ENVIRONMENTAL POLLUTION
·
2016
·
IF 4.839
Dun Fu,Zheng Chen,Dong Xia,Liang Shen,Yuanpeng Wang,Qingbiao Li
Solid digestate, a by-product of anaerobic digestion systems, has led to a range of environmental issues . In the present study, a novel composite based on a solid digestate-biochar-Cu NP composite was synthesized for tetracycline removal from an aqueous medium. The removal efficiency values for tetracycline (200 mg L −1 ) were 31.5% and 97.8%, respectively, by the biochar-Cu NP composite (0.5 g L −1 ) in the absence and presence of hydrogen peroxide (H 2 O 2 , 20 mM) within 6 h of reaction time. The possible degradation pathway of tetracycline was investigated using liquid chromatography-mass spectrometry. The desorption experiment results suggested that no significant concentration of tetracycline was detected on the composite after the reaction, but a small amount of intermediates in terms of total organic carbon (TOC) accounting for 3.1%, and 23.3% of the end-product NH 4 + was adsorbed onto the biochar sheets. The dispersive Cu NPs on the biochar resulted in an increase in the surface area and pore volume of the biochar-Cu NP composite, which enhanced tetracycline adsorption as well as the degradation efficiency. Relative tetracycline removal mechanisms were dominantly ascribed to ·OH generation from the Cu(II)/Cu(I) redox reaction with H 2 O 2 and the electron-transfer process of free radicals (FRs) in biochar. The proposed approach serves dual purposes of waste digestate reuse and treatment of antibiotic pollutants. This study highlights the activation of H 2 O 2 by the dispersive Cu NPs coupling with biochar derived from a waste solid digestate for tetracycline treatment.
研究领域:
环境科学
·
微生物学
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PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Guojun Weng,Yue Yang,Jing Zhao,Jianjun Li,Jian Zhu,Junwu Zhao
The fabrication of paper-based SERS substrates, which provided the advantages of active Raman signal enhancement with good reproducibility is still a challenge for real-world applications. In this report, we showed how the SERS enhancement and reproducibility of Au NP paper substrates prepared by inkjet-printed method could be improved significantly by second growth of Ag NPs. The Au/Ag NP paper substrates fabricated with the improved protocol had a much higher SERS enhancement (about 1.356✕10 3 times) compared with printed Au NP paper substrates. Moreover, the reaction parameters affected the SERS enhancement of Au/Ag NP paper substrates were optimized by collecting rhodamine 6G (R6G) SERS spectra. Further, the reproducibility of Au/Ag NP paper substrates were evaluated on random spots of single substrate and batch to batch substrates by recording the intensity of R6G at 611 cm −1 . The SERS intensities at 611 cm −1 showed small relative standard deviation, which indicated the good reproducibility of Au/Ag NP paper substrates. This improved method enabled the printed Au NP paper substrates to possess the practical applicability for the on-site SERS sensing.
研究领域:
分析化学
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材料科学
·
纳米技术
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Bao-Xuan Xie,Hai-Shuang Wang,Hui-Qian Zheng,Jin Xu,Li Chen,Fang-Zhong Zhang,Yu-Lin Wang,Zu-Jin Lin,Rong-Guang Lin
Antibacterial photodynamic therapy (aPDT) is regarded as one of the most promising antibacterial therapies due to its nonresistance, noninvasion, and rapid sterilization. However, the development of antibacterial materials with high aPDT efficacy is still a long-standing challenge. Herein, we develop an effective antibacterial photodynamic composite UiO-66-(SH)2@TCPP@AgNPs by Ag encapsulation and 4,4′,4″,4‴-(porphine-5,10,15,20-tetrayl)tetrakis(benzoic acid) (TCPP) dopant. Through a mix-and-match strategy in the self-assembly process, 2,5-dimercaptoterephthalic acid containing –SH groups and TCPP were uniformly decorated into the UiO-66-type framework to form UiO-66-(SH)2@TCPP. After Ag(I) impregnation and in situ UV light reduction, Ag NPs were formed and encapsulated into UiO-66-(SH)2@TCPP to get UiO-66-(SH)2@TCPP@AgNPs. In the resulting composite, both Ag NPs and TCPP can effectively enhance the visible light absorption, largely boosting the generation efficiency of reactive oxygen species. Notably, the nanoscale size enables it to effectively contact and be endocytosed into bacteria. Consequently, UiO-66-(SH)2@TCPP@AgNPs show a very high aPDT efficacy against Gram-negative and Gram-positive bacteria as well as drug-resistant bacteria (MRSA). Furthermore, the Ag NPs were firmly anchored at the framework by the high density of –SH moieties, avoiding the cytotoxicity caused by the leakage of Ag NPs. By in vitro experiments, UiO-66-(SH)2@TCPP@AgNPs show a very high antibacterial activity and good biocompatibility as well as the potentiality to promote cell proliferation.
