MACROMOLECULAR CHEMISTRY AND PHYSICS
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2021
·Vol. 222
·期 15
·2100103
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IF 2.527
Xiaofei Shen,Hailong Huang,Hao Qian,Longxiang Tang,Yan Zhang,Min Xu,Huiqing Wang,Zhongkai Wang
Chiral property of cellulose can be transferred to final materials, here artificial helical polymer, right-handed helical poly(phenyl isocyanide) (PPI) is grafted onto ethyl cellulose (EC) with expecting to enhance the chiral effect of PPI. EC-2,3-g-PPI n copolymers are prepared via “click” chemistry of copper-catalyzed alkyne-azide cycloaddition, and confirmed by high-resolution 1 H and 13 C NMR, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). The resulting EC-2,3-g-PPI n copolymer takes a right-handed helical structure with super circular dichroism intensity which is 302% higher than that of PPI, which indicates that EC backbone promotes the right-handed chirality of PPI n . Furthermore, EC-2,3-g-PPI n exhibits good chiral recognition ability of the D/L-Ala-DNSP fluorescent probe, and induces a uniquely visible blue shift for L-Ala-DNSP. Therefore, a novel facile strategy is provided to highly improve chiral property and chiral recognition ability of artificial helical polymers by grafting onto EC.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Jianlong Li,Lijuan Zhou,Yingkun Song,Xin Yu,Xiaolin Li,Yunxiao Liu,Zhanrui Zhang,Yuan Yuan,Shouke Yan,Jianming Zhang
Microspheres based on cellulose nanocrystal (CNC)/metal oxide hybrid materials have great application prospects in wastewater treatment due to simultaneously adsorption, degradation ability, easily separation and recycling properties. However, the relatively small porosity and specific surface area of the CNC-based microspheres limit their adsorption ability. Herein, we reported a facile strategy to prepare porous microsphere based on CNC/MnO 2 by freeze-drying the air-bubble templated emulsion, in which the sodium alginate (SA) was used as the crosslinked matrix. Thus-obtained CNC/MnO 2 /SA microspheres showed low density of 0.027 g/cm 3 and high porosity of 98.23%. Benefiting from the high porosity, synergetic effect of CNC electrostatic adsorption and oxidative degradation ability of MnO 2 , the decolorization ratio of methylene blue (800 mg/mL) could be up to 95.4% in 10 min, and the equilibrium decolorization could reach 114.5 mg/g. This study provides a green and facile strategy to design porous CNC-based material for dye wastewater treatment.
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EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Shuangping Xu,Wenqiang Ma,Hailiang Zhou,Yushu Zhang,Hongge Jia,Jingyu Xu,Pengfei Jiang,Xintian Wang,Wenwen Zhao
Hybrid membranes containing different loadings of butadiene-bridged polymethylsiloxane (BBPMS) in ethyl cellulose (EC) were prepared by an one-pot blending method from a non-isolated solution of polymethylhydrosiloxane (PMHS) reaction with butadiene, and a solution of EC in THF. The semi-crosslinked BBPMS and the BBPMS/EC hybrid membranes having good compatibility were characterized by Fourier transfer infrared (FTIR) and Scanning electron microscopy (SEM). The BBPMS/EC hybrid membranes exhibited good membrane forming ability, heat resistance and mechanical properties. It was worth mentioning that the BBPMS/EC blended membranes exhibit good selectivity for CO 2 /N 2 and O 2 /N 2 . Specifically, the blended membrane (BBPMS/EC-5:5) showed the highest ideal selectivities for CO 2 /N 2 and O 2 /N 2 were 25.5 (at a CO 2 permeability of 175 Barrer) and 4.85 (at a O 2 permeability of 33.2 Barrer), respectively. Compared to the pure EC membrane, the ideal CO 2 /N 4 selectivity and the ideal O 2 /N 2 selectivity of the blended membrane (BBPMS/EC-5:5) were increased by 41.8% and 53.0%, respectively. The modification strategy using semi-crosslinked polysiloxanes to enhance gas transfer of EC is promising for fabrication of high performance CO 2 and O 2 separation membranes.
