JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2016
·
IF 3.652
Shun Zhou,Qing He,Xiaofeng Wang,Min Ning,Ying Yang,Yingbo Xu,Yaping Zhang,Peng Zou,Zhenfeng Tian,Kaibo Chen,Hua Wang,Shike She
The effects of exogenous potassium salts on the thermal degradation of flue-cured tobacco were investigated using thermogravimetric analysis (TGA), surface area/porosity measurements (SAPM), real-time fourier transform infrared (RT-FTIR), and thermogravimetric/Fourier transform infrared spectrometry (TG-FTIR), respectively. TGA analysis showed that potassium salts accelerated tobacco’s degradation at around 150–350 °C, but improved the thermal stability of char residue at high temperature range. The porous texture analysis displayed that potassium salts reduced the pore volume and surface area of tobacco pyrolysis residues. Further study using RT-FTIR illustrated that there was a positive catalysis of potassium salts with C O, O H and C O bonds at different temperature ranges, but a protective effect was given to C H bond, C C bond and aromatic moieties except for the accelerating degradation of C H by the oxidation effect of KNO 3 . The evolution comparison of their gaseous products manifested that potassium salts cut down the emission of CO 2 , H 2 O, CO, aldehydes and alkanes, but enhanced the release of carbonyl compounds, anhydrides and alcohols at around 150–350 °C. Above 350 °C, the potassium salt-containing samples exhibited a gentle escape process for both the oxygen-bearing molecules (CO 2 , H 2 O and CO) and oxygen-free species (alkanes, methane and unsaturated compounds) in comparison with their quick emission for the virgin samples.
研究领域:
烟草科学
·
热化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Zhaobing Fu,Kai Sun,Huailin Fan,Chao Li,Hong Liu,Shu Zhang,Kuan Ding,Guanggang Gao,Xun Hu
Furfural residue is a solid waste produced in manufacturing furfural from biomass like corncob, which can be converted into liquid/gaseous fuel and activated carbon via chemical activation. In this study, in addition the pore structure of activated carbon, the impacts of varied potassium salts (KCl, KOH, K 2 CO 3 and K 2 C 2 O 4 ) on the properties of gases and bio-oil formed during activation of Furfural residue was studied. The results showed that the potassium salts suppressed cracking of condensable volatiles into gases, producing more bio-oil at expense of gases. KOH showed the highest activity for cracking, producing the lowest yield of activated carbon (4.8%) without activator with lower degree of crystallization than that K 2 CO 3 and K 2 C 2 O 4 as activators (20.1% and 26.9%). The activated carbon activated with K 2 CO 3 or K 2 C 2 O 4 showed the flaky membrane structure packed with varied layers, but not with KOH as the activator. K 2 C 2 O 4 , KOH and K 2 CO 3 as the activators could promote cracking, deoxygenation , dehydrogenation and aromatization reactions, generating abundant micropores , while KCl could not. In addition, K 2 C 2 O 4 as the activator of furfural residue showed the least energy consumption and environmental impacts, while with KCl was highest. The results herein demonstrated the potential of furfural residue as feedstock for the production of activated carbon and liquid fuels .
