APPLIED CLAY SCIENCE
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2019
·
IF 3.89
Yi Wang,Yanhui Song,Shuang Li,Ting Zhang,Deyi Zhang,Pengran Guo
In order to enhance the loading capacity of palygorskite (Pal) and further understand the relationship between pore size of carrier and thermal properties of mineral-based phase change materials (PCMs), series of three-dimensional palygorskite carriers and corresponding composite PCMs (CPCMs) were fabricated. The morphology, structural characteristics and thermal properties of the support and composite PCMs were determined by various techniques. The effects of support microstructure on the thermo physical properties of CPCMs were also discussed. The results revealed that the isocyanate functionalized palygorskite can be covalently bonded by dihydric alcohol to form three-dimensional Pal-based carrier. The pore diameter of the carrier varies with the chain length of dihydric alcohol. Since covalent bonding and surface functionalization can prevent the agglomeration of palygorskite crystals, thermal energy storage performance of stearic acid/three-dimensional palygorskite is increased by 67.4% to 100.7% within the scope of the study compared with that of stearic acid/palygorskite. The phase change temperature and latent heat of the composite phase change material have a linear correlation with pore size of support. This study is expected to be helpful for designing mineral-based porous carrier and providing guidance for optimizing CPCMs.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Hui-Ran Jin,Xin-Yu Zhou,Yong Zhu,Guo-Fan Sun,Shi-Jie Ding,Jing Chen
In this paper, non-aqueous Fe(OH) 3 /palygorskite dispersion was prepared and its liquid crystal phase behavior was investigated. Positively charged Fe(OH) 3 colloidal particles were put in to non-aqueous and organically modified palygorskite dispersion. The effects of organically treated palygorskite and Fe(OH) 3 on the preparation of stable palygorskite dispersion were characterized with FT-IR, XRD , Contact Angle measurement , Zeta potential detection, Settlement measurement and SEM , respectively. The addition of Fe(OH) 3 particles shifted the concentrations of the coexisting isotropic and nematic phases to higher values while at the same time markedly accelerated the phase separation. The influence of Fe(OH) 3 particles on the dispersion in magnetic field was also discussed.
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高影响因子
APPLIED CLAY SCIENCE
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2017
·
IF 3.101
Jianxi Zhu,Ping Zhang,Yuebo Wang,Ke Wen,Xiaoli Su,Runliang Zhu,Hongping He,Yunfei Xi
In this paper, acid-activated palygorskite (APal x ) samples were prepared by a facile acid treatment method with different concentrations of HCl (0.5, 1, 3, 5 and 7 mol/L). The dynamic toluene adsorption performances of APal x were evaluated and the relevant adsorption mechanism was discussed. The prepared adsorbents were characterized using X-ray diffraction (XRD), elemental analysis, transmission electron microcopy (TEM), nitrogen adsorption-desorption isotherms and Fourier-transform infrared spectroscopy (FTIR). The results show that the palygorskite has a good resistant ability to acid attack, the structure still remains when the acid concentration is as high as 7 mol/L. Acid activation could significantly enhance the surface area (228, 250, 271, 273, 329 and 308 for Pal, APal0.5, APal1, APal3, APal5 and APal7, respectively) and porosity of palygorskite. APal5 has the best toluene adsorption capacity (90.4 mg/g) due to its highest S BET (329 m 2 /g) and V micro (0.055 cm 3 /g). The adsorption performance in terms of dynamic toluene adsorption capacities follows the order of Pal (44.6 mg/g) < APal0.5 (63.5 mg/g) < APal1 (71.3 mg/g) < APal7 (74.2 mg/g) < APal3 (75.1 mg/g) < APal5 (90.4 mg/g). APal5 can be readily regenerated by thermal desorption and has exhibited steady reproducibility after 6 cycles. These results have demonstrated that acid activation is a feasible and effective method for the structure and surface optimizing of palygorskite, enabling the APal x to become a promising candidate for the adsorption of volatile organic compounds in practical applications.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Huiran Jin,Xinyu Zhou,Yingtong Liu,Weijie Sun,Shuchao Song,Shan Yun,Guofeng Guan,Jing Chen
It is a challenge to develop high-efficiency, easy-recyclable adsorbents for the removal of dyes from environmental waters. Herein, we report the construction of two types of palygorskite (Pal)-polymer aerogels with distinctive hierarchically meso − microporous structure, which different polymer species-sodium alginate (SA) and chitosan (CS) through the sol-gel method, cross-linking, and freeze-drying, for the removal of dye pollutants from water. A hierarchical porous structure of aerogel accelerates the diffusion of dye water. Notably, this developed strategy enables selective dye adsorption by tuning the polymer and component contents in the Pal-polymer aerogel. Indeed, the maximum adsorption capacity of the Pal-SA composite aerogel for malachite green (cationic) dye reached 2008 mg/g and that of the Pal-CS(Fe 3+ ) composite aerogel for sunset yellow (anionic) reached 976 mg/g. In addition, the composite aerogels can be regenerated many times without significant loss of effectiveness. This work provides a new concept and strategy for dye waste-water treatment.
