COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Dongxue Han,Hongjie Zhao,Lili Gao,Zhihui Qin,Jinming Ma,Yong Han,Tifeng Jiao
In recent years, chitosan has been used as a common raw material to prepare hydrogels for wastewater treatment . In this work, a series of carboxymethyl chitosan/phytic acid (CMCS-PA) composite hydrogels with various amounts of PA were prepared to remove methyl orange (MO) and Congo red (CR) dyes from aqueous solution. The composite hydrogels with well-defined structure were characterized by different techniques. The experimental results revealed that the hydrogel possessed stable porous structure with more wrinkles on the surface due to the formation of intermolecular hydrogen bonding between CMCS and PA during the in-situ polymerization process. More importantly, the optimal adsorption conditions of CMCS-PA were obtained by changing different adsorption factors: ratio of two molecules and pH. And the CMCS-PA (3:1) composite hydrogel presented great adsorption capacity for MO (13.62 mg/g) and CR (8.49 mg/g) at pH = 7 at room temperature . In addition, the hydrogel also showed great adsorption reusability and stability. This work promotes further development in composite hydrogels design and their applications of wastewater treatment.
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高影响因子
Polymers
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2021
·Vol. 13
·期 13
·2084
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IF 4.329
Mingkun Li,Heping Li,Hongli Liu,Zhiming Zou,Chaoyu Xie
The development of natural biomass materials with excellent properties is an attractive way to improve the application range of natural polysaccharides. Bagasse Xylan (BX) is a natural polysaccharide with various biological activities, such as antitumor, antioxidant, etc. Its physic-chemical and biological properties can be improved by functionalization. For this purpose, a novel glycidyl metharcylate/phytic acid based on a BX composite derivative was synthesized by a free radical polymerization technique with glycidyl metharcylate (GMA;GMABX) and further esterification with phytic acid (PA;GMABX-PA) in ionic liquid. The effects of the reaction conditions (i.e., temperature, time, initiator concentration, catalyst concentration, GMA concentration, PA concentration, mass of ionic liquid) on grafting rate(G), conversion rate(C) and degree of substitution(DS) are discussed. The structure of the composite material structure was confirmed by FTIR,1H NMR and XRD. SEM confirmed the particle morphology of the composite derivative. The thermal stability ofGMABX-PA was determined by TG-DTG. Molecular docking was further performed to study the combination mode of theGMABX-PA into the active site of two lung cancer proteins (5XNV, 2EB2) and a blood cancer protein (2M6N). In addition, tumor cell proliferation inhibition assays for BX,GMABX-PA were carried out using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetraz -olium bromide (MTT) method. The results showed that various reaction conditions exhibited favorable gradient curves, and that a maximum G of 56% for the graft copolymerization and a maximumDSof 0.267 can be achieved. The thermal stability was significantly improved, as demonstrated by the fact that there was still 60% residual at 800 °C. The molecular docking software generated satisfactory results with regard to the evaluated binding energy and combining sites. The inhibition ratio ofGMABX-PA on NCI-H460 (lung cancer cells) reached 29.68% ± 4.45%, which is five times higher than that of BX. Therefore, the material was shown to be a potential candidate for biomedical applications as well as for use as a heat resistant material.
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PubMed
高影响因子
Journal of Materials Chemistry A
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2021
·Vol. 9
·期 21
·12807-12817
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IF 12.732
Hao Zhang,Chaohai Wang,Wuxiang Zhang,Ming Zhang,Junwen Qi,Jieshu Qian,Xiuyun Sun,Brian Yuliarto,Jongbeom Na,Teahoon Park,Hassanien Gomaa Abdien Gomaa,Yusuf Valentino Kaneti,Jin Woo Yi,Yusuke Yamauchi,Jiansheng Li
Carbon-based electrodes play important roles in constructing efficient capacitive deionization (CDI) devices. Therefore, the rational design of carbon materials with optimized structure, composition, and morphology is crucial for further improving the CDI performance. Herein, a novel N, P co-doped eave-like hierarchical porous carbon (NP-EHPC) for CDI is reported. To prepare the NP-EHPC, the core–shell ZIF-8@AF particles are first prepared through the kinetically-controlled growth of zeolitic imidazolate framework-8 (ZIF-8) and polymerization of p-aminophenol and formaldehyde (AF), followed by subsequent pyrolysis and post-doping with phosphorus. Owing to the unique eave-like morphology, presence of abundant mesopores, and co-doping of P and N, the NP-EHPC exhibits a high desalination capacity of 24.14 mg g−1 in 500 mg L−1 NaCl solution at 1.2 V and long cycling stability of over 150 cycles. Moreover, the density functional theory (DFT) calculation results reveal that the co-doping of N and P atoms can greatly enhance the binding energies for Na and Cl atoms and lead to superior electrosorption capacity. This work provides a new insight into the design of high-performance carbon materials for the desalination of brackish water.
