RSC Advances
·
2016
·Vol. 6
·期 48
·41696-41706
·
IF 3.289
Guangyan Tian,Wenbo Wang,Li Zong,Yuru Kang,Aiqin Wang
Palygorskite (PAL) has been widely used for adsorption removal of dyes from wastewater, but the dye-loaded PAL is usually discharged as solid waste because it is hardly regeneratable by conventional elution processes. As the aim was to efficiently utilize the dye-loaded PAL waste, we employed a facile one-pot hydrothermal process to transform the spent methyl violet (MV)-loaded PAL into multifunctional ternary palygorskite/carbon/Ag nanoparticles (PAL/C/AgNPs) nanocomposites in the assistance of AgNO3. The MV-loaded PAL serves as a carbon precursor, reducer of Ag(I) and supporter of the in situ formed AgNPs. Structure characterizations confirmed that the MV dye was transformed into carbon species, and AgNPs were formed on the PAL with good dispersion, and the addition of Ag(I) ions promoted carbonization of the MV molecules. The as-prepared nanocomposites exhibited excellent adsorption and catalytic performance. Adsorption evaluation showed that the nanocomposite prepared at 5 mass% of AgNO3 dosage gives the best adsorption properties, and 99.2% of methylene blue (MB), 86.9% of MV, 68.7% of chlortetracycline hydrochloride (CTC) and 46.2% of tetracyclines (TC) were rapidly removed from 100 mg L−1 of the aqueous solution using 0.5 g L−1 of the adsorbent. The removal ratio increased with increasing dosage of adsorbent, and the minimum usage amounts of adsorbent for the thorough removal of MB, MV, CTC and TC molecules were 1.0 g L−1, 1.2 g L−1, 3.5 g L−1 and 4.5 g L−1, respectively. Moreover, the nanocomposites could rapidly catalyze the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 6.5 min with a catalytic rate constant of 0.0120 s−1, and the catalytic activity is still retained after 8 cycles of reuse. In addition, the nanocomposite can be re-generated into new adsorbents by the same hydrothermal process after adsorption of organic matters, which open a new sustainable avenue to efficiently utilize waste dye-loaded PAL and develop new adsorption and catalysis materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Junjie Ding,Dajian Huang,Wenbo Wang,Qin Wang,Aiqin Wang
Natural palygorskite (Pal) nanorods have huge application prospect as a reinforcing filler of polymer material, but the presence of variable coloring metal ions (i.e., Fe(III)) in natural Pal may affect the comprehensive properties of polymer materials. In order to reveal the effects of removing coloring metal ions on the structure and mechanical, transparency and anti-aging performance of the polymer, a series of sodium alginate/Pal (SA/Pal) nanocomposite films were prepared using natural brick-red Pal (RPal) and white acid-leached Pal (HPal) as fillers, and their properties were investigated comparatively. Results indicate removal of partial metal ions in Pal greatly improved the mechanical, transmittance, water-resistance and anti-aging properties of SA/HPal film in contrast to the SA/RPal film, due to the intensified interaction between HPal and SA. After exposure in UV condition for 72 h, the SA/RPal film becomes brittle with a great decrease of tensile strength from 11.05 to 6.71 MPa; but the SA/HPal film still keeps good flexibility with only a slight decrease of tensile strength from 14.66 to 12.09 MPa, indicating a passive effect of removing Fe(III) on improving anti-aging performance of SA/Pal film. This research paves a theoretical foundation to extend the application of naturally abundant Pal in polymer materials.
