DESALINATION
·
2015
·
IF 3.756
Jun Yin,Jiancheng Zhou
To avoid the agglomeration of nanoparticles (NPs) in hybrid membranes and alleviate the leakage of NPs during the oily wastewater treatment process , poly(2-(dimethylamino)ethylmethacrylate- co -3-dimethyl(methacryloyloxyethyl)ammoniumpropanesulfonate) (PDMAEMA- co -PDMAPS) grafted silica (SiO 2 ) [SiO 2 - g -(PDMAEMA- co -PDMAPS)] NPs were prepared by grafting PDMAEMA brushes onto SiO 2 NPs surface via the surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (Si-ARGET ATRP). Subsequently, the quaternization of the tertiary amine groups in PDMAEMA and 1,3-propanesultone was performed to get [SiO 2 - g -(PDMAEMA- co -PDMAPS)] NPs. Then, the organic–inorganic hybrid polyethersulfone (PES) membranes with different ratios of SiO 2 NPs (m membranes) and SiO 2 - g -(PDMAEMA- co -PDMAPS) NPs (M membranes) were fabricated via the non-solvent induced phase separation (NIPS) process. Transmission electron microscopy (TEM) images demonstrated that the modification of SiO 2 NPs with PDMAEMA- co -PDMAPS was favorable for their homogeneous dispersion in organic solvents. The results of scanning electron microscopy (SEM) images indicated that the surface porosity and mean pore size of hybrid membranes were increased compared to the neat PES membrane. Furthermore, the M membranes exhibited better hydrophilicity , pure water flux and oil flux than neat PES membrane and m membranes. It was found from filtration results that the total fouling (R t ) and irreversible fouling (R ir ) were significantly reduced due to higher hydrophilicity of hybrid membranes. In addition, after oil-in-water emulsion filtration, M membranes exhibited higher water flux recovery ratio (FRR) value than that of m membranes and neat PES membrane.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2013
·Vol. 44
·期 8
·1120-1125
·
IF 2.679
Bi-Qi Zhang,Song-Bo Li,Qing Xiao,Ju Li,Jian-Jun Sun
The recently reported shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) is considered as the next generation of advanced spectroscopy for its surface and molecular generality. With the aim to utilize the virtues of shell-isolated strategy and advance the SHINERS technique, we introduce a silane-based rapid synthesis method of silica-coating Au nanorods (Au@SiO 2 NRs) with manoeuvrable ultra-thin shell and tunable SPR. The results demonstrate that the SPR of Au NRs could be optimized to obtain large Raman enhancement using either 633 nm or 785 nm laser. Differing from previously reported Au@SiO 2 NRs synthesis method, we can tune the silica shell thickness within several nanometers to maximize the Raman signal while effectively eliminating the exterior interference. And this advanced synthesis method has also significantly reduced the silica-coating time from one day to ca. 1 h. This method as a new development of SHINERS technique has successfully got enhanced signal in solution Raman tests of malachite green, giving a great potential to be extended to in-situ measurement for daily life detection. Copyright © 2013 John Wiley & Sons, Ltd.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Lixin Xing,Ningning Guo,Yatao Zhang,Haoqin Zhang,Jindun Liu
Silica spheres in nanoscale were prepared via sol–gel method and then sodium 4-styrene sulfonate was grafted onto the surfaces of SiO 2 (PSS-SiO 2 ) by surface-initiated atom transfer radical polymerization (SI-ATRP). Then, a negatively charged loose SiO 2 -PSS/polyethersulfone (PES) nanofiltration membrane with high flux was fabricated via phase inversion method. FT-IR and TEM results showed that SiO 2 nanoparticles were synthesized and modified successfully. GPC results further proved the “living”/controlled behavior of SI-ATRP. The morphology, hydrophilicity of the membranes were investigated by SEM, static water contact angle and water ratio. The results revealed that the surface hydrophilicity and water permeability of hybrid membranes were greatly improved after adding SiO 2 -PSS and thus may enhance fouling resistance to a certain extent. The salt permeation and separation of dye/salt mixture of the hybrid membranes were significantly superior to the pure PES membrane, and the order of permeation for different salt solutions was NaCl > MgCl 2 > MgSO 4 > Na 2 SO 4 . When the content of SiO 2 -PSS was 3.0 wt%, the hybrid membrane showed optimal performance with IEC value of 0.07 mmol/g and pure water flux of 269.5 L m −2 h −1 and the rejections for all types of salts declined to under 11%. The above results indicated that SiO 2 -PSS incorporated into PES matrix played an important role in enhancing the performance of NF membranes, which may possess a significant impact on the application in dye purification and desalination.
