Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Yan-Hua Xie,Yu-Lan Wu,Yin-Hong Qin,Yan Yi,Zhuang Liu,Long Lv,Mo Xu
Perchlorate is an emerging trace contaminant and has been detected in groundwater, surface water, soil, and food globally. Cross-linked magnetic chitosan/poly (vinyl alcohol) beads (CM-CS/PVA Bs) were synthesized and tested to remove perchlorate from water. The complex was characterized by Fourier transform-infrared spectroscopy, transmission electron microscopy, energy-dispersive spectroscopy, and vibrating sample magnetometry. The influence of pH, co-existing anions, contact time, and temperature on adsorption was investigated. Particles were super-paramagnetic and could be recovered easily using an external magnetic field. The CM-CS/PVA Bs could adsorb perchlorate efficiently in a wide pH range from 4 to 10. Co-existing anions would inhibit the adsorption of perchlorate on CM-CS/PVA Bs. Kinetic data were well-described by the pseudo-second-order model. Langmuir and Freundlich isotherms fitted the equilibrium data well. The negative Gibbs standard free energy and enthalpy show that the adsorption process was spontaneous and exothermic. The exhausted adsorbent could be regenerated efficiently by 0.1% NaCl eluent. Therefore, the magnetic property and reusability of the CM-CS/PVA Bs make it suitable for potential application in perchlorate removal from aqueous solution.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Shuiping Wu,Hua Dong,Qingtao Li,Gang Wang,Xiaodong Cao
Hydrogels with good mechanical properties, excellent biocompatibility and designable shapes are of great importance for their biomedical applications. Herein, a series of high strength, biocompatible hydrogels have been synthesized by integrating sodium citrate into the thermally reversible chitosan/gelatin to form multiple physically crosslinking networks. Besides the ideal formability, a thermal etching or welding method has been developed to program the surface morphology and fabricate hydrogels with complicated shapes freely. More impressively, the special hollow “cup-shaped and tubular” structure has also been constructed by applying an interrupted gelation process in controlled ion crosslinking time and the subsequent dissolving process at 37 °C in deionized water. The high strength, biocompatible hydrogels with special internal and external shape adjustable characters, potentially useful in vascular repair and substitutes of cartilage, may further broaden our understanding of the plasticity of the hydrogels.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Huan Wang,Ping Zhang,Jing Liu
A novel triethylene tetramine-functionalized magnetic graphene oxide chitosan composite material (TETA-MGO/CS) with a high adsorption capacity for the phosphate was prepared by chemical coprecipitation and subsequently modified by triethylene tetramine. TETA-MGO/CS was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, vibrating sample magnetometry, X-ray diffraction, thermogravimetry, and Brunauer–Emmett–Teller analyses. The adsorption experiments of phosphate on TETA-MGO/CS were compared with MGO, MGO/CS, and TETA-MGO. Effects of pH, initial concentration of phosphate, adsorption time, and adsorption temperature were studied. The results indicated that the adsorption capacity of the four adsorbents were highly pH dependent and reached optimum at pH 3.0. Adsorption processes reached the equilibrium within 50 min. The adsorption data of the four adsorbents were well-fitted with the Langmuir isotherm. The maximum adsorption capacities of MGO, MGO/CS, TETA-MGO, and TETA-MGO/CS at 298 K calculated from Langmuir isotherm were 300.13, 314.83, 339.65, and 353.36 mg·g–1, respectively. This result is ascribed to an increase of amino after MGO functionalized by TETA and CS. The adsorption mechanism of phosphate on TETA-MGO/CS could be mainly related with electrostatic interaction. Moreover, phosphate ions adsorbed onto TETA-MGO/CS could be desorbed and can be reused three times. It indicated that TETA-MGO/CS can be used as a efficient and renewable adsorbent.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Yongjun Sun,Mengjiao Ren,Chengyu Zhu,Yanhua Xu,Huaili Zheng,Xuefeng Xiao,Huifang Wu,Ting Xia,Zhaoyang You
In this study, acrylamide and [2-(acryloyloxy)ethyl] trimethylammonium chloride were grafted onto CS by UV initiation to obtain an environmentally friendly graft copolymer, CS-g-poly(acrylamide-acryloyloxyethyl) trimethylammonium chloride (CS-g-PAD). Poly(acrylamide-acryloyloxyethyl) trimethylammonium chloride was named as PAD. Nuclear magnetic resonance hydrogen spectroscopy (1H NMR), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and thermal gravimetric analysis (TG-DSC) were used to characterize CS-g-PAD. Results confirmed the synthesis of CS-g-PAD. SEM results showed that CS-g-PAD exhibited a porous structure with numerous 2–6 μm micropores. The enhanced CaCl2-aided flocculation tests of wastewater contaminated by zinc phosphate coating indicated that CS-g-PAD had better flocculation performance than PAD and the commercially available cationic polyacrylamide (CPAM). The removal rates of zinc concentration, total phosphorus concentration, and chemical oxygen demand were 99.3, 98.8, and 72.5%, respectively, at 6 mg·L–1 CS-g-PAD and pH 10. The precipitated flocs were mainly in crystalline form.
