CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lishun Yang,Fukang Chen,Dezhao Meng,Qin Li,Meng Qi,Xinyu Chen,Kun Yu,Quan Li,Jingang Yang,Chunlin Song,Gang Liu,Lixue Zhang,Li Jin,Yan Yan
In this study, the viscous polymer processing (VPP) technique is implemented to optimize the characteristics of bulk (1- x )BaTiO 3 - x Bi(Mg 0·5 Ti 0.5 )O 3 (BT- x BMT) lead-free relaxor ferroelectric ceramics , with a focus on enhancing the recoverable energy storage density ( W rec ), improving breakdown strength resistance ( E b ), and increasing storage efficiency ( η ). The influence of polyvinyl alcohol (PVA) inclusion in the VPP process on the resulting dielectric ceramics is thoroughly investigated, covering rheological, dielectric, and ferroelectric properties . The results reveal that a gradual increase in PVA quantity during the VPP process effectively improves the density of ceramic blanks. However, an excess of PVA leads to void formation in the ceramic blanks post-debinding, hindering the achievement of a dense structure in the final ceramics and causing performance degradation. The resulting BT-0.405BMT-40 wt% PVA ceramic showed excellent storage performance, with W rec , η , and E b of 6.55 J/cm 3 81.45 %, and 480 kV/cm, respectively. In comparison to bulk BT-0.405BMT ceramics, there is a notable 2.47-fold increase in W rec and a 1.92-fold increase in E b , accompanied by a substantial improvement in η . Moreover, the BT-BMT-40 wt% PVA ceramic exhibits favorable temperature stability (30–150 °C), frequency stability (1–50 Hz), and commendable charge/discharge performance.
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MOLECULES
·
2024
·Vol. 29
·期 3
·659
·
IF 4.2
Zedian Li,Liangrui Xiang,Shijia Pan,Dahai Zhu,Shen Li,He Guo
This research constructed a novel O3/CaO2/HCO3−system to degrade antibiotic oxytetracycline (OTC) in water. The results indicated that CaO2andHCO3−addition could promote OTC degradation in an O3system. There is an optimal dosage of CaO2(0.05 g/L) andHCO3−(2.25 mmol/L) that promotes OTC degradation. After 30 min of treatment, approximately 91.5% of the OTC molecules were eliminated in the O3/CaO2/HCO3−system. A higher O3concentration, alkaline condition, and lower OTC concentration were conducive to OTC decomposition. Active substances including ·OH,1O2,·O2−, and ·HCO3−play certain roles in OTC degradation. The production of ·OH followed the order: O3/CaO2/HCO3−> O3/CaO2> O3. Compared to the sole O3system, TOC and COD were easier to remove in the O3/CaO2/HCO3−system. Based on DFT and LC-MS, active species dominant in the degradation pathways of OTC were proposed. Then, an evaluation of the toxic changes in intermediates during OTC degradation was carried out. The feasibility of O3/CaO2/HCO3−for the treatment of other substances, such as bisphenol A, tetracycline, and actual wastewater, was investigated. Finally, the energy efficiency of the O3/CaO2/HCO3−system was calculated and compared with other mainstream processes of OTC degradation. The O3/CaO2/HCO3−system may be considered as an efficient and economical approach for antibiotic destruction.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Hui Wang,Yan Xiang,Wei Liu,Jiyang Li,Nanwen Zhu,Ziyang Lou
Low-molecular-weight dissolved organic nitrogen (LMW-DON) is an emerging issue in concentrated leachate (CL). Ozonation is crucial to remove LMW-DON, but selectivity mechanisms of different reactive oxygen species were unknown. Here, reactions of O 3 and • OH with LMW-DON at different dosages were determined from composition, unsaturation/redox potential, and precursor-product relationship. The molecular weight of LMW-DON in CL presented a normal distribution and 76.5% was below 450 Da. LMW-DON with 400–1000 Da increased to 55.6%–66.7% and O/C wa increased by over 40.0% due to electrophilic substitution of O 3 . LMW-DON with <400 Da and 550–1000 Da were preferentially degraded by • OH at the low and high O 3 dosage, respectively. O 3 preferred to remove lipid-like (69.1%), protein-like (58.2%), and amino sugars-like (72.8%) LMW-DON, whereas • OH preferred to the refractory LMW-DON, such as carbohydrates-like (71.1%), lignin-like (49.6%), and tannins-like (72.5%) LMW-DON. Forty-three transformation reactions were quantified using mass difference analysis, and O 3 preferred to oxygen addition (e.g., +2O) and conversed amino to nitro groups, and saturated LMW-DON increased via unsaturated bonds rupture. • OH attacked the carbon groups (e.g., –CH 2 ) and nitrogen groups (e.g., –NH 3 +O, –NO 2 +H). These findings provide molecular evidence for the selectivity of oxidants with LMW-DON and improve the ozonation application in wastewater treatment .
