Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Liying Jiang,Pengju Wang,Yufen Zhang,Zhiwei Yao
Plasma-assisted catalytic oxidation of chlorinated volatile organic compounds (CVOCs) over Co-Mn/TiO 2 catalyst was performed in a dielectric barrier discharge (DBD) reactor having two segmented electrodes. The combination of DBD reactor with segmented electrodes and Co-Mn/TiO 2 catalyst remarkably enhanced the removal efficiency of chlorobenzene (CB) and selectivity of CO 2 . The segmented discharge reactor with Co-Mn/TiO 2 catalyst presented the best performance with 96.3 % of removal efficiency and 69.0 % of CO 2 selectivity at discharge voltage of 17 kV compared with the traditional plasma-only and other plasma-catalytic reactors. Results from discharge characteristics analysis showed that the addition of segmented electrodes and the catalysts could improve the plasma characteristics and greatly boost the specific energy density (SED) at the same voltage, resulting in the generation of more high-energy electrons and chemical active species which favor the oxidation of CB. Although the segmented electrodes facilitated the generation of O 3 , the Co-Mn/TiO 2 catalyst boosted the decomposition of O 3 to generate active oxygen species (O* and O 2 ). The synergistic effect of introducing segmented electrodes and the Co-Mn/TiO 2 catalyst into the DBD reactor at alternate voltages of 13 and 15 kV could promote the deep oxidation of intermediate products thereby bringing less effects on the catalyst surface, leading to a stable and high performance in CB removal. Furthermore, a plausible decomposition mechanism of CB destruction in the DBD reactor having segmented electrode over Co-Mn/TiO 2 catalyst was proposed according to the identification of gaseous intermediates based on GC-MS analysis.
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Journal of Environmental Sciences
·
2020
·
IF 4.302
Sijia Qian,Shengyan Pu,Ying Zhang,Peng Wang,Yingchen Bai,Bo Lai
TiO 2 /graphene oxide (GO) as photocatalyst in the photo-degradation of multitudinous pollutants has been extensively studied. But its low photocatalytic efficiency is attributed to the high band gap energy which lead to low light utilization. Cu-TiO 2 /GO was synthesized via the impregnation methods to enhance the catalytic performance. The Cu-TiO 2 /GO reaction rate constant for photo-degradation of pollutants (tetracycline hydrochloride, TC) was about 1.4 times that of TiO 2 /GO. In 90 min, the removal ratio of Cu-TiO 2 /GO for TC was 98%, and the maximum degradation ratio occurred at pH 5. After five cycles, the removal ratio of Cu-TiO 2 /GO still exceeded 98%. UV–visible adsorption spectra of Cu-TiO 2 /GO showed that its band gap was narrower than TiO 2 /GO. Electron paramagnetic resonance (EPR) spectra test illustrated the generation rate of •O 2 − and •OH was higher in Cu-TiO 2 /GO system than TiO 2 /GO and TiO 2 system. The contribution sequence of oxidative species was •O 2 − > holes (h + ) > •OH in both TiO 2 /GO and Cu-TiO 2 /GO system. Interestingly, the contribution of •OH in Cu-TiO 2 /GO was less than that in TiO 2 /GO during the photo-degradation process. This phenomenon was attributed to the better adsorption performance of Cu-TiO 2 /GO which could reduce the accessibility of TC to •OH in liquid. The enhanced non‑hydroxyl radical contribution could be attributed to that the more other active species or sites on (nearby) the surface of Cu-TiO 2 /GO generated after doping Cu. These results provide a new perspective for the tradition metal-doped conventional catalysts to enhance the removal of organic pollutants in the environment.
