JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mengyue Zhu,Lei Guo,Zhongyi He,Riadh Marzouki,Renhui Zhang,Elyor Berdimurodov
N -doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
研究领域:
材料科学
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电化学
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防腐蚀研究
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Mingjun Cui,Siming Ren,Qunji Xue,Haichao Zhao,Liping Wang
Inspired by the high water solubility and low cytotoxicity of N doped carbon dots (CDs) prepared by using antibiotic aminosalicylic acid (ASA) as precursor, we anticipate that these CDs may possess an excellent protective ability to inhibit the corrosion of carbon steel in aggressive solutions owing to its special structure. Therefore, the investigation on the inhibiting effect of CDs as eco-friendly corrosion inhibitor for Q235 carbon steel corrosion in 1 M HCl solution is first reported. Electrochemical techniques , weight loss, morphological and elements characterization are combined to investigate the inhibiting effect and corrosion mechanism. The results show that corrosion of Q235 carbon steel in 1 M HCl solution is significantly inhibited by the addition of CDs, which is attributed to the formation of CDs adsorption film, and the adsorption of CDs obeys a Langmuir adsorption isotherm . Besides, the protection efficiency increases with increasing concentration of CDs and prolonged immersion time, and reaches equilibrium eventually.
研究领域:
材料科学
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环境科学
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电化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 26
·68467-68476
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IF 5.8
Yu Kun,Guo Jiaqi,Li Bing,Guo Jianzhong
Sorption is prominent in low price, high efficiency, availability, and eco-friendliness. Organic porous materials have the characteristics of easy functionalization, diverse structure and stability, and show great potential in adsorption, energy storage, catalysis, and other fields. A mesoporous phenolic resin-type polymer (PRP) was successfully synthesized and modified by solid state reaction with maleic anhydride to prepare adsorbent (called as PRP-MAH) for sorption of Pb 2+ . The impact of reaction conditions (the pH value, reaction temperature, fresh concentration of solution, ionic strength and reaction time, etc.) was systematically studied. Characterization methods such as SEM, FTIR, and XPS indicated that the synthesized adsorbent PRP-MAH had regular morphology and good stability. The fitting of isothermal adsorption experiment data conforms to Langmuir sorption isotherm, and the sorption capacity reached 366.40 mg·g −1 at 308 K. The kinetic data were consistent with the quasi-second-order model, which indicated that the chemisorption might play the main role in the sorption process. Thermodynamic research manifested that the sorption of Pb 2+ by PRP-MAH was carried out by a spontaneous process at the study temperature. The studies show that PRP-MAH can remove Pb 2+ from water solution through ion exchange, electrostatic attraction, and surface complexation.
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
RSC Advances
·
2021
·Vol. 11
·期 6
·3202-3208
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IF 3.361
Wei-Qi Li,Duan Liu,Ji-Yan Qu,Jian-Hong Luo
In this work, an outstanding nanolayered tin phosphate with 15.0 Å interlayer spacing, Sn (HPO4)2·3H2O (SnP–H+), has been synthesized by conventional hydrothermal method and first used in the adsorptive removal of Cr(III) from aqueous solution. A number of factors such as contact time, initial concentration of Cr(III), temperature, pH, and ionic strength on adsorption were investigated by batch tests. Moreover, the isothermal adsorption characteristics and kinetic model of Cr(III) onto SnP–H+ were studied. The results showed that the adsorption of Cr(III) by SnP–H+ was in accordance with the Langmuir adsorption isotherm model and the pseudo-second-order kinetic model. The adsorption capacity of Cr(III) onto SnP–H+ at temperature 40.0 °C and pH 3.0 could reach 81.1 mg g−1. And the distribution coefficient Kd was 23.0 g L−1. Overall, experiments certified that SnP–H+ was an excellent adsorbent that can effectively remove Cr(III) from aqueous solution.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Xuan Guo,Jianlong Wang
