APPLIED CLAY SCIENCE
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2020
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IF 4.605
Lei He,Yu Mao,Pengying Zhang,Tingting Xu,Jing Chen,Mengxin Song,Miao Pan,Lingli Ni
A novel palygorskite (Pal) based fluorescence sensor (Pal-PBS-C 12 ) was developed for the vapor probing of volatile organic compounds. Pal is a naturally occurred fibrous phyllosilicate mineral and it acts as a supporting substrate in the fluorescence sensory material. Perylene-3,4,9,10-tetracarboxylic dianhydride (PBS), playing the role of fluorescence probe, was grafted to Pal. With further introduction of the hydrophobic n-dodecylamine group, the organic affinity of the sensory material was dramatically improved. The PAL-PBS-C 12 material exhibited good sensitivity, photostability, and selectivity in solid-state fluorescence probing performance tests for organic vapors. Different from the traditional sensors, which show fluorescence diminishment upon contact with target molecules, the reported material exhibited fluorescence enhancement after contact with polar organic vapors. The mechanism of the fluorescence enhancement was proposed.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Wenbo Wang,Taotao Lu,Yulin Chen,Guangyan Tian,Virender K. Sharma,Yongfeng Zhu,Li Zong,Aiqin Wang
Palygorskite (Pal) is a natural abundant environment-friendly adsorbent that has shown high efficiency to decontaminate dye in water. However, the dye removal results in transformation of Pal to a very stable Maya Blue-like structure or waste Pal clay (WPal), which could not be easily regenerated by a commonly used desorption process. This paper presents a use of WPal as the precursor material to synthesize a highly-efficient mesoporous silicate/carbon composite adsorbent. The composite adsorbent has a large specific surface area (427.9 m 2 ·g −1 ), a high negative potential (−40.6 mV) and a mesoporous size (3.48 nm). This adsorbent shows almost complete removal of tetracycline (TC), crystal violet (CV) and methylene blue (MB) (initial concentration, 200 mg·L −1 ) with the optimal adsorption capacities of 319.8 mg·g −1 , 244.4 mg·g −1 and 281.7 mg·g −1 , respectively. The active -Si-O − adsorption sites produced by the breaking of inert Si-O-Si (or M) bonds and the electrostatic interactions of negatively charged adsorbents to adsorbates play a major role in the adsorption process. Adsorption capacities of the developed composite are significantly higher than that of Pal, WPal and hydrothermally treated WPal (HWPal). Results demonstrate that the composite adsorbents have high potential in decontamination of organics in water efficiently.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Jing Zhang,Ning Gao,Fulong Chen,Tao Zhang,Guilong Zhang,Dongfang Wang,Xingyong Xie,Dongqing Cai,Xijun Ma,Lifang Wu,Zhengyan Wu
In this paper, we firstly used the inorganic nano-network of palygorskite (IPAL) with multiporous structure fabricated from rigid nano-rods by ion beam bombardment to enhance the photoactivity of the graphitic carbon nitride (CN). Results of spectroscopy techniques show that the as-prepared sample (IPAL/CN) displays broader light absorption in the visible light region and low recombination of charge carriers. Photocatalytic illustrations of Cr (VI) (and methylene blue (MB)) in aqueous solution by IPAL/CN samples were investigated respectively. Results show that the IPAL/CN-1:6 composites exhibit a superior catalytic activity with 99.5% of Cr (VI) and 99.2% of MB removal efficiency in 100 min, which were almost 7.0 times and 9.5 times higher than that of pure CN, respectively. After four cycles, the IPAL/CN-1:6 exhibits great photoactivity. Moreover, the reaction can be conducted better under the low pH value of the solution, and the initial concentration can influence the reaction property. The theory of DLVO and zeta potential were used to analyze the dispersion effect on the samples. The higher photoactivity of the IPAL/CN samples could be attributed not only to the high adsorption capacity but also to the improved dispersion affected by the nano-network of IPAL. This study provides a new opportunity for the modification of photocatalyst by the inorganic nanomaterials formed easily by physical irradiation.