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PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yan Zhao,Xiaoyu Han,Na Zhang,Junping Meng,Hong Zhang,Jinsheng Liang
In view of the animal feeds inevitably contaminated by multiple mycotoxins, eco-friendly and efficient palygorskite-montmorillonite (Pal-Mt) materials were prepared to remove polar aflatoxin B1 (AFB1) and weak polar zearalenone (ZEN) from mixed mycotoxins aqueous solution. The adsorption properties and bonding mechanisms between Pal-Mt materials and mycotoxins (AFB1 and ZEN) were investigated systematically. The as-prepared Pal-Mt showed excellent adsorption capacity for AFB1 and ZEN in single- and binary-mycotoxin systems, indicating the effectiveness of Pal-Mt acting as multiple mycotoxin adsorbents. The kinetics of adsorption for ZEN was fast due to the adsorption on the external surface (film and intraparticle diffusion), while AFB1 molecules permeated into mesopores after the external adsorption for the more planar structure. Adsorption isotherms demonstrated that heterogeneous surface adsorption appeared between Pal-Mt and AFB1, and monolayer adsorption occurred on Pal-Mt and ZEN for different polarities of mycotoxins. Thermodynamic parameters illustrated that the adsorption process of both AFB1 and ZEN onto Pal-Mt was spontaneous and endothermic. The adsorption mechanism studies suggested that hydrogen bonding, electrostatic attraction, calcium bridging linkage, and ion-dipole played fundamental roles in the interaction between Pal-Mt and these two mycotoxins.
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APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Yingying Shi,Youdong Hu,Lei Zhang,Zewei Yang,Qianghua Zhang,Hao Cui,Xiufang Zhu,Jizhong Wang,Jing Chen,Kanglin Wang
A novel bismuth vanadate-palygorskite (BiVO 4 -Pal) photocatalyst was successfully prepared by a hydrothermal method . The morphology, structure and chemical composition of the composite was characterized. The adsorption capacity and photocatalytic activity under visible light of this composite to tetracycline hydrochloride were also investigated. The results indicated that BiVO 4 was successfully loaded on the Pal. Pal, as a low cost support, improved the adsorption capacity of the photocatalyst, thus increased the contact possibility with the active radicals, hence, the degradation activity of BiVO 4 was improved. The maximum adsorption capacity of BiVO 4 -Pal for tetracycline (TC), calculated by the Langmuir model at 20 °C, was 33.11 mg·g − 1 . The pseudo-first-order degradation rate constant for BiVO 4 -Pal composites was approximately 2.1 times higher than that of pure BiVO 4 , and the photodegradation ratio on the BiVO 4 -Pal composite was 1.4 times greater than that of pure BiVO 4 . In addition, the recovery of the BiVO 4 -Pal composite was carried out after the reaction by calcination at 400 °C for 4 h. The test showed that the prepared BiVO 4 -Pal catalyst was stable during the photodegradation of TC. There was no obvious reduction in the degradation rate of TC over the four successive runs and might be useful for practical applications.
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APPLIED CLAY SCIENCE
·
2014
·
IF 2.703
Shuai Han,Feng Liu,Jiang Wu,Yu Zhang,Yujie Xie,Wenyu Wu,Weisheng Liu,Qin Wang,Yu Tang
Palygorskite (Pal), a natural clay mineral, grafted by functional macromolecule polyethyleneimine (PEI) via the coupling grafting method, has further been modified by introducing both fluorescein isothiocyanate (FI) and folic acid (FA), with the aim of specifically targeting and detecting cancer cells. The formed Pal-PEI–FI–FA nanocomposite was nontoxic up to a concentration of 300 μg·mL − 1 , and further could be specially taken up by HeLa cells via FA receptor-mediated endocytosis as shown by confocal microscopy and inductively coupled plasma optical emission spectroscopy (ICP-OES) data. Therefore, it is concluded that the novel Pal-based nanocomposite has great potential for biomedical sensing, diagnosis, and therapeutics.
