ChemNanoMat
·
2024
·Vol. 10
·期 7
·e202400053
·
IF 2.6
Yuqian Fei,Zizhuo Nie,Shujiang Ding,Jiuhong Wang,Wei Yu,Na Li,Yuhang Liu,Bo Peng,Xiaoli Feng,Limin Liu,Xinbing Jiang
Gas sensors for ammonia (NH 3 ) play a crucial role in the maintenance of air quality, preservation of the atmosphere, and evaluation of human health. However, the endeavor to attain a high level of sensitivity in detecting NH 3 under ambient conditions remains a challenging task. In this work, poly(3-hexylthiophene)s and titanium dioxide (P3HT-TiO 2 ) heterostructure NH 3 gas-sensitive material was prepared, and by drop-casting the material onto a substrate with Au interdigital electrodes, a sensor for high-response detection of NH 3 at room temperature was constructed. The designed gas sensor exhibited a high response signal of 114.61 % toward 15 ppm NH 3 at room temperature (25 °C) with good reproducibility, strong long-term stability, and excellent selectivity. Moreover, by analyzing the response law of the sensor under different humidity conditions, it has been noted that both excessively high and excessively low levels of humidity adversely affect the sensor's response. The remarkable increase in NH 3 sensing properties is attributed to the synergistic enhancement effect of P−N heterojunction formed between P3HT and TiO 2 . This NH 3 gas sensor exhibits tremendous potential for use due to its straightforward structure and outstanding ammonia sensing performance.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
·
IF 4.7
Li-guo ZHU,Chong-lin BAI,Ling-xin KONG,Bin YANG,Bao-qiang XU
To reduce the production cost of titanium, a new method for direct preparation of low-oxygen titanium powder by the magnesiothermic reduction of TiO 2 with the assistance of a MgCl 2 -HoCl 3 molten salt was proposed. Thermodynamic calculations showed that the magnesiothermic reduction of TiO 2 was feasible. However, hindrance of the reduction reaction by the reduction by-product of MgO resulted in a considerably high O concentration in the titanium powder. The addition of HoCl 3 to the system significantly reduces the activity of MgO to produce low-oxygen titanium powder. Thermochemical deoxidation and reduction experiments were conducted with MgCl 2 -HoCl 3 molten salt in the temperature range of 1023-1273 K. The results showed that titanium powder with oxygen concentration (mass fraction) below 5.00×10 -4 can be prepared at the Mg-MgCl 2 -HoOCl-HoCl 3 equilibrium.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Yu Shao,Zhisheng Mao,Jiarui Wang,Xianfeng Hao,Yongchao Jia,Yuanhui Xu,Keju Sun
The electrochemical synthesis of hydrogen peroxide through two-electron oxygen reduction (2e– ORR) presents a sustainable alternative to conventional synthesis methods, such as the anthraquinone method. TiO2-based materials are promising candidates due to their stability and tunable electronic properties, but their intrinsic 2e– ORR activity and selectivity are insufficient for practical applications. Here, we report that strategic Fe doping significantly enhances the 2e– ORR performance of TiO2. The optimized Fe-TiO2 catalyst exhibits remarkable activity and selectivity, achieving a 30% increase in H2O2 selectivity (from 47% to 77%) while reducing the electron transfer number from 3.05 to 2.45 in 0.1 M KOH electrolyte. Notably, the material shows substantially improved electrochemical active surface area (ECSA) and ORR kinetics, culminating in an exceptional H2O2 production rate of 406 mmol·gcat–1·h–1 with 97.5% Faraday efficiency at 0 V vs RHE in an H-cell configuration. Density functional theory (DFT) calculations reveal the mechanistic origins of this enhancement: Fe doping effectively narrows the band gap and lowers the oxygen vacancy formation energy, thereby boosting electrical conductivity as confirmed by experimental characterization; and the modified electronic structure increases Bader charge accumulation on the terminal oxygen of adsorbed *OOH intermediates, facilitating protonation at this site and consequently promoting the 2e– pathway. These dual effects synergistically enhance both ORR activity and H2O2 selectivity. This study not only presents Fe-TiO2 as an efficient, earth-abundant catalyst for sustainable H2O2 production but also establishes fundamental design principles for developing advanced metal oxide electrocatalysts through targeted heteroatom doping.
