查找使用阿拉丁产品的科研文献

Facile synthesis of 5A zeolite from attapulgite clay for adsorption of n-paraffins

Chen Le,Wang Yue-Wei,He Ming-Yang,Chen Qun,Zhang Zhi-Hui

5A zeolites were facilely synthesized from attapulgite clay and sodium aluminate precursors. The optimum synthesis condition for 4A zeolite (Na-form) were H 2 O/attapulgite ratio of 40:1 volume/mass, NaOH/attapulgite mass ratio of 2.35:1, the crystallization time was 4 h at 80–85 °C. The 4A zeolite was converted to related 5A zeolite (Ca-form) through ionic exchanges using calcium chloride solution with the Si/Al mole ratio of 1.3. SEM images demonstrated that as-synthesized 5A zeolites are ordered cubic crystals, average crystals length dimension is 1–2 μm. And the zeolites product had a specific surface area of 482 m 2  g −1 and total pore volume of 0.274 cm 3  g −1 . The static adsorption experiments showed that the equilibrium adsorption capacities of n -decane and n -pentadecane on produced 5A zeolite were 0.253 and 0.510 g g −1 , respectively. And the adsorption equilibrium time of n -decane and n -pentadecane on 5A zeolite were 45 and 60 min, respectively. The experimental adsorption data of n -decane and n -pentadecane on three zeolites could be properly fitted by the Langmuir–Freundlich isotherm model.

Effect of modified attapulgite addition on the performance of a PVDF ultrafiltration membrane

Yalei Zhang,Jing Zhao,Huaqiang Chu,Xuefei Zhou,Yong Wei

Attapulgite (APT), which is a highly hydrophilic fibrillar mineral in nature, is a promising new additive for preparation of ultrafiltration (UF) membranes. In this work, APT particles were first grafted with NH 2 using the silane coupling agent APTES to detach the crystal bundles to single crystal and enhance the uniform dispersion in an organic polymer matrix ; these components were subsequently incorporated into a polyvinylidene fluoride (PVDF) matrix to develop a hybrid membrane via a phase inversion method. The modified APT mineral was characterized using SEM and FTIR to confirm the presence of the amine group on the surface. Other techniques (i.e., FTIR-ATR, XRD and TGA) and parameters (i.e., porosity, the average pore size , contact angle and filtration measurements of water and bovine serum albumin (BSA)) were applied and measured to study the performance of the UF membranes. Compared with the pure PVDF sample, the APT particle blended membranes exhibited better thermal stability, smaller pore size and higher hydrophilicity. More importantly, the values for pure flux, flux recovery ratio (FRR) and rejection of BSA solution all indicated that the PVDF/APT hybrid membranes offer excellent hydrophilicity, water permeability and good antifouling performance.

Molecularly imprinted polymers based on attapulgite and sustained-release properties for 5-FU

Ji Xinyuan,Yang Zhe,Fang Jiahui,Hu Sheng

In this study, a novel molecularly imprinted polymer (MIP) was synthesized with attapulgite (ATP) and acrylamide (AM) and ethyl methacrylate (MMA) for controlled release carrier of 5-fluorouracil (5-FU). The MIPs (PAM-PMMA) were characterized by XRD, FESEM, HRTEM, and FTIR. The drug loading and in vitro controlled release ability of MIP on 5-FU was investigated by adsorption property analysis and in vitro release analysis. MIPs (PAM-PMMA) reached a maximum drug loading of 12 mg/g and a maximum release of 80% at an ATP dosage of 0.2 g (0.4%), an initial concentration of 5-FU of 100 mg/L, and an adsorption time of 240 min. Cytotoxicity analysis showed that the maximum inhibition of cells could reach 25% at 72 h of cell culture time under the above conditions. The results showed that MIPs synthesized with ATP as the substrate and AM and MMA as the functional monomers were successfully synthesized and could be used as a drug delivery system for 5-FU. Graphical

A bifunctional self-healing coating enhanced by attapulgite functionalized MXene with inhibitor integration