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CERAMICS INTERNATIONAL
·
2017
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IF 2.986
Hualin Jiang,Menglin Li,Jun Liu,Xueqin Li,Lei Tian,Pinghua Chen
In this study, a novel CeO 2 -TiO 2 nanocomposite denoted as CeO 2 -3TiO 2 was successfully synthesized via a facile one pot hydro-thermal method without alkali. It exhibits high photocatalytic reduction reactivity toward Cr(VI) under visible light. The photocatalytic reactivity of CeO 2 -3TiO 2 is 18 times higher than that of pure CeO 2 , 28 times higher than pure TiO 2 , 15 times higher than the sample of simply mixed CeO 2 and TiO 2 . The solution with Cr(VI) initial concentration of 2780 ppb can be fast photoreduced by CeO 2 -3TiO 2 in 60 min under visible light to meet the criterion of U.S. Environmental protection Agency. Characterization results indicate CeO 2 -3TiO 2 has the good crystal form of heterojunction structure, narrow pore size distribution , narrow energy gap and high photogenerated electron-hole separation efficiency. Based on the experimental results, a speculated photocatalytic mechanism was proposed.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Qianqian Li,Hairong Yue,Changjun Liu,Kui Ma,Shan Zhong,Bin Liang,Siyang Tang
Transformation from photocatalytic oxidative dehydrogenation of ethane (PODHE) to photocatalytic dehydrogenation of ethane (PDHE) is an attractive process. A series of Pd/TiO 2 photocatalysts with different Pd loading amount were synthesized by photochemical deposition. And the Pd particle sizes varied from 1 nm to 4 nm. PDHE happened instead of POHDE over Pd particles smaller than 3 nm. The best PDHE performance (H 2 , 799.4; C 2 H 4 , 614.9, in micromoles per gram of catalyst) was obtained over 0.5 wt.% Pd/TiO 2 catalyst. And it was 3 times of it of PODHE over 1 wt.% Pd/TiO 2 . Reducing the Pd particle size of Pd/TiO 2 would increase Pd 0 /Pd 2+ and lower the valence band and conductive band of Pd/TiO 2 , which affect the catalytic behaviors. Detailed formation of products was investigated in this work.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Nan Wang,Xing Li,Yanling Yang,Tingting Guo,Xiaoxuan Zhuang,Siyang Ji,Tingting Zhang,Yi Shang,Zhiwei Zhou
The antibiotic sulfamethazine (SMT) has emerged as a water pollutant that is recalcitrant to conventional water treatment process. A number of technologies based on hydroxyl radical or sulfate radical induced SMT degradation have been described, but photo-induced degradation is not widely examined. Herein, photocatalysts of Bi-doped TiO 2 nano-composites supported by powdered activated carbon (PAC) were prepared, with variable molar ratios of Bi/Ti (0.06:1(6%), 0.08:1(8%), 0.1:1(10%) and 0.12:1(12%)) by a sol-hydrothermal method. The ratio of 10% (Bi-Ti/PAC (10%)) was most efficient to degrade SMT. Experimental variables during photocatalytic degradation were optimized for solution pH, catalyst dosage, initial SMT concentration, and coexisted anions. Under optimal conditions of 1.0 g/L catalyst, 20 mg/L initial SMT concentration, pH 6.0 and visible light irradiation at 400–780 nm, the degradation rate reached 81.18% in 300 min. Compared to Bi-Ti(10%) nano-composite without PAC, pure TiO 2 or commercially available P 25 , Bi-Ti/PAC(10%) was superior for SMT degradation with a degradation kinetic rate of 0.00531 min −1 . The properties of the prepared photocatalysts were characterized by X-ray powder diffraction, scanning electron microscope, X-ray photo-electron spectroscopy, Brunauer-Emmett-Teller and ultraviolet-visible diffuse reflection spectroscopy. This revealed that Bi-Ti/PAC (10%) had a smaller crystal size, larger specific surface area, larger pore size, stronger visible light absorption ability and lower band gap energy than pure TiO 2 . Ten intermediates of SMT were identified and a possible degradation pathway was proposed.
