COMBUSTION AND FLAME
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2021
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IF 4.185
Zhi-Hao Jin,Jin-Tao Chen,Wang Li,Shu-Bao Song,Jiu-Zhong Yang,Zhen-Yu Tian
Owing to significant advantages over traditional biofuels, 2-methylfuran (MF) has arisen extensive interest as next generation biofuels . Atmospheric pressure pyrolysis of a 1:1 blend of MF with a three-component (3C) surrogate jet fuel was conducted in a flow tube using synchrotronphotoionization and molecular beam mass spectrometry techniques within a temperature range of 898–1223 K. Therein, the 3C surrogate fuel consists of 66.2% n-dodecane (NC 12 H 26 ), 18.0% 1,3,5-trimethylcyclohexane (T135MCH) and 15.8% n-propylbenzene (NPB, A1C 3 H 7 ). The detailed kinetic model including 579 species and 3474 reactions was developed via validating against both measured and literature data with reasonable agreement. MF exhibits no obvious influence on the 3C components pyrolysis . However, 3C mixtures play an important roles in MF decomposition: lower initial temperature and different decomposition pathways. In the meantime, n-propylbenzene (NPB) pyrolysis curve in 3C and 3C+MF significantly transfers to low temperature zone after 1000 K in contrast to pure NPB, while smaller change was found in the decomposition curve of n-dodecane. Compared with 3C pyrolysis, 3C+MF blends have less formation of aromatic species and light hydrocarbons except for vinylacetylene (C 4 H 4 ) and acetylene (C 2 H 2 ). Allyl radical (C 3 H 3 ) has significant roles in benzene ring formation. The combination of allyl radical with propargyl radical producing benzene and H radical (aC 3 H 5 + C 3 H 3 = A1 + 2H) has the highest contribution to the benzene formation in both 3C and 3C+MF. Moreover, most of naphthalene (A2) formation is also related to C 3 H 3 radical via reaction: A1CH 2 + C 3 H 3 = A2 + H, rather than via HACA (hydrogen abstraction carbon addition) reaction. Interaction of fuel blends was mainly presented through the common and important sensitive reactions which are much to do with CH 3 and H radicals. The overview of product distribution was investigated by providing comparisons of carbon conversion rates during the pyrolysis of 3C and 3C+MF. These results will be helpful to better understand the pyrolysis properties of MF/jet fuel surrogate blends and could contribute to developing new generation biofuels for aviation.
研究领域:
燃料化学
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燃烧动力学
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生物燃料
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能源化学
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反应机理
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质谱分析
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Qing-Ming Wang,Jin-Chang Lin,Zhen-Hui Liu,Qiu-Feng Lü
Ti 3 C 2 T x -based modified separation materials are widely used in the field of wastewater separation, but most of them have poor fluxes. Here, grafting of l -cysteine and l -histidine onto polydopamine-pretreated Ti 3 C 2 T x surface was used to obtain amino acid-modified Ti 3 C 2 T x (L-CPT and L-HPT), respectively, by covalent and non-covalent bonds under mild conditions, enriching variety and number of hydrophilic groups on the Ti 3 C 2 T x surface. Polyurethane sponge (PU) coated with L-CPT and L-HPT (L-CPTPU and L-HPTPU) exhibit excellent underwater oleophobicity and show impressive separation efficiency (>99.4%) for various oil-water mixtures. Especially, L-CPTPU and L-HPTPU achieved high-throughput separation for cyclohexane-water mixtures with maximum permeation fluxes of 220,319 and 222,197 L m -2 h -1 , respectively, and had excellent resistance to corrosive media. Besides, polyamide membranes modified with L-CPT and L-HPT (L-CPTPA and L-HPTPA) form abundant permeation channels, achieving high-efficiency separation for toluene in water emulsion with separation efficiency greater than 99.1%. In addition, L-CPTPA and L-HPTPA exhibited remarkable rejection (>99.1%) and high permeability (>1100 L m -2 h -1 bar -1 ) for 20 mg L -1 malachite green solution. Therefore, the amino acid-modified Ti 3 C 2 T x can functionally modify PU and PA substrates toseparate oily wastewater and dye wastewater, respectively.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Hao Ling,Lei Wang,Qixuan Lin,Quanbo Huang,Xiaoqian Zhang,Junli Ren,Ning Li,Cheng Zhou,Zhiwei Lin,Jingpeng Zhou,Wenguang Wei,Xiaohui Wang
Separating films with both high efficiency and large flux are desperately needed to meet the rising demand for the treatment of oily wastewater, while traditional oil/water separation papers with high separation efficiency usually suffered from low flux due to the unsuitable size of filtration pores. Herein, we report a bio-based porous, superhydrophobic , and antimicrobial hybrid cellulose paper with tunable porous structures for high flux oil/water separation. The size of pores in the hybrid paper can be tuned by both physical supports provided by the chitosan fibers and the chemical shielding supplied by the hydrophobic modification. The hybrid paper with increased porosity (20.73 μm; 35.15 %) and excellent antibacterial properties can efficiently separate a wide range of oil/water mixtures, solely by gravity, with outstanding flux (maximum of 23,692.69 L m −2 h −1 ), tiny oil interception, and high efficiency of over 99 %. This work provides new sights in the development of durable and low-cost functional papers for rapid and efficient oil/water separation.
