CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Lei Liu,Chunjiang Han,Guofang Ding,Meiying Yu,Yunfei Li,Shengnan Liu,Yunxuan Xie,Jia Liu
Bimetallic CuCo-doped graphene-like carbon nanosheets (CuCo@GCNs) were synthesized via a facile and efficient process using agarose as carbon templates to activate peroxymonosulfate (PMS) for tetracycline (TC) degradation. In this study, CuCo@GCNs/PMS system exhibited excellent TC removal efficiency (0.182 min −1 ), which was unaffected by various water matrices and applicable to a wide pH range (3.44–8.44). Radicals (SO 4 •− , • OH, and O 2 •− ) and non-radical ( 1 O 2 ) pathways collectively contributed to catalytic TC oxidation based on quenching experiments and electron paramagnetic resonance (EPR) analysis. Density functional theory (DFT) calculations revealed that the mechanism of PMS molecules activated on the surface of CuCo@GCNs, in which CoO provided more catalytic sites while Cu 2 O further enhanced electron transfer. Moreover, the synergistic effect of CuCo bimetal could accelerate redox cycles of Cu + /Cu 2+ and Co 2+ /Co 3+ , inducing the generation of abundant oxygen vacancies (O V s), thus enhancing PMS activation performance. Three potential TC degradation pathways were proposed according to fifteen possible intermediates detected by liquid chromatography-mass spectrometry (LC-MS). In brief, this work provides an efficient CuCo@GCNs heterogeneous catalyst and a new insight into PMS activation, which extends the application of bimetallic materials for environmental remediation.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Sanying Hou,Hailong Hu,Qing Fu,Tiyang Xiao,Jin-Qi Xie,Siew-Hwa Chan,Mengjun He,Bin Miao,Lan Zhang
The use of biomass as a catalyst offers a cost-effective and efficient approach for various processes, including the activation of peroxymonosulfate (PMS) to degrade contaminants. In this study, we successfully obtained Fe and N co-doped graphene-like hierarchical porous structure carbon (Fe-N/BC) by using undaria pinnatifida (wakame) as the precursor. The Fe-N/BC catalyst was utilized to activate PMS and degrade tetracycline (TC). Characterization results demonstrated an even distribution of Fe and N on the surface of the porous structure carbon. Compared to BC@PMS and N/BC@PMS, the Fe-N/BC@PMS system exhibited excellent degradation performance, achieving an 83.9 % degradation of TC in just 5 min with an ultralow catalyst dosage (Ca = 0.05 g/L) and a high TC concentration (TC = 0.03 g/L). Furthermore, experiments on radicals quenching and electron paramagnetic resonance (EPR) analysis indicated that singlet oxygen ( 1 O 2 ), a non-radical species, was demonstrated as the primary reactive oxygen species (ROS). The degradation mechanical analysis suggested that zero-valent iron (Fe 0 ), pyridinic N, graphitic N, and Fe-N x in the Fe-N/BC were the reason for the high catalytic activity. Moreover, the degradation pathways of TC were suggested through the use of LC-MS. Additionally, the ECOSAR system was employed to assess the toxicity of the intermediate products. This study reveals the active site and its mechanism in Fe-N composite biocarbon catalysts, providing a new method for synthesizing algal biocarbon catalysts.
研究领域:
环境科学
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材料科学
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生物工程
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 51
·期 20
·8015-8027
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IF 4.569
Zongyu Zhang,Xiuling Xue,Xiaoyi Chen
A novel ternary dual Z-scheme 2D g-C3N4 nanosheet/Ag3PO4/α-Bi2O3 (CNN/AP/BO) photocatalyst was successfully synthesized by an in situ deposition and hydrothermal–calcination method. The coupling of AP and BO remarkably enhanced the photocatalytic tetracycline (TC) degradation under visible light illumination, with an optimal removal efficiency of 91.6% (60 min), which can be attributed to the extended visible-light absorption and increased specific surface area owing to the interfacial intimate coupling with well-matched energy band positions between semiconductors. The improved photocatalytic activity resulted from the abundant free radicals by the order of ˙O2− > h+ > ˙OH based on the electron spin resonance (ESR) and quenching experiment results. In addition, the possible mechanism of TC degradation over the ternary dual Z-scheme heterojunction CNN/AP/BO was proposed.
