APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Pei Li,Jinchuan Zhang,Reza Rezaee,Wei Dang,Xuan Tang,Haikuan Nie,Shijing Chen
The variation in pore water distribution within gas shale reservoirs has a significant effect on gas content, and thus on resource evaluation. However, the characteristics of water micro-distribution and its effects on pore parameters are still not well understood due to the mixed wettability of shale and the complexity of the pore structure . In this study, six lower Permian transitional shale samples from the southern North China Basin, humidified at four levels up to a relative humidity of 98%, were selected for moisture-equilibrated experiments and low-pressure N 2 gas adsorption measurements. The results indicate that the adsorbed moisture in transitional clay-rich shales can be divided into capillary condensation water in the micropores and monolayer–multilayer adsorbed water in the non-micropores. Moreover, thermal maturity (VR o ), total organic carbon , clay, and carbonate are positively correlated with the adsorbed moisture and micro-/mesopores, indicating that water in shales could be hosted in inorganic pores as well as in organic pores. Furthermore, the distribution of adsorbed moisture is mainly controlled by the VR o , component wettability (i.e., organic matter, clay, pyrite, and carbonate), and pore structure (micro-/mesopore distribution). In addition, a subtle adsorbed moisture may significantly reduce both the pore volume (PV) and specific surface area (SSA) of micropores, and the effect on micropores and SSA is more pronounced than that on the respective non-micropores and PVs. Additionally, the mechanism of clay swelling and pore expansion in clayey shale can provide certain insights for water–methane competitive adsorption, identifying clay type and pore size, and the formation of organo-mineral complexes.
研究领域:
地质学
·
能源科学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Jing-tao Li,Zhu-yu Li,Run Zhang,Li Zhao,Qi Niu,Ying-tao Dong,Ji-hong Li,Zhi-mo Fang,Qiang Lu,Kai Li
Spent bleaching clay (SBC) is a by-product of refining edible oil. The adsorbed oil in SBC can be recycled into aromatics via catalytic pyrolysis, whereas the solid product is a biological carbon-rich clay (PBC). In order to achieve the value-added utilization of PBC, an effective method was developed to prepare clay/carbon adsorbent (SBC/C–S) with high adsorption performance, and its adsorption capability was evaluated by adsorbing Pb(Ⅱ) from simulated Pb(Ⅱ)-contaminated wastewater. PBC was activated with sulfuric acid after pyrolysis to produce SBC/C–S, while the clay structure maintained the major mineral structure. The formed carbon layer primarily contributed to the microporous structure and active sites on surface, which was conducive to the efficient Pb(Ⅱ) adsorption. The adsorption thermodynamics and kinetics of SBC/C–S were studied via fitting different mathematical models, and the results matched well with pseudo-second order and Freundlich models. The adsorption mechanism of SBC/C–S might be electrostatic attraction or chemical complexation. The adsorption capacity of SBC/C–S reached 315.60 mg/g, much higher than that of fresh and H 2 SO 4 activated bleaching clays (69.03 and 295.28 mg/g). Therefore, SBC/C–S is a potential adsorbent with great reusability for Pb(Ⅱ) removal from industrial wastewater, which achieves the recycling and effective utilization of waste material.
