APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qian Li,Jing Hu,Haiqiang Wang,Zhongbiao Wu
Limited light absorption and severe charge recombination have been widely acknowledged as the two main obstacles restricting the application of P25 in NO photocatalytic conversion. In this work, an advanced heterojunction photocatalyst of Bi/BiOI/black TiO 2 was synthesized via an in-situ solid-state chemical reduction method. The black TiO 2 extended the light absorption to the full spectral region. It constructed a direct Z-scheme heterojunction with BiOI nanosheets, not only promoting the charge separation, but also preserving the strong oxidation ability of photogenerated holes in black TiO 2 and strong reducing ability of photogenerated electrons in BiOI. Thus, more •O 2 − and •OH radical could form when Bi/BiOI/black TiO 2 was subjected to visible light irradiation. Besides, the introduced Bi metal nanoparticles could also enhance the light utilization and served as a cocatalyst to accept the electrons. Therefore, enhanced NO photocatalytic oxidation activity was obtained, with the optimal sample Bi/BiOI/black TiO 2 exhibiting a high NO conversion efficiency of ~70% and NO x removal of ~45%. This work may provide a refreshing perspective for the design of heterojunction photocatalysts for efficient NO photocatalytic purification and other photocatalytic applications.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Cheng Chen,Yu Zhao,Ting Lei,Dingming Yang,Yanfang Zhou,Jiawei Zeng,Ruzhen Xie,Wenyuan Hu,Faqin Dong
Photocatalytic removal of organic pollutants is a promising pollution treatment technology from the aspect of carbon neutrality . The complex diversity of actual wastewater components, as opposed to single-component systems, can significantly affect photocatalytic mechanisms. In this study, complex pollutant systems were created using various coordinating agents, and the effects of P25 on the photocatalytic removal of methyl orange (MO) in these systems and corresponding photocatalytic mechanism were investigated. The results show that photocatalytic removal of MO by P25 using ligands is significantly more efficient, especial removal of MO by the EDTA-P25 (P-E 2.5 ) coordination system resulted dramatically improved MO removal (97.4% versus 12.3% achieved by pure P25 after 15 min), with the reaction rate improved 23.8-fold. Theoretical calculations show that the effective coordination bonds formed by the coordinating agent and Ti atoms reduce the adsorption energy of P25 for MO. In addition, introduction of the coordinating agent EDTA reduces the transition state energy during the MO degradation process and greatly accelerates the reaction rate, and the conduction band position of the EDTA-P25 coordination system shifts to a more negative potential, which induces to the generation of •O 2 − for effective MO degradation.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jingting Su,Hui Lu,Fang Wang,Yu Lu,Ruohu Zhang,Jun Xiao,Yiping Cui,Li Zhu
Cooperative adsorption and degradation in situ, known as “hook and destroy” strategy, is an appealing idea to scavenge pollutants from water efficiently. However, commercial high-adsorption-capacity adsorbents are usually based on activated carbon, which is easily damaged in the pollutant degradation process, resulting in decreasing of the adsorption performance, while the adsorption capability of most inorganic adsorbents is inadequate for practical applications. To address the issues, we prepared a novel mesoporous titanium dioxide (m-TiO 2 ) by facile one-step hydrolysis method at room temperature. The m-TiO 2 exhibits both high adsorption capacity and short equilibrium time for a wide range of pollutants, such as dyes, pharmaceuticals and pesticides, due to its large surface area and abundant functional groups. The surface charge of the m-TiO 2 adsorbent can be regulated by adjusting the acidity and alkalinity of preparation conditions, hence the m-TiO 2 is capable of adsorbing either positively or negatively charged pollutants. The versatility for adsorption of diverse contaminants was demonstrated in the experiment of purifying lake water with multiple pollutants. More significant, the m-TiO 2 can be regenerated in minutes by in-situ degrading the adsorbed molecules using common oxidants, such as hypochlorite, the active ingredient of disinfectants. The adsorption performance has little deterioration in at least five successive cycles of adsorption and degradation. Considering the excellent adsorption performance, wide applicability and high recyclability, the mesoporous TiO 2 offers a sustainable approach to increasingly complex water environmental problems.
