INORGANICA CHIMICA ACTA
·
2019
·
IF 2.433
Zhongbao Liu,Wenqi Gao,Xin Qi,Fengfei Lou,Huiwei Lang
In this article, MIL-101(Cr) powder material was successfully prepared by hydrothermal synthesis and combined with different mass fractions of CaCl 2 by immersion method to obtain MIL-101(Cr)/CaCl 2 composite materials. The physical properties of the adsorbent were determined by X-ray powder diffraction, N 2 adsorption/desorption isotherm, TGA and FTIR. The water vapor adsorption performance of MOFs was tested by a gravimetric instrument to analyze the underlying mechanism. Results indicated that the specific surface area, total pore volume, and pore size distribution of micropores and mesopores of MIL-101(Cr)/CaCl 2 composites decreased with increasing CaCl 2 content. When P/P 0 = 0.9, the water vapor equilibrium adsorption capacities of MIL-101(Cr), MIL-101(Cr)/CaCl 2 -10%, MIL-101(Cr)/CaCl 2 -20%, and MIL-101(Cr)/CaCl 2 -30% were 1.05, 0.88, 1.13, and 1.35 g/g, respectively. MIL-101(Cr)/CaCl 2 -30% agglomerated after water absorption, so MIL-101(Cr)/CaCl 2 -20% was selected as the final experimental material. The water vapor adsorption heat of MIL-101(Cr)/CaCl 2 -20% was 42–58 kJ/mol, which is close to the evaporation enthalpy of water (44 kJ/mol at 25 °C). The analysis of the adsorption kinetics showed the relatively uniform adsorption rate of MIL-101(Cr)/CaCl 2 -20%. Overall, MIL-101(Cr)/CaCl 2 -20% exhibited superior water vapor adsorption performance and have great potential for application to adsorption heat pumps.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Xidong Du,Wenfeng Guang,Yugang Cheng,Zhenkun Hou,Zhenjian Liu,Hong Yin,Liang Huo,Ruide Lei,Couxian Shu
The greater adsorption ability of shale to CO 2 offers an alternative method to enhance shale gas recovery, where a potential solution for CO 2 sequestration into a deep shale reservoir can also be realized. Clay minerals are the important storage space for shale gas . In this work, the isotherm adsorption curves of CH 4 and CO 2 on montmorillonite at 288 K, 308 K and 328 K were obtained using gravimetric apparatus. The selectivity factor of CO 2 over CH 4 ( S CO2/CH4 ) and Henry's constants ( K H ) of CH 4 and CO 2 were calculated. More importantly, the thermodynamics parameters of CH 4 and CO 2 , including Gibbs free energy change (Δ G ), surface potential ( Ω ), isosteric heat of adsorption ( Q st ) and entropy change (Δ S ), were thoroughly analysed. The results indicate that all S CO2/CH4 values are obviously greater than one, and injecting CO 2 into a clay-rich shale reservoir to enhance the shale gas recovery is feasible. CH 4 has smaller K H than CO 2 , which shows that CH 4 has a weaker affinity on the montmorillonite surface. Low temperature helps to enlarge K H and promote the adsorption of CH 4 and CO 2 . Increasing the pressure causes the increase in Δ G and Ω of CH 4 and CO 2 . The higher Δ G and Ω of CO 2 compared to CH 4 reveal that the CO 2 adsorption on montmorillonite is more favourable and spontaneous. When the loading increases, the Q st values of CH 4 and CO 2 reduce. CH 4 has a smaller Q st than CO 2 , which suggests the stronger interaction of CO 2 with montmorillonite. CH 4 and CO 2 have decreasing Δ S with the loading. Under larger surface coverage conditions, the disorder of the adsorbed molecules is larger, and most of the injected molecules are trapped as a free state in the pore space . The higher ΔS of CO 2 illustrates that CO 2 molecules constitute a much more stable rearrangement than CH 4 molecules. The temperature has a slight effect on the Δ S of CH 4 and CO 2 .
研究领域:
地质学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chengbao Liu,Dongchen Shen,Zhengkai Tu,Song Li
Li + doping is regarded as an effective strategy to enhance the room-temperature hydrogen storage of metal-organic frameworks (MOFs). In this work, Li + is doped into both MIL-100(Fe) and MIL-100(Fe)/graphene oxide (GO) composite, and it is demonstrated that the hydrogen uptake of Li + doped MIL-100(Fe)/GO (2.02 wt%) is improved by 135% compared with Li + doped MIL-100(Fe) (0.86 wt%) at 298 K and 50 bar, which is ascribed to its higher isosteric heat of adsorption (7.33 kJ/mol) resulting from its more accessible adsorption sites provided by doped Li + ions and ultramicropores. Grand canonical Monte Carlo (GCMC) simulation reveals that Li + ions distributing in the interface between MIL-100(Fe) and GO within MIL-100(Fe)/GO composite is favorable for hydrogen adsorption owing to the increased number of adsorption sites, thus contributing to the enhanced hydrogen storage capacity. These findings demonstrate that MIL-100(Fe)/GO is a more promising Li + doping substrate than MIL-100(Fe).
