SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Hao Xu,Qian Ye,Jing Zhang,Qiansong Li,Meijing Wang,Peng Zhou,Guanyu Zhou,Qingguo Wang
In response to the inherent restriction of low Fe(II) regeneration in the Fenton process, this study demonstrated a mutual-promoting configuration, where oxygen functionalized g-C 3 N 4 (OCN) was applied in Fe(III)/H 2 O 2 system to utilize mild natural solar light (SL) for persistent Fe(II) generation. The constructed OCN/Fe(III)/H 2 O 2 /SL system exhibited strong adaptability to various pollutants, and it well outperformed the g-C 3 N 4 (GCN) modified system and the traditional Fenton system in pollutants degradation efficiency. Compared with GCN, OCN could significantly promote the Fe(II) generation under solar light (SL), leading to more efficient H 2 O 2 activation. The characterization analyses revealed the larger surface area and enhanced charge separation of OCN, which were considered to take main responsibility for its enhanced photoactivity. The complexation of Fe(III) with the carboxyl groups of OCN also benefited the Fe(II) generation. ·OH was detected as the dominant radical responsible for metronidazole (MNZ) degradation, and its production in the OCN modified system was about twice that in the GCN modified system and the Fenton system. Moreover, the precipitation of FeO x on the OCN surface benefited the charge separation of the OCN, so that the improved OCN enabled a slight enhancement of MNZ degradation in the reuse experiments. The intermediates of MNZ degradation were analyzed based on the results of LC-MS, which provided insight into MNZ degradation pathways. This work highlighted the concept of self-improving photocatalyst, the ingenious combination of photocatalysis and Fenton-like system formed a mutual-promoting situation where the OCN and the Fenton-like system could both be improved, which endowed the configuration great potential for green and economical oxidation in environmental remediation.
研究领域:
环境科学
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光催化
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水处理
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高级氧化过程
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DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 14
·1131
·
IF 4.3
Xing Wei,Gaopeng Jia,Ru Chen,Yalong Zhang
In this study, the BPTCD/g-C3N4heterojunction photocatalyst was successfully prepared by the hydrothermal method. BPTCD (3,3′,4,4′-benzophenone tetracarboxylic dianhydride) is immobilised on the surface of g-C3N4by non-covalent π-π stacking. The BPTCD/g-C3N4heterojunction photocatalyst is an all-organic photocatalyst with significantly improved photocatalytic performance compared with g-C3N4. BPTCD/g-C3N4-60% was able to effectively degrade MO solution (10 mg/L) to 99.9% and 82.8% in 60 min under full spectrum and visible light. The TOC measurement results indicate that MO can ultimately be decomposed into H2O and CO2through photocatalytic action. The photodegradation of methyl orange by BPTCD/g-C3N4composite materials under sunlight is mainly attributed to the successful construction of the heterojunction structure and its excellent π-π stacking effect. Superoxide radicals (•O2−) were found to be the main active species, while•OH and h+played a secondary role. The synthesised BPTCD/g-C3N4also showed excellent stability in the activity of photodegradation of MO in wastewater, with the performance remaining above 90% after three cycles. The mechanism of the photocatalytic removal of MO dyes was also investigated by the trap agent experiments. Additionally, BPTCD/g-C3N4-60% demonstrated exceptional photodegradation performance in the degradation of methylene blue (MB). BPTCD/g-C3N4heterojunctions have great potential to degrade organic pollutants in wastewater under solar irradiation conditions.
