INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Huimei Shan,Chunya Zeng,Chaoran Zhao,Hongbin Zhan
This study is the first to evaluate the effects of Iron oxides (FeO x ) species and their decoration on graphene oxide/chitosan (GO/CS) composites for Cr(VI) removal and the possibility of Fe secondary pollution. Results show that Fe(III) is a better decoration material than Fe(II) and decoration through immersion-evaporation shows a higher adsorption capacity of Cr(VI) ( Q e ) than co-precipitation. Fe 2 O 3 -GO/CS as the only eco-friendly composite for enhanced Cr(VI) removal is further used for batch adsorption experiments, characterization, kinetics, isotherms, and thermodynamic studies. It is found that Cr(VI) removal mainly includes electrostatic attraction between Cr(VI) oxyanions and surface -NH 3 + and -OH 2 + , and the adsorbed Cr(VI) partially reduces to Cr(III). Q e increases with the increasing initial Cr(VI) concentration, contact time, and temperature, while decreases with the increasing pH and mass and volume ratio (m/v). The coexisting ions (Cl − , NO 3 − , SO 4 2− , PO 4 3− , As, Fe, and Pb) can cause an obvious decrease of Q e . The removal efficiency ( R e ) and Q e are 94.3% and 83.8 mg/g, respectively under the optimal conditions. After five times of regeneration, R e is still as high as 84% and Q e drops about 2.6%. Cr(VI) adsorption is spontaneous and endothermic, which is best fitted with the Sips model, and the fitted maximum Q e is 131.33 mg/g.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Yanyang Liu,Liqing Li,Zheshan Duan,Qingliang You,Guiying Liao,Dongsheng Wang
In this work, a chitosan modified nitrogen-doped porous carbon composite (CS-NPC) with abundant micropore and mesopore was prepared by the hydrothermal carbonization combined with chemical activation, and used as an adsorbent for phenolic pollutants removal. The CS-NPC composite were characterized by the field emission scanning electron microscopy (FE-SEM), N 2 adsorption-desorption curves, X-ray photoelectron spectrum (XPS), X-ray diffraction (XRD) and Raman. It was found that the resulting carbon material owned large specific surface areas (2189.88 m 2 g −1 ) and total pore volume (1.123 cm 3 g −1 ), and its micropore and mesopore volume was 0.494 and 0.629 cm 3 g −1 , respectively. Batch adsorption experiments were carried out to study the impact of various factors like solution pH value, contact time and ionic intensity. The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. And at 298 K, the adsorption capability of the CS-NPC composite for phenol, BPA and 2,4-DCP was 254.45, 675.68 and 892.86 mg g −1 , respectively, which was much higher than that of previously reported carbon-based materials due to its own high specific surface areas, abundant functional groups ( NH 2 , −OH) and porous structure. The adsorbent still remained excellent regeneration after five cycles. And the CS-NPC composite can be regarded as a broad-spectrum adsorbent toward other organic pollutants including methyl orange, methylene blue and tetracycline. This study developed a novel, low-cost and green porous carbon composite which was combined with the advantage of both phenolic resin and CS, and the CS-NPC would be an outstanding adsorbent for the removal of various organic contaminants from wastewater.
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CARBOHYDRATE POLYMERS
·
2020
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IF 7.182
Zhiyong Huo,Hongjuan Wu,Qingyi Song,Zhaoxi Zhou,Tian Wang,Jixing Xie,Hongqiang Qu
Chitosan-modified zinc hydroxystannate (ZHS-CS) was synthesized using the cations of the biomaterial chitosan (CS) and ion replacement strategy. A ZHS-CS and reduced graphene oxide (rGO) hybrid flame retardant (ZHS-CS/rGO) was synthesized for use in flexible poly (vinyl chloride) (PVC). Scanning electron microscopy images indicated that ZHS-CS and rGO were evenly dispersed in ZHS-CS/rGO without agglomeration. Fourier transform infrared spectroscopy results showed that rGO was fully reduced. The flame-retardant and mechanical properties of PVC composites were investigated using the limiting oxygen index (LOI), a cone calorimeter, and mechanical equipment. By replacing one-fifth of the zinc ions in ZHS by chitosan cations to obtain Sn-4Zn-1CS/rGO, the ZHS-CS/rGO was found to improve PVC composite performance. The total heat release and total smoke release of PVC/Sn-4Zn-1CS/rGO were reduced by 24.2 and 40.0 %, respectively, from those of pure PVC.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Muhammad Usman,Adeel Ahmed,Bing Yu,Song Wang,Youqing Shen,Hailin Cong
