CHEMOSPHERE
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2020
·
IF 5.778
Hang Liu,Hua Yin,Shaoyu Tang,Hui Peng,Xiaolong Yu,Guining Lu,Zhi Dang
In this work, the prepared mesoporous TiO 2 was employed to eliminate the environmental risk induced by the combined pollution (tris-(2-chloroisopropyl) phosphate (TCPP) and Cd 2+ ). The prepared material was characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (UV-DRS), Raman imaging spectrometer (Raman), N 2 adsorption/desorption isotherm and X-ray photoelectron spectroscopy (XPS). In the combined pollution system, the prepared TiO 2 simultaneously exhibited a higher adsorption and photocatalytic activity for Cd 2+ and TCPP at neutral condition, respectively. The adsorption of Cd 2+ and photo-degradation of TCPP by mesoporous TiO 2 followed pseudo-second-order and pseudo-first-order kinetics model, respectively. The removal efficiency of TCPP was improved from 67% to 100% when the concentration of co-existed Cd 2+ increased from 0.5 mg L −1 to 2 mg L −1 , due to the fact that the adsorbed Cd 2+ on the surface of TiO 2 scavenged electron and thus inhibited the photo-generated electron-hole pairs recombination. In addition, six degradation intermediates were determined by high resolution mass spectrum (HRMS) and potential transformation pathways of TCPP under the co-existence of Cd 2+ were proposed. The results suggested that rapid and high-efficient simultaneous removal of Cd 2+ and TCPP was feasible, which laid the basis for the remediation of other combined pollution in the future.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xue Wang,Mengjia Li,Shuang Yang,Jiajia Shan
An electrochemical sensing platform based on TiO 2 –Ti 3 C 2 T X nanohybrid, hexadecyl trimethyl ammonium bromide (CTAB) and chitosan (CS) modified glassy carbon electrode (GCE) has been developed for the detection of nitrite. The TiO 2 –Ti 3 C 2 T X nanohybrid was synthesized by a two-step calcination process. The nanohybrid and its preparation process were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical methods were used to characterize and investigate the electrochemical behavior and nitrite response of TiO 2 –Ti 3 C 2 T X /CTAB/CS/GCE. Under optimized conditions, the prepared TiO 2 –Ti 3 C 2 T X /CTAB/CS/GCE electrode displayed two linear ranges from 0.003 to 0.25 mM and 0.25 to 1.25 mM with a detection limit of 0.85 μM. Furthermore, the practical applicability of the electrochemical sensor was validated by the detection of nitrite in water and milk samples with good recovery.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Gongrui Wang,Yapeng Li,Yi Liu,Shuhong Jiao,Bo Peng,Jie Li,Lai Yu,Genqiang Zhang
Energy storage devices beyond lithium, including sodium/potassium ion batteries and hybrid capacities have recently attracted increasing attention due to their particular merit of cost-effectiveness. Currently, there is a common challenging issue in these devices, which is the rapid capacity fading of anodes due to the much larger ionic radius and sluggish kinetics of Na + /K + intercalation. Herein, we presented the formation of hierarchical nest-like TiO 2 -nitrogen-doped carbon hybrid nanostructures (denoted as TiO 2 /NC-HN) through the supramolecular assembly directed one-pot strategy, which exhibits outstanding electrochemical performance for both sodium and potassium ion storage with largely improved specific capacity and cycling stability. Specifically, it can deliver a high specific capacity of 382.5 and 323.1 mAh g −1 at the rate of 100 mA g −1 for Na + and K + storage, respectively, and can also maintain ultra-stable cycling capability under high rates. More importantly, the potassium ion hybrid capacitors based on TiO 2 /NC-HN anode can deliver a high energy/power density of 108.6 Wh kg −1 95 W kg −1 and exhibit superior cycling stability up to 30,000 cycles at the rate of 2.5 A g −1 . This work could not only provide a low-cost strategy for advanced hybrid nanostructures, but also benefit the development of energy storage devices based on earth-abundant sodium/potassium.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Dong Liu,Huijun Li,Ranpeng Gao,Qian Zhao,Zhongzhi Yang,Xia Gao,Zhe Wang,Fengquan Zhang,Weidong Wu
