RSC Advances
·
2024
·Vol. 14
·期 12
·8100-8107
·
IF 3.9
Yu Hua,Xiaomeng Zhang,Fulin Chen,Yuantao Sun,Xinyu Wang,Ziliang Wen,Qinghao Tan,Chenxi Sun,Buhe Bateer
In this study, we utilized a simple calcination method to prepare a Ni/TiO2/C composite, which was synchronously grown from magnetic, semiconductor, and conductive materials. XRD, SEM, Raman, and XPS characterization methods were used to analyze the crystal structure, graphitization degree, morphology size, and valence state of Ni/TiO2/C, and its electromagnetic wave absorption performance was tested. It was revealed that rod-like Ni/TiO2/C had good electromagnetic wave absorption performance at a thickness of 1–5.5 mm; in particular, its reflectance reached −40 dB at 3.5 mm and its absorption bandwidth (reflectivity < −10 dB) reached 4.4 GHz (6.0–10.4 GHz) at a thickness of 4.0 mm. It was thus revealed that its electromagnetic wave absorption rate and absorption bandwidth can be regulated by its thickness. Compared with Ni/TiO2, it was proven that the conductive materials (carbon), magnetic materials (Ni), and semiconductor materials (TiO2) in the rod-like Ni/TiO2/C composite can synergistically absorb electromagnetic wave energy through dielectric and magnetic losses.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Prosper Kwame Klu,Hao Zhang,Muhammad Abdul Nasir Khan,Chaohai Wang,Junwen Qi,Xiuyun Sun,Jiansheng Li
Developing new catalysts for efficient degradation of micropollutants in water is of significant importance in advanced oxidation processes (AOPs). Herein, TiO 2 /C coated Co 3 O 4 nanocages (Co 3 O 4 @TiO 2 /C) were synthesized and their performance on micropollutants degradation was evaluated. Specifically, cobalt-based Zeolitic imidazolate framework (ZIF-67) coated by a thin layer of titanium species and polydopamine (PDA) was used as a precursor for the preparation of Co 3 O 4 @TiO 2 /C by two-step calcination. The catalytic performance of peroxymonosulfate (PMS) activation towards the degradation of organic pollutants was investigated by using atrazine (ATZ) and Bisphenol A (BPA) as typical micropollutants. The efficiency and the effect of TiO 2 /C shell on the as-synthesized catalyst were analyzed by comparing Co 3 O 4 derived from ZIF-67 and Co 3 O 4 /C derived from ZIF-67/PDA. ATZ degradation results showed that the Co 3 O 4 @TiO 2 /C catalyst was the most efficient for catalytic oxidation when 99.5% of ATZ was removed within 4 min, which is 57.5% and 74.6% faster than that of Co 3 O 4 @C and Co 3 O 4 , respectively. The enhanced performance of Co 3 O 4 @TiO 2 /C is attributed to their unique nanocages structure and improved specific surface area. The catalysis mechanisms and ATZ degradation pathways were presented based on the results of electron paramagnetic resonance (EPR), XPS, and LC-MS analysis. Our results might have added to the design of heterogeneous catalysts of large surface area for efficient PMS activation in AOPs.