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 18
·e53797
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IF 3
Jin Qu,Xinru Ma,Guohao Miao,Yu Yang,Junping Zheng,Xiaofei Liu
Polyacrylamide nanospheres are widely used as recovery-enhancing polymers in low-permeability oil fields. However, with the further exploitation of oil fields in recent years, the performance of the regulating drive system has been put forward to higher requirements, so this study of the structure and oil displacement performance of the oil-based supramolecular system based on polyacrylamide, and further discusses its oil displacement mechanism. The results show that the viscosity value of the oil-based supramolecular system increases significantly, which can effectively improve the mobility ratio and improve swept volume. The ability of the system to remove crude oil from the slides is significantly increased, and the mathematical relationships are discussed. The oil displacement efficiency of the oil-based supramolecular system in different dispersion media was explored in combination with microchannels of a nonhomogeneous multistage bifurcation structure. This work supports the practical application of oil-based supramolecular nanospheres in oil fields.
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APPLIED CLAY SCIENCE
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2023
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IF 5.6
Jingfeng He,Xin Zhang,Qiang Bai,Shibo Huang,Hao Chen,Chengjing Guo,Lingtao Zhu,Bin Yang
As a vital non-metallic mineral resource , cleaning and purification of coal-series kaolin is of importance for the following processing and utilization. This research focused on surface modification to enhance the decarbonization performance of coal-series kaolin by triboelectric separation. The effect of citric acid or kerosene on the surface modification and charging performance of kaolinite and coal was explored through Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and charge-to-mass ratio measurements. The results indicated that owing to the adsorption of citric acid or kerosene, the decreased O content and the increased C content of coal enhanced the positive charge on the coal surface, while the decreased Al and Si content of kaolinite improved the negative charge on the kaolinite surface, which enlarged the charge-to-mass ratio gap between coal and kaolinite. Meanwhile, citric acid improved the charging performance of kaolinite and coal more significantly than kerosene. Furthermore, the influence of plate voltage, feeding speed, and friction wheel rotating velocity on the decarbonization performance of coal-series kaolin after surface modification was studied by triboelectric separation. The separation results indicated that surface modification with citric acid or kerosene improved the triboelectric separation efficiency of coal-series kaolin, and citric acid could realize the more effective separation of coal-series kaolin than kerosene. For 0.125–0.25 mm, 0.074–0.125 mm, and −0.074 mm coal-series kaolin, with citric acid modification, the valuable component recovery was 81.91%, 82.21%, and 82.83%, respectively, and the decarbonization efficiency was 44.66% (increased by 6.56%), 47.19% (increased by 7.00%), and 14.88% (increased by 2.53%), respectively. Our study provides vital guidance for enrichment and purification of coal-series kaolin resource via triboelectric separation.
