SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Henan Peng,Hongru He,Pan Chen,Ke Zhang,Chunhai Chen,Daming Wang
Zinc oxide nanoparticle-loaded attapulgite was successfully added to the polyamide layer for the preparation of high-efficiency organic solvent nanofiltration membranes. The addition of zinc oxide nanoparticle-loaded attapulgite to the aqueous monomer regulates the diffusion rate of interfacial polymerization, generating a thin and loosely packed polyamide layer. In addition, the abundant hydrophilicity of the nanoparticles lays the foundation for increased polar solvent permeation. The organic solvent nanofiltration membrane with the best performance exhibited an optimum methanol permeability of 13.19 L m −2 h −1 bar −1 , which was 1.54 times higher than that of the unadded membrane. Meanwhile, the optimum membrane consistently rejected more than 99.40 % of Evans blue dye, and the rejection rates of different dyes were consistent with the size-sieving effect. Furthermore, the permeation capacities of the membranes were evaluated using organic solvents with different polarities, viscosities, and molecular diameters, and the permeability of acetonitrile reached 16.98 L m −2 h −1 bar −1 . In addition, the optimum membranes retained excellent rejection capacity after soaking in the strongly polar solvent N, N-dimethylformamide (DMF) for 10 days at room temperature.
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Russian Journal of Physical Chemistry A
·
2024
·Vol. 98
·期 9
·2135-2145
·
IF 0.7
Wenjie Liu,Ding Xiang,Liu Jingwei,Meng Jie,Li Xiazhang,Gao Bingying,Zuo ShiXiang,Yao Chao,Xue Bing
Abstract The composites (SiO 2 /HATP) were prepared by condensation reflux and high-temperature calcination using natural attapulgite and silica particles, and it was utilized for the adsorption of toluene. The physicochemical properties of the composite adsorbents were characterized using XRD, FT-IR, SEM, and BET techniques. The SiO 2 /HATP composite material was successfully prepared, with silica particles uniformly loaded onto the surface of ATP. The adsorption performance of the composite materials for toluene was investigated using different feed ratios. The results showed that the composite materials with the mass ratio SiO 2 /ATP equal to 4 exhibited the highest static adsorption capacity for toluene, reaching 236 mg/g. Additionally, dynamic adsorption performance of toluene was evaluated under conditions of 0 and 80% relative humidity, with corresponding breakthrough times of 90 and 36 min, respectively. The adsorption capacity of the composite materials for toluene was 6–8 times higher than that of pure attapulgite clay. Furthermore, the adsorption mechanisms of the composite materials were investigated through adsorption kinetics, adsorption isotherms, and adsorption thermodynamics. The results indicated that the adsorption of toluene by the composite materials followed a pseudo-first-order kinetic model and Langmuir adsorption isotherm, suggesting a spontaneous exothermic physical adsorption process at a monolayer level. Moreover, regeneration experiments were conducted, and after 5 cycles of adsorption-desorption tests, the composite materials maintained a penetration time of 85 and 30 min for toluene under conditions of 0 and 80% relative humidity, respectively, demonstrating good recyclability.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Xinjie Liu,Shujun Zhou,Yunpeng Ma,Xiaoli Gu
A promising route is established to produce a liquefied cellulose-based epoxy resin via phenol-catalyzed liquefaction, glyoxal cross-linking, and epoxidation. To simultaneously enhance flame retardancy and mechanical strength, attapulgite (ATP) was organically engineered with a phosphorus–silicon coupling agent (KH560–DOPO) to create a hybrid filler (AKD). The incorporation of 6 wt% AKD enabled the composite to achieve a UL-94 V-0 rating and a high limiting oxygen index (33.1%), while tensile strength and elongation at break increased by 36.7% and 24.1%, respectively. The analysis confirmed the successful liquefaction of cellulose and the covalent grafting of phosphorus and silicon onto ATP. The AKD/LCP composite material has a synergistic flame retardant mechanism of condensed phase and gas phase. The synergistic P–Si–C framework effectively promoted char formation and reinforced the polymer network. This work demonstrates a scalable route to stabilize renewable cellulose into high-performance epoxy resins, combining bio-based chemistry with advanced flame-retardant nanotechnology and providing new ideas for the development of fire-resistant polymeric materials.
