MATERIALS RESEARCH BULLETIN
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2024
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IF 5.3
Yunfei Yang,Hongfang Shen,Congcong Ma,Bo Ma,Dong Li,Haibo Li,Youjun Lu,Yanmin Wang
It remains a huge challenge to design a kind of high performance, multifunctional and low cost photocatalysts driven by visible light for the remediation of pollutants from waste water. In this work, the carbon coated Tb 2 O 3 /Er 2 O 3 /TiO 2 nanotubes (Tb 2 O 3 /Er 2 O 3 /TiO 2 @C) 0D/1D hybrid photocatalysts were synthesized by a microwave hydrothermal method. Essentially, the Er 2 O 3 nanoparticles can absorb low-energy photons at 800–980 nm and emit high-energy photons to TiO 2 through the up-conversion effect, meanwhile, the Tb 2 O 3 act as a redox center to promote the separation of photoinduction charges since the instantaneous photoelectric density was increased by 10 times by compared to TiO 2 @C. As a result, the photodegradation efficiency of the optimized Tb 2 O 3 /Er 2 O 3 /TiO 2 @C photocatalysts is about 15.7 times higher than that of TiO 2 @C under visible light irradiation for decomposing rhodamine B, respectively. Moreover, the photodegradation efficiency remained above 70 % after reused for 5 times. Thus, the enhanced synergistic effect between Er 2 O 3 and Tb 2 O 3 promises the excellent photodegradation activity and reduce cost. It remains a huge challenge to design a kind of high performance, multifunctional and low cost photocatalysts driven by visible light for the remediation of pollutants from waste water. The carbon coated Tb 2 O 3 /Er 2 O 3 /TiO 2 nanotubes (Tb 2 O 3 /Er 2 O 3 /TiO 2 @C) 0D/1D hybrids were synthesized by a microwave hydrothermal method. The Er 2 O 3 nanoparticles can absorb low-energy photons at 800–980 nm and emit high-energy photons to TiO 2 through the up-conversion effect, meanwhile, the Tb 2 O 3 act as a redox center to promote the separation of photoinduction charges since the instantaneous photoelectric density was increased by 10 times by compared to TiO 2 @C. As a result, the photodegradation efficiency of the optimized Tb 2 O 3 /Er 2 O 3 /TiO 2 @C photocatalysts is about 15.7 times higher than that of TiO 2 @C under visible light irradiation for decomposing rhodamine B. Moreover, the photodegradation efficiency remained above 70 % after reused for 5 times. Thus, the enhanced synergistic effect between Er 2 O 3 and Tb 2 O 3 promises the excellent photodegradation activity and reduce cost.
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
ChemPlusChem
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2016
·Vol. 81
·期 11
·1166-1173
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IF 2.836
Xiaozhao Wang,Kui Cheng,Wenjian Weng,Huiming Wang,Jun Lin
Graphical Break away : Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. This incorporation inhibits charge recombination of the TiO 2 system under UV illumination, which increases the negative surface potential and changes the secondary structure of adsorbed extracellular protein molecules, and consequently results in a faster release of cells (see figure). Carbon quantum dots (CQDs) have been incorporated as a sensitizer into TiO 2 films to regulate the light-induced cell-detachment performance. Depending on the amount of CQDs incorporated, nanodots or porous films are obtained. It was found that the right amount of CQDs incorporation significantly improves the cell-sheet detachment efficiency, and an intact cell sheet could be obtained after merely five minutes of UV illumination (365 nm, UV365), which is much faster than that from CQDs-free TiO 2 film. Furthermore, cell sheets on CQDs-sensitized TiO 2 films show improved viability, and alkaline phosphatase and collagen I activity either before or after light-induced detachment. The improved cell-detachment performance is ascribed to the effective inhibition of charge recombination of the TiO 2 film and the microstructure variations, which increase the negative surface potential and change the secondary structure of the adsorbed extracellular protein molecules; this results in a faster release of cells. It is suggested that the faster release reduces the possible detrimental impact on cell functions during detachment and helps in maintaining the excellent cellular activity. This study demonstrates that CQDs sensitization is an effective approach for optimizing the performance of light-induced cell-sheet harvest.