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APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Changou Pan,Peng Liu
Palygorskite (Pal) had been widely investigated as adsorbent, owing to its plentiful tunnels in crystals and channels on surface. But the two main challenges restricted its practical application: inconvenient separation and reuse. Here, Pal-based self-separable nano-adsorbent was developed via the surface olefin cross-metathesis (OCM) of nitrile butadiene rubber (NBR) from the methacryloxypropyl-modified Pal nanorods (M-Pal). The P-Pal microgels as small covalent aggregates with higher Pal content, could be easily dispersed into water, and interestingly, settled down completely within 6 min after adsorption of methylene blue (MB) with capacity of 33.0 mg g −1 , slightly higher than the pristine Pal nanorods . The adsorbed MB could be completely desorbed by twenty times of desorption with 1.0 M HCl/ethanol. However, the desorption in repeated use was controlled by the adsorption/desorption equilibrium of MB in the tunnels of Pal nanorods , maintaining adsorption capacity of about 3.0 mg g −1 and 4.6 mg g −1 for reuse with ethanol or 1.0 M HCl/ethanol as eluent.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Hong Zhang,Ling Chu,Jiuling Wang,Qilong Guo,Wenbo Zhang
Sodium alginate composite beads were synthesized using iron/nickel decorated palygorskite as filler by calcium chloride crosslink and applied to remove tetracycline (TC) from water efficiently. The beads were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results suggested that the synergistic effect of nano iron/nickel and palygorskite could improve the adsorption performance of the beads for TC greatly. Batch adsorption experiments showed that the adsorption process fitted the Sips model and the maximum adsorption capacity of TC could reach 189.86 mg/g at 298 K, which was 31.6 times than that of pure sodium alginate and 4 times than that of palygorskite. The beads could be easily separated from water after adsorption using a mesh sieve. The adsorption mechanisms were mainly contributed to electrostatic attraction , π-π accumulation, hydrogen bond, silicate bond, chelation and ion exchange. In addition, the site energy distribution found that the surface of the adsorbents showed more heterogeneity at higher temperatures. The prepared beads could thus be used as a promising adsorbent for TC from water.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yaqun Yu,Yuefei Ji,Junhe Lu,Xiaoming Yin,Quansuo Zhou
In this study, a simple hydrothermal method was used to synthesize Co 3 O 4 -palygorskite composites. Transmission electron microscopy, X-ray spectroscopy and X-ray diffraction analysis showed that Co 3 O 4 nanoparticles with diameters of approximately 3–5 nm were uniformly distributed on the surface of palygorskite fibers. Co 3 O 4 -palygorskite composites were outstanding catalyst for activating peroxymonosulfate (PMS) to degrade the antibiotic sulfamethoxazole (SMX). Complete removal of 30 μM SMX at pH 3–5 was achieved with doses of 0.3 mM PMS and 125 mg/L Co 3 O 4 -palygorskite composites. The composites exhibited higher catalytical activity than unsupported Co 3 O 4 . The removal rate of SMX was accelerated under acidic conditions (pH 3–5), while was significantly inhibited under basic conditions (pH 11–12). Radical quenching tests revealed that SO 4 − and OH were responsible for the degradation. The oxidative degradation was initiated at either isoxazole or aniline moiety of the SMX molecule. Using solid phase extraction-liquid chromatography-time-of-flight-tandem mass spectrometry, a total of six transformation products formed from benzene ring hydroxylation, S-N bond cleavage, aniline moiety oxidation and coupling reactions were identified. Based on the products, three transformation pathways are proposed for the catalytic degradation of SMX in the Co 3 O 4 -palygorskite/PMS system.
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JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 2
·1-11
·
IF 2.8
Li Jin,Wang Xinyang,Zhang Pengying,Chen Quan,Min Dandan,Jiang Xiaowu,Gao Xiaoyan,Ni Lingli
A facile continuous flow Pickering emulsion photopolymerization process was developed to fabricate polymer/clay composite microcapsules. Photolatent Pickering emulsions of oil (monomer, crosslinker, Irgacure 819 and octane) in water were prepared using palygorskite fibers (PAL) as particulate emulsifier. Serials of factors on the formation of microcapsules have been investigated, such as PAL concentration, photoinitiator percentage, light intensity, crosslinker/monomer ratio and monomer type. Although the presence of higher PAL concentration provides the more stabile emulsion, 3 wt% of PAL offered the best condition to achieve polymer/PAL microcapsules by SEM observation. Further, it was found that 6 wt% of photoinitiator with 2 mW/cm 2 irradiation intensity provided the most suitable photopolymerization conditions for the formation of polymer/PAL microcapsules. Among different monomers, the one that formed polymer with suitable flexibility offered better formation of polymer/PAL spherical microcapsules. Additionally, the formation mechanism of the polymer/PAL microcapsules has been proposed.
