CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Peng Xu,Shiqi Xie,Xin Liu,Lei Wang,Xiangwen Jia,Chao Yang
CuFe 2 O 4 (CFO) nanoparticles have been used to induce peroxymonosulfate (PMS) for degrading contaminants, while the slow reduction from high valence metals to low valence metals on CFO surface limited its reaction activity. In our study, the introduction of electric field greatly enhanced the activation of PMS by CFO for the degradation of diclofenac (DCF). The removal efficiency and the electrical energy per order of the EC/PMS/CFO system reached 89.9% and 2.12 kWh m −3 order −1 respectively within 60 min under optimal conditions of 0.3 g/L CFO, 2 mM PMS, 8 mA/cm 2 current density and initial pH of 6. Electron spin resonance analysis and quenching experiments including ethanol, tertbutyl alcohol, furfuryl alcohol and p-benzoquinone proved that SO 4 •− , •OH and 1 O 2 were the main reactive oxygen species in the EC/PMS/CFO system. The cyclic voltammetry test and the X-ray photoelectron spectroscopy demonstrated that both PMS and electric field accelerated the cycles of Fe(III)/Fe(II) and Cu(II)/Cu(I), promoting the generation of reactive oxygen species. Except for the inhibition effect of humic acid and HPO 4 − , NO 3 − had no impact on the degradation of DCF, while HCO 3 − and Cl − accelerated the degradation of DCF in the EC/PMS/CFO system. Furthermore, >90% of DCF in tap water and Houhu lake water was degraded by the EC/PMS/CFO system. The reusability experiment verified that CFO was stable, and the leaching concentrations of copper and iron in each run were less than the legal limits of the U.S. Environmental Protection Agency. This work might provide a feasible strategy for enhancing PMS activation through coupling transition metals with an electric field.
研究领域:
环境科学
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电化学
·
污染控制
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产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2021
·
IF 4.384
Ding Zhang,Boqi Chen,Qingke Mu,Wei Wang,Kaili Liang,Liyan Wang,Qing Wang
Anti-cutaneous melanoma activity of the skin-delivered gambogic acid (GA) has been reported in our previous study. However, it is difficult for GA to diffuse passively through intact skin without any enhancement means. In this study, a combination of chemical enhancers (EN: azone and propylene glycol) and physical ultrasound (US) was used to improve the percutaneous permeation of GA and enhance the anti-melanoma activity. The enhancement effect of the combination of EN and US (EN-US) on GA in vitro and in vivo was studied, and the enhancement mechanism and skin irritation were also evaluated. We showed that the parameters of US application at a constant frequency (30 kHz) with a duty cycle of 100% and intensity of 1.75 W/cm 2 for 20 min were optimal. In vitro , EN-US showed a considerable enhancement of the permeation of GA, and the enhancement effect was stronger than that with the use of EN or US alone. In vivo antitumor study showed that the tumor growth was significantly inhibited after percutaneous administration of GA by EN-US, more than in the intravenous injection group. The penetration enhancement mechanism revealed that EN-US not only altered the structure of lipid bilayers and keratins to reduce the barrier effect of the stratum corneum but also produced diffusion channels in the skin under the cavitation effect of US, thereby promoting the skin penetration of GA. In addition, there was no observable skin irritation in mice after treatment with EN-US. Our study demonstrated that the combination of EN and US improved the skin permeation and retention of GA to enhance the anti-melanoma activity. This method also provides technical guidance for the future development of topical and transdermal therapeutic system of GA.