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POLYMER
·
2022
·
IF 4.432
Yajie Li,Haicun Yang,Azita Ahmadi,Aziz Omari,Hongting Pu
Multilayer separators are widely used due to their wide shutdown window by combining lower melting temperature and higher melting temperature of different layers. With the development of high power lithium-ion batteries, multilayer separators equipped with effective thermal stability and flame retardancy are highly required. Herein, the poly(methyl methacrylate) modified attapulgite (ATPM) is selected as the heat resistant reinforcing component and blended with polypropylene (PP)/polyethylene (PE) respectively. Then we prepare PP(ATPM)/PE(ATPM) separators via multilayer coextrusion efficiently without multiple stretching processes, which can avoid serious separator shrinkage at elevated temperature. The intertwined ATPM could not only enhance the separator integrity, but also produce water vapor and oxide anti-flaming isolation layers at high temperatures. The as-prepared separators, referred to as MC-TIPS PP/PE/ATPM, exhibit higher thermal stability (with negligible dimensional shrinkage up to 180 °C), better flame retardancy and wider shutdown temperature window (124–183 °C) than the commercial multilayer separators. Moreover, the introduction of ester and hydroxyl groups could improve the wettability and electrolyte uptake of the separators. These properties, as well as the potential for large-scale production of multilayer coextrusion, make MC-TIPS PP/PE/ATPM an ideal choice for high-power battery separators.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 82
·期 3
·702-711
·
IF 1.575
Li Jie,Lei Yu,Xu Dingding,Liu Fenghua,Li Junwan,Sun Aihua,Guo Jianjun,Xu Gaojie
Abstract To overcome the brittleness and the dry shrinkage of silica aerogels, natural attapulgite nanofiber is successfully used as reinforcement for monolithic silica aerogel composites possessing ultralow density and excellent thermal insulation properties. The attapulgite/silica aerogel composites are obtained by dispersing the acid-treated attapulgite fibers in silica sol, followed by aging and ambient pressure drying. The acid treatment of attapulgite fibers obviously improved the adhesion between silica aerogel and attapulgite fibers surface. The microstructure analysis showed that silica particles firmly adhered to the surface of the rod shaped crystal of attapulgite fibers, which played a supporting role as structure skeleton and substantially improved the integrity and mechanical strength of the aerogel composites. No obvious variation of the mesoporous silica structure was observed since the nanosized attapulgite fibers are effectively incorporated into the network, instead of separated into small fragments as pure aerogel shown. As the fiber content increased, the density decreased to 0.163 cm 3 /g first and then increased, while the thermal conductivity increased slightly with ranging between 0.0198 and 0.0228 W m −1 K −1 . The aerogel samples with compression strength varying from 0.8 to 2.5 MPa were obtained. All these promising characteristics indicated that ATP/silica aerogel composites have diverse applications, especially in heat preservation field. Graphical Abstract
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Green Synthesis and Catalysis
·
2023
·
IF 0
Jia Zhang,Jian Yang,Xuemei Li,Bin Mu,Hailong Liu,Chungu Xia,Aiqin Wang,Zhiwei Huang
The efficient synthesis of useful primary amines via reductive amination of biomass-based aldehydes and ketones over earth-abundant base metal catalysts is an attractive biomass value-adding technology yet facing lots of challenges. Herein, natural attapulgite (ATP) was applied as support for the fabrication of active Ni catalysts with different Ni loadings (5–30 wt%) by the deposition-precipitation method. The Ni/ATP-550 catalyst with 10–15 wt% Ni loadings was found to present the highest catalytic performance for the synthesis of valuable 5-amino-1-pentanol (5-AP) via reductive amination of biofurfural-derived 2-hydroxytetrahydropyran among a variety of commonly used oxide supports loaded Ni catalysts, as well as ATP supported nickel catalysts with other loadings, achieving 5-AP yield up to 94%. The intrinsic activity of the Ni/ATP catalysts was found to depend strongly on the Ni 0 crystallite size and Ni 0 fraction of the catalysts, which generally increased with increasing Ni 0 crystallite size and fraction, owing probably to the hydrogenation of imine intermediate is a structure-sensitive reaction. The efficient 10Ni/ATP-550 catalyst also exhibited good activity and stability in the reductive amination of several other biomass-derived aldehydes and ketones to their corresponding primary amines with good to excellent yields (81%–99%). This work provided a clean and efficient natural ATP-supported non-noble metal nickel-based catalytic system for the reductive amination of aldehydes and ketones to synthesize high-value-added primary amines, which could be a promising candidate for the industrial production of amines.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 137
·期 2
·47298
·
IF 1.901
Wei Hou,Yifan Fu,Cen Zeng,Na Liu,Cuiyu Yin
In this study, the nanocomposites are prepared which used polyamide 6 (PA6) composite as matrix, melamine cyanurate (MCA) as fire retardant and attapulgite (AT) as synergistic agent. The mathematical model between MCA content, AT content, and limited oxygen index (LOI) is established by multiple linear regression fitting. The polymer materials are characterized using Fourier transform infrared spectroscopy, X-ray diffraction, Thermogravimetric Analysis, and scanning electron microscopy. Through response surface methodology, the important variables (polymerization time, the content of MCA, and the content of AT) affecting the mechanical strength of composites are modeled. Results demonstrate that when the t is 0.6 h, the AT content is 6.2%, and the MCA content is 11.5%, the mechanical properties of the PA6/MCA/AT composite are up to 44.81 MPa, and the sample passes the UL-94 V-0 flammability rating, and the LOI reaches 27.9%. Therefore, polymers with highly effective flame retardancy and optimal mechanical properties are prepared. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 47298.
