INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Guo-Cui Mao,Xiao-Tian Kan,Ming-Xiu Xiao,Wen-Long Liu,Bao-Xia Dong,Yun-Lei Teng
CaO is promising to be widely used to capture CO2. The produced CaCO3 can be considered as solid CO2, which is also a plentiful, convenient, and useful carbon resource. Here, for the first time, we report that an alkaline earth metal can selectively induce the hydrogenation of the CaO-captured CO2 (namely, the produced CaCO3) to CH4 under room-temperature ball-milling conditions. The effects of ball-milling conditions and different catalysts on the methanation performance were studied. The results show that the CH4 yield can reach 56.1%, and the CH4 selectivity is 100%. When adding metal Ni, the CH4 yield can be further increased. The experimental and density functional theory calculation results indicate that the in situ formed metal hydride plays a key role in the process of methanation. This work provides a novel and energy-saving method to convert the metal oxide-captured CO2/carbonate to CH4 at room temperature.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Jun Chen,Shuanghong Tian,Jiang Lu,Ya Xiong
This study aims to provide a direction to tailor catalytic activity of catalyst by selectively exposing a crystal facet. Herein three sheet-like MgO materials with the primarily exposed crystal facet of (1 1 1), (1 1 0), (2 0 0) were prepared, respectively. Results show that the catalytic ozonation on each MgO substantially enhanced the removal of 4-chlorophenol and total organic carbon when compared with ozonation alone or that on traditional MgO. The pseudo first-order reaction constant of 4-chlorophenol removal in ozonation catalyzed by MgO(1 1 1), MgO(1 1 0), MgO(2 0 0) is 4.8, 2.5, 3.1 times higher than that in the single ozonation, respectively. When different dosage but the same surface area of MgO was applied, their catalytic activities changed as MgO(1 1 1) > MgO(1 1 0) > MgO(2 0 0). It indicates that the catalytic activity significantly depends on the crystal facet besides the surface area. That is because the drawbacks, such as edges, steps, and kinks, on each facet decreased in the order of (1 1 1) > (1 1 0) > (2 0 0). CO 2 -TPD and zeta potential measurement show that the drawbacks caused more and stronger surface basic groups in the form of hydroxyl and isolated oxygen due to the availability of more unsaturated coordination sites. These active basic centers make the easy formation of basic microenvironment near MgO particles and thus favor the ozonation. Finally, the catalytic mechanism was explored and compared by evaluating the ozone decomposition, qualitatively and quantitatively identifying hydroxyl radicals, and determining the ozone utilization efficiency. It reveals that MgO with more surface basic groups can enhance the transformation rate of ozone to hydroxyl radicals more efficiently. All these results show that MgO is a very potential ozonation catalyst and the catalytic activity can be tailored by exposing crystal facet with more drawbacks.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 12
·3838-3846
·
IF 5.368
Yonghang Xu,Min Xiao,Shuanjin Wang,Mei Pan,Yuezhong Meng
A series of salicylaldiminato-zinc and -tri-zinc complexes containing various Schiff base ligands were prepared using quick methods and then well identified by full characterization. All zinc complexes were examined as catalysts for the copolymerization of CO2 and cyclohexene oxide. Many factors such as electron-donating or -withdrawing substituents on the benzene rings of the ligands, as well as chloride anions or acetate groups bound to the zinc centers, are found to greatly influence on the insertion of CO2 and ring-opening of epoxides. Tri-metallic complexes 2a and 2b exhibited excellent catalytic activities, and thus the copolymerization conditions such as temperature, pressure and reaction time were optimized. The molecular weights of the resulting copolymers determined by gel permeation chromatography display a bimodal distribution with relatively wide polydispersities. The results of the investigation indicate that the catalytic activities of zinc complexes are highly dependent on the electronic density and steric environment around the Zn metal centers.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 19
·期 2
·497-506
·
IF 2.234
Jiang Liqing,Cui Lili,He Xingquan
Cobalt 5,10,15,20-tetrakis(4-pyridyl)porphyrin (CoTPyP) micro/nanoparticles assembled on poly(sodium-p-styrenesulfonate) (PSS) modified reduced graphene oxide (PSS-rGO) as a nonnoble catalyst for oxygen reduction reaction (ORR) was prepared by an in situ solvothermal synthesis method. The CoTPyP/PSS-rGO micro/nanocomposite was characterized by UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM) techniques. Cyclic voltammetry (CV) measurement result disclosed that CoTPyP/PSS-rGO possesses quite high electrochemically accessible surface area, which was more than tripled as large as the bare glassy carbon (GC) electrode. Rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) techniques were employed to study the catalytic activity and the ORR mechanism of as-synthesized CoTPyP/PSS-rGO catalyst in an alkaline medium. Linear sweep voltammetry (LSV) tests showed that the half-wave potential for ORR on the CoTPyP/PSS-rGO catalyst was found to be around −0.22 V vs. saturated calomel electrode (SCE), which was similar to that on Pt/C (−0.20 V vs. SCE). RRDE results displayed that the percentage of hydrogen peroxide yielded on the CoTPyP/PSS-rGO composite was less than 20 %, and the ORR process mainly proceeded via an almost direct 4-electron pathway. Moreover, the assembled CoTPyP/PSS-rGO catalyst possessed good stability and excellent tolerance to the crossover effect of methanol for ORR.
