ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 39
·51237-51252
·
IF 0
Wang Tongtong,Husein Dalal Z.,Guo Siyan,Zhang Xinle,Kang Jiarui,Wang Huixia,Cao Shumiao,Shangguan Zhonghua,Shi Hui
Resource utilization of waste masks has become an urgent scientific issue. In this work, with sustainably, waste masks and biomass were co-pyrolysis with oxygen limitation to prepare mask-based biochar (MB). Then, urea was introduced to prepare novel nitrogen modified mask-based biochar (NMB) via a one-step hydrothermal synthesis method. The adsorption characteristics of NMB on the emerging environmental pollutant, bisphenol A (BPA), were evaluated via batch adsorption tests. Moreover, the physicochemical properties of the materials were characterized with various advanced techniques. Also, the roles of waste masks and nitrogen modification were explored. The adsorption mechanisms of NMB on BPA were revealed as well as the performance differences between different adsorbents. The results showed that waste masks participated in thermochemical reactions, shaped the microsphere structure of biochar, and increased the types of surface functional groups. The nitrogen modification enriched the surface elemental composition and activated the specific surface area via the mesopore. These would enhance the adsorption performance. The maximum adsorption of BPA by NMB was 62.63 mg·g −1 , which was approximately 2.35–5.58 times higher than that of the control materials. Temkin model and pseudo-second-order model optimally simulate the isothermal and kinetic adsorption, respectively. The adsorption mechanisms are jointly by physical and chemical adsorption, which mainly includes π–π interaction, hydrogen bonding, intraparticle diffusion, surface adsorption, and ion exchange. After discussion and evaluation, NMB has lower preparation process cost (7.21 USD·kg −1 ) and safety, with potential for environmental applications. This study aims to expand new ideas for the comprehensive utilization of waste masks and the preparation of eco-friendly materials. Moreover, it provides a theoretical basis for the removal of BPA.
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CHROMATOGRAPHIA
·
2011
·Vol. 75
·期 1
·71-76
·
IF 1.075
Yang Xiujuan,Feng Jun,Chen Zuanguang,Liao Rifang,Li Xinchun
A novel, rapid and validated capillary electrophoretic method with an improved electromagnetic induction detector has been developed for the determination of ibuprofen, acetaminophen, amantadine hydrochloride, aminopyrine, diclofenac sodium and codeine phosphate in three kinds of analgesic pharmaceutical preparations. Fabrication of the electromagnetic inductor was the same as previously described, but a brand new electric circuit was designed for the detector to lower the background noise and improve the detection sensitivity. Important factors which might influence the response of the detector, including the value of the adjustable inductor and resistor, excitation frequency and voltage, were examined. Electrophoretic parameters affecting separation efficiency, such as variety of buffer, buffer pH, buffer concentration and electroosmotic flow modifier, were also deliberately investigated. Under the optimal conditions, highly linear response was obtained for these six compounds over three orders of magnitude with detection limits ranging from 0.1 to 1.0 μg mL −1 (S/N = 3). The average recovery and RSD were within the range of 97.5–101.5 and 1.1–2.3%, respectively. This simple, convenient, effective and stable method held great promise in quality control of pharmaceutical preparations.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-9
·
IF 5.3
Shao Tong,Yang Dou,Wang Xiaoshuang,Wang Ruirui,Yue Qiaoli
A novel portable cotton swab based on nitrogen-doped carbon dots (NCDs) for Al 3+ detection was constructed for the first time. NCDs with bright green fluorescence were prepared by hydrothermal method with phenylhydrazine hydrochloride and 3-hydroxy-2-naphthoic acid hydrazide as precursors. The surface of NCDs was exposed to abundant functional groups (such as amino, carboxyl, hydroxyl, etc.), which was helpful for the formation of complexes between NCDs and Al 3+ . In the presence of Al 3+ , the aggregation of NCDs obviously induced their fluorescence enhancement due to the aggregation-induced emission (AIE) of NCDs. Furthermore, the quantum yield (QY) of NCDs was enhanced by 12 times with Al 3+ , and the fluorescence lifetime was increased by 7.54 ns. The fluorescence intensity was linearly correlated with the concentration of Al 3+ (2.5–300 μM), and the limit of detection was 0.76 μM. Moreover, for the portable way, cotton swabs were successfully employed to construct the sensors for the detection of Al 3+ in food samples. This proposal has potential for the application in food analysis. Graphical
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高影响因子
POLYMER BULLETIN
·
2011
·Vol. 68
·期 3
·729-743
·
IF 1.215
Han Wensong,Lin Baoping,Zhou Yidan,Song Jiangang
The hyperbranched polyurethane acrylate oligomers containing photoinitiator were synthesized by modifying the second-generation hyperbranched poly(amine-ester) with isophorone diisocyanate-2-hydroxyethylacrylate and isophorone diisocyanate-2-hydroxy-2-methylpropiophenone at different feed ratio. The elemental analysis, FT-IR and NMR methods are used for structural characterization, molecular weights, and polydispersities, photosensitive groups and thermal properties of the oligomers were analyzed by gel permeation chromatography, UV–Vis spectra and thermogravimetric analysis, respectively. UV-curing properties were characterized by FT-IR at different curing time. In addition, the solubilities of the oligomers were also examined.
