JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2019
·Vol. 66
·期 7
·740-747
·
IF 1.188
Chenghao Mo,Huixian Wei,Tongjun Wang
Self-doped TiO 2 nanotube array (DTNA) electrodes were fabricated through anodic oxidation combined with cathodic reduction. The morphology and structural features of pristine TiO 2 nanotube arrays and DTNA electrodes were studied through scanning electron microscopy, X-ray diffractometry, and X-ray photoelectron spectroscopy. An accelerated life test was used to test the electrode service lifetime and thus the electrode's stability. The service lifetime of the DTNA electrode prepared at constant 40 V for 6 hr was approximately 338.7 hr at constant 1 mA/cm 2 in a 1 M NaClO 4 solution. Methyl orange (MO) was employed as the degradation probe for measuring electrochemical oxidation performance. The color removal rate of 200 mg/L MO of the DTNA electrode (85.2% at 1 mA/cm 2 ) was greater than that of the Ti/IrO 2 electrode (31.1% at 1 mA/cm 2 ). The larger the surface area of the DTNA electrode is, the more conductive the electrode is for the degradation of organic substances. Organic degradation on the DTNA electrode occurred primarily through an indirect pathway (producing [∙OH]).
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 11
·4046-4055
·
IF 8.897
Xu Yue,Zhao Chenxi,Zhang Xi,Xu Jingwen,Yang Lingling,Zhang Zhechen,Gao Zhida,Song Yan-Yan
Infectious diseases caused by bacteria are a global threat to the human health. Here, we propose a solvent “irrigation” technique to endow TiO 2 nanotubes (NTs) to precisely modify with functional nanomaterials, and apply them in constructing a near-infrared (NIR) light controlled drug-delivery system for rapid necrosis of bacteria. In this design, the NIR stimuli-responsive functional shell is located on the external tube wall of TiO 2 NT; the internal tube wall offers sufficient binding sites for drug loading. Using kanamycin as a model drug, we demonstrate that the reactive oxygen species generated in photocatalysis not only controllably release the loaded drug by scissoring the linked chains, but also effectively compromise bacteria membrane integrity by damaging the cell wall. Benefiting from the damages, antibiotics rapidly enter the bacteria and reach ≥99.9% reduction in Escherichia coli colony within only 2 h. Importantly, such a covalently conjugation-based delivery system can efficiently relieve radical-induced inflammation and cytotoxicity. This study provides an innovative design strategy for engineering delivery systems with tailorable components, enduring stimuli-response by multiple triggers.
研究领域:
生物材料学
·
纳米医学
·
抗菌研究
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 28
·16776-16782
·
IF 3.119
Guo-Min Liu,Wen-Yuan Jia,Qiu-Shi Jiang,Zhi-Qiang Cheng
Exploiting photocatalysts with characteristics of low cost, high reactivity and good recyclability is a great significance for environmental remediation and energy conversion. Herein, hollow TiO2 nanotubes were fabricated by a novel and efficient method via electrospinning and an impregnation calcination method. With the hydrothermal method, the CdS nanoparticles were modified on the surface and in walls of the TiO2 nanotubes. By changing the reaction conditions, the morphology of CdS nanoparticles presents a controllable three-dimensional (3D) structure. The morphology of the samples was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure and components of samples were characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). The light absorption efficiency was detected using UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL). The photocatalytic properties were evaluated by degradation of methyl orange (MO) and photocatalytic hydrogen evolution under visible light irradiation. From the results, the TiO2/CdS nanotubes exhibit better photocatalytic activity than the pure TiO2. The synthetic mechanism of TiO2/CdS heterostructures and a possible photocatalytic mechanism based on the experimental results were proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemPhotoChem
·
2020
·Vol. 4
·期 5
·366-372
·
IF 2.838
Yajun Bi,Jiadong Li,Changchang Dong,Wei Mu,Xiaojun Han
