Materials
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2019
·Vol. 12
·期 6
·924
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IF 2.972
Yuehua Deng,Yani Li,Wenjie Nie,Xiang Gao,Lei Zhang,Pengli Yang,Xiaochun Tan
In this work, a novel adsorbent attapulgite/graphene oxide magnetic composite (ATP/Fe3O4/GO) was synthesized for removing propranolol (PRO) from aqueous water. The factors affecting the PRO adsorption process onto ATP/Fe3O4/GO including pH, ionic strength, sorbent dosage, and humic acid were systematically investigated by batch experiments. Meanwhile, magnetic attapulgite (ATP/Fe3O4) and magnetic graphene oxide (GO/Fe3O4) were prepared for the comparison of the adsorption performance for PRO. The structural and surface characteristics of the resulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements, and scanning electron microscope. The results showed that the adsorption rate of PRO onto ATP/Fe3O4/GO was up to 99%, faster and higher than that of other adsorbents involved at neutral pH. Moreover, the adsorption kinetics were better fitted with pseudo-first-order kinetic model than the second-order kinetic model. The adsorption data were fitted well with the Freundlich isotherm equations, implying that the adsorption process was heterogeneous. The adsorption reaction was endothermic and spontaneous according to the thermodynamic parameters. All results indicated that ATP/Fe3O4/GO was a promising adsorbent for removing PRO from water.Keywords:attapulgite;propranolol;graphene oxide;adsorption;magnetic materials
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2018
·Vol. 56
·期 20
·2280-2285
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IF 2.588
Dao-Guang Teng,Xian-Yong Wei,Zheng Yang,Zhi-Min Zong
Thermostable and fluorescent poly(phenylene methylene) (PPM) was synthesized via α-Fe 2 O 3 /attapulgite (α-Fe 2 O 3 / A )-mediated polymerization of benzyl chloride (BC) in CCl 4 in good yields. A carbocationic mechanism was proposed based on the controlling experiment. The structure and properties of PPM were characterized by Fourier transform infrared spectrometry, 1 H and 13 C nuclear magnetic resonance spectrometry, thermogravimetric analysis, elemental analysis, gel permeation chromatography, and UV–vis and fluorescence spectrometry. The results show that PPM possesses outstanding homoconjugation fluorescence and excellent thermal stability with onset decomposition temperature of ca. 420 °C. Recycled α-Fe 2 O 3 / A proved to be still highly active for BC polymerization. Moreover, the strategy features low-cost and readily accessible starting materials, simple one-pot operation, and recyclable catalyst, facilitating future applications. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 2280–2285
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Cai-Yun Wang,Wen-Juan Zeng,Ting-Ting Jiang,Xi Chen,Xiao-Liang Zhang
Graphene oxide/attapulgite (GO/APT) composite membranes were successfully fabricated by the vacuum-assisted filtration for efficient dyes wastewater treatment. By characterization of FTIR, XPS, Raman, XRD and FESEM, APT nanorods were confirmed to be incorporated into GO laminar layers via grafting modification, which would influence GO interlayer distance ( d -spacing), membrane surface microstructure (laminate morphology, structure, and hydrophilicity) and even water separation performance. Comparison of those of pristine GO membrane, the calculated d -spacing of GO/APT membranes gradually increased from 0.90 nm to 1.07 nm, while water contact angles decreased from 71.0° to 43.3° with the increasing APT/GO ratios. Moreover, GO/APT membranes exhibited rough hierarchical microstructure and higher surface hydrophilicity, which was in conjunction with larger interlayer spacing to synergistically improve separation performance. The water permeated flux increased from 3.4 of pristine GO membrane to 13.3 L m −2 h −1 of GO/APT membrane with preserving high rejection nearly to 100% for 7.5 mg L −1 Rh B wastewater under optimized conditions. Similarly, membrane thickness, dye concentrations and separating species in feed solutions were also found to affect membrane separation performance. Dye molecules were efficiently rejected through GO/APT nanofiltration membranes by the synergistic separation mechanism: size exclusion effect because of the unimpeded water channels formed into 3D network laminate structure, and electrostatic interactions between the oxygen-containing functional groups on membrane surface and charged molecules. Such these GO/APT membranes demonstrated efficiently separation properties and thus provided new insight into the potential applications in water purification and dyes wastewater treatment.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
·
IF 2.8
Bo Yu,Xiaoning Li,Jiao Ma,Han Yan,Ke Lian,Pengfei Shen
BACKGROUND Arsenic contamination can exert severe detrimental effects on the ecological environment and human health. It can cause acute or chronic poisoning, resulting in cell distortion or cancer when humans come into contact with or consume arsenic-containing water. Adsorption technology is one of the effective methods for arsenic removal. In this study, using attapulgite (ATP) as a support for bimetallic iron–manganese oxides, a series of adsorbents (Fe-Mn/ATP) with different manganese-to-iron molar ratios were prepared via the coprecipitation method. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy mapping, X-ray diffraction and zeta potential measurements were used to analyze the structure and properties of Fe-Mn/ATP. In addition, the adsorption performance of the material for arsenic ions was investigated by static adsorption and dynamic adsorption experiments. RESULTS A novel Fe-Mn/ATP adsorbent was prepared using ATP as the raw material and manganese-to-iron molar ratio was 1:3 by coprecipitation at 60 °C for 1 h. The adsorption efficiency of arsenic ions was optimal at an Fe-Mn/ATP dosage of 2 g L −1 , pH 4 and a contact time of 10 min, reaching a maximum adsorption capacity of 38.27 mg g −1 at room temperature. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, indicating that arsenic ion adsorption by Fe-Mn/ATP was mainly monolayer chemical adsorption. Furthermore, Fe-Mn/ATP showed a removal rate for arsenic ions of over 80% after four cycles of regeneration, revealing a great potential for practical application. CONCLUSION This study offers a promising Fe-Mn/ATP adsorbent for removal of arsenic ions from wastewater. © 2024 Society of Chemical Industry (SCI).