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高影响因子
FIBERS AND POLYMERS
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2020
·Vol. 21
·期 9
·1888-1893
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IF 1.797
Mao Yu,Ni Lingli,Yang Changyou,Cai Peng,Du Weigang,Gao Xiaoyan
Palygorskite (PAL) is a natural fibrous clay mineral which attracted tremendous attention as reinforcing agent to polymers. In this paper, a facile and environmental friendly modification process of PAL by poly acrylic acid (PAA) via in-situ polymerization in PAL/water gel has been reported. The effects of PAA modified PAL (PAA-PAL) on the mechanical and thermal properties of waterborne polyurethane (WPU) nanocomposites have been investigated. Scanning electron microscopy (SEM) demonstrated that the dispersion of PAL has improved dramatically after PAA modification. Tensile tests showed that PAA-PAL has a significant reinforcement effect on WPU matrix. Addition of 10 wt% PAA-PAL, the tensile strength and the Young’s modulus of WPU composites increased 235 % and 388 %, respectively. Furthermore, the thermal stability of WPU also has been distinctly improved via addition of PAA-PAL.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Yueyue Yang,Weidong Liang,Chengjun Wang,Hanxue Sun,Jianli Zhang,Yuan Yu,Wenrui Dong,Zhaoqi Zhu,An Li
With the rapid development of industrial growth, the issue of severe water pollution risen from oily waste water, dye waste water, and frequent oil spill accidents has become a bottleneck for hindering the global sustainable development. Herein, we report the facile fabrication of a superhydrophilic/underwater superoleophobic multifunctional separation membrane by vacuum assisted filtration technology using palygorskite (Pal) as raw material. The Pal coated membrane show excellent thermal， chemical stability, and mechanical strength with 300 bending times. As expected, the membrane has excellent separation performance, e.g. it exhibits an enhanced permeation flux of 477.7 ± 5.0 L m −2 h −1 bar −1 and a high separation efficiency of up to 99.6% ± 0.05%. In addition, it can separate different oil-in-water emulsions in harsh environments. Interestingly, the as-prepared membrane can also remove organic dyes in the water phase during the separation process, making it multifunctional and promising membrane for water treatment , by combination with its simple and cost-efficient manufacture, excellent physicochemical properties . More importantly, our work may also open a new way for high-increment utilization of palygorskite mineral with a “green” method.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Dafan Chen,Aiqin Wang,Yiming Li,Yajie Hou,Zhining Wang
An effective and conventional remediation technique in marine oil spills is to apply chemical dispersants to emulsify oil slicks into small oil droplets. Still, the potential hazards of chemical dispersants onto the marine ecosystem have motivated the research for environmentally friendly alternative while keeping exceptional dispersion ability. Here, we showed that the mixture of palygorskite (PAL) and rhamnolipid (Rha) formed a biocompatible alternative to synthetic surfactants used for oil spill dispersion. The oil droplets dispersed by R-PAL presented a small average size and long-term stability, which illustrated the synergistic interactions between Rha and PAL acting as an efficient dispersant in artificial sea water (ASW). Due to the strong flocculation caused by high salinity , PAL alone was not effective emulsifiers in ASW. A small amount of Rha could played a major role in modifying the surface characteristics of PAL and decreasing oil-water interfacial tension. Therefore, PAL particles irreversibly adsorbed onto the oil-ASW interface and formed a rigid interfacial film around oil droplets in the presence of Rha, which offered an efficient barrier to droplet coalescence. The synergistic interactions between PAL and Rha could enable the dispersion of tetradecane in ASW. Such a functionality was further tested in dispersing crude oil in ASW. The study presents a new strategy of using a mixture of PAL and Rha for oil dispersion, thus providing an ecofriendly alternative to conventional dispersants.
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PubMed
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Wenbo Wang,Wenkai Dong,Guangyan Tian,Luyi Sun,Qin Wang,Aiping Hui,Bin Mu,Aiqin Wang
A simple one-step hydrothermal acid-leaching process was employed to efficiently convert natural Pal to porous silica nanorods with a high SiO 2 content and decent length of nanorods. At a lower acid concentration (2.0 mol/L), silica nanorods with the SiO 2 content of 97.84% and a rod length equal to original length of Pal nanorods were obtained by this process; while only the products with lower SiO 2 content of 79.92% were obtained by a normal acid-bleaching process. Although increasing acid concentration to 8.0 mol/L may enhance SiO 2 content to 94.56% in normal acid-leaching process, which led to sharp reduction of length of nanorod. The synthesized porous silica nanorods have a specific surface area of 119.39 m 2 /g, average pore size of 7.56 nm, and better whiteness (the L *, a * and b * values are 86.130, 0.131 and 2.801, respectively). This paper provided an effective, universal approach to produce silica nanomaterials from diverse natural clay minerals.
