CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Daoyu Zhu,Bin Lu,Qianhao Yang,Hongping Yu,Pei Liu,Junhui Yin,Yixuan Chen,Yigang Huang,Qinfei Ke,Changqing Zhang,Yaping Guo,Youshui Gao
With the progressive research of fabrication methodologies of biomaterials, hierarchically porous structures and bioactive compositions have been identified to promote bone repair and regeneration. In this study, we firstly fabricated lanthanum-doped bioglasses/chitosan (La-BGs/CS) composite scaffolds for novel bone tissue engineering materials. The La-BG microspheres in the scaffolds possessed hierarchically porous structures combining hollow cores and mesoporous shells. The effects of La-BGs/CS scaffolds on osteogenesis and angiogenesis were evaluated both in vitro and in vivo . The as-doped lanthanum oxide in the scaffolds remarkably promoted osteogenic differentiation of bone marrow-derived mesenchymal stem cells via activating ERK signaling pathway, and stimulated migration and tube formation of human umbilical vein endothelial cells. As compared with the BGs/CS scaffolds, the La dopants in the La-BGs/CS scaffolds contributed to higher expression levels of both osteogenic and angiogenic-related genes. Moreover, the mesopores and macropores within the La-BGs/CS scaffolds enhanced the osteoconductivity and stimulated bone regeneration in cranial defect model of rats. The La-BGs/CS scaffolds could also promote vascularization in vivo as demonstrated by Microfil perfusion, which further augmented osseous regeneration. Therefore, the La-BGs/CS scaffolds provide an admirable application and novel platform for bone tissue engineering.
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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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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Wei Zhou,Yunxia He,Fei Liu,Liangkun Liao,Xiaobing Huang,Ruyi Li,Ying Zou,Lei Zhou,Liqiang Zou,Yuhuan Liu,Roger Ruan,Jihua Li
This study aimed to develop an active edible film based on carboxymethyl chitosan (CMCS) and pullulan (Pul) incorporated with galangal essential oil (GEO) by the casting method. And their physical properties, structural and preservation effect on mangoes were characterized. The CMCS/Pul ratio was determined to be 2.5:2.5 after the optimization of physical properties, mechanical properties and barrier properties of the blend film. The results of FT-IR and XRD showed that hydroxyl groups of Pul interacted with the carboxyl groups of CMCS and the blend films had good compatibility. Good thermal stability of CMCS/Pul-GEO films was further proven by TGA curves. The CMCS/Pul-8 %GEO film showed effective preservations on mango fruits during 15 days of storage at 25 ± 1 °C, based on the characterization by fruits weight loss, firmness, titratable acidity, soluble solids. Consequently, CMCS/Pul-GEO blend films may be a promising eco-friendly packaging material for the industrial application of fruit preservation.
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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
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2020
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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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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 46
·20458-20469
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IF 3.288
Jiaqi Chen,Chunhui Xiang,Nana He,Junhao Zhang,Lili Li,Shujun Dong
Chitosan (CS) based nanofibrous membranes were fabricated via hybrid electrospinning of chitosan (CS) and poly(ε-caprolactone) (PCL) or poly(ε-caprolactone)-block-poly(ethylene glycol) (PCL-b-PEG) copolymers for the adsorption of dyes from aqueous solution. The amphiphilic block polymers were obtained by polymerization of PCL and different molecular weights of PEG. It was observed that the secondary fiber and core–shell structure could be controlled by PEG segments. The results of XPS showed that as the molecular weight of the PEG segments increased, the content of CS on the fiber surface increased. The parameters of adsorption time, initial concentration and pH values on the adsorption capacity were studied. The adsorption experiments showed that the adsorption process toward Congo red (CR) on CS-based membranes fitted well with the pseudo-second-order model and Langmuir isotherm model. The CS-based membranes with PEG molecular weight of 5 kDa possessed good reusability and the maximum adsorption capacity calculated from the Langmuir model was 291.55 mg g−1. The existence of intermolecular hydrogen bonds between CS and PCL-b-PEG copolymer reduced the loss of CS. Therefore, CS-based membranes would be promising materials for water remediation.
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ACS Applied Nano Materials
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2021
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IF 5.097
Bin Zuo,Qinyue Deng,Han Shao,Bingbing Cao,Yunhui Fan,Wanfang Li,Mingxian Huang
In this work, we designed the Fe3O4@mesoporous-SiO2@chitosan@polyaniline core–shell nanoparticles (Fe3O4@mSiO2@CS@PANI, hence abbr. FSCP), which can be used to capture Cr(VI) in wastewater. Rapid adsorption behavior and high removal capability (249.6 mg Cr(VI) per gram of FSCP) were exhibited by this material. X-ray photoelectron spectroscopy (XPS) analysis demonstrates that Cr(VI) was adsorbed and in situ reduced on FSCP at pH 2. Adsorption was facilitated by the electrostatic attraction of HCrO4– and −N+═C–/–N+H–, while the active −NH–/–N+H– sparked the reduction of Cr(VI) to Cr(III). Moreover, the coordination of the resulting Cr(III) with the amino group promoted adsorption, thus achieving detoxification of Cr(VI) in wastewater. After eight recycling experiments, the Cr(VI) removal efficiency of this material is still more than 90%, indicating that this material has excellent stability and good application potential. Therefore, this magnetic adsorbent offers a potential solution for the successful handling of chromium-containing wastewater.