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2013
·Vol. 21
·期 7
·726-731
·
IF 1.639
Huang Hui,Fan Yifan,Wang Junwei,Gao Haoqi,Tao Shiying
A water-insoluble β -cyclodextrin ( β -CD) polymer was synthesized by reacting β -CD with hexamethylene diisocyanate, and its adsorption kinetics and thermodynamics for phenol from aqueous solution was investigated. The kinetics of adsorption followed the pseudo-second-order model and the adsorption isotherms could be well fitted by the Freundlich adsorption equation. The values of thermodynamic parameters demonstrated that the adsorption was a physisorption in a spontaneous and exothermic process.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Yingcai Zhao,Jiawei Wang,Zongbi Bao,Huabin Xing,Zhiguo Zhang,Baogen Su,Qiwei Yang,Yiwen Yang,Qilong Ren
A magnesium-based metal-organic framework with high hydrothermal stability, Mg-CUK-1, was investigated for the adsorption separation of acetylene from ethylene. The synthesized MOF remained excellent thermostability even near 500 °C according to TGA results. Characterization techniques including FTIR, SEM, and PXRD were utilized to confirm the detailed structure and properties of the Mg-based MOF. It exhibited moderate adsorption capacities of C 2 H 2 (3.01 mmol/g at 100 kPa and 273 K). Moreover, it showed preferential adsorption of C 2 H 2 over C 2 H 4 with C 2 H 2 /C 2 H 4 adsorption selectivity over 3, outperforming some popular MOFs. Furthermore, the isosteric heat of C 2 H 2 (<21 kJ/mol) and C 2 H 4 (<18 kJ/mol) were extremely lower than those MOFs with open metal sites. From an industrial point of view, this MOF could be synthesized in absence of organic solvent, drastically reducing the risk of environmental pollution in the production process. Besides, such advantages as excellent hydrothermal stability, cheap and non-poisonous metal ion resource, high C 2 H 2 adsorption capacity, and low isosteric heat make the Mg-based MOF promising in practical application.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 22
·28396-28407
·
IF 3.056
Hu Guangzhuang,Zhang Wei,Chen Yuantao,Xu Cheng,Liu Rong,Han Zhen
With the development of the boron industry, boron pollution is getting more and more serious, and excessive boron will harm human health. In this paper, graphene oxide was used as a template to prepare ZIF-67, and GO/ZIF-67 was successfully prepared. GO/ZIF-67 was used for the first time to remove boron from water. SEM, XRD, and other characterization methods were used to confirm the structure. The adsorption kinetics, adsorption isotherm, adsorption thermodynamics, and adsorption mechanism of boron by GO/ZIF-67 were studied in this paper. The adsorption capacity of GO/ZIF-67 for boron is up to 66.65 mg·g −1 at 25 °C, and adsorption process reaches equilibrium in 400 min. Adsorption kinetics indicates that the adsorption process conforms to the pseudo-first-order kinetic model, and adsorption thermodynamics indicates that the adsorption process is a spontaneous endothermic process controlled by entropy change. The adsorption capacity of boron by GO/ZIF-67 does not decrease significantly after four cycles. The adsorption of boron by GO/ZIF-67 has both chemical and physical adsorption. From Zeta potential and adsorption kinetics, it can be seen that there is physical adsorption during the adsorption process and boron mainly has positive charge on the surface of GO/ZIF-67 and graphene oxide hydroxyl bonding. Based on the adsorption thermodynamics and XPS, it is known that there is chemisorption during the adsorption process, and mainly the combination of boron and cobalt sites.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Xiaoran He,Bing Xue,Ruixun Wei,Kanglong Liao,Guangyao Li,Taibao Zhao
Adsorption heat pump is a promising technology to generate steam from the recovery of low-grade waste heat. Although the direct contact heat exchange method has been proposed in the adsorption heat pump, the presence of free water within the adsorbents limits the improvement of system performance. In this work, a shell-core structure was prepared using a hydrothermally stable zeolite 13X as the core and a hydrophobic bio-based polyurethane as the shell through a drum coating method. The Scanning Electron Microscopy results proved the successful preparation of shell-core zeolites with a shell layer thickness ranging from 7.5 to 9.0 μm. Thermogravimetric analysis results showed that the shell-core zeolite exhibited good thermal stability up to 300 °C. The water content is reduced by 69 % compared to unmodified zeolite 13X. Cyclic operation based on a packed bed of the shell-core zeolite showed 218 ∼ 233 °C steam generated from hot water at 72 °C, while 140 °C hot dry gas was used for regeneration. The steam temperature and generation rate of the shell-core zeolite were increased by 22.7 % and 21.6 %, respectively. The mass of free water within the packed bed was greatly reduced by 49.3 %, which resulted in a 49.4 % reduction in regeneration consumption. The Coefficient of Performance for Heating and Specific Heating Power of the shell-core zeolite were maximized by 91 % and 12.3 %, respectively. The tiny protrusions on the surface of the silicon dioxide-modified shell and the air within the pores created an air film that effectively prevented liquid water. Consequently, water could only enter the adsorbent in the form of water vapor. Overall, shell-core zeolite is a suitable adsorbent that can greatly reduce regeneration energy consumption and effectively improve system efficiency. It is foreseeable that the adsorbent preparation method presented in this work will provide a means for advancing the fields of coated slow-release fertilizers and gas separation.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Pengyu Sun,Feiyu Gao,Wei Shi,Hengyuan Zhang,Shiao Du,Wei Chen,Meng Li