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高影响因子
JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Ruixiang Wang,Yuanliang Yuan,Jianbo Zhang,Xiaocong Zhong,Jiaming Liu,Yongmin Xie,Shuiping Zhong,Zhifeng Xu
Transition metal phosphide/carbon composites are promising electrocatalysts for oxygen reduction reaction (ORR). Herein, we propose a facile process to fabricate a bayberry-like N, P-enriched carbon nanospheres embedded with Fe 2 P nanocrystals (Fe 2 P/NPCs). Bayberry-like polyaniline nanospheres (PANI-NS) are firstly synthesized through microemulsion template method . Then, Fe is incorporated in PANI-NS during the hydrothermal treatment . Lastly Fe x P nanocrystals and N, P-enriched carbonaceous carriers are obtained by pyrolyzing the hydrothermal-treated PANI-NS. The resultant Fe x P/NPCs exhibit a uniform particle size (~250 nm), a large specific surface area (523 m 2 g −1 ) and a homogeneous mesoporous structure (~3.46 nm). The phase structure of Fe x P depends on the Fe/P (molar ratio) during hydrothermal treatment. When Fe/P is around 0.2, a preferable Fe 2 P phase is obtained. The Fe 2 P/NPCs exhibit outstanding ORR electrocatalytic activity with a half-wave potential of 0.820 V (vs. RHE) and a diffusion-limited current density of 5.58 mA cm −2 , comparable with commercial Pt/C. Moreover, Fe 2 P/NPCs possess a good duration stability and higher methanol tolerance than commercial Pt/C. When assembled in zinc-air batteries, Fe 2 P/NPCs contribute to an open circuit voltage of 1.449 V, a maximum power density of 128.38 mW cm −2 , and a specific capacity of 691.0 mAh g −1 , superior to the commercial Pt/C-based zinc-air battery.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Xiaoming Fan,Yuyin Fan,Xiao Zhang,Lin Tang,Jinxue Guo
Heterostructured materials favoring synergism, efficient charge transfer, and abundant active sites have aroused enormous interests for water electrolysis. Here heterogeneous Co@CoO encapsulated in P, N co-doped carbon nanofibers supported on carbon cloth (Co@CoO-PNC/CC) has been prepared to pursue attractive synergism for the application of pH-tolerant catalyst for oxygen evolution reaction (OER) in both alkaline and neutral solutions. The prepared Co@CoO-PNC/CC exhibits advanced OER performances, generating a current density of 10 mA cm −2 at overpotential of 289 mV in alkaline media and 371 mV in neutral media. The high OER activity can be assigned to the synergistic effect of abundant active sites and enhanced charge transfer between Co and CoO, as well as the specific P, N co-doped carbon nanofiber architecture.