研究领域:
能源与燃料
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Rui-Zhi Cui
The experimental solubility of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O and KCl–K 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O systems was measured at 288.15 K. The corresponding stable phase diagrams and water content diagrams were plotted by experimental results. Double salt was formed in both two systems. There are six phase fields, nine univariant solution curves and four invariant points in the phase diagram of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O system. And the diagram of another system has seven invariant points and eight crystallization regions. By using multiple linear regression method, parameter Ψ Li,Cl,SO4 and the solubility equilibrium constants of double salt KCl·MgSO 4 ·3H 2 O were obtained by solubility data fitting at 288.15 K. The equilibrium solubility of salts in above systems at the same temperature was predicted with Pitzer's electrolyte solution model and mathematical calculation software. The results indicate that the predicted data are in correspondence with experiments.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Bo Yin,Hai Tian,Haiyong He,Kam Loon Fow,Honglei Zhang,George Z. Chen,Di Hu
Biomass-derived carbon for supercapacitors faces the challenge of achieving hierarchical porous carbon with graphitic structure and specific heteroatoms through a single-stage thermal process that minimises resource input. Herein, molten base carbonisation and activation is proposed. The process utilises the inherent moisture of Moso bamboo shoots, coupled with a low amount of KOH, to form potassium organic salts before drying. The resultant potassium salts promote in-situ activation during single-stage heating process, yielding hierarchical porous, large specific surface area, and partially graphitised carbon with heteroatoms (N, O). As an electrode material, this carbon exhibits a specific capacitance of 327F g −1 in 6 M KOH and 182F g −1 in 1 M TEABF 4 /AN, demonstrating excellent cycling stability over 10,000 cycles at 2 A/g. Overall, this study presents a straightforward process that avoids pre-drying of biomass, minimises base consumption, and employs single-stage heating to fabricate electrode carbon suitable for supercapacitors.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3646-3652
·
IF 1.338
Yang Ailing,Wang Ning,Wang Yujin,Li Shunpin,Wang Lele,Yang Yun,Bao Xichang,Yang Renqiang
Silver nanoparticles (NPs) with diameters less than 25 nm, and 5, 10, 15, 20-tetrakis(4-carboxy-phenyl) porphyrin potassium salt (K4TCPPS) was synthesized. By adding silver colloids into the K4TCPPS solutions, the fluorescence concentration quenching of the K4TCPPS
solutions was improved between 1×10−6–5×10−4 M, depending on the size of the Ag NPs, the concentration of the K4TCPPS and the excitation wavelength. Under excitation wavelengths of 360 and 414 nm, the enhancement was in the range
of 0.34–22.8, and 0.71–82.46, respectively. The enhancement increased with decreasing size of the Ag NPs. At the two highest enhancements, the concentrations of the K4TCPPS solutions were 1×10−4 and 1×10−5 M respectively,
and the size of the Ag NPs was about 5 nm. The main reasons for the fluorescence enhancing effect are due to fluorescence resonance energy transfer (FRET) between K4TCPPS molecules and Ag NPs, and decreased collision quenching between free K4TCPPS molecules, and free K4TCPPS
molecules with Ag NPs. Our results showed that Ag NPs with sizes of about 5 nm can effectively improve the fluorescence concentration quenching of K4TCPPS solutions. This result also suggests that it is possible to use noble metal NPs to improve fluorescence concentration quenching.
研究领域:
材料科学
·
光学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Zhongshu Li,Yuli Xue,Xiaoling Tan,Wenqing Li,Shaonan Xu,Ziyan Wang,Jian Wang,Lina Li,Shiding Miao
It is of great importance to separate potassium salts from carbonate-based lakes, especially the low-[K+] but high-[Na+] brine which has been discovered around the world. Here the phase diagram of the quaternary system Na+, K+//Cl–, CO32––H2O was experimentally studied at 298.15 K via the method of isothermal evaporation, and the results corrected the previous diagram reported by Blasdale (J. Am. Chem. Soc.1923, 45, 2935–2946). The type of salts appeared and their solubility during the evaporation, and the density vs composition diagram and the pH values were plotted based on the experimental data. It was found that there were six invariant points, seven univariant curves, and five crystallization fields in the equilibrium phase diagram. To extract single-salt of potassium, certain areas in the Na+, K+//Cl–, CO32––H2O diagram were chosen to be acidified by the compressed CO2, and potassium in the form of KHCO3 was precipitated from the mother solution. The compressed CO2 was able to avoid formation of NaKCO3·6H2O during evaporation of the original system Na+, K+//Cl–, CO32––H2O. Based on experiment data, the region area for potassium salt extraction was determined, and this area was suitable for extracting K+ salts from brines with a [Na+/K+] ratio even lower than 0.44. This strategy opened a new way to recovery of potassium with a maximum yield of 59.88% from the carbonate-chloride-based brine.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POULTRY SCIENCE
