COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhang Wen,Bo Zhang,Wanhui Gong,Kai Wang,Bin Liu,Wensheng Ning,Wanjin Yu
La doped silica aerogel composites (La 2 O 3 /SiO 2 -n) with different Si/La molar ratio were synthesized through sol-gel method and atmospheric drying technology, which were used to adsorb thiophenic compounds from model fuels. Compared with the pure SiO 2 aerogel, the adsorption capacities of La 2 O 3 /SiO 2 -n obviously increased, owing to adding La species led to the appearance of the weak Lewis acid sites on the surface. The adsorption mechanism of La 2 O 3 /SiO 2 -n for thiophenics included the direct S-La bond and weak π-La acid-base interaction between La 3+ and thiophenics, and the former was primary. Among La 2 O 3 /SiO 2 -n, the La 2 O 3 /SiO 2 -200 not only had the highest adsorption capacity for thiophene, up to 8.16 mg S/g ads (i.e., 138.31 mg-S/mmol La), but also exhibited an excellent anti-aromatics competitive adsorption ability and a good regeneration performance. The adsorption kinetic and adsorption isotherms were well described by pseudo-second-order (PSO) and Langmuir models, respectively, indicating the adsorption of La 2 O 3 /SiO 2 -200 for TH was dominated by chemisorption, which was a spontaneous and endothermic process. The present of aromatics in model fuels had a slightly negative effect on the adsorption of La 2 O 3 /SiO 2 for thiophene.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ye Yuan,Fei Shi,Qinghua Li,Yi Yang,Xiangyu Cai,Menglong Sheng,Zhi Wang
The increasingly serious situation of CO 2 emissions compels researchers to pay extensive attention to industrial processes for carbon capture. Membrane-based separation technology is widely regarded as a promising reserve method for carbon capture, featuring a wide adjustment range, flexible operation and modular design. In this work, a large-scale interfacial polymerization membrane production process for carbon capture was developed together with the construction of novel interfacial polymerization equipment with an adjustable organic phase bath and surface cross-linking unit. A monomer suitable for efficiently preparing high-performance CO 2 separation membranes was selected through a combination of experiments and simulations. The effect of production conditions on the structure and performance of large-scale membranes was investigated. The performance resilience at high pressure and short-term stability in the presence of impurities of the optimized membranes were examined. Techno-economic evaluation targeting carbon capture from post-combustion gas verifies the significant industrial application potential of the membranes.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Xingyu Lin,Ruoxin Zhang,Yingjiang Chen,Xiaoxia Zheng,Jian Lan,Yang Wu,Li Wang,Hongsheng Lu
To achieve the green, sustainable, and controllable recovery of oil–water resources and to address the limited functionality of single superwet materials in oil–water separation, this study reports a multifunctional oil–water separation strategy by compositing the underwater superoleophobic and underoil superhydrophobic materials (HS). The underwater superoleophobic quartz sands with an oil contact angle of 152.68° were prepared by adjusting the particle size. This material demonstrated a water flux of 4688 L m–2 h–1 and a low-density oil and water mixture separation efficiency of 98.6%, which remained above 97.9% over 50 cycles. It was effective in separating oil-in-water emulsions with a separation efficiency of >99%. For HS, quartz sands were modified with dodecyltrimethoxysilane. The optimized HS-4 exhibited superhydrophobic properties with a water contact angle of 157.06°. It achieved an oil flux of 5775 L m–2 h–1 and a water and dichloromethane mixture separation efficiency of 98.4%. Additionally, they exhibited significant potential in the separation of water-in-oil emulsions. Furthermore, by placing the underwater superoleophobic and underoil superhydrophobic units at the bottom of the filter, we achieved cyclic separation of high-density oil and water mixtures, low-density oil and water mixtures, water-in-oil emulsions, and oil-in-water emulsions. The separation efficiency consistently exceeded 96.5% over 10 cycles. In addition, the oil–water separation mechanism of underwater oleophobic and underoil hydrophobic materials was demonstrated by the relative concentration distribution of water and oil with molecular dynamics simulations. This intelligent oil–water separation method marks a significant advancement in the sustainable separation of diverse oil–water mixtures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 8
·2407957
·
IF 12.1
Wei Sheng,Jianxin Zhou,Yuxi Jia,Wentao Li,Ruixi Qiao,Zixi Liu,Wenjie Xu,Tao Zhang
