MATERIALS LETTERS
·
2014
·
IF 2.269
Xiaorui Zhang,Lizhu Liu,Jinfeng Li,Ling Weng,Weiwei Cui
TiO 2 –polyester composite emulsions with low contact angle on steel sheet were prepared in a “core-shell” structure employing ultrasonic irradiation. The cluster size of the TiO 2 was reduced and the nano-particles were well dispersed. The molecular weight of the polyester resin initially decreased, then increased forming the characteristic core-shell structure. This was a clear indication that the TiO 2 particles were coated with the recombined polyester as a direct result of the ultrasonic irradiation. The contact angle of the emulsion was reduced which indicated that the wettability of the emulsion was improved without the addition of chemical additives. These results suggest the possibility of producing low contact angle coatings by mechanical way.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2023
·Vol. 17
·期 8
·1-10
·
IF 6.4
Zhang Zhou,Huo Kai,Yan Tingxuan,Liu Xuwen,Hu Maocong,Yao Zhenhua,Liu Xuguang,Ye Tao
Photocatalytic degradation is a promising way to eliminate dye contaminants. In this work, a series of TiO 2 /ZSM-11 (TZ) nanocomposites were prepared using a facile solid state dispersion method. Methyl orange (MO), methylene blue (MB), and rhodamine B (RhB) were intentionally chosen as target substrates in the photocatalytic degradation reactions. Compared to pristine TiO 2 , negative effect was observed on MO degradation while promoted kinetics were collected on MB and RhB over TZ composites. Moreover, a much higher photocatalytic rate was interestingly achieved on RhB than MB, which indicated that a new factor has to be included other than the widely accepted electrostatic interaction mechanism to fully understand the selective photodegradation reactions. Systematic characterizations showed that TiO 2 and ZSM-11 physically mixed and maintained both the whole framework and local structure without chemical interaction. The different trends observed in surface area and the photo-absorption ability of TZ composites with reaction performance further excluded both as the promotion mechanism. Instead, adsorption energies predicted by molecular dynamics simulations suggested that differences in the adsorption strength played a critical role. This work provided a deep mechanistic understanding of the selective photocatalytic degradation of dyes reactions, which helps to rationally design highly efficient photocatalysts.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3519-3527
·
IF 1.093
Teng Wei,Wang Youmei,Lin Qin,Zhu Hui,Tang Yubin,Li Xinyong
Molybdenum disulfide (MoS2), as a typical layered transition metal sulfide, has been widely used in photocatalysis. Here, we report layered MoS2 nanosheet-coated TiO2 heterostructures that were prepared using a simple photo-assisted deposition method.
The as-prepared samples were investigated in detail by using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results demonstrated that the MoS2 nanosheets uniformly covered the outer surface
of TiO2. The visible light-sensitive photocatalytic activity was evaluated by the removal of methylene blue (MB) and 2-chlorophenol (2-CP) in aqueous solution. Thus, the MoS2/TiO2 heterostructures exhibited improved photocatalytic degradation activity under
visible light compared with the pure TiO2. Under visible light irradiation for 90 min, the degradation efficiencies of MB and 2-CP over the MoS2/TiO2 sample (sunlight irradiation time: 30 min) are as high as 93.6% and 70.6%, respectively. Furthermore, the corresponding
mechanism of enhanced photocatalytic activity is proposed on the basis of the comprehensively investigated results from the radical trapping experiments, photoluminescence spectroscopy, and electron spin resonance analysis. The hole oxidation, hydroxyl radicals, and superoxide anion radicals
act as the active species simultaneously in the photodegradation of the dye molecules. However, of these species, hole oxidation played the most important roles in the photocatalytic reaction.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
·
2015
·
IF 2.523
Lijie Wang,Xi Zhang,Peng Zhang,Zetan Cao,Junhua Hu
Mn doped TiO 2 was synthesized by hydrothermal treatment of titanium boride and manganese chloride. The doped nano powders were fabricated by adding ammonium water into the mother solution which was obtained hydrothermally. The calcination of precursory powders took place at the temperature of 400–600 °C which resulted in the formation of anatase with a small amount of rutile phase. The shift of valence band maximum (VBM) toward the lower binding energies was observed by measuring the position of VBM with reference to the Fermi level, which contributed to the significant red-shift of absorption edges. X-ray photoelectron spectroscopy (XPS) measurement shows that manganese exists in both 4+ and 3+ valance states, which may have a temperate replacing of Ti 4+ because of the charge compensation compared with 2+ and 3+ valence states. The property of photoelectric conversion was detected by evaluating the photocurrent under visible light (>420 nm), and the fluorescence spectra also proved that 6%-Mn doped TiO 2 (DM6) shows a better photoelectric conversion performance.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Liqi Xiao,Zean Xie,Shaojia Song,Zhiping Zhao,Ming Ke,Weiyu Song,Zhen Zhao,Jian Liu
Recently, coordinated unsaturated TiO2 due to the oxygen vacancy has been found to have good application prospects in propane dehydrogenation (PDH) reactions. The oxygen vacancy can be effectively adjusted by metal doping into TiO2. In the present paper, density functional theory calculations were conducted to study the PDH reaction of TiO2 doped with transition metals in the fourth period with the aim to screen for an effective doping metal. A good linear relationship was found between the calculated turnover frequency and co-adsorption energy of H and Propyl species, justifying such co-adsorption energy as a useful descriptor for screening PDH catalysts. Compared with pure-phase TiO2, V-doped TiO2 exhibits a lower propane C–H bond breaking energy barrier (0.93 eV) and a higher TOF (5.67 × 10–3 s–1) value. According to the calculation results, the V-doped TiO2 catalyst was successfully synthesized. The experimental results show that the r(C3H6) rises with V doping.