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APPLIED CLAY SCIENCE
·
2014
·
IF 2.703
Yong Kong,Hanli Ge,Jianxin Xiong,Shixiang Zuo,Yong Wei,Chao Yao,Linhong Deng
A clay polymer nanocomposite (CPN) based on aspirin-loaded palygorskite (Pal) modified polypyrrole (PPy) was prepared by in situ electropolymerization of pyrrole monomer in the presence of Pal as the modifier and aspirin as the drug source. This drug-loading approach was simple and convenient, since colloid templates such as polystyrene microspheres used in conventional drug-loading system were not needed. The resulting CPN was characterized by TEM , XRD , cyclic voltammetry (CV), chronocoulometry , electrochemical impedance spectroscopy (EIS) and FTIR. The CPN was used as a new platform for aspirin delivery, which could significantly enhance aspirin loading capacity of the system and control aspirin release by external electrical stimulus. The results indicated that the proposed novel drug-delivery system might be promising as an implantable device where drug release could be electrically tuned according to the patient's requirement.
研究领域:
生物材料学
·
药物递送
·
纳米医学
·
电化学药理学
·
再生医学
·
植入式医疗器械
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·247
·
IF 5.3
Xu-rui Wang,Zhe-yi Meng,Xue-fen Wang,Wei-long Cai,Ke Liu,Dong Wang
To develop membrane materials with good performance for water purification that are green and low cost, this work reports an organic–inorganic composite membrane composed of silk nanofibrils (SNFs) and palygorskite (PGS). To improve the stability of the the composite membrane, genipin was used as a crosslinking agent to induce the conformational transition of SNF chains from random coils to β-sheets, reducing the swelling and hydrolysis of the membrane. The separation performance can be adjusted by tailoring the component ratio of the nanomaterial. The results showed that these membranes can effectively remove anionic dyes from water, and they exhibit excellent water permeability. The SNF-based membrane had strong mechanical and separation properties, and the PGS could tune the structure of composite membranes to enhance their permeability, so this green composite membrane has good prospects in water treatment and purification applications.Keywords:silk nanofibrils;palygorskite;genipin;water purification;anionic dyes
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 23
·4229-4236
·
IF 3.545
Sheng Wang,Yan Wang,Yu Zhuang,Wei Lian,Hengdong Ren,Yin Liu,Tianshu Zhang,Ling Bing Kong
In this paper, palygorskite (Pal) and spherical zinc sulfide (ZnS) nanopowders were successfully synthesized by using a simple hydrothermal method. The ZnS nanoparticles were supported on the framework of Pal without agglomeration, thereby increasing the specific surface area of Pal/ZnS nanocomposites (from 36.33 m2 g−1 to 83.85 m2 g−1). The acquired nanocomposites exhibited a significant enhancement in photoactivity for the degradation of rhodamine B under simulated sunlight irradiation. Specifically, when the content of Pal was 40%, the nanocomposite showed optimal photocatalytic activity, with a degradation rate of rhodamine B of 100% in 150 min. The improved photocatalytic performance of the nanocomposites may be attributed to the fact that the incorporation of Pal not only strengthened the adsorption of rhodamine B, but also reduced the band gap energy of the nanocomposites and the recombination rate of electrons and holes. Such inexpensive high-performance Pal/ZnS nanocomposites could find potential applications for the degradation of organic dyes.
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