Stretchable hydrogel devices are highly desirable for their capacity to seamlessly integrate significant stretchability, high conductivity, and exceptional biocompatibility. Nonetheless, the substantial disparity in stiffness between soft hydrogels and commonly rigid electrode materials often leads to pronounced performance fluctuations or even complete failure of sensor circuits in practical applications. Here, the study introduces an intrinsically stretchable graphene-hydrogel strain sensor (GHSS) fabricated by integrating a hydrogel and a 3D graphene foam with very closely matched elastic moduli. The GHSS demonstrates a strain detection limit of 0.02%, a rapid response time of 64 ms, and long-term stability, enabling the detection of human joint movements, physiological signals, touch pad input, and exercise monitoring.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Zhonghua Xue,Yali Feng,Haoran Li
Investigating the reverse flotation desilication process of magnesite tailings (MT) holds substantial merit in the context of magnesium metal recovery from solid waste. However, scant attention has been devoted to exploring the influence of the carbon chain length of diverse alkanes on the reverse flocfloatation desilication of MT. This research systematically delved into the selective adsorption behavior exhibited by dodecylamine (DDA) and its compound collectors on the surfaces of quartz and magnesite. As the carbon chain length of alkanes increases, the efficacy of reverse flotation desilication of MT diminishes. Under optimized conditions, the concentration of MgO in the concentrate registers a 0.93% increment, accompanied by a 2.05% reduction in SiO 2 content. The optimal MgO grade attains 42.68%. The augmenting carbon chain length of alkanes leads to a decline in the dispersibility of the compound collector and a reduction in the diffusion coefficient of the monolayer film at the alkane/water interface. The compound collector, comprising n-heptane and DDA, manifests a noteworthy synergistic promotion effect on the flotation desilication of MT. This effect reduces the multilayer adsorption of DDA, promotes more hydrogen bonding formation, and favors DDA adsorption on the quartz surface over magnesite. Consequently, issues related to froth entrapment and poor selectivity are alleviated. Longer alkane chains in the compound collectors result in a stronger van der Waals force effect between the carbon chains. This effect causes DDDA to slide more easily on the quartz surface, which is not conducive to enhancing the hydrophobicity of the surface. Furthermore, alkane-induced hydrophobic flocculation increases the floccules size of quartz, enhancing the likelihood of bubble-particle adhesion. This investigation elucidates the molecular-level mechanism underlying alkane hydrophobic flocculation with varying chain lengths, contributing a theoretical foundation and technical support for the large-scale MT management and the sustainable production of magnesium metal.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Xiaoning Zhang,Buning Chen,Jianwei Wang,Yusheng Zhou,Xueli Huang,He Huang
Background Molybdenum disulfide is one of the main catalysts used in slurry-bed reactors. However, monolayer molybdenum disulfide with high hydrogenation activity is extremely difficult to obtain owing to the van der Waals forces between layers. Methods MoTi-X catalysts with different MoS 2 loadings were synthesized using a hydrothermal method. Changes in the active phase of MoTi-X during hydrogenation were also analyzed by TEM, XPS, and Raman spectroscopy. Significant findings MoTi-X catalysts synthesized by a two-step hydrothermal process allowed for the simultaneous generation of monolayer MoS 2 and hydrogenation. The results of the phenanthrene-phenol co-hydrogenation system showed that the different active sites on MoS 2 were responsible for its Hydrogenation and Hydrodeoxygenation properties. Using MoTi-X to catalyze coal tar (CT) hydrogenation, the total content of gasoline and diesel fractions was increased by 11.3 %, which is 3.3 times more effective than industrial four-stage hydrogenation. The average molecular mass, viscosity, and density of the coal tar were reduced by 35 %, 96 %, and 6 %, respectively. The application of MoTi-X catalysts for CT hydrogenation can fill the gap in the research on CT slurry-bed hydrogenation catalysts and improve the competitiveness of enterprises.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yuehua Xiao,Chengtao Wang,Jiale Xiao,Hangjie Li,Zhengxing Cui,Yeqing Wang,Liang Wang,Feng-Shou Xiao
Oligomerization of alkenes is a promising way for production of high-quality and eco-friendly liquid fuels, where zeolite catalysts are critical. In the zeolite catalysts, mass transfer and accessibility in the reaction are normally influenced by intrinsic micropores of zeolites, in particular, bulky or branched molecules are employed. Here, we report isoamylene (2-methyl-2-butene) dimerization over mesoporous HY zeolites obtained by facile NaOH treatments. These mesoporous HY zeolites exhibited high activity and good stability for the isoamylene dimerization compared with untreated HY zeolite. Powder XRD patterns, N2 physisorption, SEM, TEM, NMR, FTIR, and NH3-TPD techniques were used to characterize the porosity and acidity of the zeolites. These results showed that mass transfer and accessibility to the acid sites of the guest molecules are the key factors for the improvement of catalytic performances.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Jiaxin Li,Yi Guo,Jienan Li,Hua Zhang,Li Wang,Changhai Liang
