BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Zepeng Liu,Yueyao Hu,Jie Zhang,Ying Guan,Liping Zhang,Ping Ye,Tongtong Zhang,Xingyu Huang,Meng Wang,Hui Gao
Adsorbents with excellent physicochemical properties and green synthetic routes are desired for efficient removal of Congo red (CR) wastewater. Hence, a novel approach was proposed within this work. Biochar NCBC obtained from Medulla Tetrapanacis was synthesized through co-modification with urea/calcium chloride. NCBC exhibited an enormous surface area (750.09 m 2 /g) and a micro-mesoporous composite structure. Higher nitrogen content was detected on the surface of NCBC (8.17%) compared to that of urea directly modified biochar (4.63%). Nitrogen observed on the surface of NCBC was presented as graphitic N, pyrrolic N, amine N as well as pyridinic N. Kinetic and isothermal investigations revealed the active sites on NCBC to be homogeneous and bind to CR mainly by chemisorption. Calculated maximum sorption of CR on NCBC was 2512.82 mg/g basing on Langmuir model. Moreover, the practicality of NCBC was further proved by the cultivation of Nelumbo nucifera Gaertn. and Penicillium .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Kai Zhang,Shuwei Chen,Zhaohui Guo,Yingxiong Wang,Yan Qiao
As a renewable resource, the catalytic conversion of xylose has attracted much attention. The epimerization of xylose to lyxose is an important way to obtain the rare sugar lyxose. Current approaches to xylose epimerization encounter several challenges, including the requirement for high temperatures, the use of costly catalysts and a propensity for side reactions that favor the formation of ketoses. CaCl 2 is an environmentally friendly and naturally abundant metal salt that can act as a Lewis acid in catalytic processes. Herein, we demonstrate that CaCl 2 and Et 3 N work synergistically to achieve 68 % lyxose yield under mild conditions. Compared to conventional approaches, which often require harsh conditions or expensive catalysts, our system demonstrates a cost-effective and selective strategy. Moreover, through a combined experimental and computational approach (NMR, isotope tracing and DFT), we provide unprecedented mechanistic insights into the role of calcium complexation in facilitating epimerization. Complexation between xylose and calcium ion was confirmed by NMR titration and Diffusion Ordered NMR Spectroscopy (DOSY-NMR). Isotope experiments further demonstrated that the C1-C2 migration caused the turnover of the hydroxyl group at C2 in the presence of calcium ions. The frontier orbital analysis and deprotonation energy calculation showed that the hydroxyl group at C1 had the lowest deprotonation energy, which initiated the ring-opening process. The DFT calculations reveal that the calcium ions preferentially complex with the hydroxyl groups of xylose, thereby reducing the energy barrier for the C1 proton dissociation and facilitating the epimerization. These findings offer a new perspective on xylose epimerization with Ca-based catalyst.
研究领域:
生物化学
·
催化化学
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Heng Zhang,Qinguo Ma,Wenji Su,He Hu
Although electroosmosis has been confirmed to be a promising technique for stabilizing soil with low permeability and high water content, several issues remain with this innovative method, including high power consumption, nonuniform strengthening effect, and electrode corrosion. In this context, for improving the feasibility of electroosmosis, a set of comparison laboratory tests were performed in customized apparatus to investigate the efficiency of intermittent current for the dewatering and consolidation of silty clay in the presence of calcium chloride. In this study, the time intervals of 0, 1, 2, 4, 8 h were, respectively, combined with 15% calcium chloride solution during the process of electric treatment. By comparison with conventional electroosmosis, the test results apparently indicated that intermittent current incorporated with calcium chloride not only increased the undrained shear strength of soil matrix, but also reduced the anode corrosion and power consumption induced by the injection of CaCl2 solution, which made the process economically feasible in practical projects.
研究领域:
土力学
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环境工程
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产品关联
DOI
PubMed
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.3
Haiyang Tian,Yunfeng Shi,Hongping Quan,Zhiyu Huang
The crosslinked polymer acid solution relies on a crosslinking agent to form a high-viscosity gel under the condition of weak hydrochloric acid concentration (pH value of about 2–4), and it is difficult to form a high-viscosity gel at high hydrochloric acid concentration. In this work, calcium chloride was investigated as a promoter to enhance the thickening and rheological ability of a self-thickening agent, at high temperature and high concentrations of hydrogen chloride. The results demonstrated that 10 wt.% of calcium chloride can greatly increase the viscosity of a self-thickening acid in the range of high concentration acid (15–10wt.% of hydrogen chloride), which is conducive to the early diversion of the acid solution and better realizes the deep acidification of low permeability formation. Thus, this study provides a novel perspective for developing new self-diverting agents.
