JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 23
·10168-10184
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IF 3.553
Ye Zhishuang,Li Li,Zhao Fang,Yang Qingsong,Wang Yunwei,Bohinc Klemen,Guo Xuhong
A novel ratiometric fluorescent probe for Cu 2+ was fabricated in spherical polyelectrolyte brush (SPB) where the red-emission europium complex Eu(TTA) 3 Phen was embedded in the polystyrene (PS) core to generate the reference signal and the green-emission glutathione-capped CdTe quantum dot was immobilized onto the poly(styrene sulfonate) brush shell to provide the sensing signal.
Results indicate that this probe has high sensitivity and selectivity for Cu 2+ over other metal ions. The addition of Cu 2+ could greatly quench the probe’s fluorescence at 550 nm, while the fluorescence signal at 614 nm kept unchanged. Under the optimized conditions, the intensity ratio of the two fluorescence emissions showed a linear response range from 0 to 1000 nM with a limit of detection of 1.45 nM for Cu 2+ . The probe is very suitable for the detection of copper contamination with quick response, low cost and great stability. SPB was proved to be an excellent “carrier” for building high-quality ratiometric probes due to its special core–shell structure and outstanding ability to enrich counterions. This work provides a versatile method for the development of high-quality ratiometric fluorescent probes, which can be extended to potential applications in various fields, such as environmental monitoring, biological imaging, pathological analysis and cancer diagnosis.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2020
·Vol. 35
·期 1
·99-106
·
IF 0.64
Su Junzhang,Wu Xiangfeng,Zhang Chenxu,Wang Hui,Zhang Mi,Zhang Jiarui,Jia Yunning,Cui Yanan,Tong Xin,Shang Jialu,Zhang Chenyu
The CdS/ spherical g-C 3 N 4 n-n heterojunction photocatalyst was fabricated via a solvothermal method. The tetracycline was used to characterize the photocatalytic properties of the as-developed hybrids. The photocatalytic degradation mechanism of the as-developed heterojunction photocatalyst was also analyzed. Research results show that CdS nanoparticles are well dispersed in the surface layer of spherical g-C 3 N 4 . Moreover, the mass ratio of CdS to spherical g-C 3 N 4 will influence the photocatalytic activity of the asdeveloped composites, which shows the trend of first increasing and then decreasing as it increased. When the mass ratio is 7:1, in 25 min, the as-developed heterojunction shows 93.2 % of the maximum photocatalytic efficiency and still exhibits 83.6 % after 5 times cycle testing. Moreover, the as-developed hybrids can accelerate the electron transport and improve the separation efficiency of photo-generated carriers compared with pure samples. In addition, the holes and superoxide radicals are dominating active species during the photocatalytic degradation process.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Chen Huayao,Chen Lishen,Shen Zhichuan,Zhou Hongjun,Hao Li,Xu Hua,Zhou Xinhua
Salicylaldimine, furfuralimine and benzaldehyde imine were adopted to modify mesoporous silica (MCM) respectively denoted as Sal-MCM, Fur-MCM and Ben-MCM before loading methyl eugenol (Me) for pesticide delivery. Me was adsorbed by Schiff base mesoporous silica without destructing regular hexagonal pore structure verified by the characterization results. DSC result implied that Me in amorphous state which was distributed in the pores of the mesoporous silica. The loading content of Me-Sal-MCM, Me-Fur-MCM and Me-Ben-MCM 67.89%, 73.34% and 73.84% which was higher than Me-MCM without modification (67.35%).Because the electrostatic interaction and π-π interaction between Schiff base and Me strengthened the adsorption capacity of the carrier. And the electrostatic interaction played a more important role in interaction between Me and Schiff base modified mesoporous silica. As a result, Schiff base modified sustained release system also has significantly longer sustained release time with a sequence of Me-Sal-MCM > Me-Ben-MCM > Me-Fur-MCM in release speed in negative correlation with the electric potential sequence. The behaviors of their sustained release performance can be fitted by First order kinetic model before Schiff base modification. After modification, their sustained release behaviors were consistent with Korsmeyer-Peppas equation with non-Fickian diffusion mechanism indicating that main impact on the release process after modification was no longer mainly controlled by the difference of the concentration. Finally, the highest lure rate of the modified MCM (Me-Fur-MCM) equals to the 73% of the pure Me due to its highest BET surface area and strongest interaction with Me among the three Schiff base modified samples. Therefore, the environment-friendly slow-release bio pesticide with long service life was prepared to reduce the damage on the environment caused by pesticide.
