http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Removal of Cu2+ from aqueous solution by adsorption onto mercapto functionalized palygorskite
Jun Han,Xuefeng Liang,Yingming Xu,Yuanjian Xu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
In order to enhance sorption capacity of palygorskite for heavy metals, mercapto functionalized palygorskite (MPAL) were prepared and utilized for the sorption of Cu2+ from aqueous solution. Sorption kinetic and thermodynamic experiments were conducted to assess the sorption behavior and application potentials for the remediation of heavy-meta-polluted soil. Sorption mechanisms were investigated by XRD, FT-IR, 29Si CP/MAS NMR, SEM-EDS and XPS in detail. The maximum sorption amount of Cu2+ on MPAL was approximately 30 mg/g, which was 10 times more than pristine palygorskite. Freundlich isotherm describes the sorption data better than other isotherms, and pseudo second order kinetic model fit the sorption kinetic processes well. The positive enthalpy change confirmed that the sorption process of MPAL was endothermic and the positive entropy changes revealed that sorption of Cu2+ was driven by entropy changes. Further characterization analyses and the ‘‘Hard and Soft Acids and Bases theory’’ for mechenism research exhibited the complexation existence of Cu2+ with mercapto groups. The good performance demonstrated that MPAL has great potential application values in removal of heavy metals both from aqueous and soils.
Chae, H.S.,Zhang, W.L.,Piao, S.H.,Choi, H.J. Elsevier 2015 Applied clay science Vol.107 No.-
Palygorskite (Pal) clay coated with semiconducting polyaniline (PANI) nanocomposite particles was prepared by oxidative polymerization using aniline monomer in the presence of Pal. The morphological characteristics of the synthesized Pal/PANI composite particles were examined by both field emission scanning electron microscopy and transmission electron microscopy. A rotational rheometer was also used to examine the rheological behavior of the Pal/PANI composite-based electrorheological (ER) fluid when the nanocomposite particles were dispersed in silicone oil. From its flow curve of shear stress vs. shear rate investigated under an applied electric field, the typical ER behavior of the Pal/PANI-based ER fluid was observed. In addition, polarizability and relaxation time of the ER system obtained from the dielectric spectra were well correlated with its ER performance.
JIAHUI ZHANG,Lili Zhang,JIN HUANG,Shouyong Zhou,Haiqun Chen,WEIGUANG ZHANG,Xin Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Palygorskite (denoted as Pal) was used as an economical carrier of hybrid photocatalystTiO 2 – FexOy via an in situ depositing technique (marked as Pal – TiO 2 – FexOy). The samples werecharacterized by X-ray di®raction (XRD), transmission electron microscopy (TEM), brunner-emmet-teller (BET) measurements, X-ray photoelectron spectroscopy (XPS) and UV-Vis di®usere°ectance spectra measurements. Results showed that TiO 2 – FexOy composite particles withaverage size of about 10 nm were loaded onto the Pal ¯bers' surface. FexOy acted not only asmagnetic source but also took part in the formation of TiO 2 – FexOy heterojunction structure, which resulted in the obvious absorption in visible light region for the obtained Pal – TiO 2 – FexOy com-posite photocatalyst. The obtained Pal – TiO 2 – FexOy shows excellent photocatalytic activity to-ward photodegradation of Methyl orange (MO) under visible light irradiation and the degradationratio reached 94% within 180 min. Moreover, Pal – TiO 2 – FexOy could be readily recovered from thereaction solution by the magnet. Possible mechanism for the enhancement was also proposed.
Reinforcement of Waterborne Polyurethane Films with Poly(acrylic acid)-Modified Palygorskite Fibers
Yu Mao,Lingli Ni,Changyou Yang,Peng Cai,Weigang Du,Xiaoyan Gao 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
Palygorskite (PAL) is a natural fibrous clay mineral which attracted tremendous attention as reinforcing agent topolymers. In this paper, a facile and environmental friendly modification process of PAL by poly acrylic acid (PAA) via insitupolymerization in PAL/water gel has been reported. The effects of PAA modified PAL (PAA-PAL) on the mechanical andthermal properties of waterborne polyurethane (WPU) nanocomposites have been investigated. Scanning electronmicroscopy (SEM) demonstrated that the dispersion of PAL has improved dramatically after PAA modification. Tensile testsshowed that PAA-PAL has a significant reinforcement effect on WPU matrix. Addition of 10 wt% PAA-PAL, the tensilestrength and the Young’s modulus of WPU composites increased 235 % and 388 %, respectively. Furthermore, the thermalstability of WPU also has been distinctly improved via addition of PAA-PAL.
Lingli Ni,Pengyin Zhang,Jing Chen,Jinglong Jiang,Shijie Ding 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
Palygorskite (PAL) as a natural one-dimensional nanomaterial has attracted tremendous attention as reinforcement agent in polymer nanocomposites. But its intrinsic existing form of aggregates or bundles and hydrophilic properties, highly requires an eco-efficient and environmentally benign approach for both of the disaggregation and organo-modification of PAL. We report a facile and effective process to achieve individualized organo-modified PAL fibers. It was carried out through surface modification reactions in the form of PAL iso-propanol gels with various alkyl and functional silanes. In contrast to the modifications in highly toxic solvent of toluene, reactions in iso-propanol make it possible to modify the surface of individual PAL fibers to obtain isolated organo-modified PAL fibers. With such a relatively green procedure, even higher amount of organic substituent has been grafted on to the surface of PAL fibers. Consequently, excellent dispersion of modified PAL nanofibers in acrylate polymer coatings was achieved, which exhibits outstanding corrosion protection properties.
