ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Dongmiao Qin,Xiaohua Jiang,Guichun Mo,Jinsu Feng,Biyang Deng
A label-free electrochemiluminescence (ECL) immunosensor is developed to detect alpha-fetoprotein (AFP). Ru (bpy) 3 2+ -doped silica nanoparticles (Ru–SiO 2 ) and gold nanoparticle-modified reduced graphene oxide (rGO@Au) are integrated to form an rGO@Au@Ru–SiO 2 composite. The composite is employed as a carrier for immobilizing the target antibody, and a label-free ECL immunosensor is constructed via antigen–antibody interaction. Owing to the numerous Ru (bpy) 3 2+ molecules in the Ru–SiO 2 , a high ECL signal is acquired. With excellent conductivity and a large surface area, the rGO@Au composite not only accelerates electron transfer but also improved the ECL signal and captures antibodies, thus enhancing ECL response and sensitivity. Moreover, boron nitride quantum dots (BNQDs) are used as rGO@Au@Ru–SiO 2 coreactants, achieving high ECL intensity. The proposed ECL system exhibits significant potential in bioanalysis , which is attributed to the excellent biocompatibility and good stability of BNQDs. Under optimal experimental conditions, the sensor has a linear range of 0.0001 ng mL −1 to 100 ng mL −1 and a limit of detection equal to 0.03 pg mL −1 (S/N = 3). The proposed technique is successfully applied in the susceptible detection of AFP in human serum. The recovery ranges from 99% to 100%, and the RSD is less than 2.8%. The constructed ECL immunosensor exhibits acceptable performance during actual application.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Sihan Wang,Tao Peng,Qingyi Meng,Xiaoli Zhu,Liuchuan Guo,Kai Yao,Zheng Wang,Pimiao Zheng,Zhenhui Ren,Zhiwei He,Jing Zhang,Haiyang Jiang
A novel impedance biosensor was developed based on the interdigitated microelectrodes using H 2 O 2 to reduce SiO 2 @MnO 2 nanocomposites into Mn 2+ , resulting in significant impedance changes in the rapid and ultrasensitive detection of Salmonella typhimurium ( S . typhimurium ). The captured S . typhimurium monoclonal antibodies (MAb 1 ) were assembled on the outer layer of the magnetic beads (MBs) for specific enrichment and isolation of S . typhimurium cells in complex samples. The recognized S . typhimurium monoclonal antibodies (MAb 2 ) were immobilized on the surface of the SiO 2 @MnO 2 nanocomposites, which could react with the MBs- S . typhimurium conjugates to form the MBs- S . typhimurium -SiO 2 @MnO 2 sandwich complexes. The MnO 2 on the surface of the sandwich complexes was reduced into Mn 2+ by using H 2 O 2 achieving obvious impedance change that could be detected by the interdigitated microelectrodes. The recoveries for S . typhimurium cells at the concentrations between 2.0 × 10 1 and 2.0 × 10 5 CFU/mL were 83.1 %–97.0 % in the spiked milk samples. The limit of detection of this biosensor for S . typhimurium cells in the spiked milk samples was 21 CFU/mL. This approach possesses the merits of simple operation, high sensitivity, and low cost, potentially enabling this device to be a lab-on-a-chip for rapid screening of foodborne pathogens.
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CELLULOSE
·
2019
·Vol. 27
·期 1
·481-491
·
IF 3.917
Sun Zhuangzhi,Li Zhaoxin,Li Wenzong,Bian Fuguo
Solar steam evaporation is regarded as a green and efficient method to achieve desalination and purification. However, the low-efficiency photothermal conversion of its evaporator is an obstacle to widespread application. Focusing on the interface evaporation method through photothermal conversion, the current bottleneck of the technology is that it is impossible to achieve in-depth interface control of the incident light path to obtain higher water evaporation efficiency. We propose a mesoporous cellulose-based hydrogel for the manufacture of a high-efficiency solar steam evaporator. This type of solar evaporator achieves an enhanced capillary force and optical path extension to increase the photothermal conversion efficiency and evaporation rate. These evaporation performance advantages can all be attributed to the dense mesoporous structure, low thermal conductivity, and high light absorption efficiency. The results showed that under a solar light intensity of 1.5 kW m −2 , the mesoporous structure of the MCNT–TiO 2 –SiO 2 –TiN hydrogel-based evaporator has an excellent evaporation rate (1.853 kg m −2 h −1 ) and high solar energy conversion efficiency (77.39%) due to the low thermal conductivity (0.71997 W m −1 k −1 ), high light absorption efficiency (98.3%, wavelength 190–3000 nm) and good hydrophilic properties (XRD and FT-IR tests). Our results demonstrate a new full-hydrogel solar steam evaporation method by using a simple, easily obtained, reusable, and low-cost solar desalination and purification system based on evaporation can yield fresh water from seawater and sewage. The evaporation technique can be used to produce a simple, easily obtained, reusable, and low-cost solar desalination and purification system for pure freshwater resources from seawater and sewage.
