JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Qiuping Fu,Jie Lou,Hui Yuan,Rongbin Zhang,Chunmei Zhang,Changli Mo,Jun Luo,Lei Zha,Pan Wu
ZIF-67@CS composites were prepared by in-situ growth method. The phase and structure of ZIF-67@CS composite were characterized by X-ray powder diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR). The morphology of the materials was characterized by field emission scanning electron microscope (SEM). X-ray photoelectron spectroscopy (XPS) measurements demonstrated the existence of Pb(II) after the adsorption process of composite materials. The adsorption of Pb(II) by composite material conforms to Langmuir model, the theoretical maximum adsorption capacity is 505.051 mg/g. The pseudo-second-order kinetic model can well describe the adsorption kinetic process.
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
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 11
·7876-7886
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IF 5.2
Xiao Zhan,Junzhuo Sun,Daohai Zhang
This study is aiming to prepare the porous PBAT/modified zeolite composite by the simple, rapid, and efficient method of preparing them by the solution coating process with modified zeolite as adsorbent, as well as with PBAT as carrying agents and with ethanol as porogenic agent. Some influencing factors for adsorbing PBAT/modified zeolite composite membrane in Lead-Ion-Heavy Metal wastewater were researched in this paper, including the effects of zeolite content, modifier type, initial pH, pore-making agent, adsorption time, adsorption temperature, initial concentration, and feeding quantity. In addition, the adsorption processes of the porous PBAT/modified zeolite composite membrane are studied by means of the adsorption kinetics and adsorption isotherm models. The finding shows the kinetic data were consistent with the pseudo-second-order model, and the data fitting of isothermal adsorption experiment is closer to the Langmuir adsorption model, which is a single-molecule adsorption process and belongs to chemisorption, with a saturation adsorption amount of about 106.3 mg/g. Therefore, zeolite has great prospects for the removal of Pb(II) in wastewater, and provides a theoretical basis for the efficient treatment of heavy metal-containing wastewater. Highlights A composite film that can effectively remove Pb(II) from water was prepared. The composite exhibits rational pore structure and high specific surface area. This composite has advantages of biodegradability and reproducibility.
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
ELECTROCHEMISTRY COMMUNICATIONS
·
2017
·
IF 4.396
Fengjin Qu,Xiaoyan Ma,Lin Zhu,Fang Chen
A new photoswitchable electrode triggered by a brief light signal was fabricated by depositing an azobenzene-containing copolymer on an indium tin oxide substrate decorated with gold nanoparticles . The polymer formed a compact, complete thin film on the electrode surface using the Langmuir–Schaefer technique and offered reversible and stable switching performance. The conductivity and hydrophilicity of the electrode changed under UV/visible light due to the photoisomerization of the azobenzene moieties in the polymer film, influencing electron transfer and mass transport at the electrode. The electrochemical characterization demonstrated that the electrode exhibited reversibly switchable electrochemical behavior. In its active state, the as-prepared electrode possessed efficient electrocatalytic capability towards uric acid oxidation with a maximum anodic current density of 0.97 mA·cm − 2 . The uric acid/air fuel cell assembled from the photo-triggered anode and a Pt/C-modified cathode operated with an open circuit voltage of 0.12 V and a maximum power density of 41.33 μW·cm − 2 . The cell exhibited reversible switching performance (four cycles) and high stability: after one month the power output was 94.2% of the original maximum value.
研究领域:
生物化学
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材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2021
·Vol. 98
·期 2
·389-400
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IF 2.326
Liu Ting,Liu Qun,Liu Yuan,Yao Hang,Zhang Zhihua,Wang Xiaodong,Shen Jun
With SiO 2 gel as the main skeleton material, the surface modification with methyl acrylate (MA) and tetraethylenepentamine (TEPA) was carried out by Michael addition and substitution reaction, after CO 2 supercritical drying TEPA and MA modified SiO 2 aerogel (TEPA–MA–SA aerogel) was obtained. The sample exhibited selectivity and enormous adsorption capacities for Cu 2+ (218.57 mg g –1 ). The removal rate of Cu 2+ in ternary-mixed metal solution reached 49.29%, ranking first among the materials we have known. MA and TEPA both contain rich groups such as –NH 2 and –NH–, which provide abundant adsorption sites for adsorbing heavy metal ions. BET test showed that the specific surface area, the pore volume, and the pore diameter was 190.2 m 2 g −1 , 4.426 cm 3 g −1 and 9.306 nm respectively. The above properties facilitated capture for Cu (II). The adsorption data were fitted with Langmuir and Freundlich adsorption isotherm models, and both models could describe the adsorption process. However, according to the fitting parameters, Langmuir adsorption isotherm model explicates the adsorption process better. Although the pore structure and specific surface area are beneficial to the physical adsorption, chemical chelation still plays a major role. XPS analysis further proved the possible adsorption mechanism that N and O atoms adsorb Cu (II) ions through chelation. Altogether, TEPA–MA–SA aerogel is suitable as an auxiliary adsorbent to purify contaminated water.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 21