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Frontiers in Chemistry
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2020
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IF 3.693
Wang Xiaodong,Hu Weizhao,Hu Yuan
In this study, h-BN@PDA@TiO2 hybrid nanoparticles were prepared and used as functional fillers to prepare PVA nanocomposites, and the effects of hybrid particles on PVA thermal conductivity and flame retardant properties were studied. The results showed that hybrid particles could significantly improve the thermal conductivity and flame retardant performance of PVA composites, and effectively inhibit the release of toxic gases such as combustible pyrolysis products and CO, which enhanced the fire safety of PVA composites. When the addition amount of hybrid particles is 5 wt%, the thermal conductivity of PVA composites is 239.1% higher than that of the pure PVA and the corresponding temperature of PVA composites with a mass loss of 5 wt% was 16.2°C higher than that of the pure PVA. This is due to the barrier effect of h-BN and the protective effect of dense carbon layer catalyzed by TiO2.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Taiguang Li,Mingyong Wang,Qingzheng Hou,Yaqi Hou,Kai Xuan,Yongmei Hao
One kind of novel magnetically separable graphene-based titanium dioxide photocatalytic nano-adsorbents (GO-FSNTs) were prepared for the adsorption-photodegradation of phenanthrene under visible light. The GO-FSNTs displayed the high adsorption-photodegradation efficiency and 10 mg of 0.6% GO-FSNT (wt%) can remove 94.9% of phenanthrene within 4 h. The introduction of a small amount of GO enables 0.6% GO-FSNT to selectively adsorb phenanthrene through the π-π interaction, reduce the light-shielding effect and improve separation of photogenerated carriers effectively. Meanwhile, the N-TiO 2 shell is occupied by adsorbed water molecules which can spontaneously repair lattice oxygen. Furthermore, the more hydrophilic surface of 0.6% GO-FSNT is formed by increased photoinduced hydroxyl groups under visible light during photodegradation. The photoinduced hydroxyl groups can further generate OH and improve photocatalytic activity. The degradation pathway of phenanthrene was proposed based on intermediates analysis and density functional theory calculations. This work helps to reveal the relationship between the adsorption-photodegradation and the photoinduced hydrophilicity.
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Advanced Healthcare Materials
·
2019
·Vol. 8
·期 9
·1801254
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IF 6.27
Yue He,Jingyuan Wan,Yang Yang,Pei Yuan,Cheng Yang,Zhigang Wang,Liangke Zhang
TiO 2 nanoparticles have emerged as satisfactory sonosensitizers in sonodynamic therapy over the years, but shortcomings such as poor drug loading capability and inadequate techniques to construct suitable TiO 2 nanoparticles, limit their broader applications. Hence, in this paper, versatile nanocomposites that combine mesoporous TiO 2 nanoparticles (mTiO 2 s) with the promising photothermal material, polypyrrole (PPY) to exert synergistic therapeutic effects on tumors are fabricated. The PPY-coated mesoporous TiO 2 nanocomposites (mTiO 2 @PPYs) act as drug delivery vehicles and ultrasonically activated sonosensitizers as well as photothermal agents. Besides, mTiO 2 @PPY may have potential as an ultrasound/photoacoustic (US/PA) imaging contrast agent. The mTiO 2 @PPY shows a favorable drug loading and good photothermal conversion ability. Moreover, intracellular reactive oxygen species generation is verified. The in vitro cell experiments on HepG2 and 4T1 cells demonstrate that honokiol (HNK)-loaded mTiO 2 @PPY has satisfactory cytotoxicity under laser and US irradiation, and the results are further validated by animal experiments. The ability of mTiO 2 @PPY as a contrast agent for US and PA imaging is investigated both in vitro and in vivo. The results indicate that mTiO 2 @PPY-HNK has multitherapeutic effects and bimodal imaging property, which shows great prospect as a novel nanosystem in antitumor applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Junyan Liu,Liting Xu,Xingwei Li
Supports play a key role in the performance of platinum-based catalysts. In this work, using NH 2 -MIL-125 as the precursor, mixed-phase TiO 2 coated by nitrogen-doped carbon (TiO 2 @NC) is successfully prepared, and used to support platinum (Pt/TiO 2 @NC) for methanol oxidation reaction. In 0.5 M H 2 SO 4 solution containing 0.5 M CH 3 OH, the area specific activity of Pt/TiO 2 @NC catalyst (1.186 mA cm -2 Pt) is 4.4 times that of commercial Pt/C (0.272 mA cm -2 Pt). At a fixed potential of 0.15 V (vs. Hg/Hg 2 SO 4 ), the current density of Pt/TiO 2 @NC is still 3.6 times that of Pt/C after 3600 s of polarization. Meanwhile, Pt/TiO 2 @NC has also a low tafel slope, a large exchange current density and a high charge transfer coefficient. A large number of Ti-OH groups can alleviate poisoning effect caused by the produced "CO ads " intermediate during methanol oxidation reaction. Nitrogen-doped carbon not only improves the conductivity of TiO 2 support, but provides strong anchor sites for the nucleation of Pt nanoparticles , resulting in an enhanced catalytic activity of Pt/TiO 2 @NC.
