Science China-Technological Sciences
·
2021
·Vol. 64
·期 10
·2292-2299
·
IF 3.572
Miao Xiao,Liu Shuai,Wang Min,Ge Bo,Zhu ChangQing
It is an ideal way to produce clean water after sewage treatment, during which two problems need to be solved: (1) how to deal with water soluble pollutants and surface oil slick; (2) photothermal devices should float on water. This paper presents a multifunctional water treatment device that can produce clean water vapor under light after sewage treatment. The bismuth oxybromide catalyst degrades water-soluble pollutants under light irradiation. Superhydrophobic (SH) melamine sponge has two functions: selectively adsorb surface oil slick and ensure that photothermal devices float. The hydrophilic layer provides water for local heating of the photothermal layer to produce water vapor. The SH sponge remains stable and is easy to operate during wastewater treatment, and the efficiency of water vapor production through the photothermal device is increased by 7.2 times compared with that of pure water.
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Horticulture Research
·
2021
·
IF 6.793
Liu Qun,Li Li,Cheng Haitao,Yao Lixiang,Wu Jie,Huang Hui,Ning Wei,Kai Guoyin
Polyphenols are the main active components of the anti-inflammatory compounds in dandelion, and chlorogenic acid (CGA) is one of the primary polyphenols. However, the molecular mechanism underlying the transcriptional regulation of CGA biosynthesis remains unclear. Hydroxycinnamoyl-CoA:quinate hydroxycinnamoyl transferase (HQT2) is the last rate-limiting enzyme in chlorogenic acid biosynthesis in Taraxacum antungense. Therefore, using the TaHQT2 gene promoter as a probe, a yeast one-hybrid library was performed, and a basic helix-loop-helix (bHLH) transcription factor, TabHLH1, was identified that shared substantial homology with Gynura bicolor DC bHLH1. The TabHLH1 transcript was highly induced by salt stress, and the TabHLH1 protein was localized in the nucleus. CGA and luteolin concentrations in TabHLH1-overexpression transgenic lines were significantly higher than those in the wild type, while CGA and luteolin concentrations in TabHLH1-RNA interference (RNAi) transgenic lines were significantly lower. Quantitative real-time polymerase chain reaction demonstrated that overexpression and RNAi of TabHLH1 in T. antungense significantly affected CGA and luteolin concentrations by upregulating or downregulating CGA and luteolin biosynthesis pathway genes, especially TaHQT2, 4-coumarate-CoA ligase (Ta4CL), chalcone isomerase (TaCHI), and flavonoid-3′-hydroxylase (TaF3′H). Dual-luciferase, yeast one-hybrid, and electrophoretic mobility shift assays indicated that TabHLH1 directly bound to the bHLH-binding motifs of proTaHQT2 and proTa4CL. This study suggests that TabHLH1 participates in the regulatory network of CGA and luteolin biosynthesis in T. antungense and might be useful for metabolic engineering to promote plant polyphenol biosynthesis.
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IONICS
·
2021
·Vol. 27
·期 10
·4429-4437
·
IF 2.817
Wang Jing,Liu Xue-An,Zhang Dashui,Tong Zhangfa,Ji Hongbing,Qu Hui-Ying
The popularity of intelligent electronic products demands suitable smart electrodes with high specific capacitance, superior durability, and intrinsic safety. Herein, a bifunctional titanium dioxide (TiO 2 ) electrode with electrochromic energy storage in the Zn-ion aqueous electrolyte was demonstrated. The color of the electrode can be changed according to its charging state by Zn 2+ intercalation/de-intercalation, to realize the noticeable judgment and prediction of the energy contained. Direct growth of TiO 2 by the hydrothermal method effectively increases the bonding force between the active TiO 2 material and the substrate. Electrochemical results show that the TiO 2 electrode has high specific capacitance of 139.8 mF·cm −2 at 1.5 mA·cm −2 , and retains 93% of the initial areal specific capacitance after 100 CV cycles. In addition, it exhibits high transmittance contrast of 45% at a wavelength of 980 nm in the near-infrared region, short bleaching time (6.5 s) and coloration time (18.0 s) at an alternating potential between 0 and − 1.1 V. These superior electrochemical and electrochromic performances can be attributed to the fast Zn 2+ diffusion facilitated by the porous structure and short ion diffusion distance of the TiO 2 electrode.
