International Journal of Coal Preparation and Utilization
·
2024
·
IF 2
Cuiling Ye,Feng Wu,Yijiang Li,Hongxin Qiu,Yanfeng Li
The flotation mechanism of multiple compound collectors called ZKC-I for coal gasification fine slag (CGFS) was revealed from the flotation kinetics, adsorption properties, bubble–particle interaction, and froth properties. The results were compared to dodecane, which represents the conventional nonpolar hydrocarbon oil collector. The flotation concentrates yield and rate constant of CGFS treated by ZKC-I were 2–3 times than those of CGFS treated by dodecane. Fourier transform infrared spectroscopy and wrap angle results showed that ZKC-I improved the hydrophobicity of residual carbon because of the synergistic adsorption of fatty acids, esters, and aromatic hydrocarbons in the ZKC-I on the heterogeneous surface of residual carbon particles, which enhanced the adhesion between residual carbon particles and bubble. Due to the strong carrying capacity of the bubble to residual carbon particles, the number of residual carbon particles in the froth treated by ZKC-I was more than that of the CGFS froth treated by dodecane. The high content of carbon particles in the froth resulted in great stability of the flotation froth, and the maximum height and half-life of the froth were higher than that of CGFS treated by dodecane. This study has practical and theoretical significance for the separation of coal-based solid waste.
研究领域:
矿物加工工程
·
环境科学与工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 11
·1402-1410
·
IF 3.815
Ni Qing-Sheng,Du Miao,Shan Guo-Rong,Song Yi-Hu,Zheng Qiang
Poly(vinyl alcohol) (PVA) is usually processed and used in a form of aqueous dispersion. A large number of inter- and intramolecular hydrogen bonds make it very difficult to obtain suitable rheological behavior for processing. In this study, carbon particles with different topological shapes were added into PVA aqueous dispersion to tune the steady and dynamic rheological behavior. The results show that the zero-dimensional particles (carbon black, CB) increase monotonically the zero-shear viscosity of PVA dispersion, while the one-dimensional particles (carbon nanotubes, CNTs) make it first increase, and then decrease and rise again, like an N-shape, and the two-dimensional particles (graphene oxide, GO) can make it first decrease and then increase, exhibiting a U-shape. It is believed that the topological shape of the carbon particles brought about these discrepancies. The zero-dimensional particles mainly act as physical crosslinking points due to their small size. While at a certain content, both CNTs and GO can destroy the intermolecular hydrogen bonds between PVA chains because the PVA chains can twine around the slim CNTs and the large planar size of GO prevents the adsorbed PVA from forming hydrogen bond with other chains. The high hydroxyl value of carbon particle surface could strengthen this effect. It is expected that the viscosity of polymer dispersion can be regulated by particles with different topological shape and the surface characteristic, so as to widen the operable concentration range during preparing composite functional materials.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yong-Sheng Wang,Tian-Yi Li,Ya-Qi Ba,Zhe Zheng,Guang-Ping Hao,An-Hui Lu
Adsorptive separation of propylene/propane is an energy efficient way to produce high purity propylene, which is an essential chemical for the production of a variety of important monomers/polymers. The central task is to devise porous materials that can recognize the subtle difference between propylene/propane. The understanding of the selective adsorption and dynamic diffusion behaviors in nanopores at different length scales is key for efficient separation, however, remains elusive. Here we target at this issue by devising “mortar-and-cobblestone” type carbon pellets (MCCs) as model adsorbents, which showed tunable combinations between micropores and mesopores. As the volume ratio of mesopore to micropore increases from 0.37 to 1.33, the adsorption capacity of propylene increases from 2.4 to 2.9 mmol g −1 at 100 kPa and 298 K, and its diffusion rate is 3.28 times increased. In particular, the adsorption of propane displays a unique two-step diffusion behavior in the MCCs, which quantifies the contribution of the mass transport mesopores and gas sieving micropores to their adsorptive separation. In addition, the MCCs are in pellet form and mechanically strong with a compressive strength of 17.4 MPa, which further ensures their potential in molecular separation practice.