研究领域:
材料科学
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环境科学
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光催化
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产品关联
DOI
PubMed
高影响因子
International Journal of Nanomedicine
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2023
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IF 8
Yan Zhao,Huan Wang,Yang Yang,Wendan Jia,Tong Su,Yuxin Che,Yixin Feng,Xuemei Yuan,Xuelian Wang
Background Previously, we demonstrated the therapeutic efficacy of a human papillomavirus (HPV) vaccine, including HPV16 E7 peptide and CpG oligodeoxynucleotides (CpG ODN), against small TC-1 grafted tumors. Here, we developed an HPV16 E7 peptide and CpG ODN vaccine delivered using liposomes modified with DC-targeting mannose, Lip E7/CpG, and determined its anti-tumor effects and influence on systemic immune responses and the tumor microenvironment (TME) in a mouse large TC-1 grafted tumor model.Methods L-alpha-phosphatidyl choline (SPC), cholesterol (CHOL), 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy (polyethylene glycol-2000)] (DSPE-PEG-2000), 1,2-dioleoyl-3-trimethylammonium-propane chloride salt (DOTAP) and Mannose-PEG-DSPE, loaded with HPV16 E7 peptide and CpG ODN, were used to construct the Lip E7/CpG vaccine. The anti-tumor effects and potential mechanism of Lip E7/CpG were assessed by assays of tumor growth inhibition, immune cells, in vivo cytotoxic T lymphocyte (CTL) responses and cytokines, chemokines, CD31, Ki67 and p53 expression in the TME. In addition, toxicity of Lip E7/CpG to major organs was evaluated.Results Lip E7/CpG had a diameter of 122.21±8.37 nm and remained stable at 4°C for 7 days. Co-delivery of HPV16 E7 peptide and CpG ODN by liposomes exerted potent anti-tumor effects in large (tumor volume ≥200mm3) TC-1 grafted tumor-bearing mice with inhibition rates of 80% and 78% relative to the control and Free E7/CpG groups, respectively. Vaccination significantly increased numbers of CD4+ and CD8+ T cells, and IFN-γ-producing cells in spleens and tumors and enhanced HPV-specific CTL responses, while reducing numbers of inhibitory cells including myeloid-derived suppressor cells and macrophages. Expression of cytokines and chemokines was altered and formation of tumor blood vessels was reduced in the Lip E7/CpG group, indicating possible modulation of the immunosuppressive TME to promote anti-tumor responses. Lip E7/CpG did not cause morphological changes in major organs.Conclusion Lip E7/CpG induced anti-tumor effects by enhancing cellular immunity and improving tumor-associated immunosuppression. Mannose-modified liposomes are the promising vaccine delivery strategy for cancer immunotherapy.
研究领域:
免疫学
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肿瘤学
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药剂学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jin Chen,Jiayu Lei,Jie Yan,Yuzhao Ma,Xiaofeng Yang,Yanjun Li
The establishment of a surface plasmon resonance (SPR) effect and an internal electric field (IEF) has been recognized as an effective technique for optimizing pollutant treatment in aquatic environments. Herein, we synthesized a novel 2D/2D Pt@BiOBr/Bi 2 WO 6 S-scheme heterojunction that establishes robust interfacial connections to enhance electron transport through minimized pathways, while simultaneously increasing active site availability. Subsequently, noble metal Pt was employed to modify the BiOBr/Bi 2 WO 6 composite material, thereby inducing SPR and broadening the light absorption range. Impressively, the optimized Pt@BiOBr/Bi 2 WO 6 demonstrates a significantly enhanced degradation efficiency for organic pollutants, primarily due to the synergistic effects of SPR and IEF. The degradation rate of tetracycline hydrochloride (TC-HCL) through the ternary heterojunction 2-PBB can achieve 100 % within 30 min under 500 W of visible light irradiation, showcasing impressive cyclic stability. Furthermore, the developed photocatalyst also demonstrated remarkable degradation efficiency for organic dyes such as Rhodamine B (RhB) and methyl orange (MO). This work demonstrates an original approach to the fabrication of Pt-modified S-scheme heterojunction photocatalysts with high effectiveness.