Herein, a new adsorbent Nitrilotriacetic acid β-Cyclodextrin-Chitosan (NTA-β-CD-CS) was synthesized for the effective simultaneous removal of dyes and metals. In this process, the β-CD cavities captured Methylene blue (MB) by host/guest contacts, and the remaining functional groups were able to act as adsorption sites for metal ions and Methyl orange (MO). In the single process, the maximum adsorption capacities of NTA-β-CD-CS adsorbent toward the Hg (II) MB and MO were 178.3, 162.6, and 132.5 mg/g, respectively. Sips and Langmuir's model were appropriate to define the adsorption system and mechanism. Most prominently, the NTA-β-CD-CS adsorbent was highly effective in the simultaneous adsorption of metals and cationic dyes and remained consistent with the mono system. The adsorbent performance efficiency remained constant even after four cycles. Therefore, the advantages of non-toxic chemicals, excellent adsorption, and regeneration performance revealed that NTA-β-CD-CS possessed great potential to treat realistic and model wastewater from different industries.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Wenqiang Tan,Jingjing Zhang,Yingqi Mi,Fang Dong,Qing Li,Zhanyong Guo
As one of the most promising biopolymers for a variety of potential applications, chitosan has attracted much attention because of its unique biological, chemical, and physical properties. The functionalization of chitosan has been adopted to synthesize novel chitosan derivatives with improved water-solubility and excellent biological activities. In this paper, chitosan was functionalized with a triphenylphosphonium group by means of the copper (I) catalyzed azide-alkyne “click” reaction and has been investigated as potential polymer for agricultural antifungal biomaterial. The influence of chemical modification on the structural characteristics and water-solubility of chitosan was investigated by FTIR spectroscopy , 1 H NMR spectroscopy , elemental analysis, and UV–vis spectrum. Furthermore, the antifungal property of target chitosan derivative against four plant threatening fungal pathogens was evaluated and in vitro investigation demonstrated that triphenylphosphonium salt incorporated chitosan backbone had excellent antifungal property compared with chitosan and intermediate chitosan derivative. Notably, target chitosan derivative displayed relatively strongest antifungal effect with over 80% inhibitory index against Botrytis cinerea at 1.0 mg/mL. The results of a detailed antifungal study indicated that cationic chitosan derivative bearing 1,2,3-triazole and triphenylphosphonium moieties provided a promising platform for preparation of novel cationic antifungal biomaterials in the field of agriculture.
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Materials
·
2020
·Vol. 13
·期 19
·4407
·
IF 3.057
Zheqi Wang,Guohua Zhang,Yanhui Li
This thesis reports the preparation of chitosan/polyacrylamide/graphene oxide nanocomposites (CAGs) and a study of its adsorption properties of methylene blue (MB) solution. Initially, we synthesized CAGs by blending and freeze-drying methods. Then, we conducted a series experiments by removing MB from aqueous solution to test its adsorption properties and adsorption mechanism. We used UV-Vis spectrophotometry to determine the concentration of residual methylene blue accurately and efficiently, which has a specific absorption peak at 662 nm in the UV-Vis spectrum, in aqueous solution. When the graphene oxide content in the composite was 20 wt%, the adsorption capacity reached maximum values. The chemical properties and surface structure of the nanomaterials were analyzed using FT-IR, TGA, SEM, and BET. Also, we carried out experiments to measure the adsorption properties of the CAGs by varying several factors, such as initial concentration, adsorption time, and pH, etc. The outcomes revealed that the adsorption equilibrium was developed after 2800 min at 20 °C (room temperature) with an adsorbent dosage of 0.01 g mL−1. The ion adsorption equilibrium data were well-fitted by the Langmuir isotherm with a maximum monolayer capacity of 510.2 mg/g. Kinetic researches disclosed that the adsorption procedure was defined by a pseudo-second-order model. Thermodynamic researches revealed that the enthalpy change (ΔH0) as well as Gibbs free energy change (ΔG0) of the adsorption procedure was negative, indicating that the adsorption procedure was spontaneous and exothermic. After three cycles, the removal efficiency was still 90.18%. Therefore, in conclusion, we believe that the CAGs is a good adsorption material for organic dyes due to its good adsorption and recyclable properties.Keywords:graphene oxide;chitosan;synthetic material;adsorption;methylene blue
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RSC Advances
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2020
·Vol. 10
·期 39
·23410-23416
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IF 3.119
Yanyan Chen,Qi Hu,Qiang Wang,Minghui Yu,Xiaoyu Gong,Shenjie Li,Jin Xiao,Yingjie Guo,Guangyu Chen,Xinyu Lai
With the rapid development of commodity circulation, more attention has been paid to the anticounterfeiting technology of commodities, including stability, universality and ease of distinguishing. The authors report the use of gelatin–chitosan–glycerin/QD nanocomposite-functionalized glue for luminescent anti-counterfeiting labels. As the blend and plasticizer, the addition of chitosan and glycerin effectively improved the flexibility and formability of the gelatin–chitosan–glycerin/QD composite films, which show excellent mechanical properties, including high transparency, luminescence and flexibility, and they are easy to prepare on a large scale, providing certain reference values for new anticounterfeiting technology applying a variety of morphologies.
