APPLIED CLAY SCIENCE
·
2015
·
IF 2.467
Hao Zhao,Fengxian Qiu,Jie Yan,Jie Wang,Xin Li,Dongya Yang
A novel economical and environmentally friendly graphene/palygorskite/TiO 2 (GR/Pal/TiO 2 ) composites adsorbent was prepared and characterized by X-ray diffractometry (XRD), Fourier transform infrared (FTIR), N 2 adsorption/desorption isotherms, transmission electron-microscopy (TEM) and scanning electron microscopy (SEM). The GR/Pal/TiO 2 was applied to removal dye methylene blue (MB) and the optimum conditions of adsorption were investigated. The obtained results indicated that when the dosage of GR/Pal/TiO 2 , reaction temperature and time of the composite are 15 mg/mL, 40 °C and 1 h, respectively, the adsorption efficiency can reach 100%. The adsorption kinetic of MB followed the pseudo-second-order model while the adsorption isotherm confirms to the Langmuir model. The adsorption process is spontaneous and endothermic by thermodynamic study. Compared with other different reported materials, the novel GR/Pal/TiO 2 composite exhibits a high adsorption ability for MB removal. The obtained results demonstrate that the prepared GR/Pal/TiO 2 composites are very promising material for the removal of MB from wastewater.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 67
·62186-62192
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IF 3.289
Jianjian Cai,Shouyong Zhou,Yijiang Zhao,Ailian Xue,Yan Zhang,Meisheng Li,Weihong Xing
The hydrophilicity of a thermo-responsive PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane was enhanced via surface segregation induced by coagulation bath temperature (CBT). The N1s content of the hybrid ultrafiltration membranes prepared at 5 and 20 °C is 1.77% and 1.02%, respectively while that of the membrane prepared at 40 °C is just 0.73%. This indicated that the PNIPAAM chains could be dragged to the membrane surfaces or pores via surface segregation induced by temperature. This resulted in higher hydrophilicity and permeability as well as thermo-responsiveness for membranes prepared at lower temperatures. The initial water contact angle of the PVDF/palygorskite-g-PNIPAAM hybrid ultrafiltration membrane prepared at 5 and 20 °C is 75.2° and 75°, respectively, which is about 6° lower than the one prepared at 40 °C. A higher pure water flux (PWF) of about 366 L m−2 h−1 at 40 °C was obtained for the hybrid membrane prepared at 5 °C while the one prepared at 40 °C only reached 274 L m−2 h−1. Meanwhile, membranes prepared at low temperature exhibited fewer macrovoids, lower membrane thickness and larger elongation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Lei Jia,Youshu Zhang,Taofeng Zhu,Jun Xu
Tetracycline is abused in animal husbandry due to the role of animal growth hormone, which causes serious pollution to the natural environment and is more likely to enter the human body through the food chain, thus causing harm to human health. Therefore, the detection of tetracycline is particularly important. At present, there are many problems in the detection of tetracycline, such as high cost, low sensitivity and narrow detection range. This research mainly introduces a new fluorescent nano-probe Atta-Eu-FITC based on palygorskite to realize the detection of tetracycline in environmental samples. The nano-probe has the advantages of high sensitivity (detection limit 19 nM), wide detection range (detection linear range 0–25 μM), high visualization and strong anti-interference ability. To improve the portability and practicability of the detection, a portable fluorescent test paper and a low background fluorescent agarose gel detection platform were prepared to realize the fast sensing of tetracycline. Combined with the smartphone chroma analysis application (App), the real-time and on-site detection of tetracycline can be realized. Furthermore, the fluorescent nano-probe can also be applied for TC sensing in practical complex samples with good anti-interference ability and accuracy.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
·
IF 5.455
Guanzheng Zhuang,Li Li,Mengyuan Li,Peng Yuan
