ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Shangqing Chen,Jiayin Hu,Yafei Guo,Nelson Belzile,Tianlong Deng
Developing effective adsorbents for 137 Cs removal from complex wastewater systems has been a significant challenge. Although existing spheres adsorbents could improve the post-separation ability and practical operability, the adsorption kinetics are still significantly retarded due to the large intra-particle diffusion resistance. Here, we demonstrate the efficiency of a robust Prussian blue analogue/polyvinyl chloride composite membrane (PPM), which was easily prepared by a simple solvent evaporation method. In virtue of the less dense layer and ion-sieving functionality, it showed enhanced kinetics (5 h) and super selectivity ( S F = 248.3–5388.6) towards Cs + . New PPM was robust within a wide pH range (2–10) and exhibited favorable removal capacity (152.8 mg/g), placing it at an outstanding material for Cs + removal among other adsorbents. Moreover, PPM could be simply eluted and reused using a KCl solution as eluent. A study of the adsorption mechanism confirmed an ion-exchange action during the removal process. Thus, PPM is considered to be a promising candidate for the removal of Cs + from multicomponent aqueous solutions
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NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 12
·6095-6102
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IF 3.159
Chengli Xie,Ling Xiao,Shanzhi Peng,Xiaowen Shi
Novel magnetic and fluorescent CS–Fe3O4@CdSeS nanoparticles (MF-CSNPs) were synthesized by incorporating Fe3O4–chitosan nanoparticles and mercaptopropionic acid capped alloyed CdSeS quantum dots into a chitosan matrix via an electrostatic interaction. The structure and properties of these novel MF-CSNPs were characterized by UV-visible, FL, XRD, ICP-AES, VSM and TEM. MF-CSNPs are found to adsorb copper ions with a high saturation adsorption capacity of 260 mg g−1, above 95.0 wt% of the copper ions can be enriched and removed from aqueous systems in minutes by manipulating the MF-CSNPs with an external magnetic field. The fluorescence signals of the MF-CSNPs could be quenched effectively by the adsorbed copper ions. Linear relationships are established between the relative fluorescence intensity of the MF-CSNPs and the concentration of copper ions. The linear range and limit of detection for copper ions depend on the concentration of MF-CSNPs. The linear range varies in the concentration range of 0.21–80 μg L−1 or 0.40–700 μg L−1, with the lowest limit of detection of 0.022 μg L−1 being calculated after enrichment. Trace copper ions in water can be simultaneously removed and determined using MF-CSNPs.
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Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 22
·4221-4232
·
IF 4.543
Yeying Wang,Xijian Liu,Guoying Deng,Qian Wang,Lijuan Zhang,Qiugen Wang,Jie Lu
In this work, multifunctional polystyrene@chitosan@gold nanoparticles–Fe3O4 nanoparticles–folic acid/indocyanine green (PS@CS@Au–Fe3O4–FA/ICG) nanocomposites that can integrate diagnosis and therapy into one nanoplatform was fabricated. The constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites possessed excellent computed tomography, magnetic resonance and fluorescence imaging performances which could be used to diagnose tumor and monitor the nanocomposites’ localization in vivo. Moreover, PS@CS@Au–Fe3O4–FA/ICG nanocomposites can be delivered in a targeted manner to cancer cells by folic acid in a receptor-mediated way, and tumor growth could be efficiently inhibited, even completely ablated, under NIR irradiation. That is, the constructed PS@CS@Au–Fe3O4–FA/ICG nanocomposites had great potential for computed tomography, magnetic resonance and fluorescence imaging performances, which could be used to diagnose tumors and to monitor local therapy and fluorescence imaging-guided targeted therapy of cancer cells using nanocomposites.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 24
·15072-15078
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IF 3.269
Lihua Wang,Huan Yang,Jiazi Hou,Wanxi Zhang,Chunhui Xiang,Lili Li