研究领域:
环境科学
·
化学工程
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Feng Si,Bin Tang,Zixuan Fang,Hao Li,Shuren Zhang
Novel lead-free ceramics of (1- x )BaTiO 3 - x Bi(Mg 1/2 Sn 1/2 )O 3 (abbreviated as (1- x )BT- x BMS, with x = 0–0.20) were fabricated through a solid-state reaction route. Introducing BMS into the BT host triggered a ferroelectric-to-relaxor phase transition, which yielded slim polarization-electric field ( P - E ) loops and enhanced energy-storage performances. The large recoverable energy density with 2.25 J/cm 3 and high energy efficiency of 94% were obtained simultaneously under 240 kV/cm with x = 0.12. Furthermore, the energy storage characteristics of the 0.88BT-0.12BMS ceramics exhibited good temperature stability in the range of −55–150 °C, and great frequency stability in the range of 10–1000 Hz. Meanwhile, by means of pulsed charging-discharging evaluation, the 0.88BT-0.12BMS ceramics displayed a fast discharge period of 73 ns and a large power density of 27.7 MW/cm 3 . The results indicate that the elaborately designed 0.88BT-0.12BNS ceramics have promising potential for high-power pulsed capacitor applications.
研究领域:
材料科学
·
电子工程
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IET Nanodielectrics
·
2019
·Vol. 2
·期 3
·103-108
·
IF 0
Jun-Wei Zha,Shi-Cong Yao,Yan Qiu,Ming-Sheng Zheng,Zhi-Min Dang
Polymer-based composites with ceramic fillers could combine the advantages of both, which can be potentially used in electrical and electronic technology. In this work, the barium titanate (BaTiO 3 ) nanofibres and the core–shell structured BaTiO 3 @Al 2 O 3 nanofibres with Al 2 O 3 insulation layer coated on the BaTiO 3 surface were both prepared via the electrospinning method. The appropriate incorporation of the ceramic nanofibres effectively improves the dielectric properties and energy density of the polymer. Moreover, the poly(vinylidene fluoride- co -hexafluoropropylene)-based composite films with the three-layer sandwich structure were fabricated to further promote the dielectric properties. The results show that the outer two layers with a higher content of BaTiO 3 nanofibres can make more contribution to the improved permittivity of the composites. In addition, the introduction of the interlayer with low loading of BaTiO 3 @Al 2 O 3 nanofibres promotes the breakdown strength. This work gives rise to the potential in high energy storage applications.
