REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Fu Liu,Bi-rong Ma,Dong Zhou,Li-Jing Zhu,Yin-Yi Fu,Li-xin Xue
A novel positively charged loose nanofiltration (NF) membrane was fabricated feasibly by UV-induced photografting polymerization of diallyl dimethyl ammonium chloride (DADMAC) on Polysulfone ultrafiltration membrane. A possible reaction mechanism was proposed that a linear chain structure and/or pyrrole like five-membered nitrogen heterocycles structure on the side chain were grafted to form the active barrier layer. NF membrane demonstrated a looser average pore size of 8.6 nm and positive charges surface. Owing to the nanoscale ultrathin nanoscale barrier layer and the combination of Donnan exclusion and steric hindrance , NF membrane exhibited good hydrophilicity , a high pure flux of 60 L/m 2 h (0.5 MPa), a good salt rejection to Mg 2+ (90.8%), Al 3+ (94.0%), Ca 2+ (91.5%), and a high dye rejection to methylene blue (99.4%) and congo red (100.0%) respectively. The salts rejection of NF membrane to different salts followed the order of AlCl 3 > CaCl 2 > MgCl 2 > NaCl > LiCl > MgSO 4 > Na 2 SO 4. NF membrane showed certain fouling resistance to seawater and BSA solution. The grafting polymerization kinetics were comprehensively investigated including irradiation time, monomer concentration and irradiation intensity. X-ray Photoelectron Spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurement were employed to investigate membrane chemistry, morphologies, and hydrophilicity.
研究领域:
材料科学
·
环境工程
·
膜分离技术
·
高分子化学
·
水处理
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DOI
高影响因子
Science China-Technological Sciences
·
2023
·Vol. 67
·期 5
·1417-1430
·
IF 4.6
Muhammad Arif,Yang QingMin,Kanwal Aisha,Zhao Jian,Nawaz Mohsan,Ren Hao,Yang Peng
Rhenium separation from molybdenum in molybdenite minerals and waste leachate has become an emerging challenge. Addressing this challenge, we prepared a set of protein-based alkylamine/alkylammonium salts complexes as extradants for selective uptake of rhenium from molybdenum, where the protein component turned into the insoluble amyloid-like structure when its internal disulfide bonds were reduced, namely phase-transition process. Among them, the phase-transited lysozyme and methyletrioctyleammonium chloride complex (PTL-N263) exhibited the most efficient adsorption at the alkaline condition for the electrostatic interaction between negatively charged metal ions with positively charged center (R 4 N + ) in N263, where negatively charged protein residues hindered the ion exchange of Cl − in N263 for larger size Mo species (Mo 7 O 24 6− ) than smaller size Re species (ReO 4− ). The adsorption follows the Freundlich model and pseudo-second-order kinetics, which exhibits top-level adsorption performance with a maximum adsorption capacity of 124 mg/g and a separation factor ( β Re/Mo ) of 2.78 × 10 3 for Re. The adsorption capacity per unit area (57.2 mg/(g m 2 )) is 1.6–41 times higher than previously reported adsorbents, and the cost for adsorbing 1 g of Re (VII) is $1.07, indicating its industrial capability. This adsorption strategy can be applied to separating Re from Mo in binary solutions and industrial wastewater with other competing ions.
研究领域:
环境科学
·
材料科学
·
化学工程
·
无机化学
·
工业废水处理
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 6
·5842-5847
·
IF 2.986
Lirong Yang,Chunmei Wang,Zhigang Liu,Xiaoyu Liu,Yang Song,Xiaoxin Feng,Baoqiang Zhang
Anatase TiO 2 coatings prepared by solvothermal process in a neutral ethanol solution of isopropyl titanate at 160 °C have been grown on slag wool fibers (SWF) which were modified by hexadecyltrimethylammonium bromide (CTAB) in advance. X-ray diffraction patterns confirmed the coatings are of a nanocrystalline anatase structure, and scanning electron microscopy observations and energy-dispersive X-ray spectrum revealed a continuous coverage of TiO 2 formed on the fiber surfaces. The photocatalytic activity of the samples was tested by the photocatalytic degradation of methylene blue (MB) solution. The results show that CTAB modified slag wool fibers (CMSWF) are not a suitable adsorbent for MB due to their weaker negative surface charges. Anatase TiO 2 coated CMSWF display higher photocatalyst activity than anatase TiO 2 coated SWF without CTAB modification, and Anatase TiO 2 coated CMSWF are relatively stable under UV-light irradiation.
