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.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Siwen Wang,Zihang Xu,Tao Xu
The attapulgite (ATP) is one of important raw materials of ceramics and often used as a loading carrier. To control the release rate of composite flame retardant (CFR) when exposed to a fire, and to meet the multi-stage flame retarding requirements, the vacuum negative pressure method was adopted to load four kinds of monomer flame retardants on porous ATP as a carrier after activating pretreatment, respectively. Then CFR nanoparticles with controlled-release effects were prepared by the in-situ polymerization reaction on the surface of monomer flame retardants. After that, zinc hydroxyl stannate , styrene, melamine formaldehyde resin and silicon dioxide with high thermal stability and excellent flame retarding properties were selected as the coating layer of four kinds of monomer flame retardants on ATP carrier. Test results of environmental scanning electron microscope and energy dispersive spectrometer show the satisfactory loading and coating results of CFR nanoparticles. Test results of X-ray photoelectron spectroscopy further confirm the excellent loading conditions and coating film formation on ATP carrier. The thermogravimetry-differential thermal scanning calorimetry tests indicate that the flame retarding duration of both loaded and coated CFR nanoparticles on ATP carrier is prolonged and has a satisfactory controlled-release effect.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Hengyang Mao,Peng Xu,Shouyong Zhou,Zhaoru Fan,Ailian Xue,Meisheng Li,Yijiang Zhao,Aiqin Wang,Zhentao Wu,Yiqun Fan
Nanofiber membranes are distinguished for their high porosity and interconnected pore structures . However, their separation application and performances are affected by irregular pore structures which are formed by the randomly packing of nanofibers. Herein, we report a facile approach to produce nanofiber membranes with oriented channels, narrow pore size, and low tortuosity. The membranes show a bi-layered structure where magnetic attapulgite (mATP) nanofiber layers are directly supported on macroporous Al 2 O 3 substrates. The mATP layers are prepared by drop-coating suspensions on top of the substrates pre-filled with water, and the ordered pore structures are formed at the presence of a magnetic field. Compared with the unordered membranes, average pore size of the ordered membranes reduces from 0.45 to 0.28 μm, with the water permeance increase from 1007 to 1121 L m −2 h −1 ·bar −1 . Moreover, the stationary flux of ordered membranes increase by 59% with the retention to oil-in-water emulsion increase from 98.7% to 99.2%. Analysis of membrane fouling using the Hermia model shows that the ordered membrane can reduce membrane blocking and thus facilitate membrane cleaning and restore of separation performance.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Minerals
·
2018
·Vol. 8
·期 9
·387
·
IF 1.835
Rongqing Cheng,Haipeng Li,Zhiliang Liu,Chunfang Du
In this work, halloysite nanotubes (HNTs) without modification were used as an efficient adsorbent to explore its natural adsorption capability, which showed excellent adsorption ability for low-concentration ciprofloxacin (CIP). The physicochemical properties of HNTs before and after adsorption were investigated by several characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), N2adsorption–desorption analysis, X-ray diffractometer (XRD), and zeta potential analysis. The influences of temperature, initial CIP concentration, adsorbent dosage, and pH value on CIP adsorption performance were also studied. The kinetics analysis revealed that CIP adsorption on HNTs was a kind of monolayer adsorption process and followed a pseudo-second-order rate equation. The zeta potential result indicated that electrostatic interaction between HNTs and CIP molecules was possibly responsible for the adsorption performance. Moreover, HNTs showed no apparent loss in CIP adsorption capability after five cycles, exhibiting potential applications in wastewater treatment.Keywords:halloysite nanotubes (HNTs);adsorption;antibiotics;ciprofloxacin;natural adsorption capability
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Jian Wang,Jiwen Si,Yizhan Hao,Jingyao Li,Peiping Zhang,Chuanxiao Zuo,Bo Jin,Yan Wang,Wei Zhang,Wenqing Li,Ruifeng Guo,Shiding Miao