The Langmuir isotherm model is widely used for modeling adsorption equilibrium data. The linearization method is mostly applied for estimations of the Langmuir parameters. However, it is not unified and requires further study. In this paper, the applicability and accuracy of four linearization methods of the Langmuir isotherm (equilibrium adsorbate concentration ( C e )/equilibrium adsorption capacity ( q e )- C e , 1/ q e -1/ C e , q e - q e / C e and q e / C e - q e ) in parameter estimations by linear least squares regression (LSR) were compared. The influence of linearization on the assumption about errors in the LSR variables was analyzed. The results showed that Langmuir-1 ( C e / q e - C e ) and Langmuir-4 ( q e / C e - q e ) followed the assumption for all evaluated conditions whereas Langmuir-3 ( q e - q e / C e ) violated the assumption for all conditions. Langmuir-2 (1/ q e -1/ C e ) obeyed the assumption of LSR only when C e approached the initial adsorbate concentration ( C 0 ). Langmuir-1 ( C e / q e - C e ) provided the most accurate estimations of the Langmuir parameters, particularly at low levels of random errors in C e and when the errors (%) in estimated maximum adsorption capacity ( q m ) and constant ( K a ) ranged from −5% to 5% and from −15% to 15% at low levels of errors (−0.5–0.5 mg/L), respectively. The Langmuir-1 isotherm model adequately represented the experimental equilibrium data of sulfamethoxazole (SMX) onto activated carbon with an R 2 value of 0.96.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 8
·3853-3861
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IF 3.159
Yu-Long Wang,Lu Zhu,Bo-Long Guo,Su-Wen Chen,Wang-Suo Wu
Two functionalized SBA-15 materials were prepared by a post-grafting method using phosphonate derivatives of diethylethylphosphonate (DEP) and ethylphosphonic acid (PA), which were used as adsorbents for removal of uranium(VI) from aqueous solution. These materials were characterized by FT-IR, NMR, TEM, nitrogen adsorption/desorption experiments, and elemental analysis. The effect on uranium(VI) sorption behaviors of the functionalized SBA-15 was studied. Typical sorption isotherms (Langmuir and Freundlich) were determined for the sorption process, and the maximum sorption capacity was calculated. The influence of organic functional groups on uranium(VI) sorption was also discussed. As a result, SBA-15-ethylphosphonic acid (SBA-15-PA) possessed not only a good sorption ability and a desirable selectivity for U(VI) over a range of competing metal ions but also an excellent reusability, which has potential application in separation of uranium(VI).
研究领域:
环境科学
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材料化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Bin Guo,Fang Deng,Yu Zhao,Xubiao Luo,Shenglian Luo,Chaktong Au
A magnetic ion-imprinted polymer (Fe 3 O 4 @SiO 2 -IIP) functionalized with –SH groups for the selective removal of Pb(II) ions from aqueous samples was synthesized by surface imprinting technique combined with a sol–gel process using 3-mercaptopropyl trimethoxysilane as monomer, tetraethyl orthosilicate as cross-linking agent, and Pb(II) ion as template. The Fe 3 O 4 @SiO 2 -IIP was characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometry. Fe 3 O 4 @SiO 2 -IIP showed higher capacity and selectivity than that of Fe 3 O 4 @SiO 2 -NIP. The effects of initial concentration of Pb(II) and pH of medium on adsorption capacity of Fe 3 O 4 @SiO 2 -IIP were studied. The experimental data fits well with the Langmuir adsorption isotherm. The