CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Suqing Wu,Haiyang Hu,Yan Lin,Junliang Zhang,Yun Hang Hu
TiO 2 is widely exploited as a photocatalyst to degrade antibiotic residues in water under UV irradiation, but it is inefficient for visible light photocatalysis due to its large band gap. Herein, it is the first time to report the photodegradation of tetracycline (TC) over TiO 2 under visible light irradiation. 25.1% of removal efficiency for TC was achieved even under 700 nm light irradiation. Furthermore, it was demonstrated that O 2 − species, which were generated from photoexciting of a surface complex between TC molecules and TiO 2 , played a critical role in the visible light photocatalytic degradation of TC. In addition, it was found that the visible light photocatalytic degradation generated different active species and intermediate products from those under UV irradiation. N-doped TiO 2 exhibited even better performance for visible-light photocatalytic degradation of TC with higher removal efficiency and larger mineralization rate, which followed different degradation-mechanism.
研究领域:
环境科学
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化学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
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IF 8.8
Guobo Li,Yaping Zhang,Peng Wu,Kai Shen,Shule Zhang,Shipeng Ding
The synergistic degradation of VOCs and NO x that were emitted from the incineration of municipal and medical wastes by a single catalyst is challenging, due to the poor activity at low temperatures, and the SO 2 poisoning on the active sites. Herein, N-doped TiO 2 (N–TiO 2 ) was used as the support for designing a highly efficient and stable catalyst system for CB/NO x synergistic degradation even in the presence of SO 2 . The prepared SbPdV/N–TiO 2 catalyst, which presented excellent activity and tolerance to SO 2 in the CBCO + SCR process, was investigated by a series of characterizations (such as XRD, TPD, XPS, H 2 -TPR and so on) as well as DFT calculations . The electronic structure of the catalyst was effectively modulated after N doping, resulting in effective charge flow between the catalyst surface and gas molecules. More importantly, the adsorption and deposition of sulfur species and reaction transient intermediates on active centers were restrained, while a new N adsorption center for NO x was provided. Abundant adsorption centers and superior redox properties ensured smooth CB/NO x synergistic degradation. The removal of CB mainly follows the L-H mechanism, while NO x elimination follows both E-R and L-H mechanisms. As a result, N doping provides a new approach to develop more advanced anti-SO 2 poisoning CB/NO x synergistic catalytic removal systems for extensive applications.
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 3
·447-452
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IF 1.063
He Yilei,Zhang Xing,Wei Yanze,Chen Xiaoyu,Wang Zumin,Yu Ranbo
Nanostructured N-doped TiO 2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH 2 -MIL-125(Ti)] precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N-doped TiO 2 (N-TiO 2 ) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min −1 than that of the TiO 2 -P25 and TiO 2 under the visible light.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
CHEMICAL PAPERS
·
2020
·Vol. 75
·期 1
·115-122
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IF 1.68
Gao Jie,Zhang Lingfan,Qian Junchao,Chen Feng,Zhang Wenqing
N-doped TiO 2 fiber membranes were prepared by electrospinning method and adsorptive chitosan was added as a nitrogen source. The obtained TiO 2 fiber membranes were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results show that the film has adsorption properties; furthermore, the morphology of the TiO 2 fiber with a chitosan content of 0.5 g after calcination provides the best catalytic performance; An anatase–rutile titania was found in the oxidized fiber film found in the Raman spectrum TiO 2 ; XPS demonstrated that the introduction of chitosan could replace N atom with partial lattice oxygen in TiO 2 . Moreover, the degradation rate of methylene blue of the material was about 60–80% after 4-h reaction, and the maximum degradation rate was achieved by nanofiber film with chitosan concentration of 0.5 g.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Advances in Natural Sciences-Nanoscience and Nanotechnology
·
2024
·Vol. 15
·期 1
·015008
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IF 1.7
Tai Thien Huynh,Quyen Huynh,Ngoc-Han T Huynh,Hau Quoc Pham