Graphical Clean up, clean up : A new heterostructured photocatalyst, MnCo 2 O 4.5 deposited TiO 2 nanotube arrays, was synthesized via a two-step anodization and chemical bath deposition method. The catalyst exhibited enhanced photocatalytic activity in the degradation of tetracycline under visible light irradiation compared with pure TiO 2 nanotube arrays. A novel type of heterostructured photocatalyst, MnCo 2 O 4.5 deposited TiO 2 nanotube arrays (TNAs), was successfully synthesized via a two-step anodization and chemical bath deposition method. The decoration of MnCo 2 O 4.5 nanoparticles on anatase TNAs significantly enhances its photocatalytic degradation activity of tetracycline (TC). The optimized 140MnCo 2 O 4.5 /TiO 2 nanotube arrays (140 M/TNA) catalyst exhibited the highest photocatalytic degradation of TC with an efficiency of 93.1 % after 2 h illumination. Meanwhile, the material showed good stability after a 5 cycle test. The mechanism of increased activity is attributed to the MnCo 2 O 4.5 /TiO 2 heterostructure, which extends the response range to visible light and promotes electron–hole separation. Further radical capture experiment reveals that . O 2 − is vital as an active species for degrading TC in this system. The photocatalyst obtained via this rational synthesis strategy can effectively remove organic pollutants from waste water under visible light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
IET Nanobiotechnology
·
2018
·Vol. 12
·期 4
·441-445
·
IF 2.059
Xiaojie Song,Xianyang Shi,Mi Yang
Biosynthesised nanocomposites have attracted growing interests attributed to their ‘green’ synthesis nature in recent years. Shewanella oneidensis MR-1, a dissimilatory metal-reducing bacterium, was used to reduce palladium (II) nitrate to palladium (0) nanoparticles (Pd NPs) under anaerobic conditions, resulting in the in situ formation of Pd NPs immobilised on TiO 2 nanotubes (TNTs) (Pd/TNTs nanocomposites). The Pd/TNTs nanocomposites were characterised by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray, and electron spin resonance, respectively. The results indicated that Pd NPs are successfully grown on the TNTs without aggregation. Photocatalytic degradation of methylene blue (MB) by Pd/TNTs nanocomposites under simulated sunlight was also investigated. Pd/TNTs nanocomposites had photocatalytic efficiency superior to that of single TiO 2 nanomaterials. The photocatalytic activity of Pd/TNTs nanocomposites can be enhanced by S. oneidensis MR-1. The results showed that after only 10 min, the degradation ratio of MB reached 98.7% by Pd/TNTs nanocomposites when simultaneously assisted with S. oneidensis MR-1.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Chemistry & Engineering
·
2022
·Vol. 7
·期 4
·917-928
·
IF 5.2
Tongxin Xiao,Ying Chen,Yuning Liang
The conversion of CO2 and water into valuable chemicals under sunlight irradiation is of great significance for solving the widespread problems of both limited energy sources and global warming. In this work, new artificial photosynthesis was established through a photocatalysis process of reducing CO2 to CH4. A photocatalyst compounded from a porphyrin (metalloporphyrin) and TiO2 nanotube arrays (TiO2NTs) was prepared, and its photocatalytic performance for CO2 reduction under Xe lamp irradiation was studied. Compared with the pure TiO2NTs, the photocatalytic CO2 reduction activity of metalloporphyrin-sensitized TiO2NTs is significantly enhanced. The amount of methane produced with the cobalt tetra(4-carboxyphenyl)porphyrin/TiO2NTs (CoTCPP/TiO2NTs) photocatalyst is about 5.5 times higher than that produced with TiO2NTs alone. The improvement of photocatalytic activity can be ascribed to the enhancement of light absorption ability of CoTCPP/TiO2NTs and the inhibition of electron–hole recombination. Furthermore, according to the results of the photocatalytic and photo(electro)chemical experiments, a probable mechanism for the photoreduction of CO2 over CoTCPP/TiO2NTs is presented.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Qiao Lu,Changchang Dong,Feng Wei,Jiadong Li,Zhao Wang,Wei Mu,Xiaojun Han