Maya blue is an ancient hybrid pigment composed of indigo and microporous palygorskite , with a fantastic hue and outstanding stability. Its color-causing and stabilization mechanism are unsolved problems. In this work, different palygorskite materials were obtained by heating at 180, 300 and 570 °C, with raw palygorskite as a reference. Maya blue-like pigments were prepared from these palygorskite materials and solid indigo. The microporous structure of palygorskite and the status of inside water molecules were investigated by thermal analysis , X-ray diffraction, Fourier transform infrared and microporous analysis. The color properties, chemical resistance and photostability of pigments were characterized by reflectance spectra, CIE color parameters and color differences after the attack of concentrated nitric acid , dimethyl sulfoxide , and visible light exposure equaling to about 100 years. It was confirmed that the greenish-blue and stable hybrid pigment could only be prepared when indigo molecules were inserted into the micropores of palygorskite. Zeolitic water molecules inside the micropores should be removed because they hindered the insertion of indigo molecules. The key to immobilizing indigo molecules inside micropores was hydrogen bonds between indigo and coordinated water (C O … …H–OH). This study emphasized the important role of micropores and hydrogen bonds in the synthesis of organic-inorganic hybrid pigments.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Min Hu,Yu Zhang,Yan Zhang,Meng Wang,Shanying Zhang,Jin Zhang,Congying Xu,Xiaoyu Liang
Pesticides are essential for controlling plant diseases and pests in modern agriculture, yet traditional formulations often suffer from poor adhesion, rapid UV degradation, and loss due to rainwater runoff. This study introduces Pro@TA-Cu 2+ -Pal, a novel pH-responsive release system designed to enhance the performance of prochloraz, a widely used fungicide. By integrating tannic acid and copper ions onto palygorskite, this nanocarrier with metal–phenolic networks improves prochloraz wettability and adhesion on leaf surfaces while significantly enhancing UV stability and rainfastness. Under UV exposure, Pro@TA-Cu 2+ -Pal showed a 3.9-fold lower degradation rate than the commercial emulsion-in-water formulation (Pro EW). In simulated rain tests, Pro@TA-Cu 2+ -Pal exhibited superior rain-fastness, retaining >80 % of the applied fungicide on leaf surfaces, whereas Pro EW showed a marked reduction in retention. Pot trials showed that Pro@TA-Cu 2+ -Pal provided excellent control against wheat powdery mildew, outperforming Pro EW in both protective and curative treatments, with more effective and sustained disease control. Importantly, Pro@TA-Cu 2+ -Pal proved safe with no phytotoxicity observed in the crop. These findings highlight the potential of Pro@TA-Cu 2+ -Pal as an economical, eco-friendly, and sustainable solution for improving pesticide efficiency, reducing environmental impact, and supporting long-term crop protection.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 32
·50779
·
IF 3.125
Dewen Sun,Yingjie Ma,Liqun Lu,Shuai Qi,Pingping Hou,Bo Li,Qianping Ran,Jiaping Liu,Jinxiang Hong
The synthesis process of dopamine hydrochloride functionalized palygorskite (Pal) nanoparticles (Pal@PDA) is optimized by adjusting the mass ratio of them. The optimal preparation technology of the Pal@PDA is determined by scanning electron microscopy and comparing the adhesive strength between the biomimetic protective coatings and dry and water saturated concrete surface. When the mass ratio of dopamine hydrochloride to Pal is 1:4, the prepared Pal@PDA does not contain excess polydopamine (PDA) nanoparticles and the coatings incorporating the Pal@PDA have the highest adhesive strength on dry and water saturated concrete surface at the same conditions. Compared with the pure epoxy primer, the adhesive strength between the epoxy primer incorporating 5 wt% Pal@PDA and the water saturated concrete surface increases by 25.69% (from 3.282 to 4.125 MPa). Furthermore, the Pal@PDA is embedded into pure epoxy resin to prepare the biomimetic resin composites, the tensile strength and compressive strength of the composites incorporating 5 wt% Pal@PDA are 91.20% and 34.77% higher than that of pure epoxy resin, respectively. Further studies confirm that the active groups on the Pal@PDA surface form the stable covalent and non-covalent bonds with epoxy primer and the water saturated concrete surface, which is the major mechanism of improving interfacial adhesion.