研究领域:
材料科学
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生物材料
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细胞工程
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生物医学工程
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DOI
PubMed
高影响因子
International Journal of Nanomedicine
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2024
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IF 6.6
Zhenlei Wang,Zengci Run,Huamin Wang,Xiaojun He,Jian Li
Purpose The search for effective and low-risk treatment methods for colorectal cancer (CRC) is a pressing concern, given the inherent risks and adverse reactions associated with traditional therapies. Photothermal therapy (PTT) has emerged as a promising approach for cancer treatment, offering advantages such as non-radiation, non-invasiveness, and targeted treatment. Consequently, the development of nanoparticles with high stability, biocompatibility, and photothermal effects has become a significant research focus within the field of PTT.Methods In this study, TiO2-Ti3C2 nanocomposites were synthesized and characterized, and their photothermal conversion efficiency in the near-infrared region II (NIR-II) was determined. Then studied the in vivo and in vitro photothermal activity and anti-tumor effect of TiO2-Ti3C2 in human colorectal cancer cell lines and nude mice subcutaneous tumor model.Results The results showed that TiO2-Ti3C2 nanocomposites have strong absorption ability in the NIR-II, and have high photothermal conversion efficiency under 1064 nm (0.5 W/cm2, 6 min) laser stimulation. In addition, in vitro experiments showed that TiO2-Ti3C2 nanocomposites significantly inhibited the invasion, migration, and proliferation of colorectal cancer cells, and induced cell apoptosis; in vivo, experiments showed that TiO2-Ti3C2 nanocomposites-mediated PTT had good biocompatibility and efficient targeted inhibition of tumor growth.Conclusion In conclusion, TiO2-Ti3C2 nanocomposites can be used as NIR-II absorption materials in PTT to suppress the invasion, migration, and proliferation of colorectal cancer cells, induce colorectal cancer cell apoptosis, and thus inhibit the development of CRC. Therefore, TiO2-Ti3C2 nanocomposites can be used as potential anti-tumor drugs for photothermal ablation of colorectal cancer cells.
研究领域:
纳米技术
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癌症研究
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生物医学工程
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材料科学
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光热疗法
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产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 18
·4546
·
IF 3.1
Li Liu,Zhenghao Cui,Bo Feng,Mengjing Sui,Huaqin Huang,Zhaoyang Wu
In this study, novel Fe2O3/TiO2photocatalytic composites were synthesised by combining traditional oxidation roasting with the sol-gel method, using low-cost metallurgical waste (iron scales) as the raw material. The characterisation results revealed that the oxidised iron scales could be transformed into high-purity and porous Fe2O3particles through oxidation roasting, thereby providing additional sites for the adsorption process and thus serving as an effective carrier for TiO2-based photocatalytic materials. During the sol-gel process, TiO2was loaded onto the synthesised Fe2O3particles, generating core-shell heterostructure Fe2O3/TiO2photocatalytic composites. Under visible light irradiation for 90 min, the Fe2O3/TiO2photocatalytic composites achieved a remarkable methylene blue removal rate (97.71%). This reaction process followed the quasi-first-order kinetic model with a rate constant of 0.038 min−1. The results have demonstrated that this combination of various components in the Fe2O3/TiO2photocatalytic composites improved the adsorption, light utilisation, and charge separation effect of the photocatalysts. Moreover, the material exhibited favourable stability and recyclability, making it a decent candidate for the treatment of wastewater from the biochemical industry. Therefore, this study provides a new strategy for improving the photocatalytic activity of TiO2and expanding the high value-added utilisation of iron scales.