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SOLVENT EXTRACTION AND ION EXCHANGE
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2023
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IF 2
Lili Cui,Jungang Cao,Shihui Jiao,Guangsheng Pang,Zhonglin Wei
A selective extraction process for recovering vanadium (IV) over chromium was proposed with use of a mixed extractant consisting of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP). The influence of various factors, which included the initial aqueous pH value, the concentration of leach solution and D2EHPA, phase ratio (O/A), extraction equilibrium time and extraction temperature in the extraction process on the separation of V and Cr was investigated. Under the condition of the optimum extraction, vanadium extraction was above 94.0%. Meanwhile, under the optimum stripping conditions, the vanadium stripping was above 93.0% utilizing 1.5 mol/L sulfuric acid as the effective stripping reagent. The regeneration and reusability of the loaded organic phases after stripping were discussed. In addition, continuous three-stage extraction and stripping strategy indicated that the aggregate loss of vanadium was 0.885% and that the purity of vanadium was more than 99.9%. Under the condition of the optimum precipitation, when the pH value of the stripping solution was adjusted to 7.0 with ammonia water, the precipitation efficiency reached 99.93%. The calcination conditions (above 680 °C in air) were finally determined by TG-DTA and TG-MS experiments, and the V2O5 obtained by calcination was characterized by XRD. Additionally, a method for detecting impurity elements in vanadium matrix without interference was established. The recovery technology has practical significance in enlarging production scale, reducing specific energy consumption and cost, and realizing automatic control in vanadium leaching process.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Guangzheng Wang,Jiaona Hou,Kai Yu,He Xu
The disposal of mobile phone print circuit boards (WMPCBs) has now been a problem because of the continually increasing production of mobile phones. It could be considered a new source of precious metal but may jeopardize the environment and human health without proper management. An emulsion liquid membrane (ELM) method is applied and improved to recover silver from WMPCBs and prepare AgNPs . The effects of significant operating parameters were studied for a better understanding of the ELM process. Under the optimized conditions i.e., 0.25 % (v/v) Cyanex 302, 6 % (v/v) Span 80, 5 % (w/v) ASC , 3500 rpm emulsification speed, 10 min emulsification time, 300 rpm extraction stirring speed, 10 min extraction stirring time and 3 (v/v) phase ratio, 98.7 % silver was extracted. AgNPs produced were flower structures assembled by a group of individual nanosheets with a diameter of 800–1400 nm and a thickness of 10–14 nm. The purity was 98.7 % and the yield was 96.6 %. AgNPs of oblate spheroidal structure with a diameter of 30–50 nm could be synthesized by controlling the concentration of Span 80 in ELM. The current study intends to fulfill the gap by exploring the recovery of silver from WMPCBs by the ELM method.
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 21
·e53875
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IF 3
Lei Li,Rui Chen,Fengyu Wen,Yashu He,Lin Cheng,Jierun Ma,Jianxin Mu
Oily wastewater has caused serious damage to the human health and ecological environment. It is urgent to develop novel materials for high performance oil/water separation. Porous melamine sponges (MS) are considered as an ideal matrix material for oil/water separation. Herein, molybdenum sulfide (MoS 2 ) modified with tannic acid (TA) and octadecylamine (ODA) was attached to MS framework via a facile dip-coating method. This novel and eco-friendly MS@(MoS 2 @ODA) sponge displays superior superhydrophobicity (WCA = 156.2°) and oil/water separation ability (absorption capacity = 113–145 g g −1 ). MoS 2 @ODA not only enhances surface roughness of MS framework, but also raises its specific surface area, causing an increase in the oil adsorption capacity of MS. Moreover, the composite sponge exhibited excellent chemical and mechanical stability. It is envisioned that this work can demonstrate a facile synthesis strategy for producing environmental friendliness MS with stable superhydrophobicity for high-efficient oil/water separation.
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DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
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IF 4.5
Jun-lian WANG,Lu LIU,Guo-dong XU,Pei-long WANG,Guo-yong HUANG,Feng-shan YU
To seek more efficient extractant for Pd recovery from leaching solution of spent automotive catalysts, a new compound N-methyl-N-isopropyl octanthioamide (TA-813) was synthesized and characterized through FT-IR, 1 H NMR, ESI-MS and elemental analysis. Its extraction and stripping behaviors for Pd were studied. To evaluate its reusability performance, extraction−stripping cycles were carried out. Finally, TA-813 was applied to separating Pd from simulated leaching solution of spent automotive catalysts. TA-813 shows fast extraction kinetics, high extraction efficiency and specific selectivity for Pd. During extraction two TA-813 molecules coordinate with one Pd. The loaded Pd in the organic phase is efficiently stripped by neutral and acidic thiourea solutions. TA-813 shows no loss in activity after eight extraction−stripping cycles. Even from simulated leaching solution of spent automotive catalysts, in which the concentrations of some purities (La, Ce, Mg, Al) are much higher than that of Pd, Pd is still selectively extracted.