研究领域:
环境科学
·
催化材料
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74774-74782
·
IF 3.84
Wenjun Zhu,Hui Yang,Wenkui Zhang,Hui Huang,Xinyong Tao,Yang Xia,Yongping Gan,Xingzhong Guo
A Li4Ti5O12/TiO2/carbon (Li4Ti5O12/TiO2/C) nanocrystalline composite has been successfully synthesized by a facile sol–gel method and subsequent calcination treatment. Moreover, pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites have also been synthesized for comparison. All the samples present a nanocrystalline structure with a uniform size distribution, and abundant phase interfaces can be detected for the Li4Ti5O12/TiO2 and Li4Ti5O12/TiO2/C composites. Electrochemical measurements demonstrate that the resultant Li4Ti5O12/TiO2/C composite exhibits a superior rate capability and cycle stability in comparison with pure Li4Ti5O12, Li4Ti5O12/C and Li4Ti5O12/TiO2 composites, which can be attributed to a high grain boundary density, abundant phase interfaces and in situ formed carbon, for storing extra lithium ions, enhancing rapid lithium insertion/extraction kinetics and improving the electron transport rate.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Tao Ke,Shuyi Shen,Kun Yang,Daohui Lin
Developing visible-light-driven photocatalysts with high charge separation and transfer efficiency to degrade organic pollutants in wastewater remains a major issue. In this work, quaternary Bi 2 O 3 /C 3 N 4 /TiO 2 @C (BCTC) hybrids were successfully fabricated by hydrothermal and calcination two-step method using Bi(NO 3 ) 3 ·5H 2 O, C 3 N 4 , and Ti 3 C 2 as precursors. The optimized BCTC hybrids with the dosage of 1 g L −1 (BCTC-2%) exhibited high photocatalytic activity, degrading 100% sulfamethoxazole (SMZ, 5 mg L −1 ) within 100 min under visible light irradiation. Moreover, the photocatalytic degradation rate of SMZ by the quaternary junction was found to be 5.12-, 2.87-, and 1.35-fold higher as compared with Bi 2 O 3 /C 3 N 4 , C 3 N 4 /TiO 2 @C, and Bi 2 O 3 /TiO 2 @C junctions, respectively. The enhanced photocatalytic performance of BCTC hybrids could be attributed to the formation of a double Z-scheme photocatalytic system and the photosensitization of Bi 2 O 3 and C 3 N 4 . The photogenerated hole (h + ) was the primary reactive species that degraded SMZ. The plausible intermediates during the photocatalytic degradation of SMZ were identified by high-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry and the degradation pathway was postulated. Importantly, BCTC-2% had a good photocatalytic activity for degrading SMZ in natural water samples, indicating the high potential of BCTC hybrids for wastewater treatment applications.
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
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Baolin Yan,Juan Zhou,Xiaoyu Liang,Kainan Song,Xintai Su
The production of H 2 by photocatalytic water splitting has become a promising approach for clean, economical, and renewable evolution of H 2 by using solar energy. In spite of tremendous efforts, the present challenge for materials scientists is to build a highly active photocatalytic system with high efficiency and low cost. Here we report a facile method for the preparation of TiO 2 /C nano-flakes, which was used as an efficient visible-light photocatalyst for H 2 evolution. This composite material was prepared by using a phase-transfer strategy combined with salt-template calcination treatment. The results showed that anatase TiO 2 nanoparticles with the diameter of ∼10 nm were uniformly dispersed on the carbon nano-flakes. In addition, the samples prepared at 600 °C (denoted as T600) endowed a larger surface area of 196 m 2 g −1 and higher light absorption, resulting in enhanced photocatalytic activity. Further, the T600 product reached a high H 2 production rate of 57.2 μmol h −1 under visible-light irradiation. This unusual photocatalytic activity arose from the positive synergetic effect between the TiO 2 and carbon in this hybrid catalyst. This work highlights the potential of TiO 2 /C nano-flakes in the field of photocatalytic H 2 evolution under visible-light irradiation.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2015
·
IF 3.313
Hansheng Wan,Qizhi Dong,Guiming Zhu,Gang Yu,Tianwu Yin,Meiling Huang
