BIORESOURCE TECHNOLOGY
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2026
·
IF 8.2
Mengjiao Fan,Maowen Qi,Yuxu Liu,Hongqin Ren,Yuchen Jiang,Baihong Li,Wenjian Liu,Shu Zhang,Yi Wang,Xun Hu
Convert K 2 CO 3 in filtrate in KOH by adding Ca(OH) 2 to simultaneously obtain CaCO 3 . • Superior cracking efficiency of KOH promotes the formation of micropores. • CaO as hard template facilitates generation of meso - and macropores, • Adding Ca(OH) 2 retains hollow honeycomblike structure in activated carbon (AC). • High mesoporosity and graphitic structure in AC determines tetracycline adsorption. Activation with K 2 C 2 O 4 generates K 2 CO 3 that could be recycled for second-round activation. However, activation with either K 2 C 2 O 4 or K 2 CO 3 produces activated carbon (AC) with mainly micropores. Herein, recycled K 2 CO 3 reacted with Ca(OH) 2 to generate KOH, CaO and CO 2 for activation of poplar, cellulose and lignin. The results indicated that K 2 CO 3 + Ca(OH) 2 showed superior cracking capability, generating AC from poplar with higher S BET (1822.1 versus 1179.4 m 2 /g with K 2 CO 3 or 1255.6 m 2 /g with K 2 C 2 O 4 ) and higher meso -porosity (43.3 % versus 10.0 % with recycled K 2 CO 3 and 3.1 % with K 2 C 2 O 4 ). This was due to strengthened activity for cracking with KOH and CaO, CO 2 for gasification, and CaO as a hard template. The in-situ DRIFTS characterization showed that K 2 CO 3 + Ca(OH) 2 interrupted dehydration of –OH, dehydrogenation of −C–H and even aromatization via cracking. The AC activated with Ca(OH) 2 /K 2 CO 3 showed the highest capability for tetracycline adsorption via monolayer mode, and membrane diffusion was the key rate-determining step. Download: Download high-res image (232KB) Download: Download full-size image
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Lihua Zhang,Yuli Ning,Yinjiao Wei,Yingying Xin,Bakht Ramin Shah,Hongtao Du,Jian Zou,Wei Xu
Konjac glucomannan (KGM) undergoes deacetylation in alkaline conditions, while κ-carrageenan (CRG) is sensitive to potassium ions. This study examines the influence of K 2 CO 3 on the mechanical properties of KGM/CRG-based camellia oil Pickering emulsion gels. Texture analysis and rheological testing revealed that the addition of K 2 CO 3 significantly enhanced the mechanical properties of emulsion gels. Texture parameters, such as the hardness, gumminess, and chewiness of the gel, were closer to those of pork back fat when the K 2 CO 3 concentration was 0.2 M. The addition of K 2 CO 3 enhance the intermolecular crosslinking within the gel and formed a more uniform and dense gel network, promoting gelation and structural stability, which were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and microstructural analysis. Besides, low-field nuclear magnetic resonance and thermogravimetric analyses indicated that the addition of K 2 CO 3 reduced the water mobility of the gel and improved its thermal stability. Physicochemical and color analysis results showed that the energy value of the camellia oil Pickering emulsion gel was only 15.9 % that of pork back fat, and its appearance was closer to that of pork back fat than hydrogels. This study provides technical support for the use of KGM/CRG-based camellia oil Pickering emulsion gels as fat analogs.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Guanqing Hu,Qingguo Zhang,Yongde Yan,Yun Xue,Fuqiu Ma,Yuelin Wang,Xin Liu,Jinlong Song
With the rapid development of the global nuclear industry, substantial amounts of radioactive tributyl phosphate (TBP) have accumulated during the PUREX process. Prolonged accumulation poses significant environmental risks. Therefore, this study proposes an efficient molten salt oxidation (MSO) method for the treatment of gelled TBP. Comprehensive thermal analysis data indicate that the oxidation process of gelled TBP primarily consists of three stages. The composition of the waste salts after the MSO process was analyzed using X-ray diffraction spectroscopy. Fourier transform infrared spectroscopy revealed that the primary functional groups in gelled TBP were progressively degraded with increasing temperature. Scanning electron microscopy clearly illustrated the decomposition process of gelled TBP. X-ray photoelectron spectroscopy results identified the predominant forms of residual substances. The generated exhaust gas was analyzed using gas mass spectrometry and chromatography. Additionally, through DFT calculations of TBP, the possible reaction mechanism of TBP in the molten salts was deduced. In the molten state, carbonate can effectively absorb P 2 O 5 and eventually form stable NaPO 3 , which is the reason for the 94.90 % retention rate of phosphorus element. During the experimental process, the degradation rate of gelled TBP reached as high as 99.99 %. The MSO method proposed in this study shows great potential for the treatment of liquid organic waste.
