ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
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2016
·Vol. 22
·期 8
·1147-1155
·
IF 1.87
Habimana Fabien,Huo Yanxia,Jiang Sai,Ji Shengfu
Europium metal organic framework (Eu-MOF) was synthesized using Europium as metal ion center and 1,3,5-trimesic acid (H 3 BTC) as organic ligand under hydrosolvothermal conditions. The dynamic performance of the Eu-MOF material in adsorption desulfurization processes was investigated using a solution of thiophene/n-octane as sulfur containing quality model oil. The adsorption desulfurization kinetics equations and adsorption desulfurization isotherms of Eu-MOF were also studied. The results have shown that Eu-MOF catalyst has very good adsorption desulfurization abilities under optimum desulfurization conditions of m adsorbent : m model oil ratio of 1:100 and reaction temperature of 303 K. After 4 h of desulfurization reaction, the adsorption rate and the adsorption desulfurization capacity has reached 64.70% and 24.59 mgS/gMOF respectively. The Eu-MOF adsorption desulfurization process of thiophene on Eu-MOF fits well the quasi two level dynamic model using Langmuir isotherm, Freundlich isotherm and Dubinin–Radushkevich isotherm equations. The Dubinin–Radushkevich isotherm can be a suitable description of adsorption process for Eu-MOF absorbent on thiophene/n-octane mode oil. However the Freundlich isotherm equation model with fitting R
2 value closer to 1, can be a better description for the adsorption of thiophene. The adsorption of thiophene over Eu-MOF absorbent has two types of adsorption that occur simultaneously. These are the monolayer physical adsorption and the multilayer chemical adsorption.
研究领域:
材料科学
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环境化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2015
·
IF 1.098
Zhijuan Sun,Xiao Wang,Fei Guo,Chunyue Jiang,Qinmin Pan
Bio-sourced nylon 69, one of promising engineering plastics, has a great potential in developing sustainable technology and various commercial applications. Isothermal and nonisothermal crystallization kinetics of nylon 69 is a base to optimize the process conditions and establish the structure–property correlations for nylon 69, and it is also highly beneficial for successful applications of nylon products in industry. Isothermal and nonisothermal crystallization kinetics has been investigated by differential scanning calorimetry for nylon 69, bio-sourced even–odd nylon. The isothermal crystallization kinetics has been analyzed by the Avrami equation, the calculated Avrami exponent at various crystallization temperatures falls into the range of 2.28 and 2.86. In addition, the Avrami equation modified by Jeziorny and the equation suggested by Mo have been adopted to study the nonisothermal crystallization. The activation energies for isothermal and nonisothermal crystallization have also been determined. The study demonstrates that the crystallization model of nylon 69 might be a two-dimensional (circular) growth at both isothermal and nonisothermal crystallization conditions. Furthermore, the value of the crystallization rate parameter ( K ) decreases significantly but the crystallization half-time ( t 1/2 ) increases with the increase of the isothermal crystallization temperature. To nonisothermal crystallization, the crystallization rate increases as the cooling rate increases according to the analysis of Jeziorny's theory. The results of Mo's theory suggest that a faster cooling rate is required to reach a higher relative degree of crystallinity in a unit of time, and crystallization rate decreases when the relative degree of crystallinity increases at nonisothermal crystallization conditions.
研究领域:
材料科学
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聚合物科学
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产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2021
·
IF 2.917
Qing SHU,Chun-fa LIAO,Wen-qiang ZOU,Bao-quan XU,Yu-hui TAN
The adsorption characteristics and mechanisms of spirulina powder were investigated when it was used as adsorbent to recover ytterbium(III) from wastewater solution. Surface structure and element valence of the adsorbent were analyzed by SEM and XPS for the exploring of its adsorption mechanism for ytterbium(III). The adsorption characteristics of ytterbium(III) on spirulina powder was analyzed through assessing adsorption isotherm, kinetics and thermodynamic models. The adsorption isotherm data were best explained by Langmuir model, and the adsorption capacity of spirulina powder for ytterbium(III) was 72.46 mg/g when adsorption temperature was 318 K. The kinetic experiment results showed that the pseudo-second order kinetic model can better simulate the adsorption process of spirulina powder to ytterbium(III), indicating that the rate-controlling step was chemical adsorption. Spirulina can be an efficient and economical ytterbium(III) recycling material, because it showed good adsorption stability and reusability from the adsorption−desorption cycle experiment results.