·5047
·
IF 3.057
Jun Cao,Peng Wang,Jie Shen,Qi Sun
Here, using Fe3O4@SiO2as a precursor, a novel core-shell structure magnetic Cu2+adsorbent (Fe3O4@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu2+adsorption capacity of Fe3O4@zeolite NaA at different pH values, contact time, initial Cu2+concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe3O4@zeolite NaA on Cu2+is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe3O4@zeolite NaA to Cu2+follows the pseudo-second kinetics model, which means that the combination of Fe3O4@zeolite NaA and Cu2+is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe3O4@zeolite NaA is a promising Cu2+adsorbent.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
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2016
·Vol. 22
·期 8
·1147-1155
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IF 1.87
Habimana Fabien,Huo Yanxia,Jiang Sai,Ji Shengfu
Europium metal organic framework (Eu-MOF) was synthesized using Europium as metal ion center and 1,3,5-trimesic acid (H 3 BTC) as organic ligand under hydrosolvothermal conditions. The dynamic performance of the Eu-MOF material in adsorption desulfurization processes was investigated using a solution of thiophene/n-octane as sulfur containing quality model oil. The adsorption desulfurization kinetics equations and adsorption desulfurization isotherms of Eu-MOF were also studied. The results have shown that Eu-MOF catalyst has very good adsorption desulfurization abilities under optimum desulfurization conditions of m adsorbent : m model oil ratio of 1:100 and reaction temperature of 303 K. After 4 h of desulfurization reaction, the adsorption rate and the adsorption desulfurization capacity has reached 64.70% and 24.59 mgS/gMOF respectively. The Eu-MOF adsorption desulfurization process of thiophene on Eu-MOF fits well the quasi two level dynamic model using Langmuir isotherm, Freundlich isotherm and Dubinin–Radushkevich isotherm equations. The Dubinin–Radushkevich isotherm can be a suitable description of adsorption process for Eu-MOF absorbent on thiophene/n-octane mode oil. However the Freundlich isotherm equation model with fitting R
2 value closer to 1, can be a better description for the adsorption of thiophene. The adsorption of thiophene over Eu-MOF absorbent has two types of adsorption that occur simultaneously. These are the monolayer physical adsorption and the multilayer chemical adsorption.
研究领域:
材料科学
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环境化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2012
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IF 4.173
Jun-Chao Zuo,Sheng-Rui Tong,Xiao-Lin Yu,Ling-Yan Wu,Chang-Yan Cao,Mao-Fa Ge,Wei-Guo Song
Two novel adsorbents to remove excess arsenate and arsenite in the drinking water were prepared for the first time by grafting monoamine and diamine, respectively, and then coordinating Fe 3+ on silica gel that was obtained using sol–gel method with two-step acid-base catalysis. It was found that both adsorbents had mesoporous structure, large specific surface, and high amino and iron content according to N 2 adsorption isotherms, FTIR, XPS, and NMR analysis. The removal ability and adsorption rate of the adsorbents were very high for both As(V) and As(III). Langmuir and Freundlich models were used to fit the adsorption isotherm and investigate the adsorption mechanism. The effects of chloride and sulfate anion on the removal of arsenate and arsenite for the two adsorbents were also studied.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Yumin Liang,Chenhui Liu,Zhiyu Ma,Jiyun Gao,Yanxin Wu
HKSUT-1 is often used as an adsorbent because of its excellent adsorption properties. In this study, Ag + was impregnated into the HKSUT-1 precursor solution using the impregnation method, with sodium borohydride (NaBH 4 ) serving as the reducing agent. This was done to examine the removal efficiency of NR dye. The Ag-HKSUT-1 composites were prepared by varying the additions of AgNO 3 and NaBH 4 . The morphology and structure of the Ag-HKSUT-1 composites were characterized by TG, FT-IR, BET and TEM. The adsorption performance of AH1 for neutral red dye in wastewater was investigated. The adsorption process was described by the Langmuir model and the pseudo-second-order kinetic model. The adsorption capacity of AH1 for NR dye at 298 K was calculated to be 64.59 mg/g, indicating that Ag-HKUST-1 effectively adsorbed NR dye. The adsorption process is driven by a chemisorption mechanism, where intermolecular forces between Ag-HKUST-1 and NR, electrostatic interactions, and π-π conjugation between benzene rings play key roles. The results enhance our understanding of the surface interactions between Ag-HKUST-1 and NR dyes and broaden the application of HKUST-1 as an adsorbent for pollutant removal in water.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yinyin Peng,Ting Pan,Chuang Chen,Yuchen Zhang,Guoyuan Yuan,Derong Liu,Xiaoqin Pu,Wei Xiong