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高影响因子
CHEMOSPHERE
·
2019
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IF 5.108
Wenyi Wang,Yiming Li,Wenbo Wang,Baoyu Gao,Zhining Wang
Palygorskite (Pal) is a highly hydrophilic clay mineral with tubular structure and high aspect ratio , which facilitates the attachment of nanoparticles to their surface. It has become a promising new membrane preparation additive due to its lotus root like tubular structure, low price and environmental friendliness. Silver nanoparticles (AgNPs) have excellent antibacterial ability, and their incorporation into the membrane can significantly improve the bacteriostasis of the membrane. Herein, Pal was coated by polydopamine (PDA), which acted as both the adhesive and reducing agent for AgNPs. The incorporation of the Pal/Ag nanocomposite resulted in a thin polyamide (PA) layer with rough surface morphology, which facilitated the improvement of membrane permeability. Furthermore, the Pal's parallel tubes with a 0.37 × 0.63 nm 2 cross-sectional area provided nanochannels allowing fast pass through of water molecules. The as-prepared TFN-7.5Pal/Ag membrane exhibited a permeate flux of 39.9 LMH at 16 bar, which was 1.6 times as high as that of the TFC membrane, accompanied with an acceptable NaCl rejection of 98.3%. Besides, antibacterial tests demonstrated that the TFN membrane presented excellent antibacterial performance against Escherichia coli (98.0%).
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PubMed
高影响因子
Materials Today Communications
·
2024
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IF 3.7
Jinyuan Zhao,Hongwang Yang,Zhanxin Jiang,Jingquan Wang,Chuncai Kong,Zhimao Yang,Tong Wang,Hao Zhu
The acid-activated dispersive palygorskite nanorods supported copper manganese composite oxide (CuMn/PG) was synthesized for catalytic oxidation of toluene. The palygorskite nanorods with higher purity were purified, separated and acid-activated by natural palygorskite. The pretreated palygorskite was used as the support to prepare CuMn/PG with large specific surface area, controllable morphology, adjustable size, and excellent catalytic activity through the regulation of a variety of surfactants in the process of co-precipitation. When non-ionic polyethylene glycol (PEG) was used as the surfactant, the copper-manganese oxide exhibited good dispersibility on the palygorskite nanorods. The CuMn/PG catalysts with different ratios prepared presented larger specific surface areas, which effectively solved the problem of small specific surface area of copper manganese oxide catalyst. Among them, the CuMn/PG catalyst with a copper-manganese molar ratio of 1:1 formed CuMn 2 O 4 spinel structure phase to enhance the catalysis of toluene with low temperatures of T 50 (195 °C) and T 90 (210 °C). At the same time, the CuMn/PG exhibited good stability. the removal rate of toluene still reached 98.5% after continuous operation for 60 h.
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高影响因子
APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Rongpeng Yu,Qinya Huang,Zhiwei Ding,Yiran Li,Chaoyang Li,Zhanchao Liu,Yan Liu
Considering the effect of secondary metabolites on quercetin (QC) separation and purification in plants, herein, four types of hydrophilic deep eutectic solvents (DESs) composed by organic acids and glycosyl-, quaternary ammonium- or alcohol-based hydrogen bond acceptors were designed and modified on the palygoskite (Pal) surface to improve the selectivity of QC via dispersive solid-phase extraction (D-SPE). The selectivity study followed the following order: Pal- [Choline chloride (ChCl)] [Levulinic acid (Lev)] > Pal- [Glycerol (Gly)] [L-Proline (Pro)] > Pal- [Glucose (Glu)] [D-lactic acid (Lac)] > Pal- [Benzyl triethyl ammonium chloride (BTBAC)] [D-lactic acid (Lac)]. Based on the single-factor method, Response surface methodology (RSM) by using a Box-Behnken design (BBD) was applied to assess the mutual interactions and effects between the three factors and the optimized preparation conditions. The optimal nanoparticles (Pal- [ChCl] [Lev]) showed the best adsorption capacity for QC (29.81 mg/g) in the mixture of methanol and phosphate buffered solution (PBS) and high selectivity which was 1.95 times and 2.12 times that of luteolin and rutin hydrate, respectively. Mechanism exploration indicated that Pal-DESs selectively adsorbed QC via electrostatic interaction, π-π stacking and hydrogen bonds. Furthermore, the screened DES of ([ChCl] [Lev]) could act on QC aqueous solution to improve its solubility and stability during preservation. The proposed QC separation strategy centered on the guiding role of DESs in selective adsorption. Additional alternatives for the synthesis of high-efficiency and hydrophilic functional adsorbents for flavonoids were made available by this green DESs regulation concept.
