Journal of Food Measurement and Characterization
·
2024
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IF 2.9
Liu Jianying,Ma Yan,Ukwatta Ruchika Hansanie,Xue Feng,Xiong Xiaohui,Li Chen
The conjugates of gluten and polyphenols (naringin, hesperetin or curcumin) were produced by alkaline method and the effects of conjugation on physicochemical properties of gluten were investigated in this study. The results show that the conjugates possess lower content of free amino and sulfhydryl groups, and higher molecular mass, which indicate the covalent binding occurred. As compared with corresponding mixtures, the conjugates show lower intensity of the amide A, surface hydrophobicity, intermolecular β-sheets, interfacial and surface tension, as well as higher fluorescence intensity, antiparallel β-sheets and particle size (in the range of 130–150 μm). Furthermore, the conjugates also exhibit better emulsifying and foaming properties, higher storage modulus and lower degradation temperature than native gluten. However, the changes in physicochemical properties of conjugates depend on the type of polyphenols and curcumin-gluten conjugates possess the improved emulsifying, foaming and gelation properties among conjugates, due to their more flexible structure.
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hongyang Lian,Peisheng Li,Yantao Xu,Xiaochun Zhang
Bamboo is a sustainable, functional and rapidly growing natural material with excellent potential in sustainable building and industrial applications. However, as a structural material, bamboo is hindered by its low mechanical strength and poor mildew resistance. In this study, a simple and sustainable process was developed to partially remove lignin and hemicellulose from bamboo through alkaline pretreatment , combined with thermal mechanical compaction, to convert natural bamboo into a lightweight, high-strength, mildew resistant, and durable multifunctional structural material. The results showed that the comprehensive control effectiveness of the alkaline dense bamboo against Aspergillus niger , Penicillium citricola and Trichoderma viridis was 96.2%, the anti-mildew performance was significantly improved. Compared with natural bamboo, the flexural, tensile, and compressive strength of alkaline dense bamboo increased by 6.9 times, 2.5 times, and 4.6 times, respectively, reaching 578 MPa, 410 MPa, and 145 MPa. Compared with some synthetic structural materials with excellent mechanical properties, the alkaline dense bamboo also exhibited superior specific tensile strength and Shore hardness . The multifunctional alkaline dense bamboo prepared in this study provides the possibility for bamboo resources to be widely used in the field of structural engineering.
研究领域:
材料科学
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林业工程
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可持续发展
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DOI
高影响因子
Surfaces and Interfaces
·
2024
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IF 5.7
Xingyu Wu,Yaoqi Lei,Yanzong Zhang,Zhenxing Zeng,Lulu Long,Xiaojing Wang,Yan He,Gang Yang,Fei Shen,Yan Liu
Excessive discharge of wastewater containing phosphorus is the leading cause of water eutrophication. In this study, yttrium ions were embedded in chitosan/polyvinyl alcohol hydrogel beads by adsorption of amino functional groups. After alkali treatment, a new chitosan-based yttrium hydrogel adsorbent (PC-Y-OH) with porous channels was perpetrated. The results showed that alkali treatment reduced the protonation of amino functional groups in hydrogel and made PC-Y-OH have stable adsorption of phosphate in the initial solution of pH 4∼10. Compared with hydrogel beads without alkali treatment (PC-Y 3+ ), the inhibition of high concentration bicarbonate and sulfate of PC-Y-OH was reduced by 47 % and 43 %, respectively, under acidic conditions (initial pH of 3). In weak acid (initial pH of 6) or alkaline (initial pH of 8) conditions, its adsorption capacity is almost uninhibited by co-existing substances. After regenerating the adsorbent with an alkali solution 7 times, the adsorption capacity was still over 80 % of the first adsorption. The adsorption kinetics and thermodynamics results indicated that PC-Y-OH could reach the adsorption equilibrium within 2 h, and the adsorption process was a spontaneous exothermic process with a maximum adsorption capacity of 62.36 mg-P/g. Surface chemical analysis of the adsorbent indicated that phosphate adsorption on the adsorbent was primarily driven by chemical complexation. Moreover, this provides a promising adsorbent for recovering phosphorus from aquatic environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 42