研究领域:
材料科学
·
环境功能材料
·
表面改性
·
光催化
·
纳米涂层
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Dangge Gao,Jiahao Zhang,Bin Lyu,Leihong Lyu,Jianzhong Ma,Lintao Yang
The composite after referred to as P(DMDAAC-AGE)/(Ce-ZnO) was prepared via free radical polymerization by polymer including quaternary ammonium salt and epoxy group which grafted onto the surface of Ce-ZnO. ZnO nanorods, Ce-ZnO nanorods, P(DMDAAC-AGE), P(DMDAAC-AGE)/ZnO composites, P(DMDAAC-AGE)/(Ce-ZnO) composites and commercial antimicrobials were respectively treated on the cotton fabrics and their biological properties were investigated. There is a synergistic effect between Ce-ZnO and N + from the polymer in the fabric treated with P(DMDAAC-AGE)/(Ce-ZnO) composite so that it had a better antibacterial activity than pure polymer and pure Ce-ZnO. The antimicrobial rate of fabric treated with P(DMDAAC-AGE)/(Ce-ZnO) composite could reach up to 96%. And in order to investigate the durable ability, the fabric was washed multiple times to simulate the daily use washing. The result showed that the fabric still gave a superior antibacterial performance after 11 cycles (the equivalent of 55 times house laundering). Simultaneously, the differences in the amount of P(DMDAAC-AGE)/(Ce-ZnO) composite deposited on the fibers after washing were also investigated.
研究领域:
材料科学
·
高分子化学
·
纳米复合材料
·
纺织功能材料
·
抗菌材料
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DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Qingming Kong,Xuejun Wang,Xiaolin Zhao,Tao Lou
To effectively and selectively remove the anionic dyes from the wastewater, millimeter-scale hollow spheres, made from cationic chitosan, dimethyl diallyl ammonium chloride and anionic carboxymethyl cellulose, were prepared by a simple one-pot process of physical stirring and chemical graft. By introducing the positively charged monomer of dimethyl diallyl ammonium chloride, the cationic hollow sphere showed excellent adsorption capacity towards the anionic dyes. Adsorption kinetics and isotherm data were fitted well with pseudo-second-order and Langmuir models, respectively. The selective removal ratio of anionic reactive black-5 was as high as 99.1% from the reactive black-5/yellow 7 GL mixed solution. The novel hollow sphere not only opens a new avenue for the preparation of large size hollow sphere, but also has broad applications for the selective pollutant removal.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Ziqiang Tong,Xiufeng Liu,Baoquan Zhang
A series of sphere-like polyelectrolyte complexes (PECs) and their homogeneous polyelectrolyte complex membranes (HPECMs) were synthesized by using sodium carboxymethyl cellulose (CMCNa) and poly(diallyldimethylammonium chloride) (PDDA). Different compositions or ionic complexation degrees (ICD) of PECs could be characterized by FT-IR spectra. The circular dichroism spectrum (CD) and field emission scanning electron microscopy (FESEM) were employed to examine the conformation and morphology of PECs, respectively. Zeta (ζ) potential was utilized to investigate the charge density of PEC particles while the surface hydrophilicity of HPECMs was studied by using contact angle (CA) meter. When subjected to ethanol dehydration, HPECMs revealed a satisfactory pervaporation performance and desired anti-trade-off phenomenon. For HPECM 0.31 and HPECM 0.57, the permeation fluxes were 2.25 kg m −2 h −1 and 2.93 kg m −2 h −1 , and the water content in permeate reached up to 99.35 wt% and 99.38 wt%, with respect to 10 wt% water in feed under 70 °C. All the results indicated that small-sized and sphere-like PECs were truly in favor of enhancing the pervaporation performance in ethanol dehydration.