研究领域:
电化学
·
纳米材料
·
能源材料
·
催化化学
·
表面科学
✓ 已验证
DOI
高影响因子
Environmental Systems Research
·
2024
·Vol. 13
·期 1
·1-10
·
IF 0
Du Hairong,Zhu Xiaoling,Yao Yunying,Yao Wei
Neonicotinoid insecticides (NNIs), as a new type of insecticide, are widely used in agriculture and daily life. Because of the low volatility of NNIs, few studies have evaluated them in atmospheric particulate matter. In this study, 101 outdoor PM 2.5 samples were collected from the Wuhan urban area from 2019 to 2021, leading to the detection of seven NNIs and three of their metabolites. The detection frequencies of all 10 substances were more than 60%, with DIN (dinotefuran) and IMI (imidacloprid) reaching 100%. DIN (52.4 pg/m 3 ) and IMI (43.0 pg/m 3 ) had higher median concentrations than other substances. Concentration distributions of the four substances ACE (acetamiprid), DIN, IMI, and 5-OH-IMI (5-Hydro-Imidacloprid) exhibited statistically significant differences ( P < 0.05) across the four seasons. Concentration levels of ACE, CLO (clothianidin), and IMI were statistically different between the three years ( P < 0.05). The median concentration of imidacloprid-equivalent total neonicotinoids (IMIeq: generated by the relative potency factor method) was 256.1 pg/m 3 . Finally, the estimated daily intake (EDI) of NNIs via respiration was greater in infants and young children than in the rest of the population, suggesting that infants and young children were more likely to be exposed to the health effects of airborne residual PM 2.5 .
研究领域:
环境科学
·
公共卫生
·
毒理学
✓ 已验证
DOI
Bioresource Technology Reports
·
2019
·
IF 0
Yingxue Gong,Zhibin Fu,Menglian Liu,Yu Dai,Jianghai Lin,Zehuan Liu
The alkalis sodium ethoxide and calcium hydroxide were combined to pretreat the abundant agricultural waste sugarcane leaf (SCL). The pretreatment conditions were optimized using single factors and orthogonal array, and the results of material's chemical compositions and enzymatic hydrolysis were investigated. The optimized conditions were pretreating SCL with C 2 H 5 ONa:Ca(OH) 2 volume ratio of 4:1 at 121 °C for 30 min. Under these conditions, the lignin removal rate of SCL was 86.26%, while the total reducing sugars and total enzymatic efficiency of enzymatic hydrolysis could reach 14.82 g/L and 80.02% respectively. These pretreating and hydrolysis results were similar compared with those of SCL pretreated with strong base C 2 H 5 ONa alone. But the strong base dosage was saved 20% and the pretreatment time was shortened to 30 min. Therefore the combined alkali pretreatment could significantly save energy and reduce environmental pollution, which made it a promising method in large-scale production.