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
高影响因子
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2016
·Vol. 72
·期 1
·153-165
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IF 2.039
Ma Taowu,Wang Meng,Gong Shuangjiao,Tian Bin
The environmental factors are expected to affect the ecotoxicity of heavy metals in the presence of engineered nanoparticles (NPs) in aquatic ecosystems. However, in sediment scenario, little is known regarding their impacts on the ecotoxicity of co-exposure of sediment-associated heavy metals and NPs. This study evaluated the impacts of different levels of organic matter (OM) (4.8–11.6%) and pH (6–9) on the ecotoxicological effects of co-exposure of sediment-associated titanium dioxide nanoparticles (TiO 2 -NPs) and cadmium (Cd) to a freshwater gastropod Bellamya aeruginosa . The burdens of Ti and Cd and biomarkers of DNA damage, Na + /K + -ATPase, lipid peroxidation (LPO), and protein carbonylation (PC) in the hepatopancreas were determined following 21 days of exposure. At background level of OM (4.8%) in sediments, TiO 2 -NPs significantly promoted Cd accumulation in low-Cd treatments (5 mg/kg) but did not promote Cd accumulation in high-Cd treatments (25 mg/kg). At the relatively higher OM levels (7.1 and 11.6%), TiO 2 -NPs significantly enhanced Cd accumulation and toxicity as evidenced by aggravated DNA damage, decreased Na + /K + -ATPase activities, and increased LPO and PC levels. Moreover, Cd burdens in both low-Cd and high-Cd treatment were positively correlated with corresponding Ti burdens, indicating TiO 2 -NPs partially acted as carrier of Cd. At all pH levels, in low-Cd treatments, TiO 2 -NPs did not affect Cd accumulation, LPO, and PC levels but significantly enhanced DNA damage and slightly facilitated the inhibition of Na + /K + -ATPase activities. In high-Cd treatments, only at pH 9, TiO 2 -NPs significantly enhanced Cd accumulation and toxicity. Our results implied that interaction between TiO 2 -NPs and OM or pH significantly affected the accumulation and toxicity of Cd in B. aeruginosa , but the underlying mechanisms need further investigation. Additionally, it should be noted that the potential ecological risk of co-exposure of NPs and coexisting pollutants might be closely species-specific and related to environmental media.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
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IF 4.9
Hanjun Wu,Lan Hu,Zhenyue Zhang,Wenda Guo,Wendou Chen,Junxia Yu,Guoqing Feng,Ruan Chi,Zhiquan Pan
In this study, a novel trihydroxyl functionalized titanium dioxide (TiO 2 -NH 2 -3OH) was successfully synthesized by the Schiff base reaction method. TiO 2 -NH 2 -3OH was characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), x-ray Photoelectron Spectroscopy (XPS), x-ray diffraction techniques (XRD), and further applied to recover germanium (Ge(IV)) from coal acid leaching solution. TiO 2 -NH 2 -3OH exhibited superior capture performance on Ge(IV) at a pH of 3, and the optimal TiO 2 -NH 2 -3OH dosages were 0.8 g L −1 . The distribution coefficients of germanium for coexisting metal ions (Zn 2+ , Co 2+ , Mn 2+ , Ni 2+ and Al 3+ ) were all greater than 1, indicating that TiO 2 -NH 2 -3OH had good selective adsorption performance for Ge(IV) in complex solution environments. Compared with other kinetic models, pseudo-second-order model was more suitable to reveal the absorption of Ge(IV). Moreover, the experiment data were fitted better with Langmuir model at 298 K than the other isothermal models, and the maximum adsorption capacity was up to 72.94 mg g −1 . Thermodynamic data suggesting that the capture of Ge(IV) on TiO 2 -NH 2 -3OH was a spontaneous endothermic process, increasing the temperature was beneficial for the adsorption reaction to proceed. TiO 2 -NH 2 -3OH with saturated adsorption still maintained a high removal rate of 80.55 % of Ge(IV) after five cycles, indicating good stability and recyclability of TiO 2 -NH 2 -3OH. XPS analysis indicated that the capture of germanium by TiO 2 -NH 2 -3OH may be due to the ion exchange interaction between -OH and Ge(OH) 4 on the adsorbent surface. This work indicated that TiO 2 -NH 2 -3OH had great advantages and potential for the recovery of Ge(IV) from coal acid leaching solution.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 20
