INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2011
·
IF 2.072
Juan Yang,Keqiang Qiu
Doehlert matrix was used to optimize the experimental conditions for the preparation of activated carbons from herb residues by vacuum chemical activation and traditional chemical activation using ZnCl2 as activation agent. The effects of activation temperature and impregnation ratio, the most influential factors of ZnCl2 chemical activation, were studied. The obtained activated carbons were characterized by total yield and methylene blue and iodine adsorption value. Each response has been described by a second-order model, and the predicted model presented a good agreement with experimental data. The results showed that activated carbons prepared by vacuum chemical activation have higher yield and better adsorption capacity. The removal percentages of methylene blue for the two optimal activated carbons and a commercial activated carbon were determined. The activated carbon prepared by vacuum chemical activation exhibited the highest methylene blue removal efficiency.
研究领域:
环境科学
·
材料科学
·
化学工程
·
资源循环利用
·
吸附技术
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Bojuan Hao,Kaige Wang,Yukun Zhou,Chaofan Sui,Lei Wang,Ren Bai,Zhaojin Yang
DNA molecular compaction/decompaction is of great significance for the exploration of basic life processes, the research of biomedical and genetic engineering, and so forth. However, the detailed mechanism of DNA compaction/decompaction caused by surfactants remains an open and challenging problem that has not been fully solved so far. In this paper, a sort of novel solid substrate, nanoPAA-ZnCl2-AuLs, with good stability and high sensitivity, was prepared by a self-assembly method. Based on this substrate, the surface-enhanced Raman scattering (SERS) technology was employed to investigate characteristics of interactions between DNA molecules and surfactants at a single molecular level. SERS spectra of calf thymus DNA (ctDNA), cetyl trimethyl ammonium bromide (CTAB), and sodium dodecyl sulfate (SDS) with a concentration as low as 10–9 M, and SERS spectra of ctDNA–CTAB and ctDNA–CTAB–SDS composites were collected, respectively. The interactions between ctDNA and surfactants were analyzed by changes in SERS spectra, for example, disappearances and appearances of SERS bands and relative changes of peak intensity, in which CTAB resulted in the compaction of the DNA molecule while SDS induced the decompaction of the ctDNA–CTAB complex. Moreover, UV–visible spectrophotometry was employed to demonstrate the compaction/decompaction of ctDNA molecules caused by surfactants. The local binding modes of ctDNA molecules and surfactant molecules were expounded. This work will be helpful for understanding biological processes such as DNA compaction and recombination within nucleus or/and cells and for the development of gene therapy technologies.
研究领域:
生物物理学
·
分子生物学
·
基因治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Wenyan Zhou,Jianbo Gan,Haiwen Li,Cunde Wang
A three-component reaction of 2-amino-4H-chromen-4-ones, aromatic aldehydes, and 4,4-dialkoxycyclohexa-2,5-dien-1-ones for the concise synthesis of chromeno[2,3-c]dihydroisoquinoline derivatives has been investigated. This reaction involved consecutive ZnCl2-promoted Micheal addition and intramolecular Friedel–Crafts alkylation. This synthetic protocol offered several advantages, including the readily accessible starting materials, good functional group tolerance, and simplicity of operation. Additionally, the structures of products obtained were determined based on X-ray diffraction studies.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Haitao Zhang,Hailong Kang,Shuang Ma,Qirong Yang,Youping Li,Chenxuan Yan,Xinsong Wang,Yong Dong
Composite chloride salts have become molten salt heat storage materials with high development potential due to their excellent heat storage performance. Since chloride salts are prone to leakage, they need to be adsorbed onto porous materials to prepare composite phase change materials (CPCMs). Changes in the pore size of porous materials will lead to changes in the scale of chloride salts. Currently, there is little research on the impact of scale variation on the thermophysical and phase change characteristics of composite chloride salts, and the underlying mechanisms are not yet clear. With the ZnCl 2 -NaCl-KCl (3:1:1 mol%) eutectic salt as the phase change material (PCM), this study integrates molecular dynamics (MD) simulation with an experimental approach to investigate the impact of scale on the thermophysical properties and phase change properties of CPCM. The inherent influence mechanism of scale effect is analyzed from a microscopic perspective. The results indicate that as the scale increases, the interaction energy between molecules within the system gradually increases, and the system structure becomes more compact. The thermal conductivity first increases and then decreases, reaching a maximum of 0.45 W/(m·K) at 8 nm; the volumetric thermal expansion coefficient gradually decreases. As the scale increases from 3 nm to 15 nm, the melting temperature rises by 8.1 %, while the solidification temperature decreases by 1.73 %, resulting in a significant increase in the degree of supercooling. The latent heat gradually increases with scale, which is consistent with the coordination number.
