ACS Omega
·
2021
·
IF 3.512
Abdelazeem S. Eltaweil,Injy M. Mamdouh,Eman M. Abd El-Monaem,Gehan M. El-Subruiti
Herein, we report a new metal–organic framework (MOF)-based composite beads adsorbent made via incorporating UiO-66 MOF, carboxylated graphene oxide (GOCOOH) into sodium alginate for efficient removal of methylene blue dye, and Cu2+ ions. The successful fabrication of the synthesized UiO-66/GOCOOH@SA composite beads was confirmed by means of X-ray diffraction, Fourier transform infrared, scanning electron microscopy, zeta potential, X-ray photoelectron spectroscopy analysis, and thermogravimetric analysis and BET measurement. The incorporation of both UiO-66 and GOCOOH into SA beads greatly increased their adsorption efficiency for the removal of both MB and Cu2+ with maximum adsorption capacities of 490.72 and 343.49 mg/g, respectively. The removal process of both MB and Cu2+ follows the pseudo-second-order model and Freundlich isotherm model. A plausible adsorption mechanism was discussed in detail. Regeneration tests clarified that the removal efficiencies toward both MB and Cu2+ remained higher than 87% after five cycles. These results reveal the potentiality of UiO-66/GOCOOH@SA beads as an excellent adsorbent.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Wei Huang,Lihua Zhao,Jiayan Zhang,Hao Wen,Ziyi Zhu,Ping Wang,Yizhen Liu,Changkun Liu
In the current research, preparation of a forward osmosis membrane that can effectively reject heavy metals in wastewater treatment would prove to be highly beneficial. Here, an innovative forward osmosis (FO) membrane with a “sandwich” structure (formed via the template method) was achieved for the first time through the fabrication of a porous hydrogel sublayer. A porous hydrogel matrix with excellent water retention capacity was formed through the crosslinking reaction of sodium alginate and calcium chloride in the presence of zinc oxide (ZnO) nanoparticles, followed by etching to remove the ZnO nanoparticles in the sublayer to produce the porous structure. The water flux of the modified membrane was quintuple compared with the that of the original membrane, with no reduction on the salt rejection performance. The surface polyamide layer and sublayer acted as double barriers and achieved a rejection rate of over 98% for heavy metal ions (Cd 2+ , Cu 2+ , Pb 2+ , Ni 2+ ), when the glucose solution was used as the draw solution. The inclusion of the porous sublayer can provide deeper insights into the fabrication of high-performance FO membranes, and expand their applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
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IF 5.162
Wenru Liu,Jun Mei,Jing Xie
In this study, the microbiological, physicochemical, and flavor changes of turbot ( Scophthalmus maximus ) coated with a composite active coating of locust bean gum (LBG) and sodium alginate (SA) supplemented with daphnetin emulsions (0.16, 0.32, 0.64 mg·mL −1 ) were determined during 18 days of refrigerated storage (4 ± 1 °C). Results showed that LBG-SA coatings containing 0.32 mg·mL −1 daphnetin emulsions could significantly lower the total viable count (TVC), psychrophiles , Pseudomonas spp. and H 2 S-producing bacteria counts , and inhibit the productions of off-flavor compounds including the total volatile basic nitrogen (TVB-N), trimethylamine (TMA) and ATP-related compounds. 32 volatile compounds were identified by solid phase microextraction combined with gas chromatography-mass spectrometer method (SPME-GC/MS) during refrigerated storage and the treated turbot samples significantly lowered the relative content of fishy flavor compounds. Further, the LBG-SA coatings containing daphnetin could also delay the myofibril degradation of the turbot samples. These results indicated that the LBG-SA coatings with 0.32 mg·mL −1 daphnetin were a potential alternative way to improve the quality of turbot during refrigerated storage.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yue Wang,Chuanbo Ding,Yingchun Zhao,Jinping Zhang,Qiteng Ding,Shuai Zhang,Ning Wang,Jiali Yang,Siyu Xi,Ting Zhao,Chunli Zhao,Wencong Liu
