MICROCHIMICA ACTA
·
2011
·Vol. 175
·期 3
·341-346
·
IF 2.578
Jiang Xinyu,Zhang Hui,Chen Xiaoqing
We report on the determination of bisphenol A and 2-naphthol in water samples using ionic liquid cold-induced aggregation dispersive liquid-liquid microextraction combined with HPLC. Parameters governing the extraction efficiency (disperser solvent, volume of extraction and disperser solvent, pH, temperature, extraction time) were optimized and resulted in enrichment factors of 112 for bisphenol A and of 186 for 2-naphthol. The calibration curve was linear with correlation coefficients of 0.9995 and 0.9998, respectively, in the concentration range from 1.5 to 200 ng mL −1 . The relative standard deviations are 2.3% and 4.1% (for n = 5), the limits of detection are 0.58 and 0.86 ng mL −1 , and relative recoveries in tap, lake and river water samples range between 100.1 and 108.1%, 99.4 and 106.2%, and 97.1 and 103.8%, respectively.
IL-CIA-DLLME has a high enrichment factor (112, 186), acceptable relative recovery (97.1%–108.1%), good repeatability (2.3%, 4.1%) and a wide linear range(1.5–200 ng mL −1 ) for the determination of bisphenol A and 2-naphthol.
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高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 11
·1777-1788
·
IF 11.534
Niu Xiang,Jian Xiaodong,Gong Weiping,Liang Wei,Gong Xuetian,Zhang Guangzu,Jiang Shenglin,Yu Kun,Zhao Xiaobo,Yao Yingbang,Tao Tao,Liang Bo,Lu Sheng-Guo
Solid-state cooling technology based on electrocaloric effect (ECE) has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming gases. However, the development in high ECE materials is still a challenge. In this work, polarization merging strategy was proposed to achieve a large ECE in x Ba(Sn 0.07 Ti 0.93 )O 3 -( 1 − x )Ba(Hf 0.1 Ti 0.9 )O 3 ferroelectric ceramics, where x = 0, 0.2, 0.4, 0.6, 0.8, and 1. Ba(Sn 0.07 Ti 0.93 )O 3 with an orthorhombic phase and Ba(Hf 0.1 Ti 0.9 )O 3 with a rhombohedral phase at room temperature were prepared beforehand as precursors, and phase-coexisted x BSnT-(1− x )BHfT ceramics were formed via a solid-state reaction approach. Phase coexisting structures were confirmed using the X-ray diffraction. The merged polarization was confirmed by the dielectric and ferroelectric properties. Optimal ECEs were obtained for 0.2BSnT-0.8BHfT ceramics, i.e., adiabatic temperature change Δ T = 2.16±0.08 K at 80 °C and 5 MV/m, and Δ T = 3.35±0.09 K at 80 °C and 7 MV/m.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 21
·期 14
·8620-8630
·
IF 2.757
Gao Huipeng,Ma Jing,Xu Li,Jia Lingyun
Organic matter (OM) plays a vital role in controlling polycyclic aromatic hydrocarbon (PAH) bioavailability in soils and sediments. In this study, both a hydroxypropyl-β-cyclodextrin (HPCD) extraction test and a biodegradation test were performed to evaluate the bioavailability of phenanthrene in seven different bulk soil/sediment samples and two OM components (humin fractions and humic acid (HA) fractions) separated from these soils/sediments. Results showed that both the extent of HPCD-extractable phenanthrene and the extent of biodegradable phenanthrene in humin fraction were lower than those in the respective HA fraction and source soil/sediment, demonstrating the limited bioavailability of phenanthrene in the humin fraction. For the source soils/sediments and the humin fractions, significant inverse relationships were observed between the sorption capacities for phenanthrene and the amounts of HPCD-extractable or biodegradable phenanthrene ( p < 0.05), suggesting the importance of the sorption capacity in affecting desorption and biodegradation of phenanthrene. Strong linear relationships were observed between the amount of HPCD-extractable phenanthrene and the amount degraded in both the bulk soils/sediments and the humin fractions, with both slopes close to 1. On the other hand, in the case of phenanthrene contained in HA, a poor relationship was observed between the amount of phenanthrene extracted by HPCD and the amount degraded, with the former being much less than the latter. The results revealed the importance of humin fraction in affecting the bioavailability of phenanthrene in the bulk soils/sediments, which would deepen our understanding of the organic matter fractions in affecting desorption and biodegradation of organic pollutants and provide theoretical support for remediation and risk assessment of contaminated soils and sediments.