研究领域:
环境科学
·
化学工程
·
材料科学
·
水污染控制
·
工业废弃物管理
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 21
·2400141
·
IF 2.5
Lan Li,Yanjun Ren,Rugang Yao,Hong Yang
To solve the downhole problems correlated with clay hydration swelling and dispersion under high-temperature conditions, a 1-aminoethyl-3-vinylimidazolium bromide ([NVim]Br) and a [NVim]Br/acrylamide copolymer (poly([NVim]Br-co-AM)) are synthesized and used as inhibitors. The molecular structures of [NVim]Br and poly([NVim]Br-co-AM) are characterized by FT-IR and 1 H-NMR. The inhibition properties of [NVim]Br and poly([NVim]Br-co-AM) are evaluated by free swelling and dispersion tests, linear swelling, hot roll recovery experiments and thermogravimetric analyses.The inhibition mechanisms were revealed by X-ray diffraction, zeta potential, wettability analysis and ESEM observation. The results showed that both [NVim]Br and poly([NVim]Br-co-AM) has significantly superior inhibition performance compared with the common inhibitors KCl, polyether amine D230 and polyquaternium-7. Both [NVim]Br and poly([NVim]Br-co-AM) can resist 250 °C. [NVim]Br performed excellently in inihibiting both crystalline and osmotic swelling, which depended on the strong electrostatic adsorption and hydrogen bonds of imidazole cations and primary amine in [NVim] + . Poly([NVim]Br-co-AM) exerted excellent inhibition by minimizing osmotic swelling, reducing hydrophilicity and increasing clay bonding. The results are important for understanding the rational design of novel efficient inhibitors for drilling high-temperature shale formation.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Xing Li,Ya Wen,Yulian Zhang,Zhiqiang Ge
Insect pheromone is a class of natural non-toxic and harmless biological pesticide. To improve the utilization efficiency of the pheromone pesticides, controlled release in response to circadian rhythm of insects is a feasible approach because some insects act and release pheromones with a circadian rhythm. Thus, myrcene, as the insect pheromone model, was first loaded into the hollow nano-cavity of halloysite nanotubes (Hal), which were further enclosed with melted n-octadecane as a coating to form a composite (PMHal). The latter was simply blended into chitosan solution to cast a chitosan composite film (PMHal@CS) for preventing n-octadecane leakage during the phase change process . The effects of temperature change on the release rate of myrcene from the composite film were evaluated. Results showed the combination of Hal with n-octadecane could significantly slow the release rate of myrcene from the composite film when the ambient temperature was below 15 °C. If the ambient temperature was near to the melting point of n-octadecane, the release rate of myrcene would be enhanced. In alternating temperature cycles test of PMHal@CS film, the average release rate of myrcene was 0.65 μg/h at 30 °C and 0.022 μg/h at 15 °C, the persistent temperature sensitivity and good temperature rhythm were still remained after 7 cycles. These results suggested that the composite film had a good controlled release effect on myrcene and could adapt well to the circadian rhythm activity of some insects.
研究领域:
农业科学
·
材料科学
·
昆虫学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 2
·903-911
·
IF 1.137
Wu Hao,Huang Wei,Duan Zhiqin,Luo Mingbiao,Wang Zhifen,Hua Rong
For the first time in laboratory, diffusion parameters of Se(IV) in the clay of Chinese Tamusu region(TMS clay) against compacted density, ionic strength and pH value were obtained by capillary method. Diffusion process can be Simplified by using one-dimensional semi-infinite medium diffusion model. The results show a good similarity with the international literature and meet the internationally recognized range of 10 −9 –10 −12 . This work will provide data support and theoretical references for the pre-selection of clay rock sites in China’s high-level radioactive waste deep geological repository.
研究领域:
环境科学
·
地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 10
·654
·
IF 4.432
Xiaowu Wang,Yang Wang,Mengtian Sun,Guichao Wang,Qiong Liu,Ming Li,Yury M. Shulga,Zhi Li