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高影响因子
APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Ping Chen,Hui Zhong,Xiao-rong Li,Tingting Zhang,Xiang Wang,Fang Hu,Yubo Yan,Jiaxing Xu,Meisheng Li
A novel nanozyme, based on copper-ion-complexed palygorskite (Pal Cu 2+ ), was synthesized using a facile method. The introduction of Cu 2+ demonstrates a synergistic effect with Pal, enhancing the peroxidase-like activity for the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . Steady-state kinetic analysis revealed that Pal Cu 2+ exhibits a higher affinity for substrates compared to native horseradish peroxidase, presenting a practical alternative to natural peroxidase. The efficacy of Pal Cu 2+ as a peroxidase mimic for H 2 O 2 sensing was investigated through colorimetric methods. Additionally, when combined with enzymatic glucose oxidation, a sensitive and selective colorimetric strategy for glucose detection was established. The developed method was effectively applied to detect H 2 O 2 and glucose in real samples. The proposed strategy offers an approach for the rational design and development of metal ion composites, opening new way for future applications of Pal-based materials.
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高影响因子
APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Jixing Fan,Qian Liu,Li,Li,Guanzheng Zhuang,Peng Yuan
Maya Blue, a hybrid pigment that can be synthesized by heating a mixture of palygorskite (or sepiolite) and indigo, has unclear relationships between the structural features of clay substrates, heating atmosphere, colors, and stability. This study investigates the color properties, stability, and clay-dye interactions of Maya Blue pigments based on palygorskite and sepiolite, heated under air and vacuum conditions (180 °C for 8 h). Reflectance spectra, CIE color parameters, surface properties, and Fourier-transform infrared spectroscopy were employed to evaluate these pigments. Results indicate that indigo monomers can penetrate the channels of both palygorskite and sepiolite, conferring a greenish-blue hue and high stability. However, the diffusion of indigo is determined by the size match between the channel and indigo monomers. In palygorskite, indigo monomers can diffuse only upon heating because the channel size is only a little bit larger than the indigo molecule, while in sepiolite, lager channels allow easy diffusion, even without heating. However, sepiolite's larger channels make indigo molecules more prone to chemical degradation or migration. Under vacuum conditions, indigo molecules more easily diffuse into the channels of both clay minerals, yielding pigments with higher saturation and enhanced stability. These findings highlight the size-matching between clay minerals' micropores and organic molecules and offer valuable guidance for optimizing the preparation process of clay-dye hybrid pigments.
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高影响因子
APPLIED CLAY SCIENCE
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2024
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IF 5.3
Dan Wang,Yan Wang,Changjiang Li,Junmin Ji
In this work, using various Span series surfactant (Span 40, Span 60, and Span 80) liquor, three types of newly functional palygorskite adsorbents were developed for removing multiple aflatoxins from peanut oil. The palygorskite infiltrated with Span surfactants all showed excellent detoxification ability in the adsorption of aflatoxins. The removal of AFB 1 by palygorskite infiltrated with Span 40, Span 60, and Span 80 was 94.75 %, 93.85 %, and 91.99 %, respectively. Compared with unmodified palygorskite, the removal of aflatoxins by the three adsorbents was increased by 10.05 %, 9.58 %, and 8.40 %, respectively. What's more, the retention of nutrients in peanut oil was enhanced after treatment with modified adsorbents. Among them, the retention rate of sterols in the oil after Span 40-palygorskite detoxification was increased by 18.71 %, and the tocopherol was increased by 11.20 %. Lastly, the adsorption mechanism was further discussed using kinetic, isothermal, and thermodynamic models. The Freundlich isothermal, Dubinin-Radushkevich model, and the pseudo-second-order rate expression all exhibited a strong association with the test results. The adsorption process mainly involved ion exchange, hydrophobic interactions, and pore-filling effects. Thermodynamic analysis ( ΔG 0 < 0, ΔH 0 > 0, ΔS 0 > 0) denoted that the adsorption effect was spontaneous and endothermic. The composite adsorbents could be a suitable candidate for the elimination of multiple aflatoxins with the merits of high detoxification efficiency, low preparation cost, green, and safety, which may open up new ideas for the creation of novel adsorbents in the fats and oils industry.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