研究领域:
材料科学
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化学工程
·
催化反应
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 7
·2045-2055
·
IF 2.482
Li Chaoqun,Yang Yang,Ren Wei,Wang Jian,Zhu Tingyu,Xu Wenqing
Abstract CO is toxic and detrimental to human beings and the atmosphere. The presence of CO has become one of the important indicators for evaluating ambient air quality. Iron and steel sintering generate large amounts of flue gas emissions containing approximately 1% CO, which has become an important factor restricting the improvement of air quality in steel cities. The catalytic oxidation method is the simplest and most effective method for CO emission control. In this work, a series of Cu x Ce y /TiO 2 catalysts with different Ce doping levels were prepared by a one-step impregnation method and subsequently tested for catalytic CO oxidation. The Cu 0.5 Ce 0.5 /TiO 2 sample has the best catalytic activity under the conditions of 1% CO and 10% H 2 O. The catalysts were next characterized by XRD, BET, TEM, H 2 -TPR, XPS and in-situ DRIFTS methods. The characterization results show that Ce doping promotes the dispersion of copper species on the catalyst surface and improve the redox performance of the catalyst. The results of in-situ experiments showed that both Cu/TiO 2 and Cu 0.5 Ce 0.5 /TiO 2 catalysts followed Mars and van Krevelen mechanism, and Ce doping enhanced the adsorption and activation of oxygen, thus improving the low-temperature reaction activity of the catalysts. Graphic Abstract
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Journal of Bionic Engineering
·
2022
·Vol. 20
·期 3
·900-909
·
IF 2.995
Zhong Xin,Guo Zhiguang
Oil–water mixing has brought many problems to a society, and it is of great significance to develop a simple, convenient, efficient, and durable separation material to solve the problem of oil–water mixing. In this paper, modified cottons were successfully prepared using polydopamine as the in situ mineralization site of TiO 2 nanoparticles combined with synergistic crosslinking with KH550. A large number of hydrophilic groups endowed the cotton with superhydrophilic ability, which greatly shortened its water spreading time. The prepared modified cotton could be successfully separated from oil and water, and still had a separation efficiency of 99.999% after 50 cycles. In addition, after 24 h immersion in 1 M HCl, NaOH, and NaCl solutions and 50 abrasion experiments, the modified cotton showed excellent oil–water separation ability, and the separation efficiency was above 99.990%. Successfully provided a simple preparation method to prepare high-efficiency and clean cottons for oil–water separation.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shizhen Liu,Yajun Wang,Shaobin Wang,Mingmu You,Song Hong,Tai-Sing Wu,Yun-Liang Soo,Zhenqing Zhao,Guiyuan Jiang,Jieshan Qiu,Baojun Wang,Zhenyu Sun
Photocatalysis shows a great potential for N2 fixation to NH3 under mild conditions, which intrigues increasing research attention in recent decades. To this end, the design of efficient photocatalysts is the key. Herein, we report the synthesis of single atom Ru decorated TiO2 nanosheets rich in oxygen vacancies. Single Ru sites greatly promoted photoreduction of aqueous N2 to NH3, affording an NH3 formation rate of 56.3 μg/h/gcat. We found that isolated Ru atoms likely weakened the hydrogen evolution, promoted absorption of N2, and also improved the charge carrier separation, which led to enhanced N2 photofixation.