maximum Pb(II)-sorption capacity calculated from Langmuir isotherm is 32.58 mg/g and 16.50 mg/g for Fe 3 O 4 @SiO 2 -IIP and Fe 3 O 4 @SiO 2 -NIP, respectively. Kinetics studies show that the adsorption process obeys a pseudo-second-order kinetic model with high correlation coefficient ( R 2 = 0.9982). The separation factor of Fe 3 O 4 @SiO 2 -IIP for Pb(II)/Cu(II), Pb(II)/Zn(II), and Pb(II)/Co(II) are 50.54, 52.14, and 37.39, respectively. The adsorption thermodynamic parameters Δ G , Δ H and Δ S were −4.98 kJ/mol, 3.27 kJ/mol and 28.84 J/mol/K, respectively. In addition, the spent Fe 3 O 4 @SiO 2 -IIP can be refreshed by simple washing with aqueous HCl solution, and there is no significant decrease in adsorption capacity after a test of up to five cycles, demonstrating that the Fe 3 O 4 @SiO 2 -IIP is stable and reusable.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Bin Dong,Huiru Zhou,Yushi Liu,Huiqiu Zhang,Yihan Yang,Xin Long,Changchun Zhou
The addition of surfactants during synthesis enhances the hydrophilicity of the lithium adsorbent H 2 TiO 3 (HTO), thereby facilitating lithium extraction. In this work, lithium octanoate (C 7 H 15 COOLi) was used as a raw material to prepare the precursor Li 2 TiO 3 (LTO), in which it also acted as a surfactant to assist the sol–gel process. The optimal calcination temperature was determined based on powder X-ray diffraction (PXRD) patterns, scanning electron microscope (SEM) images and equilibrium adsorption capacity ( Q e ) of Li + . The corresponding sample HTO-2 was examined by contact angle measurement, whose water contact angle was much smaller than that of HTO-0 synthesized from lithium acetate (CH 3 COOLi). The enhanced hydrophilicity improved the interaction between HTO-2 and hydrated Li + complexes, resulting in the increased Q e for HTO-2 compared to HTO-0. The adsorption of Li + by HTO-2 was well described by Langmuir isotherm model and pseudo-second-order kinetic model, and Q e only showed a slightly decrease after ten cycles. Moreover, its excellent adsorption selectivity for Li + was demonstrated in simulated desalination brine. This work reveals the dual role of C 7 H 15 COOLi and the critical role of hydrophilicity in enhancing lithium extraction.
研究领域:
材料科学
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化学工程
·
无机化学
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环境科学
·
吸附技术
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xiaoqing Wang,Shangkun Liu,Shaolei Chen,Xubin He,Wenjing Duan,Siyuan Wang,Junzi Zhao,Liangquan Zhang,Qing Chen,Chunhua Xiong
Given the necessity and urgency in removing organic pollutants such as malachite green (MG) from the environment, it is vital to screen high-capacity adsorbents using artificial neural network (ANN) methods quickly and accurately. In this study, a series of ZIF-67 were synthesized, which adsorption properties for organic pollutants, especially MG, were systematically evaluated and determined as 241.720 mg g −1 (25 ℃, 2 h). The adsorption process was more consistent with pseudo-second-order kinetics and Langmuir adsorption isotherm , which correlation coefficients were 0.995 and 0.997, respectively. The chemisorption mechanism was considered to be π-π stacking interaction between imidazole and aromatic ring. Then, a Python-based neural network model using the Limited-memory BFGS algorithm was constructed by collecting the crucial structural parameters of ZIF-67 and the experimental data of batch adsorption. The model, optimized extensively, outperformed similar Matlab-based ANN with a coefficient of determination of 0.9882 and mean square error of 0.0009 in predicting ZIF-67 adsorption of MG. Furthermore, the model demonstrated a good generalization ability in the predictive training of other organic pollutants. In brief, ANN was successfully separated from the Matlab platform, providing a robust framework for high-precision prediction of organic pollutants and guiding the synthesis of adsorbents.