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Lele Jin,Wenzhi Li,Qiying Liu,Longlong Ma,Chao Hu,Ajibola T. Ogunbiyi,Mingwei Wu,Qi Zhang
In this study, the Mo-promoted Ir/SiO 2 (Ir-MoO x /SiO 2 ) catalysts combined with the zeolite HZSM-5 were used for the direct conversion of microcrystalline cellulose (MCC) to liquid fuel (C 5 /C 6 alkanes) in n-dodecane/H 2 O system. A synergistic effect was formed between the partially reduced MoO x species and the Ir particles, which effectively promoted the catalytic activity of Ir/SiO 2 catalyst. When the Mo/Ir molar ratio was 0.5, a high yield of C 5 /C 6 alkanes (91.7%) was achieved at 210 ℃ for 12 h. In addition, the main component of C 5 /C 6 alkanes was n-hexane, which was proven to be obtained by the hydrogenolysis of the key intermediate, sorbitol, formed from the hydrolysis and hydrogenation of MCC.
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Journal of Chemistry
·
2019
·
IF 1.727
Shiyun Tang,Jingyu Ran,Junjiang Guo,Anjiang Tang
To obtain high stable and effective TiO2 photocatalyst, nano-N-doped TiO2@SiO2 (TiO2−xNx@SiO2, 0 ≤ x ≤ 2) composite aerogels were synthesized by the sol-gel method combined with supercritical drying and direct oxidation process. The adsorption/photocatalytic degradation efficiency of TiO2−xNx@SiO2 aerogels was evaluated by the degradation of RhB in aqueous solution under visible light irradiation. The physiochemical properties of the aerogels were examined by XRD, FT-IR, TEM, SEM, TG/DTA, and BET methods. It was found that the specific surface areas of all TiO2−xNx@SiO2 samples exceeded 700 m2/g and exhibited a honeycomb porous structure with fine particulate morphology. Photocatalytic activity tests show that the 500-TiO2@SiO2 composite aerogel exhibits the best adsorption/photocatalytic degradation rate for RhB, which obtained about 80% of the degradation rate in 30 min under visible light and over 95% after 120 min. On the one hand, the SiO2 aerogels can significantly inhibit the phase transition of TiO2, and the nano TiO2 can be highly dispersed in the SiO2 aerogels; On the other hand, if the oxidation temperature is selected properly, the N-doped TiO2−xNx@SiO2 aerogel can be obtained by simple TiN@SiO2 aerogel oxidation.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 24
·6875-6883
·
IF 5.726
Yanlong Qi,Shijun Liu,Zaizhi Liu,Long Cui,Lingyun Huang,Yinxin Yang,Ruiyao Wu,Quanquan Dai,Jianyun He,Wei Dong,Chenxi Bai
The production of valuable chemicals from renewable resources has attracted wide interest, and the present work focuses on the transformation of a furfural–acetone adduct into a functionalized 1,3-diene which can purposefully improve the interfacial properties of resulting polymer materials. Pr modified CeO2 catalysts supported on silica were prepared, and the correlation between catalyst nature and catalytic performance (conversion, selectivity and formation rate) was extensively investigated. A yield of 94% was obtained over the optimized catalyst (PrCe2.11/SiO2), and the yield still remained at >89% after 10 h on stream. Low-temperature adsorption of nitrogen, inductively coupled plasma (ICP), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to clarify the catalyst structure. The results indicated that Ce and Pr species exist as CeO2 and Pr6O11, respectively, without the formation of a PrCe solid solution. The migration of Pr leads to its enrichment on the catalyst surface, and the interaction between Pr and Ce plays a crucial role in the uniform dispersion of nanoparticles. More importantly, this suggested that the modification of ceria with Pr can selectively create oxygen vacancies instead of lattice distortions. The correlation between the catalytic performance and catalyst nature implies that the improvement in catalytic performance is linearly correlated with the oxygen vacancy concentration. Besides, a plausible reaction pathway for the transformation of a furfural–acetone adduct over PrCe/SiO2 was proposed involving a radical mechanism.