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IF 3.89
Dajian Huang,Yuting Zheng,Qiling Quan
Palygorskite , a natural 1D nanofibre, has been employed as an effective reinforce filler of natural hydrophilic polymer-based nanocomposites because of its high mechanical strength, large specific surface area and high aspect ratio . However, the hydrophilic hydroxyl groups only exist at the edge of the silicate layer of palygorskite nanofibres and in small amounts. Therefore, the reinforcement efficiency for the hydrophilic polymer of palygorskite is limited. To overcome this shortcoming, we constructed a highly hydrophilic polydopamine with catechol groups on the palygorskite nanofibre surface by a facile biomimetic method. Hydrophilic polymer carboxymethyl cellulose nanocomposites incorporated with polydopamine-coated palygorskite were fabricated by solution casting . Results show that the interfacial polydopamine layers not only facilitate the dispersion of palygorskite nanofibres in the carboxymethyl cellulose matrix but also enhance the stress transfer from the carboxymethyl cellulose matrix to the filler, improving the tensile strength and water resistance of the nanocomposites. However, several palygorskite crystals aggregate to form small bundles for the palygorskite with a high mass ratio of dopamine/palygorskite during the modification process. This phenomenon decreases the contact areas between the filler and the carboxymethyl cellulose matrix, thereby decreasing the properties of the nanocomposites. In addition, UV–vis transmittance spectra show that the nanocomposite films reinforced with polydopamine-modified palygorskite can block ultraviolet light below 300 nm, thereby retaining its relatively high transparency in the visible spectrum.
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高影响因子
APPLIED CLAY SCIENCE
·
2022
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IF 5.907
Changou Pan,Peng Liu
Clays have been widely used for various fields after surface modification. In our previous work, nitrile butadiene rubber (NBR) had been successfully grafted onto palygorskite nanorods (Pal NRs) via the surface olefin cross-metathesis (OCM) reaction and their potential applications were preliminarily explored as nano-reinforcing agent, self-separable adsorbent, or Pickering surfactant. Aimed on a precise manipulation of the products for better performance in such specific applications, the modification of Pal NRs with NBR via OCM was optimized, including different vinyl groups modified on Pal NRs, feeding ratios, solid contents, solvents and reaction times. The reaction time was found as a critical factor for the manufacturing of nitrile butadiene rubber modified palygorskite nanorods (NBR-Pal NRs) as potential nano-reinforcing agent and Pickering surfactant. Overreaction with prolonged reaction time would produce the crosslinked nitrile butadiene rubber-palygorskite nanorods microgels (NBR-Pal MGs) as self-separable adsorbent. Furthermore, the better dispersibility of the Pal NRs and the better dissolubility of NBR could be achieved with the polar solvent , favoring the OCM reaction between the V-Pal NRs and accelerating the formation of the NBR-Pal MGs.
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高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Xuemin Zhong,Yanfu Wei,Samahe Sadjadi,Dong Liu,Mengyuan Li,Ting Yu,Guanzheng Zhuang,Peng Yuan
Aerobic oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) to 2, 5-furandicarboxylic acid (FDCA) is an important reaction for producing green and sustainable chemicals. Herein, natural clay mineral palygorskite (Pal)-supported bimetallic Pt–Pd catalyst for the oxidation of HMF to FDCA in water without the addition of any bases was developed. The 1Pt 9 Pd 1 /Pal catalyst with Pt/Pd molar ratio of 9/1 exhibited excellent catalytic performance, and 100% HMF conversion and 99% FDCA yield were obtained under optimum reaction conditions after 12 h, which was mainly attributed to the synergy between palygorskite and bimetallic Pt–Pd nanoparticles . Palygorskite used as support realized the immobilization and dispersion of bimetallic nanoparticles, increasing the catalytic activity . The basicity of palygorskite and alloying effects between Pt and Pd facilitated the formation of FDCA by synergistically catalyzing the oxidation of alcohol and aldehyde groups in the reactants and intermediates. Furthermore, this catalyst showed good stability and reusability . The present work provides a highly efficient, cost-effective, and environmentally benign catalyst for the base-free oxidation of HMF to FDCA in practical industrial applications.
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高影响因子
危险品化学品经营许可证（带存储）