Journal of Coatings Technology and Research
·
2019
·Vol. 17
·期 1
·171-180
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IF 1.584
Li Jing,Shan Wenwen,Cui Jincan,Qiu Hanxun,Yang Guangzhi,Zheng Shiyou,Yang Junhe
Polyetheramine (D230), an epoxy curing agent, was grafted on graphene oxide (GO) surfaces, which can be stably dispersed in a waterborne curing agent for more than 8 months. Waterborne epoxy coatings reinforced by D230-functionalized GO (DGO) were prepared on carbon steel surfaces. According to the electrochemical impedance spectra, the impedance modulus at 0.1 Hz remained at 2.2 × 10 9 Ω after 150 days of immersion in 3.5% NaCl electrolytes for 0.2 wt% DGO-reinforced waterborne epoxy coatings, while that of the neat epoxy coatings dropped below 1 × 10 7 Ω after 10 days. Besides, the addition of DGO enhanced the weathering resistance of waterborne epoxy coatings. After 60 days of the UV aging test, the yellow color index of neat epoxy coatings was 1.6 times that of 0.5 wt% DGO/epoxy coatings. The residual pencil hardness of the 0.5 wt% DGO/epoxy coatings was three levels higher than that of neat epoxy coatings.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 6
·1-14
·
IF 1.784
Chen Gang,Fan Tao,Yang Hongqi,Fu Chunlin,Gao Rongli,Deng Xiaolin,Wang Zhenhua,Fan Peigeng,Cai Wei
(1 − x )BaTiO 3 – x BiAlO 3 relaxor ferroelectric ceramics were prepared by the conventional sintering (CS) and the microwave sintering (MWS) methods, respectively. The microstructure, the dielectric properties, the relaxation characteristic, the ferroelectric and the energy storage properties were investigated in detail. The results show that a single perovskite phase exists in ceramic samples sintered by CS and MWS. The addition of BiAlO 3 into BaTiO 3 and the MWS method result in the reduction of the grain size and the porosity of BaTiO 3 ceramic. This leads to the enhanced diffuse transition and frequency dispersion. The dielectric constant and loss decrease with increasing the BiAlO 3 content, and the temperature and the frequency stabilities are enhanced by introducing BiAlO 3 into BaTiO 3 . The remnant polarization ( P r ) increases initially and then decreases with the increase of BiAlO 3 content, the maximum values of P r (9.5 μC/cm 2 for CS and 7.27 μC/cm 2 for MWS) are obtained at x = 0.02. The addition of BiAlO 3 can elevate the variation of polarization Δ P ( P max − P r ), its maximum values (12.56 μC/cm 2 for CS ceramic and 12.2 μC/cm 2 for MWS ceramic) are acquired at x = 0.04, 0.08, respectively. The energy storage properties indicate that the energy storage density ( W rec ) increases, while the energy storage efficiency ( η ) firstly decreases and then increases with the increase of x .
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CELLULOSE
·
2019
·Vol. 26
·期 13
·7863-7875
·
IF 3.917
Chen Shiliang,Xie Wenjie,Guo Bifan,Pan Ting,Chen Wenxing
The catalytic activity of metal phthalocyanine (MPc) heterogeneous catalyst is determined by both the microstructure of the support and the electron transfer efficiency of MPc during the reaction process. Inspired by this, we developed a novel, highly-efficient heterogeneous MPc catalyst based on the construction of a “reaction-involved” support. Graphene incorporated bacterial cellulose (G/BC) nanohybrid was conveniently prepared by an in situ biosynthetic method for the subsequent immobilization of tetraamino cobalt(II) phthalocyanine (CoPc) catalyst. The resulting graphene incorporated, CoPc decorated bacterial cellulose nanocomposite (CoPc@G/BC) was applied for decoloration of dye solutions, the G/BC support was deeply involved in the reaction process. The unique three-dimensional web-like framework structure of G/BC and the high affinity of graphene markedly promote the accessibility of reactants to the active sites of CoPc@G/BC, and the equilibrium adsorption data were best fitted by Freundlich model. With H 2 O 2 as an oxidant, dye molecules were catalytically oxidized by CoPc@G/BC, a ca. 70% enhancement of decoloration capacity was achieved with the incorporation of graphene. The catalytic oxidation was analyzed by electron paramagnetic resonance, highly reactive hydroxyl radical (·OH) was identified during the reaction, and the incorporated graphene can obviously promote the formation of ·OH. A potential mechanism of enhancement of catalytic activity of CoPc with G/BC support was originally proposed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 28