Halloysite-based tubular nanorockets with chemical-/light-controlled self-propulsion and on-demand acceleration in velocity are reported. The nanorockets are fabricated by modifying halloysite nanotubes with nanoparticles of silver (Ag) and light-responsive α-Fe2O3 to prepare a composite of Ag–Fe2O3/HNTs. Compared to the traditional fabrication of tubular micro-/nanomotors, this strategy has merits in employing natural clay as substrates of an asymmetric tubular structure, of abundance, and of no complex instruments required. The velocity of self-propelled Ag–Fe2O3/HNTs nanorockets in fuel (3.0% H2O2) was ca. 1.7 times higher under the irradiation of visible light than that in darkness. Such light-enhanced propulsion can be wirelessly modulated by adjusting light intensity and H2O2 concentration. The highly repeatable and controlled “weak/strong” propulsion can be implemented by turning a light on and off. With the synergistic coupling of the photocatalysis of the Ag–Fe2O3 heterostructure and advanced oxidation in H2O2/visible light conditions, the Ag–Fe2O3/HNTs nanorockets achieve an enhanced performance of wastewater remediation. A test was done by the catalytic degradation of tetracycline hydrochloride. The light-enhanced propulsion is demonstrated to accelerate the degradation kinetics dramatically. All of these results illustrated that such motors can achieve efficient water remediation and open a new path for the photodegradation of organic pollutions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Smart Materials and Structures
·
2014
·Vol. 23
·期 7
·075005
·
IF 2.449
Ting Jin,Yuchuan Cheng,Ru He,Yuxia Luo,Meng Jiang,Chao Chen,Gaojie Xu
Attapulgite (ATP) is a type of crystalloid hydrous magnesium-aluminum silicate mineral with natural one-dimensional (1D) fibrous morphology. In this study, the authors investigated the optical and mechanical performances of ATP nanorods in silicone oil under an electric field. It was observed that the optical transmittance of ATP suspensions decreased rapidly under the low electric field, using ultraviolet-visible (UV-Vis) spectroscopy. The results of optical microscopy and scanning electron microscopy (SEM) indicated that the electromigration of ATP nanorods was the major cause of such an aberrant optical phenomenon. Further, the electrorheological (ER) response of the samples was measured by the height-controlled method. The change trend of the normal force was illustrated by the dynamic assembly behavior of ATP in the applied electric field. This work provided intuitive evidence for an in-depth understanding of the mechanism of ER fluids containing 1D dielectric materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yue Pan,Zhaoqi Zhu,Min Li,Yanjun Chen,Chenchen Cheng,Mingxing Wang,Hanxue Sun,An Li
The frequent occurrence of oil spill accidents and the massive discharge of oily wastewater have become serious environmental pollution problems. Herein, we report a facile and easy method for fabricating superhydrophobic halloysite-based aerogels (PDMS@HNCS) through mixing halloysite and chitosan without cross-linking agents. The as-prepared aerogel with an aligned tubular channel structure has low density (41.98–52.83 mg cm–3) and robust mechanical properties because of the directional freezing and freeze-drying method. The dip-coating method and heat treatment of the halloysite-based aerogels with PDMS endow them with superhydrophobic properties, which is beneficial for selective adsorption and separation of oil–water mixtures, and the contact angle with water of PDMS@HNCS aerogels can reach 151.4°. The adsorption capacity of the aerogel for various oils or organic solvents is 10.13–22.61 g g–1. Besides, the aerogel can separate various water-in-oil emulsions with high separation efficiencies of up to 99.90%. Overall, clay-based aerogels have gradually attracted attention in the field of oil–water separation owing to their low density, good absorption properties, and biocompatibility, and this work may develop a new approach to fabricating materials for efficient oil–water separation by using a simple method and low-cost materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Pierre Dramou,Meriem Fizir,Abdoh Taleb,Asma Itatahine,Nasiru Sintali Dahiru,Yamina Ait Mehdi,Liu Wei,Jingyi Zhang,Hua He
In this research, to achieve enhanced intracellular uptake of anticancer drug carriers for efficient chemotherapy, folic acid conjugated chitosan oligosaccharides assembled magnetic halloysite nanotubes (FA-COS/MHNTs) have been tailored as multitask drug delivery system towards camptothecin (CPT). Besides magnetic targeting, the nanocomposites have been reacted with folate complex in order to selectively target cancer cells over expressing the folic acid receptor. HNTs showed to have a high storage capacity of CPT. In vitro, the release results indicated that CPT outflow from the nanocarriers at pH 5 was much greater than that at both pH 6.8 and 7.4. MTT assays showed that the CPT-loaded nanocarriers exhibited stronger cell growth inhibitory against colon cancer cell. Furthermore, nanocarriers gained specificity to target cancer cells because of the enhanced cell uptake mediated by FA moiety and presence of COS. Therefore, the rational designed HNTs nanocarrier for chemotherapy drug showed great potential as tumor-targeted drug delivery carrier.
