WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 5
·1-13
·
IF 2.984
Chen Yuan,Zhang Tong,Luo Shuai,Zhang Yurong,Liu Yuanyuan
Xylene is a typical petrochemical industry pollutant. The fate of xylene spilled into soil was investigated in laboratory-scale batch and column experiments. The results show that free xylene in the soil evaporated quickly (7.2–10.4 mg h −1 ), but any fraction adsorbed onto the soil particles evaporated much more slowly (2.3–2.4 mg h −1 ). The retention of xylene in the soil was mainly controlled by its adsorption onto the soil minerals. The adsorption was best described using a pseudo-second-order kinetic model and Langmuir model. Adsorption up to 530 mg kg −1 was observed, and minerals such as quartz and kaolinite were the key adsorbents. Adsorption of xylene was promoted by the presence of dissolved organics up to about 50 mg L −1 , but it was significantly inhibited by cobalt-bearing compounds which are often used as catalysts in the petrochemical industry. The release of xylene from soil would be facilitated by intense rainfall and cobalt-bearing compounds but would be inhibited with the increase of rainwater acidity. This study reveals the environmental behavior of xylene in soil and provides scientific guidance for pollution control and risk assessment of BTEX contaminated sites.
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高影响因子
MOLECULAR NEUROBIOLOGY
·
2022
·Vol. 59
·期 7
·4242-4256
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IF 5.682
Wang Mingming,Yu Jiaoyan,Yang Qi,Guo Chao,Zhang Wei,Li Weiwei,Weng Yan,Ding Yi,Wang Jingwen
Ischemic strokes are associated with a high rate of disability and death globally. Cerebral ischemia/reperfusion (I/R) injury is a type of brain damage associated with oxidative stress after an ischemic stroke. Beta-boswellic acid (β-BA) reportedly exerts antioxidant and neuroprotective effects, but its role in cerebral I/R injury is unclear. The aim of this research was to investigate the neuroprotective effects, as well as the mechanisms of β-BA in cerebral I/R injury. In vivo experiments were conducted using a rat middle cerebral artery occlusion and reperfusion (MCAO/R) model, and in vitro experiments were performed using a rat neuronal oxygen–glucose deprivation and reoxygenation (OGD/R) model. Triphenyltetrazolium chloride staining, neurological function scores, terminal deoxynucleotidyl transferase deoxyuridine triphosphate nick end labeling, hematoxylin and eosin staining, and antioxidant levels in the brain were used to assess the effects of β-BA. Flow cytometry was used to detect reactive oxygen species and apoptotic cells. Western blotting and immunofluorescence staining were used to measure protein levels. The results showed that β-BA markedly improved neurological deficits and decreased infarct volume and necrotic neurons in rats. The in vitro results showed that β-BA protected neurons against OGD/R-induced injury. Additionally, β-BA significantly increased the phosphorylation of protein kinase C epsilon (PRKCE) at S729, the translocation of nuclear factor erythroid 2-like 2 (NFE2L2), and expression of heme oxygenase-1 (HMOX1). This study demonstrates that β-BA exerts neuroprotective effects against cerebral I/R via the activation of the PRKCE/NFE2L2/HMOX1 pathway and is a potential therapeutic candidate for ischemic stroke. Graphical abstract
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高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 2
·1-9
·
IF 2.15
Hu Lihua,Chen Chen,Wang Xiao,Hu Kairan,Xu Zhihao,Xu Wei
A high-efficiency adsorbent ZIF-8 was successfully prepared in a microemulsion system provided by an ionic liquid, which showed excellent potential for removing phosphate from water. The properties of the adsorbents were determined by several characterization methods, such as X-ray diffraction (XRD), infrared spectroscopy (FTIR) and Brunauere-Emmette-Teller (BET) et al. The results confirmed that ZIF-8 prepared in the ionic liquid microemulsion (ZIF-8-ILM) has a smaller particle size compared with that prepared in an aqueous solution. Moreover, the ZIF-8-ILM holds a high BET specific surface area and pore volume, as well as the textural meso- and macro-porosities formed by inter-particle voids. Based on these traits, the ZIF-8-ILM exhibit excellent adsorption capacity for phosphate, as evidenced by a maximum adsorption capacity of 178.99 mg/g was obtained. In addition, the capture of phosphate on ZIF-8-ILM was quite quickly and reached equilibrium within 60 min. Graphical abstract A high-efficiency adsorbent ZIF-8 was successfully prepared in a microemulsion system provided by an ionic liquid. The ZIF-8 materials prepared not only had high BET specific surface area and pore volume but also exhibited hierarchical pore structure, which showed excellent potential for removing phosphate from water.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 15
·12476-12489
·
IF 2.779
Wang Xinyang,Wei Shicheng,Liang Yi,Dong Chaofang,Wang Yujiang,Huang Yuwei,Li Linwei,Wang Bo
RGO/Fe 3 O 4 /FeCO 3 -based composite was prepared by a one-step hydrothermal method. The microscopic morphology and structure were studied using analytical techniques including scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electromagnetic parameters and the wave absorption properties of the composite/paraffin mixture were analyzed by the vector network analyzer. It is divulged that the FeCO 3 spheres, Fe 3 O 4 spheres, and the RGO sheets form a fluffy structure rich in microscopic cavities, as well as a good conductive network through the sphere–sheet and sphere–sphere interlap mechanisms, which significantly improves the absorbing performance of the composite. The composite can achieve a maximum reflection loss of − 37.9 dB at a frequency value of 13.9 GHz with a matching thickness of only 6.8 mm. The matching thickness can be adjusted in the range of 5.2–10.0 mm in order to attain a flexible adjustment of the effective microwave absorption band of 9.9–18.0 GHz. Combined with the first-principles calculations, compositing reduces the electron migration energy barrier and thus improves the charge transferring capability. Meanwhile, the interaction of the different components leads to the formation of a special charge transferring channel and the increase of carrier concentration, which enhances the charge transport, as well as the absorbing capacity of the absorbing material.
