JOURNAL OF CRYSTAL GROWTH
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2024
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IF 1.7
Jingyi Yu,Hao Sun,Cong Zheng,Weiwei Jiang,Nan Wang,Zhiqiang Li,Sumei Wu,Hualong Tao,Tingting Yao,Hualin Wang,Shimin Liu,Chaoqian Liu,Wanyu Ding,Zhihua Zhang
Pure TiO 2 , Sn/Cl co-doped TiO2 and Sn/Cl co-doped TiO 2 -ZnO were fabricated and compared by a novel one-pot method to improve the photocatalytic performance of pure TiO2, which accomplishes the construction of heterojunctions simultaneously with doping by volatile solid solution. TG-DSC, XRD, FTIR, XPS, SEM, EDS, TEM, SAED, UV–Vis, PL and EIS were characterized to investigate the influence mechanism of Sn/Cl co-doping and ZnO content (0, 25, 50, 75, and 100 mol.%) on the thermal effect, crystal structure, morphology, composition, charge transfer behavior and photocatalytic performance of samples. Results indicate that ZnO appears and SnO2 disappears simultaneously with anatase TiO2 as the main phase by increasing ZnO content, and the morphology is changed from irregular sphere to sphere-sheet and sphere-plate correspondingly. The photocatalytic degradation efficiency first increases and then decreases, and achieves the maximum value of 73 % by SCT/Z50 which has sphere-sheet heterostructure containing more hydroxyl radicals, under 15 W weak-UV light irradiations for 3 h using methyl orange (MO) as pollutant. The excellent photocatalytic performance is attributed to the structural and morphological effects of Sn/Cl co-doping and ZnO introduction, which can increase the electron-hole separation efficiency. The optimized composition also has great potential in practical photocatalytic application due to the commercial advantage that ZnO is much cheaper than TiO2.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Tian Lan,Weidong Sun,Xuerong Shi,Yong Lu
Intrinsic safety chemical looping-oxidative coupling of methane (CL-OCM) is an attractive method for direct conversion of methane to ethylene, but well-qualified oxygen carrier catalyst still remains challenging. Herein, we report a promising Na 2 WO 4 -doped Mn 2 O 3 -TiO 2 catalyst toward high-efficiency CL-OCM process. The standout Na 2 WO 4 /2Mn1Ti (Mn 2 O 3 /TiO 2 weight ratio of 2/1) catalyst, with good cycling performance, achieves a high space time yield of 27.8 (or 22.9) g C2-C3 kg cat −1 h −1 with 19.5 % (or 15.7 %) CH 4 conversion and 80 % (or 82.7 %) C 2 -C 3 selectivity at 740 (or 720) o C and a low catalyst/CH 4 weight ratio of 13.5. The TiO 2 substantially lowers the CL-OCM reaction temperature, due to the establishment of a low-temperature light-off “Mn 2 O 3 + TiO 2 ↔ MnTiO 3 ” redox cycle with CH 4 /O 2 . The enabling role of Na 2 WO 4 in modulating the reaction of Mn 2 O 3 with CH 4 into OCM instead of combustion is theoretically unveiled, which in nature benefits the *CH 3 transfer and spontaneous desorption to form ∙CH 3 radicals.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Jing Li,Wenyu Xie,Rong Shao,Xionghua Ju,Hongbo Li
The development of cost-effective and highly sensitive SO 2 sensors is an urgent task since SO 2 causes worldwide serious environmental security and human diseases. Herein, a first photoelectrochemical (PEC) sensing platform for SO 2 was constructed based on Ba 2+ doped amorphous TiO 2 hollow spheres. They were successfully prepared by SiO 2 template method before in situ Ba 2+ ions exchanging and doping. Before assay, SO 2 was oxidized by hydrogen peroxide and generated H 2 SO 4 , which was further neutralized by NaOH resulting in the generation of Na 2 SO 4 . When it reacted with Ba 2+ -doped TiO 2 hollow spheres, the produced BaSO 4 nanoparticles leaded to the photocurrent remarkably decreased due to the photo-induced electron pathways shut down. The fabricated PEC sensor was linear with the concentration of SO 4 2− in the range from 1 to 4000 pmol L −1 with a detection limit of 0.4 pmol L −1 . The other conventional species did not interfere in the detection of SO 4 2− in aqueous system and the fabricated PEC sensor was successfully applied in monitoring of SO 2 in industry waste gas. It demonstrated good performance including wide dynamic linear range, high selectivity, ultrasensitivity, excellent stability and low cost. This strategy paves a new way for other similar air pollutants.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Ruyi Zhong,Zisheng Zhang,Huqiang Yi,Lei Zeng,Chao Tang,Limin Huang,Meng Gu
Visible-light photocatalytic hydrogen evolution is a key step towards utilizing solar energy. Here we constructed covalently bonded oxidized graphitic C 3 N 4 /TiO 2 (O-g-C 3 N 4 /TiO 2 ) heterostructure with high surface area via an in-situ solvothermal synthetic strategy. The edge-anchoring of two-dimensional (2D) TiO 2 on 2D O-g-C 3 N 4 was evidenced by the HAADF-STEM EDS mapping, EELS and XPS analysis. Density functional theory computations suggest strong affinity between TiO 2 and O-g-C 3 N 4 2D structures through N O Ti covalent bonding, which drastically enhances the synergetic effect of the light absorption of O-g-C 3 N 4 and high surface area of TiO 2 . The as-formed heterojunction can remarkably boost the visible-light photocatalytic activity for H 2 evolution by 6.1 times compared to physical mixture of TiO 2 nanosheets (NS) and O-g-C 3 N 4 .