研究领域:
石油工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Yaqi Ding,Neng Gao,Yongping Wu,Yongmei Xuan,Guangming Chen
Calcium chloride (CaCl2) aqueous solution as a liquid desiccant has the disadvantage of low vapor pressure and easy crystallization. Ionic liquids (ILs) such as [Emim]Cl, [Emim]Ac, and [Emim]Br have been verified to have a good ability to reduce the vapor pressure. In this paper, the vapor pressures of four kinds of CaCl2 + ILs + H2O were measured, which were CaCl2 + [Emim]Br + H2O (mass ratio CaCl2/[Emim]Br = 2:1) at temperatures of between 311.10 and 394.45 K, CaCl2 + [Emim]Cl + H2O (mass ratio CaCl2/[Emim]Cl = 2:1) at temperatures of between 306.58 and 393.89 K, CaCl2 + [Emim]Ac + H2O (mass ratio CaCl2/[Emim]Ac = 2:1) at temperatures of between 304.93 and 382.71 K, and CaCl2 + [Emim]NO3 + H2O (mass ratio CaCl2/[Emim]NO3 = 2:1) at temperatures of between 312.46 and 391.80 K, with the mass fraction of solute ranging from 0.2 to 0.5. The Antonie-type equation was used to fit the measured results. The average absolute relative deviation (AARD %) values of the measured vapor pressures and calculated vapor pressures were 0.52, 0.40, 0.33, and 0.27%, which showed good consistency and accuracy. Comparing the vapor pressures of the different solutions at the same concentration, the following order of the four anions with the ability to reduce the vapor pressure of CaCl2 + H2O can be drawn at a mass fraction of 0.4: Br– > Cl– > NO3– > Ac–.
研究领域:
化学工程
·
热力学
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Weisan Hua,Miaomiao Jiang,Xuelai Zhang,Qiang Sun,Wenzhuang Zhang
Calcium chloride hexahydrate (CCH) has a large latent heat of phase change, a high heat storage capacity and a relatively low cost, which makes it suitable for use in combination with the construction field. However, it has the problem of large supercooling, which limits its development and application. Studying the crystalline growth properties of calcium chloride hexahydrate is essential to comprehending or suppressing supercooling because the degree of supercooling is determined mainly by the room temperature(5–10 °C) melt structure of CCH and the structural factors that drive its supercooling behavior. Using a combination of macroscopic and microscopic research techniques, we explored the two features of the self-crystallization growth behavior of CCH at various initial concentrations and the crystallization growth behavior driven by the external addition of crystal nuclei were explored. The results showed that the water molecule content affects not only the product type but also the growth, development, and regrowth of crystals and crystal morphology. The observation of the triggered crystallization process under different nucleation types showed that the nucleation type affected the crystal growth, and SrCl 2 ·6H 2 O, which had a similar molecular structure, could replace the nucleation of CCH itself and accelerate the crystal growth process. At the same time, NaCl was more difficult to nucleate and inhibited crystal growth. To better understand subcooling and its inhibition, this paper examined the crystallization formation characteristics of CCH at various concentrations, compares and contrasts its crystallization characteristics under various nucleating agents as the triggering nuclei, and investigated the intrinsic mechanism of the nucleus type on its crystallization growth.