·28898-28908
·
IF 2.914
Zhang Yakun,Chen Sisi,Feng Xuezhen,Yu Jingang,Jiang Xinyu
The assembly of graphene oxide with biomass or polymers to form 3D hydrogels with excellent mechanical properties has become a research hotspot. In this work, the sponge-like kaolin/chitosan (CS)/reduced graphene oxide (rGO) composite was prepared for adsorption by simple self-assembly without cross-linking agent. The morphology, composition, surface properties, and pore size of as-prepared materials were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), zeta potential analyzer, Brunauer-Emmett-Teller surface area measurement (BET), and scanning electron microscopy (SEM). The effects of raw material ratio, contact time, temperature, pH, ionic strength, and recycling times on adsorption performance were investigated in detail. The results indicate that the composite has good absorption capacity for Cr(VI) and alizarin yellow R (AYR). Besides, composite hydrogel also exhibits excellent flexibility and good repeatability, which confirms its great potential as an adsorbent to remove pollutants in the water environment.
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JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1869-1877
·
IF 1.947
Chen Yang,Ma Xiangyu,Cai Wenjie,Chen Ailian
The type and structure of abrasive particles play a key role in the involved friction and wear processes during chemical mechanical polishing (CMP). This work aims to develop silica-based abrasives that improve both surface finish and removal rate. The uniform, three-dimensional, and dendritic-like mesoporous silica (D-mSiO 2 ) spheres with sub-100 nm size were synthesized in a heterogeneous oil–water biphase reaction system. The pore size of 3D-dendritic channels could be adjusted by regulating hydrophobic solvents in the upper oil phase. The improvements of root-mean-square roughness (0.18–0.26 nm) and removal rate (192–260 nm/min) were achieved for the D-mSiO 2 particles compared to colloidal silica abrasives (0.37 nm, 112 nm/min). A reduction from 2.90 to 0.48 and 2.60 to 0.42 nm for the maximum asperity height and the maximum valley depth respectively was also observed after CMP with D-mSiO 2 abrasives. Furthermore, the D-mSiO 2 particles with an enlarged pore size achieved a reduced surface roughness and an enhanced removal rate. The improved polishing performance may be attributed to the enlarged real contact area, the promoted tribo-chemical wear, and the enhanced adhesion effect between particles and surfaces. The contact area mechanism and the contact-penetration-adhesion model may be predominant and significant for D-mSiO 2 abrasives, rather than the traditional the indentation-based mechanism and the indentation-sliding model. The unique three-dimensional mesopores of D-mSiO 2 abrasives are expected to play key role in material removal processes, and it will have more hopeful prospects in CMP performance improvements.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-10
·
IF 5.479
He Baoshan,Yan Xiaohai
The authors constructed a voltammetric zearalenone (ZEN) aptasensor based on use of porous platinum nanotubes, gold nanoparticles (p-PtNTs/AuNPs) and thionine (Thi) labelled graphene oxide (GO). The p-PtNTs were synthesized in-situ based on tellurium nanowires as sacrificial templates. Subsequently, thiol-modified aptamers were self-assembled on the AuNPs that had been electrodeposited on the surface of the modified electrode. The presence of p-PtNTs on the electrode increases the loading with AuNPs and aptamers. It also warrants that the Thi-labelled GO can be assembled onto the aptamer via π interactions. In the presence of ZEN, it will be bound by the aptamer. The GO/Thi conjugate will be released from the aptamer, and this causes a decrease in Thi current. Under the optimal conditions and at a typical working potential of −0.22 V (vs. Ag/AgCl), the method has a linear range that covers the 0.5 pg·mL −1 to 0.5 μg·mL −1 ZEN concentraion range and a lower detection limit of 0.17 pg·mL −1 .
Voltammetric zearalenone aptasensor based on use of porous platinum nanotubes/gold nanoparticles and thionine labelled graphene oxide was fabricated for the detection of zearalenone.