研究领域:
核化学与化工
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环境科学
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计算化学
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3391-3409
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IF 2.8
Jiang Shan,Wang Rui,Jin Changzi,Li Fei,Jiang Heng
The solid–liquid phase transfer catalyzed (S-L PTC) properties of polyethylene glycol (PEG) were investigated in the preparation of dialkyl disulfide (R 2 S 2 ) by oxidative coupling of alkyl mercaptan and sulfur with K 2 CO 3 as catalyst under atmospheric pressure and solvent-free conditions. The results have showed that the S-L PTC properties of PEG are not significantly different from those of crown ether. The S-L PTC properties of PEG are reduced due to methylation of the terminal hydroxyl groups, indicating that the terminal hydroxyl group in PEG plays an important role in stabilizing the [PEG-K 2 + CO 3 2− ] complex. The results of infrared spectral analysis confirm that CO 3 2− in K 2 CO 3 has a strong interaction with the terminal hydroxyl group in PEG. At the fixed molar ratio of –CH 2 CH 2 O-/K 2 CO 3 , the increase of PEG chain length has a positive correlation with the S-L PTC performance. The reaction rate and yield of R 2 S 2 can be improved by increasing the amount of K 2 CO 3 and the molar ratio of -CH 2 CH 2 O-/K 2 CO 3 appropriately. The PEG400/K 2 CO 3 system exhibits very high catalytic activity for the oxidative coupling reaction of alkyl mercaptan with sulfur as oxidant. The yield of the reaction product ( n -C 8 H 17 ) 2 S 2 can still reach more than 97% by using 0.1 mol% K 2 CO 3 and 0.006 mol% PEG400 (based on sulfur). Graphical Abstract
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Materials Today Chemistry
·
2022
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IF 7.613
Bin Jia,Qianghui Mian,Dongling Wu,Tao Wang
Biomass had been extensively explored and applied in many fields due to their abundance, attractive structure, low cost, renewability, and environmental friendliness. Cottonseed meal (CM), one of the by-products of cotton, consisted of much crude protein, fiber, and inorganic ions, was a potential carbon precursor. In this work, CM was used to prepare N, S, and O self-doped carbon materials by two steps (hydrothermal pre-carbonization and K 2 CO 3 carbonization–activation) processes. The optimized material displayed high capacitive performance, which benefited from the large surface area (2361 m 2 /g), hierarchical porous structure and rich multi-heteroatoms doping of the prepared porous carbon . What's more, we prepared a new-type K 2 CO 3 -based deep eutectic solvent (DES) electrolyte. The assembled symmetric device using DES electrolyte displayed a superior energy density (34.4 Wh/kg) at room temperature. Furthermore, the energy density could reach 36.5 Wh/kg when the temperature rose to 50 °C. Even under extreme conditions, the device delivered a not particularly bad energy density (11.8 Wh/kg at −25 °C and 8.6 Wh/kg at 105 °C). This study provided an efficient and simple method to prepare CM-based heteroatoms self-doped porous carbon materials and uncovered a new possibility for the exploitation of carbon-based supercapacitors with high energy density.
研究领域:
材料科学
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能源技术
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生物质利用
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Lijie Wang,Fei Sun,Fei Hao,Zhibin Qu,Jihui Gao,Mingjun Liu,Kunfang Wang,Guangbo Zhao,Yukun Qin
Aiming to enhancing porosity development and reducing the dosage of activation agents in preparation of activated carbon, a novel green and efficient strategy of trace K 2 CO 3 induced catalytic activation was proposed. In the design, adding small amount of K 2 CO 3 (less than 2% weight ratio of precursor) can significantly reduce the reaction barrier between coal framework and CO 2 molecules, thus enhancing pore formation of as-obtained activated carbons. The resulting Ca_AC-1 has short range ordered microcrystalline structure and developed pore structure, even superior to the activated carbon from chemical activation with large dosage of K 2 CO 3 (three times weight ratio of carbon precursor). Evaluated as CO 2 adsorbent, Ca_AC-1 a high CO 2 adsorption capacity and adsorption-regeneration cycling stability. More importantly, Ca_AC-1 with optimized pore and crystalline structure can deliver excellent supercapacitive performances in term of high energy and power densities (26–35 Wh/kg at 0.338–6.25 kW/kg in organic system) as well as 100% cycling stability. Both experiment and density functional theory (DFT) calculations demonstrate that C-O-K structure can be regenerated in CO 2 activation, leading to continuously catalytic effects despite low-dose K 2 CO 3 addition. Combining the low-cost sources, simple preparation procedures and good application performances, the resulting activated carbon holds great potentials for scalable production and applications. Such strategy can also be extented for developing high-performance activated carbons from various kinds of solid carbon sources.
