APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 6
·e5612
·
IF 3.14
Na Zhang,Jiaqi Bu,Yong Meng,Jia Wan,Lu Yuan,Xin Peng
In this study, Ti-Si-Sn-Sb/GAC particle electrodes were prepared by sol–gel method. The particle electrodes were characterized by SEM, XRD, EDX, and BET then used to carry out three-dimensional (3D) electrocatalytic oxidation degradation on simulated refractory p-aminophenol (PAP) wastewater. The effects of initial pH, cell voltage, aeration flow rate and initial PAP concentration on degradation experiments were investigated. Under the optimal conditions, the PAP and COD removal rates were 89.45% and 75.17% respectively. In addition, the possible degradation mechanism of PAP was further investigated by UV–Vis and HPLC. Finally, it was found that the Ti-Si-Sn-Sb/GAC particle electrodes with high catalytic activity and excellent stability could significantly improve the PAP wastewater removal efficiency.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Chao Qu,Ghulam Sarwar Soomro,Na Ren,Da-wei Liang,Shan-fu Lu,Yan Xiang,Shu-jun Zhang
Recently, a novel proof-of-concept oxygen reduction reaction (ORR) based electro-oxidation (EO) process has been developed, which was accomplished by integrating anodic electrochemical oxidation coupled with an in situ electro-peroxone process, by harnessing the anodic by-product O 3 reacted with ORR cathode generated H 2 O 2 . To further enhance EO coupled in situ electro-peroxone, a nickel and antimony doped tin oxide anodic catalyst layer, namely NATO, was fabricated on Ti mesh to improve anodic oxidation and reinforce the generation of O 3 , thus promoting in situ Electro-peroxone. As a result, O 3 generation rate was enhanced by 12.6%. Complete phenol , as a model organic compound, and 95% of TOC removal were achieved, respectively, during ORR-EO. Through kinetics and instrument analysis, results show that the amount of intermediates accumulated during phenol degradation was much less in this Ti/NATO based ORR-EO system than in a traditional EO system. Moreover, 35.7% of the energy consumption was saved for ORR-EO, owing to its reduced applied voltage and the enhanced in situ electro-peroxone process.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 9
·2586-2596
·
IF 2.372
Shen Xiaohua,Wang Jingjing,Liu Miaoqing,Li Mengzhe,Lu Jianjun
Abstract A new route to synthesis hierarchical Ti-rich TS-1 with uniform intracrystalline mesopores, uniform crystal size and the higher Ti content has been developed by using the environmental-friendly and cheap surfactant Triton X-100 as the assisted template agent and (NH 4 ) 2 CO 3 as crystallization-mediating agent. In this way, the surface area and pore volume of the resulting materials can be adjusted by the Triton X-100 content. The catalytic properties of the Nano-size hierarchical Ti-rich TS-1 were investigated by hydroxylation of benzene to phenol with H 2 O 2 as oxidizing agent and deionized water as solvent. Due to the combination of hierarchical pores and high titanium content, the hierarchical Ti-rich TS-1 shows improved catalytic activity in the oxidation of benzene. Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Tianping Huang,Jianxin Zou,Huabing Liu,Wenjiang Ding
Three kinds of transition metal fluorides TMF x (TM = Nb, Co, Ti) were introduced into the 3NaBH 4 -GdF 3 hydrogen storage system via mechanical milling. Their effects on the hydrogen storage behaviors of 3NaBH 4 -GdF 3 were systematically investigated by means of DSC and volumetric methods. All TMF x exhibited promoting effect on hydrogen desorption properties of 3NaBH 4 -GdF 3 to different degrees, especially when NbF 5 or TiF 3 was added. For example, the hydrogen desorption peak temperature was decreased by 17 °C with doping 3 mol% of NbF 5 . Besides, TiF 3 improved also the hydrogen absorption capacity and reversibility of 3NaBH 4 -GdF 3 . Based on XRD analyses, the role of TMF x on the dehydrogenation and the promoting effect of TiF 3 on the reversibility of 3NaBH 4 -GdF 3 were clarified. This work helped to understand the combination effect of rare earth metal fluoride (GdF 3 ) and transition metal fluorides on the reversible hydrogen storage properties of NaBH 4 .
