MOLECULES
·
2023
·Vol. 28
·期 13
·5170
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IF 4.6
Jinyuan Zhu,Yingying Zhu,Yifan Zhou,Chen Wu,Zhen Chen,Geng Chen
The direct or indirect discharge of organic pollutants causes serious environmental problems and endangers human health. The high electron–hole recombination rate greatly limits the catalytic efficiency of traditional TiO2-based catalysts. Therefore, starting from low-cost activated carbon (AC), a photocatalyst (F-Si-TiO2/AC) comprising fluorine (F)- and silicon (Si)-doped TiO2loaded on AC has been developed. F-Si-TiO2/AC has a porous structure. TiO2nanoparticles were uniformly fixed on the surface or pores of AC, producing many catalytic sites. The band gap of F-Si-TiO2/AC is only 2.7 eV. In addition, F-Si-TiO2/AC exhibits an excellent adsorption capacity toward methyl orange (MO) (57%) in the dark after 60 min. Under the optimal preparation conditions, F-Si-TiO2/AC showed a significant photodegradation performance toward MO, reaching 97.7% after irradiation with visible light for 70 min. Even under the action of different anions and cations, its degradation efficiency is the lowest, at 64.0%, which has good prospects for practical application. At the same time, F-Si-TiO2/AC has long-term, stable, practical application potential and can be easily recovered from the solution. Therefore, this work provides new insights for the fabrication of low-cost, porous, activated, carbon-based photocatalysts, which can be used as high-performance photocatalysts for the degradation of organic pollutants.Keywords:F-Si-TiO2;methyl orange;visible light;doped;electronic cage
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 7
·4811-4817
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IF 3.201
Weiwei Chen,Shan Yu,Yunqian Zhong,Xiang-Bing Fan,Li-Zhu Wu,Ying Zhou
Quantum dot (QD)/TiO2 composites are widely used materials in the field of photocatalysis. However, the influence of different exposed facets of TiO2 in composites on photocatalytic hydrogen evolution is rarely reported. In this work, CdSe QD–TiO2 composites with dominant {001} or {101} faceted anatase were synthesized and specifically characterized using X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Photocatalytic hydrogen evolution tests reveal that {001}-TiO2/CdSe QDs exhibit a 213.1- and 9.0-fold increase in photocatalytic activity compared to {001}-TiO2 and CdSe QDs, respectively. Notably, the photocatalytic activity of {001}-TiO2/CdSe QDs is 2.2 times higher than that of {101}-TiO2/CdSe QDs. Based on the results from UV-Vis diffuse reflectance spectroscopy, Brunauer–Emmett–Teller surface area testing, Mott–Schottky testing and steady-state and time-resolved emission spectroscopy, the main reason for enhanced photocatalytic activity is the faster electron transfer from CdSe QDs to {001}-TiO2 compared with to {101}-TiO2. This research on tailored facets in QD/TiO2 composites provides primary insights for the design of effective photocatalysts.