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DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Qian Zhang,Si Chen,Zhi Huang,Yanying Liu,Jun-ming Hong
In this research, a novel insight was provided for oriented low-temperature S and N doping into graphene oxide (GO).Given the gradual concern in the high-temperature dependence of traditional annealing method for the oriented design of heteroatom doping, utilizing O 3 etching-assisted heteroatom doping can simultaneously resolve the problems of energy consumption and doping species design. In this research, with O 3 etching, 100 at.% marginal S (C-SO X -C) and 92 at.% graphitic N co-doped O 3 -S/NGO were successfully synthesized at annealing temperature of 200 °C. Characterization results showed that S and N doping via O 3 etching maintained the sheet-like structure of GO without much stacking (layer thickness of 4–5 nm). In addition, active defects were formed by O 3 etching and S/N atom doping to provide active center for catalytic reaction . The electrocatalytic degradation behavior proved that 100 % bisphenol A degradation efficiency could be achieved by O 3 -S/NGO within 30 min and that the main active species generated during the reaction were O 2 •− , 1 O 2 and active chlorine. The possible pathways of bisphenol A degradation were also determined to complete the discussion. This project was based on the environmental demand of organic pollution control and suggested an optimal preparation strategy for high-performance catalyst preparation and utilization.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 11
·3138-3152
·
IF 8.131
Weirui Chen,Hengxi He,Ruini Zou,Yidan Chen,Xukai Li,Jing Wang,Yiming Tang,Laisheng Li
In this study, CeOx with different exposed facets was prepared to investigate their potential effect on activating the peroxone reaction (H2O2/O3) and breaking through the restriction of solution pH on peroxone. By controlling the concentration of hydroxide, cube CeOx with a (100) facet, rod CeOx with a (110) facet and octahedron CeOx with a (111) facet were prepared by the hydrothermal precipitation method, and they all promoted heterogeneous peroxone for oxalic acid (OA) under acidic conditions. The catalytic activity of CeOx was highly related to their surface oxygen vacancies (OVs) and the interfacial electron transfer process. Both experiments and theoretical calculations showed that CeOx with different exposed facets activated peroxone in different ways and (111) CeOx possessed better activity than (100) or (110) CeOx. The low efficiencies of (100) and (110) CeOx were due to their inefficient use of H2O2 to reduce surface Ce4+ and their large energy gap to generate surface peroxide (OVs-OOH). (111) CeOx was stable with surface-adsorbed H2O2, and the rich electrons at OVs could be donated to H2O2 and generate OVs-OOH, which then triggered O3 decomposition into hydroxyl radical (˙OH) and superoxide radical (˙O2−). These electron migration processes depended on the electron-donating ability of the OVs rather than solution pH, therefore, still greater amounts of reactive species were generated under acidic conditions. The flexibility of the (111) CeOx/H2O2/O3 process was further investigated for removing 20 kinds of pharmaceuticals. The synergy effect of (111) CeOx/O3 and H2O2 varied with the structure of the pharmaceuticals.
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Polymers
·
2021
·Vol. 13
·期 2
·285
·
IF 4.329
Lingfei Li,Qiu Sun,Xiangqun Chen,Zhaohua Jiang,Yongjun Xu
The low dielectric constant of the nonpolar polymer poly(1-butene) (PB-1) limits its application as a diaphragm element in energy storage capacitors. In this work, Ba(Zr0.2Ti0.8)O3-coated multiwalled carbon nanotubes (BZT@MWCNTs) were first prepared by using the sol–gel hydrothermal method and then modified with polydopamine (PDA) via noncovalent polymerization. Finally, PB-1 matrix composite films filled with PDA-modified BZT@MWCNTs nanoparticles were fabricated through a solution-casting method. Results indicated that the PDA-modified BZT@MWCNTs had good dispersion and binding force in the PB-1 matrix. These characteristics improved the dielectric and energy storage performances of the films. Specifically, the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film exhibited the best dielectric performance. At 1 kHz, the dielectric constant of this film was 25.43, which was 12.7 times that of pure PB-1 films. Moreover, its dielectric loss was 0.0077. Furthermore, under the weak electric field of 210 MV·m−1, the highest energy density of the PDA-modified 10 vol% BZT@ 0.5 vol% MWCNTs/PB-1 composite film was 4.57 J·cm−3, which was over 3.5 times that of PB-1 film (≈1.3 J·cm−3at 388 MV·m−1).Keywords:sol–gel hydrothermal method;PDA-modified BZT@MWCNTs nanoparticles;dielectric performance;synergistic effect