Photocatalysis shows great potential in pollution degradation without environmental harm. Herein, TiO 2 nanotube arrays (TNTAs) were prepared on titanium mesh by an anodic oxidation method, and Bi 2 WO 6 /TiO 2 nanocomposites (BWO/TNTAs) with different Bi 2 WO 6 contents were synthesized by a hydrothermal method. The Bi 2 WO 6 nanosheets decorated on TNTAs significantly improved the photocatalytic degradation of tetracycline (TC). 0.2BWO/TNTAs exhibited the degrading rate of 92.2% within 180 min under visible light. The enhancement of photocatalytic performance was ascribed to the II-type mechanism via Bi 2 WO 6 coupled with TiO 2 , which further extended the visible light absorption range and promoted the charge separation. In addition, •OH is the main active species to dominate the degradation of TC. The possible decomposition mechanism of TC was proposed by gradual loss of hydroxyl groups and C-ring cleavage. It provides a feasible strategy to remove organic pollutants for wastewater treatment.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jianhui Xu,Xin Fu,Yufeng Liu,Yunfei Zhang,Shenggui Chen,Dan Li,Chunhui Zhang,Jiale Gao,Yibo Fu
Electrocatalytic hydrodechlorination technology provides an attractive strategy to effectively eliminate the biotoxicity of halogenated organic pollutants (HOPs). Herein, we demonstrated a highly dispersed Pd loaded on blue TiO 2 nanotube arrays (Pd x -BTNA) cathode that can achieve efficient dechlorination and detoxification toward florfenicol (FLO). Characterization results indicated that strong interaction between Pd and BTNA was achieved through Pd-O bonds, which facilitated the electron transfer rate. Pd x -BTNA significantly outperformed other cathodes (i.e., BTNA, Pd x -TNA and Pd x -Ti) in the electrocatalytic dechlorination of FLO due to enhanced utilization of active H*. The dechlorination performances of FLO well followed the pseudo-first-order kinetic, and the reaction constant rate on Pd x -BTNA cathode (0.035 min −1 ) was 17.5, 1.94, 7.0 times higher than that on BTNA, Pd x -TNA and Pd x -Ti cathodes, respectively. Quenching experiments and electrochemical characterization indicated that both direct electron transfer and indirect reduction process mediated by H* were involved in the dechlorination of FLO. The optimal dechlorination efficiency of 98.79% was obtained by Pd x -BTNA cathode within 120 min at 1 mM PdCl 2 , applied cathode potential of −1.2 V. In addition, Pd x -BTNA exhibited superior stability and durability with almost no Pd leaching (0.0011 mg/L) during five dechlorination cycles. Our research proposed a novel strategy to design low noble Pd-loaded cathode material for efficient dechlorination and detoxification of HOPs.
研究领域:
环境科学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haoying Wang,Jie Li,Huijie Shi,Siqi Xie,Chaojie Zhang,Guohua Zhao
Photoelectrocatalytic (PEC) reduction and removal of atrazine, one typical endocrine disruptor chemical, was achieved on Pd quantum dots modified TiO2 nanotubes (PdQDs@TiO2NTs) under regulating potentials. Compared with that on TiO2NTs, the PEC reduction efficiency of atrazine on PdQDs@TiO2NTs significantly increased, mainly attributed to the reduced electron transfer resistance, longer lifetime of the photogenerated electrons and the faster electron injection from the catalyst to atrazine in the solution. Meanwhile, PdQDs could also function as cocatalyst so that the electrocatalytic activity of PdQDs@TiO2NTs was evidently improved. Moreover, the investigation indicated that the applied potential not only played important role in accelerating the separation of photogenerated electrons and holes, but also with the increment of the cathodic potential, the PEC reduction mechanism of atrazine underwent the variation of electro-assisted photocatalysis, synergetic photoelectro-catalysis, and photoassisted electro-catalysis. A highest atrazine PEC reduction efficiency was achieved as 99.5% on PdQDs@TiO2NTs in about 5 h under the potential of −1.3 V vs. SCE, whereas the highest synergetic effect of photo- and electro- catalysis was achieved at a lower potential of −0.9 V vs. SCE.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Longhua Ding,Chao Ma,Li Li,Lina Zhang,Jinghua Yu
A facile photoelectrochemical sensor for the determination of hydrogen sulfide (H 2 S) is developed. Photocurrent is generated through the grafting of CdS nanoparticles covalently and in situ onto TiO 2 nanotubes . The surface of TiO 2 nanotubes was modified by a layer of thioglycolic acid (TGA) to introduce thiol groups which can adsorb and immobilize Cd ions . CdS nanoparticles would be formed onto TiO 2 nanotubes after treating with exogenous or endogenous H 2 S. Both the exogenous and H 2 S released from cancer cells were detected based on the photoelectric properties of CdS nanoparticles. And a wide linear range (10 nM–10 6 nM) was achieved with a detection limit of 0.7 nM.
