JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yuxi Meng,Shaomian Liu,Yixi Wang,Wenqing Xu,Jiajian Gao,Sansan Yu,Fabing Su,Tingyu Zhu
Selective catalytic reduction of NO using CO (CO-SCR) is a promising technology for the purification of NO in the flue gas. However, the presence of O 2 significantly inhibits the activity of the CO-SCR catalyst. Herein, we synthesize a hollow Mn-doped CeO 2 @Co 3 O 4 catalyst (Mn-CeO 2 @Co 3 O 4 ), which achieved 82% NO conversion, 100% CO conversion, and 78% N 2 selectivity under 5 vol% O 2 at 200 °C, superior to those of CeO 2 @Co 3 O 4 and Co 3 O 4 @CeO 2 catalysts. The characterization results indicate that the strong electronic interaction at the heterointerfaces between Co 3 O 4 and CeO 2 plays a crucial role in promoting selective adsorption of NO. Furthermore, the Mn doping into the Co 3 O 4 lattice of the catalyst facilitates the conversion of N 2 O intermediates, thereby enhancing the overall activity. This research provides a new strategy for the design and synthesis of CO-SCR catalysts.
研究领域:
催化
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zhiqing Liang,Zhongying Liu,Xiuyuan Wei,Hui Wu,Chanjuan Liu,Xiaohua Huang
Bifunctionalized NH2-UiO-66-CF3 nanofillers were successfully prepared by grafting - CF3 on NH2-UiO-66 via aldehyde-amine condensation reaction and applied to the preparation of 6FDA-ODA/NH2-UiO-66-CF3 mixed matrix membranes (MMMs). The successful introduction of -NH2 and -CF3 groups was verified by FT-IR, XRD, and XPS characterization, and the integrity of the crystal structure was ensured. Due to the presence of hydrogen bonding, NH2-UiO-66-CF3 showed good interfacial compatibility with the polymer matrix. Due to the introduction of the - CF3 group, the MMMs exhibited excellent thermal stability (T10% > 500°C, Tg = 300°C–305°C), hydrophobicity (contact angle of 92.96–97.71), and mechanical properties (tensile strength of 74–85 MPa). The gas separation performance tests showed that the MMMs exhibited significantly improved gas permeability and selectivity compared to the pure 6FDA-ODA membranes, which was attributed to the fact that the -NH2 and -CF3 groups provided more adsorption sites for gases. In particular, the PI/NUF(10) MMMs showed the best performance, with permeabilities of 42.71, 9.22, and 92.79 Barrer for CO2, O2, and He, respectively, which were 248%, 213%, and 173% higher than those of the pure membranes. Meanwhile, the selectivities of CO2/N2, O2/N2 and He/N2 were improved by 37%, 24%, and 8%, respectively. Close to the Robeson upper limit, demonstrating excellent gas separation potential.
研究领域:
材料科学
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化学工程
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膜技术
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气体分离
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纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 10
·4424-4431
·
IF 9.931
Liming Qin,Ning Chen,Xin Zhou,Qinmin Pan
Self-healing is an effective strategy to improve the durability of a superhydrophobic surface, but a challenge remains in repairing its multi-scale structures and wettability simultaneously after damage. Here we report a self-healable superhydrophobic aerogel that spontaneously restores its superhydrophobicity, microstructure and macroscopic configuration simultaneously after physical or chemical damage. The superhydrophobic aerogel is fabricated by decorating an alginate-based aerogel with silver nanoparticles and octadecylamine (ODA). Once the aerogel is scratched or cut, it repairs both hierarchical structures and configuration integrity autonomously via wetting/heating processes, resulting in the recovery of superhydrophobicity and mechanical properties. Even after being etched with O2 plasma, it regains its superhydrophobic properties through a simple heat treatment. The robust healability is attributed to the dynamic catechol–Fe coordination as well as thermally induced rearrangement of ODA molecules. This concept of robust healability offers a new insight into the design of robust superhydrophobic surfaces aiming at various technological applications.