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2018
·
IF 3.414
Wei Li,Ming Li,Yi Yang,Qingsong Wei,Daosheng Cai,Jie Liu,Chunze Yan,Yusheng Shi
The microstructures and compressive properties of Ti-46.5Al-2.5Cr-2Nb-0.5Y alloy with varied boron (B) addition processed by selective laser melting (SLM) had been systematic studied. With increasing the B content from 0 to 2 wt%, the average grain size of SLM-processed Ti-46.5Al-2.5Cr-2Nb-0.5Y/B composites decreased from 16.64 µm to 5.66 µm, meanwhile, the {0001} texture index and high angle grain boundaries (HAGBs) increased from 10.78 and 87.9% to 22.69 and 94.4%. The phase evolution mechanism of Ti-46.5Al-2.5Cr-2Nb-0.5Y/B composites during the SLM process can be summarized as: firstly, β and B phases precipitated out from the liquid phase, then the β phase transformed to α phase and part of the α phase transferred to γ phase, later, some new phases of TiB 2 and AlB 2 emerged by the diffusion mechanism of B, Ti and Al atoms, and then the β and α phases orderly transformed to B 2 and α 2 , lastly, the γ, B 2 , B, TiB 2 , AlB 2 phases in a range of several hundred nanometers were randomly distributed within the α 2 matrix. Due to the grain refinement strengthening mechanism, the compressive strength and strain of Ti-46.5Al-2.5Cr-2Nb-0.5Y/B parts increased to the maximum of 1610.53 MPa and 5.17%.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Qi Liu,Xiaoming Cao,An Du,Ruina Ma,Xiaoran Zhang,Tingting Shi,Yongzhe Fan,Xue Zhao
In this paper, a chromate free conversion coating based on titanium/zirconium salts and aminotrimethylene phosphonic acid (ATMP) was prepared on 7A52 aluminum alloy. The morphology and composition of conversion coating were investigated by test measurements of SEM、EDS、XRD and FT-IR. The adhesion strength between aluminum matrix and subsequent epoxy primer was tested directly. The roughness and wettability of conversion coating were also detected to indirectly characterize the adhesion strength from another side. The electrochemical tests and neutral salt spray tests were also conducted to measure the corrosion resistance of the prepared conversion coating. Results reveal that a uniform and dense conversion coating consisted by metal oxides and other salts is obtained on the surface of 7A52 aluminum alloy. Significantly, the adhesion strength between matrix and epoxy primer increases from 7.97 MPa to 16.23 MPa, which dues to the increase of surface roughness and the improvement of wettability. In addition, the neutral salt spray test time of the conversion coating reaches as long as 120 h. Three orders of magnitudes decrease of current density proves the excellent corrosion resistance of conversion coating, which is also confirmed by electrochemical impedance spectroscopy test. This dues to the barrier property of conversion coating, preventing the corrosive solution to have a direct contact with aluminum matrix. Anyhow, both the adhesion strength and corrosion resistance are greatly reinforced by the existence of conversion coating.
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高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Chao Cai,Chrupcala Radoslaw,Jinliang Zhang,Qian Yan,Shifeng Wen,Bo Song,Yusheng Shi
In this study, the in-situ synthesized TiB/Ti-6Al-4Vceramic-matrix nanocomposites with greatly enhanced hardness and wear resistant property have been prepared via selective laser melting (SLM) using a simple mixture of microsized Ti-6Al-4V and TiB 2 powders. In order to provide a valuable reference for fabricating TiB/Ti-6Al-4V parts with metallographic features, effects of reinforcement content on microstructure and mechanical properties have been systematically investigated. It is found that during SLM process, the additive particles TiB 2 are totally transformed into need-like nanoscaled TiB phase, and the microstructure of composites is composed of mutual parallel strips architecture with TiB rich in some regions but lean in the other regions. The SLM-producedTiB/Ti-6Al-4 V composites exhibit superior nanohardness of 6.0 GPa, which is much higher than its traditional sintering counterpart. Moreover, the in-site synthesized TiB reinforcement can remarkably improve in the wear resistance properties, the wear loss of TiB-free sample is approximately 2 times than that of the sample with 3 wt% TiB 2 .