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2017
·Vol. 26
·期 7
·531-539
·
IF 1.422
Sun Yujun,Jiang Xiancai,Hou Linxi
Quaternized poly(vinyl alcohol)/chitosan (QPVA/CS) composite membranes were prepared by solution casting method with AlCl 3 ·6H 2 O aqueous solution as solvent for CS and glutaraldehyde as a crosslinker. The crystalline, thermal and mechanical properties of the QPVA/CS composite membranes were studied by Fourier transform infrared spectroscopy, X-ray diffractometry, differential scanning calorimetry, thermogravimetry and tensile test measurements, respectively. The composite membranes were immersed in potassium hydroxide aqueous solution to form polymer electrolyte membranes. The alkaline uptake, swelling ratio, ion conductivity and methanol permeability of the electrolyte membranes were studied. The experimental results indicated that aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) had a positive effect on the mechanical properties of the QPVA/CS composite membrane. The elongation-at-break of this membrane reached the maximum of 401.0%. The alkaline uptake and swelling ratio of the composite membranes decreased. With the addition of 30 wt% AlCl 3 ·6H 2 O, the composite membrane showed the ion conductivity and methanol permeability of 1.82 × 10 −2 S cm −1 and 2.17 × 10 −6 cm 2 s −1 , respectively. These values were higher than those of the membrane with acetic acid as the solvent for CS. The selectivity of the QPVA/CS membrane could reach 8.39 × 10 3 S s cm −3 . This study showed that with AlCl 3 ·6H 2 O as the solution for CS, the high performance QPVA/CS composite alkaline polymer electrolyte membrane could be prepared.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2016
·
IF 4.32
Ping Sun,Wei Huang,Mingji Jin,Qiming Wang,Bo Fan,Lin Kang,Zhonggao Gao
Nanoparticle-mediated small interfering RNA (siRNA) delivery is a promising therapeutic strategy in various cancers. However, it is difficult to deliver degradative siRNA to tumor tissue, and thus a safe and efficient vector for siRNA delivery is essential for cancer therapy. In this study, poly(ethylene glycol)-modified chitosan (PEG-CS) was synthesized successfully for delivering nucleic acid drug. We deemed that PEGylated CS could improve its solubility by forming a stable siRNA loaded in nanoparticles, and enhancing transfection efficiency of siRNA-loaded CS nanoparticles in cancer cell line. The research results showed that siRNA loaded in PEGylated CS (PEG-CS/siRNA) nanoparticles with smaller particle size had superior structural stability in the physical environment compared to CS nanoparticles. The data of in vitro antitumor activity revealed that 4T1 tumor cell growth was significantly inhibited and cellular uptake of PEG-CS/siRNA nanoparticles in 4T1 cells was dramatically enhanced compared to naked siRNA groups. The results from flow cytometry and confocal laser scanning microscopy showed that PEG-CS/siRNA nanoparticles were more easily taken up than naked siRNA. Importantly, PEG-CS/siRNA nanoparticles significantly reduced the growth of xenograft tumors of 4T1 cells in vivo. It has been demonstrated that the PEG-CS is a safe and efficient vector for siRNA delivery, and it can effectively reduce tumor growth and prevent metastasis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Zhengkun Xie,Gaiping Li,Yamin Fu,Mengjiao Sun,Baoxian Ye