研究领域:
材料科学
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纳米技术
·
生物医学工程
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微生物学
·
药学
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PubMed
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Polymer Chemistry
·
2016
·
IF 5.687
Jiangang Xiao,Jianzhong Du
Multifunctional statistical copolymers can be simply synthesized in one step without tedious and time-consuming procedures. In addition, the fuzzy boundary between different functional groups in the statistical copolymers can facilitate the fabrication of new functional nanomaterials. Herein, we designed a novel multifunctional vesicle based on a statistical copolymer, poly[[2-hydroxy-3-(naphthalen-1-ylamino)propyl methacrylate]-stat-[2-(diethylamino)ethyl methacrylate]] [P(HNA21-stat-DEA35)] which can be synthesized by reversible addition–fragmentation transfer (RAFT) polymerization in one step. The HNA moiety is designed for capturing polycyclic aromatic hydrocarbons (PAHs) by π–π stacking, while the DEA moiety is engineered to immobilize gold nanoparticles for facilitating the reduction of 4-nitrophenol (4-NP) in aqueous solution. This vesicle showed excellent ability in water remediation by absorbing PAHs and accelerating the reduction of 4-nitrophenol (4-NP). Overall, this multifunctional statistical copolymer vesicle provides a new insight for designing multifunctional water remediation materials.
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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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Fang Zhou,Yan Zhu,Longlai Yang,De-Quan Yang,Edward Sacher
Aqueous dispersions of AgCu nanoparticles (NPs), with enhanced antibacterial efficacy, have been prepared through the catalyzed reduction of Cu ions by PVP/PVA-stabilized Ag nanoparticles at 85 °C. The effects of Cu concentration and heating time on NP morphology and antibacterial efficacy were investigated, using TEM, UV-Vis and FTIR spectroscopies , and antibacterial evaluations. The enhanced antibacterial performance of these NPs was correlated with Ag ion release. We propose a simple model of AgCu NP formation, and an enhanced antibacterial efficacy mechanism involving Ag ion release, in which AgCu NPs formation plays a role to control of Ag ion release.
研究领域:
材料科学
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微生物学
·
纳米医学
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DOI
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Xin Li,Xinghua Yang,Rui Wang,Pingping Teng,Shuai Gao,Nan Lu,Xiaoyu Li,Adam Jones,Kang Li
Surface-enhanced Raman scattering (SERS) is a promising tool for sweat analysis, but signal noise, nonlinear responses, and spectral overlap limit its quantitative accuracy in complex samples. In this work, an intelligent SERS sensing strategy was developed by combining an Ag NP fractal substrate with a Gradient Kernel Size Convolutional Neural Network (GKS-CNN). The self-assembled Ag NP substrate provided abundant electromagnetic hotspots, enabling sensitive detection of lactate (LA) and glucose (Glu) from 10 −4 to 10 1 mM, with limits of detection of 108 nM and 224 nM, respectively. PCA results showed that the preprocessed SERS spectra contained distinguishable concentration-related information. Compared with linear regression, traditional machine learning methods, and standard CNNs, GKS-CNN achieved better prediction performance by extracting multi-scale features from nonlinear and overlapping spectra. For pure-component samples, the R 2 values of LA and Glu reached 0.99 and 0.98, respectively; for the joint dataset containing pure and mixed samples, the R 2 values were 0.98 and 0.97, respectively. In real sweat analysis, sample-level splitting was used to reduce data leakage, and the model classified four exercise-related states with an independent test accuracy of 95.00%. The average accuracies of 20 repeated random splits and 5-fold cross-validation were 94.50% and 93.50%, respectively. These results suggest that the proposed SERS-GKS-CNN strategy has potential for non-invasive sweat metabolite analysis and preliminary physiological-state recognition.