研究领域:
材料科学
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环境化学
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光催化
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有机半导体
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废水处理
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DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 11
·833
·
IF 4.3
Song Cui,Yaocong Liu,Xiaolong Dong,Xiaohu Fan
The widespread contamination of aquatic environments by tetracycline antibiotics (TCs) poses a substantial threat to public health and ecosystem stability. Although photo-Fenton processes have demonstrated remarkable efficacy in degrading TCs, their practical application is limited by challenges associated with catalyst recyclability. This study reports the development of a novel magnetic recoverable SrFe12O19/g-C3N4heterostructure photocatalyst synthesized via a facile one-step co-calcination method using industrial-grade precursors. Comprehensive characterization revealed that nitrogen defects and the formation of heterojunction structures significantly suppress electron (e−)–hole (h+) pair recombination, thereby markedly enhancing catalytic activity. The optimized 7-SFO/CN composite removes over 90% of oxytetracycline (OTC) within 60 min, achieving degradation rate constants of 0.0393 min−1, which are 9.1 times higher than those of SrFe12O19(0.0043 min−1) and 4.2 times higher than those of g-C3N4(0.0094 min−1). The effectively separated e−play three critical roles: (i) directly activating H2O2to generate ·OH radicals, (ii) promoting the redox cycling of Fe2+/Fe3+ions, and (iii) reducing dissolved oxygen to form ·O2−species. Concurrently, h+directly oxidize OTC molecules through surface-mediated reactions. Furthermore, the 7-SFO/CN composite exhibits exceptional operational stability and applicability, offering a transformative approach for scalable photocatalytic water treatment systems. This work provides an effective strategy for designing efficient and recoverable photocatalysts for environmental remediation.
研究领域:
环境科学
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催化
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材料科学
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水处理技术
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化学工程
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纳米技术
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污染控制
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产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2016
·
IF 0.963
Qi Hu,Jia Wei,Chao Fang,Ya-Peng Li,Jing-Yuan Wang
This study aimed to synthesize a dual-modal magnetic resonance imaging (MRI)/fluorescence imaging (FLI) nanoprobe in order to detect atherosclerosis. Herein, we had prepared the polyamidoamine-graft-poly (ethylene glycol) (PAMAM-g-PEG) as the carrier. Dextran sulfate (DS) and Rhodamine B (RB) were grafted to PAMAM-g-PEG continuously through reductive amination and amidation reaction to synthesize PAMAM-g-PEG-g-DS-g-RB. The structure of PAMAM-g-PEG-g-DS-g-RB was characterized through nuclear magnetic resonance (1H-NMR) and Fourier transform infrared spectroscopy (FTIR). A new water-soluble superparamagnetic iron oxide nanoparticles (IONPs) has been synthesized through simple ligand exchange between the iron oxide nanaparticles and PAMAM-g-PEG-g-DS-g-RB. The analysis of transmission electron microscopy (TEM) indicated that micelles were well dispersed in water and had uniform sizes. The result of thermogravimetric analysis (TGA) proved that about 83% (mass fraction) polymers were coated on the surface of IONPs. The MRI in vitro evaluation demonstrated a high R2 value (130.8 mM−1s−1) to be served as a T2-weighted contrast agent. The cell counting kit (CCK) assay showed no significant toxicity in RAW264.7. The above results confirmed that PAMAM-g-PEG-g-DS-g-RB@IO could play an significant role of MRI and FLI in the atherosclerosis.
研究领域:
纳米医学
·
生物医学成像
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材料科学
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心血管研究
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2021
·
IF 10.618
Junping Ma,Wushuang Bai,Jianbin Zheng
A self-cleaning electrochemical biosensor based on two-dimensional Cu-porphyrin (Cu-TCPP) metal-organic framework nanofilms , novel super G-quadruplex (G4), and DNA nanomotors was developed for the cyclic detection of Pb 2+ ions. The Cu-TCPP framework with inherent peroxidase activity can create an ultra-thin nanofilm that functioned as a carrier to support the metastable G4 comprising four individual DNA strands. The introduction of Pb 2+ and the intercalation of hemin can help it to form stable G4-hemin DNAzymes, which exhibits strong catalytic H 2 O 2 reduction activity, and its number will be directly related to the amount of the introduced Pb 2+ . Moreover, a DNA nanomotor system is introduced to achieve cyclic detection, and the addition of the fuel DNA strands enables G4 to perform a “complete-dissociation-complete” process for achieving self-cleaning of the electrode interface and the cycle detection of Pb 2+ . The synergistic effects of Cu-TCPP and G4-hemin DNAzymes, which exhibits efficient and catalytic H 2 O 2 reduction, enhance the performance of the electrochemical sensing system. The linear range of this sensor to Pb 2+ is 5 nM–5 μM, and the detection limit is 1.7 nM. Compared with the best system in reported studies, its linear range is five times wider and its detection limit is lower than the previously lowest one. Taking advantage of the Pb 2+ stabilized G4, the proposed sensor can selectively detect Pb 2+ in the presence of other metal ions . The results presented herein comprise a valuable reference for constructing DNA nanoelectronic devices and establish sensitive and cyclic detection of the target and preparing of self-cleaning electrode interfaces.
