RSC Advances
·
2015
·Vol. 5
·期 72
·58393-58402
·
IF 3.84
Yuanyuan Xu,Jinming Sun,Hou Chen,Liangjiu Bai
This study describes reversible addition–fragmentation chain-transfer (RAFT) polymerization initiated by cobalt(III) acetylacetonate (Co(acac)3). With Co(acac)3 as the initiator, RAFT polymerization of acrylonitrile was achieved at 90 °C mediated by 2-cyanoprop-2-yl dithionaphthalenoate. The polymerization exhibited “living”/controlled characteristics with a molar mass distribution as low as 1.25. Homogeneous polyacrylonitrile nanofibers (PAN-nFs) were produced via the electrospinning technique. FTIR, SEM and TGA analyses revealed aminated-PAN-nFs (APAN-nFs) were successfully obtained via ethylenediamine grafting onto the surface of PAN-nFs. The adsorption interaction between methyl orange (MO) dye and APAN-nFs is discussed in detail. The maximum saturation adsorption capacity was 102 mg g−1. The adsorption kinetics followed a pseudo-second-order model. The Langmuir model was better for interpreting the isothermal process for MO and APAN-nFs. The Dubinin–Radushkevich isothermal model indicated that the adsorption proceeded chemically. Intraparticle diffusion was not the only rate-limiting step. The thermodynamics properties indicated the adsorption process was exothermic and spontaneous in nature. The MO dye adsorbed by APAN-nFs could be reversibly desorbed by an aqueous solution of pH = 1. APAN-nFs could be recycled efficiently.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xue Gao,Zhong-Kun Li,Jian Xue,Yong Qian,Li-Zhi Zhang,Jürgen Caro,Haihui Wang
Highly effective air filters are needed because of the increasing harm caused by air particulate matter pollution. Herein, two-dimensional titanium carbide Ti 3 C 2 T x MXene nanosheets with active surface-terminating groups (O, OH and F) were used to modify the polyacrylonitrile (PAN) nanofiber filters to strengthen their interaction force with PM2.5 . These forces were measured quantitatively through the force-distance curve-based AFM showing that the MXene modification of the PAN fiber induces three times larger interaction forces than before. The obtained filters show high PM2.5 removal efficiency of ∼99.7% with a low pressure drop of ∼42 Pa. Moreover, the presence of MXene nanosheets strongly inhibits the propagation of bacteria (e.g. E. coli and S. aureus ) in the filters. Such filters can significantly improve air quality, especially in public places such as hospitals.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Fan Liu,Wenbo Li,Junjie Yang,Dongxiao Ji,Yuan Liang,Hengtao Liang,Xiang Li,Pengju Han,Zupei Yuan,Jianxin He,Weili Shao
Highly efficient and reusable protective materials for chemical warfare agents (CWAs) are in high demand. Here, we used a surface modification technique to develop a material that provides chemical protection. Using an electrospun polyacrylonitrile (PAN) nanofiber membrane as the substrate, we modified the surface of the nanofiber with dopamine hydrochloride, which self-polymerized to form a polydopamine (PDA) surface layer, onto which we loaded metal–organic framework (MOF-808) particles. The presence of PDA on the surface of the PAN nanofibers significantly increased the breaking strength (2-fold increase) and elongation (9-fold increase) of the nanofiber membrane. Moreover, the PDA functionalities formed coordination sites to trigger the in situ growth of MOF-808 particles on the surface of the nanofiber membrane, thereby considerably increasing the growth rate and loading capacity. The surface of the nanofiber membrane was completely covered with MOF-808 particles following solvothermal treatment for 16 h. The MOF-808/PAN/PDA composite membrane could rapidly degrade 99.9% of dimethyl-4-nitrophenyl phosphate to p-nitrophenol within 8 min. After the membrane was used several times, the conversion rate stabilized at 95.9%, indicating that the MOF-808/PAN/PDA composite membrane has significant potential for application as protective clothing for CWAs.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Chenyang Xu,Li Zhong,Cui Liu,Nian Li,Shudong Zhang,Zhenyang Wang,Min Xi