研究领域:
材料科学
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光催化
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Shen Shen,Jia Jia Fu,Hong Bo Wang
Exploring desirable and photostable homostructured catalysts is an explosive scientific hotspot for energy crisis and wastewater treatment . Efficient pollutants removal from wastewater is an attractive route to sustainable development. We here present an ideal photocatalyst that incorporates both g-C 3 N 4 and TiO 2 sheets (TNs), creating a novel nanomaterial of the type g-C 3 N 4 /TNs catalyst. The obtained photocatalyst can accelerate the interfacial charge transfer rate. Subsequently, we prepared 2:1O − -g-C 3 N 4 /TNs photocatalysts by H 2 treatment, which not only generated more active defects on 2:1O − -g-C 3 N 4 /TNs surface, but also produced oxygen vacancies . As measured by the degradation of CR (CR), the as-prepared g-C 3 N 4 /TNs samples perform outstanding removal properties due to high photocurrent response under visible light irradiation, which are transcend than bulk g-C 3 N 4 or pure TNs separately. Specially, the obtained 2:1O − -g-C 3 N 4 /TNs catalysts exhibit the highest photocatalytic rate for decomposition of CR (86.7%, 2 h), which was 107.5, 7.167, and 1.43 times higher than that of TNs, g-C 3 N 4 , and 2:1 g-C 3 N 4 /TNs. The decisive factor in enhancing the photocatalytic ability of this optimal sample is the richly available reaction sites exposed by hydrogenation process .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 5
·365
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IF 4.3
Yijie Shen,Zhe Liu,Renke Bi,Bianbian Zhou,Yan Wang,Jialong Liu,Zhiyu Wang,Bing Han
Photodegradation of antibiotics based on photocatalytic semiconductors is a promising option to alleviate water pollution. Despite its limitations, TiO2-based photocatalysts are still the most widely studied materials for pollutant degradation. In this work, a pomegranate-like g-C3N4/C/TiO2nano-heterojunction was constructed using the hydrothermal–calcination method, consisting of interconnected small crystals with a dense structure and closely contacted interface. Low-crystallized carbon filled the gap between TiO2and g-C3N4, forming a large interface. The local in-plane heterostructures generated by C/g-C3N4are further improved for carrier transport. As expected, the optimal sample calcined at 300 °C (GTC-300) efficiently eliminated tetracycline hydrochloride (TC-HCl, 20 mg L−1), achieving a removal rate of up to 92.9% within 40 min under full-spectrum irradiation and 87.8% within 60 min under the visible spectrum (λ > 400 nm). The electron mediator, low-crystallized carbon, successfully promoted the formation of new internal electric fields via the widespread heterojunction interface, which accelerated the separation and migration of photogenerated carriers between g-C3N4and TiO2. These results confirm that the g-C3N4/C/TiO2nano-heterojunction exhibited outstanding photodegradation performance of TC-HCl. The electron mediator shows great potential in promoting carrier transfer and enhancing photocatalytic performance of heterogeneous photocatalysts in water treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Guozhong Zhang,Shuqu Zhang,Longlu Wang,Ran Liu,Yunxiong Zeng,Xinnian Xia,Yutang Liu,Shenglian Luo
The scrupulous design of hierarchical structure and highly active crystal facets exposure is essential for the creation of photocatalytic system. However, it is still a big challenge for scrupulous design of TiO 2 architectures. In this paper, bird’s nest-like anatase TiO 2 microstructure with exposed highly active (001) surface has been successfully synthesized by a facile one-step solvothermal method. Methylene blue (MB) is chosen as a model pollutant to evaluate photocatalytic activity of as-obtained TiO 2 samples. The results show that the photocatalytic activity of the bird’s nest-like sample is more excellent than P25 in the degradation of MB due to high specific surface area and highly active (001) crystal facets exposure when tested under simulated solar light. Besides, it can be readily separated from the photocatalytic system by sedimentation after photocatalytic reaction, which is a significant advantage against conventional powder photocatalyst. The bird’s nest-like microspheres with novel structure may have potential application in photocatalysis and other fields.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 2
·1181-1190
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IF 3.119
Weidong Peng,Chun Yang,Jiang Yu