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高影响因子
ACS Catalysis
·
2013
·
IF 5.265
Wen-Juan Zhou,Raphael Wischert,Kai Xue,Yu-Ting Zheng,Belén Albela,Laurent Bonneviot,Jean-Marc Clacens,Floryan De Campo,Marc Pera-Titus,Peng Wu
Various types of Ti-containing zeolites, i.e., Ti-MWW, TS-1, Ti-MOR, and Ti-BEA, have been evaluated as candidates for the liquid-phase oxidation of cyclohexane using t-butyl hydroperoxide (TBHP, 7–8 wt %) as model oxidant. Ti-MWW zeolite displayed the highest activity for cyclohexanol and cyclohexanone (KA oil) with an overall selectivity higher than 90% at 80 °C, making this catalyst a candidate of choice for industrial KA oil production by deperoxidation of cyclohexyl hydroperoxide. The effect of the reaction temperature, reaction time, catalyst amount, and catalyst stability on Ti-MWW was surveyed in detail. The Ti-MWW catalyst showed a stable performance and could be recycled at least four times without detectable Ti leaching and loss of structural stability. The active sites for cyclohexane oxidation appeared to be located near external 12-ring cups in the Ti-MWW framework as suggested by a series of position-selective poisoning tests with tripropyl- and triphenylamine, impelling cyclohexane diffusion within the internal 10-ring channels. EPR experiments supported by DFT calculations suggested the coexistence of both Ti(IV)-OO• (peroxyl) and Ti(IV)-O• (oxyl) species generated through bimolecular pathways, implying simultaneously (SiO)3Ti(OOtBu) species and tBuOOH. The catalytic activity was strongly inhibited in the presence of alkenes, leading to the preferential formation of the epoxidation product with no detectable formation of radicals. Notably, this is the first time that oxyl species have been detected particularly with the help of DFT calculations. Predicted differences of g tensors between peroxyl and oxyl species at various hydration levels in the presence of cyclohexane were consistent with the EPR spectra.
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RSC Advances
·
2015
·Vol. 5
·期 103
·84856-84864
·
IF 3.84
Qianchi Ma,Lei Liu,Wei Cui,Ruifeng Li,Tingting Song,Zhaojie Cui
Model aqueous solutions of perfluorooctanoic acid (PFOA, 100 mg L−1) were electro-oxidized in a homemade container. The electrocatalytic behavior and anodic performance of Ti/SnO2–Sb/Yb–PbO2, Ti/SnO2–Sb–PbO2 and Ti/SnO2–Sb–Yb anodes in sodium electrolytes were compared. The SnO2–Sb/Yb–PbO2 anode demonstrated better electrocatalytic performance compared with the SnO2–Sb–PbO2 and SnO2–Sb–Yb electrodes in terms of both degradation and defluorination. Then a systematic experimental study was designed as follows to analyze the influencing factors: initial concentration of PFOA (10 mg L−1 to 200 mg L−1), current density (1 mA cm−2 to 40 mA cm−2), initial pH value (3 to 11) and electrode distance (5 mm to 20 mm). After a 150 min electrolysis, the optimum reaction conditions were obtained and the degradation and defluorination ratios reached 95.11 ± 3.9% and 75.7 ± 2.8%, respectively. Under the optimum conditions, the degradation of PFOA followed pseudo-first-order kinetics (0.0193 min−1) and the degradation half-life was 35.9 min. The produced F− was measured using a fluoride ion selective electrode, whereas the intermediate PFCAs with short-chain lengths were measured using HPLC-MS. A detailed degradation pathway was proposed in this study by analyzing the intermediates and the recovery of fluoride.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Haiyan Song,Jiang-An You,Bin Li,Chunxia Chen,Jie Huang,Jin Zhang