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CELLULOSE
·
2025
·
IF 4.8
Yao Qing,Zhang Bing,Jin Yongkang,Cai Zaisheng,Xu Bi
Developing fluorine-free, bio-based, and mechanically robust water repellent coating is attractive for the textile industry, yet remains challenging. In this work, we reported a bio-based urethane prepared in one step by utilizing the nucleophilic addition reaction between sorbitan tristearate and isophorone diisocyanate. The obtained urethane was subsequently emulsified and applied onto three types of fabrics including cotton, polyester pongee, and nylon taffeta through a simple dip-pad-cure process, to produce durable superhydrophobic coatings. Both the resulting cotton fabrics and polyester fabrics exhibit static water contact angles above 150° and a grade of 5 in the water spray test, while the nylon fabrics own a water contact angle of 147° and a grade of 4 in the water spray test. All the fabrics maintained excellent air permeability. Besides, the treated fabrics maintain hydrophobicity after harsh durability tests, including 3000 cycles of friction, 400 cycles of sandpaper abrasion, and 70 h of chemical corrosion. Overall, the findings presented in this study offer valuable insights into the development of non-fluorine durable bio-based water repellents, highlighting their potential for diverse industrial applications. Graphical abstract
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Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Liu Wangyu,Tan Zhenhua,Xie Weigui
With the continuous growth of tomato yields and the need to address the cumbersome task of manual harvesting, the development of harvesting robots presents a promising solution for tomato harvesting. A key challenge lies in improving the success rate of these robots for reliable tomato harvesting without causing damage. This study aims to propose a rigid-flexible coupled gripper to ensure higher success rates in tomato harvesting, while also incorporating an advanced method for detecting fruit ripeness. The paper introduces a flexible hydrogel pressure sensor, featuring a wide detection range, high sensitivity, and excellent stability, integrated into the gripper design. A signal acquisition system based on a sensor array is developed, enabling the accurate capture of force signals during the tomato grasping process. The sensor array collects tactile sequence data in real-time, which, when combined with compressive deformation data from the fruit, forms a comprehensive dataset. To detect tomato ripeness, four classification models—Long Short-Term Memory (LSTM), Convolutional Neural Networks (CNN), Multi-Layer Perceptron (MLP), and Fully Convolutional Networks (FCN)—are implemented. Among the four models, the LSTM network achieves the highest classification performance. The overall recognition accuracy for tomatoes of different ripeness levels, within the same variety and at room temperature, is determined to be 99%. The results demonstrate that the combination of a flexible gripper with hydrogel sensors not only preserves the integrity of the tomatoes but also ensures accurate detection of fruit ripeness. This innovation has the potential to significantly enhance the performance of tomato harvesting robots, contributing to more efficient and automated agricultural practices.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-15
·
IF 3.9
Feng Liujun,Chen Zhiqiang,Wang Haiyan,Chen Zhibiao,Chen Zuliang,Liu Jianhua,Zeng Yuee
Phytoremediation is currently a very popular remediation method for salvaging rare earth mining sites. However, there is still a challenge concerning how to use secondary resources such as plant biomass following the extraction of rare earth elements (REEs). Herein, Dicranopteris pedata (Houtt.) Nakaike, a REEs hyperaccumulator, served to fabricate REEs-rich carbonisation materials (REEs/C) at different temperatures. The results showed that the percentages of Pb(II) removed using REEs/C prepared at 400 °C (REEs/C-4) and 800 °C (REEs/C-8) were 85.1% and 84.0%, respectively. These amounts were better than that of REEs-C prepared at 600 °C (REEs/C-6 (67.0%)). Characterisation analysis confirmed that rich functional groups like aromatic, hydroxyl and C = C/C-C in REEs/C-4 provided more chelation sites to effectively complex with Pb(II), while the superior removal capacity of REEs/C-8 resulted from the enrichment of more REEs and abundant pore structure. Chemisorption, such as ion exchange and chelation, plays a significant role in adsorption. During the carbonisation process of REEs/C, the REEs enriched in Dicranopteris pedata contributed to the formation of rare earth oxides and oxygen vacancies in the material, and these properties enhanced the Pb removal ability of REEs/C. Moreover, the REEs contained in the material did not cause a leaching phenomenon during Pb removal, which is a safe and environmentally friendly material. Finally, the REEs/C was applied to wastewater, and it was found that this material could effectively adsorb Pb from wastewater. Overall, this study generates a new insight into: firstly, how to use phytoextracted biomass containing REEs as valuable REEs/C materials; and secondly, how to save the environment by using technology that promotes recycling of used materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 23
·34159-34169
·
IF 0
Cao Yu,Zhong Zehui,Zeng Fanqi,Zhou Yang
To ensure the safety of food contact materials, a liquid chromatography method was established to determine the migration of formaldehyde in paper packaging with various food simulants (10%, 25%, 50%, 75%, and 95% ethanol by volume) and to investigate the migration behavior of formaldehyde after various durations and with various materials. The results showed that the method has good linearity with a correlation coefficient of R 2 > 0.9990, a detection limit of 0.0011 ~ 0.0027 mg L −1 , and a spiked recovery of 89.7 ~ 103.2% in the range of formaldehyde determination; the migration of formaldehyde in all six paper contact materials showed a trend of gradual increase with time until equilibrium was reached. At the same time and temperature, the migration of formaldehyde in paper packaging was the highest in low-concentration ethanol. With the same food simulants and materials, the maximum migration of formaldehyde in printed materials was greater than that in nonprinted materials; with different materials and the same food simulant, the thickness value was higher, with the use of water-based ink as a printing material, and the maximum migration value of formaldehyde by offset printing technology was low.
CAS / MDL:
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Nano Research
·
2017
·Vol. 11
·期 1
·195-205
·
IF 7.354
Mei Xuan,Xu Simin,Hu Tongyang,Peng Liuqi,Gao Rui,Liang Ruizheng,Wei Min,Evans David G.,Duan Xue
Two-dimensional (2D) nanomaterials have gained tremendous attention in the field of biomedicine because of their high specific surface areas and fascinating physicochemical properties. Herein, 2D monolayered double hydroxide (MLDH) nanosheets were employed to localize doxorubicin (DOX), an anticancer drug, with a loading capacity of as high as 3.6 mg·mg –1 ( w / w ). Structural characterizations and theoretical calculations indicate that the DOX molecule is uniformly arranged and oriented at the surface of the MLDHs with a binding energy of 15.90 eV, showing significant electrostatic interaction. With the assistance of the targeting agent folic acid (FA), DOX-FA/MLDHs demonstrate targeted cellular uptake and superior anticancer behavior based on in vitro tests performed with cancer cells. In addition, this composite material exhibits a selective release toward cancer cells and good biocompatibility with normal cells, which would guarantee its practical applications in cancer therapy.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 7
·1296-1303
·
IF 1.113
Zhang Bin,Jiang Yujie,Han Jian