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
SOLID STATE SCIENCES
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2022
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IF 3.752
Xuejing Wang,Juan Xu,Sifan Liu,Wenwen Yang,Yanmei Chen,Yanhui Zhang
The research of metal organic frameworks materials of possessing semiconductor performance is important because they show great prospects on applications in wastewater treatment . In the current work, composites of TiO 2 / MOF-801(Zr) was prepared by a wet impregnation at room temperature , and a series of characterizations for catalysts, such as XRD , TEM , XPS, etc was investigated. The results of photocatalytic reduction of Cr(Ⅵ) under simulated solar light irradiation showed that 50%TiO 2 / MOF-801(Zr) exhibited better photocatalytic activity compared with other catalysts, which is attributed to synergistic effect including the interface enhancement effect and the enhancement of photogenerated carriers separation efficiency. The photocatalytic efficiency is as high as 98.1% when adjusting pH of reaction system to 1. It is most likely because the hydrogen cation concentration increased along with the increasing acidity, so that as to the promoting of reduction process of Cr(Ⅵ). In addition, we proposed a possible reaction mechanism of TiO 2 / MOF-801(Zr) composites for photocatalytic reduction of Cr(Ⅵ).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Cuicui Zhou,Shiqi Hong,Xinyu Chen,Quanfeng Li,Zongqi Chen,Songwang Yang
The electron transport layer (ETL) plays a critical role in efficient and stable perovskite solar cells (PSCs). The current effective method for the large-scale preparation of metal oxide ETLs is mainly based on expensive sputtering processes. Here, a screen-assisted self-spreading method is proposed as a novel approach to prepare uniformly thin and conformal TiO2 films on a rough fluorine-doped tin oxide (FTO) substrate as an ETL in planar PSCs. The TiO2 ETL deposited by this method exhibited good coverage and homogeneity on the rough FTO substrate, thereby minimizing interfacial recombination. The photovoltaic performance of the PSCs fabricated by this method is superior to that of the cells fabricated by spin coating, especially in terms of the fill factor. The performance enhancement can be attributed to the complete coverage of the FTO substrate by the conformal TiO2 film, confirming the effectiveness and reliability of the proposed method for the preparation of the TiO2 ETL. The advantages of this method lie in its scalability to prepare oxide films with a large area, eliminating the requirement of complex equipment, such as spinners, sputters, or physical vapor deposition equipment.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Hui Liu,Zongbao Zhang,Xiang Zhang,Yangyang Cai,Yang Zhou,Qiqi Qin,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Planar perovskite solar cells (PSCs) based on low-temperature processed gallium (Ga)-doped TiO 2 (Ga-TiO 2 ) films and CH 3 NH 3 PbI 3-x Cl x active layer have been fabricated by one-step method. The annealing temperature of Ga-TiO 2 electron-transport layer (ETL) is only 200 °C. The effect of Ga doping concentrations on the electric properties of Ga-TiO 2 ETL and PSCs has been systematically investigated. At the optimum Ga concentration, the PSCs based on Ga-TiO 2 and TiO 2 ETL achieve the champion power conversion efficiency (PCE) of 17.09% and 14.63%, and an average PCE of 16.51% and 14.15%, respectively. The higher PCE of PSCs based on Ga-TiO 2 ETL (Ga-PSCs) can be attributed to the reduced trap state density, enhanced conductivity, increased electron mobility and suppressed charge recombination, which will lead to higher V oc , J sc and FF, thus the improved PCE. Moreover, the Ga-PSC shows negligible hysteresis and improved stability compared to the reference TiO 2 -PSC. After being stored in air for 28 days, the PCE of unsealed Ga-PSCs can remain to be 86% of its initial value. This work provides an excellent strategy to fabricate efficient and stable PSCs by low-temperature process.
研究领域:
材料科学
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光伏技术
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纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Ze Luo,Qingxin Liang,Yuanshuai Qi,Guoqiang Huang
There is an urgent need for efficient and cost-effective adsorbents for the removal of trace hydrogen phosphide (PH 3 ) from the circular hydrogen systems in the polysilicon chemical vapor deposition furnaces. In this study, a straightforward and cost-effective method was used to synthesize a highly efficient adsorbent (Ce x -Cu y /TiO 2 ) for PH 3 removal using TiO 2 as the carrier and CuO as the active substance. Experimental findings demonstrated that optimal Ce doping amounts (n Cu :n Ce = 20:1) markedly enhanced the adsorbent's performance, with an adsorption capacity reaching as high as 149.14 mg g −1 . Material characterization results indicated that Ce positively influenced the uniform dispersion of Cu on the TiO 2 surface, and Ce doping increased the adsorbed oxygen content of the adsorbent, consequently enhancing its oxidation performance. The investigation of the reaction mechanism and causes of adsorbent deactivation revealed that the depletion of active substances (CuO) in the adsorbent and the accumulation of products such as Cu 3 P and phosphates are the primary factors contributing to its deactivation. Furthermore, high-temperature calcination could restore the activity of the adsorbent, indicating its great potential for engineering applications.