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APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Li Cao,Lei Chen,Xiaodong Wu,Rui Ran,Tengfei Xu,Ze Chen,Duan Weng
The CeO 2 /TiO 2 catalyst was prepared by a deposition-precipitation method, which exhibited high low-temperature activity under the fast SCR condition. By using transient reaction analysis (TRA), the steps in the fast SCR, including NO 2 adsorption and decomposition, reaction between nitrates and NO, ammonium nitrate formation and reduction by NO, were investigated. Diffuses reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments, via NO + O 2 or NO + NO 2 adsorption, ammonium species reaction with NO x and NO reaction with NH 4 NO 3 , were designed to identify the roles of NO, NO 2 and NH 3 in fast SCR. Based on L-H mechanism, the NH 4 NO 3 formation played an important role in low-temperature SCR reaction. Compared with the behavior in standard SCR, the higher activity in the presence of NO 2 was ascribed to the faster NH 4 NO 3 formation rate and larger amounts of nitrates/nitrites. This phenomenon provided a basis for developing Ce-based catalysts as SCR catalysts for diesel exhaust aftertreatment.
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MATERIALS RESEARCH BULLETIN
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2017
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IF 2.446
Xiao-yu Sun,Chang Liu,Zheng Chen,Yong-qing Ma
In order to reveal the effects of dopant average valence on the photocatalytic performance, Ta and Rh co-doped Ti 0.96 Ta 0.04−x Rh x O 2 (x = 0, 0.008, 0.016, 0.02, 0.024, 0.032, and 0.04) samples were crystallized at 450 °C and 800 °C, respectively; then the 800 °C crystallized x = 0.02 sample was subsequently reduced in the H 2 /N 2 mixture gases at 600, 700, 800, and 900 °C. Under different processing conditions, Ta remains the valence of +5, while the valence of Rh varies. Rh exhibits Rh 3+ and Rh 4+ in the 450 °C crystallized samples and is completely oxidized to Rh 4+ in the 800 °C crystallized samples. In the reduced samples, Rh exists in the forms of Rh, Rh 3+ and Rh 4+ . The optimal photocatalyst is obtained as the ratio of Rh 3+ /Rh 4+ is 2.11 or the average valence of doped Ta and Rh is closest to the +4 valence of substituted Ti.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 3
·C145
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IF 3.662
Xuehui Liu,Chuanjun Gu,Zheng Ma,Xiumin Ma,Baorong Hou
In this study, TiO2 containers with an empty core and a mesoporous shell were successfully synthesized via hydrothermal reaction. The as-prepared TiO2 was used as carrier to load the corrosion inhibitor 2-mercaptobenzimidazole (MBI). The outer shell of inhibitor-loaded containers was modified by a SiO2 film, which was obtained from hydrolysis of tetraethyl orthosilicate (TEOS) and (3-aminopropyl) triethoxysilane (APTES). The structure of the TiO2 containers was studied using X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), and Fourier transform infrared (FTIR) spectrometry. The release behavior of the corrosion inhibitor was investigated using UV-visible spectroscopy. The corrosion protection performance of the water-based epoxy coating with modified TiO2 containers was studied by using electrochemical impedance spectroscopy (EIS) and a scanning Kelvin probe (SKP). The coating with modified TiO2 containers demonstrated enhanced film barrier properties compared with blank coating. Results obtained from SKP measurements confirmed active corrosion protection performance of the studied TiO2 containers.
