Chemical Engineering Journal Advances
·
2023
·
IF 0
Mengsi Cheng,Ying Fang,Zhaoguang Yang,Xinghao Liu,Bo Qiu,Tong Zhang,Haipu Li,Wenbo Zhao
MIL-100(Fe) was modified by amino groups (MIL - 100(Fe) - NH 2 ) to enhance the removal of antimonate (Sb(V)) with low concentration (50−200 μg/L) from natural water through batch adsorption experiments. With the initial Sb(V) concentration up to 200 μg/L, the residual Sb(V) concentration after treated by MIL - 100(Fe) - NH 2 was only 3.52 ± 0.131 μg/L, lower than the drinking water standards (5 μg/L) in China, while that was much higher (94.2 ± 3.52 μg/L) after pristine MIL-100(Fe) treatment. Based on results of XPS analysis, and adsorption kinetics and isotherms, we concluded that Sb(V) substituted the terminal −OH groups of MIL-100(Fe) to form inner-sphere complexes by coordination reactions with Fe nodes and be adsorbed by hydrogen bonding as well. The grafted amino groups (−NH 2 ) adsorbed Sb(V) by hydrogen bonding and facilitated the coordination reactions between Sb(V) and Fe nodes. The higher K L value (0.0116 ± 0.00,118 L/μg) obtained by fitting with the Langmuir isotherm model, while that of unmodified MIL-100(Fe) was 4.74 × 10 −4 ± 5.85 × 10 −5 L/μg, also confirmed that the −NH 2 groups greatly enhanced the affinity between MIL-100(Fe) and Sb(V). Furthermore, MIL - 100(Fe) - NH 2 still worked nicely in a wide pH range (2 − 12), with varied ionic strength (0.05 µmol/ L −1.5 mol/L), coexisting ions (CO 3 2− , NO 3 − , SO 4 2− , Cl − , H 2 PO 4 − ), and even in the real water bodies. Additionally, MIL - 100(Fe) - NH 2 exhibited good reusability and low Fe leaching (99.92 μg/L). We hope MIL - 100(Fe) - NH 2 become a candidate for effective removal of Sb(V), even other heavy metals from natural waterbodies.
研究领域:
环境科学
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材料科学
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DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 11
·11126-11139
·
IF 2.914
Li Zhenyuan,Pan Zhidong,Wang Yanmin
A raw illite-smectite mixed-layered clay (RI/S) was ground for preparing nano-sized I/S clay (NI/S) and subsequently amino-functionalized via grafting of 3-aminopropyltrithoxysilane (APTES) (NH 2 -RI/S and NH 2 -NI/S, respectively). The samples were characterized by particle size analysis, specific surface area measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and 29 Si nuclear magnetic resonance ( 29 Si NMR). Compared to RI/S, NI/S has a narrow particle size distribution and appears in a platelet-like morphology due to the disintegration/exfoliation of RI/S after grinding. Based on the 29 Si NMR spectra, the appearances of tri-silicate units indicate the chemically grafting of APTES molecules on NH 2 -RI/S and NH 2 -NI/S, respectively. NH 2 -NI/S can adsorb greater amounts of Pb(II) cations and Cr(VI) anions rather than NH 2 -RI/S since NH 2 -NI/S grafts more amounts of amine groups (-NH 2 ). The isotherm data for adsorption of Pb(II) cations and Cr(VI) anions can be described by the Langmuir model at different temperatures (i.e., 10 °C, 30 °C, and 50 °C), respectively. The maximum adsorption amounts of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S calculated by the Langmuir isotherm model are 131.23 mg/g and 36.91 mg/g at 50 °C, respectively. The adsorptions of Pb(II) cations and Cr(VI) anions onto NH 2 -NI/S involve in the surface complexation of NI/S and amine groups.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jianbo Wan,Ruiqing Wu,Yiyi Chen,Hao Zhang,Huafeng Li,Bohai Wang,Tomasz Liskiewicz,Shengwei Shi
MXenes show great potential in energy storage due to their excellent conductivity, abundant surface groups and adjustable interlayer spacing. Amino modification is an effective strategy to improve electrochemical properties of MXene. However, the selection of amino source is still a key issue. Herein, the amino modification of Ti 3 C 2 MXenes for high-performance supercapacitors has been investigated. The structure and electrochemical properties of Ti 3 C 2 are modified by different amino sources, such as ethylenediamine (EDA), monoethanolamine (MEA) and hydrazine monohydrate (HM). EDA ensures Ti 3 C 2 the largest interlayer spacing (13.96 Å) and highest specific surface area (52.2 m 2 g −1 ). In addition, there are more functional groups in EDA-modified Ti 3 C 2 (EDA-Ti 3 C 2 ) resulted from the stronger electron-donating nature of EDA than HM and MEA. Thus, EDA-Ti 3 C 2 exhibits the largest specific capacitance of 683 F g −1 in 1 M H 2 SO 4 electrolyte at 2 mV/s, and the capacitance maintains 97.3 % of the original after 10,000 cycles at 50 mV/s. As a comparison, MEA-Ti 3 C 2 and HM-Ti 3 C 2 show specific capacitances of 553 F g −1 and 470 F g −1 , respectively. Furthermore, the symmetric supercapacitor based on EDA-Ti 3 C 2 electrode achieves maximum energy density of 7.87 W h kg −1 at power density of 600 W Kg −1 , and the energy density still remains at 6.34 W h Kg −1 even at an increased power density of 3000 W Kg −1 . This study proposes a simple strategy to enhance electrochemical properties of MXene by amino modification, providing valuable insights for high-performance supercapacitors.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 5