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Food Analytical Methods
·
2019
·Vol. 12
·期 11
·2614-2622
·
IF 2.413
Xu Lu,Wei Liuna,Shi Qiong,Cai Chenbo,Fu Hai-Yan,She Yuan-Bin
The feasibility of a highly sensitive “turn-off” fluorescent probe of double quantum dots (QDs) combined with chemometrics was investigated for untargeted screening of extraneous adulterants in pure orange juice (OJ), including sucrose syrup and artificial fruit powder. Pure and adulterated OJ samples were characterized by their different quenching patterns of the two separate and strong fluorescent peaks generated by the double QDs followed by chemometrics analysis. Class models of pure OJ samples ( n = 117) obtained from pressing newly harvested oranges were developed using one-class partial least squares (OCPLS) based on different signal preprocessing methods, including smoothing, taking second-order derivatives (D2) and standard normal variate (SNV) transformation. As a result, D2-OCPLS model could detect at 5.0% ( w / w ) of sucrose syrup and 2.0% ( w / w ) of artificial fruit powder in pure OJ with a sensitivity (the rate of true positives) of 97.8% and specificity (rate of true negatives) of 77.0%. In conclusion, the proposed fluorescence probe with double QDs has been demonstrated to have potential for applications in rapid and sensitive screening of adulterants in OJ, which also implies promising applications to untargeted analysis of other water-soluble food samples.
Graphical Abstract
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Frontiers of Chemical Science and Engineering
·
2019
·Vol. 13
·期 2
·340-349
·
IF 2.809
Zhou Rusen,Zhou Renwu,Zhang Xianhui,Bazaka Kateryna,Ostrikov Kostya Ken
Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier discharge plasma water bed system was designed and then coupled with granular activated carbon (GAC) adsorption to rapidly remove acid fuchsine (AF) with high efficiency. Effects of feeding gases, treatment time and initial concentration of AF on removal efficiency were investigated. Results showed that compared to the N 2 and air plasmas treatments, O 2 plasma processing was most effective for AF degradation due to the strong oxidation ability of generated activated species, especially the OH radicals. The addition of GAC significantly enhanced the removal efficiency of AF in aqueous solution and shorten the required time by 50%. The effect was attributed to the ability of porous carbon to trap and concentrate the dye, increasing the time dye molecules were exposed to the plasma discharge zone, and to enhance the production of OH radicals on/in GAC to boost the degradation of dyes by plasma as well as in situ regenerate the exhausted GAC. The study offers a new opportunity for continuous effective remediation of wastewater contaminated with organic dyes using plasma technologies.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 33
·34345-34356
·
IF 2.914
Liu Lili,Chen Xin,Wang Zhiping,Lin Sen
Fluoroquinolones (FQs) occur broadly in natural media due to its extensive use, and it has systematic effects on our ecosystem and human immunity. In this study, long-root Eichhornia crassipes was reclaimed as a multi-functional activated carbon (MFAC) to remove fluoroquinolones (FQs) from contaminated water. To get insight into the adsorption mechanism, multiple measurements, including FTIR and XPS analyses, were employed to investigate the adsorption processes of ciprofloxacin and norfloxacin as well as the experiments of effect of exogenous factors on adsorption performances. The results confirmed that the adsorption of FQs by MFAC was mainly attributed to the electrostatic interaction, hydrogen bond interaction, and electronic-donor-acceptor (EDA) interaction. In addition, the kinetics and thermodynamics experiments demonstrated that the MFAC possessed great adsorption performance for FQs. According to the Langmuir model, the saturated adsorption capacities exceeded 145.0 mg/g and 135.1 mg/g for CIP and NOR at 303.15 K, respectively. The column experiments were conducted to explore the application performance of MFAC on the advanced treatment of synthetic water at different flow rates and bed depths. The adsorption capacity of CIP on MFAC was estimated by the Thomas models and the bed-depth service time (BDST) models, reaching 127.56 mg/g and 11,999.52 mg/L, respectively. These results also provide a valid approach for the resource recycling of the redundant long-root Eichhornia crassipes plants.