研究领域:
分析化学
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生物化学
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纳米技术
·
环境科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Islam A. Abdelhafeez,Jiabin Chen,Xuefei Zhou
Herein, we report a scalable, green and “bottom-up” approach for the synthesis of ultralight g-C 3 N 4 nanosheets . The ultralight g-C 3 N 4 nanosheets (9.6 mg cm −3 ) have been entirely synthesized in a wet atmosphere in one step without pretreatment or any other additives. The as-prepared material (UMCN-wet) appears as a foam-like exterior with ultrathin nanosheets (3.5 nm), short-order polymerization and sharp edges. The X-ray diffraction (XRD), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses confirm the formation of melon units with edge-enriched active sites. UMCN-wet exhibits a higher specific surface area (137.44 m 2 g −1 ) and pore volume (0.2076 cm 3 g −1 ), compared with that of the as-synthesized materials in the air (MCN-air) and nitrogen (MCN-N 2 ) atmospheres. The optical and electrochemical analyses reveal that UMCN-wet manifests fast photogenerated charge separation and transfer with slow decay kinetics. As a result, UMCN-wet nanosheets exhibit superb photocatalytic degradation of rhodamine B (RhB), methylene blue (MB) and methyl orange (MO) under visible light irradiation with photodegradation rate constant ( k ) of 0.17687, 0.02409 and 0.00537 min −1 , respectively. Moreover, UMCN-wet exhibits excellent stability and reusability performance. Such a sustainable approach does not only overcome the prolonged time processing, extra energy consumption and utilization of hazardous chemicals for synthesis ultrathin g-C 3 N 4 nanosheets, but also paves a new pathway for industrial upscale production with numerous expected environmental applications.
研究领域:
材料科学
·
纳米技术
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环境科学
·
化学工程
·
光化学
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DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Xiangyu Fan,Hao Zhang,XinRu Zhao,Ke Lv,Tiying Zhu,Yaping Xia,Cheng Yang,Chengjie Bai
Three-dimensional (3D) SERS substrate with the denser “hotspots” is synthesized by the constriction of PDMS film decorated with sandwiched [email protected] @graphene ( [email protected] @G) nanostructure . Graphene layers above and below the AgNPs are used to absorb molecules onto the “hotspots”, and prevent the oxidation of AgNPs in our design. PDMS films can be easily shrunk for 3D structures, causing advantages in enhancement ability and light-matter interaction. Benefiting from the above advantages, a detection limit of 10 −14 M (CV) and enhancement factor (EF) of 3.9 × 10 9 were obtained in our experiment. Theoretical analyses (FDTD) were also used to study the enhancement mechanism. For practical purposes, in-situ detection of MG molecules on the fish surface and the label-free detection of DNA base of adenine (A) and cytosine (C) were also studied. The high enhancement factor, great sensitivity, reliability, and stability of substrate reasonably proved that it can be used as an excellent SERS substrate for biomolecular detection.
