CLAYS AND CLAY MINERALS
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2023
·Vol. 70
·期 6
·809-823
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IF 2.2
He Qiuzhi,Chen Qingze,Zhu Runliang,Du Jing,He Shiya,Lv Guocheng,Gu Cheng,Wang Aiqin
Supported silver nanoparticles (Ag NPs) have been used extensively as antibacterial agents in biomedicine, biotechnology, and environmental remediation. However, a facile and scalable method for preparing Ag NPs dispersed homogeneously on supports remains a challenge. In this study, a novel molten salt method was developed successfully to synthesize the supported, homogeneously dispersed Ag NPs on palygorskite. Abundant pores and ample surface hydroxyl groups of palygorskite served as anchoring sites, preventing the rapid growth, aggregation, and sintering of Ag NPs. Typically, palygorskite was mixed with AgNO 3 (as a precursor) and NaNO 3 (as a dispersant), and then the mixture was heated slowly. During the heating process, the AgNO 3 decomposed gradually into Ag NPs and the molten NaNO 3 with a high concentration of ions dispersed the newly formed Ag NPs. The Ag NPs were dispersed homogeneously on the palygorskite and had very small particle sizes (~5.8 nm) even for a significant loading amount (~9 wt.%). As antibacterial agents, the Ag/palygorskite nanocomposites showed enhanced antibacterial activity, compared with those synthesized without the introduction of molten NaNO 3 . In addition, the key effect of the surface hydroxyl groups of palygorskite on the characteristics of the loaded Ag and the corresponding antibacterial activity were also elucidated. As such, the present work provided a novel and facile strategy for the synthesis, without a chemical reductant or surfactant, of supported, highly dispersed Ag NPs on clay minerals and this could have potential in the scalable production and practical application of Ag-based antibacterial materials.
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Colloid and Interface Science Communications
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2023
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IF 4.5
Aiping Hui,Fangzhi Duan,Yongfeng Zhu,Hao Yang,Aiqin Wang
The cinnamaldehyde has the enormous potential in the antibacterial fields, but the inherent volatility is the major weaknesses in practical application. Herein, a novel strategy of which to encapsulate cinnamaldehyde into Pickering emulsion was adopted. The Pickering emulsion was stabilized with particles of Sapindus mukorossi modified palygorskite ( Sm -Pal), and exhibited good pH and ionic strength resistance and storage stability, even in high salt environments. More importantly, the Pickering emulsion stabilized possessed enhanced antibacterial activities, the reduction (%) of Pickering emulsion toward Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ) and drug resistance bacteria-extended spectra of β -lactamases producing Escherichia coli (ESBL) and methicillin-resistant Staphylococcus aureus (MRSA) were 69.8%, 99.6%, 100% and 99.8%, respectively. This strategy could inspire novel designs for functional Pickering emulsions with efficient protective effect.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yunhe Li,Hua Li,Siyuan Jiang,Yuerong Zhou,Dongran Cao,Xinrong Che,Ying Yang,Jiangwei Shang,Xiuwen Cheng
Adsorption plays a critical role in eliminating antibiotics in wastewater, so it is urgent to develop an effective adsorbent in the application. Palygorskite exhibits enormous potential in the field of adsorption. In this study, palygorskite was modified by MnO x into a suitable and efficient adsorbent by a simple method, and they were used for the application and comparison of adsorbing fluoroquinolone antibiotics from aqueous solution. The surface chemical properties of adsorbents were characterized by different analytical techniques, and the results were used to analyze the corresponding adsorption interactions. Statistical physics calculations were performed to explain the physical and chemical parameters involved in FQs adsorption mechanism. The highest adsorption efficiency was achieved at pH 3, and the maximum adsorption capacities of MnO x @Pal for CIP, ENR, LFX and LOM were 51.48 mg · g −1 , 40.46 mg · g −1 , 55.16 mg · g −1 and 52.13 mg · g −1 , respectively. Antibiotics adsorption mechanism of adsorbent is mainly due to electrostatic interaction and hydrogen bonding. The adsorbent can be desorbed more easily using NaOH solutions. This adsorbent is expected to be used to treat wastewater contaminated by fluoroquinolone antibiotics.
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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Jingfang Zhang,Zilong Liang,Jingxuan Liu,Yange Wan,Xin Tao,Haijun Zhang,Mingchao Wang
Aiming to improve the fire resistance, the synergistic effects of palygorskite and expandable graphite (EG) on water-based intumescent fire retardant (IFR) coatings were investigated in details by fire resistance test, limiting oxygen index (LOI) test, vertical burning (UL-94) tests, thermogravimetry (TGA)-differential scanning calorimeter (DSC) test, and cone calorimeter test. The char residues were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller test (BET). The backside temperature of the substrate of sample 3-3 with 3 wt% of EG and 3 wt% of palygorskite addition (SP3-3) was recorded to be 150 °C after 120 min fire test, 46.5% lower than that of the sample 1 with no addition (SP1). The SP3-3 had the best fire retardant performance reflected by UL-94 V0 flammability rating and the LOI value as high as 35.8%. The TG-DSC analysis showed palygorskite can increase the thermal stability and decrease the decomposition rate of the coatings. The cone calorimeter test demonstrated SP3-3 remarkably reduce the value of peak heat release rate and peak smoke production release by 64.1% and 85.7%, respectively. The XRD analysis confirmed that the decomposition compounds of ammonium polyphosphate, fillers, and palygorskite can react and form a ceramic-like protective barrier, which enhanced the thermal stability and char yield. In addition, the SP3-3 had shown best results in char expansion and char morphology.