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Journal of the Taiwan Institute of Chemical Engineers
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2017
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IF 4.217
Meng Li,Zipeng Xing,Jiaojiao Jiang,Zhenzi Li,Junwei Yin,Junyan Kuang,Siyu Tan,Qi Zhu,Wei Zhou
A novel plasmonic Ag decorated S-TiO 2− x nanorods are successfully fabricated under 700 °C calcination, then followed by an in-situ solid-state chemical reduction approach with NaBH 4 in a mild calcination (350 °C) and combined with photo-deposition approach. The resultant Ag/S-TiO 2− x sample with high crystallinity and narrow band gap of ∼2.39 eV, extends the photoresponse to near-infrared region. The visible-light-driven photocatalytic degradation rate of phenol and hydrogen production rate for Ag/S-TiO 2− x nanorods are as high as 98.67% and 209.2 µmol h −1 g −1 , which is about 2 and 5 times higher than that of S-TiO 2 . Especially, first-order reaction rate constant of Ag/S-TiO 2− x nanorods is 14 times higher than that of S-TiO 2 . The excellent photocatalytic property can be attributed to the synergistic effect of Ti 3+ self-doping, S doping and the enhanced surface plasmon resonance of Ag nanoparticles, which narrows the band gap, favors the visible light utilization, and promotes the separation of photogenerated charge carriers.
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THIN SOLID FILMS
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2018
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IF 1.939
Jian Wu,Hongning Wang,Lei Bao,Jing Zhong,Ruoyu Chen,Lin Sun
Uniform raspberry-like hollow SiO 2 @TiO 2 composite nanospheres (hSiO 2 @TiO 2 ) have been designed and prepared via a colloidal assembly method. Series of characterizations, such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy , high resolution transmission electron microscopy, thermogravimetry , and derivative thermogravity, have been carried out to analyze the composition, structure and morphology of the composite. The dispersion of TiO 2 nanoparticles on the outer shell of hollow SiO 2 (hSiO 2 ) nanospheres could be effectively tuned via employing H 2 O 2 as a hydroxyl modifier to repair the Si O bonds of the hSiO 2 . The effects of silanol content of hSiO 2 and the Si/Ti ratios were investigated in detail. This unique structure with refractive index of 1.218 and transmittance over 99% exhibited excellent self-cleaning capability when served as antireflective coatings.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 8
·4797-4807
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IF 1.674
Zhang Weiwei,Zhou Yi,Dong Chunyang,Shen Bin,Xing Mingyang,Zhang Jinlong
We introduce a facile method to synthesize carbon quantum dots/titanium dioxide mesoporous single crystals (CQDs–MSCs). CQDs were synthesized using a pyrolysis method with citric acid as carbon precursor. V-CQDs–MSCs composite was prepared using a vacuum activation method and exhibited enhanced photocatalytic activity. The composites were characterized by diffuse reflectance spectroscopy (DRS), electron paramagnetic resonance (EPR), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) analysis, and thermogravimetry (TG) analysis. XPS results indicated that CQDs were bonded on the surface of MSCs by formation of Ti–O–C bonds, which played an important role in transfer of photogenerated electrons from Ti 3+ –TiO 2 to CQDs. V-CQDs–MSCs obtained using CQD loading content of 2% and vacuum activation temperature of 600 °C showed the highest photocatalytic activity for degradation of phenol under simulated solar light irradiation.
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Journal of Nanomaterials
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2017
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IF 1.871
Yaxiong Ji,Xing Rong,Hong Zhong,Yuanhao Wang,Shifeng Wang,Lin Lu
We report a brand new recycling route of waste marble powder, by means of surface modification with homemade nano-TiO2 particles to produce low cost coating materials for the application in air quality improvement. The as-prepared nano-TiO2 in anatase phase exhibits excellent photocatalytic characteristic, reflected by the high degradation rate of over 95% of methylene blue within 6 hours of UV irradiation. The prepared coating consisting of nano-TiO2 clad marble powder was tested by monitoring the decomposition rate of formaldehyde gas. A high degradation efficiency of about 95% within 9 hours of illumination is achieved, demonstrating a promising potential for removing the harmful and toxic organic pollutants in air while applying this coating in buildings both interiorly and exteriorly.
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JOURNAL OF MEMBRANE SCIENCE
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2018
·
IF 6.578
Dongliang Qian,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Water pollution has led to increased attention on wastewater treatment and renewable industries. Various materials have been developed for removing pollutants from water. However, materials capable of emulsion separation and soluble-contaminant degradation in a single step are rare. We report a TiO 2 /sulfonated graphene oxide/Ag nanoparticle (TSA) membrane, which possesses useful wettability and photocatalytic properties. A photocatalytic TiO 2 nanorod array-based mesh with favorable wettability properties is integrated with a sulfonated graphene oxide/Ag layer, to form a bifunctional TSA membrane. The membrane exhibits excellent oil/water separation performance, and efficient photodegradation of solubilized methylene blue under ultraviolet irradiation. The membrane also exhibits excellent stability and durability, with a water contact angle of > 150°, and a high separation efficiency after 10 consecutive cycles. The membrane therefore has potential in sewage and wastewater treatment.
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