SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiange Peng,Gengping Wan,Lihong Wu,Min Zeng,Shiwei Lin,Guizhen Wang
The exploitation of multifunctional nanomaterials used for colorimetric biosensing assays is highly desired in diagnostic applications. In this paper, a novel TiO 2 -encapsulated Au ( [email protected] 2 ) yolk-shell nanostructure was synthesized via a simple and controllable method, in which the TiO 2 nanotubes could effectively restrain the aggregation and growth of Au nanoparticles and supply more active sites and high surface areas for biocatalytic reactions. The microstructure and composition of as-prepared nanocomposites were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution TEM (HRTEM), and X-ray photoelectron spectroscopy (XPS). The results demonstrated that unique [email protected] 2 yolk-shell nanostructure with the well-dispersed Au nanoparticles confined in nanotube was obtained. The investigation of peroxidase-like activity of [email protected] 2 nanocomposites confirmed that the relative catalytic kinetic followed Michaelis–Menten behaviors. On the basis of the highly efficient peroxidase-like activity of [email protected] 2 , an effective method for colorimetric detection of H 2 O 2 and glucose was established. Considering numerous advantages including reduced aggregation, good chemical stability and high catalytic activity available by the present [email protected] 2 with unique structure, designing other yolk-shell nanostructures with exact function orientation using a similar strategy may also be very promising in the application of biocatalysis and bioassays.
研究领域:
纳米技术
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生物传感
·
催化
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Danya Zhan,Qiongfen Yu,Ming Li,Zhenhua Gu,Shengnan Sun,Yinning Li,Aimin Li,Rong Zhu,Zhongfan Mo,Runfang Ma
Utilizing biological resources facilitates alleviating energy shortage and environmental pollution problems, but high-value utilization of these resources requires breaking the biomass structure. This study realized the clean and efficient separation of cellulose, hemicellulose, and lignin from tobacco stems using a sustainable H 2 O 2 -enhanced alkaline pretreatment combined with acid and ethanol precipitation. The purity and thermal stability of the separated cellulose increased from 32.49% to 92.41% and 261 °C to 369 °C, respectively. Changes in the cellulose crystal form and the solubilization mechanisms of hemicellulose and lignin were elucidated. In addition, a food-preservation film was prepared from the obtained biocellulose using the solution-casting method. After adding glycerol and sorbitol as plasticizers , the tensile strength and water-contact angle (a hydrophobicity indicator) of the biocellulose composite film increased from 125 MPa to 154 MPa and from 50.48° to 73.16°, respectively. This study provides a platform for lignocellulosic biomass separation, renewable utilization, and a practical route toward functional biomaterial production.
研究领域:
生物化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 47
·67310-67320
·
IF 4.223
Liu Yanan,Zhou Quan,Li Zhenyu,Zhang Ai,Zhan Jiaxun,Miruka Andere Clement,Gao Xiaoting,Wang Jie
Glucocorticoids (GCs) have drawn great concern due to widespread contamination in the environment and application in treating COVID-19. Most studies on GC removal mainly focused on aquatic environment, while GC behaviors in soil were less mentioned. In this study, degradation of three selected GCs in soil has been investigated using citric acid (CA)–modified Fenton-like processes (H 2 O 2 /Fe(III)/CA and CaO 2 /Fe(III)/CA treatments). The results showed that GCs in soil can be removed by modified Fenton-like processes (removal efficiency gt; 70% for 24 h). CaO 2 /Fe(III)/CA was more efficient than H 2 O 2 /Fe(III)/CA at low oxidant dosage (< 0.28–0.69 mmol/g) for long treatment time (> 4 h). Besides the chemical assessment with GC removal, effects of Fenton-like processes were also evaluated by biological assessments with bacteria and plants. CaO 2 /Fe(III)/CA was less harmful to the richness and diversity of microorganisms in soil compared to H 2 O 2 /Fe(III)/CA. Weaker phytotoxic effects were observed on GC-contaminated soil treated by CaO 2 /Fe(III)/CA than H 2 O 2 /Fe(III)/CA. This study, therefore, recommends CaO 2 -based treatments to remediate GC-contaminated soils. Graphical abstract
研究领域:
环境科学
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土壤学
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生态毒理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Xueyu Zan,Shiqi Tao,Chaoyu Zhang,Yixiao Wu,Yongjun Liu,Wei Huang
Direct conversion of methane and carbon dioxide into acetic acid is a dream way to address the two greenhouse gases, but is challenged by their chemical inertness. Cu and Pd are promising candidates both in CH 4 and CO 2 activation as well as the subsequent C-C coupling reactions at low temperature. Herein, we report that acetic acid can be produced by the direct coupling of CH 4 and CO 2 in the presence of H 2 O 2 over Cu-Pd/Al 2 O 3 catalysts at 50 °C. Results show that the acetic acid yield reaches 48.1 μmol·g cat −1 ·h −1 on the optimized reaction condition over Cu 3.8 -Pd 1.6 /Al 2 O 3 catalyst, which is higher than that of either mono-Cu or mono-Pd catalyst. Extensive characterization indicates the higher activity of Cu 3.8 -Pd 1.6 /Al 2 O 3 catalyst is attributed to the strong synergistic effect between Cu and Pd, which results in the formation of CuPdO 2 phase, and thus promoting the electron transfer from Cu to Pd. DRIFTS experiments reveal that acetic acid is produced by the coupling of CH 3 * and COOH* over CuPdO 2 active sites via Langmuir-Hinshelwood mechanism, where CH 3 * is originated from CH 4 dehydrogenation step, and COOH* may formed by the activation of CO 2 by H 2 O 2 . This study provides a new approach for the co-conversion of CH 4 and CO 2 into acetic acid at low temperature.