研究领域:
材料科学
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热能工程
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产品关联
DOI
高影响因子
JOURNAL OF WOOD CHEMISTRY AND TECHNOLOGY
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2024
·
IF 1.7
Yuan Fu,Huanbo Wang,Yue Liu,Jinpeng Li,XianZu Sun,Tian Liu
Wood with a porous structure is the best carrier for phase change energy storage materials, which can effectively prevent material leakage during thermal cycling and ensure its shaping effect. In this work, natural poplar wood was treated with delignification and then oxidized by TEMPO as a thermal energy storage matrix. Then, it was immersed in a solution of ethanol as the solvent, polyethylene glycol (PEG) and calcium chloride as the solutes, obtaining phase change energy storage ionic wood (DTW-PCMs). The results showed that the phase change energy storage material PEG-CaCl2 was successfully impregnated into the pore structure of wood; calcium chloride was effectively combined with –COOH in TEMPO oxidized wood for intermediate bonds and formed white complex crystals with PEG2000. The maximum absorption rate and differential scanning calorimetry (DSC) test results showed that TEMPO-oxidized poplar had a maximum absorption rate of 95.26% for PEG2000-CaCl2. Additionally, TEMPO-oxidized poplar exhibited good phase transition performance and suitable phase change temperature. The latent heat of phase transition was 86.96 J/g. Thus, the novel DTW-PCMs displayed a high potential application in the field of thermal energy storage and temperature regulation.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2019
·Vol. 55
·期 2
·601-609
·
IF 2.281
Yu Wang,Ying Zhou,Xi-xi Wang,Pei-jun Li,Bao-cai Xu,Cong-gui Chen
Summary The water holding capacity (WHC) of sodium-reduced (0.3 m sodium chloride, corresponding to the salt percentage (w/v) of 1.755%) myofibrillar protein (MP) gel in response to combined calcium chloride (CaCl 2 , 20, 60, 100 m m ) and high-pressure processing (HPP, 200 MPa, 10 min) was investigated. The results showed that 200 MPa + 20 m m CaCl 2 synergistically increased the WHC of MP gel via reducing particle size of MP solutions, strengthening hydrogen-bonding and disulphide-bonding, promoting formation of β-sheet and uncoiling of α-helix, exposing tryptophan residues, enhancing hydrophobic interactions of aliphatic residues and forming a compact and continuous networked gel structure. However, high concentrations (≥60 m m ) of CaCl 2 could attenuate the enhancing effects of HPP on the WHC by inducing decreased hydrogen bonds, fewer tryptophan residues exposed and coarser and aggregated gel structures with large cavities. Therefore, a combined moderate HPP and low concentration of CaCl 2 is a potential alternative for developing sodium-reduced meat products.
研究领域:
食品科学
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蛋白质化学
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肉类加工技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiangkun Bo,Kindness A. Uyanga,Lingyun Wang,Irum Firdous,Jihong Shi,Weilu Li,Jasim M. Almardi,Muhammad Fahim,Fei Liu,Huanlin Lyu,Walid A. Daoud
To meet the rising demand for wearable electronics with high power demand, biomechanical energy harvester based on stretchable materials with high triboelectric charge densities are required. Soy protein (SP) represents a prospective tribopositive material; however, its application is limited due to its brittle nature. Herein, we report the doping of SP with hygroscopic CaCl 2 to afford a tribolayer film with improved tribopositivity and stretchability, where Ca 2+ disperses evenly in SP via electrostatic interactions. The water molecules adsorbed by CaCl 2 form hydrogen bonds with SP chains and improve the charge-donating ability. The optimal SP–CaCl 2 -0.30 film with CaCl 2 -doping concentration of 0.30 mmol exhibits high resilience (elongation at break: 130 %) compared with the pristine SP film (elongation at break: 4 %). The device based on SP–CaCl 2 -0.30 as the positive tribolayer and Ecoflex as counterpart yields open circuit voltage, short circuit current , and short-circuit transferred charge of 130 V, 4.4 µA, and 44 nC, respectively. When the load resistance matches the device’s internal resistance, the peak transient power reaches 1125 mW/m 2 . Moreover, the device output is maintained even after 5000 of stretch and release cycles, and the harvested charge from the bending and release motions of the finger and elbow reach 3.5 nC and 40 nC, respectively. This study demonstrates a prospective approach toward protein-based energy harvesting with high stretchability and electrical output, showing significant potential for application in wearable electronics for biomechanical energy harvesting and relative humidity monitoring.