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hang Xu,Mingjing Ge,Yin Liu,Chen Yao,Houzhen Zhou,Mingmei Ding,Yang Li
Singlet oxygen ( 1 O 2 ) is an electrophilic oxidant capable of selectively eliminating contaminants in complex wastewater, which is highly expected in environmental remediation. However, due to the limitations in synthesizing catalysts with well-defined adsorption and active sites, the efficient and selective generation of 1 O 2 remains challenging. Herein, isolated Ru-O 3 moiety decorated two-dimensional Ti 3 C 2 T x catalysts (Ru-SA/Ti 3 C 2 T x ) were prepared to regulate 1 O 2 generation via peroxymonosulfate (PMS) activation. The constructed catalysts with asymmetric dual-metal structures (Ti-O-Ru) exhibited surprising mass activity of 1.4 × 10 4 min −1 ·mol −1 with a high 1 O 2 generation selectivity of 98.3 %. Mechanism inquiry indicated that the enhanced adsorption and electron transfer between PMS and Ru-SA/Ti 3 C 2 T x attributed to the synergistic effect of the strong adsorption at the Ru sites and the rapid electron transfer in the asymmetric Ti-O-Ru structures. Theoretical calculations demonstrated that Ru-O 3 moiety decreased the formation energy barrier of key intermediate *O, thus converting to a 1 O 2 -dominated oxidation path. Two possible degradation pathways of tetracycline hydrochloride (TCH) were proposed by gas chromatography-mass spectrometry (GC–MS), and the toxicities of intermediates were significantly decreased due to the strong electrophilic attack of 1 O 2 . This study deepened the understanding of the specific contribution of individual sites in multi-site synergistic, which furnished implications for the design and optimization of Fenton-like catalysts.
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Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Geng Tang,Hong Yang,Bingqing Zhao,Dunying Wang,Fangfang Zeng,Qibin Liu
The rapid repair of bone defects remains a challenging clinical goal, with bio-piezoelectric composites emerging as promising materials due to their ability to replicate bone’s natural composition and electrical functionality. This study developed hydroxyapatite (HA)-based composites incorporating (Ba,Ca)(Ti,Sn)O3-based piezoceramics, achieving piezoelectric coefficients of 28.7 ± 2.48 pC/N, 11.1 ± 0.57 pC/N, and 5.7 ± 0.98 pC/N at HA mass fractions of 10%, 20%, and 30%, respectively, with a porosity around 20%. The composites were synthesized with a solid-state sintering method. The phase structure, surface morphology, and ferroelectric domain configuration of the composites were characterized. Electrical properties, compressive strengthen, hydrophilicity, in vitro bioactivity, biocompatibility and osteogenic ability were assessed. X-ray diffraction (XRD) analysis confirmed that all composites consisted of perovskite structure and HA phases. Microscopic observations revealed the (Ba,Ca)(Ti,Sn)O 3 -based piezoceramics particles embedded within the HA matrix. Evenly dispersed, irregular pores were formed, and pore size decreased as the HA content increased. The composite with 20 wt.% HA exhibited dense, small wedge-shaped domains and ferroelectric orthogonal (O) phase. Importantly, these composites demonstrated favorable compressive strength, surface wettability and biocompatibility, along with enhanced bioactivity and osteogenic differentiation ability in vitro , underscoring their potential in bone tissue engineering applications.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 10
·5875-5884
·
IF 10.7
Hui Guo,Yifeng Li,Lulu Jiang,Yenan Sha,Shihang Guo,Donglin Han
