JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Yu Shujuan,Hou Ruiliang,Sun Jiaxiang,Deng Cailong,Tan Dengfeng,Shi Hongqi
Preparing a biomass adsorbent material with high-absorption performance but low cost plays a vital role in wastewater treatment. In this study, a novel nitrogen-doped sisal fiber-based carbon dots (SF-N-CDs) composite was prepared by directly growing carbon dots (CDs) on sisal fiber (SF) using a microwave method with polyethyleneimine (PEI) as a raw material. The prepared SF-N-CDs were characterized using FTIR, XRD, Contact angle(CA), TGA, XPS, and SEM. The results revealed that the CDs were successfully grown on SF. The adsorption properties of SF-N-CDs were significantly enhanced when they adsorbed methyl blue (MeB) dye. Specifically, the adsorption of MeB by SF-N-CDs was up to 619.7 mg/g, which was about 2.6 times higher than that of raw SF. This implied that the introduction of CDs increases the adsorption site, thus enhancing the adsorption capacity. Analysis on kinetics and thermodynamics of MeB adsorption by SF-N-CDs revealed that the adsorption process followed the Langmuir isotherm model and were consistent with both kinetic models. It signifies that the adsorption involves both physical and chemical adsorption processes. Further, the SF-N-CDs maintained a removal rate of 70.9% after six adsorption-regeneration cycles, demonstrating good regeneration performance. Moreover, the SF-N-CDs could selectively separate MeB from a mixture of rhodamine B and saffron T. Consequently, the findings of this study suggest that SF-N-CDs are promising adsorbents for anionic dyes.
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 Cleaner Production
·
2018
·
IF 5.651
Hao Wang,Zheng Liu,Qiuqun Liang,Hanyang Zhong,Guo-Cheng Han,Shufen Zhang,Zhencheng Chen
Sisal is a perennial tropical biomass with largest dosage in industry. Due to the special hard structure of sisal fiber , it can be prepared as carbon material and applied for negative material of lead-carbon battery . The pretreatment of sisal fiber was carried out by 5% NaOH and 5% H 3 PO 4 and tested by the measurement of FTIR, thermogravimetric analysis and SEM. Carbazole was doped in pretreated sisal fiber to prepare carbon material by a simple approach with two-step method. The characterization of the synthesis doped-N carbon material was tested by Raman, BET, XRD and EDS. According to the result of BET, it was turned out that the doped-N carbon material had a larger specific surface area. And the electrochemical properties were measured by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Besides, the cycling life test and charge/discharge curve were performed on battery testing instrument. In addition, the lead-carbon battery contained doped-N carbon material had a longer discharge plateau and a higher ultimate capacity. It was concluded that doped-N carbon material had a better electrochemical performance compared to undoped-N carbon material.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 1
·213-222
·
IF 5.044
Fan Fangwei,Zhu Mengting,Fang Kaiyang,Cao Endi,Yang Yinzhi,Xie Jinpeng,Deng Zhongmin,Chen Yiren,Cao Xinwang
Cellulose nanowhiskers as one kind of renewable and biocompatible nanomaterials evoke much interest because of its versatility in various applications. Herein, the sisal cellulose nanowhiskers with ultrathin diameter of 5–10 nm, high crystallinity of 74% and C6 carboxylate groups converted from C6 primary hydroxyls were prepared via a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)/NaBr/NaClO system selective oxidization combined with mechanical homogenization. The effects of sodium hydroxide concentration in alkali pretreatment on the final sisal cellulose nanowhiskers were explored. It was found that with the increase of sodium hydroxide concentration, the sisal fiber crystalline type would change from cellulose I to cellulose II. The versatile sisal cellulose nanowhiskers would be particularly useful for applications in the nanocomposites as reinforcing phase, as well as in tissue engineering, filtration, pharmaceutical and optical industries as additives.