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APPLIED CLAY SCIENCE
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2022
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IF 5.907
Shuangjia Wang,Yun Shen,Xiuping Chen,Limei Dong,Hong Yu,Mutai Bao,Yiming Li
Based on the synergistic interaction between palygorskite (PAL) and cetyltrimethylammonium bromide (CTAB), Pickering emulsion gel was successfully prepared in this study in a wide range of oil volume fraction (15–75%). All prepared emulsion gels remained stable for more than 6 months at room temperature. The microstructure, stability, and rheological properties of the prepared emulsion gels were characterized and evaluated. The influence of various environmental factors, including temperature, pH, salinity and types of oil phase on the formation of emulsion gels were investigated. A series of characterization methods were used to investigate the formation and stabilization mechanism of Pickering emulsion gel. The reduction of interfacial tension between oil and water, the changed surface characteristics of PAL, and the formation of a three-dimensional network structure in the continuous phase contributed to the stabilization of Pickering emulsion gel. This work presents a new strategy for the preparation of Pickering emulsion gel by using easily obtained clay particles.
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npj Heritage Science
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2026
·
IF 0
Liu Junli,Zhu Ye,Yi Yunxiao,Liu Hui,Zhu Jianfeng,Wang Shuyu,Ma Tao,Tian Xuguang
Sandstone cultural heritage is vulnerable to acid rain and microbial colonization. This study develops a palygorskite-based multifunctional protective coating (Fluor@Ag + CuFePBA/Pal) for sandstone conservation. CuFePBA/Pal nanocomposites were synthesized via co-precipitation using palygorskite as a natural mineral carrier, followed by Ag⁺ introduction to yield light-colored Ag + CuFePBA/Pal with enhanced antibacterial activity through sustained release of metal ions and reactive oxygen species generation. Surface fluorination with PFDTES reduced surface energy while the nanofibrous microstructure created micro/nano-roughness, synergistically achieving superhydrophobicity (water contact angle 162°, sliding angle 18.1°, contact angle hysteresis 8.7°) and 99.9% bacterial anti-adhesion against both Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ). Simulated sandstone showed no microbial growth after 30 days. Accelerated aging tests and 12-month indoor exposure confirmed the coating’s long-term stability and durability in real preservation environments, establishing an effective strategy for protecting sandstone cultural heritage.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2020
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IF 2.627
Jiahong Wang,Tongtong Sun,Atif Saleem,Yao Chen
Polyethyleneimine (PEI) modified palygorskite (Pal) was used for the adsorption of Cr(VI) in aqueous solution. The absorbent was characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterized results confirmed that the Pal has been successfully modified by PEI. The modification of PEI increased the Cr(VI) adsorption performance of the Pal by the adsorption combined reduction mechanism, and amino groups of the adsorbent play the main role in the enhanced Cr(VI) adsorption. The maximum adsorption capacity was 51.10 mg·g −1 at pH 4.0 and 25 °C. The adsorption kinetics of Cr(VI) on the adsorbent conforms to the Langmuir isotherm model. The maximum adsorption occurs at pH 3, and then the adsorption capacity of PEI-Pal was decreased with the increase of pH values. The adsorption kinetics of Cr(VI) on PEI-Pal was modeled with pseudo-second-order model. The addition of Cl − , SO 4 2− and PO 4 3− reduced the Cr(VI) adsorption by competition with Cr(VI) for the active sites of PEI-Pal. The Cr(VI) saturated PEI-Pal can be regenerated in alkaline solution, and the adsorption capacity can still be maintained at 30.44 mg·g −1 after 4 cycles. The results demonstrate that PEI-Pal can be used as a potential adsorbent of Cr(VI) in aqueous solutions.
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APPLIED CLAY SCIENCE
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2013
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IF 2.342
Jixiang Xu,Wenbo Wang,Aiqin Wang
High-pressure homogenization process could well disaggregate the bundles of palygorskite (Pal) in water solution. In this paper, Pal was dispersed in dimethyl sulfoxide (DMSO) solvent via high-pressure homogenization process. The obtained Pal was characterized by infrared spectroscopy (IR), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The results showed DMSO-Pal interactions involving hydrogen bonding by zeolitic water and coordinated water. The obtained Pal aqueous dispersion displayed good colloidal stability. The reported method can potentially be used in the preparation of nanohybrid material.