Graphical abstract
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IONICS
·
2019
·Vol. 25
·期 11
·5485-5494
·
IF 2.289
Wang Xiaoqing,Tian Songran,Zhang Xiaoqing,Li Guoyan,Liu Ying,Chen Botao,Cheng Bowen
A 3D Ni 3 S 2 @Mn-Co-OH/NF cross-linked nanosheet heterostructure composite electrode has been successfully fabricated by a facile two-step hydrothermal method. The as-prepared Ni 3 S 2 @Mn-Co-OH/NF composite electrode exhibits a high capacitance (3163 F g −1 at a current density of 3 mA cm −2 ), a superior rate performance (2071 F g −1 at a current rate of 30 mA cm −2 ), and stable cycling property (maintaining 96.6% of the initial capacitance after 4000 cycles at a current rate of 10 mA cm −2 ). This excellent electrochemical performance can be ascribed to the unique cross-linked nanosheet heterostructure formed directly on Ni foam current collector and the synergistic effect between Mn-Co-OH and Ni 3 S 2 of the composite electrode.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2019
·Vol. 17
·期 1
·1-11
·
IF 5.345
Zhang Yujie,Wu Mingxin,Dai Wubin,Chen Min,Guo Zhaoyang,Wang Xin,Tan Di,Shi Kui,Xue Longjian,Liu Sheng,Lei Yifeng
Background Diabetes is one of the biggest medical challenges worldwide. The key to efficiently treat type 1 diabetes is to accurately inject insulin according to the blood glucose levels. In this study, we aimed to develop an intelligent insulin-releasing gold nanocluster system that responds to environmental glucose concentrations.Results We employed gold nanoclusters (AuNCs) as a novel carrier nanomaterial by taking advantage of their high drug-loading capacity. We prepared AuNCs in the protection of bovine serum albumin, and we decorated AuNCs with 3-aminophenylboronic acid (PBA) as a glucose-responsive factor. Then we grafted insulin onto the surface to obtain the glucose-responsive insulin-releasing system, AuNC-PBA-Ins complex. The AuNC-PBA-Ins complex exhibited high sensitivity to glucose concentration, and rapidly released insulin in high glucose concentration in vitro. In the type 1 diabetic mouse model in vivo, the AuNC-PBA-Ins complex effectively released insulin and regulated blood glucose level in the normoglycemic state for up to 3 days.Conclusion sWe successfully developed a phenylboronic acid-functionalized gold nanocluster system (AuNC-PBA-Ins) for responsive insulin release and glucose regulation in type 1 diabetes. This nanocluster system mimics the function of blood glucose regulation of pancreas in the body and may have potential applications in the theranostics of diabetes.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 3
·611-620
·
IF 3.637
Wang Chengnan,Gao Xia,Wang Shuo,Liu Yaqing
Infections caused by foodborne microorganisms are a great threat to the global environment and public healthcare today. Thus, rapid, portable and sensitive assays that can realize the identification of foodborne bacteria are highly desired. In this study, a smart fluorescent and colorimetric dual-readout sensing system has been established for simple and rapid E. coli determination by utilizing the Cu 2+ -triggered oxidation of o -phenylenediamine (OPD). Initially, Cu 2+ can oxidize OPD to OPDox, resulting in an orange-yellow fluorescence and visible pale-yellow color. However, E. coli can effectively reduce Cu 2+ into Cu + , inhibiting the Cu 2+ -triggered oxidation of OPD to OPDox. Consequently, the introduction of E. coli can turn off both the fluorescence and the UV-vis absorbance signals of the OPD-Cu 2+ system, illustrating an original mechanism for fluorescent and colorimetric dual-channel detection of E. coli . Moreover, a filter paper-based visual sensor was built and coupled with OPD-Cu 2+ solution under the assistance of a UV lamp. The as-prepared sensor can detect E. coli quantitatively with the help of a typical smartphone color-scanning application (APP). Thus, this study offers a valid dual-mode assay for sensitive and on-site visible detection of E. coli , guaranteeing the reliability of the results and is more attractive for practical use.
Schematic illustration of the smartphone-integrated sensing system for fluorescent and colorimetric dual-channel detection of E. coli based on the Cu 2+ -OPD system.
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