The heat release of ambient temperature objects (0–100 °C) is often in the form of mid- to far-infrared radiation outward (∼4000 to 200 cm–1). In order to maintain warm objects, it is theoretically feasible to construct a kind of flexible material with infrared reflection ability targeting the band of mid- to far-infrared. In this paper, we proposed a type of nanofiber mat with excellent infrared reflection and thermal insulation performance. The ITO nanoclusters were introduced into the polyacrylonitrile (PAN) nanofibers via the electrospinning technique. The performed experimental test proved that the infrared reflection ability of the nanofiber mat can be enhanced because of the increased diameter of nanofiber upon the introduction of the ITO nanocluster as well as the localized surface plasmon resonance (LSPR) effects of ITO nanoclusters in the mid- to far-infrared range. It worth mentioning that the prepared nanofiber mat showed good air-permeability and mechanical properties due to the PAN matrix. Moreover, the performed experiments and numerical simulation analysis also suggested improved infrared reflection performance with respect to the size of aggregated ITO nanoclusters and their LSPR coupling effects in the nanofiber mat. The performed thermal insulation tests also indicated that the electrospun ITO/PAN nanofiber mat is promising for the thermal insulation of ambient temperature objects via IR radiation regulation.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
Polymers
·
2022
·Vol. 14
·期 13
·2523
·
IF 4.967
Hui Sun,Jiangli Feng,Yaoyao Song,Lei Xu,Xiaogang Cui,Bin Yu
The zeolitic imidazolate framework (ZIF−8)@polyacrylonitrile (PAN) nanofiber membrane was prepared and carbonized for heavy metal cadmium ion (Cd2+) adsorption in aqueous medium. Zinc oxide (ZnO) was first sputtered onto the surface of the PAN electrospun nanofiber membrane to provide a metal ion source. Then, the ZIF−8@PAN nanofiber membrane was prepared via in situ solvothermal reaction and carbonized in a tube furnace at 900 °C under a N2atmosphere to enhance adsorption performance. The synthesized ZIF−8 particles with polyhedral structure were uniformly immobilized on the surface of the PAN electrospun nanofiber membrane. After being heated at 900 °C, the polygonal ZIF−8 shrank, and the carbonized ZIF−8@PAN nanofiber membrane was obtained. Compared with the nanofiber membrane without being carbonized, the adsorption capacity of the carbonized ZIF−8@PAN nanofiber membrane reached 102 mg L−1, and its Cd2+adsorption efficiency could be more than 90% under the adsorption temperature of 35 °C and solution of pH = 7.5 conditions. According to the adsorption thermodynamics analysis, the Cd2+adsorption process of the carbonized ZIF−8@PAN nanofiber membrane was spontaneous. The whole Cd2+adsorption process was more suitably described by the pseudo second-order adsorption kinetics model, indicating that there exists a chemical adsorption mechanism besides physical adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Xuezhu Wang,Shunlong Pan,Ming Zhang,Junwen Qi,Xiuyun Sun,Cheng Gu,Lianjun Wang,Jiansheng Li
Fluoride contamination in groundwater is a worldwide problem that is related to human health. Zirconium-based adsorbents possess satisfactory selective defluoridation capacities. However, narrow efficiency pH range, easy aggregation and difficult separation are the main obstructions in practical application. In this study, the branched polyethyleneimine (bPEI) modified hydrous zirconium oxide (HZO)/polyacrylonitrile (PAN) nanofibers (NFs) are synthesized by immobilizing bPEI-HZO into PAN nanofibers via electrospinning. The resultant bPEI-HZO/PAN NFs exhibit a wide working pH range and an excellent adsorption capacity toward fluoride (67.51 mg·g −1 ) even at neutral condition, indicating non-negligible superiority in the practical application of groundwater defluoridation. This enhanced adsorption performance along with extended wider working pH range are ascribed to the optimization of the adsorbents from both composition and structure. Compositionally, the modification of bPEI improves the surface property of HZO, and thus increases fluoride capacity in alkaline groundwater. Structurally, electrospinning conquers the drawbacks of nano-adsorbents for both easy aggregation and difficult separation. In addition, the effect of co-existing ions was further investigated and the X-ray photoelectron spectroscopy (XPS) as well as fourier transform infrared spectrum (FTIR) measurements were used to clarify the fluoride adsorption mechanism. Furthermore, the dynamic adsorption and regeneration performance were accomplished through the fixed-bed column experiment. All the results indicated that bPEI-HZO/PAN NFs are promising materials for defluoridation from groundwater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 3