In this work, we reported that aramid pulps (AP) reinforced clay aerogel composites with improved mechanical strength, good thermal insulation and fire resistance based on the combination of AP, Poly(vinyl alcohol) (PVA) and sodium montmorillonite (MMT), which present a promising prospect in the thermal insulation application. The PVA-MMT-APx(x: denotes the mass content of AP) aerogel composites present an isotropic “lamella-honeycomb” porous structure, which endows them with excellent comprehensive performance. With the AP content increasing, the extremely low density is kept, ranging between 67–73 mg/cm3, and the low thermal conductivity is maintained within 40.9–47.9 mW·m−1·K−1. The mechanical strength is significantly improved with the maximum compressive modulus increasing from 2.95 to 5.96 MPa and the specific modulus rising from 44.03 to 81.64 MPa∙cm3/g. Their detailed heat transfer process has been analyzed, which provides a deep understanding to the low thermal conductivity of the PVA-MMT-APxaerogel composites. Based on the combination of thermogravimetric analysis and combustion behavior, the PVA-MMT-APxaerogel composites are demonstrated to possess improved thermal stability and fire resistance. This study puts forward a facile approach to utilizing AP to reinforce clay aerogel composites, which provides new insight into the development of thermal-insulating, fire-safe and high-strength thermal insulation materials.Keywords:aramid pulps;clay aerogel;mechanical properties;thermal properties;combustion behavior
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GEOCHIMICA ET COSMOCHIMICA ACTA
·
2009
·
IF 4.235
Sean A. Shaw,Derek Peak,M. Jim Hendry
Although widely investigated in relation to acid mine drainage systems at pH > 1.0, we know little about the impact of sulfuric acid (H 2 SO 4 ) on the geochemistry and mineralogy of clays at pH < 1.0 (including negative pH values). Thus, laboratory batch experiments were conducted on three mixed clay samples with different mass ratios of phyllosilicates (smectite, illite , and kaolinite) to investigate the impact of H 2 SO 4 from pH 1.0 to −3.0 for exposure periods of 14, 90, 180, and 365 days. Si and Al K- and L 2,3 -edge X-ray absorption near edge structure (XANES) spectroscopy were employed on these samples to determine the chemical and structural changes that occur during acidic dissolution of phyllosilicates that cannot be distinguished using X-ray diffraction analyses. A series of silicate, phyllosilicate, and Al-bearing standard compounds were also studied to provide an explanation for the observed changes in the clay samples. The Si XANES results indicated the preferential dissolution of the phyllosilicates (pH ⩽ 1.0, t ⩾ 14 d), the persistence of quartz even at pH ⩾ −3.0 and t ⩾ 365 d, and the formation of an amorphous silica-like phase that was confined to the surface layer of the altered clay samples at pH ⩽ 0.0 and t ⩾ 90 d). Al XANES results demonstrated dissolution of Al-octahedral layers (pH ⩽ 1.0, t ⩾ 14 d), the persistence of four-fold relative to six-fold coordinated Al, and the precipitation of an Al-SO 4 -rich phase (pH ⩽ −1.0, t ⩾ 90 d). An existing conceptual model of phyllosilicate dissolution under extremely acidic conditions was modified to include the results of this study.
研究领域:
地质化学
·
矿物学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2022
·Vol. 22
·期 4
·2100491
·
IF 5.859
Manshan Xie,Zhiwen Zheng,Shiheng Pu,Yong-Guang Jia,Lin Wang,Yunhua Chen
Developing nanocomposite hydrogel with multi-functions including adjustable mechanical property, tissue-adhesion, and blood coagulation property to accelerate wound healing is highly desirable in surgical application. Here a macroporous adhesive nano-enabled hydrogel constructed from gelatin methacryloyl stabilized air-in-water emulsions incorporated with dopamine-grafted-gelatin (GelDA) and Laponite nanoclay is reported. The hydrogel exhibits interconnected macroporous structure. The physical/chemical cross-linked network formed among the various components contributes to the good mechanical strength of hydrogel, which could be further regulated by adjusting the concentration of Laponite nanoclay. Furthermore, the nanocomposite macroporous hydrogel is endowed with self-healing properties and tissue adhesion by the intermolecular hydrogen bonds, ionic interactions among Laponite nanoclay and polymers, as well as the catechol functional groups. The in vitro studies demonstrate that the macroporous hydrogel has good biocompatibility and could significantly reduce blood clotting time, which is expected to be applied for the rapid sealing and hemostasis of bleeding wounds.