研究领域:
材料科学
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表面化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2021
·
IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
研究领域:
材料科学
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环境科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Lin Wang,Qiya Sun,Yicheng Dou,Zhipeng Zhang,Tingting Yan,Yongmei Li
A novel ternary recyclable Fe 3 O 4 /graphene/sulfur-doped g-C 3 N 4 (Fe 3 O 4 /GE/SCN) composite catalyst was synthesized and adopted in a visible-light driven catalytic system for the degradation of ranitidine, which is an important precursor of the emerging disinfection by-product of N-nitrosodimethylamine (NDMA). The addition of GE and Fe 3 O 4 significantly improved the interface charge transfer of SCN, increased the light collection efficiency and decreased the photogenerated charge recombination efficiency. Considering both the ranitidine removal efficiency and catalyst recovery, the Fe 3 O 4 mass fraction of 20% (20%-Fe 3 O 4 /GE/SCN) was recommended. Ranitidine (≤ 2 mg/L) was completely removed in 60 min under the conditions of an initial pH of 7.0 and a 20%-Fe 3 O 4 /GE/SCN dose of 1.0 g/L, and its degradation fitted well with the pseudo first-order kinetics model. Electron paramagnetic resonance analysis and trapping experiments confirmed that ·O 2 − , ·OH and h + participated in the degradation of ranitidine. Ranitidine was removed through the pathways of demethylation and hydroxylation based on the analysis of the detected degradation intermediates, and 57.3% of the NDMA formation potential (FP) was reduced after the reaction. The visible-light driven 20%-Fe 3 O 4 /GE/SCN catalytic technology is a promising method not only for the control of NDMA FP but also the catalyst could be recovered and reused.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHARMACEUTICAL RESEARCH
·
2019
·Vol. 36
·期 12
·1-10
·
IF 3.896
Li Songtao,Zhao Hongling,Mao Xiaoxia,Fan Yanfang,Liang Xiujun,Wang Ruxing,Xiao Lijun,Wang Jianping,Liu Qi,Zhao Guiqin
Purpose Transferrin receptors (TfRs) are overexpressed in tumor cells but are scarce in normal tissues, which makes TfR an attractive target for drug treatment of cancer. The objective of this study was to evaluate the potential of BP9a (CAHLHNRS) as a peptide vector for constructing TfR targeted peptide-drug conjugates and selective drug delivery. Methods Doxorubicin (DOX) was connected to BP9a via a disulfide-intercalating linker to afford a reduction-responsive BP9a-SS-DOX conjugate. By using HepG2 human liver cancer cells and L-O2 normal hepatic cells as TfR over-expressing and low-expressing in vitro models, respectively, TfR mediated cellular uptake of this conjugate was studied by using flow cytometry and confocal laser scanning microscopy. The in vitro cytotoxicities of the conjugate against HepG2 and L-O2 cells were examined by cell counting kit-8 (CCK-8) assay to evaluate its tumorous specificity. Results Cellular uptake and TfR blockage test results showed that the BP9a-SS-DOX conjugate gained entry into HepG2 cells via endocytosis mediated by TfR and mainly accumulated in cytoplasm. The in vitro antiproliferative activity of this conjugate against HepG2 cells (IC 50 6.21 ± 1.12 μM) was approximately one-sixth of that of free DOX (IC 50 1.03 ± 0.13 μM). However, its cytotoxic effect on L-O2 cells was obviously reduced compared with that of free DOX. Conclusions The BP9a-SS-DOX conjugate showed specific antiproliferative activity against HepG2 liver cancer cells. Our study suggests that BP9a has the potential to target chemotherapeutic agents to tumor cells over-expressing TfR and facilitate selective drug delivery.
研究领域:
药理学
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肿瘤学
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分子生物学
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药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL GEOLOGY
·
2021
·
IF 4.015
Hao Yu,Peng Zhang,Jiayu Liu,Yunsong Zheng,Nasiru Abba Mustapha
Oxygenation of siderite produces hydroxyl radicals (•OH) that are capable of transforming the pollutants. Yet, the influence of low-molecular-weight organic acids (LMWOAs)/ thiols (LMWOTs) which are widely occurring in soils and waters on •OH production from the oxygenation process of siderite is poorly understood. Results of this study show that the presence of LMWOAs/LMWOTs significantly facilitated •OH production from siderite oxidation by O 2 at pH 6–8. For instance, at pH 7, the cumulative •OH concentration within 24 h was only 1.3 μM for oxygenation of 1 g/L siderite, while it boosted to 19.7 and 7.2 μM, respectively, with the respective addition of 1 mM ethylenediaminotetraacetate and cysteine. The mechanisms responsible for the enhanced •OH production are associated with the complexation ability and redox activity of LMWOAs/LMWOTs. In the absence of LMWOAs/LMWOTs, •OH is mainly produced from the oxidation of adsorbed Fe(II) by O 2 , followed by the oxidation of structural Fe(II) on siderite surface. In the presence of LMWOAs, LMWOAs react with adsorbed Fe(II) and structural Fe(II) to produce complexed Fe(II). Therefore, the oxidation of LMWOAs complexed Fe(II) by O 2 predominantly contributed to •OH production. Although the complexation ability of LMWOTs is weaker than that of LMOWAs, LMWOTs can reduce O 2 to generate •O 2 − and H 2 O 2 , thus facilitating •OH production. Based on the proposed mechanisms, a kinetic model was developed to quantify the relative contribution of each pathway to •OH production. The addition of 1 mM citrate and cysteine in siderite suspension could increase the removal of trichloroethylene from <5% to 15% and 7%, respectively. Our study reveals the overlooked catalytic effects of LMWOAs/LMWOTs in enhancing •OH production from siderite oxidation by O 2 under redox-dynamic conditions.