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JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zheng Meiru,Liu Ying,Qiao Peng,Wang Xueqin,Guo Xin,Zhang Mei,Zhang Jiaojing,Zhang Jianwei,Feng Fuping
Photocatalysis technologies for degrading organic pollutants have emerged as a promising strategy for environmental remediation. This study aimed to develop efficient photocatalysts by synthesizing TiO 2 -loaded composites derived from CuZnAl layered double hydroxides (LDHs) and assessed their performance in the decomposition of rhodamine B (RhB). CuZnAl-LDH nanosheets were synthesized via coprecipitation and then calcined at high temperatures to obtain CuZnAl layered double oxides (CZA-LDO). By varying the amount of ascorbic acid, the CuO in CZA-LDO was reduced to different extents, thereby varying the ratio of Cu, Cu 2 O and CuO. TiO 2 was then deposited on the surface. The morphology, crystal structure, bonding state, and photocatalytic performance of the composite materials were assessed. When exposed to UV light, the optimized TiO 2 /Cu–Cu 2 O–CuO–0.7 composite material achieved a degradation rate of 96.0% for RhB within 110 min, which was significantly better than TiO 2 /CZA-LDO (46.0%) and other Cu-modified samples (66.2%–77.9%). The enhanced photocatalytic properties of the prepared nanocomposite were ascribed to doping with Cu, Cu 2 O and CuO, which effectively enhanced the electron–hole pair separation efficiency. These findings demonstrate the potential of Cu-Cu 2 O-CuO-LDO-based photocatalysts as effective materials for degrading organic contaminants in environmental remediation. Graphical abstract
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International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 11
·2806-2813
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IF 7.2
Yu Zidong,Liu Xiaojuan,Liu Zhicheng,Liu Ye,Su Chao,Sun Zhi,Du Jilei,Wei Tao
Sodium-ion batteries (SIBs) have recently gained wildly interest due to the abundance of sodium, lower production costs, and better low-temperature performance compared to lithium-ion batteries (LIBs). Among various cathode materials of SIBs, O3-type NaNi 0.4 Fe 0.2 Mn 0.4 O 2 (NFM424) demonstrates high capacity and ease of synthesis, yet suffers from structural degradation and sluggish Na + kinetics caused by large ionic radius and strong electrostatic interactions. To overcome these issues, a configuration strategy combined with TiO 2 and Co 3 O 4 by a simple solid-state reaction method was introduced to improve structural and electrochemical stability. XRD, SEM, TEM, and various electrochemical characterizations as well as TGA/DSC tests were conducted. The resulting NaNi 0.4 Fe 0.2 Mn 0.3 Co 0.05 Ti 0.05 O 2 (NFMCT) cathode mitigated Jahn-Teller distortions and Na + /vacancy ordering while enhancing phase integrity and diffusion pathways. The obtained NFMCT maintained 93.7 mAh·g −1 after 550 cycles at 1 C, with superior rate capabilities at 2 C and 5 C. These findings deepen the understanding of configuration strategy by using multi-element oxide and highlight a practical strategy for designing high-performance SIB cathodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Maofeng Zhang,Haoran Sun,Xin Chen,Hongyang Zhou,Liangzhong Xiong,Wei Chen,Zihai Chen,Zhiyong Bao,Yucheng Wu
A sensitive solid semiconductor-based surface-enhanced Raman spectroscopy (SERS) substrate can realize recyclable and portable detection of organic pollutants. In this paper, TiO 2 nanosheets (NSs) on FTO glass substrate were synthesized by a simple and controllable hydrothermal method , followed by decoration of plasmonic Ag nanoparticles (AgNPs), and further deposition of graphene oxide (GO). The GO and AgNPs co-modified TiO 2 substrate showed improved signal reproducibility, longer-term stability, and higher detection sensitivity than that of TiO 2 counterparts. Note that, the optimized TiO 2 -Ag-GO substrate can also be utilized to discriminate multiple organic pollutants with a portable Raman instrument. The limit of detection (LOD) for crystal violet (CV), rhodamine 6 G (R6G) and malachite green (MG) was 10 −9 M, 10 −8 M, and 10 −7 M, respectively. Moreover, the solid substrate was applied to discern low concentrations of CV residue (10 −8 M) on crayfish’s shell and thiram residue (10 −6 M) on grape skin. As a proof of concept, multiplex detections were also demonstrated. More significantly, the better photocatalytic degradation performance of the TiO 2 -Ag-GO makes the solid substrate reuse for 10 cycles. The solid SERS substrate may have great potential for practical applications and resource-confined detections.
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