A facile and feasible method was successfully utilized to incorporate Bi2O3 and g-C3N4 quantum dots on TiO2 surface to synthesize a novel composite g-C3N4/TiO2/Bi2O3. The photocatalytic activity of the composite g-C3N4/TiO2/Bi2O3 for degradation of dyes under sunlight and UV light irradiation was evaluated. It possessed the higher photocatalytic performance than that of pristine TiO2 or g-C3N4 under the same conditions. Under sunlight irradiation, the reaction rate constants of the g-C3N4/TiO2/Bi2O3 was about 4.2 times and 3.3 times higher than that of TiO2 and g-C3N4, respectively. The promising photocatalytic performance was attributed to the broader light absorption range and efficient separation of photoinduced carriers. Moreover, based on the TEM, XPS, XRD, UV-vis spectrum, radicals scavenging test and Mott–Schottky analysis systematic mechanism for photodegradation process was proposed. This work provides a promising strategy for the modification of TiO2-based semiconductors by incorporating different quantum dots and promoting the efficiency of the photocatalysts in practical application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 43
·20777-20785
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IF 3.925
Yanke Yu,Mengqiao Geng,Desheng Wei,Chi He
Selective catalytic oxidation of NH3 (NH3-SCO) is a promising method to reduce NH3 pollution. The Pt-based catalysts exhibited excellent activity in the NH3-SCO reaction under low temperatures. However, it was easy for the NH3 to be oxidized to N2O and NOx (NO and NO2) over the Pt-based catalyst, causing a low N2 selectivity. The CuSO4, which could supply both Brønsted and Lewis acid sites on the catalyst, was used to promote N2 selectivity. The N2 adsorption–desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), inductively coupled plasma mass spectrometry (ICP-MS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD), H2-temperature programmed reduction (H2-TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were used to characterize the catalyst. The addition of CuSO4 could suppress the formation of N2O and NOx, thus the highest N2 selectivity on the catalyst increased from 21.2% to 78.1%. An imide mechanism was the main reaction mechanism on the Pt/TiO2 catalyst. After adding CuSO4, the NH3-SCO reaction over the CuSO4-Pt/TiO2 catalyst mainly followed an i-SCR mechanism where NH3 was oxidized to N2O and NOx, and then the newly formed N2O and NOx were reacted with NH3/NH4+ adsorbed on the Lewis and Brønsted acid sites via an NH3-SCR reaction over the catalyst, and finally N2 was formed. The acid sites performed an important role in the formation of N2 and this work should provide an effective method to promote N2 selectivity in a NH3-SCO reaction.
研究领域:
催化化学
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环境科学
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DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
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2023
·Vol. 159
·期 12
·
IF 4.4
Liu Huimin,Yuan Chenyi,Wu Shipeng,Sun Chao,Huang Zhen,Xu Hualong,Shen Wei
Surface property modification of catalyst support is a straightforward approach to optimize the performance of supported noble metal catalysts. In particular, oxygen vacancies and hydroxyl groups play significant roles in promoting noble metal dispersion on catalysts as well as catalytic stability. In this study, we developed a nanoflower-like TiO 2 -supported Pd catalyst that has a higher concentration of oxygen vacancies and surface hydroxyl groups compared to that of commercial anatase and P25 support. Notably, due to the distinctive structure of the nanoflower-like TiO 2 , our catalyst exhibited improved dispersion and stabilization of Pd species and the formation of abundant reactive oxygen species, thereby facilitating the activation of CO and O 2 molecules. As a result, the catalyst showed remarkable efficiency in catalyzing the low-temperature CO oxidation reaction with a complete CO conversion at 80 °C and stability for over 100 h.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Advanced Energy and Sustainability Research
·
2023
·Vol. 4
·期 7
·2300002
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IF 5.8
Gang Cheng,Shuo Li,Chunyan Wang,Jinyan Xiong
TiO 2 –based photocatalysis system for splitting water into hydrogen offers a sustainable and green technology to produce clean hydrogen energy. However, pristine TiO 2 still exists inherent shortcomings restricting its practical applications. Herein, the impact of postprocessing approaches of protonic titanate on engineering of oxygen vacancy and photocatalytic hydrogen evolution of TiO 2− x is studied. Subsequently, interfacial cocatalysts are successfully involved in the optimized TiO 2− x for enhanced photocatalytic hydrogen evolution. TiO 2− x with the highest photocatalytic hydrogen evolution performance of 3112.09 μmol g −1 h −1 , denoted as TiO 2 –C, is selected to adjust the interface with Cu and MoS 2 respectively. Cu–TiO 2 –C and MoS 2 –TiO 2 –C composites are synthesized to enhance the separation ability of photogenerated electron-hole pairs and significantly improve the photocatalytic hydrogen evolution performance. The photocatalytic hydrogen evolution rates of 5 wt% Cu–TiO 2 –C and 40 wt% MoS 2 –TiO 2 –C are 9225.75 and 5765.48 μmol g −1 h −1 , respectively. It is proved that different postprocessing methods can tune the content of oxygen vacancy in TiO 2− x and regulate the photocatalytic hydrogen evolution performance of TiO 2− x materials. The interface regulation of the cocatalyst also contributes to the separation of photogenerated electron-hole pairs and serves as active sites to enhance hydrogen evolution performance.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Journal of Experimental Nanoscience