研究领域:
高分子科学
·
膜分离技术
·
化学工程
·
材料科学
·
物理化学
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DOI
高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 4
·1177-1191
·
IF 2.2
Peng Hao,Song Xiaolan,Song Dan,Wang Yi,An Chongwei,Luo Chunwang
The nano-boron powder (n-B) exhibits remarkable efficacy as a combustion catalyst, making it a prime candidate for use in solid propellant metal burners. Nevertheless, throughout the storage phase, the surface of n-B powder is prone to oxidation and substantial agglomeration, resulting in challenges with ignition and incomplete energy dissipation when utilizing boron powder. The synthesis of nano-boron/nitrocellulose/ammonium dinitramide@fluorine rubber (n-B/NC/ADN@F 2602 ) is accomplished via the coaxial electrospinning technique, with n-B uniformly dispersed within the core–shell fiber. The n-B is evenly distributed within the core–shell fiber, and as a result of F 2602 encapsulation, the moisture absorption of n-B/NC/ADN@F 2602 has decreased from 191.6 to 10.1%. In the course of combustion, the fibrous composite of n-B/NC/ADN@F 2602 undergoes an escalation in the rates of energy output and energy release, owing to the constraints imposed by external F 2602 . The n-B/NC/ADN@F 2602 demonstrates a 1.3-fold rise in peak pressure and a 1.15-fold increase in maximum pressure rise rate compared to n-B/NC/ADN. Furthermore, the maximum flame temperature is elevated by 150.5 ℃, and the combustion heat is augmented by approximately 8.7%. The findings of the energy performance assessment reveal that the mean molecular weight (MC) of the combustion byproduct of n-B/NC/ADN@F 2602 stands at 27.6 g·mol −1 , markedly surpassing that of n-B/NC/ADN. The aforementioned findings exemplify that coaxial electrospinning is an exceedingly efficacious technique for enhancing nanostructures, thereby amplifying the reactivity of energetic particles and offering novel insights into their application in energetic materials.
研究领域:
材料科学
·
纳米技术
·
燃烧工程
·
高分子科学
·
含能材料
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DOI
高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 3
·1519-1532
·
IF 4.9
Zhu Yuan,Zhang Liyi,Qi Benkun,Luo Jianquan,Wan Yinhua
Acidified aqueous solutions of different quaternary ammonium salts were tested for pretreating corn stover compared to control solutions, including single acidic solution and acidified NaCl and NH 4 Cl solutions. The results revealed that quaternary ammonium salt solutions were more effective in delignification and cellulose saccharification than the control solutions. The chemical structure of these salts significantly influenced the pretreatment efficacy. Notably, benzyltrimethylammonium chloride (BTMAC), a cost-effective option, exhibited remarkable capabilities. It achieved approximately 90% xylan removal, 86% lignin removal, and a 48-h enzymatic glucose yield of up to 93%. The BTMAC solution proved to be recycled for at least four runs while maintaining satisfactory performance. This work contributes valuable insights into the promising potential of standalone QAS solutions, offering a viable and cost-effective option for biomass pretreatment.
研究领域:
生物化学
·
生物技术
·
化学工程
·
可再生能源
·
环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jianling Huang,ChengWei Liao,Hui Wang,YuJun Zhao,Liuzhang Ouyang,Jiangwen Liu,Min Zhu
Mg-based alloy anodes suffer from severe corrosion in conventional electrolytes (KOH solution) and this substantially obstructs the cycle life, which is a great challenge for using them in the Ni-MH battery. Herein, a high concentration tetramethylammonium hydroxide (TMAH) aqueous electrolyte with a special hydrate structure is explored and enables excellent cycle stability and high capacity for Mg-based alloy anodes. In this electrolyte, the Mg 0.4 Ti 0.1 Ni 0.5 alloy anode delivers a maximum discharge capacity of 466 mAh g −1 , and maintains 210 mAh g −1 after 100 cycles owing to the reduced corrosion rate , which are much better than that in 6 M KOH electrolyte, being 425 mAh g −1 and 69 mAh g −1 , respectively. Furthermore, by in-situ forming Cu coating on the Mg 0.4 Ti 0.1 Ni 0.5 electrode surface during charging process with the adding 0.01 M of Cu(OH) 2 in TMAH electrolyte, the corrosion of the electrode is further suppressed and the reversible capacity can reach 313 mAh g −1 after 100 cycles. The high conducting Cu coating can also increase the rate capability of the electrode by promoting the charge transfer. Thus, using TMAH electrolytes provides a new approach to promote the electrochemical performances of Ni-MH batteries with Mg-based alloy anodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
金属腐蚀与防护
·
功能材料
·
电池技术
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2011