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Chenxiao Zhang,Lihong Nie,Jiafan Wang,Beifu Wang
In this work, a new type of composite nanoparticles, ‘pearl chain’, was developed by linking titanium dioxide and silicon dioxide by polyacrylic acid polymer chains, and the prepared TiO2-PAA-SiO2 composite nanoparticles were analysed by SEM, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and thermogravimetric analysis, zeta potential, x-ray diffraction, etc. The success of this work was verified by the successful linking of TiO2-PAA-SiO2 composite nanoparticles.TiO2-PAA-SiO2 composite nanoparticles were analysed to verify the successful attachment of pearl chains. The obtained TiO2-PAA-SiO2 were subsequently blended in different ratios to prepare polyvinylidene fluoride (PVDF) ultrafiltration membranes. The membrane performance was tested by porosity and water contact angle measurements, scanning electron microscopy, as well as experiments using bovine serum proteins and MTBE interception. The results showed that when a certain amount of TiO2-PAA-SiO2 was added, the surface wettability, porosity and permeability of the prepared modified composite membranes were significantly improved, and the BSA adsorption rate was increased from 71.59% to 80.86%, and the retention rate of MTBE was increased by 77%, in addition to showing a better anti-pollution effect (FRR: 91.07%). It was finally concluded that the prepared membranes embedded with 1.0 wt.% TiO2-PAA-SiO2 nanofillers showed good overall filtration performance, better contamination resistance and remarkable durability. The present work successfully demonstrated the feasibility of using polyacrylic acid chemical chains to connect nanoparticles with different functions to prevent particle loss and substantially enhance membrane performance, which is valuable for bridging connection of composite nanoparticles and exploring the development of high-performance ultrafiltration membranes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xing-Yao Zhao,Xiao-Song Zhang,Xin Liu,Xiao-Kai Gong,Xiu-Rong Yuan,Bao-zeng Zhou,Jian-Ping Xu,Li-Na Kong,Lan Li
Lead-based perovskite quantum dots (QDs) have promising applications in optoelectronic devices , but commercial applications are limited by the potential toxicity and poor stability of lead. Meanwhile, there are lattice, polarity, and thermal expansion coefficient mismatches in integrating semiconductor materials onto the surface of photoelectronic circuit devices, resulting in high-density defects limiting the reliability of photoelectronic devices. Therefore, there is a need to investigate perovskite alternatives that are non-toxic, stable, and can be effectively coupled to silicon photonic circuits. In this paper, lead-free perovskite Cs 3 Bi 2 Br 9 /SiO 2 QDs were synthesized. The emission wavelength falls within the 400–560 nm range, exhibiting vibrant blue photoluminescence and demonstrating exceptional air stability for a duration exceeding 60 days. Optical tests and density-functional theory (DFT) calculations show that the silica shell layer effectively binds the electron and hole wave functions, prevents photon-generated carriers from escaping, reduces surface defects , and improves the carrier recombination probability. Meanwhile, using Cs 3 Bi 2 Br 9 /SiO 2 QDs as a luminescent down-shifting (LDS) layer in combination with a conventional silicon solar cell , the photovoltaic conversion power was increased by 1.82%. Hence, the core-shell structure is designed by the green environmental protection method to control the improvement of the PL characteristics of QDs , which opens a window for the synthesis of new barrier materials in ethanol and water systems, making the Cs 3 Bi 2 Br 9 /SiO 2 QDs have great potential for the application of novel optoelectronic devices in the future.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bin Xu,Maohua Hou,Qinqin Xu,Jieying Su,Haitao Zhang,Xiaohui Lu,Zhongjin Ni
In recent years, artificial amorphous photonic structure (APS) materials with high color saturation and angle independence have been competitively reported. However, there is a lack of research into their functionalization and application in practical environments. Here, with practical applications in mind, we prepared APS pigments based on CB@SiO2@TiO2 core–bishell nanospheres and demonstrated high color saturation, enhanced color stability, and excellent photocatalytic activity. SiO2 effectively protected the carbon black particles from ablation during the calcination process. Paints composed of ethanol, ethyl cellulose (EC), and pigments could be spray-coated on any substrate to prepare a structurally colored coating without limitation. The coatings show good mechanical stability and photothermal stability. The color of the structurally colored pigments can be easily changed by adjusting the sizes of the CB@SiO2@TiO2 nanospheres. The photocatalytic activity of the pigments on formaldehyde (HCHO) and methylene blue (MB) solution and reaction kinetics of their degradation were studied by experiment. The results showed that the photocatalytic activity of the pigments increased with the increase of the TiO2 loading, and the degradation rate of HCHO reached 96.7% for 3 h and that of MB reached 97.9% for 60 min when the TiO2 shell thickness was 40 nm. The structurally colored pigments based on CB@SiO2@TiO2 nanospheres effectively solve the environmental problems caused by the application of pigments and have a promising future in the fields of color decoration, display, and painting.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Junyang Liu,Zengxi Li,Yuhang Bian,Guoliang Zhang,Jie Li,Gang Wang,Chunshan Li
Synthesis of methyl methacrylate (MMA) by aldol condensation of methyl propionate (MP) with formaldehyde (FA) has received researchers’ attention in recent years. Herein, a kind of acid-base bi-functional Cs/Ti-SiO 2 was developed for the conversion of MP and FA to MMA. A series of Cs/Ti-SiO 2 samples with different acid-base properties were prepared by changing the loading amount of Cs and Ti elements and characterized using XRD, BET, FT-IR, DR UV–vis, SEM, TEM, XPS, CO 2 /NH 3 -TPD, O 2 -TPO, py-IR, and TGA. The introduction of Ti species could significantly regulate the acidity and affect the surface structure of catalyst, facilitating the activation of reactants and aldol reaction effectively. The relationship between the acid-base properties and catalytic activity was correlated, which revealed the crucial role of weak and medium acid sites in this transformative process. The production of MMA was optimized by using response surface methodology (RSM) based on the Box-Behnken design (BBD) approach. As a result, 62.8 % yield of MMA with selectivity of 75.6 % could be achieved at optimal reaction conditions. The catalyst would suffer deactivation from carbon deposition, which could be easily regenerated by simple thermal treatment without any decrease in initial activity during 600 h time-on-stream. Kinetic studies unraveled the activation energy of aldol condensation was 112.2 kJ/mol.