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Materials
·
2017
·Vol. 10
·期 4
·411
·
IF 2.654
Jing Zhao,Ming Zeng,Kaiqiang Zheng,Xinhua He,Minqiang Xie,Xiaoyi Fu
Thermoresponsive P(NIPAM-AA)/Fe3O4/SiO2microspheres with surface holes serving as carriers were prepared using p-Fe3O4/SiO2microspheres with a thermoresponsive copolymer. The p-Fe3O4/SiO2microspheres was obtained using a modified Pickering method and chemical etching. The surface pore size of p-Fe3O4/SiO2microspheres was in the range of 18.3 nm~37.2 nm and the cavity size was approximately 60 nm, which are suitable for loading and transporting biological macromolecules. P(NIPAM-AA) was synthesized inside and outside of the p-Fe3O4/SiO2microspheres via atom transfer radical polymerization of NIPAM, MBA and AA. The volume phase transition temperature (VPTT) of the specifically designed P(NIPAM-AA)/Fe3O4/SiO2microspheres was 42.5 °C. The saturation magnetization of P(NIPAM-AA)/Fe3O4/SiO2microspheres was 72.7 emu/g. The P(NIPAM-AA)/Fe3O4/SiO2microspheres were used as carriers to study the loading and release behavior of BSA. This microsphere system shows potential for the loading of proteins as a drug delivery platform.Keywords:P(NIPAM-AA);Fe3O4/SiO2hollow microspheres;holes;drug release
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Haiyan Wang,Chunling Qi,Wenhuan He,Minghui Wang,Wenjing Jiang,Huanshun Yin,Shiyun Ai
A novel, simple and sensitive photoelectrochemical (PEC) immunosensing platform was constructed for detecting N 6 -methyladenosine (m 6 A) based on the carboxylated CN and avidin functionalized [email protected] 2 (ARS) nanocomposite . Herein, the N 6 -methyladenosine-5′-triphosphate (m 6 ATP) was selected as the detection target molecule, m 6 A antibody was used as recognition unit for m 6 A, the carboxylated g-C 3 N 4 (CN) was not only used as the photoactive substance, but the substrate for the m 6 A antibody immobilization , ARS was synthesized and used as signal amplification unit to improve the photocurrent of CN, Phos-tag-biotin was employed as bridge of m 6 ATP and [email protected] 2 through the specific interaction between phosphate group of m 6 ATP and Phos-tag, biotin and avidin, respectively. Under the optimal condition, the fabricated PEC biosensor showed a linear range of 0.01–10 nM and high detection sensitivity with low detection limit of 3.23 pM for m 6 ATP. Besides, the developed strategy was also successfully applied to evaluate the content of m 6 A in human serum samples.
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BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Weiwei Hu,Quansheng Chen,Huanhuan Li,Qin Ouyang,Jiewen Zhao
Rare earth-doped upconversion nanoparticles have promising potential in the field of pesticide detection because of their unique frequency upconverting capability and high detection sensitivity. This paper reports a novel aptamer-based nanosensor for acetamiprid detection using fluorescence resonance energy transfer (FRET) between NH 2 -NaYF 4 : Yb, [email protected] 2 (UCNPs) and gold nanoparticles (GNPs). Herein, GNPs as acceptors efficiently quench the fluorescence of UCNPs and acetamiprid specifically interacts with acetamiprid binding aptamer (ABA), causing the conformation changes of ABA from random coil to hairpin structure. Accordingly, ABA no longer stabilizes the GNPs in salt solution, leading to the varying aggregation extent of GNPs. Thus, the fluorescence of UCNPs are proportionally recovered. Under the optimized conditions, the enhancement efficiency was observed to increase linearly with the concentration of acetamiprid from 50 nM to 1000 nM, resulting in a relatively low limit of 3.2 nM. Additionally, the aptasensor demonstrated high selectivity to similar structure pesticides such as imidacloprid and chlorpyrifos , and further confirmed its application capacity in adulterated tea samples.