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高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 6
·1817-1825
·
IF 4.58
Li Qiu-Lin,Huang Fang,Wang Xiao-Li,Wang Xia,Zhao Ru-Song
The high performance solid-phase microextraction (SPME) of polar phenols from aqueous matrices is a challenge due to the strong interaction between water molecules and polar phenols. The authors describe the fabrication of stainless steel fibers coated with multiple helix 3D metal-organic nanotubes via physical adhesion, and their application to the SPME of 2-chlorophenol, 2-nitrophenol, 2,4-dichlorophenol, 4-chloro-3-methylphenol and 2,4,6-trichlorophenol from water samples. GC/MS was used for sample quantification and detection. Box-Behnken design was adopted to optimize the experimental conditions through response surface methodology. The fibers display good thermal stability (~400 °C), high enrichment factors (418–1874), excellent repeatability (4.31%–8.37%), wide linear range (0.5–1000 ng⋅L −1 ) and low limits of detection (0.07–0.18 ng⋅L −1 ) for the phenols. This method was successfully applied to the analysis of phenols in environmental water samples.
Multiple helix 3D metal-organic nanotubes coated stainless steel fibers were fabricated. The fibers achieved good thermal stability (~400 °C), high enrichment factors (418–1874), excellent repeatability (4.31–8.37%), wide linear range (0.5–1000 ng L −1 ) and low limits of detection (0.07–0.18 ng L −1 ) for phenols.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 8
·4831-4846
·
IF 4.21
Li Huimin,Li Zhengrui,Liu Yixin,Li Minghua
Abstract Recently plant extracts with intrinsic properties of green, safe and eco-friendly were more often integrated with textiles to endow the fabric with multi-functions such as anti-microbial, anti-oxidation and anti-ultraviolet. Therefore, it is worthwhile to study the role of active constituents in plant extracts on the functionalization of textiles. Herein, Scutellaria baicalensis (chinese skullcap) extracts (SBE) and its main active ingredient, baicalin, were effectively combined with linen fabric by means of impregnation and ultrasonic treatment respectively. The treated linen fabrics were characterized by SEM, FTIR, XRD, TGA, DTG analysis and the relevant functions such as anti-microbial activity, antioxidant activity and ultraviolet protection ability as well as durability of functionalities were also comparatively assessed. It was found that even with the same content of baicalin, the corresponding functions of the linen fabric treated by SBE are obviously better than treated by baicalin. The advantages of the SBE over just baicalin on the functionalization of linen fabric was analyzed and verified by experiments. The conclusion of this work will guide the quantitative addition of plant extracts on textile functional treatment. Graphic abstract
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 14
·7911-7927
·
IF 4.21
Li Mingfu,Yi Liu,Bin Luo,Zhang Qingtong,Song Junlong,Jiang Hongrui,Chen Changzhou,Wang Shuangfei,Min Douyong
Lignin, as a main factor inhibiting the enzymatic hydrolysis of lignocellulose, was investigated by comparing lignin isolated from untreated and pretreated lignocellulose to elucidate the differences in the enzyme adsorption ability. The nonproductive adsorption of cellulase on lignin was investigated by using a quartz crystal microbalance with dissipation. The results indicated that more cellulase adsorbed on the lignin isolated from autohydrolysis and green liquor-pretreated lignocellulose than on protolignin. Higher temperature and enzyme concentration increased the initial adsorption rate and the amount of enzyme adsorbed on lignin. A dynamic equation for enzyme adsorption on lignin was established. The adsorption of enzymes on lignin increased as the content of phenolic hydroxyl groups, and β-β and β-5 linkages in the lignin increased, attributed to enhanced hydrogen bonding and hydrophobic interaction. Consequently, inhibition of the enzymatic hydrolysis of cellulose was promoted by a higher phenolic hydroxyl group, β-β, and β-5 content. The adsorption of the enzyme components on lignin followed the order: β-glucosidase > xylanase > endo -glucanase > cellobiohydrolase, as revealed by polyacrylamide gel electrophoresis analysis. Electrostatic interaction increased the adsorption of β-glucosidase and xylanase on lignin, while synergistic hydrophobic interaction and hydrogen bonding increased the adsorption of endo -glucanase and cellobiohydrolase on lignin. The results indicate that the adsorption of enzymes on lignin is affected by the structure of lignin and the composition of the enzymes. The findings of the current study provide fundamental knowledge for improving the enzymatic conversion of lignocellulose.