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IONICS
·
2020
·Vol. 26
·期 7
·3267-3274
·
IF 2.394
Guo Binbin,Ananth K. Prem,Zhang Jingshi,Ji Xinzhu,Bai Jiaming
In this work, sulfur-doped graphene nanosheets (SGNS) were fabricated by wet ball milling pristine graphite with carbon disulfide (CS 2 ). With the presence of liquid CS 2 , pristine graphite was easily infiltrated and exfoliated to graphene nanosheets, and sulfur atom was successfully doped onto the surface of graphene nanosheets. The as-prepared SGNS with sulfur doping content (12.49 wt.%) showed higher reversible specific capacity (588.2 mAh g −1 and 266.2 mAh g −1 ) than the commercial graphite (240 mAh g −1 and 69.7 mAh g −1 ) at current densities of 100 and 1000 mA g −1 , respectively. This method described in this study can provide a simple and low-cost strategy for the preparation of SGNS as a promising anode material for lithium-ion batteries.
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CATALYSIS LETTERS
·
2020
·Vol. 150
·期 8
·2437-2445
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IF 2.482
Yang Zhi,Luo Mingsheng,Liu Qinglong,Shi Buchang
A potassium- and copper-modified iron-based catalyst (K–Cu–Fe/SiO 2 ) was synthesized by the co-precipitated method. The general structural properties of the catalyst were characterized with various techniques, including SEM, XRD, H 2 -TPR, N 2 adsorption–desorption and Raman spectroscopy. The results reveal that the fresh catalyst is mainly composed of α-Fe 2 O 3 phase with rod-shaped morphology formed by nanoparticles. The effect of activation process on the Fischer–Tropsch synthesis catalytic performance was then investigated. It shows that activation process has an important influence on the reactive stability. The in situ XRD and in situ Raman spectroscopy were used to study the structural changes of the Fe-based catalyst during reduction and reaction processes. The Fe 2 C iron carbide as the main active phase was observed after reduction process. Graphic Abstract
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CELLULOSE
·
2020
·Vol. 27
·期 13
·7677-7689
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IF 4.21
Zhuo Longhai,Ma Cong,Xie Fan,Chen Shanshan,Lu Zhaoqing
Polyimide (PI) aerogels have great potential in oil/water separation field, but the extreme volume shrinkage during the fabrication still remains challenging. Herein, a simple yet efficient strategy of incorporating methylcellulose (MC) in PI aerogels is proposed. The MC/PI composite aerogels were fabricated by freeze-drying plus thermal imidization with subsequent trimethylchlorosilane (TMCS) functionalization. The results revealed that MC entered the skeleton of aerogels and strengthened it effectively by promoting the formation of robust and complete 3D porous structure, and the defects of as-prepared aerogels were eliminated when the proportion of MC was beyond 10 wt%. After modification with TMCS, the water contact angle of aerogels increased significantly by 30°–40°, and the functionalized aerogels showed excellent oil absorption capacity up to 28.44 g/g. The outstanding oil absorbency and simple process for separating oil and water with MC/PI composite aerogels are promising candidates in the field of oil/water separation.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 22
·5477-5487
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IF 3.637
Wu Keyan,Feng Yun,Li Yusheng,Li Li,Liu Rui,Zhu Liande
This article presents a novel peroxidase mimetic by doping S atoms into reduced graphene oxide (rGO), which was synthesized through a facile hydrothermal reaction without any templates or surfactants. The peroxidase-like activity of S-doped rGO (S-rGO) is greatly boosted compared with the pristine rGO, demonstrating the peroxidase-like active sites are dominantly originated in sulfur-containing groups. The steady-state kinetic studies further indicate that S-rGO obeys the typical Michaelis-Menten curves and has a much smaller Michaelis constant ( K m ) for hydrogen peroxide (H 2 O 2 ) and 3, 3′, 5, 5′-tetramethylbenzidine (TMB). In view of the outstanding performance of S-rGO as a peroxidase mimetic, an efficient and sensitive colorimetric detection platform for H 2 O 2 and glucose has been successfully established. The linear detection for H 2 O 2 is obtained in a range of 0.1–1 μM with an extremely lower detection limit of 0.042 μM, and glucose can be measured in a linear range of 1–100 μM, giving a detection limit of 0.38 μM. This study not only provides a new avenue for the reasonable design of heteroatom-doped carbon-based nanomaterials but also offers meaningful reference for detecting the important biomolecules in biotechnology.
Graphical abstract
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JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
·
2020
·Vol. 58
·期 2
·532-540
·
IF 1.946
Xing Li,Miao Yelian,Li Na,Jiang Ling,Chen Jie Yu
One water-soluble polysaccharide (WDOP) and three alkali-soluble polysaccharides (ADOP1, ADOP2 and ADOP3) were successfully obtained from Dendrobium officinale . Molecular structure of the polysaccharides was analyzed, and in vitro lactic acid fermentation of the polysaccharides by lactic acid bacteria (LAB) and bifidobacteria was performed. All the polysaccharides exerted proliferative effect on the LAB and bifidobacteria. ADOP2 was the most effective one, followed by WDOP. This could be attributed to their molecular structure features, such as a high level of total sugar, uronic acid and reducing sugar, an abundance of glucose and mannose, and a low and middle weight-average molecular weight. ADOP2 and WDOP produced more short-chain fatty acids (SCFAs) than ADOP1 and ADOP3 did during lactic acid fermentation. Propionic and acetic acids were the main SCFAs produced. These findings are useful for understanding the structure–activity relationship of D. officinale polysaccharides in lactic acid fermentation, and for developing new functional foods and beverages from D. officinale .
