RADIATION PHYSICS AND CHEMISTRY
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2019
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IF 1.984
Xueting Xie,Liqin Li,Shengying Ye,Quan Zhang,Xuemei Chen,Xun Huang
A nanocomposite photocatalyst of TiO 2 nanotubes/reduced graphene oxide (rGO-TNTAs) were prepared by γ-ray radiolysis . The rGO-TNTAs were studied for photocatalytic decomposition of ethylene (C 2 H 4 ) in a refrigerated environment. Degradation efficiency of ethylene by these materials was described by the apparent first-order rate constant ( K ). The composite was characterized by Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), Atomic force microscopy (AFM) and Field emission electron microscopy (FESEM). The preparing parameters for materials affecting the degradation efficiency in terms of the rate constant were studied, including the GO addition and the irradiation dose. The results showed that (1) gamma irradiation can induce GO to partial rGO, the rGO surface of rGO-TNTAs was smooth and loosely lamellar structure. (2) The K of the rGO-TNTAs is highly dependent on the GO addition and the irradiation dose. With a GO addition of 0.1 g and an irradiation dose of 20 kGy, the maximum K value of rGO-TNTAs could be obtained under the experimental conditions. (3) From analysis of the Raman spectroscopy spectrum, optimum changes had occurred in the intensity ratio of D-band to G-band of the GO that had been γ-ray-irradiated with a dose of 20 kGy, resulting in the K of rGO-TNTAs increased by 40.9% compared with that of TNTAs.
研究领域:
材料科学
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环境科学
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辐射技术
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2018
·Vol. 86
·期 3
·699-710
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IF 1.745
Guo Jiuli,Han Qiuwan,Zhong Siyuan,Zhu Baolin,Huang Weiping,Zhang Shoumin
The M-modified TiO 2 nanotubes (NTs) (M = Ce, Ga, Co, Y, 2.0 wt%) were synthesized by combining sol-gel method with hydrothermal treatment, based on which gold was loaded by the deposition–precipitation approach. These catalysts were loaded with 1.5 wt% gold and calcined at 300 °C, and their catalytic performance was compared with Au/TiO 2 NTs in CO oxidation. TEM results manifested Au/M-TiO 2 NTs (M = Ce, Ga, Co, Y) had smaller gold nanoparticles than Au/TiO 2 NTs. Patterns of XPS revealed the presence of the strong interaction between gold and support in Au/M-TiO 2 NTs (M = Ce, Ga, Co, Y). Ce 4+ , Ga 3+ , Co 2+ , and Y 3+ ions were present as CeO 2 , Ga 2 O 3 , CoO, and Y 2 O 3 in Au/M-TiO 2 NTs (M = Ce, Ga, Co, Y), respectively. Based on O 2 -TPD studies, Au/M-TiO 2 NTs (M = Ce, Ga, Co, Y) provided new O 2 adsorption sites for the adsorption and activation of oxygen in CO oxidation. M (M = Ce, Ga, Co, Y) modifying performed the positive effect on CO oxidation activity and Au/Y-TiO 2 NTs showed the highest activity among these catalysts. Additionally, Au/Y-TiO 2 NTs also performed excellent high-temperature stability. It was likely that the strong interaction between gold and support created the small size of gold nanoparticles, large O 2 adsorption and plenty of defects, thereby enhancing the catalytic activity of Au/M-TiO 2 NTs (M = Ce, Ga, Co, Y).
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
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IF 4.504
Yajun Zhang,Guohua Zhao,Huijie Shi,Ya-nan Zhang,Wenna Huang,Xiaofeng Huang,Zhongyi Wu
The development of highly efficient and low-cost approaches for catalytic hydrogen production from renewable energy is of tremendous importance for a truly sustainable hydrogen-based energy carrier in future life. Herein, the probability of utilizing solar light to product hydrogen from biomass derivative, glucose, was systematically demonstrated by using the periodically ordered TiO 2 nanotube arrays (TNTAs) assembled of Palladium quantum dots (Pd QDs), i.e. Pd QDs@ TNTAs as photoanode. The results showed that remarkably increased photocurrent density was obtained in the glucose solution compared to the pure KOH electrolyte over as-prepared photoelectrode, which indicated that the glucose could be faster oxidized than water oxidation, and thus could promote the hydrogen production on Pt cathode. The yield of hydrogen production from glucose oxidation reached as high as 164.8 μmol cm −1 over Pd QDs@TNTAs photoanode and Pt cathode system (denoted as Pd QDs@TNTAs/Pt) under the solar light irradiation for 6 h, which was about 15 times higher than that from pure water splitting. The superior hydrogen production performance could be attributed to the less endergonic process of the glucose oxidation than water, as well as the efficient synergistic photoelectrocatalytic (PEC) glucose oxidation over Pd QDs@TNTAs photoanode which possesses excellent photoelectrochemical performance and structure characteristics. Moreover, a probable mechanism for the PEC hydrogen production from biomass derivatives oxidation was proposed and discussed.