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高影响因子
Nanoscale
·
2017
·Vol. 9
·期 25
·8879-8888
·
IF 7.367
Xiu Liang,Yi-Shuo Wang,Ting-Ting You,Xiao-Juan Zhang,Nan Yang,Guang-Sheng Wang,Peng-Gang Yin
Interfacial self-assembly of ordered nanostructures at oil–water interfaces towards the fabrication of nanofilms has attracted the interest of plenty of scientists, since its discovery in 2004. Herein, further developments have been achieved, and we report a new strategy for the synthesis of a three-dimensional (3D) hierarchical nanostructure, through an interfacial synthesis driven microemulsion process. Thus, the synthesis route has been simplified, with the rigorous experimental conditions of traditional compositing technology. Combined with a two-step seed-mediated growth method for preparing uniform Ag-NPs, a plasmonic 3D MoS2-NS@Ag-NP nanostructure was successfully developed as a Surface-Enhanced Raman Scattering (SERS) active substrate, with plenty of surface hot spots, leading to an enhancement factor (EF) of 1.2 × 108 derived from both electromagnetic mechanism (EM) and chemical mechanism (CM) effects. The 3D MoS2-NS@Ag-NP nanostructure can be applied to detect trace thiram in apple juice and local lake water, with a detection limit as low as 10 ppb (42 nM), which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Furthermore, quantitative analysis was achieved in the range of 10 ppb–1 ppm with good homogeneity and selectivity.
研究领域:
材料科学
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分析化学
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环境科学
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ying Gao,Qinqin Chen,Xinhao Shen,Shuang Yao,Zhiwen Jiang,Sanjian Ma,Hailiang Yang,Juanhong Li,Zixia Lin,Xin Liu
Both the sluggish kinetics of Fe(II) regeneration and usage restriction of H2O2 have severely hindered the scientific progress of the Fenton reaction toward practical applications. Herein, a reduction strategy of activated hydrogen, which was used to simultaneously generate H2O2 and accelerate the regeneration of ferrous in a Fenton-like reaction based on the reduction of activated hydrogen derived from H2, was proposed. Two types of composite catalysts, namely, Pd/UiO-66(Zr)-2OH and Pd@UiO-66(Zr)-2OH, were successfully prepared by loading nano-Pd particles onto the outer and inner pores of UiO-66(Zr)-2OH in different loading modes, respectively. They were used to enhance the reduction of activated hydrogen. The characterization results based on the analysis of scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy revealed that the materials were successfully prepared. By using a trace amount of ferrous iron and without adding H2O2, trimethoprim (C0 = 20 mg·L–1), as a target pollutant, could be nearly 100% degraded within 180 min in the reaction system composed of these two materials. The cycle of iron and the self-generation of H2O2 were verified by the detection of ferrous H2O2 in the system. Density functional theory calculation results further confirmed that the pore-filled Pd0 NPs, as the main catalytic site for Pd@UiO-66(Zr)-2OH, could produce H2O2 under the combined action of hydrogen and oxygen. The Pd@UiO-66(Zr)-2OH system had excellent stability after multiple applications (at least 6 cycles), all of which resulted in 100% removal of trimethoprim. The degradation efficiency of the Pd/UiO-66(Zr)-2OH system for TMP gradually decreased from 97 to 80% after six cycles. The results of electron paramagnetic resonance combined with classical radical burst experiments revealed the degradation pathways in the reaction system with hydroxyl radicals and singlet oxygen as the main reactive oxygen particles.
研究领域:
环境科学
·
催化化学
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiedan Ren,Xuefei Chen,Shuheng Long,Houyong Yu,Xiaohua Yang
The development of highly efficient flame retardants (FRs) is crucial for enhancing the fire safety of polyamide 66 (PA66). This study synthesized a novel two-dimensional lamellar nitrogen‑phosphorus (N P) synergetic FR (C-MATP) through covalent grafting of melamine (MEL) and electrostatic adsorption of aminotrimethylenephosphoric acid (ATMP) onto cellulose nanocrystals (CNC) in an organic solvent-free environment, and applied it to prepare high-performance PA66 composites. The CNC, MEL, and ATMP synergy enabled C-MATP to generate robust intumescent char and release significant inert gases, achieving effective flame retardancy. Remarkably, the addition of C-MATP endowed the PA66 with superior flame retardancy, smoke suppression, and anti-dripping performance through the synergy of condensed and gas phases. The limiting oxygen index (LOI) and UL-94 rating of P/10C-MATP composite reached 28.1 % and V -0, respectively, along with 48.3 % and 38.8 % reductions in the total heat release (THR) and total smoke production (TSP) compared with pure PA66. Moreover, the lamellar structure of C-MATP endowed the PA66 composite with excellent thermal insulation and mechanical properties, resulting in a 100 % increase in tensile strength and a 26 % increase in elongation at break compared to pure PA66. This study presents an innovative strategy for fabricating high-performance, multifunctional PA66 materials using novel, eco-friendly, and efficient FRs.