研究领域:
药理学
·
肿瘤学
·
皮肤病学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lili Liu,Jun Wang,Jianan Li,Meng Zhang,Yunxiao Zhang,Rui Zhan,Jiaxin Li,Zhiping Wang
The efficient mineralization of antibiotics in production waste drainage (PWD) and fermentation residue leachate (FRL) is crucial for avoiding environmental accumulation and the generation of antibiotic-resistant bacteria and genes. In this study, the penicillin G (PG) containing PWD and FRL were treated by electrochemical enhanced heterogeneous activation of peroxymonosulfate with CoFe 2 O 4 nanoparticles (EC/CoFe 2 O 4 /PMS). The results indicated that the mineralization rate of PG did not improve significantly in EC/CoFe 2 O 4 /PMS system (39.0 %) with the same reaction condition ([CoFe 2 O 4 ] = 100 mg L -1 , [PMS] = 152 mg L -1 , [Na 2 SO 4 ] = 20 mM) of CoFe 2 O 4 /PMS system (28.1 %) coupled with 1 V cm −1 electric field. Meanwhile, the toxic intermediate product ( P 4) was detected. However, at the condition of catalyst saving mode (CSM, [CoFe 2 O 4 ] = 50 mg L -1 , [PMS] = 250 mg L -1 , [Na 2 SO 4 ] = 20 mM, E = 1 V cm −1 ), the mineralization rate of PG in artificial wastewater reached 69.1 %, which was further increased to 88.0 % and 76.5 % in the PWD and FRL, respectively. Although the removal rate of pollutants even exceeded 90 %, most of them were not meet the direct discharge requirements of China due to their high concentration in initial PWD and FRL. However, the ratio of BOD 5 /COD (represented the biodegradability) of PWD and FRL significantly increased from 0.18 and 0.37 to 0.47 and 0.79 at the end of the experiment, respectively, and the P 4 was not detected. Therefore, EC/CoFe 2 O 4 /PMS system with CSM operation mode could eliminate PG completely and achieve deep mineralization, which improved the biodegradability of production drainage, and might achieve complete mineralization of PG through combination of bioremediation methods.
研究领域:
环境科学
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生物工程
·
废水处理
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qianyu Zhang,Xiaoqin Sun,Yuan Dang,Jun-Jie Zhu,Yuan Zhao,Xiaoxiang Xu,Yuanzhen Zhou
A novel electrochemically enhanced homogeneous-heterogeneous catalytic system was constructed by placing the prepared heterogeneous catalyst (CoFe 2 O 4 /NF) in parallel between the anode and the cathode for peroxymonosulfate (PMS) activation to remove levofloxacin (LVF) in this work. Over 90% of LVF could be effectively removed by the constructed system after 40 min's degradation. And the electrical energy consumption was only 2.51 kWh/m 3 , which was lower than 54.5% of the traditional electrochemical advanced oxidation process . Besides, the system broadened the response range of pH and overcame the inhibitory effect of alkaline conditions on degradation. These activities were mainly due to the high generation ability of free radical (SO 4 ·- , ·OH and O 2 ·- ) and non-radical ( 1 O 2 ). And the SO 4 ·- was found to be the main radical for LVF degradation. The high SO 4 ·- generation ability was demonstrated to be resulted from the dual effects of synergy of CoFe 2 O 4 /PMS and enhancement of electrochemistry in EC/CoFe 2 O 4 /PMS system. In detail, electrochemistry could effectively promote the continuous circulation of Co 2+ /Co 3+ and Fe 2+ /Fe 3+ redox cycles on the surface of CoFe 2 O 4 to enhance the activation of PMS , thereby generating SO 4 ·- . This work can provide a promising and cost-effective approach to construct highly efficient organic pollutant degradation system.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2025
·
IF 6.1
Rongjing Hu,Shilan Fu,Yongcong Zhou,Zhenyu Lin,Fengfu Fu,Yongqiang Dong
The current surface-enhanced Raman scattering (SERS) substrates typically feature a single energy level, posing challenges in coordinating electromagnetic enhancement (EM) and chemical enhancement (CM), thereby limiting the sensitive detection of numerous crucial target molecules. In this study, novel aggregated nanorings (a-NRs) hybridizing Ag, Au and AgCl are constructed as SERS substrates. On one hand, the obtained a-NRs exhibit robust localized surface plasmon resonance absorption, whose wavelength can be tuned to match three commonly used laser wavelengths (532, 633 and 785 nm) to gain strong EM effect. On the other hand, these materials possess the Fermi levels of Au nanoparticles and Au/Ag alloy, in addition to the valence band and conduction band of AgCl. The abundant energy levels of the obtained a-NRs facilitate increased charge transfer opportunities for molecules, leading to a strong CM effect. Therefore, the obtained a-NRs show ultra-high SERS sensitivity towards numerous molecules. Moreover, the unique chemical composition makes the obtained a-NRs have good long-term stability in terms of SERS activity. Besides providing high-performance SERS substrates, the valuable experience for coordinating EM and CM to construct highly active SERS substrate demonstrated in this work are expected to significantly advance the application of SERS.