研究领域:
材料科学
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能源科学
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催化化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2016
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IF 2.758
Zhang Lan,Wanxia Wu,Sheng Zhang,Lanfang Que,Jihuai Wu
Highly ordered TiO 2 nanotube arrays are synthesized and utilized in preparing front-side illuminated photoelectrodes of CdS quantum-dot-sensitized solar cells (QDSSCs). The CdS quantum dots (QDs) are adsorbed on the ordered TiO 2 nanotube arrays by successive ionic layer adsorption and reaction method (SILAR). Taking the advantages of high surface area and large size of ordered pores of the TiO 2 nanotube arrays, the reaction solutions for SILAR processes can easily penetrate into the photoelectrodes; and the formed CdS QDs can be homogeneously dispersed on the TiO 2 nanotube walls with high coverage. In order to improve photovoltaic performance of QDSSCs, the other important components including counterelectrode, polysulfide (S 2− / S x 2 - ) electrolyte, and cycles of SILAR processes for preparing CdS QDs sensitized photoelectrodes are optimized. With thermally treated CuS counterelectrode, pure deionized water based polysulfide (S 2 − / S x 2 - ) electrolyte, and 15 cycles of SILAR processes prepared CdS QDs sensitized photoelectrode, the QDSSC can achieve the highest power conversion efficiency about 3.22% under full sunlight illumination (100 mW cm −2 , AM 1.5G), which is a comparative value among the pure CdS QDs sensitized solar cells.
研究领域:
材料科学
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纳米技术
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能源研究
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Dandan Liu,Haiou Liang,Chunping Li,Jie Bai
Photocatalytic water splitting is a prospective strategy to solve the shortage of human fossil fuel energy. In this work, we designed and synthesized the Pt as co-catalyst decorated on TiO 2 nanotubes/metastable zinc-blende (ZB) CdS nanoparticles (NPs) with highly exposed (1 1 1) facets (HPTCA3) via the electrospinning-solvothermal and chemical deposition methods. The H 2 evolution rate of HPTCA3 was 15025.38 μmol·g −1 ·h −1 , which was about 111.3 and 2.4 times stronger than that of pure CdS power and Pt-TiO 2 /CdS hollow nanotubes (HPTC). The XRD patterns showed the presence of acetate promoted the growth of ZB CdS (1 1 1) crystal facets, and the photogenerated electrons were easily tended to accumulate on the CdS (1 1 1) facets, whichwas conducive to the transmission of electrons on the CdS and TiO 2 interface. The type II heterojunction can broaden the visible light response range and accelerate the separation and transfer of photo-generated electrons and holes which can be supported by the Optical and Electrochemical characterizations. Band structure calculations and XPS spectrum indicated that the composite catalyst had an efficient electron transfer mechanism, which was beneficial for the spatial separation of photogenerated carriers. The work provides a rational photocatalyst design to improve the performance of photocatalytic splitting of water into hydrogen.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Weichen Zeng,Han Zhang,Rui Wu,Luming Liu,Guibai Li,Heng Liang
This study focused on the preparation, characterization, and sulfamethoxazole (SMX) removal performance of the SnO 2 -coated reactive electrochemical membrane (REM). This REM was fabricated by loading SnO 2 on the reduced TiO 2 nanotube arrays (RTNA)-based Ti membrane (TM). Regarding the dopant for SnO 2 , Sb was more effective in boosting the electrocatalytic activity than Bi, and the energy consumption for Sb-SnO 2 -coated REM (TM/RTNA/ATO) was lower than Bi-SnO 2 -coated REM (TM/RTNA/BTO). As for the internal layer, RTNA provided TM/RTNA/ATO with more electroactive surface areas and prolonged the service lifetime. Compared with batch mode, the SMX removal efficiency in flow-through mode was increased up to 8.4-fold. The SMX degradation performances were also affected by fluid velocity, current density, initial SMX concentration, and electrolyte concentration. The synergistic effects of • OH oxidation and direct electron transfer were responsible for the effective removal of SMX. TM/RTNA/ATO was proved to be stable and durable by multi-cycle and accelerated lifetime tests. Its extensive applicability was verified with high removal efficiencies of SMX in the surface water and wastewater effluent. These results demonstrate the promise of TM/RTNA/ATO for water treatment applications.