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Food Biophysics
·
2022
·Vol. 17
·期 4
·484-494
·
IF 3.34
Liu Jinming,Xu Jianhang,Chen Qian,Ren Jing,Wang Hui,Kong Baohua
Abstract PVA is a kind of biodegradable polymer that can be used as carbon source and energy by bacteria. In this study, deacetylated crab-shell particles (dCSPs) which exhibit strong biological activity due to the composition of chitin and CaCO 3 , as natural and environmentally friendly multi-macromolecule fillers, were used to modify poly(vinyl alcohol) (PVA) resin to form PVA/dCSP biocomposites. The Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) results proved that the –OH in PVA and the C=O groups of CO 3 2- in the dCSPs could form hydrogen bondings, which might retard the crystallisation of PVA. With the increased of dCSPs content, those biocomposites showed improved surface hydrophobicity, water vapor barrier, thermomechanical properties, thermostability, fire resistance, and antibacterial activity. Especially, PVA/dCSP biocomposite film with 30% dCSPs showed excellerent properties above with not much sacrifice of tensile strength and elongation at break. The incorporation of dCSPs effectively enhanced the bacteriostasis ability against both Escherichia coli and Staphylococcus aureus . The introduction of dCSPs in PVA ensures effective utilisation of agricultural by-products. In general, this study provides an alternative method for the development of biodegradable antibacterial materials, which could be used in food packaging applications. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 39
·58963-58979
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IF 5.19
Nkoom Matthew,Lu Guanghua,Liu Jianchao
The chronic toxicity of diclofenac (DCF) and carbamazepine (CBZ) as separate substances and in conjunction with their mixture on Daphnia magna was assessed in the parental (F0) and first filial (F1) generations. The second (F1–B2) and fifth (F1–B5) broods of F1 offspring were investigated and compared. Both drugs and their mixture were exposed to each generation of Daphnia magna for 21 days with life history, behavioural and gene expressions as measured endpoints. After the parental exposure, offspring from these two broods were transferred to a clean medium for a 21-day recovery. Exposure to diclofenac, carbamazepine and their mixture significantly inhibited growth, reproduction, swimming activities, heart rate, thoracic limb activities, reproductive and antioxidant-related genes in the parental as well as the first filial generations. These effects were relatively greater in the F1 generation. This indicates that Daphnia magna ’s sensitivity improved while its fitness declined over the two generations, which is an indicator of greater energy requirements for maintenance. Besides, the significant inhibition in the antioxidant-related genes implies that oxidative stress occurred in Daphnia magna under the exposure to these drugs. The significant reduction in the reproductive output, moulting frequency and cyp314 gene expression as a result of exposure to CBZ simultaneously obtained herein may indicate that this drug could act as an endocrine disruptor. Most of these significant effects were not recoverable after the 21-day recovery period. The findings reported herein highlight the necessity to include maternal effects in environmental risk assessment processes, considering that pollutant effects are underestimated during single-generational exposure.