·2773-2782
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IF 9.3
Tingting Chu,Xiaoxu Yang,Mingjie Chen,Qing-Shan Shi,Xiaobao Xie,Yanzhu Guo
The conversion of lignin into carbon dots is an emerging technology to make use of this renewable and abundant material. The low yield and low quantum yield of carbon dots from lignin remain key challenges of this technique. Here, prior amino modification of lignin using the Mannich reaction was proposed to improve carbon dot production from lignin by the hydrothermal method. Accordingly, the yield and quantum yield of carbon dots were synchronously improved from 9.8 wt% and 5.36% to 68 wt% and to 42.7%, respectively, because modified lignin suppresses hydrochar formation. A survey of the impact of the lignin structure on carbon dot production, and the structure and property relationship of the as-prepared carbon dots showed that the process could make use of condensed lignin to produce carbon dots with high performance. Techno-economic analysis suggested that this process noticeably reduced the product selling price because of the improved yield. This study provides a strategy to reduce the production cost of carbon dots from lignin, which may inspire the community to extract money out of lignin.
研究领域:
生物质化学
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材料科学
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可再生能源
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DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 5
·1257-1267
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IF 3.146
Cheng Liang,Zhang Li,Wang Hongxia,Song Fangxiang
Mesoporous silica (MS) and graphene oxide (GO) are good absorbents. Combining them not only prevents GO agglomeration but increases the number of MS active sites. In addition, their composites can preferentially adsorb specific pollutants after modification. In this work, amino-modified GO/MS materials were prepared by post-grafting to remove Congo red (CR) and Cr(VI) in solution. Characterization methods, such as X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Zeta potential, and N 2 adsorption/desorption, were adopted. The prepared GO/MS@HBP has a porous structure with a specific surface area of 49.32 m 2 ·g −1 . The effect of initial concentration, pH, adsorption time, temperature and other ions was determined on the adsorption amount. Relying on this, the GO/MS@HBP maximum capacity for Cr(VI) and CR adsorption are 93.73±2.3% and 257.69+1.5% mg·g −1 , respectively. Pseudo-second-order kinetic and Langmuir isotherms are more suitable to describe the adsorption process, indicating that chemical adsorption plays a major role in the entire adsorption process. Thermodynamics showed that the enthalpy (H) of materials adsorbing two pollutants was positive and that the Gibbs free energy (G) was negative, suggesting that Cr(VI) and CR adsorption on GO/MS@HBP was spontaneously endothermic. GO/MS@HBP could simultaneously remove CR and Cr(VI) in solution, and be an effective adsorbent for removing harmful substances.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 38
·16776-16794
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IF 2.7
Jianwei Zhang,Chengming Bian,Ling Chen,Weidong He
Recently, we investigated the interaction mechanism of 1H-tetrazole (1H-TZ) and nitrocellulose (NC). Next, we tried to introduce an amino group at the C and N atoms of 1H-tetrazole, so as to explore the influence of amino group modification on the pyrolysis process of NC. The focus of this study was on investigating the interaction mechanism of aminotetrazole (5-ATZ or DATZ) and NC through kinetics methods and TG-DSC-FTIR analysis. The quenching and reheating experiments revealed that the imino form of 5-ATZ or DATZ played an important role in this process. The addition of aminotetrazole (5-ATZ and DATZ) mainly affected the autocatalytic reaction at the initial stage of the pyrolysis process of NC. TG-DSC-FTIR experiments revealed that there was a chemical reaction between NO2 and decomposition products of 5-ATZ or DATZ. In this reaction, R–NCNH or NC–NH–R (R = H and NH2) reacted with NO2 to form N2O and CO2.