研究领域:
生物医学工程
·
肿瘤学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Wentao He,Huahui Xu,Pingan Song,Yushu Xiang,Shuhao Qin
Flame-retardant functionalized nanomaterials have attracted much research interests due to the combined advantages of organic and inorganic components. In the present study, P, N-decorated halloysite nanotube (MA-PPA@HNT) was prepared via simple steps of phenphosphinic acid intercalation and subsequent electrostatic interaction with melamine. Compared to unmodified HNT, the incorporation of MA-PPA@HNT into polyamide 6 (PA6)/aluminum diethylphosphinic acid (AlPi) composite results in significant improvement of flame retardancy. At equal HNT loading of 2wt%, the UL-94 rating grade of PA6/AlPi/MA-PPA@HNT composite was V-0, whereas that of PA6/AlPi/HNT composite V-2. And compared with PA6 , there is a decrease of peak heat release rate (pHRR) and total heat release (THR) by 72.6% and 17.4%, respectively. The flame retardant mechanism was analyzed by cone calorimetry, gas volatility and characterization of char residues. It is considered that MA-PPA@HNT plays the critical role of promoting the formation of P, Si-rich intumescent char in the condensed phase and enhancing the barrier effect for heat and mass transfer.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Qingqing Li,Yuxin Gong,Ting Du,Liang Zhang,Yiyue Ma,Tong Zhang,Zhiyi Wu,Wentao Zhang,Jianlong Wang
Conventional “all-in-one” methods for multi-component active packaging systems are not wholly adequate for fresh food. Given the need for multifunctional properties, introducing halloysite nanotubes (HNTs) could be a promising way to achieve controllable release of active ingredients while endowing with pH-sensitive performance. Here, we pioneered a GRAS composite with multifunctional properties, employing natural HNTs as a nanocarrier, citral (Cit) as an active antimicrobial agent, and myricetin (Myr) for monitoring freshness. The Cit-HNTs-Myr had excellent DPPH, ABTS and ·OH radical scavenging capacity, dual-model (contact and fumigant) antibacterial properties, and pH-sensitive performance. Subsequently, a smart tag prepared by dipping cellulose fibers into Cit-HNTs-Myr, which extended the shelf life of shrimp and blueberries, and provided freshness information for the shrimp. These results demonstrate the applicability of Cit-HNTs-Myr in the preservation of perishable goods and freshness monitoring.
研究领域:
食品科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2021
·
IF 2.262
Jing Zhang,Hailin Yu,Yu Liang,Zhengnan Sun,Yang Liu,Guolin Jing
In this paper, the organic nano-sepiolite was modified to obtain highly dispersibility in the oil phase, and then, EVA (ethylene-vinyl acetate)/nano-sepiolite was prepared by melt blending. The effects of un-doped/doped different NPPDs oil samples on the pour point, gel point, viscosity, and yield value of Daqing crude oil were evaluated. The changes of wax crystal morphology at low temperature were observed by polarizing optical microscopy (POM). The results show that due to the heterogeneous nucleation mechanism and high dispersion in the oil phase, EVA/nano-sepiolite has a better effect on reducing pour point and makes EVA have a higher local concentration in the oil phase, which weakens the wax crystal structure, and greatly improved the low temperature rheology of Daqing crude oil. Compared with pure EVA, EVA/nano-sepiolite can further reduce the pour point, gel point, viscosity, and yield value of Daqing crude oil at the optimum additive concentration of 200 ppm. Among them, it can further reduce the pour point 2 °C and further reduce the gel point 0.93 °C; at 15 °C, the viscosity reduction rate was 20% and the yield value at 15 °C was reduced by 82%.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 3
·1369-1380
·
IF 2.302
Liu Bin,Xia Yang,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
To improve the dispersion stability of rod-like attapulgite (ATT) in polymers, a small amount of graphene oxide (GO) nanosheets were employed as a supporter to fix ATT before introducing into polymer. The ATT nanorods were found attached tightly and dispersed uniformly on the GO nanosheets from TEM images of GO-ATT hybrids. The dispersion stability of ATT in water was also improved after being attached on GO nanosheets due to the abundant hydrophilic groups of GO, which was paramount for introducing them into polymers through water blending method. Poly(vinyl alcohol) (PVA) was then chosen to be reinforced by these GO-supported ATT via water blending method. Compared to the heavy aggregation of neat ATT in PVA, a homogeneous distribution of ATT nanorods in the matrix was achieved by introducing them in the form of GO-ATT, indicating a favorable assisted dispersion effect of GO nanosheets for ATT. Furthermore, PVA/GO-ATT nanocomposites containing only 2 wt% GO-ATT exhibited a significantly increase of 41.4 and 83.6 % in tensile strength and storage modulus, respectively.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）