Journal of CO2 Utilization
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2022
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IF 8.321
Qiqi Niu,Zhaoxia Dong,Qichao Lv,Fengfan Zhang,Hao Shen,Zihao Yang,Meiqin Lin,Juan Zhang,Kang Xiao
CO 2 enhanced oil recovery is the most realistic carbon capture, utilization, and storage (CCUS) technology to fit the green and low-carbon development concept. During CO 2 injection, gas channeling is a key problem to limiting displacement efficiency, and foam has shown great advantages in sealing channeling technology. However, conventional surfactant-stabilized CO 2 foam is difficult to maintain for a long time. In this paper, CO 2 foam was developed with a single long-chain viscoelastic surfactant (erucyl dimethyl amidopropyl betaine, EAB). Stability mechanism and dynamic evolution of structure were studied using multiple light scattering method. Then, the aggregation and adsorption behaviors of EAB were determined by rheology experiments, dynamic light scattering, cryogenic transmission electron microscopy, and dilatational rheology. The results showed EAB has excellent CO 2 foam performance, and initial volume and the half-life of foam could reach 330 mL and 272 min. Liquid drainage and bubble coalescence of foam were delayed due to the formation of viscoelastic liquid phase and interface. Liquid film thickness was maintained at about 10 µm after 2 h and interfacial dilational modulus was above 25 mN/m, which showed high surface repair efficiency and liquid storage capacity. Apparent viscosity of EAB solution decreased from 89 to 15 mPa·s as the temperature increased, which accelerated the process of water evaporation and liquid drainage. Only enough EAB molecules could effectively reduce initial surface tension from 70 to 56 mN/m to ensure good interfacial properties of foam. At high salt concentration, surface adsorption process to reach equilibrium was extended from 300 to 1400 s and dilational modulus fluctuated between 5 and 20 mN/m, which indicated surface activity and surface repair ability of EAB were inhibited. This study can deepen the understanding of aggregation and adsorption behavior for viscoelastic surfactants and broaden their application in oilfield development.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Jialong Wu,Xiaozhen Ma,Pitchaimari Gnanasekar,Fan Wang,Jin Zhu,Ning Yan,Jing Chen
Superhydrophobic polyurethane foam is one of the most promising materials for oil-water separation. However, there are only limited studies prepared matrix superhydrophobic foams as adsorbents. In this paper, SiO 2 modified by 1H, 1H, 2H, 2H-perfluorododecyl trichlorosilane (F-SiO 2 ) was added into the lignin-based foam matrix by a one-step foaming technique. The average diameter of F-SiO 2 was about 480 nm with an water contact angle (WCA) of 160.3°. The lignin-based polyurethane foam with F-SiO 2 had a superhydrophobic water contact angle of 151.3°. There is no obvious change in contact angle after 100 cycles of compression or after cutting and abrasion. Scanning electron microscopy (SEM) analysis showed that F-SiO 2 was distributed both on the surface and inside of the foam. The efficiency for oil-water separation reached 99 %. Under the light intensity of 1 kW/m 2 , the surface temperature of the lignin-based foam rose to 77.6 °C. In addition, the foam exhibited self-cleaning properties and degraded within 2 h in an alcoholic alkali solution. Thus, in this study, we developed a novel matrix superhydrophobic lignin-based polyurethane foam with an excellent promise to be used as oil water separation adsorbents in industrial wastewater treatment and oil spill clean-up processes.
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PubMed
高影响因子
CARBON
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2022
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IF 11.307
Xiang Yu,Yue Zhan,Tingting Fan,Yuqi Zhang,Shunqin Liang,Limin Sun,Xiaoli Hu,Weiping Fang,Zhou Chen,Xiaodong Yi
The stabilization and transport of the reactants, intermediates and products are significant to rational design of an industrial catalyst. In this work, we encapsulated the surface of Pd/g-C 3 N 4 catalyst with acrylic acid (AA) using a photo-induced grafting method to mimic the 3-dimensional nature of enzymes. A combined characterization and ab initio calculation revealed that AA ligands on the surface controlled the adsorption and diffusion behaviors of the reactants, rather than alter the electronic or geometric properties of Pd active centers. The optimized catalyst (Pd/CNA-4) significantly enhances isoprene partial hydrogenation activity without a decline in semi-hydrogenation selectivity. This approach can be further optimized by changing the types of the encapsulating ligands and can meet other specific catalytic reactions to regulate their conversion and selectivity and is therefore expected to extend to other areas of heterogeneous catalysis .