研究领域:
材料科学
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能源存储
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环境科学
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化学工程
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碳材料
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2010
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IF 1.695
Xueqiao Xie,Juan Han,Yun Wang,Yongsheng Yan,Guowu Yin,Weisheng Guan
Experimental liquid−liquid equilibrium (LLE) binodal curves, tie-lines, and plait points were obtained for the PPG400 + salt (K3PO4, K2CO3, and K2HPO4) + H2O systems at T = 298.15 K. The Merchuk equation was used to correlate the binodal data of the investigated systems. Also, the effect of salt on the phase-forming ability has been studied based on the effective excluded volume (EEV) values from fitting the binodal data to the binodal model developed by Guan, and the salting-out abilities of the anions are in the order of PO43− > HPO42− > CO32−, which may be related to the Gibbs free energy of hydration of the ions (ΔhydG). Furthermore, tie-line compositions were correlated using the Setschenow-type, Othmer−Tobias, and Bancroft equations, and the parameters are reported.
研究领域:
化学
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生物学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2021
·Vol. 38
·期 4
·1065-1072
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IF 1.307
Yang Zhichen,Kang Xiaoting,Zou Bo,Yuan Xuna,Li Yajie,Wu Qin,Guo Yupeng
The massive discharge of biomass wastes not only causes waste of resources, but also pollutes the environment. Therefore, converting biomass wastes into carbon materials is an effective way to solve the above problems. Here, using biomass waste pig nails as raw materials and K 2 CO 3 as chemical activators, the N-doped porous carbon(KPNC) is prepared by direct pyrolysis. As an electrode for supercapacitors, the electrochemical tests of KPNCs showed that they exhibited good electrochemical performance and excellent cycling stability. When the current density is 0.2 A/g, the specific capacitance is up to 344.6 F/g. Moreover, it still maintains 97.6% initial capacitance retention after 2000 cycles at a high current density of 5 A/g. Above exceptional electrochemical performances may be ascribed to an appropriate porous structure( S micro / S total =80.31%, V micro / V total =76.19%), high nitrogen contents(4.44%, atomic fraction), oxygen contents(9.13%, atomic fraction) as well as small internal resistance. The above experimental results show that the conversion of pig nails to porous carbon can reduce the waste of resources and alleviate environmental pollution.
研究领域:
材料科学
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环境科学
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能源存储
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2015
·Vol. 162
·期 6
·E68
·
IF 3.266
Xinhua Cheng,Diyong Tang,Dingding Tang,Hua Zhu,Dihua Wang
Electrochemical splitting of Co3O4 into cobalt powder and oxygen was realized by electrolysis in molten Na2CO3-K2CO3 at 1023 K using a solid oxide pellet cathode and a Ni11Fe10Cu alloy inert anode. The electro-reduction mechanism of Co3O4 was investigated in details by cyclic voltammetry measurements and potentiostatic electrolysis in a three-electrode cell combining with the composition and morphology characterization of the electrolytic products. The electro-reduction of Co3O4 in Na2CO3-K2CO3 melt mainly involves two steps by electrochemical formation of intermediate product of CoO and then the CoO is reduced to cobalt metal. NaxCoO2 intermediate was not detected by XRD measurements and EDX analysis, different from the electro-reduction of Fe2O3 in this melt. However, the particle size and morphology of the intermediate CoO is found to be dependent of the applied potential in the range of −0.35 V to −0.75 V vs. Ag/Ag2SO4 reference electrode. Metallic cobalt powder was prepared by potentiostatic electrolysis at potential more negative than −1.25 V (vs. Ag/Ag2SO4) or by constant cell voltage electrolysis under a cell voltage higher than 1.7 V using a Ni11Fe10Cu inert anode. A high current efficiency of 95.3% and a low electrolysis energy consumption of 2.16 kW·h/kg-Co represents a novel high efficiency and green process for Co extraction. The Co product is a mixture of FCC and HCP structure, which is affected by the applied cell voltage and deserves further investigation to recognize the structure controllable condition and mechanism.
研究领域:
材料科学
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电化学
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冶金工程
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能源工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）