研究领域:
环境科学
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电化学工程
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水处理技术
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产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2023
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IF 7.3
R. Lu,S.-Z. Zhao,Y. Yang,Y. Wang,H.-L. Huang,Y.-D. Hu,R.D. Rodriguez,J.-J. Chen
TiO 2 nanotubes decorated with Bi 2 O 3 /Bi 2 O 2.33 nanosheets were prepared through a facile avenue that combines sacrifice template and hydrothermal methods . The TiO 2 nanotube structure provided a large specific surface area, and the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterojunction broadened the light absorption range by reducing the bandgap to 2.746 eV. The TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure demonstrated high adsorption capability for methyl orange (100 mg/L) with a 70% adsorption rate after 60 min. The photocatalytic performance of the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure was evaluated through the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH). The removal rates of RhB (10 mg/L) and high concentration TCH (50 mg/L) could reach 93% and 96% after 60 min and 120 min of light irradiation, respectively. Theoretical calculations showed that the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) structure enhanced photogenerated charge separation, leading to improved degradation of organic pollutants. This study provides a facile way for designing and creating heterostructural nanotubes with enhanced performance for removing organic pollutants.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Wei Han,Xin Ge,Jili Yuan,Ronglan Pan,Yao Yang,Guanglong Zou,Haibo Xie
Nitrate (NO 3 − ) Electroreduction to produce NH 3 offers an alternative approach to sustainable production of NH 3 . Yet it remains challenging to simultaneously improve the adsorption and enrichment of low-concentration NO 3 − . Here, bundles of CuO x microneedles on TiO 2 nanotubes (NTs) were developed by a spatial-confined electrodeposition strategy, achieving 87.7 % or 98.4 % NH 3 FE at −0.25 V or −0.45 V vs RHE in 2 or 10 mM NO 3 − electrolytes, respectively. Both in-situ spectroscopy and finite element analysis simulation demonstrated that CuO x microneedle bundles and its interface between TiO 2 NTs not only greatly improve the enrichment of low concentration NO 3 − and its derived-NO 2 − and the diffusion of NH 3 product, but also enhance the adsorption of NO 2 − and H 2 O to facilitate the hydrodeoxygenation of NO 3 − as well as inhibit hydrogen evolution reaction competition. This work will provide a promising avenue to develop electrocatalysts to realize efficient catalytic conversion of reactants at low concentrations.
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
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2021
·Vol. 151
·期 10
·3067-3078
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IF 3.186
Zhu Ying,Yang Jiandong,Bian Chang,Yang Wenshu,Meng Xianwei,Liu Zhiyan,Li Ying,Zhao Yingying,Fu Wuyou,Yang Haibin
Abstract A new strategy to enhance the photocatalytic properties of graphitic carbon nitride is reported via constructing an effective NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film (Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 /NiO). This thin film photocatalyst can separate hydrogen gas and oxygen gas into different sides of the Ti substrate. Owing to the synergistic effect of the NiO as co-catalyst and the formation of Step-scheme (S-scheme) heterojunction between g-C 3 N 4 and TiO 2 , the electrons and holes were successfully separated to their opposing active centers, which is beneficial to inhibiting the recombination of the charge carriers. The gas evolution rate of Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 /NiO is 7.97 μmol h −1 cm −2 under the irradiation of high-pressure mercury lamp, which was 3 and 1.3 times as high as that of the Ti/TiO 2 NT/g-C 3 N 4 and Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 , respectively. Firstly, benefiting from the well-matched band structure, a direct S-scheme Ti/TiO 2 NT/g-C 3 N 4 heterojunction thin film is constructed easily driven by the built-in electric field across the Ti/TiO 2 NT/g-C 3 N 4 interface. Furthermore, the introduction of the TiO 2 layer on the TiO 2 NT will broaden light absorption range and increase the heterojunction area, which in turn conduces to effective charge separation. In addition, NiO as a co-catalyst cannot only accelerate the charge separation but also provide plentiful catalytic sites and decompose H 2 O 2 produced by g-C 3 N 4 . The thin film photocatalysts can be recycled again, which is different from traditional powdered photocatalysts. This work constructs a NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film, and provides a new insight to promote photocatalytic activity of g-C 3 N 4 under the synergetic impact of S-scheme heterostructure and NiO co-catalyst. Graphic Abstract
