FUEL PROCESSING TECHNOLOGY
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2021
·
IF 7.033
Yilun Sun,Meng Huang,Jingpeng Li,Zhiyuan Wang,Jianxin Zhou
The coke in the coils has a serious impact on the long-term and stable operation of the ethylene plant . Inhibiting coking of the cracking furnace is an important issue. In this paper, the Cr/CeO 2 coatings were prepared on the surface of 310S stainless steel by high-velocity oxygen-fuel (HVOF) spraying. The anti-coking performances of the bare 310S specimen and the Cr/CeO 2 coatings were tested by using the pyrolysis of naphtha . The results show that the coating with the thickness of 10–15 μm and a very small number of pores was built up by the obviously deformed splats and the coating/substrate interface is jagged bond. The white area on the surface of Cr/CeO 2 coatings mainly includes CeO 2 . However, the gray area is made of Cr or Cr 2 O 3 . Compared with the bare 310S specimen, the coking inhibition rates of coatings are 48.7%, 58.9%, 76.1% and 88.9% when the ratio of Cr and CeO 2 powder is 19:1, 9:1, 4:1 and 3:2, respectively. With increasing the relative ratio of CeO 2 , more white areas without coke are exposed. The CeO 2 surface can not only inhibit catalytic coking, but also promote the reaction of water vapor and coke.
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BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS
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2019
·
IF 2.54
Bo Pang,Xinyu Bian,Junpeng Xing,Shu Liu,Zhiqiang Liu,Fengrui Song
The abnormal aggregation of human islet amyloid polypeptide (hIAPP) is a crucial pathogenic factor associated with type 2 diabetes (T2D). The development of effective inhibitors to prevent hIAPP aggregation is a common therapeutic strategy against T2D. Lithospermic acid (LA) is a natural compound with diversified biological activities. In this study, electrospray ionization coupled with ion mobility–mass spectrometry, thioflavin T fluorescence assay , Congo red binding assay, Nile red fluorescence assay, circular dichroism spectroscopy, transmission electron microscopy , cell toxicity, lactate dehydrogenase assay (LDH) assay and molecular docking were combined to explore the influence of LA on hIAPP aggregation. Results showed that LA had favorable binding affinity to hIAPP and formed hIAPP–LA complexes, which could alter the relative abundance of the compact and extended conformers and promoted the transition of extended structures to compact conformers. LA also displayed strong inhibitory actions on fibrillation and potential protective effects against hIAPP-induced cell toxicity. Therefore, the obtained results were useful to understand the possible inhibitory mechanism of LA on hIAPP aggregation and provided valuable reference for the screening of potent amyloid inhibitors.
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PubMed
高影响因子
MATERIALS LETTERS
·
2019
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IF 3.019
Dayan Xie,Kuibao Zhang,Weiwei Li,Baozhu Luo,Haibin Zhang
Lanthanum chromite (LaCrO 3 ) is a promising functional material because of its high melting point, high thermal conductivity and excellent fire resistance. In this study, LaCrO 3 was successfully prepared by self-propagating high-temperature synthesis (SHS) method using CrO 3 and Cr as the oxidant and reductant. The optimum mole ratio of La 2 O 3 , Cr and CrO 3 was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that the LaCrO 3 powder with acceptable purity and good morphology was obtained when Cr and CrO 3 are 10% excess over La 2 O 3 . The real temperature of SHS system reaction was recorded by paperless recorder. The particle size distribution of the SHS prepared LaCrO 3 powder demonstrates median diameter of 1040 nm according to laser particle size spectrometer.