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INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Xiaoting Zhang,Shuangshuang Jing,Zehong Chen,Linxin Zhong,Qingzhong Liu,Xinwen Peng,Runcang Sun
3D porous inorganic materials play a vital role in various applications, such as adsorption, catalysis, and electrochemistry, and are an ongoing interest in the synthesis of advanced porous materials. Herein, we aimed to fabricate 3D free-standing hierarchical porous TiO 2 and SiO 2 with tunable porous structure and high specific surface area by using cellulose aerogel as a new biotemplate. The results revealed that the hierarchical porous structure of 3D porous TiO 2 and SiO 2 could be easily tailored by controlling annealing process. The physicochemical structure of the resultant porous materials, such as morphology, specific surface area and phase structure, strongly depended on the thermal stability of the biotemplate. 3D porous TiO 2 and SiO 2 with specific surface areas of high up to 221.1 m 2 /g and 451.3 m 2 /g could be obtained, respectively. In addition, the as-prepared TiO 2 exhibited a high photocatalytic activity, demonstrating their potential application in advanced photocatalysis.
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TALANTA
·
2016
·
IF 4.035
Yaqi Li,Li Sun,Qian Liu,En Han,Nan Hao,Liuping Zhang,Shanshan Wang,Jianrong Cai,Kun Wang
A methodology for detection of the Cauliflower Mosaic Virus 35S(CaMV35S) promoter was developed to distinguish transgenic from non-transgenic soybean samples by using photoelectrochemical (PEC) biosensor. In this PEC biosensing system, the as-prepared gold nanoparticles-reduced graphene oxide acted as a nanocarrier to immobilize the thiol-functional probe (probe1), and the SiO 2 @CdTe quantum dots (QDs) core-shell nanoparticles tagged with the amino-functional probe (probe2) acted as signal indicators, respectively. In the presence of target DNA (tDNA) of CaMV35S, the binding of tDNA with probe1 and probe2 through the high specific DNA hybridization led to the fabrication of sandwich structure, and thus the high loading of the signal indicators SiO 2 @CdTe QDs at the electrode surface, which increased the PEC signal. The increased PEC signal depended on the concentration of tDNA, and a wide linear range from 0.1 pM to 0.5 nM with low detection limit of 0.05 pM was obtained. In addition, the PEC biosensor has been successfully used for discriminating transgenic soybean from non-transgenic samples, which was consistent with the polymerase chain reaction (PCR) results, suggesting the proposed PEC biosensor is a feasible tool for the further daily genetically modified organism detection.
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RSC Advances
·
2016
·Vol. 6
·期 97
·94976-94988
·
IF 3.289
Longfei Liao,Ying Liu,Zengyong Li,Junping Zhuang,Yanbin Zhou,Size Chen
Amino modified Fe3O4@SiO2 (Fe3O4@SiO2–NH2) was used to immobilize Cu2+ and VO2+ for preparing Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalysts. Various technologies had been used for the characteristics of catalysts, such as XRD, XPS, FT-IR, SEM, TEM and VSM. The catalytic performance of Fe3O4@SiO2–NH2–VO2+ in HMF oxidation could be significantly enhanced by the use of Fe3O4@SiO2–NH2–Cu2+ as the co-catalysts. The type of reaction solvents showed a great influence on the oxidation of HMF. The highest HMF conversion reached up to 98.7% at 110 °C in toluene with an optimal 2,5-diformylfuran yield of 85.5%. Moreover, the Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalyst exhibited great stability and could be readily applied in the next recycle after magnetic separation.
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RSC Advances
·
2016
·Vol. 6
·期 111
·110409-110415
·
IF 3.289
Jin Dong,Baoping Lin
As an effective luminescent down-shifting (LDS) species, Eu3+ complexes have been doped in ethylene-vinyl acetate (EVA) films to improve the spectral response of silicon photovoltaic modules in the ultraviolet region. One key point about the improvement of photoelectric conversion efficiency by the LDS technique is increasing the fluorescence intensity of the EVA composite film as far as possible while staying within the visible light transmittance of the film. Around this point, we attempt to offer an idea for further studies. In this study, nano-SiO2 modified by a silane coupling agent was doped into EVA film with a fixed content of Eu3+ complex by the casting method. The experimental results show that when the modified SiO2 content is within 4%, the fluorescence of the EVA composite film gradually increases with increase in the modified SiO2 content and before formation of EVA composite film, the fluorescence intensities have no difference between the mixture with modified SiO2 and that without modified SiO2. SEM and AFM images of the EVA composite films show that the complex particles are probably enwrapped by aggregations of the modified SiO2 during the film-forming process, which strengthens the rigidity of the Eu3+ complex in the structure and results in the enhancement of fluorescence intensity. When the modified SiO2 content is within 2%, the visible light transmittance of the EVA film only slightly decreases. The photoelectric conversion efficiency of polycrystalline silicon solar cell coated with the composite film increases from 12.13% to 12.29%. Hence, the study provides a feasible approach to improve the LDS technique and has a potential application value.