Mustehsin Ali,Hongwei Shi,Faheem Jan,Sharjeel Ahmed,Yingwei Song,En-Hou Han

Ti 3 C 2 T x nanosheets, emerging as revolutionary 2D nanomaterials, have sparked interest in advanced applications due to their thin-layered architecture and promise as innovative nanofillers for a variety of applications. To address the oxidation and stacking of Ti 3 C 2 T x nanosheets with the polymer, a novel multifunctional Ti 3 C 2 T x -based nanocomposite is engineered by an etching method. The Ti 3 C 2 T x surface is functionalized with 3-aminopropyltriethoxysilane (APTES), and attapulgite (ATP) is implanted on the NH 2 -Ti 3 C 2 T x interface to lower the cohesive energy between nanosheets. The novel self-healing epoxy films were achieved by encapsulating self-healing components ((8-hydroxyquinoline (8-HQ) + 2-mercaptobenzothiazole (MBT)) in the ATP-based NH 2 -Ti 3 C 2 T x nanocomposite (AMQM). Inhibited AA2024-T3 surface revealed hydrophobic nature, whereas the pH sensitive coatings exhibited strong adherence to the substrate and improved compatibility and mechanical strength. The impedance of artificially scratched epoxy film rose from 0.073 M Ω cm 2 to 0.198 M Ω cm 2 (after 12 h) and from 0.027 M Ω cm 2 to 2.189 M Ω cm 2 (after 96 h) in comparison with the control samples. Simulations depict the presence of hydrogen bonds between the inhibitors and the 2024-T3 alloy, as well as twice the adsorption energy compared to the individual inhibitors. Therefore, a novel pH-sensitive self-healing coating offers a synergistic approach for promising corrosion suppression.

Adsorption of Cr (VI) onto Attapulgite/UiO-66-NH2 Composites from Aqueous Solution

Peiyi Bao,Haiying Du,Xiangning Xu,Junya Li,Yao Wu,Shaojiang Zhou,Lingyun Li,Ningfei Lei

Fast Removal of Propranolol from Water by Attapulgite/Graphene Oxide Magnetic Ternary Composites

Yuehua Deng,Yani Li,Wenjie Nie,Xiang Gao,Lei Zhang,Pengli Yang,Xiaochun Tan

In this work, a novel adsorbent attapulgite/graphene oxide magnetic composite (ATP/Fe3O4/GO) was synthesized for removing propranolol (PRO) from aqueous water. The factors affecting the PRO adsorption process onto ATP/Fe3O4/GO including pH, ionic strength, sorbent dosage, and humic acid were systematically investigated by batch experiments. Meanwhile, magnetic attapulgite (ATP/Fe3O4) and magnetic graphene oxide (GO/Fe3O4) were prepared for the comparison of the adsorption performance for PRO. The structural and surface characteristics of the resulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements, and scanning electron microscope. The results showed that the adsorption rate of PRO onto ATP/Fe3O4/GO was up to 99%, faster and higher than that of other adsorbents involved at neutral pH. Moreover, the adsorption kinetics were better fitted with pseudo-first-order kinetic model than the second-order kinetic model. The adsorption data were fitted well with the Freundlich isotherm equations, implying that the adsorption process was heterogeneous. The adsorption reaction was endothermic and spontaneous according to the thermodynamic parameters. All results indicated that ATP/Fe3O4/GO was a promising adsorbent for removing PRO from water.Keywords:attapulgite;propranolol;graphene oxide;adsorption;magnetic materials

Functionalized Attapulgite for the Adsorption of Methylene Blue: Synthesis, Characterization, and Adsorption Mechanism

