NANO
·
2022
·
IF 1.438
Qian Sun,Jin Yang,Zulin Da,Yongsheng Yan
With the rapid development of the chemical industry, oil/ water emulsion separation is receiving global attention. It is particularly important to find a low-cost, convenient, economical and environmentally friendly method to prepare superhydrophilic/ underwater superoleophobic membranes for oil/ water emulsion separation. In this paper, discarded cigarette butts were used as raw materials, combined with chitosan to form a superhydrophilic/ underwater superoleophobic membrane through a phase inversion method. The performance of CA/CS membrane is controlled by adjusting the ratio of cellulose acetate and chitosan. The cigarette butts are washed in ethanol solution to remove impurities to obtain cellulose acetate, and then chitosan and polyvinylpyrrolidone (PVP) are added to build the micro–nano structure on the surface of the membrane. The prepared CA/CS composite membrane was superhydrophilic/ underwater superoleophobic. For the oil-in-water emulsion, the filtrate of the CA/CS membrane can hardly see the oil droplets through electron microscope. CA/CS membrane has a higher emulsion permeation flux (more than 340 L m − 2 h − 1 ) and a higher separation efficiency (more than 97.1%). In addition, the membrane has good reusability within 10 cycles. This method can reduce the harm of cigarette butts to nature and can also be used for oil–water separation. The method of turning discarded cigarette butts into treasure is worthy of social advocacy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xin Yan,Huacai Ge
In this study, a novel modified chitosan composite adsorbent (UNCS) was prepared by crosslinking between chitosan and metal organic frameworks (MOFs) material UiO-66-NH 2 using epichlorohydrin as crosslinker. The influence of the prepared conditions was investigated. The structure and morphology of the composite were characterized by FT-IR, XRD, SEM, TGA, BET and zeta potential analysis. Effects of different variables for adsorption of Hg(II) on this adsorbent were explored. The kinetic studies indicated that the adsorption process followed the pseudo-second-order kinetic model and the adsorption equilibrium could be reached within 2 h. The adsorption was mainly controlled by chemical process. Adsorption isothermal studies illustrated that the adsorption fitted Langmuir isotherm model, implying the homogeneous adsorption on the surface of the adsorbent. The adsorbent exhibited high uptake and the maximum capacity from Langmuir model could reach 896.8 mg g −1 at pH 6. Thermodynamic studies showed the spontaneous nature and exothermic nature of the adsorption process. Additionally, the removal of Hg(II) on UNCS could achieve over 90 %. The adsorption-desorption cycled experiments indicated the appropriate reusability of the adsorbent. Hence, this adsorbent would be promising for the removal of Hg(II) from wastewater.
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Sustainable Materials and Technologies
·
2023
·
IF 9.6
Jiafu Shen,Yu Dai,Fan Xia,Xiaojin Zhang
Due to high security and versatility, hydrogels have attracted great interest in sustainable applications such as wastewater treatment and energy storage. However, the poor adsorption capacity as an adsorbent and the low conductivity as an electrolyte seriously restrict the sustainable application of hydrogels. Here, we prepare nanocomposite hydrogels (PAAm/CS-EDTA/GO) by mixing ethylene diamine tetraacetic acid (EDTA)-modified chitosan (CS) and graphene oxide (GO) in crosslinking polymerization of acrylamide (AAm). Nanocomposite gives PAAm/CS-EDTA/GO hydrogel excellent mechanical properties (e.g., fracture energy of ∼1208 kJ∙m −3 ). EDTA, CS and GO support rich and special adsorption sites for the removal of metal ions and dyes. The addition of lithium chloride (LiCl) makes PAAm/CS-EDTA/GO/Li hydrogel have anti-freezing and anti-dehydration properties. Interestingly, the synergy of CS-EDTA and GO increases the conductivity of the hydrogel. The supercapacitor assembled by PAAm/CS-EDTA/GO/Li hydrogel electrolyte shows high capacitance and temperature tolerance. Our work provides a route for the rational development of adsorption materials and energy storage devices for sustainable applications.