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高影响因子
CHINESE SCIENCE BULLETIN
·
2014
·Vol. 59
·期 11
·1097-1103
·
IF 1.365
Liu Juan,Liu Zhengping,Wang Liyuan,Sun Haiyan
Calix[4]resorcinarene, prepared by the acid-catalyzed condensation of resorcinol and paraldehyde, was used as the core of the molecular glass compound. The hydroxyl groups of calix[4]resorcinarene were partly protected by tert-butoxycarbonyl ( t -BOC) and then esterified with 2-diazo-1-naphthoquinone-4-sulfonyl chloride (2,1,4-DNQ-Cl). Upon irradiation to 365 nm light, the 2,1,4-DNQ groups undergo photolysis to generate a small quantity of sulfonic acid other than indene carboxylic acid. The generated sulfonic acid can further catalyze the deprotection of the t -BOC group. So, a new type of single-component chemically amplified i-line positive photoresist can be formed by the molecular glass compounds. The lithographic performance of the resist was evaluated with high resolution and photosensitivity with an i-line stepper.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 91
·期 1
·216-224
·
IF 1.986
Ni Henmei,Pan Mingzhen,Shi Kai,Zhou Jinhui,Wu Min
In this paper, the feasibility was demonstrated to turn Liesegang patterned gelatin hydrogel into the multi-pulsed drug release system. Calcium hydrogen phosphate (CaHPO 4 ) crystals were selected as the Liesegang rings (LRs) materials. The structure of CaHPO 4 /gelatin was well tailored by adding the sodium dodecyl benzene sulfonate (SDBS) micelles or SDBS/cholesterol microcapsules. As a result, the completely isometric CaHPO 4 /gelatin LRs were prepared. The enzymolysis of gelatin with isometric LRs and cholesterol/SDBS microcapsules was carried out by using typsin. A stepwise kinetic curve of enzymolysis was obtained due to the obstacles of CaHPO 4 rings. This result indicated that CaHPO 4 /gelatin LRs were potentially a versatile platform for the multi-pulsed release of various drugs.
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高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 11
·1-9
·
IF 5.7
Wang Jiaying,Wang Xianliang,Li Bin,Zhang Kai,Mao Jingyuan
An electrochemical biosensor is reported for controlling CRISPR/Cas12a activity through the utilization of entropy-driven reactions, alongside the construction of a highly sensitive biosensor for B-type natriuretic peptide (BNP) detection. In the biosensor, entropy-driven reactions are employed to regulate the activity of CRISPR/Cas12a - a gene editing tool - capable of nonspecific cleavage of single-stranded DNA (ssDNA). The biosensor architecture encompasses an electrode that is modified with ssDNA probes designed to hybridize with target BNP aptamers. These aptamers, furnished with labeled ssDNA triggers, facilitate the activation of CRISPR/Cas12a through interaction with its guide RNA. Upon the presence of BNP, it associates with the aptamers, subsequently liberating the triggers that instigate the entropy-driven reactions. As a consequence of these reactions, more stable duplexes emerge between the triggers and guide RNA, thereby activating CRISPR/Cas12a. The activated CRISPR/Cas12a subsequently executes cleavage of ssDNA probes residing on the electrode surface, culminating in the generation of an electrochemical signal directly (the calibration plots of differential pulse voltammetric detection were acquired at a working potential of 0.2 V (vs. ref. electrode)) proportional to the BNP concentration. Validation of the biosensor’s performance is undertaken, wherein BNP detection is demonstrated in both buffer and human serum samples. Evident in the findings is the biosensor’s discernible sensitivity and specificity for BNP detection, exemplified by a detection limit of 13.53 fM and a lack of interference originating from other cardiac biomarkers, respectively. Furthermore, the biosensor’s potential to discriminate between healthy individuals and those afflicted by heart failure, predicated on distinctive BNP levels, is illustrated. Graphical Abstract
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PubMed
高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 14