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高影响因子
COLORATION TECHNOLOGY
·
2019
·Vol. 135
·期 6
·451-466
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IF 1.241
Hongbin Li,Xiangwei Feng,Wenying Shi,Haixia Zhang,Qiyun Du,Longwei Qin,Xiaohong Qin
Hydrophobic polyvinylidene fluoride (PVDF) hollow fibre composite membranes were prepared by the dilute solution coating process to build a special surface structure that was similar to the dual micro-nano structure on the lotus leaf. Poly(vinylidene fluoride-co-hexafluoropropene) was chosen as the hydrophobic polymer candidate in dilute solution. Membrane morphology and surface hydrophobicity were evaluated by scanning electron microscopy and dynamic water contact angle measurement. The prepared PVDF hollow fibre membranes were employed to separate dyes (Congo Red and Methylene Blue) from water by vacuum membrane distillation. The effects of operational conditions (feed temperature, vacuum pressure and feed flow rate) on the vacuum membrane distillation performance of different PVDF membranes were investigated. The results indicated that the water contact angle values of PVDF composite membrane surfaces improved from 93.6° to 130.8°, which was mainly attributed to the formation of micro-nano rods. This structure was similar to the dual micro-nano structure on the lotus leaf. Under test feed temperature, vacuum pressure and feed flow rate conditions, the dye rejection rate of Congo Red and Methylene Blue by the hydrophobic PVDF hollow fibre membrane remained above 99.5% and 99%, which was higher than that of the pristine PVDF membrane (99% and 98%, respectively). In addition, the hydrophobic PVDF hollow fibre composite membrane showed higher permeation flux under different conditions compared with the pristine PVDF membrane, which was attributed to membrane surface hydrophobicity and the electrostatic interactions between dyes and the PVDF membrane surface.
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TALANTA
·
2019
·
IF 4.916
Xiao-Dong Sun,Hai-Long Wu,Zhi Liu,Yue Chen,Jun-Chen Chen,Li Cheng,Yu-Jie Ding,Ru-Qin Yu
Chemometrics multivariate calibration coupled with high performance liquid chromatography-diode array detection (HPLC-DAD) analytical strategy was applied for fast and sensitive quantification of the eight small molecules (uric acid, creatinine, tyrosine, homovanillic acid , hippuric acid, indole-3-acetic acid, tryptophan and 2-methylhippuric acid) in human urine. The objective of this work was to get the successful resolution of the complex matrix with minimum experimental time in the presence of highly overlapping peaks, of distortions in the time and baseline aspects among chromatograms, and of the presence of unknown and background interferences. All the analysis were based on a short C18 column with the chromatographic system operating in isocratic mode and all analytes can be successfully quantified within 6 min. The second-order HPLC-DAD data acquired were handled intelligently by two typical chemometrics tools including alternating trilinear decomposition (ATLD) and multivariate curve resolution-alternating least squares (MCR-ALS). Reasonable resolution and satisfactory quantification results were obtained regardless of the complex matrix interferences from the urine samples and the second-order advantage was fully exploited. With the validation by classic HPLC method, the proposed strategy could take extra advantages such as increased selectivity and sensitivity, shorter analysis time, undemanding elution conditions and sufficiency of lower limit of quantification benefit from multivariate calibration. The method was shown as a promising means for fast and sensitive determination of small molecules in human urine and also for fast diagnosis or surveillance in related diseases.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Liang Shen,Ziheng Jin,Wenhao Xu,Xia Jiang,Yue-xiao Shen,Yuanpeng Wang,Yinghua Lu