研究领域:
环境科学
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生物技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
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2021
·
IF 2.826
Zhenzhen Yu,Kangle Ding,Chao Han,Yi Wu,Mei Zou,Yan Liu,Fujia Guan
A natural mud shale (MS) from Yichang Area, China was for the first time experimentally examined for its potential application to oily effluents treatment. The mineralogical compositions, surface structures and pore size distribution of the prepared MS particles were characterised using various advanced analytical technologies, respectively. The performance of the MS particles during the model diesel oil wastewater treatment was examined based on the designed adsorption experiments. Isothermal and kinetic features were investigated according to a variety of adsorption models. The results showed that some pores, cavities and fractures were distributed on the surface of MS particles. The efficiency of MS particles for removing diesel oil from the model oily effluent was associated closely with experimental conditions including the mass of MS particles, initial diesel levels, residence time and pH values. Equilibrium adsorption isotherms conformed to Langmuir model, indicating that the adsorption of diesel oil onto MS particles tended to monolayer adsorption. Kinetics of adsorption of diesel oil on MS complied with the pseudo-second-order model. This suggested that the whole oil removal rate was mainly controlled by chemisorption. Results of our study indicates potential utilisation of unmodified MS particles as an abundant and inexpensive adsorbent for low-concentration diesel oil wastewater.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Hanhua Li,Jiale Gao,Huiwen Xiong,Dilimulati Yishake,Lin Liu,Jilie Kong,Qin Chen,Xueen Fang,Wenhao Weng
Loop-mediated isothermal amplification (LAMP) holds great promise for rapid nucleic acid detection. However, its application is hindered by the notable occurrence of false positives. In this work, gold nanorod (AuNR)-mediated hot start effect, which adsorbs primers and controls the release of single-stranded DNA (ssDNA) primers at about 50 °C, was demonstrated. The AuNR-mediated LAMP reaction for detecting African horse sickness virus (AHSV) showed high selectivity against other DNA fragments, even at high magnesium concentrations. Furthermore, the assay achieves excellent sensitivity with a detection limit of 100 copies/μL. Additionally, the method displays good repeatability from 50 to 65 °C (optimal), and the coefficient of variation of Tt at the same concentration of nucleic acids is less than 5%. Our study optimizes the LAMP reaction using AuNRs, thereby reducing false positives and offering great potential for clinical diagnosis.
研究领域:
分子生物学
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生物传感
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临床诊断
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病毒检测
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纳米医学
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转化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Danping Chen,Yang Wang,Jun Chen,Yanfei Zhang,Zong Dai,Xiaoyong Zou
Active DNA demethylation process critically relies on the intrinsic properties of ten-eleven translocation proteins (Tets), particularly the flanking sequence preference. Challenged by the fact that the proximate bases to the 5-methylcytosine (5mC) are multitudinous and their influence on the Tets/DNA interplay is minute, the current methodologies are very limited in terms of cost, sensitivity and efficiency. Herein, we propose a polymerization retardation isothermal amplification (PRIA) strategy that enables sensitive and fast study of the flanking sequence preference of Tet. By arranging DNA polymerase to repetitively pass DNA strands through an isothermal replication-scission amplification reaction, the tiny difference in the Tet/DNA interplay can be consecutively accumulated and amplified. Low amount sample (80 ng) even multiple samples can be simultaneously analyzed within 10 h on an easily accessible laboratory real-time quantitative PCR instrument. For a proof-of-concept study, the binding preference ( P B ) of Tet2 for XmCGX, (X = C, G, T , A) was analyzed by PRIA and computational analysis, showing an order of AmCGT > TmCGA ≈ GmCGC > CmCGG. Furthermore, the binding and oxidation preference in Tet/DNA interplay process was individually considered. By comparative evaluation of the total flanking sequence preference ( P T ) and the P B , for the first time, we revealed that Tet2 has a lower oxidation preference ( P O ) to proximal flanking bases and the main contributor to P T of Tet2 is P B . The PRIA strategy, due to its reliable, cost-effective, high efficiency and low sample input, would hopefully advance epigenetic researches and other relative studies.
研究领域:
分子生物学
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表观遗传学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 2
·1328-1336
·
IF 1.395
Ting Wang,Yong Yang,Chuanzhi Zhang,Zhaobin Tang,Haining Na,Jin Zhu
A series of 1,3,5-trialkyl-benzenetricarboxylamides (BTA-Rs) with different side-chain lengths of n -alkyl are synthesized to use as nucleating agents of poly (lactic acid) (PLA). Crystallization rate of PLA is detailed discussed in nonisothermal melt-crystallization with addition of the synthesized nucleating agents. Among these BTA-Rs, BTA-n-butyl (BTA-nBu) shows the most excellent nucleation ability for PLA. The influences of BTA-nBu on the nonisothermal melt-crystallization and cold-crystallization from the glassy state, isothermal crystallization, crystalline structure, and spherulite morphology of PLA are investigated. It is found that 0.8 wt % is the optimal weight fraction of BTA-nBu to improve the crystallization of PLA. In the case of isothermal melt-crystallization from melt, the addition of BTA-nBu shortens the crystallization half-time and speeds up the crystallization rate of PLA with no discernible effect on the crystalline structure. Besides, BTA-nBu nucleated PLA exhibits smaller spherulites size and larger nucleation density than that of pure PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1328-1336, 2013
研究领域:
高分子科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Sai Bi,Yangyang Cui,Li Li
Considering the great significance of microRNAs (miRNAs) in cancer detection and typing, the development of sensitive, specific, quantitative, and low-cost methods for the assay of expression levels of miRNAs is desirable. We describe a highly efficient amplification platform for ultrasensitive analysis of miRNA (taking let-7a miRNA as a model analyte) based on a dumbbell probe-mediated cascade isothermal amplification (DP-CIA) strategy. The method relies on the circularization of dumbbell probe by binding target miRNA, followed by rolling circle amplification (RCA) reaction and an autonomous DNA machine performed by nicking/polymerization/displacement cycles that continuously produces single-stranded G-quadruplex to assemble with hemin to generate a color signal. In terms of the high sensitivity (as low as 1 zmol), wide dynamic range (covering 9 orders of magnitude), good specificity (even single-base difference) and easy operation (one probe and three enzymes), the proposed label-free assay is successfully applied to direct detection of let-7a miRNA in real sample (total RNA extracted from human lung tissue), demonstrating an attractive alternative for miRNA analysis for gene expression profiling and molecular diagnostics, particularly for early cancer diagnosis.