In this work, we prepared an Ir,N-doped TiO2 nanomaterial via a facile HNO3-assisted hydrothermal process that was used as an advanced support for nano-sized Pt nanoparticles (NPs) for the formic acid oxidation reaction (FAOR). The physical and electrochemical behaviours of the as-made Pt/Ir,N-doped TiO2 catalyst were systemically investigated through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), field emission scanning electron microscopes coupled with energy dispersive X-ray analysis (FE-SEM/EDX mapping), transmission electron microscopy (TEM), linear sweep voltammetry (LSV), Tafel slope, CO-stripping, and chronoamperometric (CA) test. The Pt NPs (ca. 3 nm) were anchored on the Ir,N-doped TiO2 support, being formed by a mixture of rutile and brookite with a particle size of several ten nanometers. Due to the small size and uniform distribution of Pt NPs, the Pt/Ir,N-doped TiO2 catalyst had an electrochemical surface area of 79.88 m2 g−1, which was greater than that of the commercial Pt/C (77.63 m2 g−1). In terms of the FAOR, the Pt/Ir,N-doped TiO2 catalyst showed a negative FAOR onset potential, high current density (11.85 mA cm−2), and superior CO-tolerance compared to the commercially available catalyst. Also, the as-made catalyst possessed high electrochemical durability after 3600 s for testing. The enhanced FAOR efficiency was assigned to the formation of a dual-doping effect and strong interplay between Pt and TiO2-based support, which not only improved the electron transfer but also weakened the adsorption of carbonaceous species, thereby boosting the reaction kinetics. This study could open up a facile but effective strategy to promote particular electrochemical applications.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Sustainability
·
2022
·Vol. 14
·期 17
·10614
·
IF 3.889
Anqi Wang,Wei Chen,Nannan Geng,Xiaomeng Lan,Mingxiang Liu,Xing Wu
Industrialization and urbanization have resulted in large volumes of municipal wastewater containing abundant refractory humic acid (HA), which is difficult to biodegrade with carcinogenic byproducts and has posed a great threat to human health. Photocatalysis is a promising advanced oxidation process (AOP) for the efficient degradation of HA. In this work, a novel three-step electrochemical method was employed to fabricate electrochemically converted N-doped TiO2nanotubes/graphene (ENTG) composite film. Compared with traditional hydrothermally synthesized N-doped TiO2/graphene (NTG) nanoparticles, the ENTG photocatalyst exhibited enhanced degradation performance, recyclability and stability. It was found that ETNG can extend the range of light absorption to over 400 nm and narrow the band gap to 2.7 eV. The degradation rate for HA was up to 92.3% under the optimum condition. The preparation mechanism for ENTG is based on an electrochemical reduction–deposition hypothesis, while the degradation mechanism is dependent on adsorption and free radical oxidation. According to a free radical quenching test, both •OH and •O2−radicals were produced, and •OH played the dominant role in HA degradation. In general, ENTG is a promising photocatalyst for further application in municipal wastewater treatment.Keywords:electrochemically fabricated;N-doped TiO2/graphene;photocatalytic degradation;humic acid;municipal wastewater treatment
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
Catalysts
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2021
·Vol. 12
·期 1
·22
·
IF 4.146
Jingfei Luan,Zhijie Wei,Bowen Niu,Guangmin Yang,Cisheng Huang,Bingbing Ma,Wenlu Liu
A new type of Gd2BiTaO7nanocatalyst (GBT) was synthesized by a high-temperature solid-phase method, and a heterojunction photocatalyst, which was composed of GBT and silver phosphate (AP), was prepared by the facile in-situ precipitation method for the first time. The photocatalytic property of GBT or the Ag3PO4/Gd2BiTaO7heterojunction photocatalyst (AGHP) was reported. The structural properties of GBT and AGHP were characterized by an X-ray diffractometer, scanning electron microscope–X-ray energy dispersive spectra, an X-ray photoelectron spectrograph, a synchrotron-based ultraviolet photoelectron spectroscope, a Fourier transform infrared spectrometer, an UV-Vis diffuse reflectance spectrophotometer and an electron paramagnetic resonance spectrometer. The results displayed that GBT was well crystallized with a stable cubic crystal system and space groupFd3m. The lattice parameter or band gap energy of GBT was found to be a = 10.740051 Å or 2.35 eV, respectively. After visible light irradiation of 30 min, the removal rate of bisphenol A (BPA) reached 99.52%, 95.53% or 37.00% with AGHP as the photocatalyst, with Ag3PO4and potassium persulfate (AP-PS) as photocatalysts or with N-doped TiO2(NT) as a photocatalyst, respectively. According to the experimental data, it could be found that the removal rate of BPA with AGHP as a photocatalyst was 2.69 times higher than that with NT as a photocatalyst. AGHP showed higher photocatalytic activity for photocatalytic degradation of BPA under visible light irradiation