JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Ruya Wang,Pu Wu,Yanru Cui,Meriem Fizir,Jianrong Shi,Hua He
Two thermo-responsive molecularly imprinted polymers (MHNTs@MIP and MCNTs@MIP) for the selective extraction of sterigmatocystin have been prepared on the surface of the magnetic halloysite nanotubes (MHNTs) and magnetic carbon nanotubes (MCNTs), respectively. 1, 8-dihydroxyanthraquinone, n-isopropyl acrylamide, methacrylic acid, ethylene dimethacrylate and dimethyl sulfoxide were used as the dummy template, thermo-sensitive functional monomer, co-monomer, cross-linker and porogen, respectively. The magnetic properties, adsorption properties as well as the temperature responsive behaviors of MHNTs@MIP and MCNTs@MIP were systematically studied and compared for the first time. Enough saturation magnetizations of MHNTs@MIP (9.42 emu/g) and MCNTs@MIP (10.54 emu/g) were obtained. MHNTs@MIP and MCNTs@MIP also showed controllable adsorption and release behaviors to sterigmatocystin in response to the temperature change (35 °C and 20 °C). Compared with MCNTs@MIP, MHNTs@MIP had higher adsorption affinity (K L = 0.120 L/mg), higher adsorption kinetic (K 2 = 0.0100 g/(mg•min)) and higher imprinting factor (5.22) to sterigmatocystin. These results indicated that MHNTs@MIP was favorable adsorbent for the selective separation of sterigmatocystin. Furthermore, the elution conditions of MHNTs@MIP were optimized by response surface methodology. Under the optimal conditions, MHNTs@MIP coupled with high performance liquid chromatography were successfully applied to the selective recognition, purification, enrichment and detection of sterigmatocystin in wheat samples. The recoveries were calculated from 88.62% to 102.9% with RSDs less than 3.5 % and limit of detection of 1.1 μg/kg. This work provided a suitable carrier for the preparation of imprinted polymers and a practical approach for highly selective recognition and determination of analytes in real samples.
研究领域:
食品科学
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分析化学
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DOI
高影响因子
APPLIED ENERGY
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2023
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IF 11.2
Xuke Ma,Chunyan Yang,Xuejiao Feng,Huishan Shang,Yafei Zhao,Bing Zhang
Developing low-cost composite phase change materials with good shape stability, excellent mechanical strength, high thermal conductivity, large encapsulation ratio, strong light absorption and eminent solar-to-thermal conversion capacity is of great challenge to solve the scaling-up related issues of organic solid–liquid phase change materials during the utilization of solar energy. In this work, halloysite/poly(vinyl alcohol) and halloysite/poly(vinyl alcohol)/reduced graphene oxide aerogels with rich three-dimensional honeycomb structure were prepared by a freezing and freeze-drying method, which can significantly promote the encapsulation ratio of lauric acid in the pores of both aerogels and halloysite nanotube. Halloysite nanotube with high aspect ratio can improve the compressive strength of the aerogels and shape stability of the composite phase change materials, while reduced graphene oxide can reinforce the thermal conductivity and light absorption ability. After encapsulation of lauric acid, the halloysite/poly(vinyl alcohol) 9:1 and halloysite/poly(vinyl alcohol)/reduced graphene oxide 9:1 phase change composites demonstrate extraordinarily high latent heat of 195.4 J/g and 197.0 J/g, respectively, leading to high encapsulation ratios of 97.2 % and 98.1 % respectively, accompanied by good chemical and thermal stability over 300 thermal cycles. The thermal conductivity of lauric acid@halloysite/poly(vinyl alcohol)/reduced graphene oxide is remarkably elevated to 0.343 W/m∙K, exceeding 39.4 % that of pure lauric acid (0.246 W/m∙K). Besides, the lauric acid@halloysite/poly(vinyl alcohol)/reduced graphene oxide realizes a conspicuous solar-to-thermal conversion with solar absorption capacity of 95 % throughout the full spectrum of solar light. The marvelous improvement in the solar-to-thermal conversion efficiency can be attributed to thermally conductive interconnected network of halloysite nanotube and reduced graphene oxide. Thus, lauric acid@halloysite/poly(vinyl alcohol)/reduced graphene oxide and lauric acid@halloysite/poly(vinyl alcohol) are tentatively used in the catalytic hydrolysis of ammonia borane, and they can efficiently harvest, convert and store solar energy in the form of thermal energy and release it for the reaction, which obviously accelerates the extent of reaction with turnover frequency increasing from 29.50 ( m o l H 2 / m o l c a t a l y s t · m i n ) at 25 °C to 59.18 and 41.74 ( m o l H 2 / m o l c a t a l y s t · m i n ) under the heating of solar energy stored lauric acid@halloysite/poly(vinyl alcohol)/reduced graphene oxide and lauric acid@halloysite/poly(vinyl alcohol), respectively. This work paves a way for fabricating halloysite-based aerogel and composite phase change materials for thermal/solar energy saving application.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