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CELLULOSE
·
2021
·Vol. 28
·期 18
·11417-11427
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IF 5.044
Lu Jun,Wen Jiexiu,Yu Qihao,Cui Chaofan,Su Juanjuan,Han Jian
Oily wastewater has always been an environmental issue that we are concerned about and committed to managing. Although the superwetting membranes have been extensively studied and widely used in oil/water separation, the abundant discarded membranes are still headaches due to their non-degradable nature. In this work, all-around green material, as well as superhydrophilic polylactic acid (PLA) nonwoven membrane, is designed by coating cellulose nanospheres (CNCs) with the aid of polydopamine (PDA). Plenty of hydroxyl groups and hierarchical rough structure synergistically contribute to the superhydrophilicity and excellent oil/water separation performance of the resultant CNCs/PDA/PLA nonwoven membrane. Interestingly, the efficiency of oil/water separation can be maintained above 98% after 100 times of repeated use. With the outstanding durability and easy controllability, the CNCs/PDA/PLA nonwoven membrane may provide effective solutions to manage the oily wastewater and secondary pollution of the used membrane itself simultaneously. Graphic abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Kongyou Wu,Kungang Chai,Liqin Zhou,Zhiliang Duan,Haibo Wu,Zhenghui Huang,Dongli Li,Zhongwei Tan,Fang Shen,Zongwu Wei,Hongbing Ji
Herein, a TEMPO-oxidized cellulose-grafted-polystyrene hypercrosslinked polymer (TOC-PS-HCP) was synthesized facilely by TEMPO oxidation , grafting copolymerization and post crosslinking route. Based on the structural characterization, it was confirmed that TOC-PS-HCP mainly consisted of polystyrene chain on cellulose and rigid crosslinked bridge. Additionally, the as-prepared TOC-PS-HCP displayed appropriate hydrophobicity (water contact angle = 102.44°) and high specific surface area (S BET = 601.20 m 2 ·g ‐ −1 ), which could efficiently recover ethylbenzene and styrene from PO/SM wastewater. The adsorption experiment was conducted to study the recovery performance for ethylbenzene and styrene in the aqueous phase. The results showed that TOC-PS-HCP could recover ethylbenzene and styrene quickly by adsorption process, and maintain a stable recovery rate both in different aqueous conditions and recycle experiments. The adsorption experiment in the simulated wastewater solution showed that TOC-PS-HCP exhibited the greater affinity for ethylbenzene and styrene than other substrates. Furthermore, a possible mechanism for the efficient recovery of ethylbenzene and styrene was suggested on the basis of experimental and theoretical results, which may be associated with van der Waals force and π-π stacking.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 43
·24650-24660
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IF 12.732
Jiaming Sun,Bang An,Kun Zhang,Mingcong Xu,Zhenwei Wu,Chunhui Ma,Wei Li,Shouxin Liu
Despite the boom in atmospheric water harvesting (AWH) techniques used to deal with the challenge of clean water shortage, few studies focus on hygroscopic materials that can indicate a moisture change in real time. Here, a moisture-indicating hygroscopic aerogel working in a broad range of relative humidities (RHs) and with fast sorption kinetics is designed for solar driven sorption-based AWH by integrating ethanolamine-decorated CoCl2 (E-CoCl2), microfibrillated cellulose (MFC) and LiCl-decorated polypyrrole (Cl-ppy). The specimen can visually indicate the sorption process in real time while harvesting moisture, achieving a flexible response to changes in environmental humidity and solar radiation. Fabricating an open, unordered, interconnected skeleton in E-CoCl2 using MFC can effectively enhance its sorption kinetics and also prevent the leakage of liquefied salt solution. The specimen has water sorption capacities of 0.39–2.05 kg kg−1 under RH 25–85% within 3.5 h and can quickly desorb within 1.5 h under 1 sun. An AWH device can conduct 3 sorption/desorption cycles within 9 h during one day outdoors and produces 2.81 kgwater kgsorbent−1. This strategy is a promising approach to enable sustainable water delivery without geographical and hydrological limitations, especially for the landlocked communities and arid areas.
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CELLULOSE
·
2019
·Vol. 27
·期 2
·743-753
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IF 3.917
Chen Junyu,Mao Liucheng,Qi Hongxu,Xu Dazhuang,Huang Hongye,Liu Meiying,Wen Yuanqing,Deng Fengjie,Zhang Xiaoyong,Wei Yen
Abstract In recent years, cellulose nanocrystal (CNC) based materials have attracted great research attention for different applications owing to their unique properties and facile modification chemistry. In this work, CNC based thermo-responsive fluorescent composites were successfully prepared via the metal-free surface-initiated atom transfer radical polymerization (ATRP) of NIPAAm and a Schiff base containing dye (HDPAP). Results demonstrated CNC-poly (NIPAAm–HDPAP) composites display sensitive temperature-responsive coil-to-globule transition behavior at the temperature of lower critical solution temperature. The bright fluorescence offered by the Schiff base dye (HDPAP) was also confirmed by fluorescence spectra. Moreover, the preparation method of light meditated ATRP was proved to become the promising way in fabrication of multifunctional nanomaterials for its incomparable advantages, including low energy consumption, high efficiency, good monomer adaptation, free of transition metal ions. Graphic abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 32
·32859-32865
·
IF 2.914
Yu Xiuling,Huang Xuejiao,Bai Changzhuang,Xiong Xiaopeng