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高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Guangcun Qian,Deliang Zhu,Jiangnan Li,Yu Li,Hongyan Tang
In practical applications, Nanofiltration (NF) membranes are confronted with inevitable challenges, including the terrible fouling and the deterioration by chlorine, which hinders the wider application. In this study, 2-aminophenol-4-sulfonamide (APSA) was incorporated to form the polyamide-sulfonamide active layer, thus highly stable antifouling NF membranes with chlorine resistance were fabricated. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results showed APSA successfully grafted on the membrane surface. Scanning electron microscope (SEM) and atomic force microscope (AFM) images indicated a smooth membrane surface. Water contact angle of the PA-SA NF membranes declined to 19.7° compared with the PA NF membranes. Flux recovery rates (FRR) of bovine albumin (BSA), humic acid (HA), sodium alginate (SA) and oil/water emulsion were 96.4%, 96.8%, 96.0% and 94.6%, respectively. Besides, slight decline occurred to FRR value for BSA after three fouling cycles. No obvious decline of the rejection and water flux was observed on long-term stability. Notably, slight rejection rate decline and no obvious FRR value decline were observed after chlorination. Overall, the PA-SA NF membranes possessed highly stable antifouling property and chlorine resistance. It might be due to the fact that APSA including various hydrophilic groups grafted onto the active layer. N–H bonds of sulfonamide could act as a sacrificial unit against free chlorine. It is anticipated that this work could provide a facile strategy to develop NF membranes with highly stable antifouling property and chlorine resistance.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Jingya Zhang,Feng Zhang,Wangxi Fang,Jian Jin
Membranes with super-wetting surface work well at separating oil-water mixtures, but efficient and continuous separation of surfactant-stabilized oil-in-water emulsion is difficult to achieve due to widely spread oil droplet size and stable droplet nature. This work reported a mixed-dimensional heterostructured oil-water separation membrane with electrospun hydrophobic polydimethylsiloxane/polyvinylidene fluoride (PDMS/PVDF) nanofibers on top of a hydrophilic polyaniline (PANI) coated microfiltration membrane support. It is discovered that small oil droplets are captured and coalesced by the hydrophobic-oleophilic PDMS/PVDF nanofibers, while water passes through the membrane from uncovered hydrophilic PANI micro-regions. Precise regulation on the proportion of hydrophilic and hydrophobic regions is achieved by controlling the electrospinning conditions, and highly efficient oil-in-water emulsion separation is thus accomplished with membrane pore size much larger than emulsified oil droplets. Multi-cycled and long-term crossflow separation experiments result in relatively stable membrane flux and oil-water separation efficiency higher than 99%, as coalesced larger oil droplets are continuously removed from the membrane surface by shear flow. Such heterostructured membranes with highly tunable wettability could therefore combine the merit of good separation efficiency and operation stability for practical surfactant-stabilized oil-in-water emulsion separation.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Canyu Cui,Wenwen Wang,Xinyan Lv,Shihui Jiao,Guangsheng Pang
The cobalt carbonate hydroxide one-dimensional (1D) needle-like nanostructure is grown on the non-woven fabric via hydrothermal method . The 1D interlaced needle-like structure not only reduces the pore size of the non-woven fabric but also provides rough micro-nano structure of the superhydrophilic cobalt carbonate hydroxide/non-woven fabric, which is endowed with superhydrophobicity by coating with polydimethylsiloxane (PDMS). The resulting superwetting non-woven fabrics exhibit high separation efficiency for a series of surfactant-stabilized organic solvent/water emulsions (more than 99.3% for both W/O and O/W emulsions) and preferable recyclability (more than 10 cycles). The fluxes for all W/O and O/W emulsions are above 300 L m −2 h −1 . Meanwhile the superhydrophobic fabric exhibits outstanding chemical stability in acid, alkaline and salt solution, and good mechanical durability after abrasion test with sandpaper. The comprehensive performances of the superwetting fabrics based on 1D nanostructure make them possible to be promising material for the separation of organic solvent/water mixtures in polluted water in harsh environments.
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高影响因子
危险品化学品经营许可证（带存储）