研究领域:
环境科学
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光催化
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材料科学
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纳米技术
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水处理
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Xue Li,Wenting Liu,Jiaojiao Fang,Hengming Huang,Cheng Zhu,Yaru Ni,Liang Fang,Jiahui Kou,Chunhua Lu,Zhongzi Xu
The incorporation of multiple up-conversion (UC) materials into dual-layered UC films presents a promising strategy for achieving multi-peaks spectrum. Here, we developed dual-layered UC films containing triplet-triplet annihilation up-conversion luminescence (TTA-UCL) chromophores and NaYF 4 :Yb 3+ ,Tm 3+ nanoparticles to enable multi-peaks emissions at 340−360 and 390 nm in the transmission manner and 340, 360 and 400–440 nm in the reflection manner under irradiations of green and NIR light. The light absorption and emission behaviors from different film surfaces were studied clearly. Besides, TiO 2 and g-C 3 N 4 with different absorption spectra were chosen to verify the availability of the dual-layered films to tune emission spectra. When both green and NIR light were used simultaneously, TiO 2 and g-C 3 N 4 can degrade tetracycline (TC) by 2.14 and 1.77 times more than the cases where single light was used alone. The photocatalytic abilities of TiO 2 or g-C 3 N 4 can be further improved by the selective increase in NIR or green light power density due to their different absorption spectra. The dual-layered films containing TTA-UCL chromophores and NaYF 4 :Yb 3+ ,Tm 3+ nanoparticles provide a candidate framework for UC systems with tunable short-wavelength spectra to expand their applications in the fields of photocatalysis.
研究领域:
材料科学
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光催化
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纳米技术
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
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IF 11.2
Tingting Yu,Bing Yang,Rong Zhang,Chenyu Yang,Arramel,Jizhou Jiang
The upsurge of interest in the emergence of photocatalytic fuel cell systems (PFC) presents an efficient and environmentally friendly approach to wastewater treatment. In this work, a Z-scheme coupled with an S-scheme heterojunction electrode was used in the PFC, utilizing TiO 2 /GO/g-C 3 N 4 as the photoanode and BiOAc 1– x Br x /BiOBr as the photocathode. We systematically align the band structures between the anode and cathode, which facilitates the electron transfer between the electrodes. Our attempt successfully demonstrates that collaborative power generation facilitates the high efficiency of tetracycline hydrochloride (TC) degradation at both electrodes. The photoanode achieved a 94.87 % degradation rate for TC, while the photocathode exhibited a 96.33 % degradation rate after 2 h, surpassing pristine BiOBr and BiOAc by factors of ∼5.3 and ∼3.8, respectively. Furthermore, this work proposed a mechanism for electron generation, transport, and pollutant degradation mechanism in the PFC. Intermediate substances generated during the degradation of TC were analyzed through high-performance liquid chromatography-mass spectrometry (HPLC-MS) and ultraviolet photoelectron spectroscopy (UPS), while the optimal degradation pathway was confirmed using density functional theory (DFT). The findings of this work establish the feasibility of efficiently degrading pollutants through PFC treatment, introducing a novel system where various heterojunctions in bipolar materials collaborate with photocatalysis to effectively generate electricity and enhance pollutant removal.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Tongtong Zhang,Yuqi Wang,Xin Xie,Yanning Shao,Yuhao Zeng,Siyu Zhang,Qishe Yan,Zhongjun Li
A dual Z-scheme carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C 3 N 4 deposition on the surface of Bi 2 O 3 and BiOI and a higher charge transfer rate of carbon-bridged g-C 3 N 4 , which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C 3 N 4 and bismuth-based catalysts.