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CLAYS AND CLAY MINERALS
·
2020
·Vol. 68
·期 1
·1-8
·
IF 1.507
Chen Le,Qian Jun-Yan,Yang Chuang,Xu Ping-Ping,Zhu Dan-Dan,Zhong Jing,He Ming-Yang,Chen Qun,Zhang Zhi-Hui
The efficient separation of hexane isomers from the light naphtha fraction is a significant challenge in the petrochemical industry. 5A zeolite adsorbent is used commercially to sieve alkane isomers. In this study, 5A zeolites were synthesized using a low-cost natural clay mineral precursor, i.e. palygorskite (PAL), with the addition of crystallization directing agent (CDA). By varying the mass ratio of CDA/deionized water, 5A zeolites were obtained as CDA-5%, CDA-7.5%, and CDA-10%. All products were submicron particles with an average particle size of 400–800 nm. A sieving test of CDA-induced 5A zeolites was carried out on hexane adsorbates including n -hexane ( n HEX), 2-methylpentane (2MP), and 3-methylpentane (3MP). According to vapor-phase batch adsorption experiments, a significant equilibrium amount (0.149 g/g) of n HEX and only 0.0321 g/g 2MP and 0.0416 g/g 3MP were adsorbed on the 5A zeolite product with CDA-5%. The dynamic adsorption performance of 5A zeolite (CDA-5%) was evaluated by breakthrough curves of binary mixtures of n HEX/2MP and n HEX/3MP. Palygorskite 5A (PAL 5A) zeolite achieved maximum dynamic adsorption capacities of n HEX (0.16 g/g in both cases) at 200°C and 1.2 MPa total pressure. This work provided an economic alternative for the synthesis of 5A zeolites using natural clay minerals instead of chemical raw materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Chun Huang,Yulan Wang,Miao Gong,Wei Wang,Yang Mu,Zhen-Hu Hu
The discharging of Rhodamine B (RhB) from wastewater has caused huge environment pollution. Peroxymonosulfate (PMS) oxidation is an effective way to remove it from wastewater. However, finding an environmentally friendly metal to activate PMS is a key step for the oxidation process. In this study, nanorod α-MnO 2 loaded palygorskite (α-MnO 2 /Pal) was fabricated by a simple hydrothermal method. The analysis of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) confirmed the loading of α-MnO 2 on the surface of Pal and characterized the surface of the composite. The surface area of α-MnO 2 /Pal composite was 159.13 m 2 /g, which was much higher than that of Pal and α-MnO 2 . The Pal, α-MnO 2 , Mn 2+ , and α-MnO 2 /Pal were used to activate PMS for RhB degradation. Nearly 100% RhB degradation was obtained in α-MnO 2 /Pal + PMS system in 180 min and in α-MnO 2 + PMS system in 300 min, while only 50% degradation was obtained in Pal + PMS system and 71.4% degradation in Mn 2+ + PMS system in 300 min. The degradation fitted the pseudo-first-order reaction kinetics well with rate constant of 0.02041 min −1 for α-MnO 2 /Pal + PMS system, 0.01192 min −1 for α-MnO 2 + PMS system, and 0.00435 min −1 for Mn 2+ + PMS system, respectively. The factors affecting RhB degradation were further investigated. The RhB degradation efficiency increased with the increase of α-MnO 2 /Pal dosages, PMS dosages and temperatures. The degradation was inhibited at pH > 5.5, while was favorable at pH < 5.5. The major reactive radicals responsible for RhB degradation classified by radical quenching experiment were O 2 − and 1 O 2 . The possible mechanism was further proposed based on the results. The α-MnO 2 /Pal composite showed nearly 50% mineralization ratio in the presence of PMS and an excellent reusability. The results from this study revealed that α-MnO 2 /Pal composite is an effective catalyst to activate PMS for RhB degradation.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 26
·
IF 1.768
Jia Lu,Jie Wu,Jing Chen,Yeling Jin,Tao Hu,Keisha B. Walters,Shijie Ding
The poly(2-(diethylamino)ethyl methacrylate)/palygorskite (PDEAEMA/PAL) composite microspheres were prepared via Pickering emulsion polymerization using palygorskite (PAL) as an emulsifier. The morphology, chemical structure, and content of PDEAEMA/PAL composite microspheres were investigated by polarizing optical microscopy, scanning electron microscopy (SEM), Fourier-transform infrared (FT-IR) spectroscopy, and thermal gravimetric analysis (TGA). The pH-responsive behavior of composite microspheres was studied by measuring their size at different pH values. Furthermore, their release behavior was investigated using rhodamine B (RhB) as a model molecule. It was proven that the release properties of RhB from PDEAEMA/PAL composite microspheres could be controlled by adjusting the pH values. The study of release kinetics found that Higuchi model was fit for RhB release from PDEAEMA/PAL composite microspheres at pH 5.0, 7.4, and 10.0. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42179.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-14
