CARBOHYDRATE POLYMERS
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2021
·
IF 9.381
Huijuan Jing,Xin Huang,Xiaojing Du,Ling Mo,Chaoyang Ma,Hongxin Wang
In this work, a novel synthesis strategy of sodium alginate/carboxymethyl chitosan hydrogel beads promoted by hydrogen bond was described. The beads were prepared by dropping the blends of two polymers into the citric acid solution. Besides hydrogen bonding , electrostatic interactions were also involved in the formation of the hydrogel beads. The thermal stability experiments revealed that the more the content of carboxymethyl chitosan , the better the thermal stability of the beads. The beads exhibited excellent pH sensitivity, pH reversibility, and lactoferrin loading capacity. The swelling ratio of the bead and its protein releasing profile was pH-dependent, which could prevent premature protein release in the gastric environment. Also, the circular dichroism results demonstrated that lactoferrin could maintain its structure during the loading and releasing process. The obtained results revealed that the hydrogel beads prepared in this work could be used as a potential protein carrier for oral delivery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
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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JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Yong Hu,Guojing Mo,Ying Wang,Juan Guo,Chao Huang
The TPP-β-cyclodextrin/chitosan (TPP-β-CD/CS) nanoparticles loading with curcumin (Cur) and vitamin C (Vc) was prepared via controllable self-assembly. The cross-linking reaction between TPP-β-CD and CS, and co-encapsulation of Cur and Vc in TPP-β-CD/CS nanoparticles were confirmed by the fourier-transform infrared (FTIR), UV–Vis (UV), X-ray diffraction (XRD), atomic force microscope (AFM), and particle size analyzer. The results of stability and antioxidant activity indicated that co-encapsulation not only enhanced the chemical stability of Cur and Vc, but also improved antioxidant properties compared with the active ingredients used alone. Release kinetic fitted by Ritger–Peppas model revealed that the release of dual active ingredients were mainly dominated by Fickian diffusion in pH 1.2, while followed non-Fickian or anomalous diffusion in pH 7.4. Furthermore, the two-dimensional UV correlation spectroscopy (2D-UV-COS) confirmed that the release rate of Cur was faster than that of Vc during co-delivery, which helps to precisely elucidate the synergistic nutraceuticals effect of each active ingredient.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Lingyuan Chen,Jiali Tang,Xinyue Zhang,Shixing Wang,Zhaogang Ren
A novel benzothiazole modified chitosan ( BCS ) with excellent Au(III) adsorption performance and selectivity was prepared as adsorbents. The structure and morphology of the adsorbents were characterized by FTIR, SEM, XRD and XPS. The adsorption property of the adsorbents for Au(III) were investigated under different reaction time, initial concentration of Au(III), temperature, pH and coexisting ions. The maximum adsorption capacity of BCS for Au(III) was 1072.22 mg/g at 298 K and optimal pH = 4, which was better than that of other adsorbents reported in literature. The adsorption kinetics and isotherm models fit the pseudo-second-order and Langmuir equations. This shows that the adsorption process of Au(III) is a monolayer chemical adsorption. The adsorption process can proceed spontaneously and belong to the endothermic reaction according to the thermodynamic results. The excellent adsorption performance is mainly attributed to the ion exchange and chelation of the nitrogen, sulfur and oxygen groups on the adsorbent with gold ions. Significantly, BCS has excellent selectivity toward Au(III) and remarkable recycle performance. With the high adsorption capacity, excellent selectivity and outstanding reusability, the BCS adsorbent could be a promising candidate to adsorb Au(III) from wastewater.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xiaolin Zhao,Xuejun Wang,Tao Lou
The coexistence of anionic and cationic dyes in dye wastewater has highlighted a great necessity to develop amphoteric adsorbents for their simultaneous removal. Herein, an amphoteric composite sponge was successfully fabricated by combining chitosan with electrospun sodium alginate nanofiber using lyophilization in acetic acid/water/dioxane mixed solvents, which owned the abundant functional groups and superior microstructure of interconnected pores and nanoscale fibers, beneficial for the adsorption capacity improvement. The optimum adsorption capacities for Acid Blue-113 and Rhodamine B were 926.2 ± 25.7 mg/g and 695.4 ± 17.0 mg/g, respectively, much higher than that of the controlled sample prepared with chitosan and non-spinning sodium alginate in traditional acetic acid/water solvents. Meanwhile, the sponge provided with the superior adsorption performance under various pH environment and cyclic adsorption. Importantly, it had considerable simultaneous adsorption capacity for binary system containing anionic and cationic dyes. Overall, the chitosan/electrospun sodium alginate nanofiber composite sponge shows potential for complex wastewater treatment.
