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
LANGMUIR
·
2025
·
IF 3.9
Fei Wang,Mengqi Liu,Peng Zhang,Yifan Xu,Daiming Liu,Guodong Zhang
Although methane-dense storage is anticipated in wet nanoporous materials using the synergy of adsorption and hydration (the so-called adsorption–hydration natural gas, AHNG), the understanding of this technology is still insufficient, which limits its large-scale application. Here, new insights into the AHNG technology are presented, including new findings, phenomena, problems, and solutions, which are helpful to improve the understanding of this technology, enhance methane storage density, and pave the way for its application. Both synergy and antagonism between adsorption and hydration were observed; the synergy increases methane storage capacity, while the antagonism weakens the adsorption and hydration efficiency. In addition, two special phenomena were discussed, which have never been noticed by the hydrate community, and artificial intelligence was thought to provide an effective method for material design, while a storage cell was suggested to improve inner mass transfer of AHNG storage tanks.
研究领域:
储能
·
材料科学
·
化学工程
·
纳米技术
·
材料设计中的人工智能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2017
·
IF 13.858
Fen Liu,Ningdong Feng,Qiang Wang,Jun Xu,Guodong Qi,Chao Wang,Feng Deng
The detailed structure–activity relationship of surface hydroxyl groups (Ti–OH) and adsorbed water (H2O) on the TiO2 surface should be the key to clarifying the photogenerated hole (h+) transfer mechanism for photocatalytic water splitting, which however is still not well understood. Herein, one- and two-dimensional 1H solid-state NMR techniques were employed to identify surface hydroxyl groups and adsorbed water molecules as well as their spatial proximity/interaction in TiO2 photocatalysts. It was found that although the two different types of Ti–OH (bridging hydroxyl (OHB) and terminal hydroxyl (OHT) groups were present on the TiO2 surface, only the former is in close spatial proximity to adsorbed H2O, forming hydrated OHB. In situ 1H and 13C NMR studies of the photocatalytic reaction on TiO2 with different Ti–OH groups and different H2O loadings illustrated that the enhanced activity was closely correlated to the amount of hydrated OHB groups. To gain insight into the role of hydrated OHB groups in the h+ transfer process, in situ ESR experiments were performed on TiO2 with variable H2O loading, which revealed that the hydrated OHB groups offer a channel for the transfer of photogenerated holes in the photocatalytic reaction, and the adsorbed H2O could have a synergistic effect with the neighboring OHB group to facilitate the formation and evolution of active paramagnetic intermediates. On the basis of experimental observations, the detailed photocatalytic mechanism of water splitting on the surface of TiO2 was proposed.
研究领域:
材料科学
·
催化化学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 29
·16949-16958
·
IF 3.119
Yanna Han,Zhuangzhuang Yan,Lijun Jin,Junjie Liao,Guorui Feng
The interactions between O–H groups in kaolinite and re-adsorption water is an important aspect that should be considered in the hydraulic fracturing method for the production of shale gas, because the external water adsorbed by kaolinite in shale would significantly affect the desorption of methane. In this study, the interactions were investigated via changing the amount of O–H groups and re-adsorption water in kaolinite by heating treatment and water re-adsorption. To overcome the overlap of IR vibration bands of the O–H functional groups in H2O and those in parent kaolinite, kaolinite samples with D2O re-adsorption were prepared by drying the H2O from raw kaolinite and soaking the dried kaolinite in D2O. The interactions between O–H groups in kaolinite and D2O molecules were investigated by in situ DRIFT and TG-MS. The results demonstrated that the vibration at 3670 ± 4 cm−1 in the DRIFT spectra could be due to the outer O–H groups of the octahedral sheet on the upper surface of the kaolinite microcrystal structure, rather than a type of inner-surface O–H group. All types of O–H groups, including the inner O–H groups in kaolinite, could be transformed into O–D groups after D2O re-adsorption at room temperature. The inner-surface O–H groups in kaolinite are the most preferred sites for D2O re-adsorption; thus, they would be the key factor for studying the effect of re-adsorption water on methane desorption. When the temperature increased from 100 °C to 300 °C, two layers of kaolinite slipped away from each other, resulting in the transformation of inner-surface O–H groups into outer O–H groups. Thus, the temperature range of 100 to 300 °C was suggested for the heat treatment of kaolinite to decrease the content of inner-surface O–H groups; thereby, the amount of re-adsorption water was reduced. However, to thoroughly remove the re-adsorption water, a temperature higher than 650 °C should be used.