Core–shell structured cellulose acetate-polycaprolactone/chitosan (CA-PCL/CS) composite nanofibers were electrospun via coaxial electrospinning. Different solvents were used in core solutions, which led to different electrical conductivities in core solutions. The effect of the electrical conductivity on the morphology and structure of core–shell fibers was studied emphatically. As shown in the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, the increasing electrical conductivity of core solutions would result in smaller diameter ratios of core to shell, thinner overall diameters and more inhomogeneous diameter distributions. Additionally, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) all demonstrated that the interactions between cores and shells weakened with the increase of electrical conductivity of core solutions, and this might lead to different diameter ratios of cores to shells in the fibers. The results provide a basis for further design and optimization of processing conditions to control the nanostructure of core–shell composite nanofibers.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Shiyu Zhang,Yun Zou,Tengyou Wei,Chunxia Mu,Xiangjun Liu,Zhangfa Tong
The blended membranes of polyvinyl alcohol (PVA) and chitosan (CS) (PVA-CS) were prepared for pervaporation dehydration of a binary system of n -butyl acetate/water and a ternary mixture of n -butyl acetate/ n -butanol/water. Membranes were characterized by FTIR, DSC and XRD to investigate the intermolecular interactions, the blending compatibility and the effects of blending on crystallinity. Tensile strengths were measured to determine the influence of blending ratios on the membrane’s mechanical properties. The membrane’s degree of swelling in water dropped significantly with increasing CS fraction. The results agreed well with the calculation of the solubility parameter. Separation factor and permeation flux increased when the temperature was raised for both the binary and ternary pervaporation systems. An optimal separation factor of 27,000 with a total flux of 402 g·m −2 ·h −1 was obtained using the blend membrane containing 25 wt% CS at 40 °C for the binary system. For the ternary system, the maximum separation factor and total flux were obtained for blend membranes at 75 wt% and 50 wt% CS content, respectively.
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RSC Advances
·
2017
·Vol. 7
·期 8
·4572-4579
·
IF 3.108
Zepeng Kang,Kailong Jiao,Chao Yu,Ji Dong,Ruiyun Peng,Zongqian Hu,Shuqiang Jiao
Due to their unique physicochemical properties, carbon nanochips (CNCs) have been used for studies of the direct electrochemical and electrocatalytic properties of oxidoreductase. In this report, a glassy carbon electrode (GCE) was modified with CNCs, and glucose oxidase (GOx) was immobilized on the modified electrode surface. Chitosan (CS) was employed to fix the GOx/CNCs tightly to the surface of the GCE. Characterization of the modified electrode by SEM, TEM, and FT-IR showed that GOx remained in its native structure when immobilized in CNC film. The results of electrochemical impedance spectroscopy, cyclic voltammetry, and linear sweep voltammetry studies showed that direct electrochemical and bioelectrocatalytic activities of GOx were achieved and that the presence of CNCs enhanced the electrochemical response of GOx. Glucose had a linear current response from 0 to 1.9 mM, with a detection limit of 0.16 mM and an apparent Michaelis–Menten constant of 0.15 mM. The polarization curve of the biofuel cell revealed that the bioanode afforded an open circuit voltage of 0.59 V, maximum power density of 55 μW cm−2, and maximum current density of 434 μA cm−2. These results establish that the direct immobilization of protein onto the CNC surface can be used to achieve direct electron transfer of other redox enzymes. Furthermore, the findings provide a new perspective toward understanding the kinetics and thermodynamics of biological redox processes.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 30
·e55692
·
IF 2.7
Yang Meng,Mengke Shi,Wenbo Feng,Lingji Zhang,Hongzhong Zhang,Xiaojing Zhang
This study prepares a series of hollow-structured CS/SA/POSS composite gel spheres with a diameter of ~2.5 mm by using hydrophilic Janus-type polyhedral oligomeric silsesquioxane (AS-POSS) as a crosslinking agent in combination with sodium alginate and chitosan via electrostatic adsorption/free radical polymerization. As the content of POSS increases, the wall thickness of the gel spheres also increases from 20 to 30 μm, leading to a more compact and smooth wall structure in the polymerized CS/SA/POSS composite gel spheres. Additionally, the introduction and polymerization of POSS significantly enhance the stability, drug loading rate, and entrapment rate of the gel spheres, providing them with improved drug release capabilities. For hydrophilic drug doxorubicin, the loading rate and encapsulation rate reach 41.2% and 79.9%, respectively, while for the hydrophobic drug ibuprofen, they are 14.7% and 76.3%. Compared to some previously reported drug-loaded gel materials, the gels prepared in this study demonstrate relatively higher drug loading performance. Thus, these hollow-structured CS/SA/POSS composite gel spheres hold promise as innovative drug carriers in the biomedical field.