·期 6
·1-12
·
IF 4.053
Li Wenyue,Chen Min,Zhong Zhaoxiang,Zhou Ming,Xing Weihong
High-concentration industrial wastewater containing N,N -dimethylacetamide (DMAc) from polymeric membrane manufacturer was degraded in Cu 2 O NPs/H 2 O 2 Fenton process. In the membrane-assisted Fenton process DMAc removal rate was up to 98% with 120 min which was increased by 23% over the batch reactor. It was found that ·OH quench time was extended by 20 min and the maximum ·OH productivity was notably88.7% higher at 40 min. The degradation reaction rate constant was enhanced by 2.2 times with membrane dispersion ( k = 0.0349 min −1 ). DMAc initial concentration ( C 0 ) and H 2 O 2 flux ( J p ) had major influence on mass transfer and kinetics, meanwhile, membrane pore size ( r p ) and length ( L m ) also affected the reaction rate. The intensified radical yield, fast mass transfer and nanoparticles high activity all contributed to improve pollutant degradation efficiency. Time-resolved DMAc degradation pathway was analyzed as hydroxylation, demethylation and oxidation leading to the final products of CO 2 , H 2 O and NO 3 − (rather than NH 3 from biodegradation). Continuous process was operated in the dual-membrane configuration with in situ reaction and separation. After five cycling tests, DMAc removal was all above 95% for the initial [DMAc] 0 = 14,000 mg/L in wastewater and stability of the catalyst and the membrane maintained well.
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高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 2
·927-939
·
IF 5.044
Xiong Jun,Zhang Zhenning,Liu Yuhao,Yi Jie,Wang Yixin,Li Bowen,Wang Weiming,Peng Shuai,Min Xue,Gui Yunyun,Li Ming,Peng Junjun
Nowadays, freshwater shortage, energy crisis and environmental pollution are the three major threats to human beings. Bio-waste is an important source of environmental pollutant emissions and a renewable resource with great potential. Herein, we develop a photothermal material based on bagasse for solar steam generation to relieve the freshwater crisis and mitigate environmental pollution caused by bio-waste. The mainly functional part of the solar-driven steam generator here is bagasse-based photothermal aerogel (B-PTA), which composes of carbonized bagasse (CB) and bagasse-derived cellulose fiber (BDCF). The B-PTA relying on CB can effectively absorb sunlight (~ 95%), resulting in a prominent light-to-heat ability. The B-PTA with DBCF has super-hydrophilicity, water transport and retention ability. Depending on the excellent light absorption and 3D water passageway, the B-PTA gives a water evaporation rate of 1.36 kg m –2 h –1 , and achieves a photothermal conversion efficiency of 77.34% under 1-sun illumination (1 kW m –2 ). The B-PTA shows remarkable stability that the efficiency without significant change after 20 cycles. In addition, the B-PTA can effectively desalt seawater and purify dye wastewater with natural sunlight. Therefore, turning bio-waste into valuable photothermal material for solar steam generation is possible. Due to the merits of low cost, scalability, environmental friendliness, B-PTA has the potential for real-world water purification. Graphical abstract
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2010
·Vol. 86
·期 1
·38-42
·
IF 0.992
Yang Zhong-Zhi,Li Yong-Fang,Li Zhi-Chun,Gu Yu-Mei,Zhu Ya,Zhang Zhan-Jun
Five higher Chlorinated Benzenes (CBs), include Hexachlorobenzene (HCB), pentachlorobenzene (PeCB) and three isomers of tetrachlorobenzens, were analyzed in 20 outdoor dust samples collected from a fast developing city, Xinxiang. Only HCB was detected in all outdoor dust samples. The dominate part of the CBs residue in most samples was HCB and the mean HCB concentration (4.13 ng/g dry weight) in this study was in the range of global background soil HCB levels (ranging from 0.010 to 5.20 ng/g dry weight). The higher ratios of HCB/PeCB in the outdoor dust samples in the present study indicate that pesticide application may be an important source of HCB in China.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）