·
IF 3.898
Yafei Su,Xuke Zhang,Hui Li,Donglai Peng,Yatao Zhang
Layered assembled membranes of 2D leaf-like zeolitic imidazolate frameworks (ZIF-L) nanosheets have received great attention in the field of water treatment due to the porous structure and excellent antibacterial ability, but the dense accumulation on the membrane surface and the low permeate flux greatly hinder their application. Herein, we synthesized mHNTs (modified halloysite nanotubes)/ZIF-L nanocomposites on modified mHNTs by in situ growth method. Interestingly, due to the different size of mHNTs and ZIF-L, mHNTs were packed in ZIF-L nanosheets. The hollow mHNTs provided additional transport channels for water molecules, and the accumulation of the ZIF-L nanosheets was decreased after assembling mHNTs/ZIF-L nanocomposites into membrane by filtration. The prepared mHNTs/ZIF-L membrane presented high permeate flux (59.6 L·m −2 ·h −1 ), which is 2–4 times of the ZIF-L membranes (14.8 L·m −2 ·h −1 ). Moreover, mHNTs/ZIF-L membranes are intrinsically antimicrobial, which exhibit extremely high bacterial resistance. We provide a controllable strategy to improve 2D ZIF-L assembles, and develops novel membranes using 2D package structure as building units.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Ying Li,Xingzhong Yuan,Xian Guan,Jing Bai,Hou Wang
The application of amorphous ferrihydrite (Fh) for Cd(II) removal is restricted by its unstable and easily transformable nature. Although doping with silicates stabilized ferrihydrite, its product siliceous ferrihydrite (SiFh) again suffered from the disadvantage of spontaneous agglomeration. Herein, ferrihydrite was hybridized with halloysite nanotubes (HNTs) to prepare a novel siliceous ferrihydrite − coated halloysite nanorods (SiFh@HNTs) in alkaline medium, to break through the current barriers. The characterization results showed that SiFh@HNTs could simultaneously overcome the defects of easy phase transformation of ferrihydrite and easy aggregation of SiFh nanoparticles (NPs). Meanwhile, the optimal SiFh@HNT 40 with halloysite content of 40 % formed a well-developed mesoporous structure and exhibited the desired surface properties: a high specific surface area of 303.4 m 2 /g, an isoelectric point as low as pH iep = 4.5, and rich functional Fe − OH groups. The formation mechanism of such excellent sturcture–properties of SiFh@HNT 40 were mainly attributed to two factors: the generation of smaller (∼5 nm) SiFh NPs induced by the integration of halloysite-derived SiO 4 4- into ferrihydrite, and the dispersion of SiFh NPs on clay nanotubes. Furthermore, the adsorption capacity of SiFh@HNT 40 for Cd(II) was up to 137.8 mg/g at 30 °C and pH 6, which was much higher than that of aggregated ferrihydrite (11.2 mg/g), halloysite (18.8 mg/g) and goethite (49.4 mg/g). The adsorption thermodynamics study revealed the adsorption of Cd(II) on SiFh@HNT 40 was clearly chemisorption with a (ΔH ads ) q of 43.3 kJ/mol. Characterization results of XPS and FTIR confirmed that the rich Fe − OH groups on SiFh@HNT 40 was the main adsorption sites, and Cd(II) was specifically adsorbed by inner-sphere surface complexation. In addition, SiFh@HNT 40 had application potential in the mixed-metal wastewaters treatment. Cyclic regeneration experiments showed that SiFh@HNT 40 had good regeneration performance and could be reused many times.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Gongwen Tang,Chong Chen,Dongxia Wu,Zhishan Yan,Tingting Ren,Xiangyu Hou,Man Zhao,Shancan Fu,Lihua Fan
The corrosion resistance of the waterborne epoxy coating is poor during long-term service, which greatly limits its widespread application. In this paper, the halloysite nanotubes (HNTs) were modified by polyaniline (PANI) and then used as nanocontainers to encapsulate the green corrosion inhibitor praseodymium (III) cations (Pr3+), obtaining HNTs@PANI@Pr3+ nanoparticles. A scanning electron microscope, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis were applied to characterize the formation of PANI and the absorption of Pr3+ cations. The corrosion-inhibiting ability of the HNTs@PANI@Pr3+ nanoparticles for iron sheets and the anticorrosion properties of the nanocomposite coatings were evaluated by the electrochemical impedance spectroscopy technique. The results indicated that the coating containing HNTs@PANI@Pr3+ nanoparticles exhibited excellent anticorrosion performance. After immersion in 3.5 wt % NaCl solution for 50 days, its Zf=0.01 Hz value was still as high as 9.4 × 108 Ω cm2. The icorr value was 3 orders of magnitude lower than that of the pure WEP coating. The excellent anticorrosion property of the HNTs@PANI@Pr3+ coating could be attributed to the synergy of three beneficial factors, including evenly distributed nanoparticles, PANI, and Pr3+ cations. This research will provide theoretical and technical support for the development of waterborne coatings with high corrosion resistance.