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ChemCatChem
·
2025
·
IF 3.9
Xiaoqi Tian,Dongxu Chen,Houde She,Jingwei Huang,Lei Wang,Qizhao Wang
Volatile organic compounds (VOCs) pose significant environmental and health risks, necessitating effective remediation strategies. This study addresses these challenges by synthesizing ZnSn(OH) 6 /TiO 2 heterojunction composites using a coprecipitation-hydrothermal coupling technique. Experiments showed that the synergistic effect of ZnSn(OH) 6 and TiO 2 significantly reduced the band gap (3.10 eV) of the composites and enhanced the visible light absorption ability, whereas the photogenerated electron–hole pair complexation was effectively suppressed through the interfacial charge transfer mechanism. Under simulated sunlight, 15% ZnSn(OH) 6 /TiO 2 degraded toluene at an initial concentration of 2,500 ppm by up to 90.51% in 90 min, with a mineralization rate of more than 84.51%, which is about three times higher than the performance of pure ZnSn(OH) 6 . Cycling experiments showed that the degradation rate remained at 90.32% after five times of reuse, demonstrating excellent stability. A combination of density functional theory (DFT) calculations and radical trapping experiments revealed that ·OH and ·O 2 − were the main active species in the composites, and the hydroxyl structure of ZnSn(OH) 6 promoted the adsorption and activation of toluene. This work presents a novel interfacial engineering and crystallographic regulation strategy for deep mineralization of VOCs, providing insights for designing cost-effective, durable environmental photocatalysts. Graphical This study describes the synthesis, structural, and surface characterization of TiO 2 nanoparticle-decorated layered ZnSn(OH) 6 composite catalysts, systematically evaluates their photocatalytic activity, degradation kinetics, and long-term stability for gaseous toluene under simulated solar light, and investigates photogenerated electron-hole migration pathways, separation efficiency, and reactive oxygen species formation mechanisms.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Dejian Zhao,Zhihong Wang,Shuaishuai Lyu,Yunhao Liu,Shaohui Xiong,Yingtian Zhang,Yu Pan,Qingpeng Cheng,Xingang Li
Non-classical Fischer–Tropsch to olefins (FTO) is a crucial yet highly complex industrial reaction that enables the direct conversion of syngas, derived from renewable feedstocks such as biomass, municipal solid waste, or captured CO 2 , into long-chain olefins (C 5+ = ) via a carbide mechanism. Here, we systemically investigate mechanisms and performance of Na-modified Ru/TiO 2 catalysts in non-classical FTO, and experimentally discover a new CO insertion pathway. Our findings show that Na modification alters the adsorption and activation behaviors of CO, H 2 and intermediates, eventually manipulating reaction mechanisms. The Ru/TiO 2 catalyst with less Na exhibits high CO dissociation and C-C coupling abilities but a poor dehydrogenation ability, which mainly obeys the carbide mechanism, benefiting to produce C 5+ alkanes, rather than olefins. However, excessive addition of Na would primarily make the Ru/TiO 2 catalyst alternately follow the CO insertion mechanism, preferring to produce short olefines (C 2-4 = ) because of the poor C-C coupling ability. After rational coordination of the two pathways through regulating the Na loadings, the 0.5NaRu/TiO 2 catalyst robustly exhibits ultra-high C 5+ = selectivity (80.9%) and impressive C 5+ = space time yield (1.68 × 10 -2 mol CO g cat -1 h -1 ) at 260 °C, without deactivation for over 100 h. These findings not only provide fundamental insights into the underlying mechanisms for long-chain olefin synthesis, but also offer theoretical guidance for developing advanced catalysts for industrial applications.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Shaoming Yang,Yaqi Wang,Jiayi Chen,Yun Feng,Jiahui Li,Yongxin Liu,Liangpeng Zeng,Ji Zhao,Jiali Zhang