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 9
·
IF 1.64
Haicun Yang,Liu Zhang,Wenzhong Ma,Hongting Pu,Fanghong Gong
A series of polymer–clay nanocomposites consisting of polystyrene (PS) and attapuglite (ATP) were prepared successfully. First, silane coupling agent containing aromatic tertiary amine groups was synthesized to functionalize ATP (M-ATP). Then, PS nanocomposites with varied clay loadings were prepared via in situ suspension polymerization process with a redox initiation system consisting of aromatic tertiary amine and benzoyl peroxide. The synthesis of silane coupling agent and functionalization of ATP were confirmed by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectra, and X-ray photoelectron spectroscopy. Mechanical properties, morphology, thermal stability, and rheological behavior of nanocomposites were investigated to illuminate the effects of M-ATP on the structure and properties of nanocomposites. Field-emission scanning electron microscope images revealed an ideal dispersion of M-ATP and an enhanced toughness of nanocomposites. The improved interface interaction between M-ATP and PS matrix endowed the nanocomposites with outstanding mechanical properties and thermal stability. The formation of hybrid network in the nanocomposites containing 3 wt % M-ATP resulted in higher complex viscosity (η*), storage modulus ( G ′), and lower loss factor (tanδ) compared with the pristine PS and PS/ATP nanocomposites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41567.
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ACS ES&T Water
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2025
·
IF 4.3
Rui Huang,Jingjing Xia,Yiding Wang,Zixuan Gao,Zeng Xue,Jinfeng Zhu,Ming Ming,Hongmin Zhao,Songxue Wang,Wenxiang Xia,Baoxiu Zhao
In this study, the CuO@ATT/AC catalyst was designed and synthesized by a simple process of immersion–doping–calcination to boost the catalytic performance toward peroxymonosulfate (PMS) and remove sulfadiazine (SDZ). The results of optimized preparation experiments indicated that the doping of the materials with AC markedly enhanced the activation of PMS, demonstrating not only superior catalytic performance but also a reduction in the leaching of Cu. The CuO@ATT/AC/PMS system achieved 96.5% SDZ removal within 60 min with only 0.03 mg/L of Cu leaching. In addition, the removal efficiency of SDZ reached above 90% across a wide pH range of 5–9 and operating temperature (25–35 °C). CuO@ATT/AC demonstrated exceptional stability and reusability, achieving a 95% removal rate for SDZ after five cycles. Furthermore, both radical and nonradical species were implicated in the degradation of SDZ. •OH, SO4•–, and 1O2 were identified as the primary reactive species involved in the system. This study presents an environmentally friendly and cost-effective composite catalyst for the degradation and elimination of organic contaminants in water.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Jing Sun,Zaixu Wang,Yongjin Dai,Moran Zhang,Xinyi Pang,Xiangfei Li,Yingjian Lu
Molds and mycotoxins pose severe threats to health. Bacillomycin D (BD) can effectively inhibit mold growth. Attapulgite (ATP) can provide a good carrier for antimicrobial agents. Natural ATP was acid-modified to obtain H-ATP. It was used to load BD to obtain a novel composite material (H-ATP-BD). The results showed H-ATP had better adsorption performance than ATP. BD was adsorbed up to 93.13 % by adding 30 mg H-ATP and stirring at 40 ℃ for 120 min. Fourier transform infrared spectra (FTIR), size and zeta potential, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) results confirmed successful loading of BD onto H-ATP. The composite showed good inhibition of Aspergillus and adding 0.6 % H-ATP-BD composite was effective in removing 89.06 % of aflatoxin B 1 (AFB 1 ) at 50 °C. Model fitting indicated that AFB 1 removal was a spontaneous exothermic reaction. This research will lay the foundation for the development of efficient and green antimicrobial and toxin-reducing materials.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Mustehsin Ali,Hongwei Shi,Faheem Jan,Sharjeel Ahmed,Yingwei Song,En-Hou Han