compared with GBT or AP-PS or NT. The removal rate of total organic carbon (TOC) was 96.21%, 88.10% or 30.55% with AGHP as a photocatalyst, with AP-PS as photocatalysts or with NT as a photocatalyst after visible light irradiation of 30 min. The above results indicated that AGHP possessed the maximal mineralization percentage ratio during the process of degrading BPA compared with GBT or AP-PS or NT. The results indicated that the main oxidation radical was•OH during the process of degrading BPA. The photocatalytic degradation of BPA with AGHP as a photocatalyst conformed to the first-order reaction kinetics. This study provided inspiration for obtaining visible light-responsive heterojunction photocatalysts with high catalytic activity and efficient removal technologies for organic pollutants and toxic pollutants, and as a result, the potential practical applications of visible light-responsive heterojunction photocatalysts were widened. The subsequent research of thin-film plating of the heterojunction catalysts and the construction of complete photoluminescent thin-film catalytic reaction systems, which utilized visible light irradiation, could provide new technologies and perspectives for the pharmaceutical wastewater treatment industry.Keywords:Gd2BiTaO7;Ag3PO4/Gd2BiTaO7heterojunction;potassium persulfate;bisphenol A;photocatalytic degradation;visible light irradiation;N-doped TiO2
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
高影响因子
Food Analytical Methods
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2022
·Vol. 15
·期 10
·2830-2839
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IF 3.498
Tang Jing,Li Jie,Liu Tianna,Tang Wenjing,Li Nali,Zheng Shengbiao,Guo Jiahao,Song Changchun
Electrochemical determination of tert-butylhydroquinone (TBHQ) is vital to food safety due to negative health effects; however, bare electrode of traditional electrochemical sensors generally has a narrow linear range and low sensitivity, limiting their practical application. Accordingly, the nano-architecture fabricated with N-doped TiO 2 –carbon nano-composites (TiO 2 /NC) is prepared by the thermolysis of NH 2 functionalized MIL-125(Ti) metal–organic frameworks (NH 2 -MIL-125(Ti)). TiO 2 /NC composites are firstly developed as the electrochemical material for electrochemical determination of TBHQ. The TiO 2 /NC composites with a highly porous structure, excellent conductivity and electron transportation, and large surface area show remarkable electrochemical oxidation ability for TBHQ. Under optimal conditions, TiO 2 /NC composite-modified electrode presents a broader linear response to TBHQ concentration of 0.05–100 μM with the detection limit as low as 4 nM (S/N = 3). Finally, the sensor platform is implemented directly to determine TBHQ in edible oil for evaluation of its practical application. TiO 2 /NC composites sensor fabricated perform larger linear range with high sensitivity and anti-interference properties, which can be used as a potential for electrochemical determination of TBHQ.
研究领域:
材料科学
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分析化学
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食品科学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 48
·e202303437
·
IF 2.1
Ms. Menghan Li,Xuan Luo,Tongming Su,Xinling Xie,Hongbing Ji,Zuzeng Qin
Graphical Preparation of NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst for catalytic cinnamaldehyde (CAL) hydrogenation by KBH 4 reduction. N-doped TiO 2 on Ti 3 C 2 , and N-doping substituted O in the TiO 2 lattice to create oxygen vacancies on the surface, increase the surface acidity, and adsorb C=O bonds, which resulted in high cinnamaldehyde conversion and cinnamyl alcohol (COL) selectivity after reaction 8 h. An NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst was prepared by KBH 4 reduction for cinnamaldehyde hydrogenation. Characterization results showed that the synthesis of N-doped TiO 2 on Ti 3 C 2 and the uniform dispersion of TiO 2 on the Ti 3 C 2 surface increased the specific surface area of NiZr/Ti 3 C 2 by 164.4 m 2 /g. N-doping at a level of 19.03 % was used to replace O in the TiO 2 lattice; the Ti−O−Ti peak in the XPS spectrum of the undoped catalyst was shifted by 0.3 eV in the spectrum of the doped catalyst; as a result, there was a 15.40 % increase in the number of surface oxygen vacancies of the NiZr/Ti 3 C 2 catalyst. The synthesis of N-doped TiO 2 on Ti 3 C 2 converted the moderately acidic sites of NiZr/Ti 3 C 2 to strong Lewis acid sites and increased the total number of acid sites by approximately 0.8-fold. The active Lewis acid sites on the surface of NiZr/N-doped TiO 2 /Ti 3 C 2 adsorbed only C=O bonds and inhibited the adsorption of C=C bonds, resulting in a high cinnamaldehyde conversion of 90.69 % and a cinnamyl alcohol selectivity of 91.87 %.