·Vol. 22
·期 12
·2237-2243
·
IF 1.776
Chenhao Ke,Juan Li,Keyi Fang,Qiliang Zhu,Jin Zhu,Qing Yan
A hyperbranched polyamine was prepared using an A 2 + B 3 approach. It acted as a hyperbranched charring and foaming agent (HCFA) in combination with ammonium polyphosphate (APP) to form a new intumescent flame retardant (IFR) system for polyamide 6 (PA6). Effect of HCFA on flame retardant and thermal degradation properties of IFR-PA6 was investigated by limiting oxygen index (LOI), UL-94 vertical burning, cone calorimeter, and thermogravimetric analysis (TGA) tests. The IFR system presented the most effective flame retardancy in PA6 when the weight ratio of APP to HCFA was 2:1. The LOI value of IFR-PA6 could reach 36.5 with V-0 rating when the IFR loading was 30 wt%. Even if the loading decreased to 25 wt%, IFR-PA6 could still maintain V-0 rating with an LOI value of 31. TGA curves indicated that APP would interact with both PA6 and HCFA in PA6/APP/HCFA composite under heating. The interaction between APP and HCFA improved the char formation ability of IFR system and then much more char was formed for PA6/APP/HCFA composite than for PA6/APP. Therefore, better flame retardancy was achieved. Moreover, the structure and morphology of char residue were studied by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The results indicated that compact and foaming char layer containing P-O-C structure was formed for PA6/APP/HCFA system during combustion. Copyright © 2010 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
材料科学
·
阻燃材料
·
热稳定性
·
聚合物复合材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 36
·16907-16918
·
IF 6.97
Hong Lin,Jian Mao,Minchao Qin,Zhilong Song,Wanjian Yin,Xinhui Lu,Wallace C. H. Choy
While red is one of the primary colors for display applications, the investigation of visible red emitting perovskites, particularly 2D perovskites, is relatively limited. In this work, we demonstrate a single-phase Ruddlesden–Popper quasi-2D (C3H7NH3)2CsPb2I7 perovskite for red color LEDs. Through increasing the annealing temperature of (C3H7NH3)2CsPb2I7 perovskite thin films, we have successfully achieved tunable emission wavelengths from 654 to 691 nm. Equally important, for all the quasi-2D perovskite LEDs, once the annealing temperature is fixed, the emission spectrum is independent of bias voltages, which is very important for their use in lighting and displays. With the analysis of the crystallinity, morphology, and thermodynamic stability of the quasi-2D perovskite, we find that the obtained (C3H7NH3)2CsPb2I7 perovskite is a single-phase quasi-2D perovskite with only n = 2 phase. Besides, we found that the red shifting of emission wavelength is caused by the increase of perovskite crystal size while increasing the annealing temperature. Our results also show that the temperature-induced color tunability can be applied to a series of quasi-2D perovskites with different alkylammonium cations. Importantly, we find that short alkylammonium spacers offer better electrical properties for efficient current transport and high performance in LED applications. This work contributes to controlling the optoelectronic properties of quasi-2D perovskites via controlling their crystal growth as well as paves the way to realize practical lighting and display applications of perovskite LEDs.
研究领域:
材料科学
·
光电功能材料
·
半导体器件
·
纳米结构材料
·
固态照明
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DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2017
·
IF 0
Zhiquan Chen,Mengwei Jiang,Qingwu Zhang,Yuan Yu,Guangping Sun,Juncheng Jiang
A series of flame-retardant unsaturated polyester resin (UPR) were prepared by the addition of dimethyl methylphosphonate (DMMP) with various amounts of aluminum hydroxide (ATH) or ammonium polyphosphate (APP) as the flame retardants. The combustion resistance effects of ATH/DMMP and APP/DMMP systems were evaluated by limiting oxygen index test and vertical burning test (UL-94). The thermal properties of UPR were investigated by thermogravimetric analysis. The structure of char was observed by scanning electron microscopy. DMMP incorporated with ATH or APP improved the flame retardancy and thermal properties of UPR. However, the fire-retardant mechanism of these two systems were different: The ATH/DMMP system provided synergistic effect in charring property of the UPR, produced great amount of residual char, and thus revealed the excellent flame retardancy. The APP/DMMP system further improved the flame retardancy of the UPR due to the change in the residual char structure rather than the increase in the production of char.
研究领域:
高分子科学
·
材料工程
·
消防安全工程
·
化学工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）