BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 1
·199-205
·
IF 1.65
Zhang Wanying,Huang Yingnan,Gong Hua,Dang Fei,Zhou Dongmei
Metal dioxide nanoparticles (NPs) are produced in ever-increasing amounts and widely used in industrial, medical and consumer products. They may pose potential risks to the environment. In this study we quantitatively evaluated the phytoavailability of CeO 2 NPs, ZrO 2 NPs and SiO 2 NPs to wheat ( Triticum aestivum L.). Metal dioxide NPs showed distinct differences in uptake, with uptake rate constants of 90.2 ± 9.9, 12.2 ± 2.5, 0.4 ± 0.02 and 0.9 ± 0.1 L kg −1 h −1 for ZrO 2 NPs, CeO 2 NPs, SiO 2 NPs (13 nm) and SiO 2 NPs (25 nm), respectively. However, such difference cannot be generalized by single factor of NP characteristics and/or root damage. This study provides fundamental information for NP uptake by crop plants.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Laijin Zhong,Xin Hu,Zhaoming Cao,Hongwei Wang,Yijun Chen,Hong-zhen Lian
The increasing application of engineered nanoparticles such as silver nanoparticles (nAg) and zinc oxide nanoparticles (nZnO), results in their accumulation in environmental media. The environmental natural organic matter (NOM) adsorbed by these nanoparticles may have great effects on the aggregation and dissolution of metall ions, which are interesting and important for the assessment of the inhalation risks of these airborne suspended NOM-coated nanoparticles to humans. Therefore, the aggregation and dissolution of nAg and nZnO pretreated with citric acid (CA), tartaric acid (TA) and fulvic acid (FA) in simulated lung biological fluids (artificial lysosomal fluid (ALF) and Gamble Solution) were investigated. The surface properties, morphology and size of the NOM-treated ENPs changed, but the crystalline phase was relatively stable when observed using surface-enhanced Raman scattering , transmission electron microscope , and X-ray diffraction. NOM treatment had no significant influence on the particle size of NOM-treated nAg and nZnO except for a decrease in the size of CA-treated nAg, and it could not promote the aggregation of NOM-treated nAg and nZnO except for the aggregation of TA-treated nAg in Gamble Solution or TA-treated nZnO in ALF. CA- and FA-treatments promoted the release of Zn 2+ and Ag + , respectively, while no promotion was observed after TA-treatment. Therefore, NOM affects the release of Zn 2+ and Ag + from NOM-treated nAg and nZnO but does not promote the aggregation of NOM-treated nAg and nZnO, which influences the inhalation risk-based assessment.
研究领域:
环境科学
·
毒理学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2019
·
IF 3.556
Hongyan Sun,Ruyuan Jiao,Hui Xu,Guangyu An,Dongsheng Wang
In order to evaluate the influence of particle size and particle concentration on the coagulation process, two kinds of particle suspensions, nanoparticles and microparticles , were employed to investigate the effect of particle size on coagulation mechanisms with varying coagulation parameters. Results showed that it is easier for nanoparticles to cause self-aggregation because of Brownian motion, while interception and sedimentation are the mainly physical processes affecting particle transport for microparticles, so they are more stable and disperse more easily. The particle size distribution and particle concentration had distinct influence on the coagulation mechanisms. Under neutral conditions, as the amount of coagulant increased, the coagulation mechanism for nanoparticles changed from charge neutralization to sweep flocculation and the nanoparticles became destabilized, re-stabilized and again destabilized. For microparticles, although the coagulation mechanism was the same as that of nanoparticles, the increased rate of aluminum hydroxide precipitation exceeded the adsorption of incipiently formed soluble alum species, resulting in the disappearance of the re-stabilization zone. Under acidic conditions, Brownian motion dominates for nanoparticles at low particle concentrations, while sweep flocculation is predominant at high particle concentrations. As for microparticles, charge neutralization and sweep flocculation are the mechanisms for low and high particle concentrations respectively. Under alkaline condition, although the mechanisms for both nano- and microparticles are the same, the morphology of flocs and the kinetics of floc formation are different. At low particle concentrations, nanoparticles have larger growth rate and final size of flocs, while at high particle concentrations, nanoparticles have higher fractal dimension and recovery factors.
研究领域:
环境科学
·
化学工程
·
胶体与表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Jin-Tao Du,Meng Qiao,Yuan Pu,Jie-Xin Wang,Jian-Feng Chen
The reduction of nitroarenes is usually catalyzed by heterogeneous catalysts. In this work, highly stable aqueous dispersions of monodisperse Pt, Pd, and Au nanoparticles stabilized by thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), are conveniently synthesized with the average sizes of 2.3, 3.1, and 2.3 nm, respectively. The modulation of the hydrophilic-hydrophobic nano-environments of the catalysts can be selectively provided by utilizing the temperature-responsive characteristics of PNIPAM. They are effective and thermosensitive pseudohomogeneous catalysts for nitroarenes reduction. The decreasing trend of catalytic activity is as follows: PNIPAM-Au > PNIPAM-Pd > PNIPAM-Pt. The catalytic reduction of nitrobenzene (NB), 4-nitrophenol (4-NP), and o-nitroaniline (o-NA) follow the pseudo-first-order kinetics, and the catalytic rates can be tuned by utilizing their temperature-responsive behavior. PNIPAM-Au nanocatalysts exhibit high turnover frequencies (TOF) up to 84, 12.9, and 40 min −1 for catalytic reduction of NB, 4-NP, and o-NA at 20 °C, respectively, which are one of the highest values ever reported.