Diabetes-related ulcers are still a therapeutic problem because of their susceptibility to infection, ongoing inflammation, and diminished vascularization . The design and development of novel dressings are clinically urgent for the treatment of chronic wounds due to diabetic ulcers. In this study, we made taxifolin (TAX) loaded sodium alginate (SA)/poly(vinyl alcohol) (PVA) nanofibers for the treatment of chronic wounds. The SA/PVA/TAX nanofibers that have been created are smooth and bead-free, with good thermal stability , hydrophilicity , and mechanical properties. The release profile indicated a sustained drug release , with a cumulative release rate of 64.6 ± 3.7 % at 24 h. In vitro experiments have shown that SA/PVA/TAX has good antibacterial activity , antioxidant activity , and biocompatibility. In vivo experiments have shown that SA/PVA/TAX exhibits desirable biochemical properties and is involved in the diabetic wound healing process by promoting cell proliferation (Ki67), angiogenesis (CD31, VEGFA), and alleviating inflammation (CD68). Western blotting experiments suggest that SA/PVA/TAX may promote diabetic wound healing by inhibiting the TLR4/NF-κB/NLRP3 signaling pathway and upregulating the expression of VEGFA and PDGFA . The 16S rRNA sequencing results showed that SA/PVA/TAX increased the wound surface flora's diversity and reversed the skin microbiota's structural imbalance. Therefore, SA/PVA/TAX can promote diabetic wound healing by modulating the inflammatory response, angiogenesis, and skin flora and has the potential to be an excellent wound dressing.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
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IF 3.8
Yongqiang Wang,Enfa Fu,Summaira Saghir,Zhenggang Xiao
The low water absorbency, poor thermal stability, and high cost of absorbent polymers remain significant challenges that need addressing to broaden their range of applications. To address these drawbacks of superabsorbents, a novel superabsorbent polymer composite (SAPc) SA-g-P(AA-co-AM)/MDE was developed using a simple aqueous polymerization method involving sodium alginate (SA), modified diatomite (MDE), acrylic acid (AA), and acrylamide (AM). The synthesized materials were systematically characterized using various techniques, including FT-IR, SEM, and XRD, to determine their chemical structure, morphology, and crystal structure. The water absorbency capacity (WAC) of SA-g-P(AA-co-AM)/MDE increased with increasing SA dosage, but it gradually declined once it exceeded 5 wt.%. The SAPc with the highest water absorbency was obtained when the SA content was 5 wt.% in both distilled water and NaCl solution. The absorption data of SA-g-P(AA-co-AM)/MDE fit well with the pseudo-first-order (PFO) kinetic model. The results of water retention capacity (WRC) demonstrated that the water-retaining time of the SAPc increased by 39.0 % compared to P(AA-co-AM). Additionally, thermal gravimetric analysis revealed that the introduction of MDE and SA enhanced the SAPc's thermal stability. Therefore, this study demonstrates that the introduction of SA and MDE can lead to SAPc with outstanding WAC, WRC, and thermal stability. These findings suggest that the SAPc prepared in this study could be a promising material for use in agriculture, industry, and sanitary goods.
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FOOD CHEMISTRY
·
2023
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IF 8.8
Zhikun Yang,Mingrui Li,Yanxiao Li,Xiaowei Huang,Zhihua Li,Xiaodong Zhai,Jiyong Shi,Xiaobo Zou,Jianbo Xiao,Yue Sun,Megan Povey,Yunyun Gong,Melvin Holmes
The poor biological, mechanical and water-resistance properties of sodium alginate/guar gum film (SG) limit its application in food preservation. To overcome this disadvantage, we added β-Cyclodextrin/persimmon pectin-stabilized baobab seed oil Pickering emulsion (BOPE) to enhance the mechanical and water resistance properties of SG film, and added green synthesized silver nanoparticles (AgNPS) and Lycium ruthenicum extract (LA) to improve the biological properties of the film. The properties of BOPE was optimized using Box–Behnken design (BBD). Scanning electron microscope and Fourier transform infrared results revealed the change of structure and molecular interaction in the SG film after the addition of AgNPS, LA, and optimized BOPE. The 2.0%BOPE-loaded film containing AgNPS/LA with the enhanced mechanical, barrier, BO retention, and biological properties not only improved the preservation effect on mushroom ( A. bisporus ), but also maintained structural stability. Thus, the 2.0%BOPE-loaded SG/LA/AgNPS film has considerable potential in active packaging applications.