研究领域:
生物能源
·
农业废弃物利用
·
生物质转化
✓ 已验证
DOI
FOOD CHEMISTRY
·
2013
·
IF 3.334
Guisheng Zhou,Hanqing Pang,Yuping Tang,Xin Yao,Yunhe Ding,Shaoqing Zhu,Sheng Guo,Dawei Qian,Juan Shen,Yefei Qian,Shulan Su,Li Zhang,Chun Jin,Yong Qin,Jin-Ao Duan
In this study, a rapid, simple and sensitive analytical method was developed for the quantitative determination of 20 nucleosides and nucleobases in functional foods at trace levels using hydrophilic interaction ultra-performance liquid chromatography coupled with triple-quadrupole tandem mass spectrometry (HILIC-UPLC–TQ-MS/MS) in multiple-reaction monitoring (MRM) mode. Under optimised chromatographic conditions, good separation of 20 target compounds was achieved using a Waters Acquity UPLC BEH Amide column and gradient elution in 11 min. The limits of detection (LODs) and quantification (LOQs) were between 0.02–42.54 ng/mL and 0.05–98.18 ng/mL for the 20 analytes, respectively. This is the first report about simultaneous analysis of nucleosides and nucleobases in functional foods using this method, which afforded good linearity, precision, repeatability and accuracy. The method developed was successfully applied to quantify target compounds in batches of ginkgo seeds. The method potentially could be used to determine polar and trace-level nucleosides and nucleobases in ginkgo seeds.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
Insects
·
2024
·Vol. 15
·期 5
·345
·
IF 2.7
Jifan Cao,Wende Zheng,Baizhong Chen,Zhenping Yan,Xiaowen Tang,Jiahao Li,Zhen Zhang,Song Ang,Chen Li,Rihui Wu,Panpan Wu,Wen-Hua Chen
Simple SummaryThe essential oil (EO) ofCitrus reticulataBlanco cv. Chachiensis (Chachi) exhibited significant larvicidal activity. The EO from semi-mature fruits and its main components were able to control mosquitoes by effectively inhibiting acetylcholinesterase and three detoxification enzymes and significantly altering the diversity of the internal microbiota in mosquitoes.AbstractThe overuse of synthetic insecticides has led to various negative consequences, including insecticide resistance, environmental pollution, and harm to public health. This may be ameliorated by using insecticides derived from botanical sources. The primary objective of this study was to evaluate the anti-mosquito activity of the essential oil (EO) ofCitrus reticulataBlanco cv. Chachiensis (Chachi) (referred to as CRB) at immature, semi-mature, and mature stages. The chemical compositions of the CRB EO were analyzed using GC-MS. The main components were identified to be D-limonene andγ-terpinene. The contents of D-limonene at the immature, semi-mature, and mature stages were 62.35%, 76.72%, and 73.15%, respectively; the corresponding contents ofγ-terpinene were 14.26%, 11.04%, and 11.27%, respectively. In addition, the corresponding contents of a characteristic component, methyl 2-aminobenzoate, were 4.95%, 1.93%, and 2.15%, respectively. CRB EO exhibited significant larvicidal activity againstAedes albopictus(Ae. albopictus, Diptera: Culicidae), with the 50% lethal doses being 65.32, 61.47, and 65.91 mg/L for immature, semi-mature, and mature CRB EO, respectively. CRB EO was able to inhibit acetylcholinesterase and three detoxification enzymes, significantly reduce the diversity of internal microbiota in mosquitoes, and decrease the relative abundance of core species within the microbiota. The present results may provide novel insights into the utilization of plant-derived essential oils in anti-mosquitoes.
研究领域:
植物学
·
公共卫生
·
昆虫学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Miaorou Dai,Yangyang Dong,Sen Ma,Lihui Gan,Lu Lin,Jian Liu
This work proposed a two-step pretreatment method of cooking with active oxygen and solid alkali (CAOSA) followed by dilute sulfuric acid treatment (DA), to contribute enzymatic hydrolysis of corn cob . The first step, CAOSA pretreatment , removed 83.16 % of the lignin, while the second step, a milder pretreatment with DA further eliminated hemicellulose . After the two-step pretreatment , the cellulose content of the residue reached 66.74 %, and with a solid loading of 5 %, the glucose yield was remarkably high at 98.35 % with a concentration of 36.47 g/L. The optimal conditions of the process were determined as follows: DA with 1 % H 2 SO 4 at a solid-to-liquid ratio of 1:10, a temperature of 110 ℃, and a pretreatment time of 60 min. To confirm the efficacy of the two-step pretreatment, we characterized the samples treated with different methods using X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The developed method proposes an effective pretreatment and results in the complete enzymatic hydrolysis of corn cob.