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Journal of Environmental Sciences
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2015
·
IF 2.002
Guangyan Tian,Wenbo Wang,Yuru Kang,Aiqin Wang
Herein, palygorskite (PAL) was activated via a simple hydrothermal process in the presence of ammonium sulfide, and the effects of activation on the microstructure, physico-chemical feature and adsorption behaviors of PAL were intensively investigated. The hydrothermal process evidently improved the dispersion of PAL crystal bundles, increased surface negative charges and built more active –Si–O − groups served as the new “adsorption sites”. The adsorption property of the activated PAL for Methyl Violet (MV) was systematically investigated by optimizing the adsorption variables, including pH, ionic strength, contact time and initial MV concentration . The activated PAL exhibited a superior adsorption capability to the raw PAL for the removal of MV (from 156.05 to 218.11 mg/g). The kinetics for MV adsorption followed pseudo second-order kinetic models, while the isotherm and thermodynamics results showed that the adsorption pattern well followed the Langmuir model. The structure analysis of PAL before and after adsorption demonstrated that electrostatic interaction and chemical association of –X–O − are the prominent driving forces for the adsorption process.
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PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Wen Zhang,Meisheng Li,Jie Wang,Yijiang Zhao,Shouyong Zhou,Weihong Xing
New heterogeneous poly(ionic liquids) catalysts (PAL-PILs) were successfully prepared by grafting polymerization of acid ionic liquids (ILs) (1-butysulfonate-3-vinylimidazole hydrogen sulfate) onto nanofiber-like palygorskite (PAL) supports that had been, in advance, covalently modified by γ-methacryloxypropyl trimethoxy silane (OPAL). Using the ester yields and PILs grafting degrees as main indexes, the optimized immobilization conditions were that the mass ratio of OPAL to ILs monomer was 1:2, the immobilization temperature and time were 60 °C and 30 h, the initiator (2,2′-Azobis(2-methylpropionitrile) dosage was about 5 wt%, respectively. Then, the esterification between methanol and oleic acid was carried out to investigate the catalytic properties of PAL-PILs. For the homogeneous ILs catalyst, the yield of methyl oleate was about 85%. For the PAL-PILs, on which only about 41% of ILs used in homogeneous catalysis was immobilized, the yield could reach over 69% after reacting only 5 h at 75 °C at atmospheric pressure, when the molar ratio of methanol to oleic acid is adjusted to 12:1. More importantly, the yield of methyl oleate still maintained at about 22% after 6 recycling experiments. Moreover, the PAL-PILs catalysts exhibited efficient catalytic properties and could be recycled easily. These results offer great potential for the PAL-PILs in the biodiesel production for further research.
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Journal of Environmental Sciences
·
2025
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IF 6.3
Yuanyuan Wang,Shijun Jia,Shiqiang Ding,Wenyan Zhang,Rui Shu,Yingfei Hu
Using natural minerals to eliminate harmful Cr(VI) under sustainable sunshine has significant potential. Herein, Palygorskite nanorods were utilized as carriers for the in-situ synthesis of CaIn 2 S 4 photocatalysts through a simple one-pot thermal process, enabling the efficient reduction of Cr(VI). With a Palygorskite to CaIn 2 S 4 mass ratio of 5 %, the conversion rate of Cr(VI) reached 98 % after 60 minutes of visible-light exposure, with a remarkable reaction rate of 0.0633 min −1 . The effective integration of CaIn 2 S 4 with Palygorskite led to a more uniform dispersion of CaIn 2 S 4 , exposing more reactive sites. Moreover, the establishment of a heterojunction between CaIn 2 S 4 and Palygorskite facilitated the transport of photogenerated electrons from CaIn 2 S 4 , enhancing the efficiency of charge separation. These factors contribute to the improved photocatalytic performance. Additionally, the developed composite photocatalysts demonstrated excellent stability under light exposure and could be reused efficiently. Trapping tests on active substances revealed that e − played key roles in the Cr(VI) reduction. This research suggests the potential of using natural minerals to fabricate composite photocatalysts capable of effectively removing pollutants from the environment using solar energy.
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ELECTROCHIMICA ACTA
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2012
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IF 3.832
Keliang Wang,Hui Wang,Sivakumar Pasupathi,Vladimir Linkov,Shan Ji,Ronfang Wang
PtSn nanoparticles deposited on a stable electrocatalytic support containing conventional carbon and palygorskite are prepared using pre-treated palygorskite and are evaluated by ethanol oxidation. The electrocatalysts are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). TEM and XRD show that the pre-treatment has an effective impact on the morphology of palygorskite, but does not destroy its architecture. XPS results imply that introduction of palygorskite can facilitate the formation of Sn oxides on the surface of catalyst. Sn oxides increase the amount of surface oxygen-containing species and in turn facilitate to oxidize CO-like species adsorbed on Pt active sites, which has been proved by CO stripping voltammetry. Cyclic voltammetry (CV) measurements show that the addition of palygorskite into the carbon as support improves the electrocatalytic activity in ethanol oxidation. The developed new composite support is catalytically more active for ethanol electrooxidation than the conventional carbon support and shows good stability, offering great potential for widespread application of palygorskite as support for electrocatalysis.
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