研究领域:
环境科学
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化学
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污染控制
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Weijie Hua,Yong Kang
Due to the increasingly severe water contamination of antibiotics, high-efficient and green removal of antibiotics from aqueous solution is of great significance to environmental remediation and human health. The combined degradation of tetracycline hydrochloride (TCH) in water by pulsed discharge plasma on water surface (WSPDP) coupled with CaFe 2 O 4 /Bi 2 O 3 composite was investigated. The basic properties of the prepared CaFe 2 O 4 /Bi 2 O 3 composite were analyzed by XRD , SEM, TEM, PL and XPS, which indicated that the CaFe 2 O 4 /Bi 2 O 3 sample was synthesized successfully. Degradation performance revealed that there existed a synergistic effect in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system, and WSPDP could induce catalysis of CaFe 2 O 4 /Bi 2 O 3 composite. After adding 0.4 g/L 7 wt% CaFe 2 O 4 /Bi 2 O 3 sample to the WSPDP system, the degradation efficiency of TCH improved from 82.9% to 93.8%, and the kinetic constant enhanced from 0.0616 min −1 to 0.0953 min −1 after 30 min of discharge treatment. Furthermore, the effects of pulse peak voltage, pulse frequency, initial pH of solution and air flow rate on TCH degradation were evaluated. The highest TCH degradation efficiency of 97.8% could be obtained at the peak pulse voltage of 24.6 kV, pulse frequency of 50 Hz, initial pH of 3 and air flow rate of 2 L/min within 30 min. OH, h + and O 2 − were the main reactive radicals for TCH degradation in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system·H 2 O 2 and O 3 were also involved in TCH degradation of the synergistic system, and the addition of CaFe 2 O 4 /Bi 2 O 3 could significantly improve the utilization of H 2 O 2 and O 3 in the solution. The intermediates of TCH degradation were identified by liquid chromatography-mass spectrometry (LC-MS). Finally, the possible degradation pathways and synergistic degradation mechanism of TCH in the WSPDP + CaFe 2 O 4 /Bi 2 O 3 system were proposed.
研究领域:
环境科学
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水处理
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高级氧化过程
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催化
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污染物降解
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2023
·Vol. 9
·期 1
·70-81
·
IF 3.9
Yuxuan Shao,Dan You,Yuqi Wan,Qingrong Cheng,Zhiquan Pan
The activation capacity of molecular oxygen is an important indicator to evaluate the photocatalytic efficiency of a catalyst. In this paper, MoO3−x nanosheets with oxygen vacancies were deposited on WO3 nanoflowers to form a WOM heterojunction, which improved the photocatalytic performance and molecular oxygen activation ability of the catalyst. This novel WOM heterojunction exhibited excellent photoactivity for degrading rhodamine B (RhB), photocatalytic water splitting ability and molecular oxygen activation ability under sunlight irradiation. Among all the samples, WOM83% could degrade 98% of 30 ppm RhB in 40 min. Meanwhile, WOM83% exhibited the highest hydrogen generation rate (4214.2 μmol h−1 g−1) and the strongest TMB oxidation capacity, and can generate 2.23 μmol of ·O2− in 50 min. The enhanced photocatalytic performance via heterojunction construction may be attributed to these following reasons: (i) higher light absorption achieved by the MoO3−x and WO3 composite; (ii) the matched energy band gap of MoO3−x and WO3 led to higher photogenerated carrier mobility; (iii) MoO3−x with oxygen vacancies as electron traps suppressed the photogenerated carrier recombination; (iv) enhanced molecular oxygen activation ability of the WOM heterojunction, such as the production of ·O2−. The measurements for TMB photo-oxidation and ·O2− showed excellent molecular oxygen activation ability of WOM heterojunctions. Finally, a possible photocatalytic mechanism was proposed. This study provided a viable option for the application of materials with oxygen vacancies to remove pollutants and improve molecular oxygen activation ability.