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 ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Mingxuan Sun,Yalin Fang,Ying Wang,Shanfu Sun,Jia He,Zhi Yan
A ternary composite of Cu 2 O, graphene and rutile TiO 2 nanorods was prepared using Cu(CH 3 COO) 2 ·H 2 O, graphene oxide and TiCl 4 as the starting materials and its enhanced photocatalytic performance was demonstrated. Graphene/TiO 2 nanorod composites (GT) were obtained by a simple hydrothermal method and then, Cu 2 O was coupled onto the surface of graphene/rutile TiO 2 to form Cu 2 O/graphene/rutile TiO 2 nanorod (CGT) composites via a chemical bath deposition process. The as-prepared sample was characterized by X-ray diffraction (XRD), emission field scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), specific surface area analyzer (BET), Raman spectroscopy and ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS). It is found that the introduction of graphene and Cu 2 O has little effect on the morphology of TiO 2 nanorods with average dimensions of 140 nm (length) × 30 nm (diameter) (L/D ratio ≈5). A red shift of light absorption edge and more absorption in the visible light region were observed for the resulted ternary samples compared with TiO 2 and graphene/TiO 2 composites. The photocatalytic activity was evaluated by the photodegradation of methylene blue under visible light irradiation, which showed 2.8 times corresponding enhancement of the degradation efficiency for the ternary composites compared with TiO 2 . This work provides a new strategy to improve the visible light response of TiO 2 and facilitate its application in environmental remediation.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Junjie Zhang,Hongbo Tan,Xiufeng Deng,Maogao Li,Shouwei Jian,Guangyan Li
High agglomeration and low adsorption limited the photocatalytic efficiency of TiO 2 . Hereupon, organic montmorillonite (OMt) was used as the support to load TiO 2 , with a view to achieve the homogeneous dispersion of nanoparticles and obtain the photocatalyst with mesoporous structure. In the present study, three kinds of expanding agents were used to prepare OMt, and then OMt/TiO 2 was produced by the process of diffusion, hydrolysis, and calcination. The microscopic properties were researched and the removal capability for methylene blue (MB) under simulated UV was discussed. Results showed that with the use of expanding agents, the basal spacing of montmorillonite (Mt) was enlarged significantly, and the biggest value was up to 4.35 nm. The optimal photoactivity of OMt/TiO 2 was observed after calcinating at 600 °C, which was much higher than that of Mt/TiO 2 and single TiO 2 . On the one hand, in comparison with Mt/TiO 2 , TiO 2 content in OMt/TiO 2 was increased by more than 358%, and the increase ratio for pore volume was 69%. On the other hand, in comparison with single TiO 2 , the mesoporous structure of OMt/TiO 2 improved the adsorption capacity for MB. Moreover, the surface of charge separation efficiency of TiO 2 was promoted by the presence of OMt, accelerating the photocatalytic removal of MB. Hence, the combination of OMt and TiO 2 could efficiently enhance photoactivity.
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
PROGRESS IN ORGANIC COATINGS
·
2010
·
IF 1.669
Xiang-Chen Che,Yu-Zi Jin,Youn-Sik Lee
Stable nano-TiO 2 /polyurethane (PU) emulsions were prepared via in situ reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization of 2-hydroxyethyl acrylate (HEA)-capped PU macromonomer, using azobisisobutyronitrile (AIBN) as a radical initiator and 2-{[(butylsulfanyl)carbonothioyl]sulfanyl} propanoic acid (BCSPA) anchored onto TiO 2 nanoparticles (TiO 2 -BCSPA) as a RAFT agent. When the molar ratio of AIBN to TiO 2 -BCSPA was changed from 1:3 to 1:10, the polydispersity index (PDI) of polymers in the emulsions decreased from 1.83 to 1.06, due to more effective RAFT polymerization in the emulsions. The TiO 2 nanofillers were well-dispersed throughout the polymer films . The tensile strengths of the nanocomposite films were significantly enhanced due to coordination bonding between the TiO 2 nanofillers and the –COOH end groups of the polymers, as evidenced by the FT-IR spectral data.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 3
·312
·
IF 3.52
Zhiwen Xi,Zhe Hong,Fangtao Huang,Zhirong Zhu,Wenzhi Jia,Junhui Li
A series of Pt/WOx-ZrO2-TiO2catalysts with different Ti/Zr molar ratios was prepared by an evaporation induced self-assembly method, and used to efficient hydrogenolysis of glycerol to 1-PO and 1,3-PDO. BET, XRD, Raman, TEM, XPS and Py-IR were employed to characterize the physicochemical properties of the catalysts. The structural and acidic properties of the catalysts were affected by the Ti/Zr ratio of the support ZrO2-TiO2. Two new crystalline phases of ZrTiO4and Ti2ZrO6and the amount of acid sites were detected in the Pt/WOx-ZrO2-TiO2catalysts. 1-PO is dominant in all products of glycerol hydrogenolysis over the supported Pt-WOx catalysts, which is attributed to more Lewis acid sites on the catalyst surface. The Pt/WOx-ZrO2-TiO2catalyst with a Ti/Zr ratio of 7/3 showed the highest 1,3-PDO yield (25.3%) and 1-PO yield (42.3%), due to its more acid sites including Brønsted and Lewis, and higher concentration of surface Pt0.Keywords:hydrogenolysis of glycerol;1,3-propanediol;1-propanediol;Pt-WOx;ZrO2-TiO2
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 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）