ENVIRONMENTAL POLLUTION
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2019
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IF 5.714
Jiahui Zhu,Ziheng Zou,Yu Shen,Jinfeng Li,Shengnan Shi,Shuwen Han,Xinhua Zhan
Polycyclic aromatic hydrocarbons and zinc oxide nanoparticles are ubiquitous pollutants in the environment. However, little information is available about their toxicity interaction in food crops. In this study, seed germination and hydroponic experiments were conducted to assess the impact of ZnO (NPs and bulk at 250, 500 and 1000 mg L −1 ) individual and combined with phenanthrene (1 mg L −1 ) on wheat growth for 15 days. Under ZnO (NPs and bulk) alone and combined with phenanthrene exposure, dose-dependent toxicity in some indexes (germination rate, biomass, shoot height, root length) was observed. Both ZnO NPs and bulk inhibited plant growth at high concentrations, but no significant difference was observed between them ( P > 0.05). The chlorophyll concentration of wheat leaves decreased by 0.43–0.60 fold when the levels of ZnO NPs and bulk treated were elevated. There was a negative correlation between ZnO (NPs and bulk) and total chlorophyll. Hill reaction activity also exhibited the same tendency. Through transmission electron microscopy , ZnO NPs were found in wheat seedling root apoplast and symplasm at 1000 mg L −1 with or without phenanthrene. High doses (500 and 1000 mg L −1 ) of ZnO (NPs and bulk) caused more DNA damage to wheat seedling root cells, and ZnO NPs induced stronger genotoxicity than bulk ones to wheat root cells. Superoxide dismutase (SOD) and catalase (CAT) activities of wheat seedling roots decreased at 1000 mg L −1 ZnO (NPs and bulk), especially in the co-exposure treatments. Hence, ZnO (NPs and bulk) combined with phenanthrene cause more damage to wheat seedling roots, and even destroy the antioxidant system. Our findings are helpful for not only assessing the individual and combined toxicity between phenanthrene and ZnO (NPs and bulk), but also for understanding the different response of plants to individual and combined pollution.
研究领域:
植物毒理学
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纳米毒理学
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环境污染
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农业科学
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生态毒理学
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INORGANIC CHEMISTRY
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2023
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IF 4.6
Wen-Xiong Shi,Ru-Zhen Ren,Yao Cheng,Fu-Gui Zeng,Xiang-Wei Guo,Zhi-Ming Zhang
Metal–organic framework (MOF) materials have broad application prospects in catalysis because of their ordered structure and molecular adjustability. However, the large volume of bulky MOF usually leads to insufficient exposure of the active sites and the obstruction of charge/mass transfer, which greatly limits their catalytic performance. Herein, we developed a simple graphene oxide (GO) template method to fabricate ultrathin Co-metal–organic layer (2.0 nm) on reduced GO (Co-MOL@r-GO). The as-synthesized hybrid material Co-MOL@r-GO-2 exhibits highly efficient photocatalytic performance for CO2 reduction, and the CO yield can reach as high as 25,442 μmol/gCo-MOL, which is over 20 times higher than that of the bulky Co-MOF. Systematic investigations demonstrate that GO can act as a template for the synthesis of the ultrathin Co-MOL with more active sites and can be used as the electron transport medium between the photosensitizer and the Co-MOL to enhance the catalytic activity for CO2 photoreduction.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Xiaoxiao Hao,HongGuang Sun,Yong Zhang,Shiyin Li,Zhongbo Yu
Contaminants can co-exist and migrate together in the environment, causing complex (and sometimes unexpected) transport dynamics which challenge the efficient remediation of individual contaminants. The co-transport dynamics, however, remained obscure for some contaminants, such as arsenic and micro/nano-plastics (MNPs). To fill this knowledge gap, this study explored the co-transport dynamics of arsenic and MNP particles in saturated soil by combining laboratory experiments and stochastic model analysis. Isothermal adsorption and sand column transport experiments showed that the adsorption of arsenic by MNP particles followed the Freundlich model, with a maximum adsorption of 2.425 mg/g for the MNP particles with a diameter of 100 nm. In the presence of MNP particles, the efflux concentration of arsenic ions declined due to adsorption, where the decline rate decreased with the increasing MNP size and increased with the increasing adsorption capacity. Experimental results also showed that the 100 nm nano-plastic particles prohibited arsenic transport in saturated sand columns, while the 5 μm microplastics enhanced arsenic transport due to electrostatic adsorption and media pore plugging. A tempered time fractional advective-dispersion equation was then proposed to quantify the observed breakthrough curves of arsenic. The results showed that this model can reliably capture the co-transport behavior of arsenic with MNPs in the saturated soil with all coefficients of determination over 0.97, and particularly, the small MNP particles facilitated anomalous transport of arsenic. This study therefore improved the understanding and quantification of the co-transport of arsenic and MNPs in soil.