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ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Yuejin Liu,Xiaojun Niu,Dongqing Zhang,Lingling Zhou,Chunyang Tao,Yu Lin,Siping Chen,Yawen Chen,Zhang Lin,Suying Kong
Flocculation is one of the most significant conditioning methods for sludge dewatering. In the study, a novel flocculant CS–TA, prepared through free radical-mediated conjugation of tannic acid (TA) and chitosan (CS), was proposed to improve sludge dewatering. The characterisation using Fourier transform infra-red spectroscopy and X-ray diffraction analysis shows that the CS chain was the backbone of CS–TA, and the presence of CS–TA aromatic rings confirmed the conjugation of CS with TA. Moreover, the conditioning of CS–TA yielded the best dewatering performance at 30 mg g TS−1 with the water content of sludge cake by press filtration (Wsc) of 59.78% ± 0.3% and capillary suction time (CST) of 11.8s ± 0.35 s, compared to 98.2% ± 0.15% and 56.2 s ± 0.16 in raw sludge. The results of different influencing factors (e.g. pH and temperature) on flocculation efficiency indicated that CS–TA possessed the capacity for enhancing sludge dewaterability over a wide range of pH, and the optimal temperature was observed to be 35 °C. Furthermore, the increase of particle size and zeta potential implied the addition of CS–TA favoured the formation of larger particles charge neutralisation and adsorption bridging effect. In addition, extracellular polymer substances (EPS) analysis indicated that the decrease in the polysaccharide and protein contents in EPS after CS–TA addition could increase the relative hydrophobicity of sludge. Moreover, the contents of heavy metals in sludge and their leaching toxicity and environmental risk were reduced. This study provides comprehensive insights into the exploration of CS–TA for sludge dewatering and the maintenance of ecological security in an eco-friendly.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Hongxin Zhang,Xuegang Li,Xue Zhou,Yanan Zhang,Yong Zhao
Glycerol tributyrate as a low-density lipoprotein plays a crucial role in drug development and food safety. In this work, a novel high-stability fiber optic sensor for glyceryl tributyrate based on the poly(acrylic acid) (PAA) and chitosan (CS) composite hydrogel embedding method is first proposed. Compared with traditional functionalization, the lipase in a polymer network structure used in this article can not only avoid chemical reactions that cause damage to the enzyme structure but also avoid the instability of ionic bonds and physical adsorption. Therefore, the PAA/CS hydrogel method proposed in this article can effectively retain enzyme structure. First, the impact of different layers (one to five layers) of PAA/CS on pH sensing performance was explored, and it was determined that layers 1–3 could be used for subsequent sensing experiments. Within the linear detection range of 0.5–10 mM, the detection sensitivities of the one to three layers of the biosensor are divided into 0.65, 0.95, and 1.51 nm/mM, respectively, with the three layers having the best effect. When the number of coating layers is three, the detection limit of the sensor is 0.47 mM, meeting the millimole level detection standard for anticancer requirement. Furthermore, the stability and selectivity of the sensor (in the presence of hemoglobin, urea, cholesterol, acetylcholine, and glucose) were analyzed. The three-layer sensor is used for sample detection. At concentrations of 1–10 mM, the absolute value of the recovery percentage (%) is 82–99%, which can accurately detect samples. The sensor proposed in this paper has the advantages of low sample consumption, high sensitivity, simple structure, and label-free measurement. The enzyme-embedding method provides a new route for rapid and reliable glyceryl tributyrate detection, which has potential applications in food safety as well as the development of anticancer drugs.