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ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Wenfen Zhang,Yanhao Zhang,Qiong Jiang,Wenjie Zhao,Ajuan Yu,Hong Chang,Ximei Lu,Fuwei Xie,Baoxian Ye,Shusheng Zhang
To satisfy the requirement of simultaneous extraction and characterization of diverse kinds of multitarget analytes, the preparation, characterization, and application of a novel tetraazacalix[2]arene[2]triazine (TCT) coated magnetic nanoparticle (TCT MNP) adsorbent are presented in this paper. TCT assembles two benzene rings and two triazines with nitrogen cross-bridging links, which exhibits a unique structural framework and versatile recognition features based on the multiple recognition sites. These include π electron stacking, charge transfer, hydrogen bonding, and ion-exchange. TCT MNPs acted as a dispersive SPE adsorbent showing strong interaction with and adsorption of polycyclic aromatic hydrocarbons (PAHs), nitroaromatics, and heavy metal ions. The dispersive magnetic nanoparticle solid phase extraction (d-MNSPE) strategy with the simultaneous extraction and stepwise elution (SESE) procedure was designed and optimized for the five PAHs (phenanthrene, anthracene, pyrene, chrysene, and benzo(a)pyrene), six nitroaromatics (4-nitrotoluene, 2,4-dinitrotoluene, 2,4,6-trinitrotoluene, 4-nitrophenol, 2,4-dinitrophenol, and 2,4,6-trinitrophenol), and four metal ions (Cu, Zn, Mn, Cd) in aqueous samples. Due to the high stability, desirable durability, larger saturation magnetization, reuse and distinct enrichment capacity of TCT MNPs, the d-MNSPE method with the SESE strategy provided high recovery (>90%) and good precision (relative standard deviations, RSD < 10%). Coupled with the commonly used HPLC-fluorescence detection, HPLC-UV detection, and atomic absorption spectrometry, these trace probes in tap water, river water, and lake water were determined with very low detection limits, in the range of 0.09–0.15 pg mL–1 for PAHs, 6–11 pg mL–1 for nitroaromatics, and 17–53 pg mL–1 for metal ions after being enriched by the d-MNSPE. The determination of trace PAHs in urine samples from smokers and nonsmokers was successfully carried out with this method, which implied that the versatile TCT MNPs and the robust method together represent a significant potential application in the analysis of body fluids and disease markers. Such methods for accurate quantification of trace components in water are very valuable as they fulfill an unmet need in environmental and medicinal chemistry.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Weihao Ma,Hao Zhang,Jiayuan Nie,Chunyu Qiang,Zhiwei Li,Ling Ma,Ke Wang
In this study, a novel magnetic covalent organic framework (Fe 3 O 4 @SiO 2 -HBTA-TTA-COF) was synthesized, which was fully characterized by scanning electron microscopy, transmission electron microscopy, etc. Furthermore, a new method was developed for the determination of 25 quinolones (QNs) in water and milk using the Fe 3 O 4 @SiO 2 -HBTA-TTA-COF as magnetic solid-phase extraction adsorbent coupled with ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Meanwhile, various experimental parameters were optimized including sample solution pH, adsorbent dosage and extraction time, etc. Under the optimal conditions, good linearity in the range of 0.1–200 μg·L −1 (R 2 ≥ 0.999) were obtained, the recoveries of 25 QNs were 70.04 %–104.4 % with the relative standard deviations lower than 9.87 % (n = 5), the limits of detection were 0.003–0.010 μg·L −1 for water and 0.018–0.722 μg·kg −1 for milk. This established method was high-sensitive and high-throughput, which can be used as a good alternative method for the selective determination of 25 QNs in water and milk.
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