研究领域:
化学
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 4
·1-17
·
IF 2.9
Huang Juan,Qian Xiuwen,Li Xuan,Hu Qian,Cao Chong,Yan Chunni
Increasing consumption of nanoparticles (NPs) led to their accumulation in environment like soil, causing public anxiety to their hazards. In this study, dynamic impacts of three NPs (silver (Ag), zinc oxide (ZnO), and fullerene (C 60 )), and their derivatives on soil were evaluated along time. Different influences caused by category and concentration were also compared. As results demonstrated, Ag NPs and Ag + brought more evident toxicity on soil enzymes than others, in which dehydrogenase exerted the most sensitivity. Such stress to enzymes was dose-dependent in groups of Ag NPs, Ag + , and C 60 OH. Two-way ANOVA reveled the interaction of concentration and category on enzymes between different groups. More significant reduction of bacterial density and alterations of bacteria community were observed with Ag NPs treatment. Nitrogen transformation was suppressed by various NPs, via inhibition on related bacteria including Flavobacterium and Nitrospira . Existence of time effect on bacteria was also confirmed. In brief, metal NPs and their dissolved ions could pose stronger threats to soil microenvironment compared to metal oxide and carbon-based NPs, and their derivatives. These results provide comprehensive evidence for effects of NPs on soil, which could generate new leads on secure application of them.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jia Ke,Yingnan Zhu,Jiamin Zhang,Jing Yang,Hongshuang Guo,Weiqiang Zhao,Chiyu Wen,Lei Zhang
Silk is an attractive natural fiber due to its excellent mechanical properties and biocompatibility. Xenobiotic modification of pristine silk is gaining significant attention to meet specific demands. The silk payload of xenobiotics is affected by their uptake efficiency, biodistribution, metabolism, and excretion. Herein, we systematically evaluated the effect of the nanoparticle size (20–100 nm) on the biodistribution and silk production by introducing silver nanoparticles (AgNPs) into the silkworm diet. Interestingly, the silk payload of AgNPs is highly dependent on their overall size, where 50 nm AgNPs are prone to accumulate in silk glands and reveal the highest content in the produced silk, qualifying silk antibacterial activity against both Gram-positive and Gram-negative bacteria. These findings provide new insights to understand how nanoparticle properties influence the incorporation of nanomaterials into silk and can help optimize the material design.
研究领域:
生物材料学
·
纳米生物学
·
昆虫学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 17
·8024-8029
·
IF 7.79
Wei Bing,Faming Wang,Yuhuan Sun,Jinsong Ren,Xiaogang Qu
Herein, an environmentally friendly biomimetic strategy was proposed and validated for the catalytic hydrogenation reaction in live bacteria. First, we used a thermophilic hydrogen-producing bacterial strain to in situ prepare ultrafine gold nanoparticles (AuNPs) and palladium nanoparticles (PdNPs). Then, by utilizing AuNPs or PdNPs as catalysts and on-site hydrogen gas generated directly through living thermophilic hydrogen-producing bacteria, we realized highly efficient asymmetric hydrogenation reactions.
研究领域:
微生物学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 19
·期 1
·72-79
·
IF 3.849
Tao Yang,Jianmei Liu,Jinhui Dai,Yongsheng Han
Here, we report a general role of chemical diffusion and reaction in shaping particles. It is supposed that chemical diffusion and reaction play a role in shaping particles by changing the chemical distribution around the growth front of particles. Based on this understanding, three growth modes of particles are proposed in this paper, namely, reaction-limited mode, diffusion-limited mode, and reaction–diffusion balance mode. Silver particles are synthesized in different growth modes by various methods. No matter which method is employed, silver particles synthesized in the same mode have similar morphologies. To further generalize diffusion and reaction effects, copper and gold particles are synthesized. The morphological evolution of these two types of particles is similar to that of silver. These results indicate the general role of chemical diffusion and reaction in shaping particles, promising that a regulation on these two kinetic factors is a green and powerful technique for rational synthesis of materials.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Zhihai Cao,Qun Chen,Hangnan Chen,Zhijie Chen,Jia Yao,Shuning Zhao,Yushan Zhang,Dongming Qi