A novel NiO decorated Ti/TiO 2 NT/TiO 2 /g-C 3 N 4 S-scheme heterostructure photocatalyst thin film was fabricated to enhance photocatalytic activity for water splitting.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Junling Qin,Zhiguang Cao,Hui Li,Zixue Su
TiO 2 nanotubes prepared by anodization of titanium metal substrates are widely used as functional materials in various fields. Small pore size TiO 2 nanotube arrays are demanded because of their excellent performance in applications. However, the minimum pore size of TiO 2 nanotube arrays has been limited to ~15 nm (nm) despite of long time extensive studies. In the present work, we have fabricated TiO 2 nanotube arrays with diameter down to an unprecedented low value of ~6 nm in ammonium fluoride-containing ethylene glycol electrolyte by a simple one-step anodic oxidation method under optimized condition. The influences of concentration of ammonium fluoride, viscosity of solution, amount of adding water and applied voltage on the anodic growth of small pore TiO 2 nanotubes are studied systematically. Pore initiation and widening determined by the competition between chemical dissolution and field driven growth of anodic oxides under relative low formation field strength are investigated, where local concentration of fluoride anions and acidity near pore bottom are believed to play significant roles in the formation of nanoporous or nanotubular TiO 2 with ultra-small pore diameter and cell size. By sealing the reaction cell to prevent the solution from absorbing ambient water, typical TiO 2 nanotube arrays with a pore diameter of ~10.8 nm can grow up to ~1.1 μm in length, i.e. an aspect ratio up to 100, which is remarkable for TiO 2 nanotubes with such small pore size.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Sheng Wang,Zhenzhen Jiang,Shenshen Ouyang,Zhipeng Dai,Tao Wang
We describe a highly effective bubble-propelled nanomotor for the photocatalytic decomposition of organic pollutants in water. Two different tubular TiO2 nanomotor systems are presented: one with Pt nanoparticles decorated on the inner surface and the other with Pt nanoparticles decorated on the outer surface. This is the first time that we have observed the autonomous movement of a tubular nanomotor without the aid of any surfactant, as well as a tubular nanomotor externally decorated with Pt propelled by oxygen bubbles. The synergy between the Pt nanoparticles and the superhydrophilic wetting behavior of the TiO2 nanotubes endows the two nanomotor systems with high speed at very low H2O2 fuel concentrations without the addition of any surfactant. The efficient photodecomposition of rhodamine B demonstrates the intermixing and photocatalytic ability of the two nanomotor systems, which opens new avenues for the development of multifunctional bubble-propelled micro/nanomotors with myriad practical applications.
研究领域:
环境科学
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纳米技术
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材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jibo Liu,Huijie Shi,Qi Shen,Chenyan Guo,Guohua Zhao
Aiming at improving the efficiency of photoelectrocatalytic (PEC) CO 2 conversion to methanol, a heterogeneous photoelectrocatalyst was prepared by covalently binding a Ru(II) metal-organic complex (Ru-Py) containing exposed pyridyl on the periodic TiO 2 nanotube arrays (TNTAs). PEC characterization indicated that the Ru-Py/TNTAs photocathode exhibited excellent PEC CO 2 reduction activity in aqueous solution. The initial CO 2 reduction potential on Ru-Py/TNTAs photocathode reached −0.4 V (vs. NHE) under simulated solar irradiation. The cathodic photocurrent response of Ru-Py/TNTAs in CO 2 -satuarated aqueous solution was about 1.79 mAcm −2 , which was 2.4 times that of TNTAs . It may be caused by the enhanced light absorption in the visible region originated from Ru-Py. Meanwhile, Ru-Py played an important role in accelerating the separation of photoinduced electron-hole pairs evidenced by the photoluminescence spectra. PEC CO 2 reduction test showed that 84.8 μmol methanol was produced with 63.9% faraday efficiency, 62.6 turnover number (TON) and 45% selectivity at −0.9 V under 8 h irradiation. Furthermore, the non-covalent bonded system only produced 41.3 μmol methanol indicating that the carboxylic covalent linking displayed excellent electron transfer efficiency and methanolization performance. The mechanism investigation revealed that the exposed pyridyl provided the active sites in forming pyridiniumformate intermediates confirmed by the differential UV–vis absorption ( ΔA ) spectrum, which was of great significance in the efficient CO 2 methanolization. The probable reaction pathway for catalytic CO 2 reduction to methanol was also proposed combining the possible intermediates detected by gas chromatography mass spectrometry (GCMS).
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）