·48691
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IF 2.188
Shuning Chen,Jie Ai,Jiawen Chen,Jianrong Lin,Qinhui Chen
People are always puzzled by “white pollution” in recent decade. Recycling of waste styrofoam as a coating is a good sustainable solution to resolve this problem. However, the poor compatibility between inorganic additives and polymer hinders the application of recycled polystyrene. In this article, anisotropic Janus particles were used to increase the compatibility of titanium dioxide/waste styrofoam coatings. SEM results show that Janus particles can be anchored at the interface between styrofoam and titanium dioxide, increasing the dispersion of titanium dioxide, and improving the compatibility of inorganic particles and organic polymer. The glass-transition temperature of styrofoam coating increases from 77 °C to 89 °C in titanium dioxide/styrofoam contained 1 wt % of Janus particles, which certified that Janus particles have compatibilization on titanium dioxide/styrofoam coating. Attributing to this compatibilization, the tensile strength of titanium dioxide/styrofoam with 1 wt % of Janus particles rises about 45% compared with titanium dioxide/styrofoam. The yield stress, storage modulus, and viscosity of titanium dioxide/styrofoam contained 1 wt % of Janus particles are the smallest and the closest to Newtonian fluid. Janus particles used in the recycled styrofoam coating is benefit to expand the application of waste styrofoam and the new anisotropic Janus compatibilizer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 137 , 48691.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 16
·9836-9844
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IF 4.036
Zixu Ma,Beibei Yang,Junjiao Yang
Magnetic materials are being increasingly used in anti-counterfeiting coatings, but the dark colors of magnetic materials greatly limit their applications. This necessitates the development of light-colored magnetic materials. In this study, the heterogeneous precipitation method was used to deposit a layer of titanium dioxide (TiO2) on the surface of magnetic spherical metal particles, followed by the deposition of a layer of Ag by the reduction method, in order to achieve a light color. In the experiment, the particles were initially coated with a few tens of nanometers of TiO2 with a strong shading effect, followed by a further coating of Ag of the same thickness with a similar shading performance. Not only did this achieve a lighter color, but there was no reduction in the magnetic properties of the material after the application of the coating. Scanning electron microscopy (SEM), scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), X-ray diffractometry (XRD), and other methods were used to study the changes in morphology and composition before and after the magnetic material was coated. A magnetic tester was used to study the changes in magnetic strength before and after the magnetic material was coated.
研究领域:
材料科学
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表面化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Zishan Han,Changhyeok Choi,Song Hong,Tai-Sing Wu,Yun-Liang Soo,Yousung Jung,Jieshan Qiu,Zhenyu Sun
Renewable energy-driven electrochemical N 2 reduction reaction (NRR) provides a green and sustainable route for NH 3 synthesis under ambient conditions but is plagued by a high reaction barrier and low selectivity. To promote NRR, modification of the catalyst surface to increase N 2 adsorption and activation is key. Here, we show that engineering surface oxygen vacancies of TiO 2 permits significantly enhanced NRR activity with an NH 3 yield rate of about 3.0 μg NH3 h −1 mg cat. −1 and a faradaic efficiency (FE) of 6.5% at -0.12 V ( vs . the reversible hydrogen electrode, RHE). Efficient conversion of N 2 to NH 3 is achieved in a wide applied potential range from -0.07 to -0.22 V ( vs . RHE) with NH 3 production rates ≥ 2.0 μg NH3 h −1 mg cat. -1 and NH 3 FEs ≥ 4.9%, respectively. An NH 3 FE as high as 9.8% is obtained at a low overpotential of 80 mV. Density functional theory calculations reveal that the surface oxygen vacancies in TiO 2 play a vital role in facilitating electrochemical N 2 reduction by activating the first protonation step and also increasing N 2 chemisorption (relative to *H).