In this work, anatase-TiO 2 is investigated as a catalyst support in Pd/TiO 2 –C composite to improve the electrocatalytic properties of Pd for formic acid oxidation reaction (FAOR). Pd/TiO 2 has been synthesized by an impregnation-reduction method and then mixed with Vulcan XC-72R carbon black to obtain Pd/TiO 2 –C composite. Transmission electron microscopy (TEM) images show Pd nanoparticles (ca.3.5 nm in average diameter) in the Pd/TiO 2 –C (1:1) composite catalyst were dispersed on the surface of TiO 2 with a narrow particle size distribution . Electrochemical tests demonstrate Pd/TiO 2 –C (1:1) composite has significantly increased catalytic activity and stability compared with Pd/C for FAOR. The proposed reasons for these observations are the excellent acid corrosion and oxidation resistance of TiO 2 and the synergistic effect of Pd and TiO 2 nanoparticles . The effect of mass ratios of TiO 2 to C on the catalytic performance is also discussed. The best catalytic activity and stability for FAOR is found when the mass ratio of TiO 2 to C is 1:1. It can be interpreted as the synergistic effects and conductivity reach balance at this point.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Azim Khan,Ruhumuriza Jonathan,Shafiq Ur Rehman,Muhammad Shoaib,Feng Cao,Sajjad Ali,Mohamed Bououdina,Pir Muhammad Ismail,Junwei Wang,Hazem Abu-Farsakh,Yifan Liu,Xian Jian
Enhancement in the visible light absorption and efficient interfacial charge transfer is crucial for optimizing photocatalytic efficiency in the degradation of pollutants such as methyl orange (MO) and formaldehyde. This study focuses on the properties of a TiO 2 /C/g-C 3 N 4 hybrid efficient photocatalyst, which is developed using an air calcination method to deposit graphitic nitride (g-C 3 N 4 ) onto a carbon-modified TiO 2 surface. The characterization techniques, including high-resolution transmission electron Microscopy (HRTEM), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were used to provide a comprehensive understanding of the material’s structural, morphological, thermal, and chemical properties. This hybrid catalyst is specifically engineered for the efficient decomposition of methyl orange (MO) and formaldehyde, demonstrating a significant increase in photocatalytic activity. The TiO 2 /C/g-C 3 N 4 photocatalyst also exhibits an enhanced specific surface area of 181.2 m 2 /g, which facilitates increased physical adsorption and photo-catalytic active sites. Experimental results confirm that this catalyst effectively adsorbs MO physically even in the dark without degradation. Combining physical and photo-catalytic functions, this catalyst degrades 94 % of MO within 180 min with the initial concentration 0.2 mol/L of MO, and achieves almost 100 % decolorization of MO under visible light irradiation. Notably, the catalyst retains its high activity after 4 cycles of MO degradation, underscoring its durability and consistent performance. Additionally, the hybrid catalyst features a staggered type-II energy level configuration, which effectively enhances charge separation and boosts photocatalytic efficacy. The incorporation of an ultrafine carbon layer further augments electron mobility towards the surface, crucial for effective catalytic reactions. This study paves the way for future development of highly efficient photocatalytic materials for environmental purification.
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
MATERIALS RESEARCH BULLETIN
·
2024
·
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
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Qian Zhong,Jin Liu,Junting Wang,Yuan Li,Jun Li,Gaoke Zhang
To activate peroxymonosulfate (PMS) is an efficient way for decomposition of non-biodegradable organic pollutants. Herein, Mg–Fe layered double oxides decorated with Ti 3 C 2 MXene-derived TiO 2 @C (T/LDOs) were fabricated to efficiently activate PMS for the degradation of Rhodamine B (RhB), acid red 1 (AR1), methylene blue (MB), and tetracycline hydrochloride (TC). The T/LDOs catalyst could decompose 95.8% of RhB, 94.8% of AR1, 84.9% of MB within 10 min, and 82.4% of TC within 60 min. The degradation rate constant of RhB in the optimal T/LDOs/PMS system was approximately 2.5 and 15.7 times higher than that in the Mg–Fe LDOs/PMS system and Mg–Fe LDH/PMS system, respectively. Importantly, the T/LDOs exhibited a wide working pH range (3.1–11.0) and high stability with low metal ions leaching, indicating its potential practical applications. Quenching experiments and electronic spin resonance results confirmed that both • O 2 − and 1 O 2 were the dominant active species in the T/LDOs/PMS system. In addition, the possible degradation pathway of RhB in the 5%-T/LDOs/PMS system was proposed. Finally, the catalytic mechanism study revealed that the T/LDOs with abundant surface hydroxyl groups and a certain amount of TiO 2 @C facilitated the electron transfer between ≡Fe (Ⅲ) ‒OH complex and HSO 5 − , boosting the generation of • O 2 − and 1 O 2 . This study provides an insight into exploiting highly efficient catalysts for PMS activation towards the degradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Nanotechnology Reviews