Chrysin and baicalein are the major flavonoids found in oroxylum indicum, an essential herb in traditional Chinese medicine (TCM). Owing to their similar characteristics and physiochemical property, it is a great challenge to detect both of them simultaneously. In this work, tantalum oxide (Ta 2 O 5 ) particles and chitosan modified carbon paste electrode (Ta 2 O 5 -CTS-CPE) was prepared and characterized by scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV) and electrochemical impedance spectrum(EIS). Under the optimum conditions, the prepared Ta 2 O 5 -CTS-CPE exhibited excellent electrocatalytic activity toward the oxidation of chrysin and baicalein, and it could serve as the sensor for highly sensitive and simultaneous determination both of them. The linear range is 0.08–4.0 μM for both of them, and the detection limits were determined to be 0.03 and 0.05 μM (S/N=3) for chrysin and baicalein, respectively. Furthermore, the proposed electrochemical sensor displayed high sensitivity, excellent stability and got satisfactory results in oroxylum indicum samples analysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xianghong Xie,Tong Bu,Qianyue Zhu,Libin Ma,Zihan Gao,Ting Du,Shuwen Liu,Jianlong Wang
The bactericidal properties of traditional food coatings mostly depend on the amount of fungicides present, which reduces the sustainability of food packaging. Herein, we proposed a magnetic field to precisely modulate the near-infrared (NIR) absorption activity to enhance antimicrobial coatings sustainability. Inspired by the typical grinding procedure, the assembly of CP/Fe 3 O 4 @TA nanofiber hydrogel was proposed as the coating, applying mechanical force and encouraging the collision of effective molecules of puerarin (PUE), chitosan (CS), and Fe 3 O 4 @TA NFs. This hydrogel design offers precise control over the physical and chemical properties, including appearance, viscoelasticity, and rheology. Particularly, significant changes in photothermal performance were observed as a result of magnetic regulation of NIR absorption activity. As a result, the CP/Fe 3 O 4 @TA coatings achieve effective bacteria killing performance under NIR irradiation, magnetocaloric effect, boric acid adsorption, and aggregation interference. Finally, the hydrogel coating was applied to the beef surface and serves as an effective barrier against the growth of pathogenic bacteria, thereby preserving the freshness and tenderness of the beef. The finding from this work is expected to open up a new way in active nano hydrogel coating for food preservation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Gang Li,Yayun Li,Chuanxi Lin,Hao Peng,Yunsheng Xue,Wenfeng Qin,Xin Zhao,Bin Zhou
2024 aluminum alloy has high strength, processing performance, and good damage tolerance performance, but it is prone to intergranular corrosion and pitting. Therefore, the development of corrosion protective coatings is essential for the aluminum alloy. In this paper, cerium ion (Ce 3+ ) was doped into chitosan-modified montmorillonite (Ce-CS-MMT) by ion exchange method, and the corrosion protective performance of Ce-CS-MMT epoxy coating (Ce-CS-MMT/EP) was investigated. The electrochemical analysis of aluminum alloy in cerium-containing solution showed the corrosion inhibition efficiency reached 95.52%. The result indicates the corrosion inhibition effect of cerium-containing solution was better than pure NaCl solution and MMT solution. The corrosion study of the coating illustrates that the protection rate of Ce-CS-MMT/EP reached 95.82%, which was higher than that 91.83% of Ce-MMT/EP. The result indicates the resistance of charge transfer was greater and the better shielding effect for electrolyte corrosion ions than MMT and Ce-MMT epoxy coatings, and the corrosion protective performance was excellent.