In this study, researchers developed a novel composite material called NH2-MIL-53-Al/PAN, which consists of metal–organic frameworks (MOFs) grown on electrospun PAN nanofibers (NFs). The successful formation of the composite was confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR), and the hydrophilicity of NH2-MIL-53-Al/PAN was demonstrated by the water contact angle (WCA). Batch experiments were conducted to investigate the adsorption performance of Co(II) under different conditions. The maximum adsorption capacity reached 58.72 mg/g, and almost 95% of the adsorption was achieved within the first 6 h. The adsorption process was found to be spontaneous and endothermic and followed the pseudo-second-order kinetics and Langmuir models. Chemisorption and molecular layer adsorption are the main mechanisms of adsorption, and X-ray photoelectron spectroscopy (XPS) analysis further reveals that the interaction between the adsorbent and cobalt is a coordination interaction. In this study, NH2-MIL-53-Al was grown in situ on PAN to ensure effective loading of MOFs and prevent agglomeration during the NF mixing process. This approach successfully addressed the challenge of exposing active sites within the embedded MOF crystals. Additionally, it overcame the difficulty of recycling traditional MOF adsorbents. As a result, the exceptional performance of MOF NFs offers a promising solution for the efficient removal of cobalt-containing wastewater.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Sumei Li,Fan Feng,Sha Chen,Xiaolei Zhang,Yixuan Liang,Saisai Shan
MOFs are usually used as efficient adsorbents to remove specific pollutants in water. However, because of their poor water stability relatively small particle size, their application in adsorbing and removing pollutants from water is limited. In this paper, with nitrile rubber sponge as the substrate, UiO-66-NH 2 /sponge composites were firstly in-situ synthesized and systematically evaluated UiO-66-NH 2 as an adsorbent to remove 2,4-dichlorophenoxyacetic acid from water. This composite could not only remain the adsorption capacity for 2,4-dichlorophenoxyacetic acid of UiO-66-NH 2 , but also was much more convenient for separation after the adsorption compared to UiO-66-NH 2 . In addition, the mechanism of the adsorption of UiO-66-NH 2 for 2,4-dichlorophenoxyacetic acid were discussed in detail. Electrostatic interaction between UiO-66-NH 2 and 2,4-dichlorophenoxyacetic acid was the main adsorption mechanism. The adsorption was mainly suitable for Langmuir isotherm models, and its maximum adsorption capacity of 2,4-dichlorophenoxyacetic acid was 72.99 mg g −1 .
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 15
·4863
·
IF 4.927
Shun Li,Zuquan Zheng,Zhicheng Zhao,Youling Wang,Yao Yao,Yong Liu,Jianming Zhang,Zuotai Zhang
CeO2nanoparticle-loaded MnO2nanoflowers, prepared by a hydrothermal method followed by an adsorption-calcination technique, were utilized for selective catalytic reduction (SCR) of NOxwith NH3at low temperatures. The effects of Ce/Mn ratio and thermal calcination temperature on the NH3–SCR activity of the CeO2-MnO2nanocomposites were studied comprehensively. The as-prepared CeO2-MnO2catalysts show high NOxreduction efficiency in the temperature range of 150–300 °C, with a complete NOxconversion at 200 °C for the optimal sample. The excellent NH3–SCR performance could be ascribed to high surface area, intimate contact, and strong synergistic interaction between CeO2nanoparticles and MnO2nanoflowers of the well-designed composite catalyst. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) characterizations evidence that the SCR reaction on the surface of the CeO2-MnO2nanocomposites mainly follows the Langmuir–Hinshelwood (L-H) mechanism. Our work provides useful guidance for the development of composite oxide-based low temperature NH3–SCR catalysts.Keywords:Mn-Ce mixed oxide;ion-adsorption;selective catalytic reduction;NOxconversion
研究领域:
环境科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Guohua Li,Pengfei Bian,Ran Wang,Yan Li,Huiju Cao,Senlin Zhang,Zongshuo Hao,Mingli Wang,Tifeng Jiao
Through this study, a variety of carbon spheres/dye (CS/dye) composite films were prepared based on the Langmuir-Blodgett (LB) technology. The prepared CS/dye composite films were tested for acid and alkali gases discoloration characteristics. The CS/CR composite film shows good acid/alkaline gas sensing performances, and its characteristic absorption peaks have a significant movement in the UV–vis spectrum. In addition, the surface enhancement of the Raman scattering (SERS) experiment proves the good Raman enhancement performance of the prepared composite LB film with the enhanced factor (EF) of 8.5 × 10 4 . The relative standard deviation of Raman intensity is 24.74 %, indicating the good reproducibility and uniformity of composite film, which makes it applicable to the detection of trace molecules. Furthermore, the CS/NR composite film has a current density of 1217 μA/cm 2 when the potential voltage is 1 V, indicating that the composite film has a high carrier transfer rate, which provides a reference for further exploration of optoelectronic devices of CSs system.
研究领域:
材料科学
·
分析化学
·
光学
✓ 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）