·45697
·
IF 1.86
Jing Ren,Chunqiu Yan,Qingwen Liu,Qingbiao Yang,Guanxiu Lu,Yan Song,Yaoxian Li
Amidoxime-modified polyacrylonitrile nanofibrous films (AOPAN NFs) were prepared via an electrospinning technique. The traditional preparation methods for amidoximated polyacrylonitrile (AOPAN) solution were changed and improved. First, the PAN solution was modified by hydroxylamine hydrochloride to produce an AOPAN solution, and then, a small amount of inhibitor was added to the AOPAN solution for electrospinning. We found that the crosslinking of the AOPAN solution was inhibited by the addition of a small amount of inhibitor; at the same time, the storage time of the AOPAN solution was prolonged. In addition, the prepared AOPAN solution was electrospun into nanofibrous films, which could be used as excellent adsorption materials for Cu(II), Pb(II), and methyl orange (MO) after drying. The maximal adsorption capacities for Cu(II), Pb(II), and MO were 143.47, 178.57, and 68.07 mg/g, respectively. The adsorption capacities of the nanofibrous films were more than 50% that of the first adsorption after four recycling runs; this indicated the reusability of the nanofibrous films for water treatment. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45697.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Rulu Huang,Huai Liu,Junhua Zhang,Yuan Cheng,Liang He,Lincai Peng
Design catalytic materials with high Lewis acid/base sites for catalytic transfer hydrogenation (CTH) of levulinic acid (LvA) to γ-valerolactone (GVL) is highly demanded but challenging. Herein, we report a concept of metal ion-polymer hybridization to design a tea polyphenol (TP) and HfCl 4 co-doped polyacrylonitrile (PAN) nanofiber (Hf@PAN-TP) via electrospinning technique . Comprehensive characterization revealed the well coordination between hafnium ions and phenolic hydroxyl groups of TP on PAN fiber, which promoted the formation of Lewis acid and Lewis base sites. As expected, a satisfactory GVL yield of 99.1% with 100% of LvA conversion was obtained using isopropanol as a hydrogen donor at 170 °C in 5 h, and the catalytic activity remained unchanged for five cycles. The kinetic study revealed the lower activation energy for CTH of LvA to GVL (33.5 kJ/mol), demonstrating the outstanding GVL formation rate of 3383.9 μmol/g . h. Based on the systematical combine of catalyst characterization and catalytic behavior, the structure-function relationship and reaction mechanism were proposed. More gratifyingly, Hf@PAN-TP was applicable for catalytic reduction of various carbonyl compounds, demonstrating a great potential for upgrading biomass-derived aldehydes/ketones.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Zenghui Mai,Senqing Fan,Yilin Wang,Jiaojiao Chen,Yu Chen,Ke Bai,Lei Deng,Zeyi Xiao
An Ag@PAN catalytic nanofiber composite membrane has been fabricated by combining electrospinning PAN nanofiber seeding with 2-MI and flowing synthesis. ZIF-8 can be immobilized on the surface of the nanofibers with Zn(NO 3 ) 2 solution flowing through the 2-MI/PAN nanofiber membrane and Ag nanoparticles can be immobilized on the nanofibers with Zn 2+ in ZIF-8 exchanged by Ag + followed with reduction reaction. The characteristics of XRD , XPS , FTIR, TGA, HRTEM , and BET proved the successful immobilization of Ag nanoparticles derived from ZIF-8 on PAN nanofiber. The permeance of the Ag@PAN catalytic nanofiber composite membrane can reach 19,227 L m −2 h −1 bar −1 with Ag nanoparticles immobilization amount of 49.64%. The p -NP conversion reaction is addressed for the catalytic performance of the Ag@PAN catalytic nanofiber composite membrane. The conversion rate of 99% can be achieved under the condition of p -NP concentration of 0.025 mM and membrane flux of 300 L m −2 h −1 . The apparent reaction rate constant of 236.63 min −1 can be achieved by flowing through mode, which is 4-5 orders of magnitude higher than that in a stirred tank reactor with Ag powders as the catalyst. The catalytic performance of the composite membranes has not declined significantly after ten cycles of the catalysis experiment, implied the good repeatability of the Ag@PAN catalytic nanofiber composite membranes.