研究领域:
化学动力学
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材料科学
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热分析
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产品关联
DOI
高影响因子
ChemCatChem
·
2025
·
IF 3.9
Dancheng Zhu,Yuchen Cao,Yuchen Qian,Weijie Yu,Yuxuan Xu,Hao Xu,Jun Qiao,Chao Shen,Jiabin Shen
Graphical This study develops amino-modified Ti 3 C 2 /Mg 3 Al-LDH composites as solid base catalysts for aldol reactions. The composite reduces surface agglomeration, enhances active site exposure, and increases basicity, achieving 99% product yield under optimized conditions (60 °C, 30 min). It retains > 91% efficiency over five cycles, demonstrating superior stability and catalytic performance compared to non-modified LDHs. Aldol reaction is an important class of industrially catalyzed reactions for synthesizing high-value fine chemicals. Traditionally conducted under alkaline conditions, these reactions often utilize liquid alkali catalysts, which present challenges such as difficult separation and recovery and undesirable side reactions promoted by the catalyst. Solid base catalysts have received much attention and research in recent years to address these issues. In this study, magnesium–aluminum layered double hydroxides (MgAl-LDHs) were synthesized using magnesium chloride hexahydrate, aluminum chloride hexahydrate, and anhydrous sodium carbonate. These were subsequently combined with amino-modified Ti 3 C 2 to form composite materials. Characterization of the prepared Mg 3 Al-LDH/Ti 3 C 2 -NH 2 composites was conducted using X-ray diffractometer (XRD), scanning electron microscope (SEM), infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) confirming the successful preparation of the composite material. The prepared Mg 3 Al-LDH/Ti 3 C 2 -NH 2 was applied as a catalyst in the aldol condensation reaction. Key factors such as catalyst dosage, reaction time, acetone amount, and temperature were investigated to optimize catalytic efficiency. Under optimal conditions—100 mg Mg 3 Al-LDH/Ti 3 C 2 -NH 2 , a reaction time of 0.5 h, 200 mg of p -nitrobenzaldehyde, 1 mL of acetone, and a reaction temperature of 60 °C—a yield of 99% was achieved. The result demonstrates that Mg 3 Al-LDH/Ti 3 C 2 -NH 2 exhibits excellent catalytic activity and holds promising potential for application in solid base catalysis.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Tong Liu,Yu Liu,Yuwei Ye,Jingyu Li,Feng Yang,Haichao Zhao,Liping Wang
In this study, a self-healing epoxy coating containing tetraaniline modified α-Fe 2 O 3 (TAFe) was prepared for corrosion protection of Q235 steel. The TAFe particles were synthesized using bio-inspired catechol chemistry and the evaluation of the corrosion resistant benefits of TAFe as additive in the epoxy coating were conducted. The time-dependent corrosion protective ability of the epoxy composite coating containing TAFe applied on Q235 carbon steel were characterized by electrochemical techniques such as EIS and LEIM. Characterization of corrosion layer was done by SEM and XRD after removing coatings after 70 days of immersion in 3.5 wt% NaCl solution. Findings of corrosion measurements confirmed the existence of a small amount TAFe (0.7 wt%) resulted in improvement of corrosion protective properties of steel during corrosion process compared with neat epoxy coating and the coating with 0.7 wt% non-modified Fe 2 O 3 . Moreover, surface techniques showed compact passivated iron oxide layer beneath the coatings and presence of different metallic oxide phases for coatings. The corrosion protective enhancement of composite coating could be ascribed to electroactive function of tetraaniline layer on α-Fe 2 O 3 .