研究领域:
分子生物学
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医学诊断
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Mengist Minale,Awoke Guadie,Yiyang Liu,Yuan Meng,Xuejiang Wang,Jianfu Zhao
The need for an effective and efficient removal method for the combined pollution of antibiotics and heavy metals has attracted increasing attention. In this study, a novel manganese ferrite-loaded swine manure hydrochar was utilized to deal with chlortetracycline and lead in water. The SMHC was produced via the hydrothermal carbonization method and then modified with manganese ferrite (MnFe 2 O 4 ) nanoparticles using the coprecipitation method. The hybrid adsorbent (MnFe 2 O 4 -SMHC) exhibited high specific surface area, abundant functional groups, and excellent magnetic properties. The CTC adsorption data were fitted to both the Freundlich and Langmuir isotherm models, while that of Cd(II) was better fitted to the Langmuir isotherm model. The maximum removal capacities corresponding to CTC and Cd(II) adsorptions were 752.96 and 62. 16 mg g −1 , respectively. The removal of CTC was slightly promoted in the presence of low concentrations of Cd(II), while the presence of CTC showed antagonistic effects on the uptake of Cd(II). The spent MnFe 2 O 4 -SMHC was collected after adsorption using an external magnetic field for subsequent regeneration and reuse, and the result showed its excellent recyclability . In summary, MnFe 2 O 4 -SMHC exhibited excellent adsorption performance for CTC and Cd(II) removal in single and binary conditions, suggesting its potential application in water and wastewater remediation.
研究领域:
环境科学
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水处理
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Wei S. Zhang,Jianbin Pan,Feng Li,Min Zhu,Mengting Xu,Hongyan Zhu,Yanyan Yu,Gaoxing Su
The outbreak of the pandemic caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) calls for an urgent unmet need for developing a facial and cost-effective detection method. The requirement of well-trained personnel and sophisticated instrument of current primary mean (reverse transcription polymerase chain reaction, RT-PCR) may hinder the practical application worldwide. In this regard, a reverse transcription recombinase polymerase amplification (RT-RPA) coupled with CRISPR-Cas12a colorimetric assay is proposed for the SARS-CoV-2 detection. The methodology we have described herein utilizes DNA-modified gold nanoparticles (AuNPs) as a universal colorimetric readout and can specifically target ORF1ab and N regions of the SARS-CoV-2 genome. After the virus genome is amplified through RT-RPA, the resulting abundant dsDNA will bind and activate Cas12a. Under trans-cleavage degradation, the capped DNA substrate will be hydrolyzed gradually from AuNPs, demonstrating a change in the surface plasmon resonance (SPR), which can be facially monitored by UV–vis absorbance spectroscopy and naked eye observation. The high amplification efficiency from RT-RPA and Cas12a trans-cleavage process bring the sensitivity of our method to 1 copy of viral genome sequence per test. Notably, under the dual variations inspecting from the isothermal amplification and Cas12a activation process, the false positive events from other beta coronavirus members can be effectively avoided and thus significantly improve the specificity. Furthermore, the reliability of this colorimetric assay is validated by standard clinical samples from the hospital laboratory department. Through integration of the inherently high sensitivity and specificity from an RPA-coupled Cas12a system with the intrinsic simplicity of AuNP-based colorimetric assay, our method increases the practical testing availability of SARS-CoV-2.
研究领域:
分子生物学
·
病毒学
·
诊断学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 2
·429
·
IF 2.849
Qintao Yang,Liang Gong,Lili Huang,Qinglin Xie,Yijian Zhong,Nanchun Chen
A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2018
·
IF 0.609
Youzhou Zhou,Liuqin Ge,Neng Fan,Meisheng Xia
Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.
研究领域:
环境科学
·
生物工程
·
材料科学
·
化学工程
·
水污染控制
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）