研究领域:
材料科学
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光谱学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Qingling Zhang,Youliang Cheng,Changqing Fang,Jiayu Shi,Hanzhi Han,Mengyao Li,Jiarui Zhao
Monolithic carbon foams are promising materials for adsorption due to the easy recyclability and without secondary-pollution. However, poor adsorption efficiency for organic pollutants limits its practical application. Hence, this work proposed a novel monolithic porous carbon foam by a facile carbonization approach as freestanding electrodes to remove the organic dyes. The prepared carbon foam derived from waste cigarette filters and zeolitic-imidazolate frameworks-8 with well-developed pores, and the calculated surface area is 1457 m 2 ·g −1 , and exhibited an outstanding removal efficiency for methylene blue in aqueous. The maximum adsorption capacity for methylene blue can reach up to 1846.7 mg·g −1 under the applied voltage of −1.2 V. Importantly, as-prepared carbon foams possessed excellent stability, and the removal efficiency can remain above 85% after 5 cycles. Thus, obtained porous carbon foams in this paper as a free standing electrode is expected to be promising materials of adsorbent besides supercapacitors.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 7
·4112-4117
·
IF 3.361
Qi Ding,Liping Cao,Minghuan Liu,Hetong Lin,Da-Peng Yang
Eggshell is an extremely large source of domestic waste and has a huge scientific research potential because of its unique porous hierarchical structure. By converting eggshell waste into valuable functional materials, it can be recycled in many fields. Herein, we envisioned an economical and environmentally friendly conversion method for synthesizing Au nanoparticle loaded eggshell nanocomposites (defined as Au/CaCO3 nanocomposites) for the detection of trace amounts of nitrite in oolong tea. Compared with bare electrodes, the prepared Au/CaCO3 nanocomposite-based electrodes have obvious electrochemical enhancement behavior. A wide linear response range of 0.01 to 1.00 mM and a relatively low detection limit of 11.55 nM have been obtained in this study. The “turning waste into treasure” transformation strategy not only provides a practical and low-cost method for comprehensive utilization of eggshells as valuable functional materials, but also provides a new approach for sensitive detection of pollutants.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 6
·1-8
·
IF 6.232
Liang Pei,Cao Yu,Dong Qianmin,Wang Dan,Zhang De,Jin Shangzhong,Yu Zhi,Ye Jiaming,Zou Mingqiang
Simple and traditional hydrothermal fabrication of a novel balsam pear-shaped CuO with high SERS enhancement is presented. XRD (X-ray diffraction), SEM (scanning electronic microscopy), TEM (transmission electron microscope), HRTEM (high-resolution transmission electron microscope), UV-Vis, and Raman are adopted to ensure that this balsam pear-shaped CuO with dense nanoparticle protuberance is successfully prepared. The LOD of this CuO SERS substrate is 4.79 μg L −1 with R6G as molecular probe. By using DFT (density functional theory) calculation and FDTD (finite difference time domainmethod) simulation, both EM (electromagnetic enhancement) and CM (chemical enhancement) mechanisms are investigated, and the results show that these two-enhancement mechanisms can coexist in this balsam pear-shaped CuO. Finally, the prepared substrate has been applied for the determination of trace levels of paraquat in solution , and results show that its LOD for paraquat is 275 μg L −1 (optimum Raman band: 1646 cm −1 Raman shift), which is better than the government standard in China. A dexterous and facile way for fabrication of CuO SERS-active substrates with low cost and high performance, quite promising in detection of chemically hazardous substances and pesticide residue is provided.