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2021
·
IF 3.075
Zhiwei Pan,Xinru Zhu,Hong Jiang,Yefei Liu,Rizhi Chen
Flexible and hierarchical nanostructured Pd/SiO2-TiO2 nanofibrous catalytic membranes were fabricated via combining electrospinning technique and a two-step hydrothermal method. The size and distribution of TiO2 nanorods immobilised on SiO2 nanofibrous membranes can be regulated via adjusting the dosage of TiCl3 solution in the first step hydrothermal process. When using an optimal TiCl3 solution dosage of 0.2 mL, a hierarchical structured Pd/SiO2-TiO2-0.2 nanofibrous catalytic membrane with uniformly dense TiO2 nanorods loaded on SiO2 nanofibers is obtained, and still shows good tensile strength and flexibility. The catalytic activity of Pd/SiO2-TiO2-0.2 increases 5 times as compared to Pd/SiO2-TiO2-0 in the reduction of p-nitrophenol (PNP) to p-aminophenol (PAP). The modification with TiO2 nanorods can provide more surface areas for loading the Pd nanoparticles, thereby increased active sites. The three-dimensional open-cell network stacked and assembled by thousands of SiO2 nanofibers and TiO2 nanorods enhances the contact between the reactants and Pd nanoparticles. Both aspects contribute the superior catalytic activity of Pd/SiO2-TiO2-0.2. Furthermore, a continuous and complete conversion of PNP to PAP can be stably operated over 240 min in a gravity-driven catalytic membrane reactor constructed by Pd/SiO2-TiO2-0.2.
研究领域:
材料科学
·
催化
·
纳米技术
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jianhua Li,Senyan Wang,Bing Chen,Guotao Pan,Guoge Zhang,Zhao-Bin Ding,Yan Liu
In this work, by integrating TiO2 nanoparticles and sodium carboxymethyl cellulose (CMC) binder, a green bifunctional TiO2 nanostructured coating (T-SCMC-vac.) directly coupled with 304SS was designed under vacuum thermal treatment, aiming to achieve methyl orange degradation and metal anticorrosion. The T-SCMC-vac. nanostructured coating exhibited a reaction constant 1.7 times higher for degrading methyl orange compared with its counterpart in the simulated seawater environment, demonstrating good photocatalytic performance. Simultaneously, T-SCMC-vac. provided effective photocathodic protection to 304SS. The open circuit potential negatively shifted to −500 mV (vs Ag/AgCl), and the photoresponse current and corrosion current densities reached approximately 10 μA cm–2. Furthermore, the nanostructured coating showed good stability, as evidenced by 98% retention in photocatalytic capability after five cycles and by 14 h long-term photocathodic protection. The experimental results and theoretical calculations suggest that the enhanced performance can be attributed to the chemical interaction between TiO2 nanoparticles and CMC via C–O–Ti bonds, which significantly facilitated photogenerated carrier transport and aligned the potential positions of TiO2, reactive oxygen species, and 304SS. Our findings provide a facile strategy for designing green bifunctional TiO2 nanostructured coatings on ocean-based facilities with seawater pollutant degradation and metal anticorrosion properties.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2010
·Vol. 6
·期 19
·4800-4806
·
IF 4.869
Peng Tan,Jiping Huang,Dakang Liu,Wenjia Tian,Luwei Zhou
We fabricated TiO2 nanoparticles modified by a thin salt solution layer. The suspensions, formed by the nanoparticles in silicone oil, serve as model systems for exploring very general theories about interactions between colloidal particles with arbitrary ions confined on surfaces in the presence of an applied electric field. The system showed a static-yield-stress peak, not found before. The peak can be manipulated by tuning the amount of cations and anions confined in the salt solution layer. Excellent agreement between our experiment and theory reveals the mechanism concerning the competition between ions' polarized trapped state and conductively transmitted state. This work makes it possible to manipulate colloidal interactions by confining exogenous ions appropriately, and it is expected to have applications in colloidal science, materials engineering, and biotechnology.
研究领域:
胶体科学
·
材料工程
·
生物技术
✓ 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）