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ACS Sustainable Chemistry & Engineering
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2021
·
IF 8.198
Weixin Xiao,Ping Wang,Xiaorui Song,Bin Liao,Kaiqi Yan,Jing-Jie Zhang
Traditional isotropic thermal insulators have been unable to meet the increasing demand for thermal insulation and the requirement of sustainable development, hence exploring a novel and advanced thermal management material is urgent. Previous studies indicated that the anisotropic porous materials with hierarchically aligned porous structures could improve the thermal management capability; however, the relationship between thermal properties and structure is unclear. Herein, a lightweight, large-scale, elastic, and anisotropic chitosan aerogel with excellent thermal management capability was fabricated via unidirectional freeze casting and silylation modification. Theoretical calculation had been used to analyze the effect of microstructure on the mechanical and thermal properties, as well as the anisotropic heat-transfer behavior. The anisotropic chitosan aerogel exhibited a honeycomb-like porous and lamellar structure, resulting in an advanced thermal management capability with a lower radial thermal conductivity (30.4 mW m–1 K–1) and two times higher axial thermal conductivity (60.1 mW m–1 K–1). The calculated results demonstrated that the thermal management capability of anisotropic chitosan aerogel was better than that of the isotropic materials (thermal conductivities of 10 and 22 mW m–1 K–1). It is helpful for further design of biopolymer aerogels for thermal superinsulation applications.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yongjun Sun,Yuanyuan Yu,Xing Zheng,Aowen Chen,Huaili Zheng
In this study, three magnetic flocculants, namely, MC, MC-g-PAM, and MC-g-PAA, were prepared. The structure characteristics, flocculation performance, and floc characteristics of the three magnetic flocculants were systematically studied and compared. SEM, FT-IR, XPS, XRD, TG–DSC, and VSM characterization results show that MC, MC-g-PAM, and MC-g-PAA are successfully prepared and exhibit good magnetic induction. The removal rates of copper ions by MC, MC-g-PAM, and MC-g-PAA under the optimal coagulation conditions are 93.39 %, 88.64 %, and 61.41 %, respectively. Kinetic fitting shows that the flocculation reaction process of MC and MC-g-PAM conforms to pseudo first-order kinetics, while the flocculation reaction process of MC-g-PAA conforms to pseudo second-order kinetics. The flocs produced by MC-g-PAA have larger particle size and fractal dimension than those by MC and MC-g-PAM. At 80 mg/L dosage and pH 6, the floc size and floc fractal dimension obtained by MC-g-PAA reach the maximum values of 48.28 um and 1.468, respectively. Zeta potential studies show that the flocculation functions of the three flocculants are mainly adsorption bridging, adsorption electric neutralization, and chelating precipitation. Recycling experiments show that MC-g-PAA has good recyclability, and the recovery rate after the fifth use is 77.24 % with the Cu(II) removal rate of 67.53 %.
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POWDER TECHNOLOGY
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2021
·
IF 5.134
Hongyang Wang,Lizhangzheng Wang,Siyuan Yang,Cheng Liu,Yanling Xu
Depressant carboxymethyl chitosan (CMCS) was introduced to reverse flotation of quartz from hematite using collector DDA. Microflotation experiments presented that CMCS completely depressed the hematite flotation while it had little effect on quartz flotation. The mineral mixture flotation confirmed the reagent scheme of DDA/CMCS could achieve efficient separation of quartz from hematite. It was also found that CMCS has better selective depression ability than the widely-used starch . Zeta potential measurements illustrated that CMCS could prevent DDA adsorption onto the hematite surface, while it did not affect the interaction between DDA and quartz surface. X-ray photoelectron spectroscopy (XPS) indicated that CMCS interacted with the Fe(III) components of hematite by chemisorption , which was stronger than the bonding between starch and hematite. Molecular dynamics simulation (MDS) further revealed the twice interaction energy of CMCS with (001) hematite surface than that of starch. Hence, CMCS has the potential to replace starch in practice.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 12
·3261-3270
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IF 2.153
Liu Kainan,Cao Liqin
Nylon mesh has been applied in various fields because of its intrinsic mechanical and chemical stability. However, its application is limited by its surface property. In this work, nylon mesh was first designed to integrate with a zeolitic imidazolate framework-67 (ZIF-67) with a distinct hydrophobic property. Herein, the mechanically stable nylon mesh/carboxymethyl chitosan/ZIF-67 (NY/CMCS/ZIF-67) composite membranes were prepared via layer-by-layer self-assembly of CMCS surface functional groups to coordinate with cobalt ion and in situ growth of ZIF-67. The prepared NY/CMCS/ZIF-67 membranes were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. After modifications, the ZIF-67 content in the membranes reached 22 %. The water contact angle increased from 47.5 ° for nylon mesh to 128.8 ° for NY/CMCS/ZIF-67. The NY/CMCS/ZIF-67 composite membranes exhibited good oil-water emulsion separation property and oil absorption ability. After 15 oil absorption-drying cycle experiments, the oil absorption ability of the membrane was still greater than 95 %, and the oil absorption rate was 6.8 g/g. The modified nylon mesh could still be used for dye removal, the adsorption capacity of the membrane increased by 50 % compared with that of NY/CMCS, and the adsorption processes followed the pseudo-second-order model. Thus, this research provides new insights into the preparation of efficient modified nylon film with great application potential for filtration and separation in complex environments.