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ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
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2024
·
IF 3
Ma Licheng,Qi Jungang,Gao Leqi,Wei Tao,Guo Yanhua
In this study, a cesium ion imprinted polymer (Cs(I)-IIP) was prepared by free radical thermal polymerization using 18-crown-6-ether (18C6) as ligand, methacrylic acid (MAA) as functional monomer, and ethylene glycol dimethacrylate (EGDMA) as crosslinking agent, which can be used for adsorption and separation of cesium ions from low-concentration solutions. The adsorption kinetic and isotherm results showed that the adsorption of Cs + fitted to the pseudo-second-order kinetic model and Langmuir model, indicating that the adsorption of Cs + on Cs(I)-IIP was the monolayer chemical adsorption. The maximum adsorption capacity was 84.21 mg·g − 1 . The selective adsorption properties are performed in Cs + , Li + , Na + , and K + multicomponent systems. The results showed that the Cs(I)-IIP has a high selectivity in the presence of coexisting Li + , Na + , and K + , and the selectivity coefficients ( K’ ) of Cs(I)-IIP for Cs + /Li + , Cs + /Na + , Cs + /K + are 2.1, 1.56, and 1.33, respectively. The high adsorption capacity and selectivity are attributed to the introduction of imprinting technology to form specific Cs + recognition adsorption sites, and the 18C6 cavity was easier to recognize Cs + in the competitive adsorption process. Finally, the Cs(I)-IIP can be regenerated and reused for 10 times with the adsorption capacity only decreased by 8.1%, indicating that the polymer has good reuse performance.
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ACS Applied Bio Materials
·
2024
·
IF 4.6
Jihao Zuo,Ruopeng Lan,Ningning Lv,Yitong Lin,Li Hao,Xinhua Zhou,Hongjun Zhou
Pathogens and pests pose significant threats to global crop productivity and plant immunity, necessitating urgent measures from researchers to prevent pathogen contamination and pest damage to crops. A natural plant-based antibacterial agent, eugenol (EUG), has demonstrated excellent antimicrobial and insect repellent capabilities, but the characteristics of volatilization and poor dissolution limit the practical application. The nanoization of pesticide formulations holds promise in the development of highly effective pesticides for antibacterial and insecticidal purposes. Herein, a eugenol-loaded nano delivery system (EUG@CMC-PGMA-CS) was synthesized using glycidyl methacrylate (GMA) as a functional monomer to connect carrier core structure carboxymethyl cellulose (CMC) with shell structure chitosan (CS), and EUG was encapsulated within the carrier. EUG@CMC-PGMA-CS demonstrated excellent leaf affinity, with minimum contact angles (CAs) of 37.83 and 70.52° on hydrophilic and hydrophobic vegetable leaf surfaces, respectively. Moreover, the maximum liquid holding capacity (LHC) of EUG@CMC-PGMA-CS on both hydrophilic and hydrophobic vegetable leaf surfaces demonstrates a noteworthy 55.24% enhancement compared to the LHC of pure EUG. The in vitro release curve of EUG@CMC-PGMA-CS exhibited an initial burst followed by stable sustained release. It is with satisfaction that the nano delivery system demonstrated exceptional antibacterial properties against S. aureus and satisfactory insecticidal efficacy against Spodoptera litura. The development of this eugenol-loaded nano delivery system holds significant potential for enhanced antibacterial and insect repellents in agriculture, paving the way for the application of volatile bioactive substances.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ran Ran,Wei Zhu,Guoliang Zhang,Lei Wang,Gongying Wang,Jie Li
The loaded acid–base bifunctional catalysts exhibit good catalytic performance in the synthesis of methyl methacrylate via aldol condensation of methyl propionate with formaldehyde, but they still suffer from deactivation caused by coke deposition. In this paper, coke deposition as well as consequential deactivation behavior of Cs/SiO2 catalyst loaded with various amounts of Al was investigated under different reactant compositions by using nuclear magnetic resonance, thermogravimetric, Brunauer–Emmett–Teller, and Raman analysis. As a result, coke on the catalyst was characterized by amorphous coke deposition, which was mainly composed of polycyclic aromatic hydrocarbons and aliphatic substances. Al added to the 10Cs/SiO2 catalyst significantly reduced the amount of coke deposition and inhibited the C/H ratio of coke. Appropriate amounts of Al and reactant compositions could ultimately increase the stability of the catalyst. Moreover, the kinetics of coke deposition observed on the Al–Cs/SiO2 catalyst was studied. It was found that the Voorhies equation modified using the variables of reaction temperature and reactants composition could accurately forecast coke accumulation on the 3.5Al-10Cs/SiO2 catalyst under specific conditions.
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