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
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Lin Zhichao,Qiao Xiuwen
Coral reef has a unique dendritic structure with large specific surface area, rich pore structure, so that it can be attached to a large number of zooxanthellae for gas exchange. Coral reef ecosystems are also known as underwater rainforests. Inspired by this biological structure, we designed and fabricated coral-like Co 3 O 4 decorated N-doped carbon particles (Co 3 O 4 /N-CP). The obtained Co 3 O 4 /N-CP-900 catalyst shows efficient ORR electrocatalytic performances in an alkaline medium with a positive onset and half-wave potentials of 0.97 and 0.90 V (vs. RHE), as well as a high diffusion-limited current density (5.50 mA cm −2 ) comparable to that of a Pt/C catalyst (5.15 mA cm −2 ). It also displays better stability and methanol tolerance than commercial Pt/C. In addition, the Co 3 O 4 /N-CP-900 electrode has a high specific capacitance of 316.2 F g −1 in 6 M KOH, as well as good rate capabilities and excellent cycle performance. These results are due to large surface area, narrow pore size distribution, high density electrochemical energy conversion and storage activity centers. This method presented here offers an effective path for the development of high performance multi-functional carbon-based materials for ORR and supercapacitor applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 13
·6591-6596
·
IF 2.562
Xinghong Zhang,Baosheng Xu,Changqing Hong,Jiecai Han,Faxiang Qin,Wenbo Han,Haiming Cheng,Chen Liu,Rujie He
Carbon-bonded carbon fiber composites (CBCFs) containing SiC particles with uniform microstructure were produced using an innovative dispersion and flocculent approach. The mixed phenolic (Pf), SiC particles and chopped carbon fibers (Cf) were blended uniformly using polyethyleneimine (PEI) as a dispersant and polyacrylamide (PAM) as a flocculating agent. A homogeneous distribution of SiC particles coated CBCFs was obtained with the addition of 0.6 wt% PEI and 0.8 wt% PAM. The effect of PEI and PAM content on the microstructure, slurry dispersibility and stability of SiC-modified CBCFs was investigated. The compressive strength and compression modulus of the SiC-modified CBCFs were improved compared with unmodified CBCFs. This simple and versatile approach can be used to prepare large-scale and modified CBCFs.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jing Wu,Tingting Zhang,Jin Qu,Fan-Zhen Jiao,Chen Hu,Hao-Yu Zhao,Xiaofeng Li,Zhong-Zhen Yu
Although the emerging interfacial solar steam generation technology is sustainable and eco-friendly for generating clean water by desalinating seawater and purifying wastewaters, salt deposition on the evaporation surface during solar-driven evaporation severely degrades the purification performances and adversely affect the long-term performance stability of solar steam generation devices. Herein, to construct solar steam generators for efficient solar steam generation and seawater desalination, three-dimensional (3D) natural loofah sponges with both macropores of the sponge and microchannels of the loofah fibers are hydrothermally decorated with molybdenum disulfide (MoS2) sheets and carbon particles. Benefiting from fast upward transport of water, rapid steam extraction, and effective salt-resistant capacity, the 3D hydrothermally decorated loofah sponge with MoS2 sheets and carbon particles (HLMC) with an exposed height of 4 cm can not only obtain heat by its top surface under the downward solar light irradiation based on the solar–thermal energy conversion but also gain environmental energy by its porous sidewall surface, achieving a competitive water evaporation rate of 3.45 kg m–2 h–1 under 1 sun irradiation. Additionally, the 3D HLMC evaporator exhibits long-term desalination stability during the solar-driven desalination of an aqueous salt solution with 3.5 wt % NaCl for 120 h without apparent salt deposition because of its dual type of pores and uneven structure distribution.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2025
·
IF 4.3
Chengping Deng,Teng He,Liuyang Dong,Yuqiang Mao,Peilun Shen,Dianwen Liu
Dynamic pore wetting plays a major role in the flotation of porous mineral particles. However, the role of chemical properties of the liquids in dynamic pore wetting is not systematically studied. This paper studied the dynamic pore wetting process of the porous carbon particles by 10 g/L NaOL solution and n-hexadecane at different wetting times using a 1 H low-field nuclear magnetic resonance (LF-NMR). The mechanism of chemical groups of liquids affecting the pore wetting percentage and floatability of porous particles was revealed by FTIR, zeta potential, contact angle, and particle-bubble attachment tests. The results displayed that the pore wetting percentage of the particles wetted by NaOL solution was larger than that by n-hexadecane except for mesopores. Compared with the raw sample, the surface potential of the particles wetted by n-hexadecane was decreased and that by NaOL solution were negative. The NaOL, as an amphiphilic reagent contained some hydrophobic and hydrophilic functional groups, which was different from the n-hexadecane. The NaOL molecule could be easily adsorbed into the particles by electrostatic interaction compared with n-hexadecane, achieving a better surface hydrophobicity of the particles. Thus, the floatability of porous carbon particles wetted by NaOL solution was larger than that by n-hexadecane.
