SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
研究领域:
环境科学
·
微生物学
·
土壤学
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产品关联
DOI
PubMed
高影响因子
Environmental Chemistry Letters
·
2017
·Vol. 16
·期 1
·251-264
·
IF 3.594
Yein Win Thi,Wang Qun,Feng Xueying,Li Yang,Wu Xiaohong
Nanocomposites composed of two or more components with desirable performance have attracted tremendous attention, mainly due to the synergic effect between the components. The effective combination of ZnO and reduced graphene oxide would lead to ameliorate the photocatalytic performance. To enhance applicability of semiconductor photocatalytic, the composites used should be good interfacial contact governed by suitable particle size distribution. Herein we aim to fabricate the different crystallize size of ZnO nanoparticles (NPs) in ZnO–reduced graphene oxide (ZnO–rGO) nanocomposites by sonochemical synthesis and subsequent facile drying treatment method. The Zn precursor, Zn(Ac) 2 , with a plenty of functional groups, was used as a starting source for both reduction of graphene oxide and formation of ZnO on rGO sheets through chemical bonds without the addition of hazardous reducing agents. LiOH was chosen as an assistive reagent to enhance the complete reaction between Zn(Ac) 2 and GO in the formation of ZnO–rGO nanocomposites. More remarkably, drying condition has the great influence on the crystallize size of ZnO NPs in as-prepared ZnO–rGO nanocomposites. It is found that ZnO–rGO nanocomposites dried at −50 °C (freeze drying) show the highest photocatalytic efficiency in the degradation of rhodamine B (RhB) as compared to ZnO–rGO nanocomposites by other drying conditions under visible-light irradiation. Correlating the crystallize size obtained by different drying temperatures with the photocatalytic activity, it is probed that the smaller crystallize size in ZnO–rGO nanocomposites enhances the interfacial contact and a chemical bonding between rGO and ZnO NPs leading to the effective separation of electrons and holes. In addition, the O
·− 2
anion was determined to be the main active oxidant by free radicals trapping experiment and a photodegradation mechanism of ZnO–rGO nanocomposites over rhodamine B (RhB) was proposed based on our observations.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 11
·1067-1073
·
IF 0
Wu Wenwen,Wang Sui
In this work, we reported a luminol electrochemiluminescence (ECL) sensor using a composite material compounded by ZnO nanoparticles and reduced graphene oxide (ZnO/RGO) as electrode membrane and in situ generated hydrogen peroxide as coreactant. The composite material was characterized
by fourier transform infrared spectroscopy analysis (FTIR) and X-Ray powder diffraction (XRD). Then this ZnO/RGO modified electrode was used to determine tetracaine hydrochloride (TA· HCl). Results show that the inhibition of ECL intensity increased with logarithm of TA · HCl
concentration within a linear range from 10–4
μg/mL to 10–2
μg/mL and the detection limit (S/N) was 3.3 × 10–5
μg/mL. In addition, the recoveries of real samples were 85.0%–104.0% (urine),
95.0%–127.4% (serum) and 87.0%–104.6% (raw material drug) respectively, demonstrating an acceptable reproducibility of this method.
研究领域:
分析化学
·
药物分析
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Fei Li,Li Zhuang,Wenwei Zhan,Manxi Zhou,Gang Sui,Aosong Zhou,Gang Bai,Wei Xiao,Xiaoping Yang
ZnO decorated ZnFe 2 O 4 nanoparticles were synthesized and combined with reduced graphene oxide (rGO) to form ZnFe 2 O 4 @ZnO@rGO ternary hierarchical nanocomposites by a controllable method. The microstructure, morphology, and microwave absorption performance of the ZnFe 2 O 4 @ZnO@rGO nanocomposites were investigated in detail. The permittivity and permeability of the composites can be effectively regulated by controlling the content of ZnO and rGO to achieve a good impedance matching. Due to the synergistic effect of dielectric loss and magnetic loss, the ZnFe 2 O 4 @ZnO@rGO nanocomposites exhibited strong wave absorption and wide absorption bandwidth. The optimal reflection loss (RL) of the ZnFe 2 O 4 @ZnO@rGO nanocomposites reached −35.2 dB at 12.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 3.7 dB. The ZnFe 2 O 4 @ZnO@rGO hierarchical architecture produced lots of heterogeneous interfaces which made a significant contribution to the wave absorption performance. The combination of interfacial polarization, dipole polarization, and eddy current loss enhanced the microwave absorption capacity of the ZnFe 2 O 4 @ZnO@rGO system. This work provides a feasible approach for the design and preparation of wave absorption materials with tunable permittivity and permeability.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Meiyu Yuan,Changxin Peng,Junjie Fu,Xuening Liu,Zihan Wang,Shiyu Xu,Sheng Cui