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Polymers
·
2023
·Vol. 15
·期 21
·4308
·
IF 5
Kai Jiang,Jiang Li,Margaret Brennan,Charles Brennan,Haiyan Chen,Yuyue Qin,Mingwei Yuan
The aim of this study was to prepare a novel pH-sensitive smart film based on the addition of purple garlic peel extract (PGE) and TiO2nanoparticles in a sodium alginate (SA)/polyvinyl alcohol (PVA) matrix to monitor the freshness of beef. FT-IR spectroscopy revealed the formation of stronger interaction forces between PVA/SA, PGE, and TiO2nanoparticles, which showed good compatibility. In addition, the addition of PGE improved the tensile strength and elongation at break of the composite film, especially in different pH environments, and the color response was obvious. The addition of 1% TiO2nanoparticles significantly improved the mechanical properties of the film, as well as the light barrier properties of the film. PGE could effectively be uniformly dispersed into the composite film, but it also had a certain slow-release effect on the release of PGE. PGE had high sensitivity under different pH conditions with rich color changes, and the color showed a clear color change from red to yellow-green when the pH increased from 1 to 14. The same change was observed when it was added to the film. In particular, by applying this film to the process of beef preservation, we judged the freshness of beef by monitoring the changes in the TVB-N value and pH value during the storage process of beef and found that the film showed obvious color changes during the storage process of beef, from blue (indicating freshness) to red (indicating non-freshness), and finally to yellow-green (indicating deterioration), which indicated that the color change of the film and the freshness of the beef maintained a highly consistent.Keywords:smart packaging;anthocyanins;color response;beef freshness;indicator film
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Yu Zhao,Jiachen Kang,Wenzhe Huang,Peng Kong,Di An,Gufeng He
Copper nanowire (CuNW), with combined advantages of high conductivity and cost-effectiveness, is considered a promising material for the development of next-generation transparent conductive films (TCFs) in the field of flexible optoelectronics. However, the practical application of CuNW TCFs is hindered by some limitations, such as conductivity degradation and poor adhesion. Here, we demonstrate a stable CuNW composite film by embedding CuNWs into a polydopamine (PDA)-modified sodium alginate (NaAlg) matrix without sacrificing the optoelectronic properties of the CuNW network. The introduction of the PDA modifier significantly enhances the antiaging capability of the NaAlg layer, providing strengthened protection of the embedded CuNWs against moisture and oxygen, thereby resulting in minimal degradation of the conductivity of CuNWs for up to 9 months under ambient conditions. Simultaneously, the interface adhesion between the CuNW network and the substrate is further enhanced due to the abundance of catechol structures in PDA, allowing for the maintenance of the electrical conductivity of the CuNW network even under cyclic external bending stress and tape-peeling forces. In addition, embedding CuNWs into the polymer binding layer produces a CuNW composite film with a very smooth surface. A flexible OLED based on the PDA-modified NaAlg/CuNW TCF is successfully fabricated, exhibiting performance comparable to that of a traditional rigid indium tin oxide-based device, while also demonstrating remarkable mechanical durability. The modification strategy can promote practical applications of the CuNW network in flexible optoelectronic devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chen Chen,Enhui He,Weina Jia,Shuwei Xia,Liangmin Yu
The rapid development of the printing and dyeing industry has led to the production of a large amount of high-density printing and dyeing wastewater, and technology for its effective treatment has become a focus of research. To construct a polymeric adsorbent material with abundant functional groups for the efficient adsorption of dye wastewater, a novel magnetic sodium alginate/carboxymethylcellulose interpenetrating network gel sphere (Fe 3 O 4 @SA/CMC-Fe) was prepared by co-blending sodium alginate (SA) and sodium carboxymethylcellulose (CMC) with Fe 3 O 4 ; Fe 3 O 4 @SA/CMC-Fe was characterized by SEM–EDS, XRD, TGA , FT-IR, UV–Vis, VSM, BET-BJH and XPS . Static adsorption experiments showed that the optimal rates for adsorption of DV 51 and DR 23 from solutions with neutral pH values by Fe 3 O 4 @SA/CMC-Fe were up to 96 %, the adsorption process exhibited a Langmuir adsorption isotherm, and the dynamic adsorption process was accurately described by the pseudo-second-order kinetic model. A thermodynamic study showed that the adsorption reactions were all spontaneous exothermic reactions with increasing entropy. The mechanism for adsorption of the dyes by Fe 3 O 4 @SA/CMC-Fe involved hydrogen bonding, complexation and electrostatic adsorption. In summary, Fe 3 O 4 @SA/CMC-Fe is a green, simple, recyclable and highly efficient magnetic adsorbent that is expected to be widely used in treating dye wastewaters over a wide pH range.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2021