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SOIL & TILLAGE RESEARCH
·
2026
·
IF 8.4
Zunqun Zhu,Miaomiao Yu,Peiyun Gong,Jing Zhou,Huiting Song,Jun Zhou
Novel amendment triggers in-situ CaAl-LDH formation, rapidly immobilizing soil alkalinity and carbonate. • Rapidly reduces soil pH by 2.7 units and carbonate by 83%, while cutting exchangeable Na⁺ by 76%. • Soil structure improves significantly, increasing macroaggregates 17-fold and organic matter stability by 33%. • Immediate planting is enabled, boosting pakchoi height 218% and fresh weight 70% in pots. Soda saline-alkali soils pose a severe threat to agricultural productivity due to high pH, elevated carbonate (CO 3 2 − ) concentration, and poor soil structure. However, achieving rapid alkalinity reduction and long-term stability of immobilized salts remains a significant challenge in soil remediation. This study developed a novel composite amendment comprising calcium sulfate (CaSO 4 ,), aluminum sulfate (Al 2 (SO 4 ) 3 ), and attapulgite clay (ATP) to induce the in-situ formation of CaAl-layered double hydroxides (CaAl-LDHs) for the efficient remediation of soda saline-alkali soils. Through a 150-day mineralization experiment, the amendment rapidly triggered the formation of crystalline CaAl-LDHs, confirmed by XRD, SEM, TEM, FTIR, and XPS analyses. This process effectively immobilized free CO 3 2− and hydroxyl (OH − ) into the LDHs interlayers, resulting in a significant reduction in soil pH from 10.6 to 7.9 and CO 3 2− concentration by 83%. The treatment also reduced exchangeable Na⁺ by 76% and decreased water-soluble Ca 2+ , Mg 2+ , Al 3+ , and Fe 3+ concentrations. Importantly, soil structure was markedly improved, with macroaggregates (> 1 mm) increasing by 17 folds, and soil organic matter (SOM) stability enhanced by 33% due to increased organo-mineral associations and Fe/Al oxide concentration. A pot experiment with pakchoi further validated the amendment’s practicality, which significantly improved seedling germination, increased plant height by 218%, and boosted fresh weight by 70%, while concurrently lowering post-harvest soil pH and salinity. This study presents a rapid, stable, and synergistic strategy for sustainable saline-alkali soil remediation based on in-situ LDHs mineralization, offering a promising solution for improving soil health and crop productivity. Download: Download high-res image (289KB) Download: Download full-size image
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2026
·Vol. 81
·期 4
·664-671
·
IF 1.5
Huang Yinuo,Wu Shuaibin
In this study, the surface covalent reaction method was adopted to modify attapulgite on the surface of polypropylene adsorption membranes for the adsorption of small molecular compounds. Compared with various materials currently modified on the surface of polypropylene adsorption membranes, attapulgite has the characteristics of low cost and environmental friendliness, which is more conducive to large-scale practical application. The prepared polypropylene adsorption membrane modified with attapulgite was characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffractometry, etc. The experimental results showed that attapulgite was successfully modified on the surface of the polypropylene adsorption membrane. The subsequent adsorption experiment results indicated that within 1 min, the adsorption capacities of chlorophenol and Congo red by the polypropylene adsorption film modified with attapulgite could reach 6 and 3 mg/g, respectively; the minimum detectable concentration could reach 0.02 mg/mL, with a relative standard deviation of about 12.7%.