研究领域:
材料科学
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生物医学工程
·
能源技术
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产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 3
·1253-1266
·
IF 2.4
Huang Jingdong,Li Guangqiang,Yang Xiao
Natural Zn reserves might be exhausted in the following decades. Electric arc furnace (EAF) dust is an essential secondary Zn resource. The recovery of Zn from EAF dust is a critical factor in the sustainable development of the Zn industry and steelmaking industry. Efficient destruction of the ZnFe 2 O 4 crystal structure and separation of Zn and Fe are the key issues to recycle EAF dust. Molten metal chlorides are believed to be effective in breaking the structure of ZnFe 2 O 4 . This work clarifies the distinct reaction behavior between ZnFe 2 O 4 and MgCl 2 or CaCl 2 . Experiments show that although MgCl 2 is a more powerful chlorinating agent, the capability of separating Zn and Fe is not as good as that of CaCl 2 . Fast and selective chlorination of Zn from ZnFe 2 O 4 happens by reacting ZnFe 2 O 4 and MgCl 2 –CaCl 2 mixture. CaCl 2 facilitates the formation of stable Fe-bearing phases, such as MgFe 2 O 4 and Ca 2 Fe 2 O 5 , thereby inhibiting the chlorination of Fe. Moreover, it becomes more effective in promoting the selectivity of chlorinating Zn by increasing temperature after adding CaCl 2 in MgCl 2 . When ZnFe 2 O 4 is subjected to chlorination using a MgCl 2 –CaCl 2 mixture (MgCl 2 –CaCl 2 –ZnFe 2 O 4 molar ratio = 1.5:1.5:1) at 950 °C for 120 min, the process results in a chlorination percentage of over 90% for Zn, with Fe chlorination percentage lower than 5%. These results demonstrate the prospect of efficient separation of Zn from ZnFe 2 O 4 by reaction with molten MgCl 2 –CaCl 2 mixture. Graphical Abstract
研究领域:
冶金工程
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材料科学
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DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 16
·6297-6305
·
IF 9.8
Zhaohui Guo,Christian Marcus Pedersen,Honghong Chang,Yingxiong Wang,Yan Qiao
As a renewable source, fructose is of great significance in biomass conversion and food industries. Currently, most of the chemo-catalysts studied, with glucose as a substrate, are limited by the thermodynamic equilibrium of the reaction, resulting in the maximum yield of fructose of approximately 30–40%. The similar chemical structures and physical properties of monosaccharides bring another challenge for the separation of fructose from the reaction mixture. In this study, the combination of CaCl2 and Et3N was found to alter the thermodynamic equilibrium and promote fructose separation. The reaction parameters were optimized and up to 78% fructose yield could be obtained. The pathways of the isomerization reaction were found to involve both intramolecular hydride shift and an enediol intermediate mechanism, and the former was major. It could be speculated reasonably that Ca2+ played a key role in glucose conversion and interacted with glucose at its C1 and C2 positions, and Et3N interacted with Cl− while providing an alkaline environment. The formation of the α-fructofuranose’ complex, from Et3N, CaCl2 and α-fructofuranose, could shift the equilibrium of glucose isomerization towards fructose formation. According to the diffusion-ordered spectroscopy (DOSY) NMR results, the strong complexation slowed down the diffusion rate of the α-fructofuranose’ complex, allowing it to gradually precipitate, and hence drove the reaction equilibrium towards the desired fructose. The precipitate was filtered from the reaction mixture and processed further to obtain high-purity fructose in 45% isolated yield. Moreover, the filtrate containing solvent and reagents obtained in the separation process could be recycled.
研究领域:
生物化学
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食品科学
·
生物质转化
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Liwei Zhuang,Qinqin Hu,Shujing Wang,Ruyi Lin,Dan Li,Yong Ma,Lingzong Meng,Jiaoyu Peng
The solid–liquid phase equilibria of brine systems containing boric acid are the theoretical basis for the development of boric acid from brine resources. The phase equilibria of the systems NaCl–CaCl2–H3BO3–H2O and CaCl2–H3BO3–H2O at 323.15 K were investigated by the isothermal solution method. The phase diagram for the ternary system is composed of one co-saturation point, two univariant solubility curves, and two singe-salt crystallization fields of CaCl2·2H2O and H3BO3. The dry-salt phase diagram for the quaternary system consists of one invariant point, three univariant solubility curves, and three single-salt crystallization fields for NaCl, CaCl2·2H2O, and H3BO3. In the phase diagrams of the quaternary system at 298.15 and 323.15 K, the areas of sodium chloride and calcium chloride salt regions are enlarged, whereas the area of the H3BO3 region is diminished significantly with the increase of temperature. Using the Pitzer model, the lacking Pitzer parameters for H3BO3 were obtained by fitting the solubilities in the CaCl2–H3BO3–H2O system. The calculated solubilities with the Pitzer model were in accord with the experimental data.
研究领域:
化学热力学
·
无机化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）