Novel titanosilicate composites with bimodal mesopores using molecular sieves Ti-HMS and Ti-KIL-2 as structural components were successfully synthesized by two-step and dual-template methods in a comparative study. The as-synthesized Ti-HMS/KIL-2 samples were characterized by a series of techniques including X-ray diffraction, UV–vis, N 2 sorption and scanning electronic microscopy, and their performance was tested in adsorptive denitrogenation for model fuel containing pyridine or quinoline. Although Ti-HMS/KIL-2 composites were constructed following the different pathway of self-assembly, most of them obtained coexisting properties and structures of Ti-HMS and Ti-KIL-2, as well as the intact framework Ti in tetrahedral coordination. A key finding is that the mesopores size of Ti-KIL-2 component in the composite can be regulated via the introduction of Ti-HMS precursor or organic template dodecylamine. Especially, the composites of dual-template method presented hierarchical mesopores with obvious bimodal distribution. In addition to constructing the hierarchical structure, introduction of Ti-HMS into Ti-KIL-2 matrix improved the adsorptive denitrogenation performance, which was influenced by the synthetic strategy of Ti-HMS/KIL-2. The target adsorbates achieved the best match with the adjustable pores of Ti-HMS/KIL-2. Therefore, (0.6 D )Ti-HMS/KIL-2 and (0.5 T )Ti-HMS/KIL-2 as the optimized adsorbents obtained remarkable adsorption efficiency respectively for pyridine and quinoline. Essence of the adsorptive denitrogenation process was revealed via the adsorption isotherms and the adsorption thermodynamics. Finally, Ti-HMS/KIL-2 composites achieved the improvement in hydrothermal stability and recyclability during adsorption of pyridine and quinoline, and exhibited the potential of industrial application.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2016
·Vol. 92
·期 4
·827-833
·
IF 2.738
Jinxi Feng,Shenyu Lan,Chunyang Yao,Ya Xiong,Shuanghong Tian
BACKGROUND Electro-generation of NaOH and H 2 SO 4 with organic compound-free Na 2 SO 4 wastewater has been known for many years, but actually, lots of Na 2 SO 4 wastewater contains organic pollutants, such as black liquor, dyeing and sulphonating wastewater etc., therefore, there is a strong demand for investigations on performance and effect of the organic pollutants in electrochemically splitting Na 2 SO 4 into H 2 SO 4 and NaOH from these wastewaters. RESULTS Co-electrolysis of Na 2 SO4 (1.13 mol L −1 ) and AO7 (50 ∼ 500 mg L −1 ) was investigated in a diaphragm cell with IrO 2 -coated Ti electrodes. It was found that the concentrations of the resulting NaOH and H 2 SO 4 could remain at about 0.73 mol L −1 and 0.36 mol L −1 , respectively, although the COD removal was increased from 50.3 mg L −1 to 166.3 mg L −1 with the increase of AO7 concentration, for 120 min. CONCLUSION In a diaphragm cell with IrO 2 -coated Ti electrodes, NaOH and H 2 SO 4 could be effectively generated, and simultaneously, AO7 could also be degraded for the wastewater containing Na 2 SO 4 and AO7. Interestingly, the electro-generation of NaOH and H 2 SO 4 was not significantly affected by the occurrence and degradation of AO7 in the range 0–500 mg L −1 . The phenomenon of constant acid–base yield contributed to the independence of the main acid-generating reactions on the electro-oxidation of AO7. © 2016 Society of Chemical Industry
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bingbing Cui,Guodong Fu
Given that heterojunction engineering is an effective method for improving the separation efficiency of photoexcited electrons in WO 3 -based photochromic systems, a series of solid-state photochromic Zr/Ti-MOF@WO 3 heterojunctions prepared via a facile hydrothermal strategy, where Zr/Ti-MOF with photosensitivity and chemical stability was selected as template to load WO 3 . Zr/Ti-MOF@WO 3 heterojunctions were verified as nanoparticles filled with thin layer structure and WO 3 was diffused into the Zr/Ti-MOF planar. The appropriate conductive band energies facilitate the transport of photostimulated electrons from Zr/Ti-MOF to WO 3 , resulting in a fast photresponse in color changes (it only takes 1 s). In addition, a carrier for information storage and data dynamic encryption was developed on the basis of the photochromic Zr/Ti-MOF@WO 3 heterojunctions. This work presents a promising way to improve the electron/holes separation efficiency by constructing unique heterojunctions and further explore novel WO 3 -based photochromic systems and broaden their applications in rewritable media and data security.
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