Owing to its environmental compatibility and energy conservation properties, photocathodic protection (PCP) has emerged as a promising approach for metal corrosion protection. The key to efficient PCP lies in developing semiconductor composite materials that combine excellent photoelectrochemical performance with a simple preparation process. Herein, a carbon-doped TiO 2 /Bi 2 S 3 composite (Bi 2 S 3 /C-TiO 2 ) was fabricated via a single-step, low-temperature hydrolysis strategy using NH 2 -MIL-125(Ti) as the precursor, concurrently achieving carbon doping and incorporating a narrow-bandgap semiconductor. Characterization by UV-Vis diffuse reflectance spectroscopy and photoelectrochemical testing under illumination revealed that the composite exhibits significantly enhanced visible-light absorption while effectively suppressing photogenerated charge carrier recombination. Under optimized conditions, the Bi 2 S 3 /C-TiO 2 photoanode shifted the potential of coupled 304 stainless steel (304SS) to −464 mV (vs. Ag/AgCl) under visible-light irradiation—substantially below its corrosion potential—demonstrating effective photogenerated cathodic protection for 304SS.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Chi Zhang,Junwen Zhang,Lina Che,Xusheng Wang,Li Shi
Photothermal technology offers distinct advantages for catalytic CO 2 methanation. Herein, we synthesized a series of Ni-based catalysts (denoted as TiO 2-x /Ni-X) through controlled calcination of NiTi-layered double hydroxides (LDHs) precursors at 400–700°C. In a continuous-flow system under xenon lamp irradiation (3.2 W/cm²), the TiO 2-x /Ni-X catalysts exhibited a reduction temperature dependent CH 4 production rate. During 40-hour stability testing, the optimized TiO 2-x /Ni-550 catalyst achieved a sustained CH 4 production rate of 180 mmol g cat −1 h −1 with a remarkable near-unity selectivity (>99 %), and the light irradiation substantially enhanced the CH 4 yield compared to bare thermal catalysis. Comprehensive structural characterization and mechanistic studies revealed competing roles governing catalytic activity, with TiO 2-x /Ni-550 demonstrating an optimal balance for CH 4 generation kinetics.
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 1
·1-15
·
IF 3.8
Wang Tingting,Zhang Lucheng,Zhang Mingqing,Yang Fang,Wu Shilong
The widespread use of cyanidation in gold beneficiation leads to a large amount of SCN − in the gold extract tail solution, which poses a threat to the environment and human health. The present study successfully synthesized octadecyltrimethylammonium bromide/bentonite/titanium dioxide (OTAB/Bt/TiO 2 ) photocatalysts through a sol–gel hydrothermal approach. Evaluation of the BET specific surface area, X-ray diffraction (XRD) analysis, UV–vis diffuse reflectance spectroscopy, and zeta potential experiments unveiled the beneficial impact of incorporating OTAB. This inclusion led to an enlargement of the pore size and layer spacing of Bt, broadening the range of photoresponses. Additionally, it effectively neutralized the negative charge residing on the surface of Bt. Consequently, these enhancements contributed to the improved performance of the photocatalytic material in terms of adsorption and catalytic degradation of SCN − . The degradation rate of SCN − reached 98.78% under the reaction conditions of initial SCN − concentration of 50 mg/L, OTAB/Bt/TiO 2 dosage of 0.8 g/L, pH = 8, and reaction time of 300 min. The degradation of the SCN − composite through the OTAB/Bt/TiO 2 photocatalytic process followed a zero-order kinetic model with a calculated rate constant ( k value) of 0.1148 min −1 . Notably, this rate constant was 1.9 times greater than the degradation rate observed in the pure TiO 2 system. The free radical quenching test showed that h + , ∙OH and ∙O 2− were the main oxidizing substances for photocatalytic degradation. The identification of intermediates proved that the complete mineralization of SCN − could be achieved by OTAB/Bt/TiO 2 adsorption and photocatalytic degradation without generating the highly toxic intermediate CN − . Overall, this study provides guidance for the development of more photocatalysts with strong adsorption properties and more effective removal of SCN − from gold extraction tailings.