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RSC Advances
·
2021
·Vol. 11
·期 43
·26502-26508
·
IF 3.361
Meirong Fu,Mingqiang Li,Yingying Zhao,Yunxiang Bai,Xingzhong Fang,Xiaolong Kang,Min Yang,Yanping Wei,Xia Xu
Precious metal nanometric catalysts are widely used in the removal of harmful substances. In the process of synthesis and catalytic reaction, it is particularly important to study green and simple synthesis methods and high catalytic efficiency. In this paper, a green one-step method was used to synthesize the Fe(OH)3/Fe2O3@Au composite catalyst, in which Au was single atom-dispersed. The removal of 4-nitrophenol (4-NP), a typical dangerous chemical widely existing in factory waste gas, waste water and automobile exhaust gas, was catalysed by Fe(OH)3/Fe2O3@Au. The catalytic performance of Fe(OH)3/Fe2O3@Au with different synthesis conditions (different amounts of MES, NaBH4, FeSO4, Au and Pt) on the 4-NP reduction reaction were systematically studied. Finally, the stability and recyclability of Fe(OH)3/Fe2O3@Au composite nanocatalyst were investigated thoroughly.
研究领域:
环境科学
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材料科学
·
化学工程
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PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 21
·4100
·
IF 2.468
Qi Chen,Yu Lan,Jian Shi,Weijie Liu,Bo Zhu,Dong Sun,Shunshan Duan
Sediment cores were collected from four outlets in the Pearl River Estuary (Guangdong Province, China) and dated using the210Pb method to investigate the pollution history of the area due to its relatively stable sedimentation status and hydrographic conditions in recent decades. The ages of the sediment cores were dated over 40 years (1968–2015). The concentrations at the four outlets ranged from 2.21 to 48.52 ng g−1dw for nonylphenol and were non-detectable for 23.64 ng g−1dw for bisphenol A (BPA), which exhibited a decreasing trend from north to south as well as seaward. The fluxes (2.84 to 112.91 ng cm−2yr−1and non-detectable to 59.33 ng cm−2yr−1for nonylphenol and bisphenol A, respectively) stabilized in the 1980s to 1990s due to the construction of sewage treatment systems. The fluxes increased again in the 21st century, which reached a peak ca. 2010 but declined in recent years due to the establishment of regulations and the decreasing number of industrial enterprises. Fluctuations in the pollution composition coincided with industrial development and governmental policies.Keywords:nonylphenol;bisphenol A;dry mass sedimentation rates;historical trends;Pearl River Estuary
研究领域:
环境科学
·
生态学
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PubMed
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REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Xu Zhang,Jinmao Ma,Binze Zou,Lang Ran,Lingxiao Zhu,Heng Zhang,Zhengfang Ye,Lincheng Zhou
A novel CPS-AA chelating resin containing bis Schiff base was prepared by the CPS with synthetic small molecular ligands. It has been used for the adsorption of heavy metal ions in wastewater. Ft-IR spectroscopy and the 1 H NMR spectrum proved the successful synthesis of Schiff base structure on the chelating resin. The results of adsorption experiments showed the maximum adsorption capacities for Cu (II), Pb (II) and Ni (II) were 3.74, 1.02, and 2.87 mmol/g respectively. The adsorption condition experiment proves that the material has excellent adsorption selectivity and reusability. The possible chelation mechanism was inferred to be four-tooth coordination, which is beneficial to the stretching of molecular chain and increases the adsorption capacity and stability of heavy metal ions. Finally, Cu-adsorbed composites (CPS-AA-Cu) were used as catalysts to explore the reduction and removal of 4-NP in an aqueous solution, and the results showed excellent catalytic performance.
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