine B (RhB) under simulated sunlight conditions, about 99.95% for 4% rGO-TiO2within 80 min. The first-order reaction rate constant (k) of 4% rGO-TiO2(0.0867 min−1) is 5.42 times higher than that of nano TiO2(0.0135 min−1). The key reactive species involved in the degradation process are identified. Additionally, the effects of pH and NaCl concentration on the degradation efficiency of rGO-TiO2are also investigated. The 4% rGO-TiO2composite exhibits an excellent photocatalytic activity within the pH range of 3.87–11.89, and the NaCl concentration does not affect its photocatalytic efficiency. After characterization, the enhanced photocatalytic activity is ascribed to the introduction of rGO and the generation of surface oxygen vacancies (OV) and Ti3+in TiO2crystals.
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