5-cyanopentanamide (5-CVAM) is an important intermediate for fine chemicals and pesticides. Previously, our group found a novel nitrile hydratase (ReNhase) that can convert adiponitrile (ADN) into 5-CVAM. Nevertheless, the poor tolerance of recombinant Escherichia coli (E. coli) strain has caused limitations in industrial applications. Herein, the tolerance of recombinant E. coli cells expressing ReNhase was explored by combining the IrrE gene, which is a representative global regulator derived from Deinococcus radiodurans . Results show that the tolerance of the modified strains was improved significantly with organic solvent. ReNhase TAC strain and ReNhase AmpRp strain were 2.8 times and 2.3 times higher than that of ReNhase WT strain in the yield of 5-CVAM. Meanwhile, the modified strains have outstanding performance in acid-base tolerance, thermal stability and tolerance in high salt solution. It is also found that the modified strains had smaller changes in mitochondrial membrane potential under the pressure environments described above. In terms of cell surface hydrophobicity, the modified strains had lower adsorption rates for organic solvents, which further confirmed the excellent tolerance of modified strains. The findings will provide a new theoretical basis for the modification of recombinant E. coli for improving the catalytic efficiency of adiponitrile in industrial production.
✓ 已验证
产品关联
DOI
高影响因子
PETROLEUM CHEMISTRY
·
2024
·Vol. 64
·期 3
·346-356
·
IF 1.3
Wei Shengchao,Lu Dan,Yao Zhilin,Zhu Lijun,Yin Changlong,Xia Daohong
Abstract In order to understand the structure of asphaltene after its disaggregating by chemical processing, a comprehensive study for exploring the structural changes of asphaltene after acylation as a case of chemical processing was conducted. Functional groups, crystal parameters, hydrogen types, and micromorphology of acylated asphaltenes were analyzed by FT-IR, XPS, XRD, 1 H NMR, SEM and IFM (inverted fluorescence microscope) methods. Additionally, fluorescence spectroscopy methods were performed to analyze the effect of acylation on the aggregation ability of asphaltene. Experimental results indicated that the C=O double bond was enhanced and the content of O–C=O was increased on the surface of acylated asphaltene. The number of stacking layers and the aggregate size of asphaltene decreased obviously after acylation. Fluorescence spectral analysis showed that the critical aggregation concentration of acylated asphaltenes increased compared to the raw asphaltenes. These results indicate that acylation reaction can disaggregate asphaltenes and hinder their re-aggregation in a solution. The disaggregation effect of asphaltene acylation can be attributed to the weakening of a hydrogen bonding and enhancement of a steric hindrance in the asphaltene molecule. This study provided the further understanding of the structural changes of asphaltene after the chemical treatment.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuewen Shao,Chengsen Song,Mengjiao Fan,Kai Sun,Guoming Gao,Chao Li,Lijun Zhang,Shu Zhang,Tao Wei,Xun Hu
Recycling waste polycarbonate (PC) plastic via hydrogenolysis and hydrogenation to specific chemicals, such as bisphenol A, 4,4′-isopropylidenedicyclohexanol, and propane-2,2-diyldicyclohexane, is challenging, as balancing the activity of Ni-based and Co-based catalysts for hydrogenation and deoxygenation is required. In this study, various Ni-based and Co-based catalysts were synthesized via alloying metallic sites and tailoring acidity/basicity of the catalytic systems for achieving selective conversion of PC plastic to valuable chemicals. The results indicated that alloying Ni and Co with Sn formed Ni-Sn and Co-Sn alloys with larger crystallize size, created abundant Lewis acid sites and generated electron-rich Ni species, which suppressed the ring-saturation in bisphenol A and achieved selective conversion of PC to bisphenol A (yields: 93.3% over Ni-Sn-Al and 97.4% over Co-Sn-Al) in 1,4-dioxane. However, introducing alkaline MgO as the carrier in Ni-Mg and Co-Mg catalysts enhanced the distribution of hydrogenation sites but reduced the availability of acidic sites, thereby lowering the removal rate of C-OH bond in 4,4′-isopropylidenedicyclohexanol. H-ZSM-5, an acidic co-catalyst with abundant Brønsted and Lewis acid sites, was further introduced to work in tandem with metallic sites in Ni-Al/H-ZSM-5. The strong Lewis acidic sites in H-ZSM-5, with high affinity for both the benzene ring and C-OH bond, significantly enhanced the catalytic activity and stability of Ni-Al/H-ZSM-5 in n -heptane, showcasing superior activity for producing propane-2,2-diyldicyclohexane with yields of 92.0 and 92.9% from PC powder and DVD disk over Ni-Al/H-ZSM-5.