研究领域:
矿物学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2018
·
IF 3.483
Minggang Li,Jian Qiu,Haiping Xing,Donglei Fan,Song Wang,Sanxi Li,Zhiwei Jiang,Tao Tang
The fixation stage of cellular structure during polymer foaming process is difficult to control due to difficult removing of internal heat, especially for crystalline polymers such as polypropylene (PP). In order to control cellular structure in the fixation stage, we established an universal method by introducing water as an in-situ internal cooling agent during the foaming process of PP. Particularly, hydrophilic fillers were added into the high melt flow index polypropylene (HMI-PP) with poor foaming ability to study the effect of adsorbed water on the foaming process of PP/filler composites during sc-CO 2 batch foaming process. Compared to pure HMI-PP, HMI-PP/hydrophilic filler composites showed increased adsorption amount for water and melt viscosity . The water within the composites played a key role in the foaming process, which not only served as a physical foaming agent to increase the volume expansion ratio of PP composite foam, but also showed the function of rapid cooling foam proved by thermal imaging technology. As a result, the presence of some hydrophilic fillers within HMI-PP matrix significantly improved the foaming properties of HMI-PP, including preventing internal bubble collapse and significantly increasing the volume expansion ratio of the foam. The applicability of this method was validated using other PP materials besides HMI-PP, including high molecular weight PP (HMW-PP), high melt strength PP (HMS-PP).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guodong Zhang,Zhe Liu,Daming Liu,Yan Lin,Fei Wang
The volume penalty of nano-porous materials causes low methane volumetric adsorption capacity, and the contradiction between it and gravimetric adsorption capacity limits the application of nano-porous materials in different scenarios. Here, we prepared a composite nano-porous material of ZIF-8@AC to bridge the gap using a synergistic approach of adsorption and hydration, and methane isothermal adsorption in wet ZIF-8@AC was evaluated under low temperature. Due to the hybrid effect of adsorption and hydration, methane storage capacity in the nano-porous material was enhanced. When 100 mg activated carbon was doped, methane gravimetric adsorption capacity in ZIF-8@AC increases by 6.78 % and 30.34 % comparing with that in parent AC and ZIF-8 separately. In addition, the formation of hydrate increases methane storage density in mesopores, macropores and intergranular pores, giving rise to large methane volumetric adsorption, which increases by 12.65 % and 53.24 % comparing with that in parent AC and ZIF-8, respectively. Moreover, hydration efficiency in confined pore space was investigated by differential scanning calorimetry (DSC), while a high-resolution electron microscope was applied to record hydrate morphologies. It was found that hydrate mainly forms in large pore spaces, and the enhanced intergranular pores serve as nanoreactors to significantly improve the hydration efficiency, which is greatly influenced by local water distribution. These findings provide a new strategy to enhance methane adsorption via adsorption and hydration hybrid approach and would shed light on the application of composite nano-porous materials in the adsorption of natural gas.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jiaqi Ma,Xiao-Bin Fu,Yuquan Li,Tian Xia,Likun Pan,Ye-Feng Yao
This study investigates the locations and interactions of adsorbed water molecules within a porous COF material, TpPa-1. The TpPa-1 samples include the as-synthesized powder samples and the samples first subjected to compression at high pressure and then ground into a powder form. The investigation applies a variety of advanced solid-state NMR techniques. The results indicate that the adsorbed water molecules in the as-synthesized and compressed samples can exist in different locations and bonding states. Here, the adsorbed water molecules in the as-synthesized samples are found to be mainly located in the pore spaces and interact only loosely with the chemical groups of the material. In contrast, a proportion of the water molecules in the compressed samples enter into the interstices between the layers and interact with the amino groups and the carbonyl groups of the material. The relocation of the water molecules in the compressed samples provides a plausible explanation for the molecular origin of the water adsorption capability of TpPa-1. In addition, the revealed weak interactions between the water molecules and the chemical groups of TpPa-1 are correlated with the molecular origin of the high water permeance.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guodong Zhang,Zhe Liu,Yaning Kong,Fei Wang
Hydrate-based adsorption and hydration natural gas (AHNG) technology was reported to achieve large methane storage density under mild conditions. In order to enhance methane uptake, a composite nano porous material of MIL-101(Cr)@AC was prepared through fluorine-free hydrothermal reaction, and methane adsorption isotherms for both dry and wet samples were measured under hydrate favorable conditions. Hydrate in-situ formation loaded by the composite material was also carried out, while hydrate kinetics was evaluated by Raman spectrum. It was found that MIL-101(Cr) remains cubic symmetric structure when activated carbon (AC) was doped, but its size decreases with the increase in AC doping amount, while the specific surface area and pore volume significantly increase, and this enhances methane adsorption that increases by 65.58%. More enhanced methane uptake was obtained when wet sample was applied due to adsorption and hydration synergy, wherein methane physical adsorption ability remains, while formed hydrate stores extra methane. The contribution of hydrate to methane uptake is up to 40%, so large methane storage density is anticipated, methane volumetric uptake is up to 179.3 V/V under a mild condition (9.3 MPa and 274.15 K), which increases by 38.03%. Compared with our recently reported ZIF-8@AC, methane storage capacity in this new material increases by 36.5% (Chem. Eng. J., 2023, 455, 140503). In addition, hydrate progressive growth with the increase in adsorption pressure was observed, the area ratio of hydrate large cages to small one finally approaches to the theoretical value of 3:1, suggesting approximately complete conversion of pre-adsorbed water.