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Materials
·
2023
·Vol. 16
·期 21
·6917
·
IF 3.4
Qi Luo,Jian Yu,Xueshuang Deng,Ming Cao,Shifang Ma,Qiongxin Hua,Dan Xue,Fenghui An
In this study, we aim to minimize light loss and achieve high power conversion efficiencies (PCE) in perovskite solar cells (PSCs) by employing a spectral conversion film component with antireflection properties. In our scheme, NaYF4:Tm, Yb, and Gd luminescent nanorod/silica nanosphere-based thin films are applied on CH3NH3PbI3PSCs to improve the device efficiency. The film was fabricated by spin coating an aged silica sol containing NaYF4:Tm, Yb, and Gd luminescent nanorods. The size and the spectral conversion properties of the NaYF4:Tm, Yb, and Gd luminescent nanorods were controlled by tuning the Gd3+ion concentration. The microstructure and the transmittance properties of the thin film were controlled by changing the concentration of NaYF4:Tm, Yb, and Gd luminescent nanorod in silica sol. The thin films have excellent spectral conversion properties while exhibiting a maximum transmittance. The photovoltaic performance of PSCs with NaYF4:Tm, Yb, and Gd luminescent nanorod/silica nanosphere-based thin films was systematically investigated. The light transmittance was optimized to 95.1% on a cleaned glass substrate, which resulted in an average increase of about 3.0% across the broadband range of 400–800 nm. The optimized films widen the spectrum of light absorbed by conventional PSC cells and reduce reflections across a broad range, enhancing the photovoltaic performance of PSCs. As a result, the PCE of the PSC increased from 14.51% for the reference device without a thin film to 15.67% for the PSC device with an optimized thin film. This study presents a comprehensive solution to the problem of Fresnel reflection and spectral response mismatch of the PSCs, which provides new ideas for the light management of PSCs.Keywords:perovskite solar cells;spectral conversion;NaYF4;antireflection coating;SiO2
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Nanomaterials
·
2020
·Vol. 10
·期 6
·1205
·
IF 4.324
Changbo Zhang,Jiying Xu,Yi Chen
Surface-enhanced Raman scattering (SERS) greatly increases the detection sensitivity of Raman scattering. However, its real applications are often degraded due to the unrepeatable preparation of SERS substrates. Herein presented is a very facile and cost-effective method to reproducibly produce a novel type of SERS substrate, a monolayer photonic crystal (PC). With a building block of laboratory-prepared monodisperse SiO2particles deposited with space-tunable silver nanobulges (SiO2@nAg), a PC substrate was first assembled at the air–water interface through needle tip flowing, then transferred onto a silicon slide by a pulling technique. The transferred monolayer PCs were characterized by SEM and AFM to have a hexagonal close-packed lattice. They could increase Raman scattering intensity by up to 2.2 × 107-fold, as tested with p-aminothiophenol. The relative standard deviations were all below 5% among different substrates or among different locations on the same substrate. The excellent reproducibility was ascribed to the highly ordered structure of PCs, while the very high sensitivity was attributed to the strong hotspot effect caused by the appropriately high density of nanobulges deposited on SiO2particles and by a closed lattice. The PC substrates were validated to be applicable to the SERS assay of trace thiol pesticides. Thiram pesticide is an example determined in apple juice samples at a concentration 102-fold lower than the food safety standard of China. This method is extendable to the analysis of other Raman-active thiol chemicals in different samples, and the substrate preparation approach can be modified for the fabrication of more PC substrates from other metallic nanobulge-deposited particles rather than silica only.Keywords:monolayer photonic crystal;silica particles;silver nanobulge deposition;SERS assay;pesticide determination
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