✓ 已验证
产品关联
DOI
高影响因子
Alexandria Engineering Journal
·
2025
·
IF 6.8
Dong Li
This study investigated the development and application of TiO 2 /chitosan nanocomposite coatings for food preservation, focusing on their physicochemical properties and preservation efficacy. The nanocomposite synthesis achieved uniform particle dispersion with an average size of 85 ± 5 nm and zeta potential ranging from + 35.2 mV to + 42.8 mV. FTIR analysis revealed characteristic coordination bonds at 1384 cm-1 between Ti atoms and chitosan amino groups, while XRD patterns confirmed successful incorporation of TiO 2 nanoparticles without phase transformation. The optimal formulation (1.0 % TiO 2 ) demonstrated remarkable preservation effects, reducing respiratory activity by 42 % compared to controls and maintaining peroxidase activity 65 % lower than untreated samples. MDA levels in treated samples remained at 1.68 μmol/kg compared to 4.25 μmol/kg in controls after 15 days. The nanocomposite coating effectively suppressed microbial growth, maintaining total aerobic counts below 3.5 log CFU/g throughout storage, while preserving essential nutrients with 78 % retention of ascorbic acid content. The addition of thymol enhanced antimicrobial efficacy, generating inhibition zones of 18.5 mm against E. coli. The coating's stability was maintained over 30 days with less than 5 % variation in particle size distribution, demonstrating its potential for commercial food preservation applications.
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 22
·3304
·
IF 3
Saber A. S. Ahmed,Hongyan Zhai,Soon-Thiam Khu
There is a rising concern about the safety risk that trihalomethanes (THMs) in drinking water pose. In this work, to adsorb THMs such as chloroform (TCM), dibromochloromethane (DBCM), bromodichloromethane (BDCM), and bromoform (TBM), we coated chitosan (CS) on coconut shell activated carbon (CAC). The adsorbents were characterized using BET, XRD, FTIR, and SEM techniques. The impact of various variables was examined, including contact time, quantity of adsorbent, initial pH, and initial THM concentrations. Under the same conditions, TCM was adsorbed most efficiently, followed by BDCM, DBCM, and TBM. When the pH was between 4 and 8, the adsorption of THMs onto the coconut shell activated carbon supported chitosan (CS/CAC) varied relatively little; however, when the pH increased above 8, the adsorption of THMs decreased. For THMs, CS/CAC adsorption was a chemical reaction and monolayer adsorption that fit better with the pseudo-second-order kinetic model and the Langmuir isotherm model. According to the thermodynamic study, THMs were adsorbed endothermically and spontaneously on CS/CAC. For column experiments, the adsorption of THMs was influenced by bed height and flow rate. After up to four cycles of adsorption and desorption, it was found that the adsorbent was reusable. The maximum adsorption capacities for Langmuir were 187.27, 114.29, 93.28, and 89.61 µg/g for TCM, BDCM, DBCM, and TBM, respectively. CS/CAC has a high adsorption capacity, especially for TCM, which is responsible for a major portion of THMs in drinking water. This indicates that CS/CAC has a lot of potential uses when it comes to removing THMs from water.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xuerong Luo,Wenting Shi,Imran Mahmood Khan,Lin Yue,Zhouping Wang
As an essential oil component, farnesol (Far) possesses biological activity. Nevertheless, its high hydrophobicity and volatility pose significant limitations to its practical application. Hydroxypropyl chitosan (HPCS) is a modified chitosan characterized by excellent solubility and a wealth of reactive groups. In this study, we used HPCS as the primary matrix to improve the stability and solubility of Far through chemical modification and physical loading. Subsequently, we comparatively analyzed the thermal stability, antioxidant activity and antibacterial activity of the two products. The derivatives (HPCS-Far-1–3) and nanoparticles (HPCS NPs, HPCS-Far NPs) were fabricated by bromide-mediated nucleophilic substitution and ionic gelation methods, respectively. The comparative analysis of these two derivatives presented potent antibacterial and antioxidant properties along with better solubility and thermal stability. This study is the first to compare the complex properties between chemical modification and physical loading, which offers valuable insight for the application of Far in different scenarios.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）