CAS / MDL:
研究领域:
材料科学
·
热能工程
·
储能技术
·
分子动力学模拟
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lianshi Qu,Zhihao Zhao,Zhenyuan Li,Rao Zhang
MXene is a novel two-dimensional nano material with exceptional performance, which can be applied in the fields of energy storage structural materials, optics, catalysis, and sensors etc. However, its synthesis is a challenge to date. From the perspective of environmental friendliness, the method of Lewis salt etching can effectively avoid the use of dangerous reagents and has been seen as a pollution-free economic approach. In this article ZnCl 2 molten salt was chosen as corrosive agent to etch Ti 3 AlC 2 MAX phase and investigated the synthesis mechanism of Ti 3 C 2 Cl x MXene. The influence of main process factor, like raw materials, sintering temperature , and holding time on synthesis product were studied and discussed. The synthesis route was investigated by XRD and thermal analysis. SEM and TEM technology was used to analyze the microstructure and lattice of synthesis product. The results showed that the optimal process conditions: the molar ratio of raw materials was 1:6 (Ti 3 AlC 2 : ZnCl 2 ), the synthesis temperature and holding time were 600～700 °C and 4 h, respectively. Ti 3 C 2 Cl x MXene material prepared by this method has a complete layered structure and uniform composition, and its synthesis mechanism can be concluded to two steps: the first step was the reaction between Ti 3 AlC 2 MAX phase and ZnCl 2 to generate Ti 3 ZnC 2 MAX phase; In the second step, the Ti 3 ZnC 2 MAX phase reacted with the remaining ZnCl 2 to generate Ti 3 C 2 Cl x MXene material.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2013
·
IF 4.75
Shuai Leng,Xinde Wang,Qiuxia Cai,Fengyun Ma,Yue’e Liu,Jianguo Wang
Direct biomass conversion into chemicals remains a great challenge because of the complexity of the compounds; hence, this process has attracted less attention than conversion into fuel. In this study, we propose a simple one-step method for converting bagasse into furfural (FF) and acetic acid (AC). In this method, bagasse pyrolysis over ZnCl 2 /HZSM-5 achieved a high FF and AC yield (58.10%) and a 1.01 FF/AC ratio, but a very low yield of medium-boiling point components. However, bagasse pyrolysis using HZSM-5 alone or ZnCl 2 alone still remained large amounts of medium-boiling point components or high-boiling point components. The synergistic effect of HZSM-5 and ZnCl 2 , which combines pyrolysis, zeolite cracking, and Lewis acid-selective catalysis results in highly efficient bagasse conversion into FF and AC. Therefore, our study provides a novel, simple method for directly converting biomass into high-yield useful chemical.
研究领域:
能源化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2023
·Vol. 29
·期 7
·2947-2958
·
IF 2.8
Guan Pingping,Li Haobo,Zhang Xin,Shi Zhongning,Liu Aimin
Zinc is a commonly used corrosion-resistant coating for steel surface protection. In this study, the ethylene carbonate-zinc chloride (EC-ZnCl 2 ) electrolyte systems are selected for zinc electrodeposition, and their ionic structure and properties were studied. The corrosion resistance of the electrodeposited zinc coatings obtained from 4EC-ZnCl 2 , 3EC-ZnCl 2 , and 2EC-ZnCl 2 systems was analyzed. Raman spectroscopic analysis shows that these EC-ZnCl 2 systems contain [Zn 2 Cl 6 ] 2− species. The relationship between conductivity, viscosity, and density with the temperature of EC-ZnCl 2 systems was provided. Scanning electron microscopy (SEM) and potentiodynamic polarization curve (Tafel) tests showed that when the deposition was carried out at –1.0 V and –1.2 V (vs. Ag/AgCl) for two hours, a uniform zinc coating with good corrosion resistance could be obtained.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Linghui Kong,Yuewen Shao,Runxing Sun,Shu Zhang,Yi Wang,Jun Xiang,Song Hu,Dong Wang,Chuanjun Leng,Xun Hu
Bio-oil contains abundant aliphatic organics, which can be used to impregnate a biomass feedstock for increasing aliphatic content, as aliphatics are important for pore development in activation. Herein, impregnation of homologous bio-oil to spring jasmine wood (SJW) and further activation of the impregnated sample (SJW-oil) with ZnCl 2 or K 2 C 2 O 4 were conducted, aiming to explore another alternative outlet for application of bio-oil. The results showed that the impregnated bio-oil increased yield of activated carbon (AC) by 29.9 % (on SJW basis) in activation with ZnCl 2 , due to promoted condensation of organics from the impregnated bio-oil. Nevertheless, the specific surface area was reduced from 2098.5 m 2 g −1 in activation of SJW only to 1602.1 m 2 g −1 from SJW-oil, as the impregnated bio-oil suppressed infiltration of ZnCl 2 to internal structures of SJW. However, more mesopores were generated in AC-Oil-ZnCl 2 (85.9 %) than in AC-ZnCl 2 (92.5 %), originating from activation of organics in impregnated bio-oil. K 2 C 2 O 4 could easily crack organics in the impregnated bio-oil and in SJW, increasing specific surface area from 1152.2 m 2 g −1 in AC-K 2 C 2 O 4 to 1283.4 m 2 g −1 in AC-Oil-K 2 C 2 O 4 . In-situ IR characterization showed formation of additional aliphatic structures from the impregnated bio-oil and also intensified cracking reactions, favoring pore developing but diminishing AC production. The impregnated bio-oil also rendered the AC with superior performance for phenol adsorption but lowered environmental impact of the activation process.
