Materials
·
2022
·Vol. 15
·期 14
·4909
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IF 3.748
Yunquan Liu,Huimei Shan,Chunya Zeng,Hongbin Zhan,Yanyue Pang
Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased withC0,t, andTbut decreased with increasing pH andm/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42−> PO42−> NO3−> Cl−and Ca2+> Mg2+> Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3,m/v= 1.0 g/L,T= 298.15 K, andC0= 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.Keywords:hydroxyl iron oxide;graphene oxide;chitosan;Cr(VI) adsorption
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 1
·155-165
·
IF 3.348
Chengjun Peng,Guichun Wang,Yuxiao Wang,Maomao Tang,Xiaodong Ma,Xiangwei Chang,Jian Guo,Shuangying Gui
Periodontitis is a chronic inflammatory disease of tooth support tissues leading to progressive destruction of periodontal soft tissues as well as alveolar bone, and can be treated with anti-inflammatory and bone-protective agents to prevent disease progression. Caffeic acid phenethyl ester (CAPE) is a natural polyphenolic compound with anti-inflammation, anti-oxidation and bone tissue repair efficacy. In this work, we synthesized a thermosensitive hydrogel matrix of acetylated carboxymethyl chitosan (A-CC), and firstly applied for periodontal local drug delivery. The biocompatible CAPE-loaded A-CC hydrogel (CAPE-A-CC) has the advantages of forming a drug depot in situ, sustained release and precisely improving the drug concentration in the lesion sites compared with traditional systemic administration. In addition, CAPE-A-CC could significantly inhibit the expression of inflammatory cytokines of TNF-α, IL-1β, IL-6, and IL-17 in macrophages, and increased the expression of alkaline phosphatase (ALP) in human periodontal ligament stem cells (hPDLSC) related to osteogenesis. This study develops a novel in situ thermosensitive hydrogel delivery system to improve the therapeutic potential of natural active ingredient for periodontitis therapy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Xin Wang,Xinyu Sun,Tong Bu,Ke Xu,Lihua Li,Mingyan Li,Ruixia Li,Li Wang
The elaborate design of an ingenious hydrogel-assisted photothermal therapy (PTT) platform is a promising strategy for treating bacterial wound infections. Herein, a new generation of germanene nanocrystals (Ge NCs) with excellent photothermal performance are prepared via an ice-bath sonication liquid-phase exfoliation technique. Whereafter, by crosslinking interaction between chitosan and zinc acetate, as well as self-assembly property between Ge NCs and chitosan, we successfully construct an innovative germanene-modified chitosan antimicrobial hydrogel (CS/Ge NCs 0.8 ) integrating capture and killing bacteria performances. When co-cultured with bacteria, CS/Ge NCs 0.8 hydrogel with the positive charge can adsorb and restrict bacteria in the range of PTT destruction. Once the near-infrared laser is introduced, CS/Ge NCs 0.8 hydrogel will effectively convert light energy into localized heat, further inducing bacterial death. By this entirely novel modality, CS/Ge NCs 0.8 hydrogel exhibits marvelous antibacterial property against E. coli and S. aureus in vitro. Furthermore, in vivo studies demonstrate that CS/Ge NCs 0.8 hydrogel possesses the ability to significantly rescue S. aureus -induced skin wound infections, suggesting CS/Ge NCs 0.8 hydrogel can be served as an antibacterial dressing. Strikingly, this is the first-ever report of CS/Ge NCs 0.8 hydrogel in the antibacterial field, which may spur a wave of developing Ge-based biomaterials to benefit biomedical applications.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
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IF 2.042
Yu Song,Qing Wang,Wenjuan Yang,Qilin Chen,Yafen Zhou,Limei Zhou
The chitosan-nickel oxide (CS-NiO) composite was synthesized and characterized by XRD, FT-IR, SEM, TEM, BET, and TG-DTG. The as-prepared composite was used as an adsorbent for the removal of Congo red (CR) dye from aqueous solution. Effects of various parameters such as solution pH, adsorbent dosage, initial dye concentration, contact time, and temperature on the adsorption of CR were investigated. The adsorption kinetics was found to conform to the pseudo-second-order kinetics model with good correlation. The adsorption of CR on the CS-NiO composite followed the Langmuir model and the maximum adsorption capacity at 25 °C determined from Langmuir model was 188.68 mg/g. The thermodynamic data revealed the spontaneous and endothermic nature of the adsorption process. The CS-NiO composite adsorbent can be separated from system effectively and easily, and maintained high adsorption efficiency even after five-time recycles. The aforementioned results demonstrated that the CS-NiO composite could be used as an efficient and low-cost natural adsorbent for the removal of CR from aqueous solution.