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 13
·期 5
·4305-4315
·
IF 4.05
Yan Lishi,Li Liangzhi,Zhou Yuanzhuo,Hu Cuiying,Lu Chenxi,Shen Xin
Kinetic model is an important approach for quantitative expression of the mechanism of polysaccharide degradation to value-added products. This study conducted a mechanistic kinetic comparison for acidic degradation of terrestrial biomass-derived cellulose and marine algae-derived agarose to monosaccharides and 5-hydroxymethylfurfural (5-HMF). A pseudo-homogeneous first-order reaction kinetic model with Arrhenius-type temperature dependence was applied to interpret acidic degradation process of cellulose and agarose. The subsequent sensitivity analysis of the impact of rate constants on the production of monosaccharides and 5-HMF predicted in the kinetic model was performed. Results showed that rate constant of polysaccharide hydrolysis (k 1 ) exceeded rate constants of monosaccharide dehydration (k 2 ) and 5-HMF degradation (k 3 ) during agarose decomposition process, but was opposite in cellulose depolymerization process. The corresponding activation energy of agarose hydrolysis (64.5 kJ mol −1 ) was much lower than that of cellulose hydrolysis (121.4 kJ mol −1 ). Agarose was demonstrated to be superior to cellulose for producing monosaccharides and 5-HMF. The desired yields of monosaccharides and 5-HMF from agarose were obtained 58.5% and 27.5%, respectively. Subsequent sensitivity analysis revealed that rate constants k 1 and k 3 were the key factors controlling production of monosaccharides and 5-HMF from agarose, respectively.
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VETERINARY RESEARCH
·
2022
·Vol. 53
·期 1
·1-21
·
IF 3.829
Yu ZhengQing,Chen SiYing,Huang JianMei,Ding WenXi,Chen YuFeng,Su JunZhi,Yan RuoFeng,Xu LiXin,Song XiaoKai,Li XiangRui
With a worldwide distribution, Eimeria spp. could result in serious economic losses to the poultry industry. Due to drug resistance and residues, there are no ideal drugs and vaccines against Eimeria spp. in food animals. In the current study, a bioinformatics approach was employed to design a multiepitope antigen, named NSLC protein, encoding antigenic epitopes of E. necatrix NA4, E. tenella SAG1, E. acervulina LDH, and E. maxima CDPK. Thereafter, the protective immunity of NSLC protein along with five adjuvants and two nanospheres in laying chickens was evaluated. Based on the humoral immunity, cellular immunity, oocyst burden, and the coefficient of growth, the optimum adjuvant was evaluated. Furthermore, the optimum immune route and dosage were also investigated according to the oocyst burden and coefficient of growth. Accompanied by promoted secretion of antibodies and enhanced CD4+ and CD8+ T lymphocyte proportions, NSLC proteins entrapped in PLGA nanospheres were more effective in stimulating protective immunity than other adjuvants or nanospheres, indicating that PLGA nanospheres were the optimum adjuvant for NSLC protein. In addition, a significantly inhibited oocyst burden and growth coefficient promotion were also observed in animals vaccinated with NSLC proteins entrapped in PLGA nanospheres, indicating that the optimum adjuvant for NSLC proteins was PLGA nanospheres. The results also suggested that the intramucosal route with PLGA nanospheres containing 300 μg of NSLC protein was the most efficient approach to induce protective immunity against the four Eimeria species. Collectively, PLGA nanospheres loaded with NSLC antigens are potential vaccine candidates against avian coccidiosis.
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高影响因子
Pharmacological Reports
·
2022
·Vol. 74
·期 3
·523-538
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IF 3.919
Zhang Miao,Zhang Ning,Lu Xinluan,Li Wenjin,Wang Ruiyong,Chang Junbiao
Abstract As a polyphenolic compound, chlorogenic acid has antioxidant, anti-inflammatory, antiviral, anti-obesity and other effects. Based on the interactions between chlorogenic acid and the proteins (human serum albumin (HSA), pepsin (Pep), trypsin (Try), fat mass and obesity-associated protein (FTO)), results will provide clues for screening effective inhibitors. The interaction between chlorogenic acid and the four proteins (HSA, Pep, Try, FTO) was analyzed by the aid of fluorescence quenching, synchronous fluorescence, three-dimensional fluorescence, isothermal titration calorimetry, and molecular docking. It can be concluded that there is no obvious interaction between chlorogenic acid and FTO. The binding affinity between chlorogenic acid and three proteins is HSA > Try > Pep. The binding process is spontaneous, and the quenching type is static quenching. Hydrophobic interaction and hydrogen bonding is observed in the binding process. This study provides valuable information for understanding the interaction mechanism between chlorogenic acid and proteins, and provides clues for screening inhibitors. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 45
·68680-68691
·
IF 5.19
Guo Lin-yu,He Xian,Hong Zhi-neng,Xu Ren-Kou