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CURRENT MICROBIOLOGY
·
2021
·Vol. 78
·期 12
·4084-4097
·
IF 2.188
Ahmad Manzoor,Ling Juan,Yang Qingsong,Sajjad Wasim,Zhou Weiguo,Yin Jianping,Dong Junde
Seagrass meadows constitute a prestigious ecosystem in the marine environment, providing valuable ecological and commercial services. Among the various causes, pollutions are considered one of the significant reasons for seagrass decline globally. This study investigates the impacts of polycyclic aromatic hydrocarbons mixture (pyrene, phenanthrene, and fluorene) on bacterial communities in Halophila ovalis sediments. The seagrass sediment bacterial microbiome was evaluated in a batch culture experiment by Illumina MiSeq sequencing. Culture-able bacterial strains were isolated and characterized by 16S rRNA gene sequencing. The results demonstrated an excellent alpha diversity in the original sediments with a Shannon index of (8.078) compared to the subsequent control group (5.908) and PAH-treated group (PAH-T) (4.916). Three phyla, Proteobacteria , Firmicutes, and Bacteroidetes, were detected in high abundance in the control and PAH-T groups. However, a significant difference ( P < 0.05) was observed at the genus level between control and PAH-T group bacterial consortia. Pseudomonas, Mycobacterium, Idiomarina, Hydrogenophaga, Alteromonas, Sphingobacterium, and several others were highly abundant in PAH-T groups. Most of the culture-able isolates recovered in this study showed the closest resemblance to previously identified hydrocarbon-degrading bacteria. Among the three strains, Mix-16 ( Citricoccus yambaruensis ) and Mix-20 ( Gordonia rubripertincta ) showed a higher degradation of PAHs than Mix-19 ( Isoptericola halotolerans ) in the monoculture experiment. The most increased degradation of PAHs was recorded in the co-culture experiment. The present work revealed that PAHs could act as environmental stress and can influence bacterial community succession. Moreover, the co-culture strategy significantly enhanced the biodegradation of PAHs.
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POLYMER JOURNAL
·
2021
·Vol. 54
·期 1
·47-55
·
IF 3.08
Jiao Danhua,Cai Xiaodong,Song Qun,Zhou Ruiqun,Peng Xiao,Bao Dongmei
A series of aliphatic poly(carbonate-co-ester)s (PBCFs) were successfully synthesized via melt polycondensation of 1,4-butanediol (BD) and dimethyl carbonate (DMC) in the presence of biobased fumaric acid (FA). The prepared unsaturated copolymers had weight-average molecular weights ( M w ) in the 4.98 × 10 4 to 8.82 × 10 4 g·mol −1 range and from 1.56 to 1.83 polydispersities. They all had random microstructures. The physical properties of the novel poly(carbonate-co-ester)s, such as melting temperature ( T m ) and melting enthalpy ( ∆H m ), varied widely depending on their composition. The stiff fumaric acid units in the poly(butylene carbonate) (PBC) chain caused an increase in the glass transition temperature ( T g ) and thermal stability. Furthermore, PBCF10 to PBCF20 (with fumaric acid unit content of <19%) contained PBC crystals, while the lattice structure of PBCF40 to PBCF80 (with fumaric acid unit content greater than 37%) was similar to that of the poly(butylene fumarate) (PBF) type. The mechanical properties and biodegradability of the copolymers were also studied.