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高影响因子
APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Hong-wei Yu,Shan-shan Yang,Hui-min Ruan,Jiang-nan Shen,Cong-jie Gao,Bart Van der Bruggen
A polyacrylonitrile/palygorskite composite chemically modified with amidoxime groups was prepared by free-radical graft polymerization of acrylonitrile onto 3-glycidyloxypropyl trimethoxy silane (KH-560)-modified palygorskite and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Adsorption of uranium(VI) from simulated seawater on the material was investigated. Batch experiments were carried out to study the effects of initial pH, contact time, initial feed concentration and ionic strength on uranium removal. The solution pH values had a major impact on uranium(VI) adsorption with optimal adsorption observed around pH 5. The kinetic data followed the pseudo second-order process. The equilibrium data fitted the Freundlich model well and the maximum adsorption capacity was found to be 78.13 mg/g. The ionic strength did not significantly affect uranium removal and chemisorption was assumed to describe the uranium adsorption. Desorption was performed using 0.1 M HCl solution, and the regenerated adsorbents could be reused with little loss of adsorption capacity after five cycles.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 13
·9416-9424
·
IF 3.84
Jia Lu,Wei Zhou,Jing Chen,Yeling Jin,Keisha B. Walters,Shijie Ding
Poly(2-(diethylamino)ethyl methacrylate (PDEAEMA) was grafted from the surface of palygorskite (PAL) particulates via Cu(0) radical polymerization to form PAL–PDEAEMA nanocomposites. The successful grafting was confirmed by Fourier transform infrared (FT-IR), thermal gravimetric analysis (TGA), and elemental analysis (EA). Water (pH 9)/toluene (W/O) Pickering emulsions stabilized by PAL–PDEAEMA particles were prepared. Spherical emulsion droplets with absorbed small PAL–PDEAEMA aggregates on the interface were observed via scanning electron microscopy (SEM), polarizing optical microscopy (POM) and optical microscopy (OM). The size of the emulsion droplets was decreased with the increase of PAL–PDEAEMA particle concentrations, and reached a limited value at 2 wt%. By changing the pH of water (pH < 3), O/W Pickering emulsions were formed by the same PAL–PDEAEMA particles. Moreover, W/O emulsion–de-emulsion–O/W emulsion transitions can be realized simply by adding HCl/NaOH, which can last at least 7 successive cycles. Therefore, a reversible Pickering emulsion system switched by pH can result on the basis of PAL–PDEAEMA particles.
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高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Chenguang Yang,Dale Xie,Sheng Wang
Herein, the palygorskite/polyaniline/ZnO (Pal/PANI/ZnO) nanocomposites were synthesized by using facile two-step solution method with palygorskite as a carrier. It was confirmed that the introduction of palygorskite can effectively prevent the free agglomeration of polyaniline shells and ZnO rods. Interestingly, the acquired ternary nanocomposites show excellent microwave absorption properties in multi frequency bands. Specifically, the optimized sample exhibits a minimum reflection loss (RL) value of −57.75 dB at 5.52 GHz in the C band, with an additional RL peak of −47.44 dB at 15.60 GHz at a thickness of merely 1.88 mm in the Ku band. Meanwhile, the effective absorption bandwidth (RL < - 10 dB) reaches 6.56 GHz in the range of 11.44–18.00 GHz at a thickness of 2.08 mm. Therefore, our results could contribute to the design of palygorskite based nanocomposites as the high-absorption and strong-bandwidth microwave absorbers.
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高影响因子
CLAY MINERALS
·
2026
·
IF 2.1
Xiaomei Wang,Yalong Li,Fangfang Yang,Bin Mu,Hongbin Zhao,Aiqin Wang
Rapid and efficient haemostasis is key to controlling bleeding and reducing mortality, and so it is necessary to design high-performance haemostatic materials. Here, haemostatic gauze composites were facilely prepared based on dopamine polymerization modification of gauze and simultaneous impregnation loading of mixed-dimensional palygorskite clay (MDPal). The haemostatic performance of gauze composites was systematically evaluated in comparison with a commercially available gauze impregnated with kaolin. The results confirmed that no obvious changes were observed regarding the water vapour transmittance and water absorption of the gauze after coating with polydopamine and MDPal. Blood coagulation studies indicated that the optimal gauze composites prepared with 200 mg of dopamine after reaction for 6.5 h presented superior haemostatic properties according to the in vitro blood-clotting index, the coagulation kinetics of platelet-poor plasma coagulation, erythrocyte adhesion behaviour and thrombus formation. The haemorrhage effects on rat liver bleeding suggested that the blood losses with the gauze composites were 8.52% and 29.45% less than that of the blank group. In addition, the coagulation time decreased by 38.12% compared with the blank group. Furthermore, the gauze composites exhibited good biocompatibility as evaluated by haemolysis rate and cytotoxicity assays. Thus, the obtained gauze composites can serve as promising candidates for rapid wound haemostasis.
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高影响因子
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