Polymeric/inorganic nanocomposite particles (NCPs) were tentatively prepared through miniemulsion polymerization using sodium dodecyl sulfate (SDS) as the sole surfactant. The representative inorganic nanoparticles (NPs), SiO 2 NPs, were pre-dispersed in monomer solutions. Particle morphology and size of the latex particles in the emulsions prepared from miniemulsions were investigated in terms of the SiO 2 and SDS content. The results indicate that the number fraction of polymer/SiO 2 NCPs ( f NCP ) in the latex particles was below 4%, and that plain polymer particles dominated in all of the emulsions regardless of the SiO 2 and SDS content when the sonication power was 95 W. The centrifugation experiments showed that there were three types of particles in the emulsions, namely, a dominant amount of plain polymer particles, a small amount of polymer/SiO 2 NCPs, and a very small amount of sub-micrometer polymer/SiO 2 aggregates. These particles evolved from small plain monomer droplets, medium monomer droplets containing SiO 2 NPs, and micrometer monomer droplets containing many SiO 2 NPs, respectively. Formation mechanisms of these three types of particles were proposed. On the basis of the mechanism, we used higher sonication power to improve the homogeneity of the number distribution of SiO 2 NPs among monomer droplets. The f NCP value markedly increased to ∼39% upon increase of the sonication power to 190 W. However, the formation efficiency of polymer/SiO 2 NCPs could not be improved with further increase of the sonication power.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 5
·1-15
·
IF 2.009
Wang Chao,Lv Bowen,Hou Jun,Wang Peifang,Miao Lingzhan,Ci Hanlin
The cerium dioxide nanoparticle (CeO 2 NP) (122 nm) aggregation process was investigated by nanoparticle tracking analysis (NTA), and the results were compared with those of dynamic light scattering (DLS). Unlike descriptions based on classical aggregation kinetics theory, the size distributions obtained by NTA and DLS show that aggregation of NPs in an aquatic environment is a complicated process and highly dependent on the particle number concentration, which is information that has been rarely presented in the literature. In particular, not all the particles were aggregated and there still remained some small CeO 2 NPs (< 400 nm), which has potential adverse environmental risks to the ecosystem and public health. Furthermore, the aggregate sizes are far smaller than previously shown in aggregation kinetics experiments. In addition, our findings also indicate that NTA can measure samples with mass concentrations ranging from 0.1 to 100 mg/L without dilution. In contrast, DLS cannot provide accurate information about aggregation kinetics when the mass concentration of CeO 2 NPs is lower than 1 mg/L (2.02 × 10 8 ± 1.66 × 10 7 by NTA data). Consequently, the classical aggregation kinetics experiment using DLS cannot accurately reflect the fate of NPs in aquatic environment, especially the heteroaggregation of NPs in complex water phase, and these results further demonstrate that the toxicity evaluation of NPs concerning different sizes measured by DLS need more rigorously experimental design. Therefore, our findings provide the first quantitative attempt to explore the experimental conditions and analytical methods for further study of aggregation kinetics.
研究领域:
环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 6
·3222-3227
·
IF 1.938
Han Wensong,Guo Qin,Su Tianhui
Cu@HBP-SH@Ag particles have been prepared by a facile synthesis strategy. Initially, thiol-terminated hyperbranched polymer (HBP-SH) was synthesized by stepwise polymerization. Subsequently, Cu particles covered with HBP-SH were prepared by reduction technology using HBP-SH as dispersant and template. Finally, Cu@HBP-SH@Ag particles were obtained by reduction reaction. Fourier-transform infrared (FT-IR) and ultraviolet–visible (UV–Vis) spectroscopy confirmed presence of HBP-SH on the surface of the Cu particles. The crystal structure was examined by x-ray diffraction (XRD) analysis. Scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS) analysis confirmed formation of Cu@HBP-SH@Ag particles. Thermogravimetric analysis (TGA) showed that the Cu@HBP-SH@Ag particles had better antioxidation properties than the Cu particles.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Wen-Jing Wei,Yuan Yang,Xin-Yuan Li,Peng Huang,Qiang Wang,Ping-Jian Yang
Silver Nanoparticles (Ag-NPs), an emerging type of pollutant, might occur various physical and chemical transformations, which would affect its environmental fate, transformation and biological effects. Sulfurization is the most common conversion of Ag-NPs, accompanied by the formation of nano-silver sulfide (Ag 2 S-NPs). The method of Ag 2 S-NPs analysis and characterization is of great significance for assessing the environmental risks of Ag. In this study, cloud point extraction (CPE) and Single Particle-Inductively Coupled Plasma-Mass Spectrometry (SP-ICP-MS) were used in combination to establish a simple and reliable analysis method to quantify Ag 2 S-NPs in water, with the morphology unchanged. Non-Ag 2 S-NPs were dissociated into Ag + firstly, and Ag 2 S-NPs and Ag + were separated by CPE, followed by SP-ICP-MS analysis. The extraction rate based on particle number concentration was between (76.19 ± 0.56) % to (106.35 ± 0.00) % in environmental waters. Compared with the (76.96 ± 2.18) nm Ag 2 S-NPs spiked, the particle size extracted increased slightly with (94.19 ± 2.72) nm- (97.25 ± 0.22) nm as the large-size Ag 2 S-NPs originally presented in waters, instead of agglomeration. This method could be generally applicable to the analysis of Ag 2 S-NPs in waters, and provide ideas for other metal sulfide nanoparticles (MS-NPs), which has certain significance.
研究领域:
环境科学
·
分析化学
✓ 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）