Boron adsorbents with high adsorption capacities have long been a focus of research for a long time. This study used small molecular polyols with different hydroxyl groups as functional monomers and as end-capping agents, functional dendritic polyurethanes with nano structure were successfully prepared by one-pot method. The single molecule size and surface morphology were characterized by dynamic light scattering, transmission electron microscopy and scanning electron microscopy, and the molecular size in the dry state was 11 to 18 nm. The prepared materials were used as the boron adsorbents, and the effects of pH, time, boron solution concentration and temperature on the adsorption were studied. The results showed that the capacity of adsorbed boron could reach 110–130 mg·g –1 . Adsorption was a homogeneous monolayer adsorption controlled by chemisorption, and adsorption thermodynamics showed that was a spontaneous endothermic process. Adsorption behavior was best described by the pseudo-second-order kinetic model and the Langmuir isotherm. This study also showed that it was difficult for ortho/meta-hydroxyl groups to chelate with H 3 BO 3 and other polyborates, and the chelates mainly had good chelating properties with B(OH) 4 – , and the chelates formed had large steric hindrance. At the same time, increasing the number of hydroxyl groups of functional monomers was beneficial to increase the adsorption capacity of materials. In addition, the cyclic adsorption/desorption experiments showed that DPUs have good cyclic stability. At the same time, the adsorption results of the original salt lake brine showed that other metal ions in the brine had little effect on the adsorption of boron, and the adsorption capacity was as high as 52.93 mg·g –1 , and the maximum adsorption capacity was obtained by Adams–Bohart model to 58.80 mg·g –1 . The outstanding selectivity and adsorption capacity of these materials have broad potential application, and are expected to be used for the efficient adsorption and removal in boron-containing water bodies.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2012
·
IF 3.07
Peng Liao,Songhu Yuan,Wenjing Xie,Wenbiao Zhang,Man Tong,Kun Wang
The adsorption kinetics and thermodynamics of nitrogen-heterocyclic compounds (NHCs), pyridine, indole and quinoline, in aqueous solutions on bamboo charcoal (BC), as well as the regeneration of spent BC by microwave radiation, are investigated. BC is produced by incomplete combustion of moso bamboo at high temperature and nitrogen atmosphere. Adsorption kinetics is analyzed using pseudo-first-order and pseudo-second-order as well as Weber–Morris model. The results show that NHC adsorption on BC is predominantly regulated by surface diffusion in initial 1 h followed by intraparticle diffusion in later stage. BC exhibits a strong adsorption affinity to NHCs, and the adsorption isotherms are well described by Freundlich model. Thermodynamic analysis indicates that the adsorption is spontaneous and endothermic. Adsorption site energy analysis illustrates a distribution of adsorption energy, which indicates the heterogeneous sites on BC for NHC adsorption. Furthermore, spent BC with NHC adsorption can be effectively regenerated by MW radiation. The adsorption capacity becomes even higher than that of virgin BC after five times of adsorption–regeneration cycles. This study proves BC is a promising adsorbent for NHC removal in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2022
·
IF 11.533
Abel Mehari,R.Z. Wang,Z.Y. Xu
Sorption thermal energy storage is one of the promising solar thermal energy storage considering its long-term storage ability. Since the common sorption thermal storage suffers from low sorption capacity, a high energy storage density enhancement mechanism is always essential for a cost-effective and compact storage system. With three-phase sorption thermal storage, high energy storage density from the crystallization sorption process can be achieved. However, such a sorption process brings significant challenges, including crystal blockage issues in absorption system or solution leakage handling problems in adsorption system, which need to be resolved. Here, we showed a high-performance sorption thermal storage that can attain high energy storage density via a full liquid-to-solid state sorption process. Such a process is achieved by adopting moist air as heat and mass transfer media, which enables liquid absorption, crystallization, and solid adsorption in a simple configuration simultaneously. The lab-scale model achieved high energy storage density in the range of 333–405 kWh/m 3 resulting from the heat of absorption and crystallization of LiCl, which is the record value for liquid absorption systems. The energy storage density obtained from the dual liquid and solid sorption processes is enhanced by 278 % compared with that of the conventional cycle at 70 % RH (relative humidity) and temperature lift of 10 °C. With simple construction and high energy storage density, the proposed system has great potential in real applications.