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2024
·
IF 6
Xin-Yuan Li,Xu-Biao Zhang,Si-Bei Li,Li-Wei Hui,Xin-Jie Sun,Jun Xu
The gelation of crude oil with high wax and asphaltene content at low temperatures often results in the block of transportation pipeline in Africa. In recent years, it was reported that surface hydrophobic-modified nanoparticles have important applications in crude oil flow modification. In this work, four kinds of core-shell hybride nanoparticles by grafting poly (octadecyl, docosyl acrylate) and poly (acrylate-α-olefin) onto the surface of nano-sized SiO 2 were synthesized by grafting polymerization method. The chemical structure of nanoparticles was analyzed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The rheological behaviors of crude oil and precipitation of asphaltenes in the presence of nanoparticles were studied by measuring the viscose-temperature relationship curve, the cumulative wax precipitation amount, and morphology of waxes and asphaltenes. The results indicate that the docosyl polyacrylate@SiO 2 nanoparticle (PDA@SiO 2 ) can reduce the cumulative wax precipitation amount of crude oil by 72.8%, decline the viscosity of crude oil by 85.6% at 20 °C, reduce the average size of wax crystals by 89.7%, and inhibit the agglomeration of asphaltene by 74.8%. Therefore, the nanoparticles not only adjust the crystalline behaviors of waxes, but also inhibit the agglomeration of asphaltenes. Apparently, core-shell hybride nanoparticles provides more heterogeneous nucleation sites for the crystallization of wax molecules, thus inhibiting the formation of three-dimensional network structure. The core-shell polymer@SiO 2 hybride nanoparticles are one of promising additives for inhibiting crystallization of waxes and agglomeration of asphaltenes in crude oil.
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC GEOCHEMISTRY
·
2024
·
IF 2.6
Wenna Liu,Wanglu Jia,Qiang Wang,Jian Chen,Jinbu Li,Ping’an Peng
The isotopic fractionation of organic compounds during evaporation is one of the most critical issues in the field of stable isotopes. The hydrogen (H) isotopic compositions of light hydrocarbons (LHs) in oil have gained increasing interest in the research of oil genesis in recent years. However, compared to carbon (C) isotopes, our understanding of H isotopic fractionation patterns and influences for various types of LHs during evaporation is limited. In this study, we performed evaporation experiments at a constant temperature on LHs in three systems: single compound, alkane mixture, and light oil. We assessed the contents and H isotopic compositions of individual LHs in the residual liquid phase. The degree of H isotopic fractionation and influencing factors are studied combined with C isotopes. The H isotopic fractionation of LHs exhibits “inverse isotope fractionation” characteristics (a depletion in D in the residual LHs) with progressive evaporation, which is opposite to the C isotopic fractionation. The degree of isotopic fractionation is influenced by the evaporation system, the compounds’ molecular weight, and their structure. (1) The isotopic fractionation degree of H and C decreases in the following order: light oil > alkane mixture > single compound system. This difference may be related to the unsaturation level of the evaporative system and the evaporation matrix. (2) For LHs with the similar structure in the same evaporation system, the degree of H isotopic fractionation increases with increasing molecular weight due to the buffering effect of the sample pool, while the magnitude of C isotopic fractionation decreases. (3) For LHs with the same C number, methylcyclohexane (MCH) has a lower evaporation rate and less isotopic fractionation than the other C 7 compounds like 3-methylhexane (3-MH), n -heptane ( n C 7 ), and toluene (Tol). The distinctive fractionation characteristics of H isotopes make them very useful in geological applications. Combining H and C isotopic compositions of the same compound with the commonly used molecular ratios of LHs (e.g., n C 7 /MCH, Tol/ n C 7 ) enables full differentiation of three critical processes controlling oil formation: evaporation, thermal maturation, and biodegradation. Furthermore, the differences in H isotopic compositions between C 7 LHs (3-MH, n C 7 , and Tol) may be changed by evaporation, but the variation range is much smaller than that caused by source differences. Therefore, combining H and C isotopes may have great potential for oil source characterizations.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）