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Lihui Zhang,Min Zhang,Benu Adhikari,Lujun Zhang
High salt intake is one of the reasons causing dietary risk for death from noncommunicable diseases. In this study, citric acid-crosslinked chitosan (CsC) was prepared using chitosan and citric acid under radio frequency (RF) assisted method, which was considered to absorb Cl − in NaCl and further produce high-saltiness microspheres to regard as a low-sodium salt. The characterization and in vitro bioaccessibility of salt microspheres treated with RF (CsC-RF-NaCl) were investigated. The maximum Na + release capacity of CsC-RF-NaCl occurred for 3 h at 30 mm of plate spacing, pH 4 and NaCl-to-CsC-RF mass ratio of 2:1. Electrostatic attraction was responsible for the formation of CsC-RF-NaCl microparticles. CsC-RF-NaCl microparticles exhibited an irregular spherical shape, the surface of microspheres showed a more homogeneous Na + and Cl − dispersion and higher ratio of Na: Cl. CsC-RF-NaCl microparticles were excellent thermal stability, and pleasantly hygroscopic. In addition, the CsC-RF-NaCl microparticles showed the higher release of Na + during oral digestion and lower bioaccessibility in intestinal digestion. The Na + content of CsC-RF-NaCl microparticles was decreased up to 61.80% compared to NaCl at the same saltiness. Therefore, CsC-RF-NaCl microparticles were considered as a low-sodium salt for surface-salted foods.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 8
·e53501
·
IF 3.057
Chenxi Lou,Xinwen Liu,Cong Yang,Fenxia Ye,Qi Zhou
A one-step method was developed for synthesizing Ag nanoparticles exposed on the chitosan-covered polyamide 6 (CS-Ag@PA6) nanofibers by the in-situ reduction of silver nitrate during the electrospinning process. The bioderived CS was employed as a stabilizer and chelating carrier of Ag 0 /Ag + through its functional groups. CS was also used as a tractive agent to promote the surface migration of Ag atoms owing to its polyelectrolytic properties and immiscibility with PA6. Formic acid was used as the co-solvent for PA6 and CS and the reducing agent for Ag + . It was verified that the Ag nanoparticles (AgNPs) with 31.7% Ag 0 were embedded inside the pure PA6 nanofibers. However, the incorporation of CS achieved the AgNPs with an improved reduction efficiency (i.e., 67.5% of Ag 0 ). In particular, the CS nanolayers were covered on the PA6 nanofiber skeleton, where the AgNPs migrated on the surface of the CS nanolayers. This surface migration of CS and AgNP S endowed a significantly enhanced catalytic activity to the reduction of 4-nitrophenol, where the reduction rate constant ( k ) and turnover frequency (TOF) were an order of magnitude higher than that of the CS-free nanofibers.
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MEAT SCIENCE
·
2022
·
IF 7.077
Huiyun Zhang,Xinling Li,Huaibin Kang,Xinyan Peng
The potential of chitosan nanoparticles (CHNPs) for improving the quality stability of pork patties under freeze-thaw (F-T) cycles was studied. Chitosan nanoparticles were successfully produced by the ionotropic gelation method. Pork patties were incorporated with 0%, 0.5% chitosan, 1% chitosan, 0.5% CHNPs, and 1% CHNPs and then subjected to repeated F-T cycles. Results showed that CHNPs were able to inhibit lipid and protein oxidation with a significant decrease in the lipid malondialdehyde and protein carbonyl formation in the patties after seven F-T cycles. Low-field nuclear magnetic resonance (LF-NMR) results indicated that CHNPs effectively restrained water mobility of samples. In addition, CHNPs exhibited a distinguishable improvement in the textural properties and water holding capacity in the stored patties during F-T cycles. Thus, CHNPs could be used as a natural ingredient to protect frozen patties from quality degradation caused by temperature fluctuations.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Rong Rong,Hao Li,Xiangyang Dong,Liqun Hu,Xiaowen Shi,Yumin Du,Hongbing Deng,Yue Sa