研究领域:
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuxiang Chen,Hou-Yong Yu,Yingzhan Li
Cellulose dissolution is a worldwide issue in the production industry. Especially, the development of highly efficient and green cellulose solvents has been considered as a key factor to restrict the broad application of different cellulose industries. In this study, different chloride salts, such as LiCl, ZnCl2, CaCl2, and FeCl3, with different water amounts were used as green solvents to investigate the driving force of cellulose dissolution. The superfast and highly efficient cellulose dissolution in ZnCl2·3H2O and FeCl3·6H2O was successfully achieved within 5–20 min, which was confirmed by the results of polarized light microscopy. Moreover, the effect of pH and water amounts of the chloride salts on the cellulose structural change and dissolution ability was investigated for a better understanding of the role of chloride salts during the cellulose dissolution process. Especially, the dissolution mechanism of cellulose in ZnCl2·3H2O and FeCl3·6H2O has been provided compared to other non-derivatizing cellulose solvents.
研究领域:
化学工程
·
材料科学
·
生物质技术
✓ 已验证
产品关联
DOI
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Xuan Wang,Yaoxing Wang,Xueqi Li,Jian Li,Yanjun Xie,Daxin Liang,Wentao Gan
Utilizing abundantly available biomass materials to prepare adsorbent substances is a simple and cost-effective method for CO 2 adsorption, which, however, is often hampered by low adsorption capacity. Here, we demonstrate near-spherical active carbon (C-DWP/Zn) with high CO 2 adsorption ability, employing delignification combination with ZnCl 2 activation of natural wood powder. Removing lignin from wood cell walls facilitates easy absorption of Zn ions by the cellulose nanofibers (CNFs), thereby promoting micro/nano pores formation. Moreover, rapid dehydration of cellulose molecular chains alters the morphology of activated carbon, resulting in a transition from a granular to a near-spherical shape. Consequently, C-DWP/Zn with high specific surface area of 1769 m 2 g −1 , shows a significantly higher microporous volume than that of a control sample without delignification. The CO 2 adsorption capacity of C-DWP/Zn, with values of 3.51 mmol g −1 and 5.12 mmol g −1 at 1 bar, 25 °C and 0 °C, respectively, is superior to that of commercial activated carbon. Attributable to its optimal micropore structure, C-DWP/Zn exhibits high CO 2 /N 2 selectivity. Furthermore, the high carbon dioxide adsorption efficiency of C-DWP/Zn was maintained and the substance could be reused at least 20 times. Near-spherical active carbon adsorbents prepared from low-value wood powders, all featuring high CO 2 adsorption performances, reasonable CO 2 /N 2 selectivity, good recoverability, suitable heat of adsorption, and fast adsorption kinetics, which are promising candidates for practical CO 2 adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
ELECTROCHEMISTRY
·
2022
·Vol. 90
·期 2
·027006-027006
·
IF 1.777
Aimin LIU,Mengxia GUO,Yubao LIU,Fengguo LIU,Xianwei HU,Zhongning SHI
In this work, the Zn–Ta coating was electrodeposited from DMI–ZnCl2–TaCl5 solvate ionic liquid. The electrochemical reaction was studied by cyclic voltammetry using titanium as working electrode. The onset potential of zinc and tantalum co-deposition was −0.7 V (vs. Ag). Moreover, potentiostatic electrodeposition experiments were conducted to investigate the influence of potential and temperature on the morphology of the coating. X-ray photoelectron spectroscopy analysis confirmed that the coating obtained by electrodeposition at −1.6 V (vs. Ag) and 353 K was composed of Zn, Ta, ZnO, and Ta2O5. The mass fraction of element tantalum was 6.21 %, and metallic tantalum accounted for 11.54 % of the mass of element tantalum. The corrosion current density of the Zn–Ta coating was 1.83 × 10−4 A cm−2.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 8
·1-11
·
IF 2.8
Li Jie,Wu Pengfei,Li Liang,Cheng Qiannan,Wang Luoxin,Wang Hua,Tang Qingquan
Polyphenylene sulfide (PPS) is a commonly utilized engineering polymer that produces significant waste annually. However, comprehensive studies on its recycling and repurposing remain somewhat scarce. Herein, the waste PPS is calcinated by a “controlled carbonization” strategy based on ZnCl 2 catalyst to produce hierarchically porous carbons, showing potential in generating freshwater depending on solar-thermal-vapor conversion. The two-step carbonization process was optimized, and the optimal carbonization temperatures were found to be 400 ℃ and 750 ℃, respectively. The resultant hierarchically porous carbons were utilized to prepare solar steam evaporators, showing a high evaporation rate of 1.68 kg/m 2 /h with the energy conversion efficiency of 92.16% under 1 sun irradiation. The research offers a facile strategy for converting low-cost waste PPS into valuable hierarchically porous carbons, meanwhile, it provides a feasible solution for using them to produce freshwater through solar energy.
研究领域:
材料科学
·
环境工程
·
能量转换
·
高分子回收
·
太阳能利用
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）