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PubMed
高影响因子
Biosensors-Basel
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2022
·Vol. 12
·期 6
·387
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IF 5.743
Sen Li,Defu He,Shuning Li,Ruipeng Chen,Yuan Peng,Shuang Li,Dianpeng Han,Yu Wang,Kang Qin,Shuyue Ren,Ping Chen,Zhixian Gao
Bisphenol A (BPA) has emerged as a contaminant of concern because long-term exposure may affect the human endocrine system. Herein, a novel aptamer sensor based on magnetic separation and surface-enhanced Raman scattering (SERS) is proposed for the extremely sensitive and specific detection of trace BPA. Moreover, the capture unit was prepared by immobilizing thiolated (SH)-BPA aptamer complementary DNA on AuNP-coated magnetic halloysite nanotubes ([email protected]), and SH-BPA aptamer-modified[email protected]@Ag core–shell SERS nanotags acted as signal units. By the complementary pairing of the BPA aptamer and the corresponding DNA,[email protected]and[email protected]@AgCS were linked together through hybridization-ligation, which acted as the SERS substrate. In the absence of BPA, the constructed aptamer sensor generated electromagnetic enhancement and plasmon coupling to improve the sensitivity of SERS substrates. Owing to the high affinity between BPA and the aptamer, the aptamer probe bound to BPA was separated from the capture unit by an externally-induced magnetic field. Thus, the Raman intensity of the[email protected]@AuCS core–satellite assemblies was negatively correlated with the BPA concentration. High sensitivity measurements of BPA might be performed by determining the decline in SERS signal strength together with concentration variations. The proposed aptasensor is a promising biosensing platform for BPA detection.Keywords:surface-enhanced Raman scattering (SERS);aptasensor;bisphenol A;core–satellite assemblies
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Wei Zhou,Xin Wang,Youping Liu,Weikang Zhang,Xin Di
In this work, a magnetic halloysite nanotubes composite material modified with polydopamine (MHNTs@PDA) was synthesized through a facile and green synthesis strategy, and employed as an efficient adsorbent for magnetic solid-phase extraction (MSPE) of three anthraquinones. The material showed very fast adsorption ability (adsorption time of 3 min), good reusability and strong magnetic response. The main parameters affecting the extraction efficiency of MSPE, including adsorption time, amounts of adsorbent, sample pH, salt concentration and desorption conditions, were investigated and optimized. By coupling MHNTs@PDA-based MSPE with HPLC-UV, the method exhibited good linearity (R 2 ≥ 0.9944) in the concentration range of 5–1000 μg L -1 and low limits of detection (1.0–1.5 μg L -1 ) for anthraquinones. Finally, the developed method was successfully applied to determine anthraquinones in brewed slimming tea, and the obtained recoveries were in the range of 73.5–119.1%, with RSD less than 9.7%.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chujun Liang,Yunwen Shen,Yijing Qin,Dong Lu,Kaixin Li,Zhicheng Wang
Dual-mesoporous materials are hierarchical materials with both small and large mesopores. The large mesopores offer pathways for rapid molecular transport and the small pores provide a large specific surface area, conferring excellent advantages for adsorption and catalysis. Herein, novel dual-mesoporous inorganic fiber hybrid membranes were prepared by compounding a rigid multi-scale halloysite nanotube mat (HNM) and silica aerogel (SA). The results suggest that HNM is a promising inorganic support for SA, affording a dual-mesoporous membrane with superhydrophobicity (water contact angle: 152.7°, specific surface area: 244 m 2 /g, high compressive strength exceeding 3.0 MPa). The hybrid membrane featuring a novel composition, low cost, and easy preparation can be applied as a catalyst carrier to ensure the efficient synthesis of chemical raw materials, and as a filter template to block volatile organic compounds and other harmful substances. Moreover, this processing strategy is potentially useful for fabricating sensing, ultralow dielectric , or thermally insulating materials for next-generation information technologies.