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Chen Shangqing,Hu Jiayin,Guo Yafei,Deng Tianlong
In this work, a series of polyphenol porous polymers were derived from biomass polyphenols via a facile azo-coupling method. The structure and morphologies of the polymer were characterized by BET, TEM, SEM, XRD, TGA and FT-IR techniques. Batch experiments demonstrated their potentialities for adsorptive separation of Cs + from aqueous solution. Among them, porous polymers prepared with gallic acid as starting material (GAPP) could adsorb Cs + at wide pH value range effectively, and the optimal adsorption capacity was up to 163.6 mg/g, placing it at top material for Cs + adsorption. GAPP exhibited significantly high adsorption performance toward Cs + compared to Na + and K + , making it possible in selective removal of Cs + from ground water in presence of co-existing competitive ions. Moreover, the Cs-laden GAPP could be facilely eluted and reused in consecutive adsorption-desorption processes. As a result, we hope this work could provide ideas about the potential utilization of biomass polyphenol in environmental remediation.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10482-10491
·
IF 3.553
She Tiantian,Niu Libo,Nie Shilin,Li Huafan,Qiao Xianliang,Ma Yuanyuan,Han Xue,Chen Guofeng,Bai Guoyi
A novel sodium alginate-based Pd-3D double network hydrogel Pd/Ca–Alg–PAAS has been fabricated and successfully applied in the selective hydrogenation of phenol for the first time. The prepared catalyst showed excellent catalytic activity and high selectivity (99.8%) for cyclohexanone in the selective hydrogenation of phenol. Furthermore, this double network hydrogel of Pd/Ca–Alg–PAAS still kept a conversion of over 80% with the selectivity for cyclohexanone being over 99% after 6 runs, superior to the single network hydrogel of Pd/Ca–Alg. TEM and FT-IR results demonstrated that the Pd species were highly dispersed in Pd/Ca–Alg–PAAS, and the addition of sodium polyacrylate could enhance the interaction between hydrogel and Pd 2+ and thus inhibit the agglomeration and loss of the active Pd species, accounting for the good stability of Pd/Ca–Alg–PAAS.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 22
·28396-28407
·
IF 3.056
Hu Guangzhuang,Zhang Wei,Chen Yuantao,Xu Cheng,Liu Rong,Han Zhen
With the development of the boron industry, boron pollution is getting more and more serious, and excessive boron will harm human health. In this paper, graphene oxide was used as a template to prepare ZIF-67, and GO/ZIF-67 was successfully prepared. GO/ZIF-67 was used for the first time to remove boron from water. SEM, XRD, and other characterization methods were used to confirm the structure. The adsorption kinetics, adsorption isotherm, adsorption thermodynamics, and adsorption mechanism of boron by GO/ZIF-67 were studied in this paper. The adsorption capacity of GO/ZIF-67 for boron is up to 66.65 mg·g −1 at 25 °C, and adsorption process reaches equilibrium in 400 min. Adsorption kinetics indicates that the adsorption process conforms to the pseudo-first-order kinetic model, and adsorption thermodynamics indicates that the adsorption process is a spontaneous endothermic process controlled by entropy change. The adsorption capacity of boron by GO/ZIF-67 does not decrease significantly after four cycles. The adsorption of boron by GO/ZIF-67 has both chemical and physical adsorption. From Zeta potential and adsorption kinetics, it can be seen that there is physical adsorption during the adsorption process and boron mainly has positive charge on the surface of GO/ZIF-67 and graphene oxide hydroxyl bonding. Based on the adsorption thermodynamics and XPS, it is known that there is chemisorption during the adsorption process, and mainly the combination of boron and cobalt sites.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-10
·
IF 6.232
Zhang Lihui,Liu Candi,Wang Qiwen,Wang Xiaohong,Wang Shengtian
Two-dimensional porous graphitic carbon nitride (g-C 3 N 4 ) nanosheets were synthesized by low-cost and direct thermal oxidation. Porous g-C 3 N 4 assembled with graphene oxide (GO) was immobilized on a glassy carbon electrode. The sensor was applied to simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) with high performance. Cyclic voltammetry and differential pulse voltammetry were used to investigate electrochemical and electrocatalytic properties. The results indicate that the electrochemical sensor possesses high specific surface area, hierarchical pore structure and excellent signal response to AA, DA and UA. The oxidation potentials are well separated at around 0.15, 0.34 and 0.46 V for AA, DA and UA respectively. The determination limits for AA, DA and UA are 3.7 μM, 0.07 μM and 0.43 μM, respectively. The sensor was applied to tracking the three analytes in spiked serum samples with recovery 95.1~105.5% and relation standard deviations of less than 5%.
Schematic representation of porous graphitic carbon nitride nanosheet embedded in graphene oxide for simultaneous determination of ascorbic acid, dopamine and uric acid.
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