Proton conducting oxides are attracting increasing attention due to their promising application as electrolytes in solid-state electrochemical devices for energy conversion and chemical production, including protonic ceramic fuel cells, electrolyzers and membrane reactors. BaZrO3 and Ba(Zr,Ce)O3 substituted by acceptor dopants are currently the most promising proton conductors. In principle, replacing Zr or Ce with one kind of trivalent element (e.g., Y or Yb) can generate oxygen vacancies, which are necessary for the hydration reaction to introduce charge carriers of protons. However, it is commonly recognized that substituting Zr or Ce with Y and Yb simultaneously leads to high performance of the devices, but the reason is not clear. In this work, we studied the transport properties of four different compositional classes: BaZr0.8−xCexY0.2O3−δ (BZCY20), BaZr0.8Y0.2−xYbxO3−δ (BZYYb), BaZr0.1Ce0.7Y0.2−xYbxO3−δ (BZCYYb) and BaCe0.8Y0.2−xYbxO3−δ (BCYYb), at 600, 650 and 700 °C. For BZCY20, the ionic conductivity decreases on replacing Zr in BZY20 with x = 0.1 of Ce, increases with increasing Ce content within x = 0.1–0.5, and decreases on further increasing Ce content from x = 0.5 to 0.8. The ionic transport number increases with increasing Ce content. The ionic conductivity, partial conductivity of oxide ions and hole conductivity of BZCYYb and BCYYb increase with increasing Yb content. Since the increment of hole conductivity is larger, the ionic transport number decreases. For BZYYb, the ionic conductivity decreases and the hole conductivity increases with increasing Yb content, leading to decreasing ionic transport number. Both the high ionic conductivity and transport number are vital factors governing the performance of protonic ceramic cells (PCCs). Therefore, the improved performance of PCCs by adding both Y and Yb into the electrolyte cannot be explained from the viewpoint of electrical properties of the electrolytes. Thereby, we summarized our recent series of studies on the chemical compatibility between the electrolyte and NiO negatrode substrate, and suggested that the loss of dopant was suppressed by partly replacing Y with Yb. The high ionic conduction of the electrolyte can be maintained after co-sintering at high temperature to fabricate PCCs. This might be the real reason for the high performance of the devices using Y and Yb co-substituted electrolytes, prepared by the co-sintering method.
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Journal of Cleaner Production
·
2026
·
IF 10.7
Rui Hu,Hao-Tong Zheng,Boxi Tang,Jialing Tu,Yu-Hong Cui,Xuedong Zhai,Gang Wen,Zheng-Qian Liu
Effluent organic matter (EfOM) from municipal wastewater treatment plants is an emerging concern because of its refractory and potential risk to ecological environment. Herein, this investigation comprehensively evaluated the effects of HO • and O 3 exposures on EfOM transformation and micropollutant degradation under different pre-coagulation operating conditions during ozonation. Compared to coagulation and ozonation alone, coupling two processes could effectively reduce total organic carbon, color and UV 254 of effluent. Fe-based coagulant was easier to combine with OH − to generate floc in bulk than Al-based coagulant for EfOM capture, which could decrease total scavenging capacities of effluents as well as increase the exposures of O 3 and HO • during ozonation, enhancing ozonation efficiency for EfOM degradation. EfOM from membrane bioreactor treatment was more difficult to capture during pre-coagulation but more easily degraded during ozonation than that from conventional activated sludge treatment due to its lower molecular weight distribution and higher contents of humic-like and tryptophan-like substances. Parallel factor analysis shows that coagulation combined with ozonation breaks the fluorescent groups of humic-like and tryptophan-like substances effectively. Molecular weight distribution determination indicates that coupling two processes could more effectively remove humic-like substances, organic colloids and polysaccharides compared to coagulation or ozonation alone. Furthermore, micropollutants with higher energy of highest occupied molecular orbital were degraded more efficiently during ozonation. The investigation reveals that O 3 utilization efficiency for micropollutant degradation can be significantly improved by pre-coagulation, offering new ideas for reducing energy consumption during advanced ozonation treatment and ensuring the safety of effluent and sustainable water reuse.
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