研究领域:
材料科学
·
腐蚀与防护
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Jing Li,Qingxiang Zhou,Miao Li,Yongli Liu,Qinan Song
Nitroaromatic explosives are major pollutants produced during wars that cause serious environmental and health problems. The removal of a typical nitroaromatic explosive, 2,4,6-trinitrotoluene (TNT), from aqueous solution, was conducted using a new recyclable magnetic nano-adsorbent (Fe@SiO 2 NH 2 ). This adsorbent was prepared by grafting amino groups onto Fe@SiO 2 particles with a well-defined core-shell structure and demonstrated monodispersity in solution. The removal performance of the nano-adsorbent towards TNT was found to be 2.57 and 4.92 times higher than that towards two analogous explosives, 2,4-dinitrotoluene (2,4-DNT) and 2-nitrotoluene (2-NT), respectively, under neutral conditions. The difference in the removal performance among the three compounds was further compared in terms of the effects of different conditions (pH value, ionic strength, humic acid concentration, adsorbent modification degree and dosage, etc.) and the electrostatic potential distributions of the three compounds. The most significant elevation is owing to modification of amino on Fe@SiO 2 which made a 20.7% increase in adsorption efficiency of TNT. The experimental data were well fit by the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model, indicating multilayer adsorption on a heterogeneous surface. The experimental results and theoretical considerations show that the interactions between Fe@SiO 2 NH 2 NPs and TNT correspond to dipole-dipole and hydrophobic interactions. These interactions should be considered in the design of an adsorbent. Furthermore, the adaptability to aqueous environment and excellent regeneration capacity of Fe@SiO 2 NH 2 NPs makes these remediation materials promising for applications.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Xingyu He,Xiaobo Min,Xubiao Luo
The adsorption performance of the amino modification of zirconium metal–organic framework (UiO-66(NH2)) for the removal of antimony (Sb) from aqueous solution has been investigated. The influence of equilibrium concentration, solution pH, temperature, and contact time on the Sb adsorption were investigated by the batch method. Compared with original UiO-66, the UiO-66(NH2) adsorption capacity for Sb(III) and Sb(V) increased to 61.8 mg/g and 105.4 mg/g for Sb(III) and Sb(V), although the surface area of UiO-66(NH2) decreased from 486.31 m2/g to 113.46 m2/g. The adsorption equilibrium data of Sb on UiO-66(NH2) fitted well with the Langmuir adsorption model, and the kinetics data fitted well with the second-order adsorption model. Thermodynamic parameters indicated that adsorption processes of Sb were feasible, endothermic, and spontaneous. The adsorption isotherm parameters indicated that the Sb adsorption data fitted well with the Langmuir model. The mean adsorption energy obtained from the Dubinin–Radushkevich (D–R) isotherm model further revealed that the Sb adsorption process was chemisorption. Additionally, FTIR analysis and X-ray photoelectron spectroscopy (XPS) study revealed that the Zr–O bond and amino group played a significant role in the Sb removal. Thus, UiO-66(NH2) is a promising candidate for Sb contaminated water remediation on the basis of low-cost, easy availability, high Sb adsorption capacity, nontoxicity, and high stability.
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
高影响因子
BIOORGANIC CHEMISTRY
·
2020
·
IF 4.831
Sheng Zhang,Niping Feng,Jinwen Huang,Minglong Wang,Lei Zhang,Junjie Yu,Xiling Dai,Jianguo Cao,Guozheng Huang
Aleuritopteris argentea (S. G. Gmél.) Fée is a medicinal fern consisting of an ent -labdane diterpene, i.e. alepterolic aicd, as the major metabolite. We recently isolated grams of alepterolic acid from A. argentea enabling subsequent structural modification. By incorporation of amino moiety to alepterolic acid, fifteen amide derivatives were synthesized, characterized, and further biological evaluated regarding their activity against four cancer cells and normal human liver cells. The potency of synthesized amides dramatically improved as compared to alepterolic aicd itself. The best hit (compound 11 ) inhibits HeLa cells with an IC 50 of 7.39 ± 0.80 μM, and is nearly nontoxic to normal cells. Compound 11 exhibits an inhibitory effect on the colony forming ability of the four cancer cells, especially of HeLa cells. Moreover, it induces apoptosis of HeLa cells by decreasing mitochondrial membrane potential and altering expression of apoptosis-associated proteins. Release of cytochrome c , activation of caspases-3, caspases-9 and alteration of Bax/Bcl-2 balance was detected in the biological assays. These results imply that compound 11 can inhibit the proliferation of cervical cancer cell line HeLa and induce apoptosis through the mitochondrial pathway. These findings encourage further rational structural modification of 15- carboxyl group of alepterolic acid.
研究领域:
药理学
·
肿瘤学
·
有机合成化学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Jinglei Cui,Dan Ren,Jingjing Tan,Huirong Zhang,Yanxia Guo,Long Huang
Toluene is one of the typical volatile organic compounds in industry, particularly in energy and fuels production processes, which is required to be eliminated effectively to protect the environment. Catalytic oxidation of toluene is widely studied for its high efficiency, and rational design and synthesis of metal catalysts are keys for toluene oxidation. In this study, an efficient catalyst was designed and synthesized by introducing −NH2 groups on the ordered mesoporous silica (KIT-6) surface to anchor and disperse Pd species, leading to Pd nanoparticles being highly dispersed with uniform particle size distribution. Meanwhile, it was found that the introduction of −NH2 made Pd centers present an electron-rich state, and the active Pd centers could activate O2 molecules to generate more reactive oxygen species and promote the conversion of toluene, which was verified by in situ XPS and O2-TPD characterization. Compared with the catalysts prepared by an impregnation method, the catalytic performance of the Pd/NH2-KIT-6 (0.5 wt %) catalyst was significantly improved. A conversion of 90% for toluene (2400 ppm, 24,000 mL·g–1·h–1) was achieved at 171 °C, and the toluene conversion was maintained above 90% for 900 min, displaying the excellent activity and stability of the Pd/NH2-KIT-6 catalyst.
研究领域:
环境科学
·
材料科学
✓ 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）