研究领域:
材料科学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
Advances in Materials Science and Engineering
·
2015
·
IF 0.744
Chun Wei,Sihua Zeng,Yuyuan Tan,Wu Wang,Jian Lv,Hongxia Liu
The renewable cationic polyelectrolyte chitosan (CH) and anionic nanomontmorillonite (MMT) layers were alternately deposited on the surface of sisal fiber cellulose microcrystals (SFCM) via layer-by-layer (LBL) self-assembly method. The structure and properties of the composites were characterized by zeta potential, thermal gravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectrometer (FTIR), microcalorimeter (MCC), and so forth. The zeta potential results show that the cellulose microcrystalline surface charge reversed due to the adsorption of CH and MMT nanoplatelets during multilayer deposition. MMT characteristic diffraction peaks appear in XRD patterns of SFCM(CH/MMT)5 and SFCM(CH/MMT)10 composites. Additionally, FESEM reveals that the SFCM(CH/MMT)10 surface is covered with a layer of material containing Si, which has been verified by elemental analysis. TGA results show that the initial decomposition (weight loss of 5%) temperature of SFCM(CH/MMT)5 is increased by 4°C compared to that of pure SFCM. On the other hand, carbon residue percentage of SFCM(CH/MMT)10 is 25.1%, higher than that of pure SFCM (5.4%) by 19.7%. Eventually, it is testified by MCC measurement that CH/MMT coating can significantly reinforce the flame retardant performance of SFCM.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·7130-7137
·
IF 3.201
Lulu Pan,Zhongqiang Xiong,Laifu Song,Jianfeng Ban,Shaorong Lu
In this paper, a thermo-responsive network shape-memory polymer (SMP) which has high elasticity, triple shape-memory properties and rapid shape recovery effects was reported. This new type of shape-memory polyurethane network (denoted SF-SMPs) was successfully synthesized by chemically cross-linking cellulose sisal fibre (SF) with polycaprolactone (PCL). The structures, morphology, and shape-memory properties of the SF-SMPs have been carefully investigated. The results demonstrate that the SF-SMPs form micro-phase separation structures consisting of a semi-crystalline PCL soft phase and an amorphous hard phase. Different contents of polyester sisal fibre (PSF) influence the crystallinity of the PCL soft phases. The cross-linking structures provided a stable network, high elasticity and good thermal stability to the SF-SMPs. Thus, all of the SF-SMPs exhibited triple shape-memory properties, and recover to the original shape immediately. Especially, the sample with the lowest content of PSF (P1) exhibited high (over 91%) shape fixity and 90% shape recovery. The first step of strain recovery is associated with the melting transition of soft segment crystals of the polyurethane matrix, and the second step of strain recovery results from the glass transition of the hard segment. This work demonstrates new cellulose cross-linking structures of SMPs, which will have many applications in future smart science.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2017
·
IF 1.083
Zihao Xu,Chun Wei,Yongyang Gong,Zirun Chen,Dejiang Yang,Heng Su,Tianxi Liu
A highly flexible and conductive nanohybrid film based on multi-walled carbon nanotube (MWNT) was prepared using synergistic dispersion effects of nanosisal cellulose and graphene oxide (GO). The dispersion effect of MWNT was characterized using illustrative diagrams of different dispersions after centrifuge, transmission electron microscope, and Zeta potential, respectively. The results showed that 80 wt% MWNT was efficiently dispersed and formed a stable nanodispersion solution using 10 wt% cellulose nanofiber (CNF) and 10 wt% GO as dispersants. The conductivity and tensile strength of the CNF/GO/MWNT nanocomposite film were up to 1818.19 S/m and 25 MPa, respectively.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Haorui Liu,Zihao Liang,Shuoyu Wang,Nianfang Ma,Shuixia Chen