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高影响因子
FIBERS AND POLYMERS
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2021
·Vol. 22
·期 10
·2656-2663
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IF 2.153
Shi Huili,Zhao Wenjing,Zhao Xiaowei,Li Zhiwei,Li Xiaohong,Zhang Zhijun
A novel green composite flame retardant, bismuth oxychloride nanosheet decorated with chitosan and phytic acid (BiOCl@CS-PA) was prepared in order to improve the fire safety of flexible poly(vinyl chloride) (PVC). Introducing phytic acid (PA) is aimed at promoting the flame retardancy of BiOCl nanosheets in condensed phase using the synergistic effects. Chitosan (CS) not only acts as a bridge between BiOCl and PA, but also increases residue as a charring agent. Adequate characterizations verified that the BiOCl@CS-PA has been prepared successfully. When 3 wt.% of BiOCl@CS-PA was imparted into the PVC matrix, the resultant PVC composite can pass V-0 rating in the UL-94 test. Additionally, cone calorimetry test demonstrated that 3 wt.% of BiOCl@CS-PA reduced the first peak heat release rate and inhibited the pronounced peak heat release rate of PVC matrix between 300–400 s in comparison with the BiOCl nanosheets, indicating a further improvement in flame retardancy of PVC/BiOCl@CS-PA composite with the help of PA in the condensed phase. Microstructure and morphology of the char residue of PVC/BiOCl@CS-PA were analyzed to reveal the flame retardant mechanism. The results indicated that the joint action of PA and CS improves the quality of the char layer, which contributes to improving the flame retardancy in condensed-phase.
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高影响因子
Frontiers in Materials
·
2021
·
IF 3.515
Lin Peng,Xu Yuchen,Hou Junfeng,Zhang Xiaochun,Ma Lingfei,Che Wenbo,Yu Youming
Bamboo is a rich natural resource in the Asia Pacific, and it is widely used in the construction and decoration industry. Meanwhile, bamboo is an extremely combustible natural polymer material. Herein, the bamboo slices were treated with melamine and phytic acid using layer-by-layer (LBL) assembly technology to improve their flame retardancy properties. The morphology and chemical composition of untreated and treated bamboo slices were measured by scanning electron microscopy equipped with energy dispersive X-ray analysis and Fourier transform infrared spectra. The results showed that two-dimensional melamine–phytate (MP) nanoflakes were successfully formed and deposited on the bamboo surface. The deposition of the MP coating caused the earlier degradation of the bamboo to form char, according to thermogravimetric analysis. The peak heat release rates of the treated bamboo slices were reduced by more than 28% compared to those of the untreated ones. The MP coating promoted the formation of thermally stable char, which was responsible for the significant improvement in flame retardancy. Besides, the char layer with excellent thermal resistance performed a vital role in suppressing flame spread.
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高影响因子
Surfaces and Interfaces
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2021
·
IF 4.837
Xiaoming Fan,Yinxue Ma,Akang Sun,Xiao Zhang,Lin Tang,Jinxue Guo
The rational design of heterogeneous catalyst can be favored by synergistic interface for promising water electrolysis performance. Herein, the heterogeneous catalyst of NiFe 2 O 4 /Fe 3 (PO 4 ) 2 -PNC is prepared from NiFe LDH deposited phytic acid incorporated polyaniline nanofibers (PA-PANI) in situ grown on carbon cloth. The hybrid NiFe 2 O 4 /Fe 3 (PO 4 ) 2 nanoparticles acquire modulated OER mechanism due to the promoted proton transfer of phosphate group. The nanoparticles decorated tightly on PNC nanofibers assure high exposure of active sites and fast charge exchange. With the aid of above benefits, the NiFe 2 O 4 /Fe 3 (PO 4 ) 2 -PNC@CC exhibits good OER activities in neutral and alkaline medias, with low overpotentials of 325 mV and 275 mV at current density of 10 mA cm −2 , respectively, showing great potential as pH-tolerant OER catalyst for water splitting.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2021
·
IF 4.759
Jing Liang,Ke Min,Piao Long,Xuqian Weng,Qun Huang,Bo Chen,Ming Ma