·
IF 2.646
Haosheng He,Haohao Ren,Zhengwen Ding,Mizhi Ji,Hong Chen,Yonggang Yan
In this work, novel magnesium calcium phosphate/sodium alginate composite cements were successfully fabricated with a proper setting time (5–24 min) and high compressive strength (91.1 MPa). The physicochemical and biological properties of the cement in vitro were fully characterized. The composite cements could gradually degrade in PBS as the soaking time increase, and the weight loss reached 20.74% by the end of 56th day. The cements could induce the deposition of Ca–P layer in SBF. Cell experiments proved that the extracts of the composite cements can effectively promote the proliferation and differentiation of the mouse bone marrow mesenchymal stem cells (MSCs). These preliminary results indicate that the magnesium calcium phosphate/sodium alginate composite cements could be promising as potential bone repair candidate materials.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Chenxi Niu,Zhibo Lin,Qian Fu,Yutao Xu,Youhui Chen,Lingbin Lu
In this paper, an eco-friendly versatile superabsorbent material was designed for soil improvement, and a synchronous chemical loading strategy was proposed. In this strategy, urea not only acted as fertilizer but also acted as a crosslinker to construct an alginate network. The microstructure, chemical structure, thermal stability and composition of the obtained SA/urea hydrogel were characterized in detail. Adsorption behavior and application performance in agriculture were evaluated. The results demonstrated that urea had two different conformations in the network. The SA/urea hydrogel had abundant pore structures with excellent water absorption performance. It could not only improve the water retention capacity of soil but also release nitrogen, phosphorus and potassium elements with degradation for as long as 9 weeks. Moreover, the hydrogel could promote plant growth, increase the nutritional composition of plants and inhibit the accumulation of harmful nitrate in plants. With advantages, including biodegradability , high water absorption, controllable degradation, excellent water retention, sustained NPK release and improved plant nutrition value, the SA/urea hydrogel has great potential for soil improvement in agriculture as an eco-friendly versatile water retention agent and can be expected to extend to more fields as a novel superabsorbent material.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Wang Xiangyu,Wu Lan,Ma Jun
The aggregation of nanoscale zero-valent iron (NZVI) is one of the biggest challenges for its application when treating contaminants in aquatic environment. We report a study on synthesis of sodium carbonate-modified biochar (BC-600) combined with sodium alginate (SA)-modified NZVI (SA/NZVI@BC-600) for the removal of tetracycline (TC). When the initial concentration of TC was 20 mg/L, 100% TC was removed by SA/NZVI@BC-600 at an initial pH of 7 under room temperature of 25 °C within 90 min. In addition, the reactivity of the SA/NZVI@BC-600 composites toward TC removal was not obviously declined after 4 cycles. SA/NZVI@BC-600 shows high reactivity, stability, and reusability. This excellent performance of SA/NZVI@BC-600 was related to the addition of SA and BC-600. The best performance of the SA/NZVI@BC-600 system was observed under weakly acidic and neutral conditions. Increasing the initial concentration and lowering the reaction temperature had a slight negative effect on the removal of TC by SA/NZVI@BC-600. In addition, the presence of CO 3 2− and HCO 3 − had a significant negative effect on the degradation of TC. Meanwhile, ·OH and ·O 2 − played the leading role in TC degradation. This study not only reported a novel strategy of synthesizing an excellent BC modified NZVI based catalyst but also evaluated its promising application for antibiotic degradation in aqueous solution.
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