A thermosensitive solid amine fiber SF-AM-co-NIPAM-HBP-NH 2 was synthesized by grafting temperature-sensitive monomer N-isopropyl acrylamide (NIPAM) as well as acrylamide (AM) onto the surface of substrate sisal fiber, and further aminating with hyperbranched amine. FTIR, 13 C NMR, SEM, EA and TGA were used to confirm the structure and chemical properties of the grafted fibers. Swelling ratio and CO 2 adsorption-desorption experiment were investigated to verify the thermo-sensitivity of the grafted fibers and their CO 2 adsorption-desorption behavior. Compared with conventional solid amine adsorbents regenerated around 140 °C, SF-AM-co-NIPAM-HBP-NH 2 (1:1) with NIPAM could be regenerated at a much lower temperature of 60 °C, while still maintain a high CO 2 adsorption capacity (2.61 mmol/g), comparable to that of SF-AM-HBP-NH 2 (2.73 mmol/g) before NIPAM introduction. Its excellent regeneration property and the effect of energy consumption reduction make it possible to be used for CO 2 adsorption in industrial process.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 11
·1306-1311
·
IF 1.757
Deming Zeng,Jian Lv,Huashan Liu,Rui Du,Hui Lv,Chun Wei
In this paper, the effects of preparation methods on mechanical and tribological properties of sisal fiber cellulose microcrystalline (SFCM)/unsaturated polyester (UP) composites were studied. Compared with the pure UP composites, the SFCM/UP composites prepared by in-situ polymerization had greatly improved the mechanical and tribological properties. The impact strength, flexural strength, and flexural modulus of SFCM/UP composites with 2 wt% SFCM were 6.8 KJ/M 2 , 105.53 MPa, and 14.29 GPa, increased by 74.81%, 33.38%, and 7.36% in comparison with pure UP composites, respectively. Meanwhile, the volume wear rate of SFCM/UP composites at 100, 150, and 200°C decreased 50.40%, 52.39%, and 50.06%, respectively. These results suggested that the properties of SFCM/UP composites prepared by in-situ polymerization were significantly improved, which may be attributed to the strong interface interactions between SFCM and UP matrix. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Tianyun Lu,Xiaokun Han,He Wang,Zuocai Zhang,Shaorong Lu
Flexible and environmentally friendly bio-based films have attracted significant attention as next-generation fire-responsive sensors. However, the low structural stability, durability, and flame retardancy of pure bio-based films limit their application in outdoor and extreme environments. Here, we report the design of a sustainable bio-based composite film assembled from carboxymethyl-modified sisal fibre microcrystals (C-MSF), carboxymethyl chitosan (CMC), graphene nanosheets (GNs), phytic acid (PA), and trivalent iron ions (Fe 3+ ). Cross-linking between Fe 3+ and the C-MSF/CMC matrix and the formation of PA–Fe 3+ complexes on the surface of the film imparted excellent mechanical properties, chemical stability, self-cleaning ability, and flame retardancy to the bio-film. Furthermore, the bio-film produced a reversible and sensitive response to temperature at 55.3–214.1 °C, and a fire alarm system made from the bio-film had a fire-response time of 4.6 s. In addition, the char layer of the bio-film retained a stable cyclic response to temperature, enabling it to serve as a fire resurgence sensor with a response time of 2.3 s and recovery time of 11.2 s. This work provides a simple pathway for the fabrication of self-cleaning, flame retardant, and water-resistant bio-films that can be assembled into fire alarm systems for the real-time monitoring of fire accidents and resurgence.
研究领域:
材料科学
·
环境科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Bo Lei,Yanhong Feng
Thermoplastic bio-based materials from lignocellulosic fibers are of great importance in a sustainable society. To enhance their preparation to an industrial scale, a facile strategy is proposed that combines continuous steam explosion (CSE) with periodate oxidation/borohydride reduction to modify sisal fibers . In the CSE pretreatment , the aldehyde content of oxidized products was increased by a maximum of ∼17%, and the yield of oxidized/reduced products was increased by a maximum of 25%. Furthermore, the tensile strength of hot-pressed sheets was increased to 42.2 MPa, representing a 175% improvement compared with sheets without CSE pretreatment, and a decreased glass transition temperature of ∼132 °C. Results indicated that CSE pretreatment was favorable for improving the modification efficiency and uniformity of sisal fibers, simultaneously achieving much better mechanical properties and thermoplasticity . Appropriate oxidation level of sisal fibers also achieved the better performances. The combined strategy was facile and scalable, and might significantly impact the widespread preparation and utilization of thermoplastic bio-based materials.
研究领域:
材料科学
·
生物质能
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）