·10966-10972
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IF 5.236
Lanqing Li,Wei Gao,Min Lei,Dan Wen
Graphical A simple ex situ wet chemical transformation method of alkali treatment was proposed to prepare Ni(OH) 2 nanostructured flowers with large specific surface areas from Ni-MOF-74. The relationship between concentration of alkali and the structure properties of corresponding Ni(OH) 2 was uncovered. As the results, the catalyst of Ni(OH) 2 -0.25 performed remarkably catalytic properties with lower potential, higher current density and excellent durability towards MOR among various samples. Post treatment of metal-organic frameworks (MOFs) is widely employed to develop efficient electrocatalysts with better catalytic properties. But the complex processes of post treatment generally led to the collapse of the original structures of MOFs, making the preservation of their pristine hierarchical porous structure a great challenge. Herein, we propose the strategy of alkali treatment of Ni-MOF to transform it into Ni(OH) 2 with similar morphology and enhanced electrocatalytic properties for methanol oxidation reaction (MOR). The structure and electrocatalytic properties of as-obtained Ni(OH) 2 nanostructured flowers were seriously depended on the alkali concentrations. As the result, Ni(OH) 2 obtained from Ni-MOF treated by 0.25 M NaOH (noted as Ni(OH) 2 -0.25) performs 1.5 and 2.5 times larger current density than those of Ni(OH) 2 -0.025 and Ni(OH) 2 -0.5 for MOR. Moreover, the electrocatalytic process and mechanism of MOR on the catalyst of Ni(OH) 2 -0.25 are also revealed. Hence, this ex situ conversion strategy of alkali treatment for Ni-MOF uncovered the transformation of MOFs in alkaline solution and develops robust electrocatalyst for practical application of methanol fuel cells.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Zheng Wei,Zhang Peigen,Tian Wubian,Qin Xia,Zhang Yamei,Sun ZhengMing
To modify the adsorption performance of Ti 3 C 2 T x MXene , we report a facile approach to expand the interlayer spacing of Ti 3 C 2 T x and to tune its surface functional groups by hot alkaline solution treatment. In the treatment, the interlayer spacing of Ti 3 C 2 T x MXene is increased by up to 29% by LiOH, and the surface functional groups are tuned by converting -F to -OH. Among the MXenes, LiOH-Ti 3 C 2 T x and NaOH-Ti 3 C 2 T x can faster adsorb methylene blue (MB) than other MXene adsorbents; NaOH-Ti 3 C 2 T x possesses the highest adsorption capacity (189 mg/g) for MB, which can be ascribed to the cooperation of surface adsorption and intercalation adsorption. The experimental data suggest that the enhanced adsorption toward cationic dyes can be best described by a Langmuir isotherm.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Jing Li,Zhaomeng Liu,Chengqi Feng,Xiaoying Liu,Fangyu Qin,Chen Liang,Huiyang Bian,Chengrong Qin,Shuangquan Yao
The premise of high value utilization of lignocellulosic biomass is effective separation of hemicellulose. In this paper, the extraction of bamboo hemicellulose using freeze-thaw assisted alkali treatment (FAT) was studied. The effect of alkali concentration, alkali treatment time, freezing temperature, and freeze-thaw time on the main components was studied. Bamboo was frozen at −30 °C for 12 h, thawed at room temperature, and then treated at 75 °C for 90 min with 7.0% alkali. The extraction rate of hemicellulose was as high as 64.71%. The purity of hemicellulose samples using conventional AT decreased from 82.63% to 78.56%. Hemicellulose with the same yield as that of conventional alkali treatment was obtained by further reducing the alkali concentration. The purity of hemicellulose samples increased from 82.63% to 89.45%. It had a higher purity, higher molecular weight, and lower polydispersity. A new, green and efficient alkaline extraction method for hemicellulose was developed.