研究领域:
环境科学
·
化学工程
·
材料科学
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Meng Zhang,Haohao Hou,Hongfu Zhou,Aimin Xiang,Yafeng Deng
Faced with extensive water pollution caused by dyes and heavy metals, it is imperative to create cost-effective adsorbents that can effectively eliminate residual pollutants in wastewater. The synthesis of polyvinyl alcohol/xanthan gum (PVA/XG) hydrogels involved a combination of freeze-thaw cycling technique and the adsorption characteristics and mechanisms of methylene blue (MB) and heavy metal ions Pb 2+ were investigated. In comparison to pure PVA hydrogels, the swelling behavior of PVA/XG3 hydrogel exhibited a 185 % increase in swelling rate. The adsorption test results suggested that PVA/XG3 hydrogel was effective in absorbing MB (27.39 mg/g) and Pb 2+ (17.07 mg/g) from a 50 mg/L pollutant solution. The adsorption process of MB and Pb 2+ by PVA/XG3 hydrogel followed Langmuir adsorption isotherm and the QFO models, indicating a preference for homogeneous physical adsorption. Specifically, the Langmuir isothermal model predicted that the q max of MB and Pb 2+ by PVA/XG3 hydrogel were 94.47 and 58.50 mg/g, respectively. Therefore, this essay has created a cost-effective and environmentally friendly method for producing versatile PVA/XG hydrogels specifically intended for water treatment purposes.
研究领域:
环境科学
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材料科学
·
水处理
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Binchan Zhao,Huabin Jiang,Zongkun Lin,Shaofan Xu,Jun Xie,Aiping Zhang
Modified cellulose hydrogels were prepared by blending and cross-linking with acrylamide and acrylic acid . The structure of hydrogels was characterized and analyzed with fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Under the optimized conditions, the maximum absorption capacity in modified cellulose hydrogels of Cu (II), Pb (II) and Cd (II) ions were 157.51, 393.28 and 289.97 mg/g, respectively. In addition, the metal ion adsorption process accorded with pseudo-second-order rate equation and Langmuir adsorption isotherm. Based on the microstructure analysis and adsorption kinetics, the adsorption mechanisms such as physical, chemical, and electrostatic interactions are discussed. The adsorption process was controlled by the ion-exchange mechanism.
研究领域:
材料科学
·
环境化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao-Peng Wang,Xu-Hui Huang,Jia-Nan Chen,Meng Dong,Cheng-Zhen Nie,Lei Qin
Microplastics (MPs) stemming from plastic products have attracted wide attention around the world due to their stealth, persistence and potential threat to humans. It is essential to remove MPs by using eco-friendly and effective methods. In this study, to remove MPs, we proposed to prepare Fe 3 O 4 superhydrophobic magnetic adsorbents (Fe 3 O 4 @C n , n = 12, 14, 16, 18) modified by different saturated fatty acids (C 12 , C 14 , C 16 , C 18 ) by liquid phase deposition method. Transmission electron microscope, atomic force microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometry and nitrogen adsorption measurements were applied to characterize the morphology, functional groups, crystalline structures of Fe 3 O 4 @C n as well as its magnetic properties and pore size distribution. It was shown that Fe 3 O 4 @C n exhibited the characteristics of magnetic materials with superhydrophobic properties and thus possessed the ability to separate oil and water. During the removal of MPs in five liquid food systems, Fe 3 O 4 @C 12 exhibited 92.89 % adsorption efficiency, which was ascribed to the electrostatic and chemical bonding interactions between MPs and Fe 3 O 4 @C n , as suggested by density functional theory (DFT) calculations. In addition, the presence of organic matter in water can decrease the removal efficiency of Fe 3 O 4 @C n due to the competitive adsorption effect. Simulation by Langmuir isotherm model suggested that Fe 3 O 4 @C 12 displayed the greatest adsorption efficiency for Polystyrene (PS) (809.29 mg/g), which is higher than that of Fe 3 O 4 @C 14 , Fe 3 O 4 @C 16 , and Fe 3 O 4 @C 18 . In addition, Langmuir adsorption isotherm and Gaussian calculations suggested that PS was removed by Fe 3 O 4 @C 12 through an exothermic reaction controlled by chemisorption. Overall, these results indicated that superhydrophobic magnetic materials prepared in this study show high potential for removing MPs in aqueous systems due to their low costs, good environmental friendliness, and high removal performance.
研究领域:
环境科学
·
纳米技术
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材料科学
·
食品科学
✓ 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）