Ce-doped Fe 3 O 4 magnetic particles (Ce-Fe 3 O 4 MPs) were synthesized by co-precipitation method. The coordination and adsorption properties of Ce-Fe 3 O 4 MPs to different natural products were investigated. The results verified that the “catechol-like”,“maltol-like” and “acetylacetone-like” donor sets of flavonoids were the binding sites with Ce-Fe 3 O 4 MPs. The adsorption was conformed to be pseudo-second-order model and single-layer adsorption after being characterized by adsorption kinetics and adsorption thermodynamics. The adsorption and desorption conditions were optimized. It was found that different components adsorbed on the Ce-Fe 3 O 4 MPs surface can be selective desorbed in different solvents, which was helpful for the selective separation to adsorbed components. The Ce-Fe 3 O 4 MPs were successfully applied to selective adsorption of compounds containing “catechol-like”, “maltol-like” and “acetylacetone-like” donor sets in the crude extract of Scutellaria baicalensis Georgi and Rheum palmatum L . The results demonstrated that the magnetic solid phase extraction (MSPE) method based on Ce-Fe 3 O 4 MPs has the advantages of high structural selectivity, high efficiency and low consumption, and can be used for efficient separation of flavonoids with specific structures from natural products.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peng Mu,Liang Song,Le Geng,Jian Li
Solar steam generation has attracted much attention due to its efficient and ecofriendly characteristics for application in water desalination and wastewater treatment. Many strategies have been developed to prepare the photothermal conversion materials. However, it is a challenge for preparing the materials with high energy efficiency, long durability and excellent salt resistance under 1 kW·m −2 illumination by using low-cost materials and simple method. Here, we report an ATP (Attapulgite) based PArG aerogel with low thermal conductivity (0.167 W·m −1 ·K −1 ), high mechanical property and superhydrophilicity by using combination of physical/chemical crosslinking of the ATP, PVA, GO and PA and freeze-drying for the efficient solar steam generation. The as-prepared PArG-A30 aerogel shows aligned three-dimensional porous structure and possesses high evaporation performance both in salt solution and the simulated seawater. The evaporation rate is calculated to be 1.4914 kg·m −2 ·h −1 for pure water, 1.4382 kg·m −2 ·h −1 for 20% of NaCl solution and the corresponding energy conversion is found to be 89.5% and 86% under 1 kW·m −2 illumination. In addition, the as-prepared PArG-A30 aerogel shows excellent durability and salt resistance in 20% NaCl solution, indicating the excellent the desalination performance of the resultant PArG-A30 aerogels. This study may offer a new approach to scalable fabricate a novel solar steam generator for the efficient solar steam generation by using simple method and low-cost materials.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dajin Liu,Zhilong Han,Jingqi Ma,Lingfeng Gao,Jie Cai,Lina Zhang,Shijie Cheng,Jia Xie
SiO x anodes hold great promise for next-generation lithium-ion batteries (LIBs) due to the high capacity and enhanced cycling stability versus silicon. However, its long-term development is hampered by seeking a scalable and effective method to tackle the issues of low conductivity and large volume expansion. Herein, a novel anode material is constructed by wrapping SiO x into PVA derived carbon layer and N-doped carbon (NC) nanosheets derived from exfoliated chitin nanosheets. The SiO x nanoparticles tightly encapsulated by the chitin nanosheets and PVA are transformed to robust SiO x @NC composites after pyrolysis. The encapsulation of PVA derived carbon layer and the NC sheets enhances the conductivity, relieves the volume change, and contributes to forming a stable SEI film. As a result, the prepared SiO x @NC-2 anode delivers a stable cycling performance and competitive rate capability. After 300 cycles at 0.5 A g −1 , a relatively high capacity of 602 mA h g −1 is maintained. The cost-effective precursors and facile synthetic route can promote the application of the SiO x @NC composites as anode materials in energy storage, as well as facilitating the large-scale application of the biowaste derived chitin.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Guodong Zhang,Guangyue Shi,Wentao Yuan,Yao Liu
In this study, phytic acid (PA) surface treatment was used to prepare iron-based soft magnetic composites (SMCs). The composition and microstructure of the SMCs were analyzed to assess changes in the magnetic properties . As the treatment time increased, the insulating layer on the powder surface gradually thickened, changing the internal morphology and conductive path of the annular samples after compacting. The changes in the magnetic properties and core loss were attributed to the increased resistivity and enhancement of the magnetic dilution effect. The optimal soft magnetic performance ( μ m = 389, P t = 235.1 mW/g measured at 100 kHz and 50 mT) was obtained by adjusting the processing time. This reduces the loss by 52.96% compared to the untreated sample and improves the application potential of soft magnetic composites at medium and high frequencies.
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高影响因子
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