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CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Qingcong Wei,Yaxing Wang,Huan Wang,Li Qiao,Yuqin Jiang,Guanglei Ma,Weiwei Zhang,Zhiguo Hu
Designing adhesive hydrogel wound dressings with inherent antibacterial and antioxidant properties is desirable to treat cutaneous full-thickness injuries in clinical care. Herein, a series of photo-induced Schiff base crosslinking-based adhesive hydrogels with promising traits are designed and prepared through Diels-Alder (DA) reactions between functional groups-grafted carboxymethyl chitosan (CMCS) and a photo-responsive polyethylene glycol (PEG) crosslinker. The quaternary ammonium and phenol groups in modified CMCS endows hydrogels excellent antibacterial and antioxidant properties. Upon UV (365 nm) irradiation, the generated o -nitrosobenzaldehyde from the photo-isomerization of o -nitrobenzyl in PEG derivative can subsequently crosslink with amino groups on tissue interfaces via Schiff base, endowing the hydrogel with well adhesiveness. Additionally, the hydrogel exhibits good BSA adsorption capacity, cytocompatibility and hemostatic property. The in vivo full-thickness skin defect study on mice indicates that the multi-functional hydrogel with considerable collagen deposition and vascularization capacities can be an effective and promising adhesive dressing for improving wound healing.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Zhang Shujie,Zhang Yating,Fu Lisong,Jing Mengke
The application shell uses cellulose as a green and recyclable fiber material, which has great value in the field of water treatment environment. Varying factors, including pH value, dosage of CS, reaction time and original Cr(VI) ions and Cu(II) ions were studied to investigate the Cr(VI) and Cu(II) ions removal efficiency. The obtained shell trichlorocellulose has better permeability to copper ions, which is mainly due to the different oxide states of copper ions and chromium ions in a pH environment, which lead to different combinations. The price of shell cellulose neutralization is relatively low. Metal ions have better absorption properties. The kinetic and thermodynamic characteristics of the adsorption process of copper ions by chitosan yarns were discussed. The adsorption process of copper ions conformed to the quasi-second-order kinetic equation. It can be fitted by Langmuir isotherm. The adsorption of copper ions by the yarn is a spontaneous thermal reaction with both physical adsorption and chemical adsorption. Compared with chromium ions, chitosan fibers have better adsorption of copper ions, which is mainly because the amino groups in chitosan fibers can have good chelation with copper ions. SEM, FTIR, XRD were used to characterize the adsorption of copper ions by chitosan fibers, and the mechanism of the adsorption of metal ions by chitosan fibers was explored.
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Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Bianyang He,Yaoyao Zhang,Bojie Li,Yuhan Chen,Lei Zhu
Carboxymethyl chitosan (CMCS) aerogels were prepared through sol-gel combining with freeze drying technology . The effects of CMCS concentration on the gelation time, volume shrinkage, density, porosity, compressive strength and hygroscopicity were investigated. Meanwhile, the CMCS aerogel was characterized by Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Then the CMCS aerogel was hydrophobic, modified through cold plasma modification technology, and oil absorbency of hydrophobic modified CMCS (HMCMCS) aerogel was researched. The results showed that the CMCS aerogel had the lowest density of 0.022 g/cm 3 , the maximum porosity of 95.34%, the highest compressive strength reached 1.74 MPa and a three-dimensional (3D) network heterogeneous porous structures in the inner areas. After hydrophobic modification, the water contact angle of 2% for HMCMCS aerogel with 20 min under 60 W reached 117 °. Besides, the HMCMCS aerogel represented excellent oil adsorbing property and outstanding recyclability , for the oil adsorption rate was up to 31.6 g/g and stable in multiple cycles.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Hongyan Mu,Zhaoxia Song,Xin Wang,Deda Wang,Xiaoqing Zheng,Xiaodan Li
The formation of complex coacervation using chitosan and octenyl succinic anhydride modified starch (OSA starch) and microencapsulation of algae oil were investigated in this study. The zeta-potential, turbidity and coacervate yield were evaluated as a function of pH and the chitosan- OSA starch mass ratio. The highest coacervate yield was achieved at pH 6.0 with a chitosan to OSA starch ratio of 1:3 ( w/w ). Isothermal titration calorimetry (ITC) indicated favorable affinity (Ka = 1.51 × 10 5 M −1 ) between chitosan and OSA starch. The microcapsules yielded an encapsulation efficiency (EE) in the range of 42.8 ± 0.8%- 93.1 ± 1.2%, the loading capacity ranged between 30.4 ± 2.7% and 58.3 ± 1.3%. Fourier transform infrared spectroscopy (FT-IR) spectra and scanning electron microscopy (SEM) further confirmed the microencapsulation. In comparison with the bulk oil, the microencapsulated algae oil exhibited improved oxidative stability during storage.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting’an Zhang