研究领域:
材料科学
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电化学
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能源科学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
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IF 3.849
Mengyu Li,Ning Liu,Jinhang Chen,Qiaoling Li
Based on biological inspiration, we proposed a simple method for preparing anti-corrosion and super-hydrophobic coating. The modified TiO 2 compounded ZnO and epoxy resin were prepared by one-pot method. The surface morphology, resistance, super-hydrophobicity, repairability, impedance, wear resistance, etc. of the prepared material were performed by SEM, FTIR, electrochemical workstation, contact angle, rolling angle measuring instrument and simple homemade devices. As a result, it was found that the coating had full-thickness hydrophobicity, its WCA was up to 155.6°, and its repairability was good. Even in a harsh environment, it still had a long working life. At the same time, it had been found that the key to prolonging the anti-corrosion life of the coating lies in the reduction of the volume of the free polymer, the degree of cross-linked curing of the metal-polymer interior and its bonding with the metal substrate.
研究领域:
材料科学
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生物学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2023
·
IF 3.2
Ti Gang,Fan Yi,Tang Jian,Niu Chenguang,Xiong Xiaoyan
The morphology of dispersed particles has been proven to have a significant impact on performance of electrorheological (ER) materials, while there is a lack of relevant research on its impact on the properties of electrorheological elastomers (EREs). In this study, the TiO2 particles with spherical, short rod, and long rod shape were fabricated with sol-gel method, and the EREs were prepared with these three kinds of particles as dispersion phase. Particle characterization results show that the rod-shape TiO2 particles with larger average size exhibit a combination of anatase and brookite phase. The viscoelastic properties of three types of EREs under varying strain amplitude and shear frequency were tested. The results indicate that the long rod-shape TiO2 particles filled EREs shows higher storage modulus G′ and higher relative ER effect within the electric field from 0 to 3 kV/mm. The observations indicate the use of rod-shape TiO2 particles in the form of brookite phase may help enhance the ER properties of elastomers. The investigation contributes to the designing, preparation, and application of anisotropic ERE.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Anyang Tang,Weilun Qian,Junfeng Kong,Wenyu Feng,Huazhen Cao,Huibin Zhang,Guoqu Zheng
A highly effective, stable, and recyclable adsorbent based on titanium dioxide nanofibers (TNFs) was fabricated via a one-step hydrothermal synthesis. The application of TNFs for the deep removal of thallium (Tl) from ammonium perrhenate (NH 4 ReO 4 ) solutions was investigated. The effect of different factors, including hydrothermal temperature and time (120–170 °C, 4–10 h), adsorbent surface area (3–12 cm 2 ), initial concentration of Tl(III) (2–10 mg/L) and pH (2–10) on the removal performance, was analyzed using batch adsorption experiments. Kinetic analysis revealed that the removal process followed a pseudo-first-order model. The adsorption data of TNFs were analyzed using Freundlich and Langmuir isotherms, with the Langmuir isotherm showing the best fit and indicating a theoretical maximum adsorption capacity of 767.2 mg m −2 . Thermodynamic studies demonstrated the adsorption process was characterized by physisorption, being spontaneous, and exothermic. Under optimized conditions, TNFs demonstrated successful removal of Tl(III) from NH 4 ReO 4 solutions with limited adsorption of rhenium (Re) and arsenic (As) ions. Acidity and reusability tests confirmed the significant stability and excellent recoverability of TNFs. The proposed TNFs serve as an effective, and stable adsorbent with a high affinity for Tl(III), offering a viable and efficient approach for the purification of NH 4 ReO 4 solutions.
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
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xiang Gong,Zhao Jiang,Tao Fang
N-ethylcarbazole/dodecahydro-N-ethylcarbazole (NECZ/12H-NECZ) was a promising system for hydrogen storage applications. 1.0 wt% Pt/TiO 2 was regarded as the optimal loading in Pt/TiO 2 catalyst applied in the 12H-NECZ dehydrogenation reaction. The hydrogen release amount, selectivity to NECZ and TOF of 12H-NECZ dehydrogenation are 5.75 wt %, 98% and 229.73 min −1 at 453 K. Compared with the commercial 5.0 wt% Pd and Pt-based catalysts, it exhibited very high activity, selectivity and stability for 12H-NECZ dehydrogenation with low Pt loading. Combined with the XRD , XPS , HRTEM , TPR analysis, it was indicated that the enhanced catalytic performance was due to the SMSI (strong metal-supporting interaction) between Pt and TiO 2 support, which accelerated the rate-limiting step and enhanced the whole dehydrogenation reaction. This work may be beneficial for the commercial application of Pt/TiO 2 catalysts in the Liquid Organic Hydrogen Carrier (LOHC) system.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）