·
2023
·Vol. 12
·期 1
·
IF 7.4
Ruhumuriza Jonathan,Shafiq Ur Rehman,Feng Cao,Hui Xu,Xuejuan Ma,Junwei Wang,Yifan Liu,Yinghua Niu,Xian Jian,Nasir Mahmood
Developing high-efficiency and low-cost visible light photocatalyst is a great challenge for degrading both air and liquid pollutants. Herein, we developed a large-scale preparation of ultrafine TiO 2 @C hybrid visible light photocatalyst for high-performance degradation of formaldehyde and methyl orange (MO) at low cost using the ultra-low temperature (<200°C) air calcination method. The as-designed TiO 2 @C hybrids are at the scale range of 2–5 nm and modified by ultrafine carbon layers enabling the strong physical adsorption and narrowing the corresponding band gap. Specifically, the photocatalytic performance of TiO 2 @C hybrids for formaldehyde and MO degradation was investigated both in the air and liquid pollutant. After optimization, the TiO 2 @C hybrid obtained at 175°C possesses relatively better photocatalytic degradation performance than other parallel control composites under visible light irradiation. The enhanced photodegradation ability of TiO 2 @C-175°C hybrid with visible light response attributes to novel hybrid structure with rich defect active sites and narrow band gap (2.51 eV), favoring dual functions of physical adsorption and chemical degradation. This ultra-low temperature air calcination approach can open a low-cost and scalable pathway to design TiO 2 @C hybrids for green environment.
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
THIN SOLID FILMS
·
2020
·
IF 2.03
Lixin Song,Piaopiao Chen,Zhaowu Li,Pingfan Du,Yefeng Yang,Ni Li,Jie Xiong
Flexible counter electrode (CE) is a key to develop flexible dye-sensitized solar cells (DSSCs). To obtain flexible CE with well electro-catalytic activity, the carbon nanotubes (CNTs) were employed to modify the flexible TiO 2 /C nanofibrous film. All the CNTs/TiO 2 /C nanofibrous film with incorporation of CNTs into TiO 2 /C nanofiber showed pleasurable flexibility. In addition, the specific surface area, the conductivity, and the electro-catalytic activity of the nanofibrous film increased as the content of CNTs increased, reaching the largest values before decreasing. The CNTs/TiO 2 /C nanofibrous film with 2% of CNTs incorporation possessed optimal electro-catalytic activity. Therefore, the conversion efficiency of the flexible quasi-solid DSSCs based on the nanofibrous film CE was greatly enhanced and the highest conversion efficiency of about 3.4% was achieved. Besides, the properties of the CNTs/TiO 2 /C nanofibrous film almost remained constant after 50 cycles with the bending radius of 1 mm and the twisting angle of 10π, implying that it exhibited excellent bending stability and twisting stability. The flexible CNTs/TiO 2 /C nanofibrous film has a huge potential in flexible devices.
研究领域:
材料科学
·
纳米科技
·
能源材料
·
光电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 13
·6635-6643
·
IF 7.79
Die Su,Jing Dai,Min Yang,Jiaxing Wen,Jianping Yang,Wen Liu,Hai Hu,Li Liu,Yan Feng
TiO2-red phosphorus/C nanofibers (TiO2-RP/CN) have been synthesized via electrospinning and then annealed with red phosphorus sublimation. Benefiting from the high electronic/ionic conductivity and robust stability of the unique structure, the TiO2-RP/CN show high reversible capacities, as well as an outstanding cycling ability. In K half cells, the capacity decay of the TiO2-RP/CN electrode mainly occurs in the first few cycles, and at 0.05 A g−1 it delivers a high specific capacity of 257.8 mA h g−1 after 500 cycles. K full cells were fabricated; these are well-matched with PTCDA (perylene-3,4,9,10-tetracarboxylic dianhydride) and also exhibited a good electrochemical performance (62 mA h g−1 after 100 cycles). Therefore, the TiO2-RP/CN are potential anode materials for use in K-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）