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Yuchen Zhu,Jian Xu,Haiyan Zhang,Aodong Zhang,Boxin Chen,Bin Zhao,Lei Li,Xuhong Qian,Ya Cheng,Fei Feng
A novel micro gas chromatography column (μGCC) with straight-sided elliptic microchannel cross sections was prepared by ultrafast laser-assisted chemical etching inside a glass substrate . The straight-sided elliptic cross sections resulted in a uniform distribution of the flow velocity field . This uniform distribution and the use of a microchannel with a consistent composition led to a uniform stationary phase coating. Upon the separation of a test mixture of C7–C11 alkanes, highly symmetrical chromatographic peaks were obtained. The tailing factors of the chromatographic peaks ranged from 0.95 to 1.05, which satisfies the relevant provisions of Pharmacopoeia of the People's Republic of China (ChP). The test results show that the improvement of the tailing factors is mainly due to the optimization of the cross-section structure rather than the optimization of the test conditions. Notably, due to the simple preparation processes and the low cost of the glass substrate, the total manufacturing cost of this novel μGCC is low.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Shiyu Zhang,Runnan Zhang,Runlai Li,Zixuan Zhang,Yafei Li,Hao Deng,Junhui Zhao,Tianrun Gu,Mengying Long,Xiaoyao Wang,Sui Zhang,Zhongyi Jiang
Positively charged nanofiltration membranes hold great potential in Li + /Mg 2+ separation, but their application in alkaline solutions, such as alkaline salt-lake brines has not been reported. Herein, inspired by the arginine's unique structure and biological function, we explore superstrong basic triaminoguanidine (TG) molecule as aqueous monomer to fabricate positively charged polyamide nanofiltration membranes for Li + /Mg 2+ separation. With the Li + /Mg 2+ mass ratios of 1:50 and 1:120, at pH 9.6, the separation factors (S Li,Mg ) of membranes reach 31.8 and 20.9. Meanwhile, at pH 5.6, the S Li,Mg are 46.4 and 36.4, which are the ever-reported highest value and such high S Li,Mg can be well retained in the pH range of 5.6–8.6. The superior Li + /Mg 2+ selectivity stems from the superhigh protonation capacity of guanidine groups in a broad pH range.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
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2022
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IF 4.889
Danyang Cao,Jie Zhang,Yuxiang Nie,Shanshan Wang,Xin Feng,Jiahua Zhu,Xiaohua Lu,Liwen Mu
In this work, the natural lubricating components from Cork bark (CB) and Populus bark (PB) were obtained by catalytic reduction fractionation and liquid–liquid extraction. GC–MS, 2D-NMR, and GPC some techniques were used to characterize the chemical composition of the CB and PB extract. The main components of CB and PB are suberin-derived aliphatic and alkaloid, respectively. CB and PB extract have been demonstrated as efficient organic lubricating additives to reduce wear rate and stabilize friction coefficient of paraffin lubricant. Interestingly, the addition of CB or PB extract in paraffin shows better lubrication performance as compared with commercial lubricants. In addition, XPS results show that some compounds such as suberin-derived aliphatic and alkaloid from bark could enhance lubricating oil film to reduce friction and wear. Overall, this work will replace the conventional petroleum based lubricating additives and open a new application venue for bark to improve product value.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jie Zhou,Hao Liu,Chao Xiong,Peng Hu,Hao Wang,Xuyu Wang,Hongbing Ji
Propane dehydrogenation (PDH) has been a promising method to satisfy the increasing demand for propylene, but Pt-based catalysts always suffer from sintering and coke formation. Developing stable and efficient catalysts for PDH is of great significance for the industry. Herein, the paper reports that a catalyst with potassium-promoted Pt-In bimetallic clusters encapsulated in silicalite-1 (S-1) zeolite works as an efficient and stable catalyst for PDH. The catalyst achieves a propane conversion of 43.73 % with 97.14 % selectivity of propene and an extremely high propylene productivity of 20.33 mol g Pt -1 h -1 with a weight hourly space velocity (WHSV) of 6.75 h −1 . No obvious deactivation occurs after 48 h on stream, affording an extremely low deactivation constant of 0.0025 h −1 . The introduction of indium species greatly improves the propene selectivity and restricts the coke formation. The introduction of K + into S-1 can significantly enhance the catalytic activity and the stability of the catalyst. The catalyst with excellent activity and stability is potential for industrial application.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2022
·Vol. 30
·期 11
·4835-4847
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IF 4.705
Guo Wei,Guo Ruibin,Pei Hebing,Wang Bingjie,Liu Nijuan,Mo Zunli
Electrospinning nanofiber membranes (ENMs) have received widespread attention owing to their favorable permeability, easy preparation, low energy consumption and stability in wastewater treatment technologies. Polyacrylonitrile/polyethyleneimine (PAN/PEI) ENMs were prepared by electrospinning and evaluated in batch experiments for their removal of heavy metal ions (Pb (II), Cr (VI) and Cu (II)) in water. The adsorption capacities of PAN/PEI ENMs for Cr (VI) ions, Cu (II) ions and Pb (II) ions can reach up to 262 mg g −1 , 325 mg g −1 and 346 mg g −1 , respectively. The adsorption procedure follows the pseudo-second-order dynamics model and Langmuir model. In dynamic experiments, the removal rates of Pb (II) ions, Cr (VI) ions and Cu (II) ions can reach 80%, 100% and 80%, indicating that it has excellent removal efficiencies for heavy metal ions. At the same time, PAN/PEI ENMs have high separation ability and excellent flux for oil–water mixtures and oil-in-water emulsions. PAN/PEI ENMs also have the advantages of simple preparation, easy recovery and no secondary pollution to the environment, indicating that PAN/PEI ENMs have some prospects for application in wastewater treatment.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Jian Li,Han Ma,Yaning Li,Zeyu Yang,Guibiao He,Boliang Wang