研究领域:
分析化学
·
生物医学工程
·
癌症研究
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Tongxin Xiao,Ying Chen,Yuning Liang
The photocatalytic conversion of CO2 into hydrocarbon fuels by utilizing abundant solar energy is a promising and eco-friendly approach to address the energy crisis and global warming. In this work, the sensitizer Ni(II) tetra(4-carboxylphenyl)porphyrin (NiTCPP) was successfully combined with TiO2 nanotube arrays (TiO2NTs) by three methods, and their performances in the photocatalytic reduction of CO2 under simulated solar irradiation were studied. The results showed that NiTCPP/TiO2NTs exhibit a greatly ameliorated photocatalytic activity, and the photocatalytic reduction activities of NiTCPP/TiO2NTs prepared by different methods were different. The catalyst prepared by the impregnation method displayed the highest photoreduction efficiency. The reduction rate of CO2 into CH4 was up to 33.89 μmol/cm2/h with a quantum efficiency of 0.65% (at 420 nm), about 5 times that of the bare TiO2NTs. The introduction of NiTCPP not only efficiently expands the light absorption range but also enhances the charge separation efficiency. Furthermore, a possible mechanism of its CO2 photoreduction performances was systematically presented.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Fanhua Yu,Shaojie Hong,Bin Guo,Xiangqian Ren,Xingfu Zhou
Ozone water is widely used in disinfection area and wastewater treatment due to its strong oxidation. Recent studies have found that Ti/SnO 2 -Sb-Ni (NATO) anode has higher O 3 generation efficiency due to its higher oxygen evolution potential. In this paper, TiO 2 nanotubes (TiO 2 -NTs) were prepared by anodic oxidation method as the basic substrate material for the Ti/SnO 2 -Sb-Ni electrode, and SnO 2 -Sb-Bi was introduced as the intermediate layer to investigate the electro-synthesis of ozonated water. Studies show that the modification of the TiO 2 -NTs substrate provides a larger specific surface area for the reaction and accelerates the transfer of electrons from the oxide layer to the substrate. The introduction of the SnO 2 -Sb-Bi intermediate layer effectively delays the electrode deactivation and also enhances the electron transport. When the Ti/TiO 2 NTs/SnO 2 -Sb-Bi/NATO electrode was used and electrolyzed for 15 min, the ozone water concentration reached 13.15 mg L −1 , about twice as much as the unmodified electrode. The effects of current density and the coating numbers of active layers on the electrosynthesis of the ozonated water were also investigated. Finally, the application of ozonated water in the decolorization of organic dye wastewater was investigated based on its strong oxidation property, the degradation rate of 40 ppm methylene blue reached 94.5 % and the COD removal rate reached 72.9 % in 30 min. In addition, the cell voltage remained constant during decoloration, indicating the good stability of the electrode. This study also opens a door to the rapid electrochemically decoloration of wastewater and sterilization area by using electrochemically obtainable ozone water.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 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）