研究领域:
化学工程
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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
ENERGY & FUELS
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2024
·
IF 5.2
Huanjin Jiang,Jie Yang,Shangzhen Feng,Hantao Zhou,Jixiang Chen
Ni3Sn2/TiO2, Ni3Sn2/TiO2–ZrO2(x:y) (x:y indicates the Ti/Zr atomic ratio), and Ni3Sn2/ZrO2 catalysts were prepared by the sol–gel method and tested for in situ hydrodeoxygenation of methyl palmitate with methanol as the hydrogen donor. The Ni3Sn2 intermetallic compound (IMC) is formed in all of the catalysts. The Ti–O–Zr bonds are generated in the TiO2–ZrO2 mixed oxide, leading to more Lewis acid sites on Ni3Sn2/TiO2–ZrO2(x:y) than those on Ni3Sn2/TiO2 and Ni3Sn2/ZrO2, and Lewis acid sites may contribute to the C–O bond cleavage. Especially, among the as-prepared catalysts, Ni3Sn2/TiO2–ZrO2(2:1) has the largest specific surface area and the smallest Ni3Sn2 particles, subsequently giving rise to the highest activity for in situ hydrodeoxygenation. The decarbonylation pathway dominates on all of the supported Ni3Sn2 IMC catalysts. At 330 °C, the yield of n-pentadecane on Ni3Sn2/TiO2–ZrO2(2:1) reaches 91.2%. Ni3Sn2/TiO2–ZrO2(2:1) shows slight deactivation after reaction for five times, mainly due to carbon deposition and the slight sintering of Ni3Sn2 IMC particles.
研究领域:
催化化学
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shouwu Xu,Zhilong Zhang,Hailin Zhang,Zhiwei Li,Haoping Peng,Sibudjing Kawi,Aijun Xie,Ping Qiu
The development of a photoelectrochemical cathodic protection film with electron storage capabilities offers a feasible method for metal protection in the absence of light. In this study, we designed and fabricated an innovative TiO 2 /ZIF-67 composite film in situ. The synthesized ZIF-67 nanoparticles with a dodecahedral structure not only facilitate contact with the electrolyte but also significantly broaden the sunlight absorption range. When coupled with 304 SS, the TiO 2 /ZIF-67-20 composite film demonstrated a minimum OCP value of −0.675 V (vs. SCE) under illumination. Notably, even after 10 h of light deprivation, the OCP remained lower than that of 304 SS. This sustained protection can be attributed to the electronic storage and release capabilities of the Co element within the TiO 2 /ZIF-67 composite, ensuring continuous cathodic protection for 304 SS during both illuminated and dark conditions. This study contributes valuable insights into achieving all-weather cathodic protection for 304 SS.
研究领域:
材料科学
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腐蚀与防护
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jianwen Lai,Hongbo Qi,Yunfeng Ma,Xiaoqing Lin,Xiaoying Wang,Zhongkang Han,Heidelore Fiedler,Xiaodong Li
Cerium is widely used as a modifier to enhance the catalytic performance of the selective catalytic reduction (SCR) catalysts due to its exceptional low-temperature properties. However, the effects of different cerium precursors on catalytic performance remains unclear. In this study, VO x -WO x /TiO 2 catalysts are modified using Ce(NO 3 ) 3 ·6H 2 O (cata-N), CeO 2 (cata-O), and Ce(OH) 4 (cata-OH), and their synergistic removal of NO x and chlorobenzene (CB), as well as their resistance to water and sulfur poisoning, were systematically investigated. Among the tested catalysts, cata-N demonstrated superior CB (45.0–93.3 %) and NO x (31.9–90.37 %) removal efficiencies under synergistic conditions, along with excellent water resistance (T 90 = 193 °C with 5 % H 2 O). In contrast, cata-OH exhibited the highest sulfur resistance, maintaining a denitrification efficiency of 20 % after 10 h of sulfur exposure, compared to 9 % for cata-N and 8 % for cata-O. Characterization revealed that Ce(NO 3 ) 3 ·6H 2 O improved cerium dispersion, leading to enhanced the redox properties and acidity (especially Brønsted acid sites (BAS)) in cata-N. Density functional theory (DFT) calculations and In-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy ( In-situ DRIFTS) results revealed that the well-dispersed cerium atoms contributed additional BAS in the form of Ce–OH, while also forming Ti–O–Ce bonds. These Ti–O–Ce bonds facilitated the formation of Ti–OH on the TiO 2 surface. Ti–OH significantly enhanced the adsorption of NH 3 and CB, thereby promoting both the NH 3 -SCR and CB oxidation processes. This study offers new insights into the role of cerium precursors and provides a practical strategy for tuning BAS of catalysts in multiple pollutants removal.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2014
·
IF 1.922
Qingkong Chen,Fangying Ji,Qian Guo,Jianping Fan,Xuan Xu
A novel coupled system using Co–TiO 2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction (SR-Fenton) and visible light photocatalysis (Vis-Photo), for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B (RhB) degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the TiO 2 lattice is the reason for the visible light photocatalytic activity of Co–TiO 2 . Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability, and almost no dissolution of Co 2 + was found.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）