研究领域:
能源技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2024
·
IF 9.9
Aimin Li,Qiongfen Yu,Ming Li,Rong Zhu,Shengnan Sun,Danya Zhan,Xuewu Li,Yiping Xia,Zhihao Song,Xiaokang Guan,Yunfeng Wang
Solar drying is an energy-efficient and environmentally friendly method. However, during periods without sunlight, the lack of energy input to the dryer causes it to cease drying, leading to challenges such as water vapor condensation and product rehydration. To address this, our study proposed a continuous solar dryer (CSD) that integrated conventional solar drying with sorption thermal energy storage (STES), characterized by internal circulation dehumidification at night. The inclusion of adsorption beds within the dryer removed water vapor inside the drying chamber and released sorption heat to supply energy for continuous drying. A series of composite adsorbents was prepared based on an activated carbon fiber (ACF) matrix through impregnation and spraying methods. Among these, ACF-calcium alginate-1/1 (ACF-CA-1/1) was identified as the optimal adsorbent for system-scale preparation and then used for drying mushrooms. Experimental results showed that ACF-CA-1/1 exhibited an adsorption capacity of 0.45 g/g at 20 ℃ and 80 % relative humidity (RH), with an energy storage density of 676.7 J/g. During nighttime drying from 21:00 to 9:00, the adsorption beds facilitated a reduction of 2.64 kg water from 10 kg mushrooms, resulting in a moisture ratio decrease of 29.53 %. The average RH within the drying chamber with STES was 61.37 % and 45.46 % on the first and second nights, respectively. Furthermore, the overall energy efficiency and specific moisture extraction rate of the dryer with STES were 15.50 % and 6.9 × 10 −5 kg/kJ, respectively. Those of the dryer without STES were 14.23 % and 6.3 × 10 −5 kg/kJ for the same factors, respectively. Notably, solar drying with STES achieved a 30.74 % decrease in RH of drying chamber, an 8-hour reduction in drying time, and a 1.27 % increase in energy efficiency compared to solar drying without STES. Herein, the CSD effectively overcame the rehydration problem of agricultural products at night, offering a promising solution to the intermittent nature of solar drying.
研究领域:
食品科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2018
·Vol. 57
·期 2
·157-164
·
IF 2.588
Haixiang Wang,Lili Yuan,Hua Zhu,Risheng Jin,Jiudong Xing
In this study, the molecularly imprinted polymers (MIPs) of capsaicin are prepared by bulk polymerization (MIPs1), precipitation polymerization (MIPs2), and surface imprinting technology based on SiO 2 /Fe 3 O 4 particles (MIPs3), respectively. MIPs are characterized by scanning electron microscopy and fourier transform infrared spectroscopy. The adsorption kinetics and thermodynamics of these composites are also investigated to estimate their capacity to rebind capsaicin. The adsorption kinetics show that the adsorption process of MIPs1 is fitted to pseudo first-order kinetic model, while the kinetic properties of MIPs2 and MIPs3 are well described by pseudo second-order kinetic model. Adsorption thermodynamics analysis indicated that there are two kinds of binding sites with different affinity in each MIPs, whereas only one kind of binding site in non-imprinted polymers. All adsorption isotherms of MIPs are fitted to Freundlich models, illustrated that binding sites are distributed heterogeneously in the surface of the materials, and the adsorption might occur in the multimolecular layers. Comparisons of experimental data of three MIPs are achieved and the results show that MIPs3 has the best affinity and absorption capacity to capsaicin. Moreover, the MIPs3 maintain the magnetic properties of Fe 3 O 4 particles, which will be applied to the rapid separation of capsaicin from chili peppers samples. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019 , 57 , 157–164
研究领域:
材料科学
·
化学工程
·
食品科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）