研究领域:
材料科学
·
生物传感
·
光学
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zeyi Wang,Yuzhen Qian,Guozhen Wang,Xinyu Sun,Jingcheng Hao
Supramolecular ionogels, as an emerging class of materials, utilize the intriguing properties of ionic liquids (ILs) and offer a promising method for constructing functional materials in anhydrous solvents. G-Quadruplex, assembled from guanine-rich nucleic acid building blocks, is an important structure closely associated with life and leads to the gelation for constructing versatile materials, such as the electrolytes of supercapacitors. Herein, we design and fabricate G-quadruplex ionogels using an unreported cation. Among the metal acetylacetonates under investigation, iron(III) acetylacetonate is distinctive in its capacity to stabilize G-quadruplexes through a reaction with the solvent ethylammonium nitrate (EAN), resulting in the formation of Fe(acac)2+. The ionogel displays high ionic conductivity (6.43 mS·cm–1), a wide electrochemical stability window (2.86 V), and self-healing properties. The supercapacitor based on the G-quadruplex ionogel electrolyte delivers a gravimetric capacitance of 91.8 F·g–1, a high energy density of 32.6 W h/kg, and a power density of 319.8 W/kg at a current density of 0.2A·g–1. Therefore, the present findings have important implications for deepening the understanding of G-quadruplex structures and metal acetylacetonate complexes and provide an approach to fabricating ionogel electrolytes for high-performance supercapacitors.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiaohong Liu,Libo Li,Fang Li,Wanlin Zhao,Lijun Luo,Xiaoya Bi,Xia Li,Tianyan You
Signal amplification provides an effective way to improve detection performance. Herein, an ultrasensitive electrochemiluminescence (ECL) aptasensor for Pb 2+ detection was developed based on a dual signal-amplification strategy of the abscission of a quencher and the generation of a G-quadruplex by one-step and simultaneous way. Nitrogen-doped carbon quantum dots linked with complementary DNA (cDNA-NCQDs) at the sensing interface was applied as the quencher of a tris(4,4′-dicarboxylic acid-2,2′-bipyridyl)ruthenium(II) (Ru(dcbpy) 3 2+ )/tripropylamine system to minimize the ECL signal due to the intermolecular hydrogen bond-induced energy-transfer process. Upon the addition of Pb 2+ , its specific binding with the aptamer triggered the abscission of cDNA-NCQDs, accompanied by the formation of G-quadruplex on the surface of the electrode, both of which amplified the intensity of the light emission. The ECL amplification efficiency induced by the above two mechanisms (78.6%) was valuably greater than that of their sum value (69.3%). This synergistic effect resulted in high detection sensitivity of the ECL aptasensor, which allowed to thereby obtain Pb 2+ measurements in the range of 1 fM - 10 nM with an ultra-low detection limit of 0.19 fM. The Pb 2+ -mediated synergistic signal-amplification ECL strategy can provide a new approach for integrating various amplification strategies.
研究领域:
分析化学
·
环境科学
·
材料科学
·
纳米技术
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Meixia Zheng,Fengli Lian,Yujing Zhu,Yi Zhang,Bo Liu,Longtao Zhang,Baodong Zheng
Poly ( xanthan gum-g-acrylamide-g-acrylic acid) (XGDA) hydrogel was prepared by grafting acrylamide (AM) and partly neutralized acrylic acid (AA) onto xanthan gum (XG) with trimethylolpropane triglycidyl ether as a cross-linking agent. With the introduction of amino and carboxyl groups by AM and AA, the XG molecules were rearranged with better regularity, leading to higher thermal stability and a more porous structure. The resulting hydrogel exhibited excellent performance in Cu (II)-adsorption and possessed sensitivity to external pH stimuli. The adsorption kinetics and adsorption equilibrium were best described by a pseudo-second-order model and Freundlich isotherms, respectively. The thermodynamic parameters indicated that the adsorption is a spontaneous, endothermic, and a process that increases entropy. The maximum equilibrium adsorption capacity of Cu (II) was 130.31 ± 2.97 mg/g. The XGDA can be regenerated and reused in the following adsorption process. This pH-sensitive hydrogel has potential to be used for the uptake of heavy metal ions from aqueous solution.