Elimination of antibiotics such as tetracycline hydrochloride (TC) from wastewater is of great significance, but still faces challenges. Herein, for the first time, I and P co-doped TiO 2 catalysts were prepared via a hydrolysis method. We also reported a simple method to prepare I and P co-doped TiO 2 photoelectrodes, which exhibited preeminent photoelectrocatalytic (PEC) performance for the decomposition of TC. The synergistic effect of I and P co-doping could significantly improve the charge separation rate and enhance the light absorption capacity of TiO 2 , leading to an enhancement of PEC activity. The main factors affecting the PEC performance were investigated, and the highest degradation rate constant (4.20 × 10 −2 min −1 ) was achieved when the doping content of P was 4 at% (ITP-4 photoelectrode) at pH 11.02 under visible light. The Langmuir–Hinshelwood kinetic model and active species trapping experiments were selected to investigate the degradation mechanism of TC. The results suggest that the hydroxyl radicals and photogenerated holes were the main active species that were responsible for the decomposition of TC. Moreover, the degradation pathways of TC based on the intermediates also demonstrated that the hydroxyl radicals and holes showed a principal role in degrading TC.
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高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
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2020
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IF 5.627
Fuchang Gao,Zuwei Xu,Haibo Zhao
In this paper, flame spray pyrolysis (FSP) is used to synthesize Pt/TiO 2 catalysts with surface-supported isolated Pt atoms through elaborate precursor/solvent formulation and flame temperature history control. It is a pivotal factor to this FSP process that there is a major distinction on saturated vapor pressure between two components (Pt species and Ti species), and thereby they exist as gas phase and particle phase at a certain temperature range, respectively. When the flame is quenched to ambient temperature with cold sheath gas , Pt species of gaseous PtO 2 (being in the vapor phase above 723 K) condense into deposition state on the surface of TiO 2 nanoparticles . Combined with X-ray photoelectron spectroscopy (XPS) analysis and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) detection, we identify that Pt atoms are dispersed and anchored on the catalyst surface . Single-atom Pt dispersed Pt/TiO 2 catalysts can be well achieved by controlling the loading at a very low level, which offers an effective way to maximize the atom economy for surface catalysis of scarce noble metals. In this work, considering that Pt as the best co-catalyst of hydrogen evolution, the FSP-made Pt/TiO 2 catalysts are tested in a photocatalysis water splitting system aiming to a simple and attractive means of renewable hydrogen production . The highest activity presents in 0.1Pt/TiO 2 with 0.1% molar ratio of Pt to Ti, reaching 108.5 times of the benchmark sample from commercial flame-made TiO 2 (P25). The high activity is attributed to the fact that the isolated Pt atom serves as the main active site for photocatalysis hydrogen evolution. Therefore, the performance and cost efficiency of catalysts are greatly improved by the FSP, mainly ascribed to engineering atomically dispersing Pt on the support surface.