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高影响因子
Journal of Energy Storage
·
2023
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IF 9.4
Wensheng Yang,Ruheng Lin,Xinxi Li,Canbing Li,Yuhang Wu,Guoqing Zhang,Xiaozhou Liu,Songbo Li,Yongzhen Wang
The thermal safety of battery module is demonstrated as the main bottleneck to hinder wider adoption of electric vehicles (EVs). It is vital to explore efficient thermal management system to satisfy the rapidly increasing need for EVs. Composite change materials (CPCMs) as passive cooling system has greatly potential application in battery packs. However, the inherent leakage and low thermal conductivity are restricted its widely utilized in practical applications. In this study, the high thermal conductivity CPCM with PEG/EG/HNT@AP has successfully prepared through a synergistic method of in situ chemical reduction and physical blending technology. Polyethylene glycol (PEG) as the phase change matrix and halloysite nanotube (HNT) as the support material can provide cross-linked network to prevent its leakage. Especially, the expanded graphite (EG) and silver nanoparticles (AgNPs) assembled into HNT (HNT@AP) play a synergistic role to construct an interconnected thermal network. The results indicates that the thermal conductivity is increased to 1.15 W·m −1 ·K −1 and the latent heat of phase change can maintain to 103.65 J·g −1 , when the content of HNT@AP is 40 %. In addition, the battery module with PEG/EG/HNT@AP and PEG/EG/ER are designed and measured during charge and discharge cycling process, respectively. It reveals that battery module with PEG/EG/HNT@AP can exhibit excellent thermal management effect, which temperature was controlled below 60 °C at 3C discharge rate even under 35 °C ambient temperature. Therefore, this work sheds light on rational design of high thermal conductive composite material to improve thermal safety of battery pack in the EVs.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 5
·2722-2737
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IF 11.9
Limei Dong,Dan Zhang,Junfeng Li,Shichong Guo,Ying Xue,Zhining Wang,Yiming Li
In view of the low fluidity caused by the high viscosity of viscous oil, a rational construction of emulsifiers with in situ heating function is highly desirable to power a high-viscosity oil emulsification process. Herein, we demonstrate a novel composite phase change material (PCM) with the dual functions of photothermal and magnetic-thermal conversion to realize the efficient Pickering emulsification of viscous oil. The superior photo/magnetic-thermal response characteristics together with its excellent energy storage and heat release properties endow the designed composite PCM with a good viscosity reduction capacity, thus greatly promoting the emulsification of viscous oil. Owing to the polydopamine (PDA) and Fe3O4 coating, the temperature of functionalized composite PCMs could rapidly reach 80.9 °C and 68.5 °C under simulated sunlight illumination and an alternating magnetic field, respectively. The viscosity of crude oil can be significantly reduced when it comes into contact with heated materials. Most importantly, due to the encapsulation of PEG, the slow release of the stored heat ensured a sustained reduction in the viscosity of the oil over a considerable period of time and greatly improved the energy utilization efficiency simultaneously. Overall, the rationally designed multifunctional composite PCM with both in situ heating characteristics and Pickering emulsification properties provides a new solution for the emulsification of high-viscosity oil.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2023
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IF 5.9
Yuanmeng Lou,Haiyun Ma,Yuqiang Jia,Sijia Sun,Mei Wang,Jianzhong Xu
Halloysite nanotubes (HNTs) have been studied and applied in the field of flame retardant. It is still a challenge to realize a facial method to accommodate more flame retardants while expanding the inner lumen of HNTs simultaneously. In this work, the inner cavity expansion and the encapsulation of aluminum hypophosphite of HNTs is obtained (AHP@HNTs) by a simple one-pot synthesis. The prepared AHP@HNTs were applied to the flame retarded Epoxy resin (EP) and the results show that AHP@HNTs can achieve better flame retardant effect at a lower addition (3 %) than individual additions of AHP or HNTs at higher addition (5 %) manifested by the reduction of the heat and smoke release. The decrease of effective heat combustion (EHC) reveals a gaseous phase flame retardant mechanism. Moreover, the environmental pollution after combustion was evaluated by an innovative method based on the particulate collection from smoke. The reduction of particulate formation and the improvement of char residue confirms the condensed flame retardant mechanism of AHP@HNTs on EP.
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高影响因子
RENEWABLE ENERGY
·
2021
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IF 8.001
Yilin Ning,Shengli Niu,Yongzheng Wang,Jianli Zhao,Chunmei Lu
This work reported the one-pot synthesis of the promising, cheap and green heterogeneous nanocatalyst for biodiesel production . The halloysite nanotube (HNT) was impregnated with 40 wt % NaAlO 2 (SA) and the assistance of ultrasonic helped to achieve a better and more stable modification. The resulting 0.4SA/HNTs-UI catalyst was applied in catalyzing the transesterification of palm oil with methanol, using a GA_BP neural network to train and predict the optimal values of reaction parameters. The test results proved the prediction accuracy of the model with R 2 = 0.989. The catalyst possessed excellent performance, and the maximum biodiesel yield of 99.15% was achieved with the catalyst loaded amount of 8.82 wt %, methanol to oil molar ratio of 16.79 and transesterification temperature of 65.12 °C. Besides, the physicochemical properties of the purified transesterification product were in accordance with the ASTM D 6751 standard of biodiesel .
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高影响因子
危险品化学品经营许可证（带存储）