This paper aims to synthesis a recyclable adsorbent from solid waste using a clean and environmentally friendly method to deal with Cr(VI) water pollution. Magnetic zeolite/chitosan composites (ZFA/MCS) were prepared by the neutralization method. The adsorption properties of ZFA/MCS, prepared by the neutralization method for Cr(VI) ions under different conditions especially cross-linking, were investigated in detail. The results showed that cross-linked ZFA/MCS generally showed higher adsorption capacity than uncross-linked ones. The uncross-linked ZFA/MCS and cross-linked ZFA/MCS showed a saturated adsorption capacity of 25.67 mg·g −1 and 28.47 mg·g −1 at pH = 3 and 30 °C, respectively. The experimental values were followed Langmuir adsorption equations and pseudo-second-order kinetic model, indicating that the adsorption was probably monolayer coverage and chemical adsorption, respectively. The effect of temperature proved that the adsorption was spontaneous and endothermic. Therefore, the adsorbent with excellent recyclability and adsorbability was successfully fabricated via a green synthetic strategy.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongjun Sun,Yuanyuan Yu,Shengbao Zhou,Kinjal J. Shah,Wenquan Sun,Jun Zhai,Huaili Zheng
In this study, an amphoteric magnetic chitosan (CS)-based flocculant MFe 3 O 4 @CS-g-PIA was prepared from CS, Fe 3 O 4 , and itaconic acid (IA), and its apparent morphology and characteristic structure were systematically studied. The flocculation performance and mechanism of the fabricated material were also investigated in different pollution systems, and the effects of total monomer concentration, m(CS):m(IA), IA pre-neutralization degree, reaction temperature, reaction time, and initiator concentration on the synthesis of MFe 3 O 4 @CS-g-PIA were studied. Characterization results showed that MFe 3 O 4 @CS-g-PIA forms a three-dimensional network with excellent magnetic induction. The optimal removal rates of Cu(II) and Disperse Blue 56 (DB56; 90.2% and 97.0%, respectively) were obtained under the conditions of 150 mg·L −1 MFe 3 O 4 @CS-g-PIA, pH 6.0, and 300 rpm stirring speed. MFe 3 O 4 @CS-g-PIA maintained removal rates of over 80.0% for Cu(II) and DB56 after five consecutive cycles of regeneration/flocculation and demonstrated excellent acid resistance stability. Changes in the particle size distribution, fractal dimensions, and zeta potentials of the flocs indicated that the relevant flocculation mechanism involves the synergistic functions of chelation, charge neutralization, and adsorption bridging. An artificial neural network model was finally established on the basis of the experimental flocculation data to predict the removal rates of Cu(II) (R = 0.97) and DB56 (R = 0.98) accurately.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Liqun Jiang,Mi Zhang,Yuting Bai,Feiyan Cui,Cong Zhang,Ziyao Wang,Sujia Si,Ling Yang,Yun Wang,Yudong Zhang,Lei Li,Shuo Liu,Xiangrong Wei,Yan Wang,Ya Xu,Jian Meng
The hypoxia in tumor microenvironment (TME) can upregulate the HIF-1α and PD-L1 expression and cause immunosuppression of tumor. In this study, a carboxymethyl chitosan-based pH/hypoxia-responsive and γ-Fe 2 O 3 /isosorbide dinitrate carrying micelle was designed, and it could catalyze endogenous H 2 O 2 to generate oxygen and relieve hypoxia in TME, so as to relieve the overexpression of HIF-1α and PD-L1 in tumor; meanwhile, it could react with H 2 O 2 to release ROS via Fenton reaction and induce cytotoxicity in tumor. Along with these multiple effects, this carboxymethyl chitosan-based micelles could provide a comprehensive strategy for tumor treatment.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-15
·
IF 4.38
Eltaweil Abdelazeem S.,El-Monaem Eman M. Abd,Mohy-Eldin Mohamed S.,Omer Ahmed M.
An efficient composite was constructed based on aminated chitosan (NH 2 Cs), attapulgite (ATP) clay and magnetic Fe 3 O 4 for adsorptive removal of Cr(VI) ions. The as-fabricated ATP@Fe 3 O 4 -NH 2 Cs composite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analyzer (TGA), Scanning Electron Microscope (SEM), Zeta potential (ZP), Vibrating Sample Magnetometer (VSM), Brunauer–Emmett–Teller method (BET) and X-ray photoelectron spectroscope (XPS). A significant improve in the adsorption profile was established at pH 2 in the order of ATP@Fe 3 O 4 -NH 2 Cs(1:3) > ATP@Fe 3 O 4 -NH 2 Cs(1:1) > ATP@Fe 3 O 4 -NH 2 Cs(3:1) > Fe 3 O 4 -NH 2 Cs > ATP. The maximum removal (%) of Cr(VI) exceeded 94% within a short equilibrium time of 60 min. The adsorption process obeyed the pseudo 2nd order and followed the Langmuir isotherm model with a maximum monolayer adsorption capacity of 294.12 mg/g. In addition, thermodynamics studies elucidated that the adsorption process was spontaneous, randomness and endothermic process. Interestingly, the developed adsorbent retained respectable adsorption properties with acceptable removal efficiency exceeded 58% after ten sequential cycles of reuse. Besides, the results hypothesize that the adsorption process occurs via electrostatic interactions, reduction of Cr(VI) to Cr(III) and ion-exchanging. These findings substantiate that the ATP@Fe 3 O 4 -NH 2 Cs composite could be effectively applied as a reusable adsorbent for removing of Cr(VI) ions from aqueous solutions.
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