Organic dyes have been considered as persistent pollutants to the water environment and remain a challenge for industrial wastewater treatment. Here we integrated environmental biotechnology and adsorption technique into a highly porous, reactive hydrogel based material composed of live Shewanella xiamenensis BC01 encapsulated within reduced graphene oxide network (BC01-BGH). Because of the synergetic effects of adsorption and biodegradation, BC01-BGH showed exceptional decolorization performance of decomposing model anionic and cationic dyes, i.e., Congo red (CR) and methylene blue (MB), with efficiencies up to 99.8 and 97.3% in 55 h, respectively. Through a series of characterizations along the degradation process, we found that the hydrogel network provided universal adsorption to those dyes via joint electrostatic interaction, chemical interaction and π–π interaction with the assistance of the immobilized BC01, leading to the enhanced decolorization. The system did not require additional carbon sources and the resulting products, basically benzidine and anilines, were readily oxidized by ClO2 to a COD level below 60 mg/L. These results help bridge the knowledge gap of the bacteria encapsulation as a potential scale-up technology to clean up various dyes in wastewaters.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Zhen Liu,Gui Chen,Fa Zhou,Jianhan Huang
Herein, imidazolium salt incorporated poly(N-vinylimidazole-co-ethylene glycol dimethacrylate) was developed for adsorption of Congo Red (CR) and Hg2+ from aqueous solution. By the introduction of N-vinylimidazole and p-dichloroxylene on the skeletons, this polymer contained not only ionized imidazole moieties but also plenty of mesopores, endowing the polymer with excellent adsorption of CR and Hg2+. The maximum capacity at 298 K reached 503.0 and 240.0 mg/g, respectively. The Langmuir model described the equilibrium data well, and a chemical interaction in forms of electrostatic interaction, hydrogen bonding, and chelating interaction was involved in the adsorption with adsorption enthalpies of 9.99 and 17.28 kJ/mol, respectively. The adsorption was a fast process, and less than 20 min was sufficient to attain the equilibrium with pseudo-second-order rate constants of 4.003 × 10–3 and 9.830 × 10–4 g/(mg·min), respectively.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Guang Yang,Qiang Huang,Defu Gan,Hongye Huang,Junyu Chen,Fengjie Deng,Meiying Liu,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
The removal of environmental pollutants from wastewater through adsorption has regarded as one of the most efficient methods. A number of adsorbents based on nanomaterials and their composites have been examined for this purpose. Among them, carbon nanotubes (CNT) should be one of the promising candidates owing to their small size, large π conjugation system and high specific surface areas, however, the performance of CNT for adsorption is largely impeded by their poor dispersibility and lack of functional groups. Therefore, the development of simple and effective surface modification strategies to overcome the above drawbacks should be of great importance for their practical utilization in the environmental fields. In this study, a novel and simple biomimetic method was reported for the first time for surface modification of CNT with poly(ionic liquids) through the combination of mussel-inspired chemistry and subsequent surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization. An ionic liquid ([C 16 VIm + ] [Br − ]) was used as the monomer in this work because it is capable of introducing charged functional groups on the surface of CNT and thus boosts their adsorption performance towards environmental pollutants. As a model organic dye, Congo red (CR) was selected as the environmental pollutant and its adsorption behaviors of CR by CNT@IL composites were examined and analyzed in details. The results demonstrated that the adsorption capacity of CNT@IL intake CR (50 mg L −1 ) was obvious higher than that of unmodified CNT and the adsorption capacity reaches 178 mg g −1 with pH = 7 at 56 min. In addition, adsorption kinetic models and isotherm models were investigated to identify the adsorption kinetic rates and adsorption behavior, respectively. The adsorption principle that including electrostatic interaction, π-π interaction between imidazole rings on the surface of CNT@IL and CR, was proposed. This novel biomimetic surface modification could also be utilized for fabrication of many other functional materials with designable properties and improved performance. Therefore, this work will open up a new research avenue for the fabrication of multifunctional CNT based polymer composites.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Mengdi Bai,Xiaoli Wang,Baoming Li