研究领域:
化学工程
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催化
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Medicine Reports
·
2019
·Vol. 19
·期 6
·4579-4588
·
IF 1.851
Shiqi Wang,Fuwei He,Zhenwei Li,Yewen Hu,Ning Huangfu,Xiaomin Chen
Oxidative stress serves important roles in cardiac injury during the process of ischemia/reperfusion (I/R). Y‑box protein 1 (YB1), a member of the highly conserved Y‑box protein family, is closely associated with inflammation and stress responses by regulating gene transcription, RNA splicing and mRNA translation. However, the roles of YB1 in oxidative stress‑induced myocardial‑I/R (M‑I/R) injury are unknown. The aim of the present study was to examine the effects of YB1 on H2O2‑induced cardiomyocyte injury and its underlying mechanism. The results demonstrated that YB1 expression was upregulated during H2O2‑induced myocardial injury. YB1 knockdown through transfection of small interfering RNA significantly aggravated cardiac cell apoptosis. Furthermore, YB1 knockdown significantly reversed the H2O2‑mediated increase in phosphorylated signal transducer and activator of transcription (STAT)3, but did not affect the phosphorylation of P38, extracellular signal‑regulated kinases 1/2, c‑Jun N‑terminal kinases, P65, Janus kinase 1 and 2 or STAT1. Moreover, protein co‑immunoprecipitation and RNA‑binding protein immunoprecipitation assays revealed that YB1 interacted with protein inhibitor of activated STAT 3 (PIAS3) mRNA but not its translated protein. YB1 overexpression may have promoted PIAS3 mRNA decay, decreasing PIAS3 protein levels, and therefore increased the levels of phosphorylated STAT3. Finally, YB1 knockdown, mediated by a lentivirus carrying YB1 targeted short hairpin RNA, significantly decreased left ventricle percentage fractional shortening and ejection fraction values, while increasing the infarct sizes in a rat model of M‑I/R injury. These results demonstrated for the first time (to the best of our knowledge) that YB1 may protect cardiac myocytes against H2O2 or M‑I/R‑induced injury by binding to PIAS3 mRNA and resulting in the phosphorylation of STAT3.
研究领域:
心脏病学
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分子生物学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-11
·
IF 5.228
Liu Lingmei,Sun Wuzhu,Yang Weiyi,Li Qi,Shang Jian Ku
Most photocatalysts only function under illumination, while many potential applications require continuous activities in dark. Thus, novel photocatalysts should be developed, which could store part of their photoactivity in “memory” under illumination and then be active from this “memory” after the illumination is turned off for an extended period of time. Here a novel composite photocatalyst of SnO 2 nanoparticle-decorated Cu 2 O nanocubes is developed. Their large conduction band potential difference and the inner electrostatic field formed in the p - n heterojunction provide a strong driving force for photogenerated electrons to move from Cu 2 O to SnO 2 under visible light illumination, which could then be released to react with O 2 in dark to produce H 2 O 2 for its post-illumination activity. This work demonstrates that the selection of decoration components for photocatalysts with the post-illumination photocatalytic “memory” could be largely expanded to semiconductors with conduction band potentials less positive than the two-electron reduction potential of O 2 .