A flexible and stretchable three-dimensional nanocomposite membrane based on traditional cotton fabric is a promising alternative for proton exchange membrane because it has the capability of transferring protons, is inexpensive, and also have higher current density compared to Nafion membranes in microbial fuel cells. The obtained results showed that the highest power and current of PVAc-g-PVDF-coated cotton fabric were 400±10 mW/m 2 and 92 mA/m 2 , respectively. However, maximum generated power and current for Nafion-117 were 300±10 mW/m 2 and 60 mA/m 2 , respectively. The highest proton conductivity of PVAc-g-PVDF-coated cotton fabric was (1.5±0.2)×10 -2 S/cm at 25 °C and lowest glucose permeability was (12±1)×10 -6 cm 2 /s after Mg 2+ ions adsorption. Furthermore, the highest COD removal (85±3 %) and CE (11.2 %) were obtained from PVAc-g-PVDF-coated cotton fabric. The coated cotton fabric can provide a novel route for low-cost production of high-performance flexible proton exchange materials from the natural fabrics.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 9
·5011-5024
·
IF 1.369
Zhang Nannan,Li Liping,Li Guangshe
Abstract A facile synthetic route for the preparation of highly active tantalum oxide photocatalysts was developed without using any surfactants. The prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectra, thermogravimetric analysis, and Raman, and their activity was evaluated by photocatalytic H 2 evolution under UV–Vis light irradiation (320 < λ < 780 nm). To elucidate the photocatalytic activity, the nitrogen adsorption–desorption isotherms experiment, ultraviolet–visible diffuse reflectance spectra, photoluminescence and steady-state surface photo-voltage measurements were performed. The recyclable photocatalytic properties were also conducted to demonstrate its high stability. Notably, the obtained samples prepared by direct evaporation are amorphous and own a large specific surface area, and furthermore exhibit a far greater photocatalytic performance than commercial Ta 2 O 5 . On the basis of the above experiment results, the enhanced photocatalytic activity of a -Ta
x
O
y
could be ascribed to the efficient separation and migration of photo-generated carriers as well as the higher energy of the conduction band minimum. Therefore, the direct evaporation synthesis opens a door to the facile preparation of highly active amorphous photocatalysts. Graphical Abstract
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 83
·期 2
·308-314
·
IF 1.575
Wang Li,Li Yanhong,Shi Min,Ma Wenle,Cui Hongtao
Abstract In this work, nanosphere-like and nanowire shaped CeO 2 nanocrystals were prepared at room temperature utilizing the epoxide precipitation reaction in aqueous and ethanolic solutions. It was found that the shape of CeO 2 nanocrystals depends on the reaction kinetics of epoxide in solution. The isotropic growth of nanocrystals in aqueous solution resulted in the formation of CeO 2 nanocrystals with sphere-like shape, while the anisotropic growth of nanocrystals in ethanolic solution led to the nanowire shape of CeO 2 nanocrystals. The anisotropic growth of nanocrystals was attributed to the high surface energy of their {110} facet induced from the active reaction of epoxide in ethanolic solution. The reaction kinetics of epoxide affected not only the size and crystallinity of CeO 2 nanocrystals, but also their shape. As a result, the produced CeO 2 nanocrystals had different electrochemical performance. As an electrode material for application in supercapacitor, the nanosphere-like CeO 2 nanocrystals presented better electrochemical performance and longer cycle life than the packed CeO 2 nanowires. Graphical Abstract Nanosphere-like and nanowire shaped CeO2 nanocrystals were prepared utilizing the epoxide precipitation reaction in aqueous and ethanolic solutions. It was found that the shape of CeO2 nanocrystals depends on the reaction kinetics of epoxide in solution. The isotropic growth of nanocrystals in aqueous solution produced CeO2 nanocrystals with sphere-like shape, while the anisotropic growth of nanocrystals in ethanolic solution produced nanowire shaped CeO 2 . As an electrode material for application in supercapacitor, the nanosphere-like CeO 2 nanocrystals presented better electrochemical performance and longer cycle life than the packed CeO 2 nanowires.
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危险品化学品经营许可证（带存储）