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ACS Applied Bio Materials
·
2020
·
IF 0
Ting Wu,Shaobin Yu,Dongzi Lin,Zhimin Wu,Jun Xu,Jinglin Zhang,Zefen Ding,Ying Miao,Tao Liu,Tao Chen,Xiang Cai
With double cross-linking of chitosan (CS) and sodium alginate (SALG), a colon-targeting CS/SALG hydrogel bead was prepared and used for the colon-targeted release of doxorubicin hydrochloride (DOX). The CS/SALG hydrogel bead showed the improved mechanical property to withstand the simulated colon intestinal fluid (SCF), small intestinal fluid (SIF), as well as gastric fluid (SGF). DOX was released slightly in SGF and SIF and rapidly in SCF, showing a controlled DOX release from the CS/SALG hydrogel bead under different physiological conditions. In vitro cytotoxicity and in vivo toxicity assays indicated that the DOX-loaded CS/SALG hydrogel bead displayed obvious inhibition to tumor cells. These results suggested that the CS/SALG hydrogel bead had the potential application as a colon-targeting oral formulation for DOX transport.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Renliang Lyu,Ting Xia,Cheng Liang,Cheng Zhang,Zeqin Li,Lichun Wang,Yi Wang,Ming Wu,Xiaogang Luo,Jiayu Ma,Cunwen Wang,Caili Xu
Three kinds of novel environmentally benign and high-efficiency crude oil demulsifiers were prepared using methoxy polyethylene glycol (MPEG) to modify alkylated carboxymethyl chitosan (ACMC). Structures of the demulsifiers were confirmed using FT-IR and 1 H NMR, and the relationship between surface tension and concentration was tested. Demulsification performance was investigated using the bottle test method with oil-in-water (O/W) emulsions that were prepared in lab conditions. The demulsification efficiency was as high as 79.1 %–84.9 %, and the possible mechanism of the demulsification process is discussed. Results show that MPEG-grafted ACMC (MPEG-ACMC) has a promising application as a demulsifier for dealing with emulsified O/W crude oil.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2020
·Vol. 108
·期 9
·1890-1898
·
IF 3.525
Lilong Gao,Hui Zhang,Bing Yu,Wenlong Li,Fei Gao,Ke Zhang,Hongbo Zhang,Youqing Shen,Hailin Cong
Skin lesions and injuries can increase the risk of pathogen infections. Developing efficacious wound dressings could effectively prevent bacterial infection and accelerate wound healing. Herein, we developed chitosan composite hydrogels cross-linked by multifunctional diazo resin (DR) as antibacterial dressings for improved wound healing. The composite hydrogels were in situ formed by electrostatic interactions, chelation interactions, and covalent bonds between carboxylated chitosan and DR under ultraviolet assisted without small photosensitizer. The resultant hydrogels (noted as DR-CCH) showed good stability at different DR concentrations in physiological buffers. The antibacterial assays showed the DR-CCH could inhibit and kill Escherichia coli and Staphylococcus aureus . What is more, our hydrogels could accelerate wound healing in vivo. The present study demonstrates this composite DR-CCH with trace zinc has potential for accelerated wound healing.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Wei Ding,Xiaoyan Pang,Zhiwen Ding,Daniel C.W. Tsang,Zhicheng Jiang,Bi Shi
Tanning leather using green biomass-derived polyaldehyde (BPA) is a promising approach to eliminate the widespread Cr pollution in leather industry, but unsatisfactory thermal stability and mechanical strength of the correlated resultant leather limited its industrial application. Herein, we report a green methodology to strengthen BPA tanned leather via introducing chitosan derivatives to crosslink with free aldehyde groups on dialdehyde carboxymethylcellulose (DCMC) tanned leather. H 2 O 2 was employed for purposely modifying chitosan to prepare low-molecular chitosan (LMC) with lower positive charge. The interactions between chitosan/LMC and DCMC were investigated to elucidate the strengthening mechanism. Owing to the weakened hydrogen bonding network and higher accessibility of amino groups on LMC, LMC could react much easier with aldehyde groups on DCMC. Moreover, LMC could efficiently penetrate into the internal fiber networks of leather for further interlocking, which enhanced the thermal stability and the lubricating degree of crust leather and, as a result, the tensile and tear strengths were significantly improved by 79.3% and 25.3%, respectively. Therefore, the use of LMC can promote the widespread application of BPA tanned leather, benefiting to the complete elimination of hazardous Cr pollution.
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Environmental Chemistry Letters
·
2020
·Vol. 18
·期 4
·1379-1388
·
IF 5.922
Zhang Hao,Yang Fan,Lu Chuan,Du Chang,Bai Ruixi,Zeng Xian,Zhao Zhigang,Cai Chunqing,Li Jianguo
Treatment and recycling of radioactive waste are major challenges for the nuclear energy sector. Pertechnetate anions, 99 TcO 4 − , occur in nuclear waste and are formed mainly during nuclear fission. 99 TcO 4 − is a very hazardous contaminant due to its long half-life and high solubility and mobility in water. The effective capture of 99 Tc contamination at legacy nuclear sites remains a serious and unsolved environmental issue. In this work, 99 TcO 4 − /ReO 4 − was adsorbed by compressible graphene–chitosan sponges with grafted tertiary amine groups. Moreover, the hydrophobic branched chains strongly reduced the interference of competitive anions during adsorption. Results show that 99 TcO 4 − /ReO 4 − can be effectively removed even under highly acidic conditions and in the presence of competing anions. More than 98% of 99 TcO 4 − /ReO 4 − was removed using simulated nuclear wastes.
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