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 POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-12
·
IF 2.426
Chen Yang,Jiang Lanying
In this research, an attempt has been made to prepare a membrane with high adsorption capacity and high separation efficiency for oil water. The composite membrane of UiO-66-NH 2 and polyacrylonitrile (PAN) were fabricated by electrospinning, and hydrophobic modification was carried out to obtain the oil selectivity. UiO-66-NH 2 loaded on fibers significantly enhanced the oil affinity and surface roughness of the composite membrane. The composite membrane was used for colleseed oil, kerosene, methylbenzene, methyl silicone oil and dichloromethane adsorption, and the maximum adsorption capacity were 31.5, 21.9, 19.9, 39.9, 39.7 g·g −1 , respectively, which was 32–96% higher than pure PAN adsorbent. The amount of UiO-66-NH 2 loaded on fibers accelerated the diffusion of oil in membrane and reduced the adsorption time to reach equilibrium. The adsorption process can be well described by pseudo-second-order and intra-particle diffusion model. The composite membrane also showed potential reusability. In addition, the composite membrane has excellent performance in oil/water separation, and the oil can be separated from mixture solution just under gravity. The oil flux is 2286 Lm −2 h −1 and remains 1568 Lm −2 h −1 after ten times continuous filtration. Overall, the composite PAN-MOFs-coated membrane has promising potential in practical application in oil/water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 299
·期 1
·25-35
·
IF 1.536
Zhang Zhijie,Chu Nini,Shen Yinglin,Li Congling,Liu Rui
In this study, hierarchical porous polyacrylonitrile nanofibers were fabricated via electrospinning zeolitic imidazolate framework-8 (ZIF-8) and polyacrylonitrile (PAN), followed by tannic acid (TA) etching and amidoximation (denoted as p-PAN-AO). The as-prepared p-PAN-AO was utilized to remove radioactive U(VI) from sewage water and simulated seawater. The influence of uranium adsorption on p-PAN-AO was investigated as a function of uranium concentration, pH, and time. Adsorption kinetic experiments indicated that the pseudo-second-order kinetic model was fitted better than the pseudo-first-order model. Benefiting from amidoximation and hierarchical porous structure, the nanoadsorbent exhibited a high U(VI) adsorption capacity of 412.28 mg/g at 298 K. The thermodynamic analysis manifested a spontaneous and endothermic nature of U(VI) adsorption. The results demonstrated a potential application of the reported materials in nuclear wastewater and environmental cleanup.
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
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·984-997
·
IF 4.204
Li Fengli,Chen Chuang,Wang Yuda,Li Wenpeng,Zhou Guoli,Zhang Haoqin,Zhang Jie,Wang Jingtao
Nanofibers with high specific surface area and chemical stability have broad prospects in the applications of adsorption. However, the adsorption capacity is limited by the scarcity of adsorption groups and storage space. Herein, the activated carbon-hybridized and amine-modified nanofibers are prepared by integrating activated carbon (AC) and polyacrylonitrile (PAN) via electrospinning method and the subsequent amination, which could provide additional storage space and adsorption groups for ultrahigh adsorption capability. Thus, the obtained aminerich porous PAN nanofibers (APAN/AC) readily realized the ultrahigh adsorption capacity for metal ions and dyes in wastewater. Specifically, the adsorption capacity of APAN/AC nanofibers were 284 mg·g −1 for Cr(VI) and 248 mg·g −1 for methyl orange, which were almost 2 and 4 times than that of amine-modified nanofibers (APAN) and carbon-hybridized nanofibers (PAN/AC), respectively. Moreover, the AC inhibited the chain mobility of polymer matrix and thereby endowing APAN/AC nanofibers with excellent recyclability. The adsorption capability retained 80% after nine adsorption-desorption cycles. The adsorption kinetics and corresponding mechanism were further explored. This strategy combines the advantages of polymer nanofibers and AC, opening a new avenue for developing next-generation absorbent materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）