Zhifang Zhang,Wenjun Gui,Jia Wei,Yanjun Cui,Ping Li,Zhilong Jia,Peng Kong

Attapulgite (denoted as APT, also called palygorskite) has been regarded as the green material in the “21st century world” and has attracted widespread attention due to its advantages of low cost, natural abundance, nontoxic nature, and environmental friendliness. However, the limited adsorption sites and surface charges of natural APT greatly hinder its application as an adsorbent in industrial fields. In this work, natural APT was modified with sodium humate (SA) via a facile one-step hydrothermal process to improve its adsorption capacity and systematically studied its ability to remove methylene blue (MB) from aqueous solutions. The effect of hydrothermal modification in the presence of SA on the microscopic structure, morphology, and physicochemical properties of APT was studied by field-emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction, and Brunauer–Emmett–Teller analyses. The adsorption properties of the modified APT toward MB were evaluated systematically. The results demonstrated that the modified APT has a high adsorption capacity of 227.27 mg/g and also shows a high removal rate up to 99.7% toward MB in a dye solution with an initial concentration of 150 mg/L, which was a 64.7% increase as compared to that of raw APT. The adsorption kinetics could be fitted to the pseudo-second-order model, while the adsorption isotherm could be well-described with the Langmuir model. It was concluded that electrostatic attraction, hydrogen-bonding interaction, and chemical association are the main driving force during the adsorption process.

Preparation and thermophysical properties of three-dimensional attapulgite based composite phase change materials

Yi Wang,Ziyi Qin,Ting Zhang,Deyi Zhang

Aiming to reveal the relationship between the thermophysical properties of shape-stabled phase change materials (PCMs) with the structure of its matrix, a series of stearic acid/three-dimensional attapulgite (SA/TATP) composite PCMs were fabricated by vacuum impregnation method using TATP as matrix, which prepared via “grafting from” method and employed attapulgite (ATP) as raw material, diphenylmethane diisocyanate (MDI) as modifying agent and amines as linking molecules. The structure of carriers, thermophysical properties of the composite PCMs were analyzed, and the relationship between the thermophysical properties of SA/TATP and characteristics of the carrier were also studied. The results indicated that the thermophysical properties of the composite PCMs were improved significantly due to the introduce of organic bonding agents and the formation of three-dimensional network in the matrix. The latent heat of SA/TATP can be up to 136.81 J/g without leakage, and the maximum thermal conductivity of SA/TATP is 0.4215 W/m•K. The melting temperature and melting latent heat of the composite PCMs degenerate with the decrease of the pore size of the carriers. The relationship between the melting phase transition temperature, melting latent heat of SA/TATP and pore size of TATP can be descripted by the Gibbs–Thomson equation. In addition, the melting enthalpy of SA/TATP is positively associated with the grafting rate of the carrier.

Incorporating attapulgite nanorods into graphene oxide nanofiltration membranes for efficient dyes wastewater treatment

Cai-Yun Wang,Wen-Juan Zeng,Ting-Ting Jiang,Xi Chen,Xiao-Liang Zhang

Graphene oxide/attapulgite (GO/APT) composite membranes were successfully fabricated by the vacuum-assisted filtration for efficient dyes wastewater treatment. By characterization of FTIR, XPS, Raman, XRD and FESEM, APT nanorods were confirmed to be incorporated into GO laminar layers via grafting modification, which would influence GO interlayer distance ( d -spacing), membrane surface microstructure (laminate morphology, structure, and hydrophilicity) and even water separation performance. Comparison of those of pristine GO membrane, the calculated d -spacing of GO/APT membranes gradually increased from 0.90 nm to 1.07 nm, while water contact angles decreased from 71.0° to 43.3° with the increasing APT/GO ratios. Moreover, GO/APT membranes exhibited rough hierarchical microstructure and higher surface hydrophilicity, which was in conjunction with larger interlayer spacing to synergistically improve separation performance. The water permeated flux increased from 3.4 of pristine GO membrane to 13.3 L m −2  h −1 of GO/APT membrane with preserving high rejection nearly to 100% for 7.5 mg L −1 Rh B wastewater under optimized conditions. Similarly, membrane thickness, dye concentrations and separating species in feed solutions were also found to affect membrane separation performance. Dye molecules were efficiently rejected through GO/APT nanofiltration membranes by the synergistic separation mechanism: size exclusion effect because of the unimpeded water channels formed into 3D network laminate structure, and electrostatic interactions between the oxygen-containing functional groups on membrane surface and charged molecules. Such these GO/APT membranes demonstrated efficiently separation properties and thus provided new insight into the potential applications in water purification and dyes wastewater treatment.