The gel network structure filled with attractive nanoparticles (NPs) significantly affects the viscoelasticity of the nanocomposites , which is poorly understood and troubles industrial processes. In this work, the nanoparticle gel matrices were prepared with hydrophilic fumed silica (FS), and filled with aluminium sub-microparticles (Al SMPs) loading in the range of 10%− 50%. The effects of particle content and composition on the large amplitude oscillatory shear (LAOS) behaviors are investigated by stress decomposition methods. Meanwhile, the higher harmonics and the Chebyshev harmonics coefficients were obtained. We found that the gels exhibit consistent progressive stiffening with particles filling, companying with plastic transformation and weak strain overshoot (WSO). With aluminum increasing, nonlinear viscoelastic responses gradually weaken in LAOS, severely decreasing the linear viscoelastic (LVE) region, and were validated by strain stiffening index S , T and high-order harmonics. In confocal microscopy (CFM) images, the aluminum particles were fluorescently labeled and found to be adhered together with FS clusters. This article could provide a perspective on understanding the flow mechanism of particulate network structure by combining morphological details and LAOS behaviors.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Chao Jiang,Yao Yang,Binbo Jiang,Jingyuan Sun,Zhengliang Huang,Zuwei Liao,Jingdai Wang,Yongrong Yang
Multiphase polypropylene is an important engineering plastic. Stickiness concerns in multiphase polypropylene particles with a high rubber content are well known, and they are not favorable to industrial production stability. However, there has been a scarcity of green and effective surface stickiness reduction techniques. In this work, a Damp mode was employed to construct multiple concentration zones at the particle scale, allowing the synthesis of polypropylene with a high rubber content, reduced particle surface stickiness, and dramatically increased copolymerization activity. The rubber content limit of the conventional gas-phase technique (designated as the Dry mode) was found to be approximately 30 wt % before the particles became sticky, whereas the rubber content limit of the Damp mode was found to be 45 wt %. More notably, early in the procedure, the gas-phase copolymerization activity was boosted by 86.7%. Furthermore, given the same rubber content, the impact strength and flexural modulus of the polymers synthesized in both modes and commercial resins were found to be essentially the same. Lastly, the polymer particles synthesized in Damp mode had a multizone structure with an EPR-rich core and an EPR-poor shell. This work establishes a new method for reducing the surface stickiness of multiphase polypropylene particles, paving the way for the manufacturing of high-performance polypropylene resins using ordinary polypropylene plants.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Tianrun Gu,Runnan Zhang,Shiyu Zhang,Benbing Shi,Junhui Zhao,Zhen Wang,Mengying Long,Guangzhe Wang,Ting Qiu,Zhongyi Jiang
The efficient separation of Li + /Mg 2+ is the key to lithium extraction from salt lake brine. Herein, a multi-amino quaternary ammonium salt (3,5-dimethylhydrazide-benzyl trimethyl ammonium bromide, DHTAB) was designed and synthesized to modify pristine polyamide (PA) nanofiltration membranes. DHTAB was grafted on the surface of the PA nanofiltration membrane to construct a positively selective layer for Li + /Mg 2+ separation. The introduction of DHTAB increased the membrane surface charge density to +5.16 mC m −2 , which was nearly three times that of the pristine PA membrane. The increased charge density of the modified membrane led to a stronger Donnan exclusion for Mg 2+ , and accordingly a high MgCl 2 rejection of 99.2%. The modified membranes exhibited a high Li + /Mg 2+ separation factor of up to 60.1, when applied for MgCl 2 and LiCl binary solution, which exceeded all known PA-based nanofiltration membranes.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yan Wang,Tao Yang,Jing Chen,Shaobin Wen,Die Li,Bingyu Wang,Qiang Zhang
A novel ferrocene-based nanofiltration membrane is prepared to combine filtration and photo-Fenton reaction for water treatment. Membranes containing ferrocene groups are successfully fabricated via an integration of layer-by-layer interfacial polymerization and ion exchange reaction. Rejection performance towards bisphenol S (BPS) increases with the growth of the interfacial polymerization layer, and the optimal membrane shows the highest rejection rate of 98.1%. For the optimal photo-Fenton system with H 2 O 2 , UV and ferrocene-based membrane (PS/HTCC-3/FcSO 3 ), the degradation rate of k is 0.092 min −1 , which is 1.8 times higher than that of the system with only H 2 O 2 and UV. Meanwhile, the salinity of BPS in the optimal system is 2 times higher than that of the system with H 2 O 2 and UV. After the heterogeneous photo-Fenton process, PS/HTCC-3/FcSO 3 can reject 65.6% of the BPS degradation by-products based on the variation of total organic carbon (TOC). In addition, quenching experiments prove that ·OH is the primary active radical, and the yield of ·OH in the optimal system is the highest compared with the system with H 2 O 2 and UV. The outstanding performance of ferrocene-based membrane demonstrates its potential for micropollutants treatment.
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高影响因子
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