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JOURNAL OF CONTROLLED RELEASE
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2023
·
IF 10.8
Qian Zhou,Tengjiao Wang,Kunpeng Li,Shanyu Zhang,Kun Wang,Weilin Hong,Rongjun Liu,Peng Li
Biofilm-associated infections (BAI) have posed serious threats to public health. Novel therapy based on carbon monoxide (CO) is being increasingly appreciated. However, CO therapy like inhaled gas treatment was impeded owing to its low bioavailability. Besides, the direct use of CO releasing molecules (CORM) showed low therapeutic efficacy in BAI. Therefore, it is vital to improve the efficiency of CO therapy. Herein, we proposed polymeric CO releasing micelles (pCORM) from self-assembly of amphiphilic copolymers containing CORM bearing block as hydrophobic part and acryloylmorpholine block as hydrophilic part. The catechol modified CORM were conjugated through pH cleavable boronate ester bonds and releasing CO passively under biofilm microenvironment. When combined with subminimal inhibitory concentration antibiotic amikacin , pCORM could significantly enhance its bactericidal efficiency against biofilm-encapsulated multidrug-resistant bacteria, representing a promising approach to combat BAI.
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Frontiers in Environmental Science
·
2023
·
IF 4.6
Gu Yurong,Zhang Yi,Jiang Chengchun,Dong Zijun,Bai Xue
UV/sulfite process without oxygen has been extensively explored and used for the degradation of many micro-pollutants. In the present work, a UV/sulfite process in the presence of oxygen was applied to degrade a widely used pharmaceutical compound, metformin (MET). The results showed that the oxygen-involved UV/sulfite process could efficiently degrade MET. At an initial concentration of 2.5 mg/L, 86.0% of MET was removed from the contaminated water within 180 min irradiation at a sulfite dosage of 10 mM, solution pH of 9, and UV intensity of 4,092 μW/cm2. In addition, sulfate radical (SO4•-), hydroxide radical (•OH), hydrogen atom (•H), and hydrated electron (eaq−) were found to be the dominant active species contributing to MET removal in the studied process through scavenging experiments. The increase in UV intensity, sulfite dosage, solution pH, and reaction temperature enhanced MET degradation in the investigated process to a certain extent, whereas the introduction of bicarbonate and fulvic acid slightly suppressed MET degradation. Finally, the degradation products of MET were identified. The oxygen-involved UV/sulfite process exhibited a remarkable denitrification capacity (>80%) in MET. The findings of this study may offer a novel approach for treating emerging contaminants.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2023
·Vol. 332
·期 2
·289-296
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IF 1.6
Zhang Fucheng,Yuan Xin,Fu Dengjiang,Zhou Li,Huang Pengling,Chen Tao
Tailoring the band structure of photocatalysts by elemental doping to enhance redox ability and carrier separation kinetics is a promising strategy for designing high-efficiency catalysts for uranium (U(VI)) photoreduction. Herein, we report enhanced visible-light spectral absorption by tuning the energy bandgap of flower-like ZnO microspheres by doping Co. Accordingly, Co doping narrows the bandgap and increases the photogenerated carrier concentration, thereby promoting the U(VI) photocatalytic reduction. Especially, the removal ratio of U(VI) by Co-doped ZnO microspheres reaches 98.4% with a remarkable adsorption capacity of 1645 mg/g for U(VI) uptake in 400 ppm U(VI) solution. In addition, the Co-doped ZnO microspheres present desired U(VI) reduction ratio in a wide range of U(VI) concentrations, as well as excellent reusability, and resistance to ion interference during photocatalysis. This paper provides a feasible strategy for enhancing the photocatalytic reduction of uranium by introducing metal element doping on the metal oxide surface. Graphical abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jiang Zhao,He Liangrui,Yang Zhiwen,Qiu Huibin,Chen Xiaoyuan,Yu Xujiang,Li Wanwan