Polystyrene/attapulgite nanocomposites prepared via in situ suspension polymerization with redox initiation system

Haicun Yang,Liu Zhang,Wenzhong Ma,Hongting Pu,Fanghong Gong

A series of polymer–clay nanocomposites consisting of polystyrene (PS) and attapuglite (ATP) were prepared successfully. First, silane coupling agent containing aromatic tertiary amine groups was synthesized to functionalize ATP (M-ATP). Then, PS nanocomposites with varied clay loadings were prepared via in situ suspension polymerization process with a redox initiation system consisting of aromatic tertiary amine and benzoyl peroxide. The synthesis of silane coupling agent and functionalization of ATP were confirmed by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectra, and X-ray photoelectron spectroscopy. Mechanical properties, morphology, thermal stability, and rheological behavior of nanocomposites were investigated to illuminate the effects of M-ATP on the structure and properties of nanocomposites. Field-emission scanning electron microscope images revealed an ideal dispersion of M-ATP and an enhanced toughness of nanocomposites. The improved interface interaction between M-ATP and PS matrix endowed the nanocomposites with outstanding mechanical properties and thermal stability. The formation of hybrid network in the nanocomposites containing 3 wt % M-ATP resulted in higher complex viscosity (η*), storage modulus ( G ′), and lower loss factor (tanδ) compared with the pristine PS and PS/ATP nanocomposites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41567.

α-Fe2O3/Attapulgite-mediated reaction of benzyl chloride: Synthesis of poly(phenylene methylene)

Dao-Guang Teng,Xian-Yong Wei,Zheng Yang,Zhi-Min Zong

Thermostable and fluorescent poly(phenylene methylene) (PPM) was synthesized via α-Fe 2 O 3 /attapulgite (α-Fe 2 O 3 / A )-mediated polymerization of benzyl chloride (BC) in CCl 4 in good yields. A carbocationic mechanism was proposed based on the controlling experiment. The structure and properties of PPM were characterized by Fourier transform infrared spectrometry, 1 H and 13 C nuclear magnetic resonance spectrometry, thermogravimetric analysis, elemental analysis, gel permeation chromatography, and UV–vis and fluorescence spectrometry. The results show that PPM possesses outstanding homoconjugation fluorescence and excellent thermal stability with onset decomposition temperature of ca. 420 °C. Recycled α-Fe 2 O 3 / A proved to be still highly active for BC polymerization. Moreover, the strategy features low-cost and readily accessible starting materials, simple one-pot operation, and recyclable catalyst, facilitating future applications. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 2280–2285

Porous Attapulgite Interfaces with Nanochannels That Enable Dendrite-Free Aqueous Zinc Ion Batteries

Dongfei Sun,Dandan Yu,Sen Lin,Zijuan Wang,Fangfang Deng,Xiaozhong Zhou,Guofu Ma,Ziqiang Lei

Aqueous zinc ion batteries (AZIBs) are promising for energy storage due to their high specific capacity and high safety. Unfortunately, uneven Zn dendrite growth and corrosion limit their further application. Herein, we demonstrate a cost-effective porous attapulgite nanorod protective layer to endow Zn anodes with dendrite-free Zn stripping/plating. The porous attapulgite coating serves as an artificial protective layer, which not only provides multiple nanochannels to homogenize the Zn2+ flux for uniform Zn stripping/plating but also improves the hydrophilicity favoring electrolyte infiltration and fast Zn2+ transport. In consequence, the ATP-Zn anode displays significantly reduced charge transfer resistance. Symmetric cells based on the ATP-Zn anode exhibit long cycling stability of 1600 h with a small voltage hysteresis of 40 mV at 0.25 mA cm–2, much better than that of the bare Zn anode. The ATP-Zn anode also displays a high Coulombic efficiency of 98% and a lower nucleation overpotential in half-cells. When compared with the typical β-MnO2 cathode, the ATP-Zn//MnO2 cell exhibits good cyclic stability. The reversible capacity of the ATP-Zn//MnO2 cell is 210 mAh g–1 after 300 cycles at 1C, while the capacity of the Zn//MnO2 cell is only 107 mAh g–1. This work provides an eco-friendly and facile strategy to upgrade the electrochemical stability of AZIBs.