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Materials Express
·
2021
·Vol. 11
·期 4
·461-468
·
IF 0
Shen Xiaosheng,Liu Mingli,Kong Cong,Zhai Wenlei,Fodjo Essy Kouadio,Cai Youqiong
Tetrodotoxin (TTX) is one of the most toxic nonprotein marine neurotoxins without antidotes. Two enzyme-free electrochemical immunosensor for the detection of TTX are fabricated in this work. On this immunosensor, a competitive immunoassay is established. Chitosan and Nafion are used
to facilitate the TTX antigen modification, where TTX antigen is attached to gold nanoparticles (AuNPs) to perform good electrochemical measurement. The detection strategy involves an enzyme-free process when performing electrochemical immunoassay. The LOQ of 4 µg/kg for real samples
and the linear range from 2 to 1250 ng/mL for solution test are obtained. Recovery of >78% and relative standard deviation of <6.1% for the two immunosensors are further validated by spiking experiment. Test on pufferfish samples shows consistency with the results from the HPLC-MS method.
These electrochemical immunosensors have the merits of being portable, low cost, battery-powered and fast for practical application, which can be a promising alternative to ELISA for on-site detection.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Yumin Wu,Chenzhengzhe Yan,Yupin Wang,Chuanhui Gao,Yuetao Liu
Inspired by biomaterials with hard and soft structures, we reported a type of self-healed, recyclable and antimicrobial elastomers material (ECTS) which exhibited both strong mechanical strength and high toughness. ECTS was designed by furfuryl amine modified epoxy natural rubber (ENR-FA) and furaldehyde modified chitosan (CTS-FUR) through Diels-Alder (D-A) reaction. The dynamic loading capacity of the chitosan skeleton, the stress ductility of the matrix and the dynamic cross-linking between the hard and soft components gave the elastomer excellent mechanical strength, toughness and self-healing ability. The tensile strength and the elongation at break could reach up to 7.55 MPa and 487%, respectively. In addition, due to the reversibility of the covalent bond between chitosan framework and rubber matrix, the crosslinking network destroyed by external force could be reestablished under high temperature stimulation. The mechanical properties of the sample could be restored to more than 90% of the original sample, whether it was complete fracture, cyclic damage or recyclable. ECTS exhibited excellent antibacterial activity against both gram-positive bacteria ( Staphylococcus aureus ) and gram-negative bacteria ( Pseudomonas aeruginosa ), with antibacterial efficiency more than 99%. So, ECTS might has a promising application prospect in medical materials, intelligent devices, 4D-printing, etc.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 34
·2102599
·
IF 18.808
Kaikai Zheng,Yu Tong,Shihao Zhang,Ruiying He,Lan Xiao,Zoya Iqbal,Yuhong Zhang,Jie Gao,Lei Zhang,Libo Jiang,Yulin Li
Real-time monitoring of wound healing remains a major challenge in clinical tissue regeneration, calling the need for the development of biomaterial-guided on-site monitoring wound healing technology. In this study, multifunctional double colorimetry-integrated polyacrylamide-quaternary ammonium chitosan-carbon quantum dots (CQDs)-phenol red hydrogels are presented, aiming to simultaneously detect the wound pH level, reduce bacterial infection, and promote wound healing. The hybridization of CQDs and pH indicator (phenol red) with the hydrogels enables their high responsiveness, reversibility, and accurate indication of pH variability to reflect the dynamic wound status in the context of both ultraviolet and visible light. Furthermore, these visual images can be collected by smartphones and converted into on-site wound pH signals, allowing for a real-time evaluation of the wound dynamic conditions in a remote approach. Notably, the hydrogels exhibit excellent hemostatic and adhesive properties, maintain sufficient wound moisture, and promote wound healing via their high antibacterial activity (against Staphylococcus Aureus , and Escherichia Coli ) and skin repair function. Overall, the resulting hydrogels have high potential as a novel smart and flexible wound dressing platform for theranostic skin regeneration.
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