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Nature Biomedical Engineering
·
2021
·Vol. 5
·期 10
·1189-1201
·
IF 25.671
Xie Renjian,Yao Hang,Mao Angelina S.,Zhu Ye,Qi Dawei,Jia Yongguang,Gao Meng,Chen Yunhua,Wang Lin,Wang Dong-An,Wang Kun,Liu Sa,Ren Li,Mao Chuanbin
The early stages of progressive degeneration of cartilage in articular joints are a hallmark of osteoarthritis. Healthy cartilage is lubricated by brush-like cartilage-binding nanofibres with a hyaluronan backbone and two key side chains (lubricin and lipid). Here, we show that hyaluronan backbones grafted with lubricin-like sulfonate-rich polymers or with lipid-like phosphocholine-rich polymers together enhance cartilage regeneration in a rat model of early osteoarthritis. These biomimetic brush-like nanofibres show a high affinity for cartilage proteins, form a lubrication layer on the cartilage surface and efficiently lubricate damaged human cartilage, lowering its friction coefficient to the low levels typical of native cartilage. Intra-articular injection of the two types of nanofibre into rats with surgically induced osteoarthritic joints led to cartilage regeneration and to the abrogation of osteoarthritis within 8 weeks. Biocompatible injectable lubricants that facilitate cartilage regeneration may offer a translational strategy for the treatment of early osteoarthritis.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 9
·1-18
·
IF 2.253
Zhou Shujia,Yan Chengrong,Dang Yunfei,Cao Xuefang,Wei Zhixian
In this paper, a series of samples La 0.7 Sr 0.3 Mn 1-x Fe x O 3 ( x = 0, 0.05, 0.10, 0.15, 0.2) were prepared. Among these samples, La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 showed better catalytic activity than the samples with undoped and other doped ones, so undoped iron La 0.7 Sr 0.3 MnO 3 and doped iron La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 were characterized by X-ray diffraction (XRD), UV–Vis diffuse reflection analysis (UV–Vis DRS), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), scanning electron microscope (SEM), specific surface analysis (BET), and X-ray photoelectron spectroscopy (XPS). In addition, it takes methyl orange (MO) as the object of degradation, and the photocatalysis, Fenton-like reaction, and their synergistic catalytic effects as well as the catalytic mechanisms of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 have been studied. The results show that La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 exhibits high solar-driven photocatalytic and Fenton-like catalytic activities for MO degradation. Moreover, there is an obvious synergistic catalytic effect of photocatalysis and Fenton-like catalytic activity. In addition, according to the free radical capture experiment, the hole, •OH and •O 2 − are the active substances in the synergistic catalytic process. The possible synergistic catalytic mechanism of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 was also proposed. And the average pore size of the catalyst is 20.91 nm by BET. The near-superparamagnetic properties of La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 enable it to achieve simple separation in an external magnetic field, avoiding the disadvantages of ordinary catalysts that are difficult to separate. Therefore, La 0.7 Sr 0.3 Mn 0.85 Fe 0.15 O 3 is an advanced multifunctional nanocatalyst and could be widely used in the field of wastewater treatment. Graphical abstract The magnetic La0.7Sr0.3Mn0.85Fe0.15O3 was synthesized by hydrothermal method successfully, the photocatalysis, Fenton-like reaction and their synergistic catalytic effects as well as the catalytic mechanisms of La0.7Sr0.3Mn0.85Fe0.15O3 have been studied, It is not only a high efficient solar-driven photocatalyst, but also has Fenton -like catalytic properties, and both of them have synergistic catalytic effect. And those indicate that La0.7Sr0.3Mn0.85Fe0.15O3 is an advanced multi-functional catalyst.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 11
·1-8
·
IF 2.009
Cao Sheng,Dai Chencheng,Zhao Jialong,Zou Bingsuo
In this work, a facile approach to synthesize the Ag- and Mn-codoped Zn-In-S nanocrystals (NCs) with dual emissions as ratiometric temperature sensors is reported. The as-synthesized codoped Zn-In-S NCs have a uniform size distribution and exhibit a zinc blende ZnS phase structure. Moreover, the as-produced codoped NCs show dual emission peaks which center at green and orange-red regions and have a photoluminescence quantum yield (PL QY) up to 45%. The time-resolved PL spectroscopy and X-ray photoelectron spectroscopy characterizations reveal that the dual emissions of these NCs are derived from the intrinsic emission of Ag + and Mn 2+ , respectively. Moreover, the relative intensity ratio of dual emissions can be tailored by adjusting the Ag and Mn doping concentrations. The as-built ratiometric temperature sensors based on the codoped NCs exhibit a thermometric sensitivity of ~ 0.17% K -1 over a broad window of 80–200 K, suggesting that these codoped Zn-In-S NCs are promisingly used for bio-optical ratiometric temperature sensing.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
He Shao-Bin,Chen Rui-Ting,Wu Yan-Yu,Wu Gang-Wei,Peng Hua-Ping,Liu Ai-Lin,Deng Hao-Hua,Xia Xing-Hua,Chen Wei
Platinum nanoparticles (Pt NPs) covered with a bovine serum albumin scaffold and a particle size of 1.5 nm (BSA-Pt S NPs) are shown to display enhanced multiple enzyme-mimicking activities including peroxidase, oxidase, and catalase-like activities. The peroxidase-like activity is characterized by robustness and low signal background. BSA-Pt S NPs were used to design colorimetric assays for H 2 O 2 and glucose. H 2 O 2 latter reacts with 3,3′,5,5′-tetramethylbenzidine in the presence of BSA-Pt S NPs to form a blue product with an absorption maximum at 652 nm. The assay works in the 5–250 μM H 2 O 2 concentration range. The glucose assay is based on its glucose oxidase-catalyzed oxidation to produce gluconic acid and H 2 O 2 which then is colorimetrically quantified. Response is linear in the 10–120 μM glucose concentration range, and the detection limit is 2 μM (at S/ N = 3). The method correlates well with the glucose standard method (R 2 = 0.997 in the 95% confidence interval) which confirms that glucose in human serum has been successfully detected.