研究领域:
材料科学
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纳米技术
·
光催化
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Zhuowen Yang,Ke Feng
The Fe 0 /H 2 O 2 system, which is capable of removing organic matter from wastewater, suffers from limited efficiency because of slow Fe 2+ release and restricted Fe 2+ /Fe 3+ cycling. This study investigated the performance and mechanism of a UV-enhanced Fe 0 /H 2 O 2 system for the removal of organics in semiaerobic aged refuse biofilter (SAARB) effluent from landfill leachate, with HO • identified as the primary reactive oxygen species. UV not only initiates a homogeneous Fenton reaction through direct photolysis of H 2 O 2 and promotes Fe 2+ release from Fe 0 but also accelerates surface corrosion of Fe 0 to form more iron oxides, which react with H 2 O 2 in a heterogeneous Fenton reaction, thereby generating HO • at a faster rate. HO • preferentially reacts with organics containing chromophores or auxochromes, attacks humus with abundant conjugated structures, converts them into smaller organic molecules, and even achieves mineralization. Increasing the Fenton reagent ratio and dosage enhances the removal performance of the UV/Fe 0 /H 2 O 2 system, with optimal organic removal observed under acidic conditions. Ultimately, optimal conditions of the UV power (10 W), Fe 0 (2 mM) and H 2 O 2 (12 mM) dosages at pH 3.0 achieved 84.48% CN, 90.06% UV 254 , and 62.84% TOC removal. This study provides a feasible solution for achieving discharge standards for landfill leachate.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Haiqian Zhao,Ming Dong,Zhonghua Wang,Huaiyuan Wang,Hanbing Qi
Low H2O2 utilization efficiency is the main problem when Fenton system was used to oxidize NO in flue gas. To understand the behaviour of the free radicals during NO oxidation process in Fenton system is crucial to solving this problem. The oxidation capacity of ⋅OH and HO2⋅ on NO in Fenton system was compared and the useless consumption path of ⋅OH and HO2⋅ that caused the low utilization efficiency of H2O2 were studied. A method to enhance the oxidation ability and H2O2 utilization efficiency by adding reducing additives in Fenton system was proposed. The results showed that both of ⋅OH and HO2⋅ were active substances that oxidize NO. However, the oxidation ability of ⋅OH radicals was stronger. The vast majority of ⋅OH and HO2⋅ was consumed by rapid reaction ⋅OH + HO2⋅→H2O + O2 , which was the primary reason for the low utilization efficiency of H2O2 in Fenton system. Hydroxylamine hydrochloride and ascorbic acid could accelerate the conversion of Fe3+ to Fe2+, thereby increase the generation rate of ·OH and decrease the generation rate of HO2⋅. As a result, the oxidation ability and H2O2 utilization efficiency were enhanced.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Guanwei Peng,Yanyu Xie,Hui Chen,Jin Zou,Li Li,Chuanfa Luo,Limin Lu,Guojiang Mao
Photo-Fenton-like technology based on H 2 O 2 is considered as an ideal strategy to generate reactive oxygen species (ROS) for antibiotic degradation, but O 2 overflow in the process severely limits the utilization efficiency of H 2 O 2 . Herein, we fabricate Bi 2 MoO 6 (BMO) photocatalyst modified with Frustrated Lewis pairs (FLPs) as a Fenton catalyst model for enhancing reuse of spilled O 2 . The FLPs created by the introduction of cerium and oxygen vacancy were found to contribute to regulate the electronic structure of BMO and further improve the acidic and basic properties of photocatalyst surface. More importantly, the frustrated acid and base sites can enhance the H 2 O 2 and O 2 interfacial adsorption process and provide an Ce 4+ -O v -O 2− active site on the surface of Ce-BMO nanosheets, which can promote O 2 /•O 2 − / 1 O 2 /H 2 O 2 redox cycles to achieve high H 2 O 2 utilization efficiency. Specifically, in the experiment using tetracycline as a photocatalytic degradation object, the degradation activity of Ce-BMO was 2.15 times higher than that of BMO pure phase. Quenching experiments and EPR assays also confirmed that 1 O 2 and •O 2 − were the dominant oxidative species. This study systematically reveals the design of Fenton photocatalytic active sites at the atomic scale and provides new insights into constructing FLPs photocatalysts with high H 2 O 2 utilization efficiency.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 9
·886-892
·
IF 3.081
Junyu Lei,Xiaofeng Lu,Guangdi Nie,Ziqiao Jiang,Ce Wang
A facile one-pot synthetic route is reported to prepare algae-like molybdenum disulfide/polypyrrole (MoS 2 /PPy) nanocomposite through a redox reaction between ammonium tetrathiomolybdate and pyrrole monomer under a hydrothermal condition without any other templates. The as-prepared unique algae-like MoS 2 /PPy nanocomposites are composed of few layer MoS 2 nanosheets, which are covered with PPy. Structural and morphological characterizations of this unique nanocomposite are investigated by Fourier-transform infrared spectra, Raman spectra, X-ray diffraction pattern, X-ray photoelectron spectra, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The as-prepared MoS 2 /PPy nanocomposites exhibit an excellent peroxidase-like catalytic activity toward the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H 2 O 2 ) in acetate buffer solution (pH 4.0), which provides a facile strategy for the colorimetric detection of H 2 O 2 with a high sensitivity.