Grafting polyacrylamide (PAM) chains onto microparticles may combine the advantages of the flocculation property of the former and the fast sedimentation of the later to realize better flocculation performance. In this work, inexpensive microcrystalline cellulose (MCC) microparticles, and monomer of acrylamide (AM) were mixed, and then irradiated under microwave. The obtained material was characterized by Fourier transform infrared spectroscopy and X-ray diffraction, and the results demonstrated successful modification of MCC with AM on the particle surface. The modification procedure has been carefully investigated to obtain an optimum preparation condition. Kaolin suspension was selected as a model to evaluate the flocculation properties of the obtained AM-MCC. Our results indicate that the AM-MCC with the highest grafting ratio of 95.5% exhibits the best flocculation performance, which is even better than that of PAM, and the turbidity can be decreased to 1.4% of the naked kaolin suspension within 2.5 min. Therefore, this work provides a low cost strategy to prepare biodegradable AM-MCC, which may have promising potential application in the water treatment and other fields.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Zhao,Zihao Feng,Zhenhua Liang,Yanfeng Lv,Fukang Xiang,Chuanyin Xiong,Chao Duan,Lei Dai,Yonghao Ni
Vitrimer, the third category of polymer materials, combines the properties of traditional thermosets and thermoplastics and has gained much interest from industry since the first report in 2011. Currently, many researchers focus on the exploration of new chemistry for novel vitrimer synthesis but pay less attention to the fabrication of vitrimer composites based on known vitrimer systems. The latter can not only largely decrease the cost of vitrimers but also provide a facile way to increase the variety of vitrimer-based materials and extend the applications of vitrimers in different fields. In this study, we developed a new class of vitrimer composite using polycarbonate as a matrix and natural cellulose paper as the reinforcing framework for the first time. The resultant materials possess exceptional mechanical properties and great thermal/chemical stability, simultaneously exhibiting a series of smart properties, such as shape-memory, reshaping, self-healing, and reprocessing. Noteworthily, the two main components of the resultant materials, polycarbonate and natural cellulose, can be easily recycled under mild conditions; thus, these new vitrimer composites qualify as novel green and sustainable materials.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2019
·Vol. 216
·期 22
·1900379
·
IF 1.606
Liang Ma,Xuejuan Shi,Xiaoxiao Zhang,Shunjun Dong,Lili Li
Core–shell-structured cellulose acetate–polycaprolactone/chitosan (CA–PCL/CS) nanofibers with excellent removal performance of hexavalent chromium (Cr(VI)) are developed by coaxial electrospinning. The effect of core-to-shell ratio on adsorption capability is studied. The results show that all core–shell-structured fibers possess higher adsorption capability and good durability in acidic environment compared with the CS powder adsorbent. CA–PCL/CS fibers with core-to-shell ratio of 0.442 have a maximum adsorption capability of 126 mg g −1 at room temperature. The adsorption kinetics reveals that chemisorption serves as the rate-determining step by notable electron transfer, share, or exchange between adsorbents and adsorbates. The adsorption equilibrium data of the core–shell-structured CA–PCL/CS fiber adsorbents are all well described by the Freundlich isotherm model, indicating the multilayer adsorption process. Herein, it is highlighted that the core–shell-structured CA–PCL/CS nanofibers have a promising prospect in removing Cr(VI) ions from waste water.
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Journal of Cleaner Production
·
2019
·
IF 6.395
Yi Wan,Ze-Yu Liu,Peng Song,Xiao-Qi Zhang,Jiang-Chao Song,Yu-Jie Fu,Xiao-Hui Yao,Jun Wang,Tao Chen,Dong-Yang Zhang,Long Li,Can-Yang Shi
In this study, a three-dimensional porous cellulose-based microsphere material modified with ionic liquid functional groups was prepared. Seven kinds of cellulose microspheres with different ionic liquid groups were successfully produced and were used for the adsorption of Acid Orange 7 dye. Cellulose microsphere modified with 4-methylimidazole, named as CMs4, had the greatest adsorption capacity of 218.6 mg/g and the fastest adsorption rate. CMs4 reached an adsorption capacity of 100 mg/g after only 10 min. Compared with materials in other literatures, CMs4 had an excellent Acid Orange 7 dye adsorption rate. According to the zeta potential analysis, the surface potential of CMs4 depended on the pH. Exploiting this property, cationic and anionic dyes can be separated using CMs4 by changing the pH. Since cellulose materials are renewable and widely available, CMs4 is a promising environmentally friendly material for dye adsorption applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xinxin Yang,Zhaoshuang Li,He Liu,Lina Ma,Xujuan Huang,Zhaosheng Cai,Xu Xu,Shibin Shang,Zhanqian Song
N-vinylcaprolactam (NVCL) is a temperature-responsive monomer, which is widely used for preparing responsive hydrogels. However, poor water solubility of NVCL necessitates the use of emulsifiers for better dispersion. Hydrolyzed epoxy soybean oil-grafted hydroxyethyl cellulose (H-ESO-HEC) polymeric emulsifier has excellent emulsifying properties, and the carboxyl groups afford pH-responsiveness to the hydrogels. A novel temperature- and pH-responsive cellulose-based hydrogel was prepared by combining NVCL and H-ESO-HEC. The hydrogel morphology, thermal stability , and swelling capacity were characterized, and it was also used as a dual-responsive drug preservative carrier. Scanning electron microscopy and thermogravimetric analysis confirmed the porous structure and good thermal stability, respectively, of the hydrogel. The hydrogel displayed a temperature- and pH-dependent swelling behavior and improved swelling capacity. The swelling behavior agreed well with the Korsmeyer-Peppas model and Schott's second-order kinetic model. The dual-responsive hydrogel has significant potential in the drug delivery systems owing to its biocompatibility and temperature and pH sensitivity.
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