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RSC Advances
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2020
·Vol. 10
·期 70
·43193-43203
·
IF 3.119
Jianing Li,Junzhong Wang,Juming Liu,Yan Li,Huiyan Ma,Jucai Yang,Qiancheng Zhang
Nano-TiO2 is a type of environment-friendly and inexpensive substance that could be used for photocatalytic degradation processes. In this study, the multi-type carbon species doped and modified anatase nano-TiO2 was innovatively synthesized and developed to overcome the deficiency of common nano-TiO2 photocatalysts. The multi-type carbon species were derived from tetrabutyl titanate and ethanol as the internal and external carbon sources, respectively. Meanwhile, diverse characterization methods were applied to investigate the morphology and surface properties of the photocatalyst. Finally, the visible-light photocatalytic degradation activity of the collected samples was evaluated by using methyl orange as a model pollutant. The promotion mechanism of multi-type carbon species in the photocatalytic process was also discussed and reported. The results in this work show that the doping and modification of multi-type carbon species successfully narrows the bandgap of nano-TiO2 to expand the light absorption range, reduces the valence band position to improve the oxidation ability of photogenerated holes, and promotes the separation of photogenerated charge carriers to improve quantum efficiency. In addition, the further modification of the external carbon source can promote the surface adsorption of MO and stabilize the multi-type carbon species on the surface of nano-TiO2.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Zhiqiang Liu,Jiang Wu,Jianmin Wang,Run Wang,Guolong Liu,Yongfeng Qi,Weixin Xu,Guangqian Luo,Minghou Xu
The morphology of the catalyst is one of the important factors affecting the photocatalytic activity. In this work, fluoride-mediated TiO 2 with different morphologies was successfully prepared based on Ostwald ripening. In particular, the morphology and structure of the TiO 2 sample can be adjusted according to different ionic environments. Combining experiments and characterization, the regulation mechanism of different fluorides on the morphology and structure of TiO 2 was proposed, and the transport behavior of photogenerated carriers was evaluated. The results show that the morphology and structure have a greater impact on the photocatalytic activity of TiO 2 . The hollow structure can promote the separation and transfer of carrier and enhance the light collection ability. The surface fluoride as an electron trap can reduce the carrier recombination rate, which is beneficial to the photocatalytic activity of the as-prepared sample. The hollow structure sample shows a good photocatalytic efficiency in the photocatalytic removal of Hg 0 in the gas phase, reaching about twice the commercial P25. Finally, the photocatalytic mechanism of the catalyst and the electron-hole migration path are proposed. This research provides new ideas for the design of hollow TiO 2 microspheres, which can be widely used in the field of catalysis.
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Zhaowei Liu,Kang Zhao,Guoxin Xing,Wanxing Zheng,Yufei Tang
Piezo-photocatalysis materials that can effectively utilize mechanical energy of water flow have become one of the research focuses in the field of water pollutant treatment. Herein, the unique thorn-like BaTiO 3 –TiO 2 composite nanofibers were prepared in one step by coaxial electrospinning. The surface TiO 2 nanorods and the core BaTiO 3 nanofiber presented a certain angle when the advancing speed ratio of the shell and core solution was 2:1. The TiO 2 nanorods were tightly bonded to the nanofiber and the thorn-like protrusions on the fiber surface were sensitive to water flow. The BaTiO 3 –TiO 2 composite nanofibers exhibited excellent photocatalytic performance and recyclability with the bandgap value of 3.12 eV. The photocatalytic degradation rate of BaTiO 3 –TiO 2 composite nanofibers was 99.8% under the vibration of tiny water current, while the degradation rate was just 56.1% without vibration. Scavenger study result indicated that superoxide radicals and hydroxyl radicals were the main factors to improve the photodegradation activity of the samples. After five cycles, the degradation rate still reached 98.6%. The obtained thorn-like BaTiO 3 –TiO 2 composite nanofibers can effectively utilize the tiny water vibration energy and have broad application prospects in the field of water treatment. Most importantly, the method of synthesizing a unique thorn-like structure is universal.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xubin Qian,Lei Xu,Yunqing Zhu,Haiying Yu,Junfeng Niu