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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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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Xin Li,Yanli Lu,Zhenghan Shi,Guang Liu,Gang Xu,Zijian An,Huan Xing,Qingmei Chen,Ray P.S. Han,Qingjun Liu
Two-dimensional (2D) materials provides large surface area for H 2 O molecules adsorption and interaction, which has been utilized in humidity sensing and noninvasive monitoring of physiological events such as respiration. However, disadvantages including slow response or modest response hinder the accurate tracking of human breath. Hence, MXene , the new member of 2D material family with excellent hydrophilicity and tunable conductivity, has drawn much attention. In this work, the enhanced response of Ti 3 C 2 T x MXene to H 2 O molecules was achieved by onion-inspired assembling of Ti 3 C 2 T x MXene and chitosan-quercetin hybrid layer-by-layer. The chitosan-quercetin modified multilayers suppress the degradation of MXene in environment, exhibiting superior response (317 % at 90 % RH), ultrafast response (0.75 s), and long-term stability (more than 15 days). Integrated with a wireless flexible detecting tag, the multilayers realized wearable human respiration monitoring with robust, accurate tracking capacity, offering a facile and feasible method for versatile physiological monitoring based on humidity sensing.
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CARBOHYDRATE POLYMERS
·
2020
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IF 7.182
Ce Gao,Xue-Lian Wang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai
Superior mechanical properties, high adsorption capacity, and excellent regeneration property are crucial design criterions to develop a new-type aerogel for adsorptive applications towards heavy metal removal from water. Herein, chitosan and melamine not only introduced abundant functional groups to increase adsorbing sites for lead ions, but also reinforced the three-dimensional network skeleton structure of absorbents to improve the service life in adsorption applications. As-fabricated alginate/melamine/chitosan aerogel can extract Pb (II) from aqueous solution efficiently, i.e. , the optimum adsorption quantity of 1331.6 mg/g at pH 5.5, which exhibited excellent and selective adsorption capacity for Pb (II) against the competition of coexisting divalent metal ions. More importantly, alginate/melamine/chitosan aerogel could be regenerated using dilute acidic solution and recovered well after eight adsorption-desorption cycles. This work might offer a new idea for design and preparation of biomass-based aerogel sorbents with promising prospect in the remediation of Pb (II)-contaminated wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yaoyao Huang,Huaili Zheng,Hong Li,Chun Zhao,Rui Zhao,Siqi Li
The separation and recovery of uranium resources from nuclear waste solutions is important for achieving uranium reuse and environmental protection. In this study, a novel adsorbent, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA)-decorated chitosan-coated magnetic silica nanoparticles, was fabricated and applied to the highly selective adsorption of uranium from aqueous solution. Selective sorption in a multi-ion solution (pH 4.0) containing 14 coexisting cations resulted in CoFe 2 O 4 @SiO 2 @CS-PBTCA showing an excellent uranium adsorption capacity of up to 83.16 mg g −1 , which was much higher than that of ungrafted CoFe 2 O 4 @SiO 2 @CS (29.99 mg g −1 ). The adsorbent also exhibited higher acid resistance than uncoated silica adsorbent under pH 1.0 conditions, with CoFe 2 O 4 @SiO 2 @CS-PBTCA showing barely any iron and cobalt leaching, while CoFe 2 O 4 @CS-PBTCA showed iron and cobalt leaching amounts of 2.97 and 0.93 mg L −1 , respectively. The desorption experiment used 0.2 M PBTCA (pH 1.0) as eluent, with the results showing that uranium ions were readily and rapidly desorbed. Furthermore, CoFe 2 O 4 @SiO 2 @CS-PBTCA maintained outstanding stability and adsorption performance after five reuse cycles. The mechanism for U(VI) removal was investigated by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, with the results suggesting that the adsorbent binds to uranium mainly though oxygen atoms of carboxyl groups and phosphonic groups in PBTCA. This strategy shows strong potential for developing a variety of novel, highly active, acid resistance, and reusable immobilized functional magnetic materials for effective separation of uranium from a multi-ion solution.
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高影响因子
CARBOHYDRATE POLYMERS
·
2020
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IF 7.182
Zhao Zhao,Mei Ji,Qianqing Wang,Nannan He,Yue Li
Off-target drug delivery, together with multidrug resistance (MDR), are two keys obstacles that account for the disappointing outcome in clinical chemotherapy of cancer. To solve these dilemmas, Herein, we constructed cancer cell membrane (CCM) modified silica (CS) nanoparticles (CCM/CS) to co-deliver Ca 2+ channel siRNA with doxorubicin (DOX) to construct a platform (CCM/CS/R-D) for the efficient therapy of cervical cancer. It was demonstrated that the optimal CCM/CS/R-D was spherical nanoparticles with size at 122.39 ± 4.69 nm and the surface charge of -27.76 ± 3.12 mV. In addition, the CCM/CS/R-D showed acid responsive drug release while high stability under physiological conditions with negligible hemolysis. The CCM/CS/R-D showed CCM mediated cellular uptake and efficient endosomal escape as well as siRNA transfection potential (comparable to that of PEI 25 K) on MDR cervical cancer cells (HeLa/DOX). Most importantly, the MDR of cancer cells was conquered through modulation of T-type Ca 2+ (Cav) channels. It was observed that the Cav channel siRNA could negatively regulate the level of cytosolic Ca 2+ concentration which triggered G0/G1 phase cell cycle arrest and elevated intracellular drug retention in HeLa/DOX cells without significantly affect the expression of P-glycolprotein (P-gp). The in vitro and in vivo experiments revealed that CCM/CS/R-D exerted greatly enhanced tumor targetability and therapeutic effect on HeLa/DOX, which was superior than CS/R-D or mono delivery system (CCM/CS/R or CCM/CS/D).
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