·
2019
·
IF 2.027
Ying Zhou,Yu Wang,Fei Ma,Pei-jun Li,Bao-cai Xu,Cong-gui Chen
The effect of high-pressure processing (200 MPa, 10 min) on the solubility of chicken breast myosin with 25% molar substitution of Na + by 3 anion types of potassium salts (KCl, K-lactate, and K-citrate) was investigated. The results showed that the lower hydrophobic group and reactive sulfhydryl group of nonpressurized myosin with the replacement of organic K-lactate or K-citrate possibly contributed to the aggregation of myosin molecules compared with the KCl group and thus decreased the solubility of both. In the presence of lactate or citrate, the high-pressure processing caused an increase in the surface hydrophobicity and reactive sulfhydryl group, indicating the unfolding of myosin molecule. Meanwhile, the increased hydration state and the decreased apparent viscosity suggested the disruption of protein–protein interactions and the strengthening of myosin–water interactions in pressurized myosin, ultimately resulting in increased solubility of the pressurized myosin with both organic potassium salts. The compensation of high-pressure processing is interesting for the efficient selection of the anion type in developing sodium-reduced industrial meat products.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Guangfeng Dong,Huanyu Zhu,Hao Yi,Peng Chen,Feifei Jia,Luis A. Cisternas,Shaoxian Song
Particle shape plays an important role in flotation. The strategy of regulating particle morphology during crystallization process to make it more suitable for flotation was proposed. Crystalline particles were more regular than ground particles, and mainly in a cubic-like shape. The results of micro flotation tests indicated that crystalline samples floated better than ground samples in a wide size range. Adsorption capacity tests suggested that there was almost no difference in the adsorption amount of SDBS between ground and crystalline sample. Morphology analysis and bubble-particle attachment experiment demonstrated that the geometric features of crystalline particles facilitated the longer three-phase lines, making the attachment between crystalline sample and bubble more stable, which could be thought as the main reason for the higher floatability of crystalline sample. The novel strategy called “crystal-regulation flotation” could provide an innovative idea for the flotation of soluble potassium salt and promote the development of flotation technology.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Bo Xian,Wei Tang,Dongfang Xiang,Chenyang Rao,Xiaying Liu,Fang Fang,Fuhao Chu,Tao Fang
In this study, Microcystis aeruginosa was effectively transformed into high-surface-area biochar using four different organic potassium salts as activators, achieving a maximum specific surface area of 2933 m 2 ·g −1 . The resulting biochar exhibited an outstanding adsorption capacity for tetracycline hydrochloride, reaching up to 969.9 mg·g −1 . Our findings reveal that a higher potassium content in the precursor correlates with an increased surface area of the biochar, while lower self‑carbonization temperatures or higher melting points of the organic potassium salts promote a greater proportion of mesopores. Hydrogen bonding was identified as the primary adsorption mechanism, with density functional theory providing further insights into its significant role. This research presents a controllable, efficient, and environmentally friendly strategy for biochar activation and offers a predictive framework for optimizing biochar properties through organic potassium salt modification, laying a solid theoretical foundation for the design of advanced adsorbents with enhanced performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jianfei Xiao,Xiaofang Yuan,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Heteroatomic doped porous carbon (HPCs) is a promising advanced material, showing great application potential in greenhouse gas capture. Here, in-situ N-doped porous carbon (NPC) was developed via a novel and readily scalable strategy − one-step solvent-free melt polycondensation assisted by organic potassium salts, followed by pyrolysis and activation. As both a template and an activator, the added C 6 H 5 K 3 O 7 played an important role to create abundant microporous structure. The as-fabricated NPC-650–0.5 showed a rich N content (6.11 at.%), abundant narrow micro-porosity (0.3437 cm 3 ·g −1 ), and a high surface area (1209.37 m 2 ·g −1 ) and delivered an excellent CO 2 static adsorption capacity (4.16 mmol·g −1 and 8.40 mmol·g −1 at 100 and 500 kPa), a fast adsorption kinetics (circa 98% of balance capacity in 12 min), moderate heat of adsorption (25 to 30 kJ/mol), high selectivity of CO 2 /N 2 , and outstanding uninterrupted recyclability. Both the narrow micropore volume and N-doping sites had strong effects on the CO 2 adsorption capacity, indicating a physical and chemical adsorption process with the mechanism being multi-layer adsorption by the micropore filling. This work highlights the great potential of the NPC-650–0.5 for capturing CO 2 and offers new insights into a green activator and a simple and easy-to-scale method for preparing HPCs.