Improved enzymatic assay for hydrogen peroxide and glucose by exploiting the enzyme-mimicking properties of BSA-coated platinum nanoparticles.
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Applied Nanoscience
·
2019
·Vol. 10
·期 3
·661-669
·
IF 3.198
Zhang Xudong,Ma Su,Li Aikun,Chen Linya,Lu Jiangwei,Geng Xuemin,Xie Ming,Liang Xiaoyu,Wan Yanfen,Yang Peng
Noble metal nanoparticles (NPs) have potential for use in many optical and electronic applications due to their shape- and size-dependent properties. However, it remains a significant challenge to synthesize size- and shape-controlled NPs on a large scale while maintaining their unique properties. We have demonstrated a simple and effective microreactor based on a microfluidic chip and liquid peristaltic pump for the synthesis of monodispersed Au NPs. This reactor allows for the continuous high-flux synthesis of Au NPs with precisely controlled sizes. The effects of reaction temperature, reaction time, flow ratio of the two inlets, and amount of surfactant agent are investigated in this study. The uniform and ultrafine Au NPs were synthesized by directly controlling the temperature, flow rate, surfactant concentration, and flow rate ratio. Moreover, the Au NPs are fabricated controllably, continuously, and stably on a large scale with this system. The proposed system thus contributes to the large-scale industrial production of NPs.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 36
·36410-36422
·
IF 2.914
Latif Abdul,Kai Sun,Si Youbin
This study demonstrated, for the first time, Fe(III)/peroximonosulphate (PMS) could be an efficient advanced oxidation process (AOP) for wastewater treatment. Bisphenol A (BPA) was chosen as a model pollutant in the present study. Fe(III)-activated PMS system proved very effective to eliminate 92.18% of BPA (20 mg/L) for 30-min reaction time at 0.50 mM PMS, 1.5 g/L Fe(III), pH 7.0. The maximum degradation of BPA occurred at neutral pH, while it was suppressed at both strongly acidic and alkaline conditions. Organic and inorganic ions can interfere with system efficiency either positively or negatively, so their interaction was thoroughly investigated. Furthermore, the presence of organic acids also affected BPA degradation rate, especially the addition of 10 mM citric acid decreased the degradation rate from 92.18 to 66.08%. Radical scavenging experiments showed that SO 4 •– was the dominant reactive species in Fe(III)/PMS system. A total of 5 BPA intermediates were found by using LC/MS. A possible degradation pathway was proposed which underwent through bridge cleavage and hydroxylation processes. Acute toxicity of the BPA degradation products was assessed using Escherichia coli growth inhibition test . These findings proved to be promising and economical to deal with wastewater using iron mineral for the elimination of organic pollutants.
Graphical abstract
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Liu Zhi,Ju Kaiyi,Wang Zongqian,Li Wei,Ke Huizhen,He Jihuan
Electrical voltage has a crucial effect on the nanofiber morphology as well as the jet number in the electrospinning process, while few literatures were found to explain the deep mechanism. Herein, the electrical field distribution around the spinning electrode was studied by the numerical simulation firstly. The results show that the electrical field concentrates on the tip of a protruding droplet under relatively low voltage, while subsequently turns to the edge of needle tip when the protruding droplet disappears under high voltage. The experimental results are well consistent with the numerically simulated results, that is, only one jet forms at low voltage (below 20 kV for PVDF-HFP and PVA nanofiber), but more than one jet forms under high voltage (two jets for PVDF-HFP nanofiber, four jets for PVA nanofiber). These more jets lead to (1) higher fiber diameter resulting from actually weaker electrical field for each jet and (2) wide distribution of fiber diameters due to unstable spinning process (changeable jet number/site/height) under high voltage. The results will benefit the nanofiber preparation and application in traditional single-needle electrospinning and other electrospinning methods.
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