Lead (Pb) is one of the top metal pollutants worldwide, and its distribution between liquid and solid phases of soils is strongly controlled by its adsorption on minerals, organic matter, and their composites. This paper presented the effect of fulvic acid (FA) coexistence on the distribution of Pb(II) at the solid–liquid interface of four minerals, which provided reference for how to use humic substances to remove toxic Pb(II) in soils. The free Pb 2+ of suspensions, measured by Pb ion selective electrode, was used to characterize the complexation of FA with Pb 2+ at various pH. The adsorption isotherms of Pb(II) by montmorillonite, kaolinite, goethite, and gibbsite with and without FA were studied with batch experiments. Results indicated that the free Pb 2+ decreased and complexed Pb(II) increased with the increase of FA concentration in Pb(II)-FA solutions, whether the initial concentration of Pb(II) was 0.1 or 1 mM. Pb 2+ hydrolysis was low and the free Pb 2+ concentration in pure lead solution without FA was generally unchanged with increasing solution pH at pH < 6.0. But free Pb 2+ decreased with the increase of pH in the presence of FA, suggesting that the complexation ability of FA with Pb 2+ increased with the increase of solution pH. The adsorption of Pb(II) by the minerals without FA followed the order: montmorillonite > kaolinite ≈ goethite > gibbsite at pH5.0. The Pb(II) adsorption by montmorillonite and kaolinite significantly enhanced with 1 g/L FA, while significantly inhibited with 3 g/L FA at low initial Pb(II) concentration. However, the effect of FA on Pb(II) adsorption by montmorillonite was greater than that of kaolinite, which was mainly related to the crystal layer structure, adsorption area, and cation exchange capacity of the minerals. The Pb(II) adsorption by goethite and gibbsite was significantly enhanced by the addition of both 1 g/L and 3 g/L FA, and the enhancement was more evident in goethite system. The effect of FA on the distribution of Pb(II) between solid and liquid phases of the minerals was determined by the factors such as the initial concentration ratio of FA to Pb(II), the adsorption capacity of minerals for FA, and the number of soluble complexes of FA with Pb 2+ . Therefore, the distribution of FA between solid and liquid of four minerals affected the distribution of Pb(II) between solid and liquid phases of the minerals greatly. The results can provide an important reference for understanding the distribution of Pb(II) and the dynamics and mobility of active components in polluted soils.
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Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Liu Xin,Wang Qing,Song Xin,Li Kang,Ali Mukhtiar,Wei Changlong,Che Jilu,Guo Siwei,Dou Xuedan
In this study, a novel and environmental-friendly biochar prepared by alien species, Alternanthera philoxeroides ( AP ) under a temperature range of 300–700˚C (BC300-BC700), was applied to remove phenanthrene (PHE), perchloroethylene (PCE), and PHE/PCE bi-contaminant from aqueous solutions. Interestingly, the maximum adsorption capacity of AP biochar changed nonlinearly as the pyrolysis temperature increased, with BC400 and BC300 having the highest maximum adsorption capacities of 2.83 and 2.13 mg/g, respectively, followed by BC700, BC500, and BC600. The sorption kinetics of PHE and PCE on BC300 under single- and bi-contaminant conditions can be described by pseudo-second-order and pseudo-first-order kinetic models, respectively. In addition, it was observed that PHE and PCE could be removed simultaneously by BC300, and the presence of PHE inhibited the maximum sorption capacity of PCE onto AP biochar. Furthermore, this study revealed that the functional groups of C-O, C = O, and C = C played a key role in the removal of PHE/PCE from bi-contaminant solutions. These findings suggested that pyrolysis of invasive plants can be an option to control invasive plants and also contribute to the adsorption of organic contaminants for contaminant remediation. Graphical abstract
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高影响因子
CHEMISTRY AND TECHNOLOGY OF FUELS AND OILS
·
2022
·Vol. 58
·期 1
·169-180
·
IF 0.51
Su Junlin,Zhang Ai,Zuo Fuyin,Jiang Sichen
In this study, a desulfonated hybrid organic/inorganic fluid loss agent resistant to high temperatures is synthesized by using free-radical copolymerization. The fluid loss agent consists of the organic monomer acrylamide (AM), N-vinylpyrrolidone (NVP), dimethyl diallyl ammonium chloride (DMDAAC), and the inorganic monomer KH570 modified by nano-silica (M-SiO2). A field emission transmission electron microscope, an infrared spectrometer, and a thermogravimetric analyzer are used to examine the morphology and structure of the fluid loss agent. The results show that the inorganic nanoparticles and organic polymers are successfully grafted, and the resulting “core-shell” structure is connected by molecular chains. When 2% wt of the synthetic fluid loss additive E(AND-SiO2) is added to the base slurry, the normal-pressure fluid loss (FLAPI) and high-temperature, high-pressure fluid loss (FLHTHP) of the slurry are determined by the aging tests at 150, 160, 170, 180, 190, and 200°C for 16 hours. The results show that when the temperature is 180°C, FLAPI is 6.4 mL, FLHTHP is 28 mL, and temperature resistance is good. The biological toxicity and biodegradability tests show that the fluid loss control agent does not only effectively reduce the fluid loss, but also easily degrades, making it an environmentally-friendly treatment agent.
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