研究领域:
材料科学
·
光催化
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 13
·e202303633
·
IF 1.9
Mingyan Chen,Wentao Wang,Xinkai Feng,Dehua Zhang,Yao Zhang,Yucheng Liu
Graphical This work describes the application of a highly efficient catalyst (NH 2 -UiO-66-Mo) to the catalytic oxidation desulfurization process. NH 2 -UiO-66-Mo can greatly improve the efficiency of oxidative desulfurization The optimum operating conditions of NH 2 -UiO-66-Mo are investigated through experiments, which prove the excellent performance of the catalyst, and the reaction mechanism is further studied through a series of characterizations. A highly efficient oxidative desulfurization composite catalyst NH 2 -Uio-66-Mo has been prepared and applied in the catalytic oxidative desulfurization. It was elucidated that Mo 6+ could increase the oxygen vacancies and active sites on the catalyst and increase the pore size of UiO-66. Meanwhile, the removal rate of dibenzothiophene (DBT) reached 99.2 % after 60 min under optimal conditions and remained above 90 % after 5 cycles, showing the composite catalyst's remarkable catalytic performance and satisfactory reusability NH 2 -UiO-66-Mo. In addition, kinetic studies revealed that the desulfurization process can present a pseudo-first-order kinetic process. The apparent activation energy was 10.6 kJ/mol. Finally, in combination with oxides, possible oxidation pathways were identified.
研究领域:
化学工程
·
材料科学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 31
·2404319
·
IF 27.4
Zongqiang Sun,Xiaodong Lin,Chutao Wang,Yanyan Tan,Wenjie Dou,Ajuan Hu,Jiaqing Cui,Jingmin Fan,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
Lithium–oxygen (Li–O 2 ) batteries, renowned for their high theoretical energy density, have garnered significant interest as prime candidates for future electric device development. However, their actual capacity is often unsatisfactory due to the passivation of active sites by solid-phase discharge products. Optimizing the growth and storage of these products is a crucial step in advancing Li–O 2 batteries. Here, a fluorine-doped bimetallic cobalt-nickel oxide (CoNiO 2– x F x /CC) with an interlaced catalytic surface (ICS) and a corncob-like structure is proposed as an oxygen electrode. Unlike conventional oxide electrodes with a “single adsorption catalytic mechanism,” the ICS of CoNiO 2− x F x /CC offers a “competitive adsorption catalytic mechanism,” where oxygen sites facilitate oxygen conversion while fluorine sites contribute to the growth of Li 2 O 2 . This results in a change in Li 2 O 2 morphology from a surface film to toroidal particles, effectively preventing the burial of active sites. Additionally, the unique open architecture aids in the capture and release of oxygen and the formation of well-contacted Li 2 O 2 /electrode interfaces, which benefits the complete decomposition of Li 2 O 2 products. Consequently, the Li–O 2 battery with a CoNiO 2− x F x /CC cathode demonstrates a high specific capacity of up to 30923 mAh g −1 and a lifespan exceeding 580 cycles, surpassing most reported metal oxide-based cathodes.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Mingjie Huang,Bingyuan Xu,Ke Feng,Wei Xiang,Xiaohui Wu,Yiliang Lv,Tao Zhou
Microscale zero valent iron (ZVI) is a promising material for in situ water purification through O 2 activation, but its activity is hindered by the slow electron transfer rate caused by the shielding effect of the surface passivation layer. Herein, we introduce a synergistic strategy that combines an inorganic ligand, i.e., tetrapolyphosphate (TPP), with magnetic field (MF) to boost the O 2 activation efficiency of ZVI under neutral conditions. This approach has resulted in a 4.7-fold increase in the degradation rate of diclofenac (DCF) compared to the MF-unassisted system and a remarkable 22.0-fold improvement over an analogous system with MF and EDTA. Multiphysics simulations, batch experiments, and characterizations revealed that the enhanced degradation rate was not only attributed to the elevated magnetic gradient on the ZVI surface to enrich the paramagnetic O 2 and Fe ions, but also to the functions of TPP to suppress the annihilation of •OH and reduce the redox potential of Fe 2+ /Fe 3+ . Furthermore, a synergistic mechanism between MF and TPP that facilitates the detachment of the surface-bound Fe 3+ -TPP complex into the aqueous phase, thereby regenerating the surface active sites was elucidated. This study underscores the potential of the MF-TPP synergy as an effective strategy to enhance ZVI-based Fenton-like catalysis for pollutant remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）