Congo red doped poly(3,4-ethylene dioxythiophene) with loose granular morphology and some clear channels was synthesized by chemical oxidative polymerization using congo red as dopant and surfactant, and the formation mechanism of its morphology was confirmed by means of fourier transform infrared spectrum , X-ray diffraction, UV–Vis absorption spectrum and scanning electron microscope. The influences of feeding molar ratio of congo red to ethylene dioxythiophene on its electrochemical properties were discussed by cyclic voltammetry , galvanostatic charge-discharge and electrochemical impedance spectroscopy . The results showed that the maximum specific capacitance of congo red doped poly(3,4-ethylene dioxythiophene) could reach 206 F/g when the feeding molar ratio of congo red to ethylene dioxythiophene was 0.08:1, which was 58% higher than that of poly(3,4-ethylene dioxythiophene). The improved specific capacitance of congo red doped poly(3,4-ethylene dioxythiophene) could be due to its special molecular structure and loose granular morphology with some clear channels.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Zhouliangzi Zeng,Jiafei Lyu,Peng Bai,Xianghai Guo
In this work, seven metal–organic frameworks [ZIF-8, MIL-53(Cr), MIL-96(Al), MIL-100(Cr), MIL-100(Fe), MIL-101(Cr), and UiO-66 ] were applied for adsorptive separation of fructose–glucose mixture. UiO-66 exhibited better performance in adsorption capacity and selective adsorption of fructose. The adsorptive process with UiO-66 was further investigated in detail including kinetic, isotherm, and adsorption mechanisms. The rate-determining step analysis based on film diffusion and intraparticle diffusion model suggested that the adsorption process was controlled by multiple steps, which fitted the pseudo-second-order model. The Freundlich model was fitting better than the Langmuir model, which indicated multilayer adsorption on heterogeneous surface. The thermodynamic parameters (ΔG, ΔH, and ΔS) were calculated, indicating that adsorption process on UiO-66 was an endothermic and entropy increment process. UiO-66 can be a promising adsorbent for adsorptive separation of fructose and glucose.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Huimin Zhang,Yang Ruan,Yong Feng,Minhua Su,Zenghui Diao,Diyun Chen,Li'an Hou,Po-Heng Lee,Kaimin Shih,Lingjun Kong
Aluminum hydroxide and oxide have been widely used for decontamination due to their environmentally friendly nature and cost effectiveness. Aluminum (hydro) oxides are the main phases of aluminum-derived environment materials. Herein, the solvent-free hydrothermal synthesis of gamma-aluminum oxide (γ-Al 2 O 3 ) nanoparticles and phase transformation of AlOOH into γ-Al 2 O 3 are reported. Hydrothermal treatment of NH 3 ·H 2 O-induced aluminum precipitate resulted in the formation of AlOOH, which was an intermediate product of γ-Al 2 O 3 . AlOOH was transformed into highly crystalline 20-nm γ-Al 2 O 3 particles through calcination at 500 °C due to dehydration. The transformation was confirmed through X-ray diffraction (XRD) and thermogravimetric (TG) analyses. The resulting γ-Al 2 O 3 had superior adsorption ability for the anionic Congo red (CR) dye than for the cationic methylene blue (MB) and malachite green (MG) dyes. The selective adsorption ability of CR instead of MB was attributed to the electrostatic attraction and hydrogen bonds between the amino group and azo double bond of CR, and between the amino group and hydroxyl group in γ-Al 2 O 3 . Thus, this study investigated crystalline phase transformation into γ-Al 2 O 3 and selective adsorption capacity of CR, which provides important information regarding the synthesis of crystalline γ-Al 2 O 3 adsorbent, with selective adsorption ability for decontamination applications.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Fengping Wang,Wanming Zhang,Xiaohong Tan,Zhibao Wang,Yaxin Li,Wei Li
In the present study, catalytically active Ag nanoparticles were biosynthesized by the extract of Ginkgo biloba leaves through a facile and green manner. Well-dispersed Ag nanoparticles in spherical shape with size of 20–40 nm were obtained. Catalyzing the reduction of four typical pollutants, 4-nitrophenol, congo red, methyl orange, and rhodamine B , were achieved using the synthesized Ag nanoparticles, with the full conversion in 15–100 min. The pseudo-first order rate constant was calculated to be 0.0452 min −1 , 0.0568 min −1 , 0.0805 min −1 , and 0.285 min −1 for 4-nitrophenol, congo red, methyl orange, and rhodamine B, respectively. Furthermore, the catalytic activity can be preserved for 5 successive cycles. Wide applications in selective reduction reactions for pollutants treatment and fine chemical synthesis can be expected using the obtained catalytically active and recyclable Ag nanoparticles.
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