·
IF 5.228
Wang Wenbo,Tian Guangyan,Wang Dandan,Zhang Zhifang,Kang Yuru,Zong Li,Wang Aiqin
A mesoporous hybrid silicate microsphere with superior adsorption performance has been successfully synthesized by employing an “all-into-one” strategy and a simple one-pot hydrothermal process using naturally abundant low-grade red palygorskite (PAL) clay as raw material in the presence of non-toxic SiO 3 2− and Mg 2+ ions. As is expected, both the PAL and associated minerals transformed into a new amorphous mesoporous hybrid silicate microsphere without using any additional pore-forming template. The mesoporous silicate microsphere shows a large pore size of 37.74 nm, high specific surface area of 489.81 m 2 /g (only 54.67 m 2 /g for raw PAL) and negative surface potential of −43.3 mV, and its maximum adsorption capabilities for Methylene bule (MB) and Crystal violet (CV) reach 407.95 mg/g and 397.22 mg/g, respectively. Meanwhile, 99.8% of MB (only 53% for raw PAL) and 99.7% of CV (only 43% for raw PAL) were sucessfully removed from 200 mg/L of initial dye solution by only using 1 g/L of the adsorbent. In addition, the spent adsorbent can be easily regenerated and repeatly reused for muptiple cycles. The study on adsorption mechanism revealed that electrostatic attraction, hydrogen bonding and chemical complexing interactions are the main factors contributed to the high dye adsorption.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Guangyan Tian,Wenbo Wang,Li Zong,Yuru Kang,Aiqin Wang
As promising eco-friendly materials, natural silicates have received great attention as abundant, low-cost, non-toxic, stable, and environmentally benign adsorbents. Inspired by the idea of “from nature, for nature”, a series of highly efficient hybrid silicate adsorbents were synthesized via a simple one-step hydrothermal process, using naturally abundant low-grade palygorskite (PAL) as the initial material in the presence of sodium silicate (SS), magnesium sulfate (MS), and monochloroacetic acid (MCA). As expected, the PAL crystal and the associated minerals were restructured as amorphous and multi-porous Mg, Al-silicates, while the active COOH groups were simultaneously introduced into the silicate to form a hybrid adsorbent with a specific surface area of 410.61 m 2 /g (compared to 52.87 m 2 /g for raw PAL). The hybrid silicate adsorbent showed excellent adsorption capabilities for the antibiotics chlortetracycline (CTC) (329.84 mg/g) and oxytetracycline (OTC) (207.47 mg/g), which were enhanced by 218.9% and 107.9%, respectively, in contrast to that of raw PAL. The adsorption of the hybrid adsorbent for CTC and OTC was pH-dependent, and the pH values of 3.56–7.82 (for CTC) and 3.45–7.57 (for OTC) favored the adsorption. The dynamic adsorption process was well described by a pseudo second-order model, which suggested that chemical adsorption was the prominent driving force. The thermodynamic adsorption pattern agreed well with the Redlich–Peterson model, revealing that the heterogeneous surface was the main adsorption site and that removal of antibiotics occurred mainly by multi-layer adsorption.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Yangping Wen,Juan Chang,Lanjiao Xu,Xiaoning Liao,Ling Bai,Yingdong Lan,Mingfang Li
Abnormal level of purines , especially uric acid (UA), xanthine (XA) and hypoxanthine (HX) in organisms is an important marker for early diagnosis of animal (human) disease. In this paper, an simultaneous analysis of UA, XA and HX in biological samples was successfully realized using the fabricated voltammetric sensor based on the nanocomposite of both nano-rod clay mineral palygorskite (Pal) and two-dimensional nano-layered nitrogen doped graphene (NG). A water-soluble carboxymethyl cellulose (CMC) salt was simultaneously decorated both Pal and NG to improve the water dispersibility, and their nanocomposite was characterized. Under optimized conditions, The as-prepared nanocomposite electrode (CMC-Pal-NG/GCE) could realize their simultaneous voltammetric analysis in linear ranges from 0.5 to 60 μM for UA, 0.2 to 20 μM for XA, and 0.6 to 55 μM for HX. The limit of detection of three purines (UA,XA and HX) is calculated to be 0.1 for UA, 0.05 for XA and 0.4 μM for HX, and their possible detailed mechanisms for electro-catalytic oxidation and chemical reaction was discussed, which was successfully empolyed for simultaneous voltammetric analysis of three purines in real samples with good reproducibility, repeatability and stability. Satisfactory results indicated that the obtained nanocomposite will provide a promising candidate for the simultaneous electrochemical determination of UA, XA and HX in analysis of practical samples.
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