研究领域:
材料科学
·
环境科学
·
化学工程
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DOI
高影响因子
Microbiology Spectrum
·
2022
·Vol. 10
·期 3
·
IF 9.043
Lu Lv,Leiliang Zhang
Human enteroviruses cause many diseases; however, there is no specific therapeutic drug. G-quadruplex is an atypical secondary structure formed in the guanine rich region of DNA or RNA, which can exist in the viral genome. The different positions of G-quadruplex play an important role in the regulation of virus replication and infection. Whether G-quadruplexes are present in human enteroviruses is unknown. In current study, we analyzed the potential quadruplex forming sequences of human enteroviruses, especially EV-A71 virus, which causes hand, foot, and mouth disease. The results showed that there were a certain number of potential quadruplex-forming sequences in human enteroviruses. Through a variety of experimental methods, we evaluated the formation potential of EV-A71 encoded G-quadruplex and analyzed the binding ability of G-quadruplex ligands, including BRACO-19, pyridostatin and TMPyP4 to virus encoded G-quadruplexes. G-quadruplex ligands BRACO-19, PDS and TMPyP4 could inhibit the transcription of constructs containing EV-A71 G-quadruplex sequences. Moreover, we found that BRACO-19 was able to inhibit the replication of EV-A71, suggesting that targeting G-quadruplexes in EV-A71 genome by G-quadruplex ligands could be a novel antiviral way against EV-A71. Our finding not only uncovered the G-quadruplexes in human enteroviruses, but also would provide a new strategy for human enteroviruses therapy.IMPORTANCE G-quadruplex is a stable nucleic acid secondary structure formed by the folding of guanine rich nucleic acid. The important regulatory function of G-quadruplex makes it an attractive target of antiviral effect. Human enteroviruses cause a variety of human diseases, including common cold, nervous system diseases, cardiovascular damage, and diabetes. Enterovirus A71 (EV-A71) is one of pathogens causing hand, foot, and mouth disease; however, whether G-quadruplexes are present in the genomes of human enteroviruses is unknown. The function of G-quadruplexes in the EV-A71 genomes is not clear. We predicted and characterized G-quadruplex sequences in EV-A71. G-quadruplex ligands were identified to stabilize EV-A71 G-quadruplexes with high affinities. We also demonstrated G-quadruplex ligand BRACO-19 inhibited EV-A71 replication. Our studies provide a framework for targeting G-quadruplexes in the enteroviruses genome, which will be a new way to develop antiviral agents against human enteroviruses.
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PubMed
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 40
·7413-7419
·
IF 1.915
Min Huang,Hanying Li,Hanping He,Xiuhua Zhang,Shengfu Wang
The sequence-specific recognition of SNPs is important for disease diagnosis and human gene therapy. In this work, a simple sensor based on electrochemical impedance spectroscopy (EIS) was developed for the highly sensitive and specific detection of G–G mismatches in dsDNA using a small molecule-modified gold electrode. After the electrochemical impedance sensor was incubated with G–G mismatched dsDNA, its charge-transfer resistance (Rct) increased significantly. Meanwhile, only a small increase in Rct values was observed for dsDNA with other base mismatches and for complementary dsDNA. Importantly, G–G mismatched dsDNA was selectively detected based on differences in charge transfer resistance (ΔRct) even in the presence of other DNA and ct-DNA. Under optimal experimental conditions, the established EIS sensor was used to quantify G–G mismatched dsDNA based on the linear relationship between ΔRct and the logarithm of the concentration of G–G mismatched dsDNA from 1 nM to 1 μM with a detection limit of 0.3 nmol L−1. This sensing strategy is a potential alternative tool for measuring G–G mismatched DNA for the diagnosis and early clinical detection of genetic diseases.
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DOI
高影响因子
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