研究领域:
催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 2
·159
·
IF 4.501
Ye Yao,Jingfei Luan
The Gd2YSbO7/ZnBiNbO5heterojunction photocatalyst was synthesized for the first time by the facile in situ precipitation method. The structural properties of a Gd2YSbO7/ZnBiNbO5heterojunction photocatalyst were characterized by X-ray diffractometer, scanning electron microscope-X ray energy dispersive spectra, X-ray photoelectron spectrograph and UV-Vis diffuse reflectance spectrophotometer. The band gap energy (BGE) of Gd2YSbO7or ZnBiNbO5was found to be 2.396 eV or 2.696 eV, respectively. The photocatalytic property of Gd2YSbO7or ZnBiNbO5or Gd2YSbO7/ZnBiNbO5heterojunction photocatalyst (GZHP) was reported. After a visible-light irradiation of 145 minutes (VLI-145 min), the removal rate (RER) of benzotriazole reached 99.05%, 82.45%, 78.23% or 47.30% with Gd2YSbO7/ZnBiNbO5heterojunction (GZH), Gd2YSbO7, ZnBiNbO5or N-doped TiO2(NTO) as photocatalyst. In addition, the kinetic constant k, derived from the dynamic curve toward benzotriazole concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0213 min−1. Compared with Gd2YSbO7or ZnBiNbO5or NTO, GZHP showed maximal photocatalytic activity (PHA) for the photocatalytic degradation of benzotriazole under visible-light irradiation. The RER of total organic carbon during the photocatalytic degradation of benzotriazole reached 90.18%, 74.35%, 70.73% or 42.15% with GZH as a photocatalyst or with Gd2YSbO7, ZnBiNbO5or NTO as a photocatalyst after VLI-145 min. Moreover, the kinetic constant k, which came from the dynamic curve toward total organic carbon concentration and visible light irradiation time with GZH as a photocatalyst, reached 0.0110 min−1. Based on above results, GZHP showed the maximal mineralization percentage ratio when GZHP degraded benzotriazole. The results showed that hydroxyl radicals was the main oxidation radical during the degradation of benzotriazole. The photocatalytic degradation of benzotriazole with GZH as a photocatalyst conformed to the first-order reaction kinetics. Our research aimed to improve the photocatalytic properties of the single photocatalyst.Keywords:Gd2YSbO7;Gd2YSbO7/ZnBiNbO5heterojunction photocatalyst;benzotriazole;photocatalytic degradation;visible-light irradiation;N-doped TiO2;degradation pathway;degradation mechanism
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
Journal of Chemistry
·
2019
·
IF 1.727
Shiyun Tang,Jingyu Ran,Junjiang Guo,Anjiang Tang
To obtain high stable and effective TiO2 photocatalyst, nano-N-doped TiO2@SiO2 (TiO2−xNx@SiO2, 0 ≤ x ≤ 2) composite aerogels were synthesized by the sol-gel method combined with supercritical drying and direct oxidation process. The adsorption/photocatalytic degradation efficiency of TiO2−xNx@SiO2 aerogels was evaluated by the degradation of RhB in aqueous solution under visible light irradiation. The physiochemical properties of the aerogels were examined by XRD, FT-IR, TEM, SEM, TG/DTA, and BET methods. It was found that the specific surface areas of all TiO2−xNx@SiO2 samples exceeded 700 m2/g and exhibited a honeycomb porous structure with fine particulate morphology. Photocatalytic activity tests show that the 500-TiO2@SiO2 composite aerogel exhibits the best adsorption/photocatalytic degradation rate for RhB, which obtained about 80% of the degradation rate in 30 min under visible light and over 95% after 120 min. On the one hand, the SiO2 aerogels can significantly inhibit the phase transition of TiO2, and the nano TiO2 can be highly dispersed in the SiO2 aerogels; On the other hand, if the oxidation temperature is selected properly, the N-doped TiO2−xNx@SiO2 aerogel can be obtained by simple TiN@SiO2 aerogel oxidation.
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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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 21
·11676-11682
·
IF 3.049
Yong Wei,Jijiang Fu,Hao Song,Ben Zhang,Chaoran Pi,Lu Xia,Xuming Zhang,Biao Gao,Yang Zheng,Paul K. Chu
Efficient and stable non-precious metal based electrocatalysts are crucial to the hydrogen evolution reaction (HER) in renewable energy conversion. Herein, CoxP nanoparticles (NPs) are uniformly embedded in N-doped TiO2 nanotube arrays (CoxP/N-TiO2 NTAs) by low-temperature phosphorization of the precursor of metallic cobalt NPs embedded in N-doped TiO2 NTAs (Co/N-TiO2 NTAs) which were fabricated by phase separation of CoTiO3 NTAs in ammonia. Owing to the abundant exposed surface active sites of CoxP NPs, tight contact between the CoxP NPs and TiO2 NTAs, fast electron transfer in N-doped TiO2, and channels for effective diffusion of ions and H2 bubbles in the tubular structure, the CoxP/N-TiO2 NTAs have excellent electrocatalytic activity in HER exemplified by a low overpotential of 180 mV at 10 mA cm−2 and small Tafel slope of 51 mV dec−1 in 0.5 M H2SO4. The catalyst also shows long-term cycling stability and is a promising non-precious metal catalyst for HER.
研究领域:
材料科学
·
电化学
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可再生能源
·
催化
✓ 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）