Graphical abstract
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Hao Zhong,Zhenyu Lin,Yongqiang Dong
For the first time, single-layer carbon dots (CDs) were used as capping agents to synthesize cuprous oxide nanosheets (Cu2O-NSs) as a high-performance surface enhanced Raman scattering (SERS) substrate, emphasizing their chemical enhancement mechanism. The Cu2O-NSs, synthesized using single-layer carbon dots as capping agents, exhibit uniform morphology and remarkable SERS activity, achieving an enhancement factor of 4.97 × 105 for crystal violet under 532 nm laser excitation. The SERS enhancement is primarily attributed to photoinduced charge transfer between the Cu2O-NSs and analyte molecules, as confirmed by energy-level alignment studies. The substrate demonstrates excellent signal homogeneity, batch-to-batch reproducibility, and long-term stability, with no significant signal attenuation over 60 days. These findings underscore the potential of Cu2O-NSs as a cost-effective and stable SERS substrate, with promising applications in chemical sensing and molecular detection.
研究领域:
材料科学
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分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-7
·
IF 17.694
Feng Haijun,Zheng Ning,Peng Wenjun,Ni Chujun,Song Huijie,Zhao Qian,Xie Tao
Thermoset polymers are indispensable but their environmental impact has been an ever-increasing concern given their typical intractability. Although concepts enabling their reprocessing have been demonstrated, their practical potential is limited by the deteriorated performance of the reprocessed materials. Here, we report a thiourea based thermoset elastomer that can be reprocessed with enhanced mechanical properties. We reveal that the thiourea bonds are dynamic which leads to the reprocessibility. More importantly, they can undergo selective oxidation during high temperature reprocessing, resulting in significant chemical strengthening within certain reprocessing cycles. This is opposite to most polymers for which reprocessing typically results in material deterioration. The possibility of having materials with inherent reprocessing induced performance enhancement points to a promising direction towards polymer recycling.
研究领域:
材料科学
·
聚合物化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
De Zhang,Pei Liang,Zhi Yu,Jie Huang,Dejiang Ni,Haibo Shu,Qian-min Dong
In this paper, the flower-shaped silver nanoparticle was used as substrate to investigate the SERS effect of pesticide molecules under different treatment conditions. Due to the variation of molecular structure and molecular interactions with pH value and solvent type, the combination mode of molecules and metal surface and electron transfer also changes, resulting in different SERS effects with a certain regularity. It was demonstrated that the optimum pH values for test conditions are in the range of 6.66–11.11 due to the auxiliary of H + ions and undestroyed complete functional groups of ethion. Meanwhile, the ethion in the acetone was the best in the three solvents (ultrapure water, absolute ethanol and acetone). Under optimal conditions, ethion can be detected with a minimum detectable concentration of 10 −10 M. The regression model obtained through principal component analysis (PCA) can be used for rapid and precise detection of the concentration of ethion, suggesting the importance of condition optimization for SERS test. Therefore, the solvent environment can be effectively improved to promote non-resonance enhancement of chemical bonding between adsorbate and metal substrate and resonance enhancement of light-induced charge transfer in molecular-metal system by excitation light. The solvent environment has significant effect on the SERS sensor from chemical enhancement.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 42
·425603
·
IF 2.9
Hao Chen,ZhaoGuo Wu,AiWu Zhao,Jin Wang
To enhance the stability of Raman reporters, these reporters were trapped in a metal organic framework (MOF) exoskeleton that was grown and compressed on Fe3O4@Au core–satellites, producing recyclable surface-enhanced Raman scattering (SERS) nanotags. Furthermore, encapsulation of Raman reporters in the assembled MOF-based nanocomposites was divided into two types of patterns, pre-enrichment and post-enrichment, in order to disentangle chemical enhancement of charge transfer (CT) from electromagnetic enhancement (EM) in SERS. Hence, to demonstrate the effect of encapsulation, a typical non-thiolated Raman reporter, for example crystal violet (CV) trapped in a core–satellite nanoassembly-based zeolitic imidazolate framework (ZIF-8) shell, was selected. The results suggest that stability and Raman intensity are remarkably improved. Moreover, the pattern of incorporation of CV into the ZIF-8 shell with tunable shell thickness can contribute to the disentangling of CT effects from EM effects.
研究领域:
材料科学
·
光谱学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）