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CLAY MINERALS
·
2026
·
IF 2.1
Huan Zhang,Hang Lu,Zhihui Mao,Zongyang Liu,Siyuan Wang,Wenbo Wang
Low-grade attapulgite clay intergrowths, composed mainly of attapulgite, illite, calcite and quartz, are abundant. The intimate intergrowth among these phases buries active surfaces under inert components, limiting performance and hindering value-added utilization. Herein, a multi-scale structural regulation strategy was employed. Sieving and water washing removed inert components for compositional regulation. High-speed shearing and ultrasonic treatment broke soft agglomerates and exposed active surfaces, achieving aggregation state regulation. Controlled thermal treatment removed channel water, activated exchangeable sites and enhanced negative surface charge, thereby regulating structural and surface chemistry. These steps progressively modified the material from its macroscopic composition down to its atomic-level surface properties. After the regulation, Pb2+ adsorption capacity increased from 153.1 to 237.5 mg g–1. The material remained effective even at pH 1 and reduced Pb2+ from 1000 to 0.83 μg L–1, well below the World Health Organization (WHO) guideline of 10 μg L–1. X-ray diffraction, X-ray photoelectron spectroscopy and quantitative cation release analysis were performed to elucidate the adsorption mechanism. Ion exchange dominated by Ca-rich mineral serves as the primary pathway. Cation exchange on silicate surfaces, forming PbSiO3, provides a key supplementary contribution. Electrostatic attraction and in situ precipitation participate synergistically. This work establishes a theoretical foundation and offers a reagent-free, industrially feasible route for the value-added utilization of low-grade intergrown clay resources in environmental remediation.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 5
·1779-1786
·
IF 4.831
Li Huihui,Zhu Shuqiang,Cheng Ting,Wang Shuxia,Zhu Bin,Liu Xiaoyan,Zhang Haixia
Boronate affinity materials have been widely used for selective capture of cis-diols such as nucleosides. Adsorbents with features of low binding pH and high adsorption capacity are highly desired. However, most reported materials only possess one of the two features. We have synthesized a 1,3,5-triazine-containing binary boronic acid by reacting cyanuric chloride with 3-aminophenylboronic acid, and the product was then grafted onto attapulgite (a fibrous aluminum-magnesium silicate). The resulting functionalized attapulgite exhibit low binding pH (5.0) and display high adsorption capacity (19.5 ± 1.1 mg⋅g −1 for adenosine). The material exhibits high selectivity for cis-diols even in the presence of a 1000-fold excess of interferences. It was applied to the selective extraction of nucleosides from human urine. Typical features of the method include (a) limits of detection in the range from 4 to 17 ng⋅mL −1 , (b) limits of quantification between 13 and 57 ng⋅mL −1 , (c) relative standard deviations of ≤9.1 %, and (d) recoveries of nucleosides from spiked human urine between 85.0 and 112.9 %. In our perception, the material and method offer a promising strategy for selective capture of cis-diols in the areas of proteomics, metabolomics and glycomics.
We have prepared 1,3,5-triazine-containing binary boronic acid-functionalized attapulgite. The material exhibited low binding pH (5.0) and high adsorption capacity (19.5 ± 1.1 mg⋅g‾ 1 for adenosine).
研究领域:
生物化学
·
分析化学
·
材料科学
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-12
·
IF 2.9
Khatun Most Munera,Islam Ashraful,Yan Chunjie,Nesa Most Jinnatun
A nano-ZnO semiconductor material loaded with mineral attapulgite (ATP) photocatalyst has been investigated. Using ATP as a carrier, a variety of various mixtures of ZnO/ATP composites was synthesized. A scanning electron microscope (SEM), X-ray diffractometry (XRD), and UV-Vis spectrophotometer (UV-Vis) were used to examine the morphology, synergistic effects, and photocatalytic properties of ZnO/ATP nanocomposites. The target pollutant for photocatalytic degradation is methylene blue solution. When ATP is mixed with pure ZnO, the degrading performance of composite nanomaterials in methylene blue solution is considerably enhanced. The degree of methylene blue degradation increases as the amount of ATP in the composite grows, and the degradation rate of ZnO/40% ATP can reach 96% in 45 min under solar light illumination. The amount of ATP in the system is excessive, and the adsorption effect is visible. The optimal composite ratio was determined to be ZnO/30% ATP. After discovering the ideal composite ratio and synergy of ZnO/ATP, g-C 3 N 4 was compounded in the aforesaid system, dramatically increasing the composite’s photocatalytic activity. At 45 min, the degradation rate of methylene blue reaches 97%. The absorption range and intensity of ternary composites increased, and the photogenerated electron-hole recombination rate decreases significantly. The reaction rate constant increases from 0.033 to 0.069 min −1 . SEM revealed rod-like attapulgite particles packed with tiny zinc oxide particles and a moderate layered structure of C 3 N 4 . The XRD pattern indicated that C 3 N 4 ’s crystallinity is poor and ZnO’s peak intensity is excessively high, masking the composite material’s distinctive peaks. The degradation rate of g-C 3 N 4 /ZnO/30% ATP to methylene blue was found to be 91.5% after 5 cycles.
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