Anne Beatriz Figueira Câmara,Rafael Viana Sales,Carlos Vital dos Santos Júnior,Miguel Angelo Fonseca de Souza,Clenildo de Longe,Thiago Medeiros Chianca,Rosangela Dala Possa,Luiz Carlos Bertolino,Lucie 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Palygorskite clay mineral (Pal) was employed in the removal of Congo red (CR) and methylene blue (MB)dyes pollutants in aqueous effluents by the adsorption process. The materials, Pal raw and acid Pal (Apal), were characterizedby SEM, EDX, XRD, XFR, FTIR, XPS and Raman spectroscopy techniques that evidenced the main active sitesof clay mineral. Characterization data indicated that acid treatment caused a leaching process of metallic cations on thePal surface. As result, the maximum adsorption capacity was increased from 11.3 to 120.5mg·g1 and from 2.7 to238.1mg·g1 for MB and CR dyes, respectively. The regeneration result after five cycles was of 75% recovered to MBadsorption into Apal. Semi-empirical quantum mechanical (SQM) calculations were performed to identify the mechanismof interaction between the Pal surface and dyes. High correlation (R2>0.99) was observed for the experimentaldata using the pseudo-second-order kinetic model, that were confirmed by computed enthalpy values (298.7 to 84.5 kJ·mol1), suggesting a chemisorption process as the determining step. Furthermore, the experimental and computationalresults indicated that the Pal also could work removing efficiently two dyes simultaneously with an adsorptioncapacity of 37.2 and 40.4mg·g1 for MB and CR, respectively.
A Sb2Se3/Palygorskite Nanocomposite Catalyst for p-Nitrophenol Reduction
Lin Tan,Aidong Tang,Muen He,Xin Wen,Laifu Zhong,Peng Yan,Jing Chenc,Yi Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.9
A nanocomposite consisting of rod-like Sb2Se3 and fiberous palygorskite (Pal) was prepared using cetyltrimethyl ammonium bromide (CTAB) as a pillaring agent to change Pal microstructure. CTAB optimal dosage was 0.2 g (versus 0.388 g of Pal). Sb2Se3/Pal has a high catalytic activity towards the catalytic reduction of p-nitrophenol to p-aminophenol while in the presence of NaBH4 at room temperature. The excellent performance is attributed to dispersion of rod-like Sb2Se3 in fiberous Pal which promoted more active sites exposure. The results provide new ideas for preparing new catalysts.
Weili Yang,Yueping Chen,Yefei Cheng,Chao Wen,Yanmin Zhou 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.7
Objective: This study was conducted to investigate effects of zinc (Zn) bearing palygorskite (ZnPal) supplementation on growth performance, hepatic mineral content, and antioxidant status of broilers at early age. Methods: A total of 240 1-day-old Arbor Acres broiler chicks were allocated into 5 treatments with 6 replicates of 8 chicks each. Birds in 5 treatments were fed a basal diet supplemented with 0 (Control group; Analyzed Zn content: 81 mg/kg), 20, 40, 60, and 80 mg/kg Zn as ZnPal for 21 days, respectively. Blood, liver and intestinal mucosa were collected at 21 days of age. Results: Treatments did not affect growth performance of broilers during the 21-day study (p> 0.05). The contents of hepatic Zn and magnesium (Mg) were linearly increased (p<0.001) by ZnPal supplementation. ZnPal inclusion linearly (p = 0.007) reduced malondialdehyde (MDA) concentration in serum. The activity of total superoxide dismutase (T-SOD) in liver increased linearly (p = 0.001) with concentration of ZnPal in diet. ZnPal inclusion linearly (p = 0.036) and quadratically (p = 0.005) increased T-SOD activity, and linearly (p = 0.012) increased copper/zinc superoxide dismutase (Cu/Zn SOD) activity in jejunal mucosa. The maximum responses of hepatic and jejunal antioxidant enzymes activities (T-SOD and Cu/Zn SOD) were found when supplementing the basal diet with 60 mg/kg Zn as ZnPal. Furthermore, ZnPal supplementation quadratically (p = 0.001) increased Cu/Zn SOD activity in ileal mucosa, and its maximum activity was observed in the diet supplemented with 20 mg/kg Zn as ZnPal. Conclusion: ZnPal supplementation did not alter growth performance of broilers. Dietary ZnPal inclusion could increase concentrations of hepatic trace minerals (Zn and Mg) and inhibit lipid peroxidation by reducing serum MDA accumulation, with the optimal dosage of Zn from ZnPal being 80 mg/kg diet (analyzed Zn content in the diet: 165 mg/kg), and 60 mg/kg Zn as ZnPal (analyzed Zn content in the diet: 148 mg/kg) was the optimum dosage for broilers to achieve maximum antioxidant enzyme activities.