Proper bone scaffolds should be biocompatible, mechanically robust and porous for cell migration. Here, pure silk fibroin (SF)- chitosan (CS) aerogel scaffolds reinforced with different amount of SF nanofibers (SF-CS/NF 1% , SF-CS/NF 2% and SF-CS/NF 3% ) are prepared for bone regeneration. Surface morphology and composition were analyzed to ensure successful integration of each component. Incorporating 3 % nanofibers endowed the aerogels with a resistance to 3.5 times the compressive stress of the pure SF-CS aerogels. The benefits of nanofibers were also confirmed by the high porosity of 72.3 ± 1.3 %, the regulated pore size and the high-water uptake ratio of 1770.4 ± 156.8 %. Enhanced cell viability of the aerogel scaffolds was verified with Cell Counting Kit-8 (CCK-8) assays, and confocal microscopy and scanning electron microscopy (SEM) images were taken to assess the cell migration and distribution. The cell differentiation on the aerogel scaffolds was evaluated with enzyme-linked immunosorbent assay (ELISA). Significantly higher level of Collagen type I (Col-I), osteocalcin (OCN), osteopontin (OPN), and alkaline phosphatase (ALP) expression was observed on SF-CS/NF 3% aerogels. This biocompatible nanofiber-reinforced aerogel scaffold facilitates osteogenic differentiation by rougher surface, enhanced mechanical strength and well-regulated pores. Thus, as-prepared scaffolds may be further applied in bone regeneration field.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 3
·951-961
·
IF 2.8
Qi Jiawei,Yu Xiaobo,Chen Bingshuai,Zhuo Haitao,Chen Shaojun
Si/Gr anodes have high specific capacity but their cycle stability is not ideal due to excessive volume expansion during discharge/charge cycling, thereby limiting the commercialization of lithium-ion batteries (LIBs). In this paper, a chitosan-polyvinyl alcohol (CS-PVA) water-based binder was prepared. Unlike conventional one-dimensional structural adhesives, CS-PVA adhesives are rich in hydroxyl and amino polar groups. The polar groups induced interactions with Si–OH on silicon particles, further enhancing the structural stability of Si/Gr anode to maintain long-term stable cycling of LIBs. In addition, the Si/Gr anode formed a stable solid electrolyte interface (SEI) during the activation process, leading to long-term stable cycling Si/Gr anodes. The first Coulomb efficiency of Si/Gr@PC11 anode reached 85.5%. And at the current density of 0.5C, the discharge capacity stabilized at 505mAh g −1 after 200 cycles, and reached 433mAh g −1 after 500 cycles. In summary, the success of this work provides a promising avenue to develop high-capacity lithium battery packs with extended cycle life.
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International Journal of Bioprinting
·
2023
·
IF 8.4
Zhijing He,Chen Jiao,Junnan Wu,Jiasen Gu,Huixin Liang,Lida Shen,Youwen Yang,Zongjun Tian,Changjiang Wang,Qing Jiang
Porous hydroxyapatite (HA) scaffolds prepared by three-dimensional (3D) printing have wide application prospects owing to personalized structural design and excellent biocompatibility. However, the lack of antimicrobial properties limits its widespread use. In this study, a porous ceramic scaffold was fabricated by digital light processing (DLP) method. The multilayer chitosan/alginate composite coatings prepared by layer-by-layer method were applied to scaffolds and Zn 2+ was doped into coatings in the form of ion crosslinking. The chemical composition and morphology of coatings were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). Energy dispersive spectroscopy (EDS) analysis demonstrated that Zn 2+ was uniformly distributed in the coating. Besides, the compressive strength of coated scaffolds (11.52 ± 0.3 MPa) was slightly improved compared with that of bare scaffolds (10.42 ± 0.56 MPa). The result of soaking experiment indicated that coated scaffolds exhibited delayed degradation. In vitr o experiments demonstrated that within the limits of concentration, a higher Zn content in the coating has a stronger capacity to promote cell adhesion, proliferation and differentiation. Although excessive release of Zn 2+ led to cytotoxicity, it presented a stronger antibacterial effect against Escherichia coli (99.4%) and Staphylococcus aureus (93%).