Accurate and convenient detection of nitrogen dioxide (NO 2 ) in the air, which is harmful to human health, is vital. However, it is difficult for many NO 2 detection devices to achieve high sensitivity at room temperature. In this work, we synthesized zeolite-imidazolate-frameworks-8 (ZIF-8) nanoparticles and zinc oxide/reduced graphene oxide (ZnO/rGO) aerogel by low-temperature synthesis and sol-gel method. The aerogel composite materials were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Brunaue-Emmette-Teller (BET), and Raman spectroscopy . The gas-sensitive element prepared by the material with the mass ratio ZIF-8 to rGO is 5:1 possesses excellent selectivity and higher sensitivity (3.21) to 100 ppm NO 2 at room temperature. Reduced graphene oxide (rGO) provides more gas transmission and diffusion channels for improving sensitivity because of a three-dimensional porous structure. When NO 2 is exposed, electrons transfer into p-n heterostructure formed by rGO and ZnO composite to achieve the purpose of sense. In this study, the material preparation method is relatively simple and efficient, which is of profound significance to accurately detect the variation of NO 2 concentration in air at room temperature.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·917
·
IF 5.3
Donglin Li,Junfeng Lu,Xuanji Zhang,Dingfeng Jin,Hongxiao Jin
Nanoscale heterostructured zinc oxide/reduced graphene oxide (ZnO/rGO) materials with p–n heterojunctions exhibit excellent low temperature NO2gas sensing performance, but their doping ratio modulated sensing properties remain poorly understood. Herein, ZnO nanoparticles were loaded with 0.1~4% rGO by a facile hydrothermal method and evaluated as NO2gas chemiresistor. We have the following key findings. First, ZnO/rGO manifests doping ratio-dependent sensing type switching. Increasing the rGO concentration changes the type of ZnO/rGO conductivity from n-type (<0.6% rGO) to mixed n/p -type (0.6~1.4% rGO) and finally to p-type (>1.4% rGO). Second, interestingly, different sensing regions exhibit different sensing characteristics. In the n-type NO2gas sensing region, all the sensors exhibit the maximum gas response at the optimum working temperature. Among them, the sensor that shows the maximum gas response exhibits a minimum optimum working temperature. In the mixed n/p-type region, the material displays abnormal reversal from n- to p-type sensing transitions as a function of the doping ratio, NO2concentration and working temperature. In the p-type gas sensing region, the response decreases with increasing rGO ratio and working temperature. Third, we derive a conduction path model that shows how the sensing type switches in ZnO/rGO. We also find that p–n heterojunction ratio (np–n/nrGO) plays a key role in the optimal response condition. The model is supported by UV-vis experimental data. The approach presented in this work can be extended to other p–n heterostructures and the insights will benefit the design of more efficient chemiresistive gas sensors.Keywords:p–n junctions;ZnO;reduced graphene oxide;rGO;NO2sensing
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-15
·
IF 2.8
Suguna A.,Parthibavarman M.,Sridevi C.,Al-Mohaimeed A. M.,Al-onazi W. A.
New ternary nanocomposites for photocatalysis, composed of ZnFe 2 O 4 @ZnO@rGO, were synthesised in this work using a straightforward hydrothermal method. After characterising the samples' structures, morphologies, and photoelectric outcomes, researchers found that 25–30 nm ZnFe 2 O 4 @ZnO nanoparticles were securely attached to the surface of the rGO sheets' fibres. The photocatalytic activity in the deterioration of rhodamine B (RhB) was much enhanced by the ZnFe 2 O 4 @ZnO@rGO composite photocatalysts when compared to ZnO, ZnFe 2 O 4 , and ZnFe 2 O 4 @ZnO. With a degradation efficiency of 99.9% for RhB and 88.7% for MB after 60 min of ultraviolet (UV) radiation, the ZnFe 2 O 4 @ZnO@rGO composite photocatalyst stood out as the most active photocatalyst. In addition, this nanocomposite exhibited excellent adaptability for use in water treatment, since it could be magnetised apart and maintained a dye removal percentage of about 100% after eight cycles. Analysis of the photodynamic response and TRPL spectra further verified that the manufactured ternary composite had improved charge transfer efficiency. The synergy of multicomponent ternary nanocomposites may have contributed to the enhanced performance by increasing absorption capacities automatically, discouraging the reconsolidation of electron–hole couples, and inducing the photodeveloped separation of proteins.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2024
·
IF 2.1
Liu Zitong,Liu Jiali
Green water-based paint cannot exhibit antibacterial property. For good antibacterial property, ZnO/reduced graphene oxide (rGO) nanofiller was added. Graphene oxide and ZnO/rGO composite were synthesized. Then, ZnO/rGO/paint composite coating with excellent antibacterial property was prepared. As ZnO content in ZnO/rGO filler is increased, antibacterial property of coating is improved. In fighting against Escherichia coli and Staphylococcus aureus , pristine coating shows low antibacterial rates of 0.50% and 0.48%, respectively. When ZnO was added, antibacterial rates of coating were be increased to 49.31% and 41.67%. When ZnO/rGO filler was used, antibacterial rates were increased to 65.46% and 62.17%. At a higher load of ZnO/rGO filler, antibacterial rates reached 93.37% and 83.38%. Friction coefficient of ZnO/rGO/paint composite coating was decreased to 0.53 compared with original coating. At a higher dose of ZnO/rGO filler, friction coefficient was decreased to 0.40. Properties of ZnO/rGO/paint coating meet a national standard for water-based wood coatings for indoor decoration. This composite coating with excellent antibacterial property and wear resistance can be applied in eco-friendly indoor decoration.