研究领域:
材料科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yueli Chen,Huilin Huang,Runying Luo,Aiping Zhang
Landfill leachate contains high levels of refractory organic compounds that pose significant environmental risks. The treatment of landfill leachate through advanced oxidation processes (AOPs) is an effective method for removing these compounds. However, the presence of chloride ions (Cl − ) might lead to the formation of chlorinated organics. In this study, we compared the formation of chlorinated organics during the removal of refractory organic compounds from landfill leachate treated by a membrane bioreactor (MBR) through UV/H 2 O 2 and UV/PDS processes with different oxidant dosages. The relationship between the formation of chlorinated organics and the concentration of organics was explained via ultraviolet visible spectra, three-dimensional excitation and emission matrix spectra, and total organic carbon. The results revealed that the concentration of chlorinated organics increased with increasing oxidant dosage. Under the oxidant dosage of 40 mM and a reaction time of 90 min, the cumulative concentration of the 4 chlorinated organics in the UV/H 2 O 2 process reached 482.8 μg/L, and those of the 8 chlorinated organics reached 34,370.2 μg/L in the UV/PDS process. Concentrations of chloroacetaldehyde, chloroacetic acid and trichloroacetic acid produced in the UV/H 2 O 2 process and concentrations of chloroacetaldehyde, dichloroacetaldehyde and dichloroacetonitrile produced in the UV/PDS process were significantly and positively correlated with the concentrations of aromatic organic compounds. In the UV/H 2 O 2 and UV/PDS processes, the concentration of Cl − affects the conversion of reactive chlorine species, such as Cl • and Cl 2 •– , and the reactive species, such as HO • , SO 4 •– , Cl • and Cl 2 •– generated in the process react with organic compounds to form intermediates through hydrogen extraction, addition and electron transfer processes that gradually open ring structures to form small molecules. Cl • and Cl 2 •– further react with these small-molecule intermediates to form chlorinated organics through chlorine substitution. The toxicity evaluation of chlorinated organics revealed that haloacetaldehydes were the main source of chlorinated organic toxicity in both the UV/H 2 O 2 and UV/PDS processes. This study provides theoretical support for reducing the formation of chlorinated organics during refractory organic compound removal processes from landfill leachate via advanced oxidation processes such as UV/AOPs.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Rongdi Tang,Daoxin Gong,Yaoyu Zhou,Yaocheng Deng,Chengyang Feng,Sheng Xiong,Ying Huang,Guanwei Peng,Ling Li
Herein, a g-C 3 N 4 /PDI-g-C 3 N 4 homojunction has been fabricated for piezo-photocatalytic atrazine removal and exhibited better performance than individual photocatalysis or piezocatalysis. The introduction of PDI induces the π-π interaction facilitating electrons migration, and twists the g-C 3 N 4 plane into a more polar porous structure with enhanced piezoelectricity. The homojunction facilitates the photoelectron transfer at the g-C 3 N 4 /PDI-g-C 3 N 4 interfaces. The photoelectricity and the piezoelectricity of g-C 3 N 4 /PDI-g-C 3 N 4 were assessed. The finite element simulation showed that the porous structure of the g-C 3 N 4 /PDI-g-C 3 N 4 is essential to the enhanced piezoelectricity. Astonishingly, the piezo-photocatalytic atrazine degradation rate under an optimized condition (pH=2.97) reached 94% within 60 min. Moreover, the g-C 3 N 4 /PDI-g-C 3 N 4 homojunction produced 625.54 μM H 2 O 2 during the one-hour piezo-photocatalysis. Given the quenching experiments, reactive species detection and the electronic band of g-C 3 N 4 /PDI-g-C 3 N 4 , the piezo-photocatalytic mechanism has been proposed. In addition, the degradation pathways and the reduced intermediates toxicity intermediates of atrazine have been investigated.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 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）