Distinctive upconversion or downshifting of lanthanide nanocrystals holds promise for biomedical and photonic applications. However, either process requires high-energy lasers at discrete wavelengths for excitation. Here we demonstrate that co-sensitization can break this limitation with ultrawide excitation bands. We achieve co-sensitization by employing Nd 3+ and Ho 3+ as the co-sensitizers with complementary absorptions from the ultraviolet to infrared region. Symmetric penta-layer core-shell nanostructure enables tunable fluorescence in the visible and the second near-infrared window when incorporating different activators (Er 3+ , Ho 3+ , Pr 3+ , and Tm 3+ ). Transient spectra confirm the directional energy transfer from sensitizers to activators through the bridge of Yb 3+ . We validate the features of the nanocrystals for low-powered white light-emitting diode-mediated whole-body angiography of mice with a signal-to-noise ratio of 12.3 and excitation-regulated encryption. This co-sensitization strategy paves a new way in lanthanide nanocrystals for multidirectional photon conversion manipulation and excitation-bandwidth-regulated fluorescence applications.
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Journal of Energy Storage
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2023
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IF 9.4
Tingting Dai,Xuesong Li,Liying Wang,Xijia Yang,Yang Gao,Qixian Zhang,Wei Lü
Ni-Co-O material is the most representative polymetallic compound and has exhibited excellent energy storage properties. However, the high cost of composite restricts the practical application of Ni-Co-O material. In this paper, a simple and low-cost method is used to grow Ni-Co-O/C nanoarrays directly on a conductive matrix. The results show that the three-dimensional nanoflower-like Ni-Co-O/C composite has better electrochemical performance than that of the nanosheet Co-O/C binary composite. This microstructure provides a shorter path for electron transport, making the material high electron transport efficiency. The specific capacitance of Ni-Co-O/C/AC asymmetric supercapacitor can reach 128.75 mF cm −2 at 2 mA cm −2 . Under the condition of 20 mA cm −2 , after 4000 cycles of charge and discharge, the capacitance retention rate is maintained at 99.8 %. This 3D flower-like structure not only helps provide an open framework and rapid ion diffusion, but also exposes more active sites and enhances charge storage performance. Ni-Co-O/C calcined in nitrogen shows more abundant defect structure and larger specific surface area, which is further conducive to Ni-Co-O/C electrodes to expose more active sites and enhance the rapid diffusion and reaction of electrolyte ions .
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-11
·
IF 2.8
Chen Fanfan,Xiao Yao,Yan Sitong,Fang Lin,Wang Zhifen,Liao Jianhe
Modifying natural rubber latex (NRL) and blending it with NRL can improve NRL performance and expand application fields. The performance of co-blended latex will change due to changes in non-rubber components during storage. Therefore, it is important to study the change of properties during the storage of co-blended latexes. In this paper, 30% methyl methacrylate grafted natural rubber (MG30) was synthesized by cumene hydroperoxide/ tetraethylenepentamine (CHPO/TEPA) initiating system, MG30 and NRL were mixed in different proportions to study the morphology and physical and mechanical properties, and the colloidal properties and emulsion properties of co-blended latexes were studied during storage. The results showed that the mechanical stability of NRL and co-blended latexes were high and the viscosity gradually increased during storage. The study of the vulcanization characteristics of the co-blended latexes films and the physical and mechanical properties of the vulcanized latex films showed that the vulcanization time of the co-blended films increased and the torque value increased in comparison to NRL. With the increase of MG30 content, the tensile strength and tear strength of the co-blended latexes vulcanized films showed a trend of increasing and then decreasing, and the co-blended film with 10% MG30 showed the best mechanical properties.