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Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 16
·8659-8666
·
IF 7.443
Yongji Xin,Linen Wu,Lei Ge,Changcun Han,Yujing Li,Siman Fang
In this work, a novel AuPd bimetallic nanoalloy decorated ultrathin 2D titanium dioxide (TiO2) nanosheet with high H2 evolution activity was prepared via a facile in situ synthesis method. The physical and photophysical properties of the as-prepared AuPd/TiO2 nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible diffuse reflection spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR) and surface photocurrent spectroscopy (SPC). The photocatalytic H2 evolution experiments indicate that the AuPd co-catalysts can efficiently promote the separation of photogenerated charge carriers in TiO2, and consequently enhance the H2 evolution activity. The 0.3 wt% AuPd/TiO2 sample shows the highest catalytic activity, and the corresponding H2 evolution rate is 526 μmol h−1 g−1, which is 31 times higher than that of pure TiO2 under simulated sunlight (λ > 300 nm) irradiation. A possible mechanism of the enhanced simulated sunlight catalytic performance of AuPd bimetallic nanoparticle (NP) decorated TiO2 nanosheets is proposed to guide further improvement of desirable functional materials. It is expected that the AuPd decorated TiO2 nanosheets obtained via a simple synthesis approach can be used as efficient photocatalysts and exhibit promising potential for new energy applications.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 10
·e6342
·
IF 4.105
Yue Dai,Tangtong Ju,Hailong Tang,Meiling Wang,Min Wang,Yongqing Ma,Ganhong Zheng
A novel composite of N-doped TiO 2 -quantum dots tightly anchored on graphene (denoted as N-doped TiO 2 -QDs@GP) with superior interfacial contact via C–Ti bond was synthesized via the simple one-pot vapor-thermal method. The as-obtained N-doped TiO 2 -QDs@GP includes TiO 2 QDs with an average size of 3.28 nm uniformly distributed on the surface of GP. The large specific area and superior interfacial contact via C–Ti bond ensured its potential photocatalytic application. Except for the effective interfacial charge transfer achieved via C–Ti chemical bond between TiO 2 QDs and GP, its enhanced visible light absorption and larger oxygen vacancy ratio also make contributions. Electron spin resonance spectra (ESR) were used to study the photocatalytic mechanism, which proved the participation of both superoxide radical (·O 2 − ) and hydroxyl radical (·OH) in the photocatalytic reactions. This work provides a promising one-pot method for constructing intimately contacted N-doped TiO 2 /GP composite with superior interfacial contact via C–Ti bond and excellent photocatalytic activities.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yunfeng Wang,Yingang Gui,Shasha He,Jiacheng Yang
The application of conventional sensors is limited due to energy supply issues and environmental problems, and current triboelectric nanogenerator (TENG) based self-powered sensing systems is hard to meet the specific requirement. In this paper, TiO 2 /Ni/C composites were prepared using MOF-derived Ni/C materials for SO 2 F 2 detection at room temperature. The excellent pore structure and high electrical conductivity of Ni/C material greatly improve the sensitivity properties of TiO 2 . The TiO 2 /Ni/C composites-based SO 2 F 2 sensor exhibits a wide detection range of 5–200 ppm concentration and a fast response/recovery time of 26 s/9 s, while its response value for 200 ppm SO 2 F 2 is 18.34 times higher than that of the pure TiO 2 -based sensor. Furthermore, by modifying the PVDF film with TiO 2 , the permittivity of PVDF is greatly improved, and the surface potential is 2.6 times higher than that of pure PVDF film. Eventually, a dual-layer hybrid TENG based on TiO 2 /PVDF composite film was constructed. Its upper TENG powers the TiO 2 /Ni/C composite sensor, and the lower hybrid TENG drives the thermohygrometer to realize a self-powered temperature and humidity-corrected SO 2 F 2 sensing system, which can accurately implement SO 2 F 2 gas concentration alarms at 10 ppm, 50 ppm, and 100 ppm at different humidity levels. This work broadens the application of TENG in the field of self-powered gas sensing while providing a new idea to achieve the trace detection of SO 2 F 2 at room temperature.
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MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Yuping Wu,Zhonghua Zhou,Yongfeng Tuo,Kai Wang,Min Huang,Yue Huang,Shirley Shen
A transparent film of carbon nano-tubes and TiO 2 composite (CNTs/TiO 2 ) with superhydrophobic and photocatalytic functions has been successfully fabricated on a glass substrate via a simple chemical liquid phase deposition method with adding CNTs dispersion liquid. The transmittance of CNTs/TiO 2 film deposited 16 h on glass substrate is 79% at the wavelength of 550 nm. After surface modified by fluorosilane, the contact angle reaches 160 ± 3° and sliding angle is less than 2°. The photocatalytic activity is much higher than that of a pure TiO 2 film as probe tested by UV degradation of methylene blue. Characterized by SEM, TEM, FTIR, AFM and UV–Vis, results show that i) the film has a structure of well-dispersed TiO 2 nanoparticles loaded oriented on CNTs with high surface roughness; ii) the formation of Ti–O–C chemical bonding; iii) Ti–O–C chemical bonding acts as a bridge and promotes mutual depositions of CNTs and TiO 2 , finally constructs hierarchical roughness with special micro- and nano-structures. The formation mechanism of self-assemble during the liquid phase deposition may also be extended to preparation of other CNTs/oxide composite function films.
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