Removal of triclosan (TCS) in water has attracted increasing attention due to its high detection frequency and potential toxicity. In this study, porous TiO 2 nanotube arrays (TiO 2 NTA) was prepared as the reactive electrochemical membrane (REM) to adsorb aqueous TCS, and subsequently to degrade TCS in-situ (a regeneration process of TiO 2 NTA). Adsorption kinetics and thermodynamic of TCS followed pseudo-second-order model and Langmuir model, respectively. Compared with adsorption at 0 mL min −1 (static adsorption), the initial adsorption rate and the maximum adsorption capacity increased 18.8-fold and 73.8-fold at 300 mL min −1 , respectively. The optimal equilibrium absorption capacity (per projected area of TiO 2 NTA) and the initial adsorption rate were 2042.92 mg m −2 and 108.51 mg m −2 min −1 , respectively. In the subsequently electrochemical oxidation process, 99.8% of the adsorbed TCS was degraded in-situ and TiO 2 NTA was regenerated simultaneously. TiO 2 NTA electrode maintained the stable removal performance of TCS during four adsorption-degradation cycles. The adsorption process was a complex combination of the hydrophobic interaction and electrostatic interaction with/without applied voltage at different pH value. The electrochemical degradation pathways of TCS on TiO 2 NTA were hydroxylation, disproportionation, dichlorination and cleavage of ether bond under the attack of electrochemical generated OH and O 2 − . The flow-through sequential adsorption and electrochemical degradation (SAED) based on TiO 2 NTA REM were proved to be effective method to removal TCS in waters, especially for the water with low conductivity.
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Catalysts
·
2020
·Vol. 10
·期 10
·1126
·
IF 3.52
Jun Liu,Xuli Li,Haobo Hou,Min Zhou
To further boost the charge separation and photocatalytic activity of TiO2under visible light, the anatase–rutile mixed-phase nitrogen-doped (N-doped) TiO2nanoparticles were successfully synthesized through a facile one-step calcining procedure using TiN as raw materials. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of as-obtained N-doped TiO2were characterized by the corresponding analytical techniques. The photocatalytic activities of as-fabricated samples were evaluated by degrading 4-chlorophenol (4-CP) and methylene blue (MB) aqueous solution under visible light irradiation. The results revealed that the ratio of rutile to anatase increased with the improvement of sintering temperature, and the sample prepared at 500 °C had the best photocatalytic activity. This might be because it possessed the most appropriate rutile/anatase proportion as well as the nitrogen doping. The transient photocurrent responses, photoluminescence spectra (PL) measurements, and active species trapping experiments were implemented to disclose the photocatalytic mechanism. This work will provide a further insight into the synthesis of highly efficient N-doped TiO2photocatalysts for organic contaminant removal.Keywords:N-doped TiO2;charge separation;photocatalytic activity
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Congcong Liu,Haijun Su,Chenyang Wei,Keyu Xie,Hongqiang Wang,Peng Zhai,Min Guo,Jun Zhang,Lin Liu
A high-quality TiO 2 electron transport layer (ETL) should possess a good energy-level alignment, perfect electron mobility, and excellent charge extraction efficiency. Nevertheless, the poor conductivity of amorphous TiO 2 film from low-temperature preparation is an inherent problem while the high-crystallined TiO 2 after high-temperature sintering (>450 °C) limits its application in the low-cost fabrication and flexible substrates. Here, we develop a low-temperature approach to in situ functionalize TiO 2 nanocrystals with dopamine molecules (DA-TiO 2 NCs) in the synthesis of the nanocrystals through a non-aqueous sol-gel method. We systematically investigate the tunable electronic properties of TiO 2 NCs with the variable DA modification and confirm that DA-TiO 2 can tailor the energy level alignment as well as increase the charge-extraction capacity, substantially reducing charge accumulation between the TiO 2 and perovskite layer. The in situ anchored amino groups (-NH 3 + ) not only preferentially boost the in-plane growth of perovskite grains but also induce the red-shift absorption of perovskite via the strong electrostatic interaction with Br − ions. Based on the DA-TiO 2 NCs ETLs, the power conversion efficiency of the fully ambient-processed planar FA x MA 1-x PbBr y I 3-y PSCs is optimized to 19.45%.
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危险品化学品经营许可证（带存储）