Materials
·
2019
·Vol. 12
·期 9
·1536
·
IF 2.972
Peng Wang,Qi Sun,Yujiao Zhang,Jun Cao
Zeolite 4A was successfully prepared by hydrothermal synthesis using low-grade kaolin as a raw material. The properties of the synthesized zeolite 4A were characterized by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR),29Si magic-angle spinning (MAS)-nuclear magnetic resonance (NMR) and27Al MAS-NMR, X-ray fluorescence (XRF), scanning electron microscopy (SEM)-energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), thermogravimetry (TG)-differential thermal analysis (DTA), and carbon dioxide adsorption analysis. The textural properties of the synthesized zeolite 4A was further studied by BET analysis technique. The thermal stability analysis showed that the heat resistance of the synthesized zeolite 4A is up to 940 °C. In addition, it is found that the Langmuir model has the best agreement with the adsorption equilibrium data for carbon dioxide by synthesized zeolite 4A and commercial zeolite 4A. Meanwhile, the carbon dioxide adsorption analysis confirmed that the maximum equilibrium adsorption amount of carbon dioxide on synthesized zeolite 4A is 59.3820 mL/g, which is higher than the 55.4303 mL/g of the commercial zeolite 4A.Keywords:kaolin;zeolite 4A;carbon dioxide;adsorption equilibrium
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Yu Zhang,Wei Su,Yan Sun,Jia Liu,Xiuwu Liu,Xiaojing Wang
MIL-101 is a promising adsorbent because of its large pore volume, high separation selectivity, easy regeneration, and good stability. MIL-101 was synthesized and characterized by X-ray diffraction, scanning electron microscopy, and nitrogen adsorption at 77 K. Adsorption isotherms of pure N2, CH4, and CO2 were measured on MIL-101 from 263 K to 313 K and at pressures up to 0.8 MPa. The Langmuir model was a good fit for the experimental isotherms and the isosteric heats of adsorption decreased in the order: CO2 > CH4 > N2. The CO2/CH4 separation selectivity was sensitive to the adsorption pressure and temperature and it varied from 3.2 to 6.3. In contrast, the CH4/N2 separation selectivity changed from 2.6 to 3.3 with temperature and pressure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xueli Zhang,Yan Sun,Wei Su,Xueyuan Wang
As a new kind of adsorbent, graphene sheets (GS) possess large surface areas and excellent adsorption properties. To investigate the adsorption equilibria of C1–C4 from natural gas on GS and fit the isotherms by the Langmuir–Freundlich equation. GS were synthesized with a specific surface area of 805 m2/g and a specific pore volume of 1.03 cm3/g. The adsorption isotherms were measured using a volumetric method at five different temperatures between 263.15 and 303.15 K and at pressures of 0–6 MPa for CH4, 0–1.6 MPa for C2H6, 0–0.3 MPa for C3H8, and 0–0.05 MPa for C4H10. It was shown that, for all four hydrocarbons, the amount of adsorption decreased gradually as the temperature increased. The isotherms were described well by the Langmuir–Freundlich equation. The isosteric heat of adsorption values decreased in the order C4H10 > C3H8 > C2H6 > CH4 which was consistent with those of the extreme heats of adsorption. This suggests that the adsorption capacities of C1–C4 on GS decreased in the order C4H10 > C3H8 > C2H6 > CH4.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Fang,Baoyu Qian,Ying Yang,Yang Song,Zhaoguang Yang,Haipu Li
Purification of high-arsenic (>10 µg/L) groundwater is of significance for drinking water safety all around the world. Considering the dominant presence of arsenite (As(III)) in groundwater and ineffective adsorption of As(III) by traditional adsorbents, the magnetic Zn/Co bimetallic MOFs (Zn/Co MOFs) which contain both catalytic and adsorption sites were prepared, and coupled with peroxymonosulfate (PMS) to realize the efficient simultaneous oxidation of As(III) and adsorption of evolved As(V). Considering the vital roles of oxidation and adsorption, the molar ratio of Zn and Co precursors was tuned ranging from 1: 1 to 9: 1 during Zn/Co MOFs synthesis to balance the catalysis and adsorption processes in the heterogeneous PMS system for As(III) immobilization. It was found that Zn/Co MOFs with Zn and Co molar ratio of 5: 1 possessing moderate catalytic performance and best adsorption capacity outperformed removal performance for As(III). The presence of PMS significantly promoted the elimination of both As(III) (the initial adsorption rate increased from 31.19 to 358.96 µg/g/min) and As(V) (the initial adsorption rate increased from 354.12 to 497.85 µg/g/min), which not only oxidized As(III) into As(V) by reactive species generated from PMS activation but also provided additional adsorption sites through enlarging pore size and changing chemical environment. Furthermore, Zn/Co MOFs coupled with the PMS system exhibited outstanding reusability and effectiveness for remediation of real high-arsenic groundwater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2013
·
IF 0.6
Chi
Fang Ting,Xiong Jie,Hou
Jing Wei,Gu Mei,Hu Sheng,Wang
Xiao Lin
Amidoxime (AO)/amine co-functionalized polypropylene fiber adsorbents were prepared. The all-polymeric structures were characterized by using Fourier transform infrared spectroscopy (FTIR), optical microscope, contact angle meter and electron spin resonance (ESR) analysis methods, confirming the grafting, modification, and amidoximation stages gravimetrically, spectroscopically, and visually. The properties for the removal of uranyl(VI) from aqueous solutions were investigated. For amidoxime (AO) fiber, high adsorption rate was observed within the first 30 minutes and the plateau value of 40.6% uranium loading (0.0812 mg/g) was reached at around 30 minutes. The adsorption equilibrium for AO/amine fiber was attained within 20 minutes, resulting in the adsorption of 92.6% uranium loading (0.185 mg/g). The percentage of adsorption increases with increasing pH value (2–6), reaches a maximum at pH 6.0 and then remains almost constant for AO/amine fiber, whereas reduces slightly for AO fiber.