研究领域:
生物化学
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材料科学
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DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xudong Zhu,Yingying Xue,Liang Qian,Changtong Mei,Ying Gao
Urea-formaldehyde and phenolic resins are often used in the preparation of bamboo- or wood-based materials. However, adhesives containing these resins can release harmful substances such as formaldehyde and phenols, posing risks to human health. Meanwhile, delignification is widely used for modifying bamboo- and wood-based materials, but it has some limitations such as high steaming temperatures and long processing time. In this study, a simple and effective self-bonding method for fabricating bamboo-based materials was developed. This method integrated partial delignification and bonding, and its main mechanism involved applying sodium hydroxide (NaOH) solution to the bonding surface of bamboo, followed by hot pressing. This process softened lignin under alkaline conditions, promoting interactions between cellulose chains and the softened lignin to form a strong network at the bonding interface. Laminated bamboo fabricated by treating bamboo with a 9 % NaOH solution followed by hot pressing at 140℃ for 60 min under 2 MPa pressure exhibited excellent bonding performance, demonstrating a 6.84 MPa bonding strength. This self-bonding method facilitates the development of adhesive-free bamboo- and wood-based products, reducing dependence on synthetic adhesives.
研究领域:
材料科学
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木材加工
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环境科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 3
·546
·
IF 4.324
Danqi Li,Hongchen Song,Xia Meng,Tingting Shen,Jing Sun,Wenjia Han,Xikui Wang
Particle size of nanomaterials has significant impact on their photocatalyst properties. In this paper, TiO2nanoparticles with different crystalline sizes were prepared by adjusting the alkali-hydrothermal time (0–48 h). An annealing in N2atmosphere after hydrothermal treatment caused TiO2reduction and created defects, resulting in the visible light photocatalytic activity. The evolution of physicochemical properties along with the increase of hydrothermal time at a low alkali concentration has been revealed. Compared with other TiO2samples, TiO2-24 showed higher photocatalytic activity toward degrading Rhodamine B and Sulfadiazine under visible light. The radical trapping and ESR experiments revealed that O2•-is the main reactive specie in TiO2-24. Large specific surface areas and rapid transfer of photogenerated electrons are responsible for enhancing photocatalytic activity. The above findings clearly demonstrate that particle size and surface oxygen defects can be regulated by alkali-hydrothermal method. This research will deepen the understanding of particle size on the nanomaterials performance and provide new ideas for designing efficient photocatalysts.Keywords:TiO2;alkali;particle size;surface oxygen defects;photocatalysis
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Cheng Wang,Shaozheng Leng,Huidong Guo,Liyun Cao,Jianfeng Huang
Hydrophilicity/hydrophobicity property of zeolite has been received much attention in recent years. Regulation of hydrophilicity/hydrophobicity of zeolite using relative simply process and cheap raw materials is needed to be further investigated and solved. The aim of this study is to investigate effect of acid and alkali treatments on structure, hydrophilicity/hydrophobicity of natural zeolite. The structure of the samples was characterized using ICP , XRF , XRD , laser particle size analyzer, N 2 adsorption-desorption, XPS, SEM-EDX, etc. The hydrophilicity/hydrophobicity of the samples was determined using water vapor adsorption method coupled with BET specific surface area results. The results showed that acid treatment removed 5.05–23.26 wt% of aluminum from the framework of clinoptilonite using 0.1–3 M nitric acid while alkali treatment removed 0.49–7.64 wt% of silicon from the framework of clinoptilonite using 0.05–0.8 M sodium hydroxide. Accompanied by the removal of Al and Si, the specific surface area of zeolite obviously increased and decreased, respectively. Water vapor adsorptions on the alkali and acid treated zeolites with ascending SiO 2 /Al 2 O 3 ratio gradually decreased which confirmed the increase of hydrophobicity and decease of hydrophilicity for the samples. This acid/alkali treatment method appears to be a simple and effective way to regulate hydrophilicity/hydrophobicity of natural zeolite.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Cuiting Ding,Miaomiao Zhang,Bohui Lyu,Zheyuan Guo,Na Xing,Xiao Pang,Tao Wu,Yurong Jiang,Runnan Zhang,Ayman El-Gendi,Hong Wu,Zhongyi Jiang