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CELLULOSE
·
2023
·Vol. 30
·期 12
·7877-7888
·
IF 5.7
Gan Lin,Zheng Shuyu,Huang Jin
Gas adsorption materials, such as active carbon and zeolite, are known to cause second pollution after being used, due to their non-degradability. In this study, we prepared a degradable aerogel material based on cellulose nanocrystals (CNCs) and poly vinyl alcohol (PVA) with hierarchical pores and excellent CO \(_2\) -adsorption performance. The micropores, with specific area of 442 m \(^2\cdot\) g \(^{-1}\) , are obtained via in-situ growing MIL-100(Fe) on CNCs and concurrently assembling those CNC particles. The resulting aggregate is further introduced into degradable PVA aerogels, who offer mesopores and macropores. The resulting degradable material has a density of 0.216 g \(\cdot\) cm \(^{-3}\) and can adsorb 0.357 mmol CO \(_2\) per gram. This makes it a promising candidate for use in the preparation of light weight CO \(_2\) collectors.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 19
·1-12
·
IF 2.8
Qin Longlong,Zeng Biao,Qin Ting,Li Chen,Tang Chao,Huang Shengxiang,Deng Lianwen
Magnetic nanoparticles combined with semiconductive metal oxides are considered to be ideal candidates for electromagnetic wave absorption materials, benefiting from suitable conductivity, matched magnetism and strong polarization. In this work, Co–ZnO binary MOF (ZIF-67, ZIF-8)-based carbon composites were fabricated via a facile synthesis route. After optimization of composition and technological parameters, the synthesized nanocomposites acquired optimal electromagnetic characteristics and exhibited superb microwave absorption ability. The lowest reflection loss of the Co–ZnO–C-800 sample reached − 44.8 dB at 9.2 GHz with a thickness of 2.9 mm, and the effective absorption bandwidth (EAB) was 6.95 GHz (6.59–13.54 GHz). The microwave loss mechanism of the nanocomposite material mainly involved dielectric loss and magnetic resonance absorption. This work provides an ingenious design and synthesis strategy for novel lightweight electromagnetic wave absorbers with broadband EAB and strong absorption.
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MOLECULAR PHARMACEUTICS
·
2023
·
IF 4.9
Qingfa Tang,Yao Chen,Yusheng Zhang,Kewei Wang,Li Liu,Dongmei Pan,Qiang Liu,Cuiping Jiang
Tanshinone IIA (TS-IIA) and salvianic acid A (SAA) are the main pharmacological active constituents of Danshen, which exhibit potent effects on atherosclerosis. A combination of TS-IIA and SAA might exert a synergistic antiatherosclerotic effect. However, the opposite solubility profiles of TS-IIA and SAA might lead to difficulty in achieving a synergistic combined effect of the two active components. Therefore, in this work, we fabricated a ROS-responsive prodrug micelle for the codelivery of TS-IIA and SAA (TS-IIA-PM) by self-assembling amphiphilic block copolymer PEG5000-SAA/PLA10000-APBA. The amphiphilic polymer was characterized by 1H NMR, FTIR, and alizarin red S competition tests. The ROS responsiveness of TS-IIA-PM was evidenced by time-course monitoring of particle size and morphology changes and drug release behavior in the presence of 1 mM H2O2. We found TS-IIA-PM was stable according to its critical micelle concentration and the unchanged particle sizes in 10% FBS for 7 days. The results of in vitro and in vivo tests revealed that TS-IIA-PM was safe and biocompatible. Furthermore, it was observed that TS-IIA and prodrug micelle could produce synergistic antiatherosclerotic effect based on the results of the antioxidant study, which was further confirmed by a series of pharmocodynamics studies, such as in vitro DiI-oxLDL uptake study, oil red O staining, cholesterol efflux study, inflammatory cytokine analysis, in vivo CD68 immunostaining, and lipid disposition staining studies. Collectively, TS-IIA-PM holds great potential for the safe and efficient codelivery of TS-IIA and SAA for synergistic antiatherosclerosis.
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