研究领域:
材料科学
·
环境化学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Ming Li,Haixin Sun,Chen Wang,Yongzhuang Liu,Qinqin Xia,Juan Meng,Haipeng Yu,Shuo Dou
The electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) represents an environmentally friendly approach to generate high-value-added chemicals from biomass. The successful electrochemical transformation of HMF during the oxidation reaction (HMFOR) necessitates an ideal adsorption interaction between HMF and OH − on the electrode surface. Yet, catalysts with a singular active site offer limited flexibility in managing the competitive adsorption of HMF and OH − . To this end, different active sites are customized in this work to construct a P and N co-doped porous carbon that wrapped Co 3 O 4 (Co 3 O 4 @PNC). Co-doping with these two heteroatoms generates C 3 P = O and pyrrolic N as adsorption sites to better balance the adsorption of HMF and OH − , respectively, rather than promoting competition between the HMF and OH − on a single active site. With this design strategy, Co 3 O 4 @PNC demonstrates significant HMFOR activity, the conversion rate of HMF surpassed 99% with a 2,5-furandicarboxylic acid (FDCA) yield exceeding 95% after 2 h of electrolysis. Furthermore, it shows universal applicability in the electrooxidation of other alcohol/aldehyde substrates, yielding efficiencies of 90–99%. This work not only provides guidance for advanced electrocatalysts design toward alcohol/aldehyde oxidation but also offers insights into the utilization of biomass-derived platform chemicals.
研究领域:
催化材料科学
·
电化学工程
·
生物质转化
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhuo Chen,Qianying Wu,Ying Xu,Jinhan Mo
Organic films were widely found on indoor impermeable surfaces exposed to gaseous organic compounds, but few studies have addressed the film growth details on different indoor substrates. In this study, we observed the topography evolution of phthalic acid ester (PAE) organic films on three impermeable substrates: polished glass (G-P), mirror-polished stainless steel (SS-M) and drawn stainless steel (SS-D). PAE organic films were preferentially formed upon the flat surface with sparse inherent nano-peaks of substrate G-P and in valleys of substrate SS-M and SS-D. Surface uniformity of substrates and viscosity of PAE molecules were inferred as critical parameters determining the surface average adhesion forces. We obtained the partition coefficients of DEP , DnBP, BBP and DEHP on substrate G-P, SS-M and SS-D by fitting the initial monolayer adsorption process. Organic films continuously grew instead of reaching adsorption equilibrium after long-term PAE exposure, indicating that multilayer adsorption may occur. The organic film growth rates in saturated gas-phase PAE concentrations were quantified as about one-tenth of the results in previous studies where substrates were simultaneously exposed to multiple pollutants. To sum up, the results outline PAE adsorption details on impermeable materials and provide a reference for better estimation on PAE exposure assessment.
研究领域:
环境科学
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化学
·
材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2012
·Vol. 180
·期 3
·219-226
·
IF 3.033
Jiang Xiujuan,Huang Lingman,Liu Xiaoming
Magnetic nanoparticles (MNPs) coated with silica gel were prepared, then functionalized with a tridentate ligand via a silane coupling agent (3-chloropropyl)triethoxysilane, and finally loaded with Cu(II) ions. The resulting materials were characterized by TEM, SEM, XRD, FTIR and TGA techniques. They display strong affinity for BSA with an adsorption capacity as high as 235 mg g −1 and with a fast (30 min) establishment of adsorption equilibrium. Repetitive adsorptions (6 times) hardly affect the adsorption capability. The kinetics and isotherm of the adsorption of BSA were also investigated.
Core-Shell magnetic nanoparticles functionalised with tridentate ligand BPA which binds Cu(II) were prepared. The materials adsorb BSA with high adsorption capacity (235 mg g −1 ) and fast establishment of adsorption equilibrium (30 min). Repetitive adsorption-desorption (6 times) did not affect significantly the adsorption capacity.