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zehao Li,Haibo Li,Xianglong Zeng,Shuming Liu,Yongsheng Yang
The world faces increase in water scarcity and water pollution. A combined effect of adsorption and photodegradation is potential way to remove pollutants from water. In this work, mannose grafted chitosan (CSMan) films were synthesized due to Schiff base. To improve the adsorption and photodegradation capacity of films, graphite carbon nitride-zinc oxide (gCNMZnO0.3) was introduced into a system through solvent volatilization to remove tetracycline (TC). Comfortingly, the composite films of CSMan-gCNMZnO0.3-1 displayed outstanding adsorption capacity and excellent activity of degrading organic pollutant by visible light in water. The maximum adsorption capacity of CSMan-gCNMZnO0.3-1 was 164.627 mg g −1 through surface complexation, cation exchange, electrostatic attraction, hydrogen bonding, π–π interaction and plane strengthening effect. The analysis revealed that OH and h + were the crucial radicals in photodegradation process. Meanwhile, CSMan-gCNMZnO0.3-1 possessed superior reusability and broad applicability in five distinct types of water. The simulation experiment of silicone tube showed the combined effect had a removal ratio of 84.3 % in 120 min, and the adsorption-photodegradation efficiency was constant in operating after five continuance usages.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xue Zhang,Xueya Xu,Xiaoying Wang,Yajuan Lin,Yaling Zheng,Wen Xu,Jian Liu,Wei Xu
A glycyrrhetinic acid-modified carboxymethyl chitosan-thioketal-rhein (GCTR) conjugate was designed and synthesized for the in vivo delivery of celastrol (Cela). Cela was encapsulated into polymeric micelles (PMs) formed by GCTR conjugates self-assembly in water to form Cela/GCTR PMs with high drug loading capacity and small particle size. Cela/GCTR PMs had a sustained-release characteristic in the blood environment and a rapid-release feature in the tumor microenvironment. Cela/GCTR PMs had a significant proliferation inhibitory effect on HepG2 and BEL-7402 cells, but a negligible impact on L-02 cells at low concentrations. Cela/GCTR PMs possessed reactive oxygen species (ROS)-responsive properties in vitro and in cells, could improve the bioavailability of Cela, and exert remarkable hepatoma-targeting properties. Cela/GCTR PMs could also effectively inhibit tumor growth with no apparent damage to different organs. In summary, GCTR PMs with good ROS-responsive and hepatoma-targeting properties are expected to be possible delivery carriers for hydrophobic antineoplastic drugs for hepatocellular carcinoma therapy.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Chaojian Zhang,Tianrui Yang,Junsheng Liu,Qianqian Duan,Jiahui Song,Youjun Yin,Hansong Wang
Novel poly(ethylene imine) (PEI) modified chitosan-based hybrid membranes (PMCHMs) were created via a soft chemistry method, in which unmodified chitosan (CS) firstly reacted with PEI to produce a CS-PEI precursor. Later, such CS-PEI precursor was blended with silicone to create the membrane solution of PMCHMs. Finally, PMCHMs could be obtained via phase-inversion process. Multi-component sorption of Pb 2+ , Cu 2+ and Ni 2+ on PMCHMs in metal mixed solutions, such as, Pb 2+ &Cu 2+ and Pb 2+ &Ni 2+ binary, Pb 2+ , Cu 2+ and Ni 2+ ternary, as well as Pb 2+ , Cu 2+ , Ni 2+ , Cd 2+ and Cr 3+ quintuple mixed solutions, was inspected. The calculation of effective diffusion coefficients, distribution coefficients and selectivity coefficients showed that Pb 2+ sorption on PMCHMs had excellent selectivity in these mixed multi-metal solutions. While, the calculation of activation energy proved that Pb 2+ , Cu 2+ and Ni 2+ sorption on PMCHMs was a physic-sorption process Also, mechanism insight reveals that Pb 2+ sorption on PMCHMs could be depicted via Lagergren pseudo-2nd-order kinetic model and Langmuir or Freundlich isotherm equation. Exclusively, intra-particle diffusion process was discussed in detail. Desorption testing verified that HCl is a good desorbent for metals sorption on PMCHMs and the cycle time of membranes can arrive at 6 times. These results demonstrate that PMCHMs can be used to preferentially eradicate Pb 2+ from metal mixture solutions, showing prospective applications in the treatment of metal mixture wastewater from waste vehicle power-battery and other various metal-bearing polluted water.
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