研究领域:
材料科学
·
能源化学
·
多孔材料
·
气体储存
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 37
·21386-21403
·
IF 10.733
Xin Song,Jiangle An,Chao He,Jukai Zhou,Yuanting Xu,Haifeng Ji,Li Yang,Jiarui Yin,Weifeng Zhao,Changsheng Zhao
Super adsorbents with ultrahigh adsorption capabilities are highly desired for efficient wastewater remediation. However, most of the adsorbents with high adsorption capabilities are powdery adsorbents, showing inescapable limitations in practical adsorption column application. It is practically urgent to develop a simple and effective method for preparing adsorbents with ultrahigh adsorption capability and convenient column operation ability. Herein, inspired by oviparity, we fabricate super-adsorbent hydrogel spheres (SAHSs) based on self-sacrificing micro-reactors, which achieve the interior cross-linking polymerization of the hydrogel network and subsequent self-disintegration within only 150 seconds. The as-prepared poly(2-acrylamido-2-methyl-propanesulfonic acid-co-acrylic acid) hydrogel spheres show outstanding adsorption capabilities toward organic dyes (4625 ± 231 mg g−1 for methylene blue) and heavy metallic ions (4312 ± 185 mg g−1 for Pb(II)). Remarkably, the adsorption column packed with the SAHSs exhibits splendid removal abilities for organic dyes, which can purify 6280 mL of dye-containing wastewater (150 μmol L−1) thoroughly using only 7 mL SAHSs. This is the first time that a maximum dynamic removal capacity over 50 g L−1 spheres has been obtained using an adsorption column. In addition, the hydrogel spheres also show good recyclability, dynamic filtration–regeneration, selective adsorption and smart separation–regeneration. Thus, the oviparity-inspired method to fabricate super-adsorbent hydrogel spheres has great potential to be used in efficient, economical and environmental wastewater treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EPL
·
2014
·Vol. 106
·期 4
·48001
·
IF 2.269
AiHua Li,Tengpeng Guan,Zhijun Sun
Upconversion nanophosphors (UCNPs) of lanthanide-doped efficient ternary fluoride (β-NaGdF4:Yb3+,Er3+) with sizes below 20 nm are synthesized in a facile solvothermal route. Upconversion luminescence (UCL) of the UCNPs is found to increase with increase of the nanoparticle size prepared at a higher solvothermal-treatment temperature, due to reduction of the surface defects. Interestingly, opposite size dependences of the red/green UCL intensity ratio are observed for the same series of UCNPs in different surface conditions, i.e., with increase of the nanoparticle size, the ratio decreases for as-prepared dry powders, but increases for moisturized counterparts after being exposed in air for some days, and interesting the ratio decreases again after annealing of the moisturized samples. The phenomenon is explained due to the effect of surface defects and adsorbed water molecules, respectively, dominating in nonradiative relaxations, which usually facilitate red UCL. The disclosed phenomenon clarifies some contradictory observations on UCL in the literature.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Cailing Chu,Fei Tan,Jingyu Wang,Tiejun Liu,Zhenghe Xu,Dejun Sun
The dispersion of magnesium hydroxide (Mg(OH)2) particles in kerosene is crucial for the pyrolytic treatment of radioactive organic liquid wastes yet is severely hindered by water preadsorbed on particle surfaces from ambient air. This work investigated the effect of preadsorbed water on the dispersion stability and rheological properties of Mg(OH)2 particles in kerosene. We correlated preadsorbed water content with the suspension’s microstructure and rheology and revealed that powerful capillary attractions between particles induced by preadsorbed water can negate the stabilizing action of surfactants. Mg(OH)2 particles with 8.1% preadsorbed water (mostly in the state of capillary water) formed large, robust aggregates in kerosene, resulting in a higher storage modulus (92 kPa) of the concentrated suspension. Even with the addition of a surfactant polyoxyethylene alkyl ether carboxylic acid (CE10Ac), the storage modulus remained high at 1.8 kPa due to the dominant capillary forces. To overcome this challenge, we proposed a synergistic approach combining particle predrying with surfactant modification. Predrying particles can eliminate the capillary forces by removing the capillary water and enable the effective adsorption of CE10Ac molecules onto individual particle surfaces. This strategy promotes strong steric and solvation stabilization, yielding stable, low-viscosity (<40 mPa·s) suspensions. These findings offer a practical route for preparing advanced materials for radioactive waste treatment.
研究领域:
胶体与界面科学
·
材料科学
·
化学工程
·
核废物处理
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Hai Zhong,Huiyi Liang,Yanzi Yan,Lei Chen,Tianyu Zhao,Lixin Liu,Yongming Chen
Chronic inflammation is a typical feature and a major impediment in refractory diabetic foot ulcer (DFU). High levels of extracellular cell-free nucleic acid (cfDNA) have recently been known to play a critical role in the cause of inflammation. Herein, we fabricated polyacrylamide-based cationic hydrogels and topically applied them to the ulcer of a diabetic rat model. The cfDNA level in the wound area was significantly reduced after hydrogel adsorption, and the level of inflammation was eliminated. In turn, the wound closure was significantly promoted without introducing systemic toxicity. Cationic hydrogels represent an effective material to combat uncontrolled inflammation in DFU.
研究领域:
生物材料
·
伤口愈合
·
糖尿病
·
炎症
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）