研究领域:
纳米技术
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材料科学
·
生物技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 11
·1-10
·
IF 2.8
Peng Lin-Ling,Zhou Wei-Fang,Chen Min,Li Li-Jun,Liu Yu,Zhou Cong-Shan,Xie Jun,Tang Ke-Wen
A novel disulfide functionalized nitrogen-rich covalent organic polymer (S-COP) directly synthesized by a solvothermal method were characterized by XRD, SEM, FT-IR, N 2 adsorption–desorption and XPS techniques. The as-synthesized polymer shows efficient adsorption performance for Au(III) from aqueous solution. The adsorption equilibrium of the adsorbent could be achieved within 5 h, and the as-synthesized S-COP exhibits an exceedingly high Au(III) uptake capacity of 1506 mg·g −1 . Furthermore, S-COP has satisfactory selectivity and reusability, which is a highlight of adsorption materials.
研究领域:
材料科学
·
环境化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Qilong Peng,Yu Chen,Diyi Fang,Chuanlei Liu,Kongguo Wu,Yuxiang Chen,Hao Jiang,Yuanyuan Sun,Qiumin Wu,Di Wu,Hui Sun
ETS-4 shows great potential to achieve effective separation of challenging mixtures due to its promising tunability of pores. However, the regulation of pore size is largely limited by its low thermal stability. Here, Na-ETS-4 was synthesized by the hydrothermal method and additionally modified via ion exchange coupled with thermal treatment. Structures of all synthesized samples were examined using a variety of characterization techniques. Both adsorption equilibrium and kinetics of CO2 and CH4 on these adsorbents were evaluated on custom-made adsorption units. In addition, the mechanism of CO2 adsorption on different structural models of ETS-4 was revealed via combining with the molecular dynamics (MD) simulations. Ion exchange largely improves the thermal stability of ETS-4 and its adsorption capacities for CO2 and CH4. Ba-ETS-4-350 exhibits the largest equilibrium selectivity of 12.42 and the greatest Henry’s selectivity of 2178.51. The radial distribution function (RDF) results reveal the main adsorption sites of CO2 in different ETS-4 structures.
研究领域:
材料科学
·
化学工程
·
环境科学
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 26
·7227-7236
·
IF 3.637
Li Jie,Ma Miaoxia,Zhang Chenhui,Lu Rui,Zhang Lingyi,Zhang Weibing
A molecularly imprinted polymer and metal organic framework were combined to prepare protein imprinted material. MOF-74(Ni) was used as a matrix to prepare surface-imprinted material with lysozyme as a template and polydopamine as an imprinting polymer. MOF-74(Ni) not only provides a large surface area (150.0 m 2 /g) to modify the polymer layer with more recognition sites ( Wt (Ni) = 42.24%), but also facilitates the immobilization of lysozyme by using the chelation between Ni 2+ of the MOF-74(Ni) and protein. The thin polydopamine layer (10 nm) of the molecularly imprinted material (named MOF@PDA-MIP) enables surface imprinting. Benefiting from the thin polymer layer, MOF@PDA-MIP reached adsorption equilibrium within 10 min. The maximum adsorption capacity reaches 313.5 mg/g with the highest imprinting factor (IF) of 7.8. The specific recognition sites can distinguish target lysozyme from other proteins such as egg albumin (OVA), bovine serum albumin (BSA) and ribonuclease A (RNase A). The material was successfully applied to separation of lysozyme from egg white.
Graphical abstract
研究领域:
材料科学
·
生物技术
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 39
·15741-15751
·
IF 5.101
Jianming Pan,Wei Hu,Xiaohui Dai,Wei Guan,Xiaohua Zou,Xue Wang,Pengwei Huo,Yongsheng Yan
Magnetic composites (MCs) were achieved via coating a chitosan layer containing γ-Fe2O3 nanoparticles onto the surface of aldehyde-functionalized fly-ash-cenospheres. Based on these MCs, the magnetic molecularly imprinted polymers (MMIPs) were further synthesized and characterized, and used to selectively recognise bisphenol A (BPA) molecules. Owing to the intrinsic advantages of cross-linked chitosan, magnetic γ-Fe2O3 nanoparticles and spherical FACs, the results demonstrated that these spherical shaped MMIPs particles had magnetic sensitivity (Ms = 2.221 emu g−1) and magnetic stability (especially over the pH range of 6.0–12). Batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition. The Langmuir isotherm model was fitted well to the equilibrium data of the MMIPs, and the monolayer adsorption capacity of the MMIPs was 135.1 mg g−1 at 298 K. The kinetic properties of the MMIPs were well described by the pseudo-second-order equation, indicating the chemical process could be the rate-limiting step in the adsorption process for BPA. Selective recognition experiments demonstrated the high affinity and selectivity of MMIPs towards BPA over competitive phenolic compounds. The molecular interaction between BPA and methacrylic acid (MAA) was investigated by the 1H-NMR spectrum. Hydrogen bonding was proved to be mainly responsible for the recognition mechanism, and the specific recognition effect may be based on the distinct size, structure and functional group of the template molecules.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 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）