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Yang Fei,Mei Liang,Tao Zhou,Yang Chen,Huawei Zou
Recently, lightweight and highly efficient electromagnetic interference (EMI) shielding composites are crucial but changing for the development of modern electronics and telecommunication. Here, a novel polyhedral Co/C particle embedded carbon nanofiber (CNF@Co/C) aerogels were synthesized via pyrolysis of bacterial cellulose wired zeolitic imidazolate frameworks-67 (ZIF-67) aerogel under argon. The flexible CNF@Co/C aerogels exhibit a high EMI shielding effectiveness (SE) is approaching 56.07 dB at a density of only 0.023 g cm −3 in the X band , and the average absorption coefficient is as high as 0.79, indicating 79% of electromagnetic (EM) waves are absorbed in shielding process. The remarkable performance results from the three-dimensional (3D) CNF-threaded porous structure with interconnected network and the magnetic Co/C particle strung by CNF, which contribute to a conduction loss and optimal impedance matching along with multiple polarization and strong magnetic loss. This work paves a promising way for the new generation of electronic device with lightweight and efficient EMI shielding.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 9
·e17281
·
IF 3.993
Ze Dong,Bei Li,Hua Shang,Peixin Zhang,Shixia Chen,Jiangfeng Yang,Zheling Zeng,Jun Wang,Shuguang Deng
The adsorptive separation of CH 4 from low-grade coal-bed gas can be performed at decentralized and remote coal mines, and it uses more energy- and is cost-efficient than the traditional cryogenic distillation process. Herein, we present a facile method to prepare ultramicroporous carbon granules with a narrow pore-size distribution at 0.5–0.6 nm. To our knowledge, such centered and uniform pore-size distribution in carbon granules has never been reported. The carbon granules can be directly utilized in adsorption columns without a granulation or pelletization process. The granular oil-tea-shell-derived porous carbon (GOC-2) exhibited a record-high CH 4 uptake of 1.82 mmol/g and CH 4 /N 2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH 4 /N 2 separation performances were confirmed from the results of dynamic breakthrough experiments and pressure swing adsorption simulations. This work provides a novel strategy for developing ultramicroporous carbon granules and guides the future design of efficient CH 4 /N 2 separation adsorbents.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Mining Metallurgy & Exploration
·
2024
·Vol. 41
·期 2
·1051-1067
·
IF 1.5
Wang Shiwei,Wei Guomin,Kong Rongjie
Owing to the selective oxidation and uneven combustion that occur on the surface of carbon anode, some carbon particles detach and form carbon residue, which is defined as spent anode slag (SAS). The highly graphitized and toxic impurities such as fluorite (CaF 2 ), corundum (α-Al 2 O 3 ), and cryolite (NaAl 11 O 17 ) are crucial components of SAS resource but are difficult to separate from graphite. This study developed a method of using water-soluble (emulsified) kerosene to separate the carbon particles from the toxic impurities in the SAS resource. The flotation purification approach of utilizing conventional kerosene was experimentally investigated and compared with that of using water-soluble kerosene. The results showed that with the use of emulsified kerosene, the maximum combustible matter recovery of the carbon particles was 89.86% while that of using traditional kerosene was 80.30%. The emulsified kerosene was comprehensively examined by various instruments to clarify its adsorption mechanism on the carbon particle surfaces. Because of the superior dispersibility of emulsified kerosene, it effectively envelops carbon particles with a smooth surface, oxygen-containing functional groups, and hydrophilic C–F bonds, thereby increasing the surface hydrophobicity and flotation responses of targeted carbon particles.
研究领域:
冶金学
·
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xin Jin,Chengxiong Wei,Kai Li,Peinan Yin,Chengwei Wu,Wei Zhang
Wound healing is a complex process involving a complicated interplay between numerous cell types and vascular systems. Hyaluronic acid (HA)-based hydrogel facilitates wound healing, and is involved in all processes. However, slow gelation speed and weak adhesion strength limit its ability to form a stable physical barrier quickly. Herein, we propose a HA-based composite hydrogel as the wound dressing based on oxidative coupling reaction. Tannic acid and dopamine-coated carbon particles (DCPs) containing abundant phenolic hydroxyl groups are incorporated into the HA-based hydrogel for increasing the number of crosslinking sites of oxidative coupling of the hydrogel and enhancing adhesion through the formation of covalent bonds and hydrogen bonds between hydrogel and wound sites. The composite hydrogel exhibits short gelation time (<6 s) and high adhesion strength (>8.1 kPa), which are superior to the references and commercial products of its kind. The in vitro experiments demonstrate that the hydrogel has low hemolytic reaction, negligible cytotoxicity, and the ability to promote fibroblast proliferation and migration. The in vivo full-thickness skin defect model experiments demonstrate that the hydrogel can accelerate wound healing under mild photothermal stimulation of DCPs by reducing inflammation, relieving tissue hypoxia, and promoting angiogenesis and epithelialization.
研究领域:
生物材料
·
组织工程
·
伤口愈合
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）