研究领域:
生物化学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMATERIALS APPLICATIONS
·
2024
·
IF 2.3
Qingxia Guan,Yumeng Liu,Zhaorui Xia,Yue Zhang,Liping Wang,Yanhong Wang,Shujun Zou,Shaowa Lv,Xiaoying Zhou
Background: Glycyrrhetinic acid-mediated brucine self-assembled nanomicelles enhance the anti-hepatitis B properties of brucine by improving its water solubility, short half-life, toxicity, and side effects. Brucine (B) is an indole alkaloid extracted from the seeds of Strychnos nux-vomica (Loganiaceae). Purpose: To assess the efficacy of the Brucine-Glycyrrhetnic acid-Polyethylene glycol-3,3’-dithiodipropionic acid-Glycerin monostearate (B-GPSG) in treating hepatitis B, its potential to protect against acute liver injury caused by d-galactosamine and its anti-hepatoma activities were studied. Research Design: The concentration of B-GPSG used in the in vivo and in vitro experiments was 0.63 mg/mL. The rats injected with d-GalN (450 mg/kg) were used as liver injury models. The rats were separated into normal, model, positive, positive control, B-PSG and B-GPSG groups. Hepatoma cells expressing HBV HepG2.2.15 were used for in vitro experiments. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, plate cloning, Hoechst staining and flow cytometry were conducted to explore the mechanism of B-GPSG against hepatitis B. Results: Compared with the model group, the liver coefficient of B-GPSG group decreased (4.59 ± 0.17 vs 5.88 ± 0.42), the content of MDA in rat liver homogenate decreased (12.54 ± 1.81 vs 23.05 ± 2.98), the activity of SOD increased, the activity of ALT and AST in rat serum decreased. In vitro, the IC50 values of B-GPSG group decreased. B-GPSG group effectively inhibited the proliferation and migration of HepG2.2.15 cells. Conclusions: The hepatoprotective effects of B-GPSG nanomicelles, which are attributed to their GA-mediated liver targeting and synergistic actions with brucine, suggest their therapeutic potential against hepatitis B. This development opens up new possibilities for the application of traditional Chinese medicine and nanomedicine in anti-hepatitis B.
研究领域:
药理学
·
纳米医学
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Long Li,Yi Qian,Haiming Zhang,Haoyue Han,Peng Qiao
A novel silica gel-based absorbent SG-GA, capable of selective adsorption of Pb(II) from an aqueous solution containing mixed metal ions of Cr(VI) and Cu(II), was prepared by grafting of a Schiff base glutaraldehyde (GA) ligand onto the surface of a modified silica gel. The functionalized silica gels were characterized by Fourier-transform infrared spectroscopy, thermogravimetric analysis, and porous structure analysis. The effect of pH, contact time, the concentration of Cr(VI) and Cu(II), and initial Pb(II) concentration parameters on the adsorption of Pb(II) ions were investigated. The effective pH range for selective Pb(II) adsorption was in the region 3~8. The adsorption study showed that SG-GA had good adsorption efficiency for Pb(II), and the maximum adsorption capacity was 19.96 mg g –1 . The adsorption kinetics of Pb(II) followed the pseudo-second-order kinetic models and the adsorption isotherms fitted well by Langmuir models, these results implied that the absorption selectivity may be tuned by modifying the structural conformation for the sites of metal ion binding through complexion. This study provides interesting material for selectively and effectively remove Pb(II) from water effluents containing mixed metal salts.
研究领域:
环境化学
·
材料科学
·
分析化学
·
环境污染控制
·
重金属吸附
✓ 已验证
DOI
高影响因子
Current Computer-Aided Drug Design
·
2024
·
IF 1.5
Lingxiao Zhang,Chenghao Yang,Xinyue Ding,Hui Zhang,Yuling Luan,Yueer Tang,Zongjun Liu
Background: Berberine (BBR), also known as berberine hydrochloride, was isolated from the rhizomes of the Coptis chinensis. Studies have reported that BBR plays an important role in glycolipid metabolism, including insulin (IR). The targets, and molecular mechanisms of BBR against hyperlipid-induced IR is worthy to be further studied. Material and methods: The related targets of BBR were identified via Pharmmapper database and relevant targets of diabetes were obtained through GeneCards and Online Mendelian Inheritance in Man (OMIM) database. The common targets were employed with the STRING database and visualized with the protein-protein interactions (PPI) network. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis was performed to explore the biological progress and pathways. In vitro, human hepatocellular carcinomas (HepG2) cell was used as experimental cell line, and an insulin resistant HepG2 cell model (IR-HepG2) was constructed using free fatty acid induction. After intervention with BBR, glucose consumption and uptake in HepG2 cells were observed. Molecular docking was used to test the interaction between BBR and key targets, and real-time fluorescence quantitative PCR was used to detect the regulatory effect of BBR on related targets. Results: 262 overlapped targets were extracted from BBR and diabetes. In the KEGG enrichment analysis, the peroxisome proliferator activated receptor (PPAR) signaling pathway was included. In vitro experiments, BBR can significantly increase sugar consumption and uptake in IR HepG2 cells, while PPAR inhibitors can weaken the effect of BBR on IR-HepG2. Conclusion: The PPAR signaling pathway is one of the important pathways for BBR to improve high-fat-induced insulin resistance in HepG2 cells.
研究领域:
药理学
·
分子生物学
·
内分泌学
·
转化医学
·
代谢疾病研究
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）