研究领域:
生物材料
·
医学工程
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
Bulletin of Engineering Geology and the Environment
·
2024
·Vol. 83
·期 9
·1-16
·
IF 3.7
Gao Yuhao,Li Jianzhong,Yang Zhongping,Li Xuyong,Wang Zhitao
The sanitary landfill method remains the primary disposal of municipal waste in developing countries. Effective landfill barriers in intercepting pollutants are warranted to avoid soil and groundwater contamination by leachate leakage from those landfills that threaten human health. This work focuses on enhancing the capability of reticulated red clay barriers to intercept Pb(II) by incorporating activated charcoal and bentonite. The impacts of additives on the hydraulic behavior and Pb(II) blocking efficacy of composite reticulated red clay were explored through hydraulic conductivity and leachate concentration tests, respectively. The microstructural evolution of barrier materials was revealed through scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) tests. Results suggest that the formulated activated charcoal-bentonite-reticulated red clay composite barrier exhibited significantly better performance than those with the additives individually. The permeability coefficient and Pb(II) leachate concentration of the activated charcoal-bentonite-reticulated red clay barrier with 5% activated charcoal, 16% bentonite, and 79% reticulated red clay were found to be 13.20% and 23.97% of pure reticulated red clay, respectively. The pore size distribution (PSD) curve indicates that the activated charcoal -bentonite-reticulated red clay barrier contains only nanoscale pores. In addition, the activated charcoal and bentonite in the composite barrier form a tortuous network structure that binds the clay aggregates together. This results in more intricate flow paths, enhancing adsorption and ion exchange effects, ultimately reducing hydraulic conductivity and improving the barrier’s ability to intercept contaminants.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2024
·
IF 2.8
Haitao Huang,Zhaomeng Xv,Yu Qiao,Yonghong Ge,Xiuxia Li,Qiuying Li,Tong Sun
In order to inhibit the growth and reproduction of microorganisms in the exudate of fresh aquatic products during storage. Absorbent paper, absorbent cotton and nylon mesh were used as the substrates, three types of clay minerals (diatomite, columnar diatomite and bentonite) were used as the water absorbing materials and a new type of unidirectional water-conducting preservation pads was prepared. The physicochemical properties of water absorbing materials and preservation properties of pads for Lateolabrax japonicas fillets were measured. The results show that all three kinds of clay have good water absorption properties, and bentonite exhibits the highest water retention properties because of metal oxide. After absorbing water, the surface holes of diatomite and columnar diatomite particles are blocked, while the volume of bentonite particles increases. Bentonite absorbs water slowly but retains water best and can absorb 10.31 times its own mass of water. Preservation study shows that water absorption preservation pads can effectively absorb the exudate of fish fillets and slow down the deterioration of fish fillet quality. Bentonite preservation pad shows the best effective and extends the shelf life of L. japonicas fillets from 6 to 9.3 days. This research can provide the technical support for the application of preservation pads carrying clay minerals in the field of fresh aquatic products.
研究领域:
食品科学
·
水产保鲜技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·149-158
·
IF 1.371
Sun Yuzhen,Zhang Hui,Lee Chuan-Pin,Luo Mingbiao,Hua Rong,Liu Weigang,Kong Jie,Hu Yanqin
For the first time in laboratory, the diffusion behavior of Se(IV) in Tamusu clayrock core was studied by means of through-diffusion method. The effects of pH, ionic strength and humic acid on the diffusion behavior of Se(IV) in clayrock were studied. The effective diffusion coefficient, distribution coefficient and rock capacity factor value were obtained. The diffusion mechanism of radionuclide in Tamusu clayrock is discussed, which can provide experimental data support and theoretical references for the pre-selection of clayrock sites and safety assessment in China’s high-level radioactive waste deep geological repository.
研究领域:
放射生物学
·
地质学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yanan Wei,Yunlei Zhang
A novel halloysite (Hal) based acidic catalyst was synthesized by anchoring functional alkyl group and Cr site and catalyzed the selective conversion of mannose to 5-hydroxymethylfurfural (HMF) in NaCl-H 2 O/dimethyl sulfoxide/methyl isobutyl ketone (MIBK) biphasic system. Herein, adjusting the hydrophilicity/hydrophobicity of catalyst by modifying the octyl group can facilitate the HMF yield. The density functional theory (DFT) calculation and in-situ FT-IR results revealed that increasing the hydrophobicity of catalyst surface weakened the interaction between HMF, water molecule and acid sites and inhibited the rehydration of HMF. Moreover, the synergistic effect between Cr and sulfonic group active sites remarkedly promoted the isomerization of mannose to fructose and the dehydration of fructose to HMF, and the 48.1% yield of HMF was obtained. This study provides references for the high value conversion of hemicellulose with the high efficiency reaction system.
研究领域:
生物化学
·
催化化学
✓ 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）