Loose nanofiltration membranes (LNF) with efficient sieving and excellent permeance are desirable for dye/salt separation, and engineering the micropore of the LNF membranes is a promising approach to maximize membrane performance . Herein, we present a highly permeable and sieving polyamide LNF membrane with high porosity and suitable pore size that is prepared by interfacial polymerization using twisted aqueous phase monomer and subsequent alkali-treatment. The large-size, rigid and twisted structure of the adamantane-1,3-diamine effectively inhibits the dense-packing of polymer chain segments, resulting in a polyamide membrane with enhanced porosity and enlarged pore size. The alkali treatment hydrolyzes the partial amide linkage to further enlarge the membrane pore size, increasing the flux while maintaining high dye rejection. The optimum membrane exhibits a high salt/dye selective factor of 735 for Na 2 SO 4 /Evans blue and an excellent water permeance of 87.72 L m −2 h −1 bar −1 . This study is expected to provide a valuable guidance for the targeted design and fabrication of LNF membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 3
·925
·
IF 3.748
Weihua Chen,Jiancheng Tang,Peidong Cheng,Yunlong Ai,Yi Xu,Nan Ye
2D layered MXene (Ti3C2Tx) with high conductivity and pseudo-capacitance properties presents great application potential with regard to electrode materials for supercapacitors. However, the self-restacking and agglomeration phenomenon between Ti3C2Txlayers retards ion transfer and limits electrochemical performance improvement. In this study, a 3D porous structure of Ti3C2Txwas obtained by adding alkali to a Ti3C2Txcolloid, which was followed by flocculation. Alkaline-induced flocculation is simple and effective, can be completed within minutes, and provides 3D porous networks. As 3D porous network structures present larger surface areas and more active sites, ions transfer accelerates, which is crucial with regard to the improvement of the superior capacitance and rate performance of electrodes. The sample processed with KOH (K-a-Ti3C2Tx) exhibited a high capacity of approximately 300.2 F g−1at the current density of 1 A g−1. The capacitance of the samples treated with NaOH and LiOH is low. In addition, annealing is essential to further improve the capacitive performance of Ti3C2Tx. After annealing at 400 °C for 2 h in a vacuum tube furnace, the sample treated with KOH (K-A-Ti3C2Tx) exhibited an excellent specific capacitance of approximately 400.7 F g−1at a current density of 1 A g−1, which is considerably higher than that of pristine Ti3C2Tx(228.2 F g−1). Furthermore, after 5000 charge–discharge cycles, the capacitance retention rate reached 89%. This result can be attributed to annealing, which can further remove unfavourable surface groups, such as –F or –Cl, and then improve conductivity capacitance and rate performance. This study can provide an effective approach to the preparation of high-performance supercapacitor electrode materials.Keywords:Ti3C2Tx;alkaline treatment;annealing treatment;3D porous structure;supercapacitors
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Hankun Tan,Li Sun,Feng Xie,Jingjing Hu,Yaru Qu,Yihe Zhang
An alkali-treated MXene-SnS hybrid was prepared through hydrothermal methods. The Alk-MXene microplates provide highway for electronic transport, and the 3D wrinkled morphology ensures sufficient channels for Li + diffusion. The alkali treatment of MXene gives Alk-MXene@SnS enhanced binding strength, which allows the SnS nanosheets to remain firm binding with the Alk-MXene substrate during cycling and overcome capacity decay caused by large volume change. The synergy between the two components guarantees the hybrid excellent electrochemical properties by enabling high electronic/ionic conductivity and superior kinetic properties as evidenced by EIS, GITT tests and DFT calculation. As a result, the Alk-MXene@SnS retains specific capacities of 519 mAh/g after 100 cycles at 200 mA g −1 , and 330 mAh/g at the high rate of 8000 mA g −1 . In addition, a reversible capacity of 421 mAh/g can be provided after long term cycle test at 1000 mA g −1 for 800 cycles.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）