Ti 3 C 2 T x nanosheets, emerging as revolutionary 2D nanomaterials, have sparked interest in advanced applications due to their thin-layered architecture and promise as innovative nanofillers for a variety of applications. To address the oxidation and stacking of Ti 3 C 2 T x nanosheets with the polymer, a novel multifunctional Ti 3 C 2 T x -based nanocomposite is engineered by an etching method. The Ti 3 C 2 T x surface is functionalized with 3-aminopropyltriethoxysilane (APTES), and attapulgite (ATP) is implanted on the NH 2 -Ti 3 C 2 T x interface to lower the cohesive energy between nanosheets. The novel self-healing epoxy films were achieved by encapsulating self-healing components ((8-hydroxyquinoline (8-HQ) + 2-mercaptobenzothiazole (MBT)) in the ATP-based NH 2 -Ti 3 C 2 T x nanocomposite (AMQM). Inhibited AA2024-T3 surface revealed hydrophobic nature, whereas the pH sensitive coatings exhibited strong adherence to the substrate and improved compatibility and mechanical strength. The impedance of artificially scratched epoxy film rose from 0.073 M Ω cm 2 to 0.198 M Ω cm 2 (after 12 h) and from 0.027 M Ω cm 2 to 2.189 M Ω cm 2 (after 96 h) in comparison with the control samples. Simulations depict the presence of hydrogen bonds between the inhibitors and the 2024-T3 alloy, as well as twice the adsorption energy compared to the individual inhibitors. Therefore, a novel pH-sensitive self-healing coating offers a synergistic approach for promising corrosion suppression.
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Water
·
2024
·Vol. 16
·期 22
·3233
·
IF 3
Chun-Yan Lin,Wenliang Wu,Wenya Shao
Phosphorus removal is critical for effective water treatment and the prevention of eutrophication. This study focuses on the modification of attapulgite, an economical clay material, with zirconium (Zr@ATP) to enhance its phosphorus adsorption capacity. Zr@ATP was comprehensively characterized, and its phosphorus-removal mechanisms were investigated. Additionally, its performance in water treatment was evaluated using a lake water-sediment system. Zr@ATP exhibited a high surface area of 329.29 m2/g. The static adsorption experiments revealed that Zr@ATP achieved a phosphorus-removal efficiency of 95.8% at an adsorbent dosage of 5 g/L. Kinetic studies indicated that the adsorption followed a pseudo-second-order model, with the primary mechanism being chemisorption via ion exchange. Application of Zr@ATP in a lake water-sediment system resulted in an 83.6% reduction in total phosphorus. The chlorophyll concentration significantly decreased from 32.33 μg/L to 8.56 μg/L, and the algal density decreased by 84.6%, effectively inhibiting algal growth. These results suggest that Zr@ATP is a promising adsorbent for sustainable phosphorus removal and eutrophication control in aquatic environments.
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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.
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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.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Bo Yuan,Xiao-Qian Yin,Xiao-Qin Liu,Xing-Yang Li,Lin-Bing Sun
Much attention has been paid to metal–organic frameworks (MOFs) due to their large surface areas, tunable functionality, and diverse structure. Nevertheless, most reported MOFs show poor hydrothermal stability, which seriously hinders their applications. Here a strategy is adopted to tailor the properties of MOFs by means of incorporating carboxyl-functionalized natural clay attapulgite (ATP) into HKUST-1, a well-known MOF. A new type of hybrid material was thus fabricated from the hybridization of HKUST-1 and ATP. Our results indicated that the hydrothermal stability of the MOFs as well as the catalytic performance was apparently improved. The frameworks of HKUST-1 were severely destroyed after hydrothermal treatment (hot water vapor, 60 °C), while that of the hybrid materials was maintained. For the hybrid materials containing 8.4 wt % of ATP, the surface area reached 1302 m2·g–1 and was even higher than that of pristine HKUST-1 (1245 m2·g–1). In the ring-opening of styrene oxide, the conversion reached 98.9% at only 20 min under catalysis from the hybrid material, which was obviously higher than that over pristine HKUST-1 (80.9%). Moreover, the hybrid materials showed excellent reusability and the catalytic activity was recoverable without loss after six cycles. Our materials provide promising candidates for heterogeneous catalysis owing to the good catalytic activity and reusability.
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