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
MINERALS ENGINEERING
·
2024
·
IF 4.9
Yuan Yuan,Weiquan Zhan,Yang Tian,Alejandro López Valdivieso,Hao Yi,Shaoxian Song,Luis A. Cisternas,Feifei Jia
By understanding minerals as crystals, a crystallization-controlled methodology was performed to enhance the floatability of soluble minerals. Here, aimed strategies were applied to modulate the crystallization of KCl salt to grow crystals with various shapes as cubic-, hopper- and needle-like structure. Stereoscope and scanning electronic microscopy (SEM) helped to unveil the morphologies where X ray diffraction (XRD) characterized their high crystallinities. Afterwards, Atomic Force Microscope (AFM) was performed to research the crystallizing behaviors that cubic-like structure was obtained by turbid fast growth, while hopper-like structure formation was due to the constant high supersaturation and needle-like crystal occurred under still fast crystallization. Flotation tests with octadecylamine hydrochloride (ODA) as collector demonstrated the floatability of samples obeyed the order as needle-like (96.19 %) > hopper-like (81.59 %) > cubic-like (80.08 %) KCl samples. The mechanism was studied by surface area and related interaction tests. BET result demonstrated the highest surface area of needle-like structure than that of hopper-like and cubic-like structure. Besides, induction time combined with adhesion & desorption force tests further explained the better interaction of needle-like sample with bubble than cubic-like sample. While the special structure of hopper-like structure with lower weight but inner filled solution resulted in its near equivalent floatability with cubic-like sample. In conclusion, a new strategy for promoting flotation behavior by designing the crystallization of soluble KCl was proposed, shedding some light on further application on other soluble or semi-soluble minerals.
研究领域:
矿物加工工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Xiangwei Huang,Kai Liu,Bojun Shao,Lunchun Guo,Wugang Liao,Congwei Liao,Peng Yang
The growth of monolayer MoS2 via chemical vapor deposition typically necessitates high temperatures over 700 °C, which presents challenges for application in the integrated circuit industry where back-end-of-line processes require temperatures possibly below 500 °C. In this study, we demonstrate a method that combines potassium chloride mixed with a MoO3 precursor and perylene-3,4,9,10-tetracarboxylic acid tetra potassium salt as a seeding promoter for substrate pretreatment, which can effectively lower the growth temperature of MoS2 on sapphire and SiO2/Si substrates to 460 °C. The reduced growth temperature is achieved without compromising the material’s quality, making this method potentially transformative for the semiconductor industry. Our first-principles calculations and theoretical modeling accurately describe the observed morphological evolution of monolayer MoS2 crystals during growth. The crystal growth is governed by the probability of atom attachment to different edge types, which is determined by the varying formation energies of the nuclei at these edges. The grown monolayer MoS2 was characterized through atomic force microscopy, Raman and photoluminescence spectroscopy, and electrical transport measurements, confirming its high quality and suitability for electronic applications.
研究领域:
材料科学
·
半导体技术
·
理论计算
✓ 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）