研究领域:
材料科学
·
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Hao Jiang,Xia Zhang,Wen Gu,Xiaoqian Feng,Lei Zhang,Yijin Weng
Novel ZnO particles with hierarchical and biomorphic porous microstructures were first synthesized through a bionic method and the individual ZnO, pine cones-like ZnO/rGO composites were prepared via ‘one-pot’ solvothermal route. All of above samples are characterized by SEM, XRD, Raman spectrometer and XPS. The results of degradation of rhodamine B indicated that ZnO/leaf exhibited better photocatalytic properties than individual ZnO, the ZnO/rGO with ZnO/rGO ratios at 20:1 shows the best photocatalytic performance. Results indicate that both the morphology design of ZnO through a bionic method and graphene doping can enhance the photocatalytic performance of zinc oxide.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Peng Nian,Lu Peng,Jingwei Feng,Xiangxiang Han,Binhua Cui,Songsheng Lu,Jie Zhang,Qiong Liu,Aiyong Zhang
The feasibility of methylparaben (MeP) degradation in aqueous solution by dielectric barrier discharge induced non-thermal plasma combined with zinc oxide-reduced graphene oxide (ZnO-rGO) nanosheets was investigated. The ZnO-rGO nanosheets were synthesized by hydrothermal method and characterized by X-ray diffraction, nitrogen adsorption-desorption isotherm, scanning electron microscope, transmission electron microscope, UV–vis absorption spectroscopy, photocurrent, photoluminescence spectroscopy and X-ray photoelectron spectroscopy. The effects of various factors (discharge power, initial concentration of MeP, initial pH value and air flow rate) on the degradation of MeP were evaluated and the changes of solution pH, conductivity and TOC during the degradation process were discussed. The results showed that when the discharge power was 20 W, the airflow rate was 20 L/h, the ZnO-rGO nanosheets dosage was 0.015 g/L, the initial concentration of MeP was 20 mg/L, and the initial pH value was 7.0, the degradation efficiency of MeP achieved 99% at 15 min. The adding of ZnO-rGO nanosheets to the non-thermal plasma system greatly enhanced the degradation efficiency of MeP. In addition, the role of some reactive species during the degradation process of MeP was also investigated. The degradation process of MeP was well fitted by the pseudo-first-order kinetics. Good stability of the synthetic ZnO-rGO was observed. The degradation intermediates of MeP were determined by gas chromatography-mass spectrometer and the degradation pathways were proposed. Under the attack of reactive species, conjugated structure destruction, hydroxylation, carboxylation and ring-opening reaction occurred during MeP degradation, resulting in the formation of organic acids and alcohols; furthermore, some of the degradation intermediates were mineralized to H 2 O and CO 2 .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Jie Dong,Laixi Zhang,Wei Li,Xin Hu,Anyi Chen,Chaorui Li
In this study, a facile and cost-effective hydrothermal synthesis method was used to synthesize zinc oxide nanoflowers modified by reduced graphene oxide, and subsequently, trimetallic AuPtRu nanoparticles(AuPtRuNPs) were supported via the reduction method for high-sensitivity colorimetric detection of H2O2 in weakly acidic solutions. Compared to monometallic and bimetallic nanoparticles, trimetallic nanoparticles exhibit significant synergistic effects and enhanced catalytic activity. After providing a three-dimensional structure with multiple pores by zinc oxide and enhancing electron transfer ability by reduced graphene, the trimetallic nanocomposites (AuPtRu/ZnO-rGO) exhibited excellent peroxidase-mimicking activity, which can effectively catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a blue oxidation product (oxTMB) in the presence of H2O2. Compared to horseradish peroxidase (HRP), AuPtRu/ZnO-rGO demonstrated significantly enhanced catalytic velocity (Vmax = 6.16 × 10–8 M/s) and affinity (Km = 0.02) for H2O2. The study of the catalytic mechanism showed that trimetallic Au, Pt, and Ru could effectively catalyze H2O2 to produce hydroxyl radicals (•OH) to accelerate the oxidation of TMB and enhance the peroxidase-mimicking activity of the AuPtRu/ZnO-rGO nanocomposites. The results showed that the as-synthesized hydrangea-like AuPtRu/ZnO-rGO nanocomposites showed enhanced peroxidase-mimicking activity. It could be used for the colorimetric detection of H2O2 in the range 5–1000 μM with a LOD of 3.0 μM (S/N = 3), and the recoveries are 93.0–101.7%. In addition, the AuPtRu/ZnO-rGO nanocomposites have good applicability for sensitive colorimetric determination of H2O2 in milk, and it has broad application prospects as a multifunctional sensing platform in the food processing industry.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
生物催化
·
环境科学
✓ 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）