研究领域:
材料科学
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光催化
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Tian Sang,Yan Zhong,Chao-Hao Hu,Dian-Hui Wang,Tao Huang,Sheng Jiang,Hao Liu,Wen-Yi Wang,Ni-Ni Wei
A novel SrCu□O□ photocatalyst containing Cu vacancy and O vacancy was synthesized for the first time based on solid-phase sintering. The crystal structure, elemental composition, microscopic morphology, optical properties and energy band structure of the samples were characterized and analyzed in detail. The vacancies in the material were determined by ICP-MS and EPR, first-principles calculations showed that the introduction of vacancies extends the forbidden band of the photocatalytic to the visible band. The photocatalytic performance of SrCu□O□ was evaluated by degrading MB and TC HCI. Our results show that SrCu□O□ enhances the degradation performance of organic compounds due to rich vacancies that promote electron-hole pair separation and improve photogenerated carrier separation efficiency. Vacancy-containing metal oxide catalysts have broad application value in environmental remediation.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Min Jiang,Xiangyu Wang,Renchan Han,Ping Ning,Iseult Lynch,Jun Ma
A S-scheme Fe/Fe 2 O 3 @CBO photocatalyst was synthesized via a grinding calcination method, proficiently degrading tetracycline via radicals and non-radical. The reaction rate of Fe/Fe 2 O 3 @CBO-20 was recovered to 0.0255 min −1 that is 4.3 and 7.3 times as many as pristine Fe/Fe 2 O 3 and CBO after introducing visible light at the degradation process. The characterization outcomes also bear out that the S-scheme heterojunction is formed by passivation layer Fe 2 O 3 and CBO, which enhances the visible light responsiveness of catalyst and promotes the separation and transfer of photogenerated electrons to generate h + and O 2 − . Meanwhile, the molecular oxygen is more easily activated to form H 2 O 2 due to the strong reduction potential of the CB (−1.21 eV), further to facilitate the transformation of O 2 − to 1 O 2 . And the carriers excited in CBO activate Cu + , forming a Cu/Fe dual-metal electron cycle. The generated Fe 2+ reacts with H 2 O 2 to establish photocatalysis-self-Fenton system to generate ·OH. Additionally, the high TC removal in simulated aquatic environment exhibit that the catalytic performance is slightly affected by practical wastewater and the cyclic experiment show the stability and practicality. In conclusion, innovatively employing Fe/Fe 2 O 3 for pollutant degradation via photocatalytic technology, this research paves a promising and efficacious pathway for the application of Fe/Fe 2 O 3 .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
VACUUM
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2023
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IF 4
Chaoqun Yan,Zhiliang Cheng,Xuan Zhang,Juan Wei,Qian Xu
The photocatalytic efficiency of hematite (α-Fe 2 O 3 ) is limited by its photoexcited state lifetime and diffusion length. By adjusting the surface structure, the photogenerated electron pairs can migrate to the surface and the charge recombination can be suppressed, which can effectively solve these problems and improve the photo-Fenton performance. In this study, four kinds different morphologies of α-Fe 2 O 3 - x (truncated hexagonal bipyramidal, cubic, hexagonal shape, and spherical) were synthesized by hydrothermal method , and a photocatalyst (H-α-Fe 2 O 3 - x ) with higher catalytic activity was prepared by hydrogenation. The results of UV–Vis DRS , PL , Raman, and XPS analysis , the oxygen vacancies and Fe (II) species were introduced into the α-Fe 2 O 3 catalyst after the hydrogenation reaction. The H-α-Fe 2 O 3 - x showed good degradation performance for TC and DX as EMPs model pollutants. The results show that the formation of oxygen vacancy and Fe 2+ is the main factor to improve the photocatalytic activity of the reaction system. Furthermore, the reaction mechanism revealed that reactive radicals involved in the H-α-Fe 2 O 3 - x photocatalytic system were •OH, •O 2 − , and h + responsible. This study provides an alternative technology for an easy and effective means for bandgap engineering to improve the photocatalytic performance of photocatalysts and facilitate widening environmental application.
研究领域:
环境科学
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材料科学
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化学
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光催化
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xiaohua Dong,Jing Zhao,Dongya Jiang,Ziyi Lu,Xingdan Liu,Kaijia Tan,Kelvin W.K. Yeung,Xuanyong Liu,Liping Ouyang
Spinal cord injury is hard to repair due to the aggregated injury to neighbor cells caused by neuro-inflammation, which always results in severe outcomes. In this work, Tc peptide, which served as the antagonist of CXCR4 and the agonist of CXCR7, was loaded in a self-healing hydrogel. The hydrogel containing Tc was found to possess superior spinal cord injury repair abilities, including motor neuron regeneration, axon bridging repair and motor functions recovery, due to the inflammation inhibition. The mechanism analysis by RNA-sequencing and in vitro experiments found that the elevated ANT1 accelerates OPTN recruitment, which subsequently recognized by LC3 to form phagophore around dysfunctional mitochondria, resulting in a regressive NLRP3 expression. However, this regression was abolished after inhibiting OPTN. Beneficial from the mitophagy process, ROS was reduced and type 1 microglia activation was diminished. This positive feedback loop accelerated spinal cord injury repair. In summary, the hydrogel containing Tc could promote spinal cord injury repair through reducing neuro-inflammation via enhanced ANT1/OPTN axis mediated mitophagy, which may provide a new peptide containing hydrogel for repairing spinal cord injury.
研究领域:
神经科学
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生物医学工程
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材料科学
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药理学
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DOI
高影响因子
危险品化学品经营许可证（带存储）