JOM
·
2021
·Vol. 74
·期 2
·622-633
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IF 2.474
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yu Tian,Zhigang Xu,Yuming Yang,Dan Wang,Zhimin Liu,Xiaoxi Si
In this study, a magnetic composite material was developed by bonding the modified natural polysaccharide chitosan (CTS) with SiO 2 on the surface of magnetic Fe 3 O 4 nanoparticles to detect polychlorinated biphenyls (PCBs). The structural, porosity, and magnetic properties of Fe 3 O 4 @SiO 2 @CTS were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, nitrogen sorption, and vibrating sample magnetometry. Various experimental parameters affecting the extraction capacity were investigated, including extraction time, desorption time, desorption solvent, solution pH value, and salt ion concentration. Results showed that Fe 3 O 4 @SiO 2 @CTS exhibited excellent selectivity, easy separation by magnet, and reusability (at least 10 cycles). Under optimized experimental condition, this magnetic solid phase extraction material was applied to detect three PCBs with low limits of detection of 0.02–0.15 μg·L −1 . The linear correlation coefficient was higher than 0.998, while the recoveries ranged between 90.34% and 106.99% with the relative standard deviation less than 11.31%. The practical application of Fe 3 O 4 @SiO 2 @CTS was verified through quantitative analysis of PCB residues in environmental water, supporting its promising role in simple, convenient, and low-cost detection of PCBs in real environmental samples.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Shengzhong Rong,Lina Zou,Ye Zhu,Ze Zhang,Hongfeng Liu,Yingcong Zhang,Hui Zhang,Hongmin Gao,Hongjun Guan,Jing Dong,Yupeng Guo,Fenghai Liu,Xiaoxia Li,Hongzhi Pan,Dong Chang
Nuclear matrix protein 22 (NMP22) is a crucial bladder cancer marker, the accurate detection of which is conductive to improving the effectiveness of tumor prevention and treatment. However, due to low sensitivity, it is impossible for conventional immunoassay to detect the trace of NMP22 at the early stages of tumor progression. It is crucial to develop a simple, sensitive and accurate detection method of NMP22. As a variety of two-dimensional (2D) material, reduced graphene oxide-tetraethylene pentamine (rGO-TEPA) demonstrates excellent conductivity and contains abundant amino groups. As a sort of 3D material, silica-modified Cu-based metalorganic frameworks deposited silver nanoparticles ( [email protected] 2 @AgNPs) composites are characterized by large surface area, excellent biocompatibility and water stability, which allows the immobilization of anti-NMP22 in large amounts via Ag-N bonds. Through a combination of the advantages exhibited by 2D material, 3D material, AgNPs and disposable screen-printed electrode, a disposable and sensitive label-free electrochemical immunosensor has been successfully assembled for NMP22 detection. In addition to exhibiting a wide linear range (0.1 pg∙mL −1 -1000 ng∙mL −1 ) and a low detection limit (33.33 fg∙mL −1 , S/N = 3), the proposed immunosensor also demonstrated satisfactory selectivity, strong reproducibility and high stability. Moreover, the excellent performance in detecting human urine samples makes it applicable in practice.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Rui Wang,Congzhen Xie,Shoukang Luo,Huasong Xu,Bin Gou,Jiangang Zhou,Hao Yang
Polymer-based dielectric materials with high energy storage performance have become an important part of electric power and electronic systems. But due to the low intrinsic dielectric constant of polymers, it is usually needed to mingle high dielectric constant nanofillers to improve their dielectric properties. However, the addition of nanoparticles often results in higher dielectric loss and lower breakdown strength. Herein, using a simple method of surface modification of BaTiO3, silica and polydopamine are coated on the surface of BaTiO3, significantly improving the dielectric properties of the polymer. Meanwhile, the composite with a sandwich structure is prepared by using BaTiO3@SiO2@PDA/PVDF as the central layer and pure PVDF as the two outer layers, achieving an ultrahigh breakdown strength (633 MV/m). The sandwich-structured composite with 1 wt % BaTiO3@SiO2@PDA has the highest discharge energy density (15.4 J/cm3). The simulation results reveal that the sandwich structure not only acts as an interface carrier barrier but also optimizes the electric field concentration inside the composite, which reduces the probability of electric breakdown. This work can broaden the way for dielectric films to be used in the field of high energy density, and the modification strategy can also provide ideas for other fields.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Li Zhao,Zhiping Du,Xiumei Tai,Yanjun Ma
To achieve effective oil/water separation, one-step facile fabricated hydrophobic SiO2 coated super-hydrophobic/super-oleophilic mesh (FSSM) via an improved Stöber method. Apparent contact angle was characterized by a contact angle meter (CA). SEM, FTIR and XPS were used to characterize the surface morphology and chemical composition of FSSM, individually. The super-hydrophobicity of the membrane was conferred by the multistage rough structure and low surface energy substances produced by the hydrolysis and polycondensation reactions of TEOS , DTMS and TMODS. Meanwhile, the effect of the proportion for silane coupling agents DTMS and TMODS on the hydrophobicity from claiming stainless steel network surfaces was investigated. The results showed that when DTMS: TMODS = 1:9 (n: n), the maximum apparent contact angle of FSSM was 153.3°, while the apparent contact angle of oil was 0°. The C, O and Si elements on the surface of FSSM increased by approximately 21%, 9% and 20% respectively. The FSSM can efficiently separate different oil/water mixtures (about 96%). Furthermore, FSSM showed excellent anti-corrosion (pH from 0 to 14) and remarkable reusability (about 40 cycles) and durability (exposure test at atmosphere for 35 days). The advantages of easy manufacture, stability and low cost of FSSM make it expected to be widely used in the field of oil-water separation.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 35
·15901-15911
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IF 3.591
Xiao-yi Liu,Xiu-ping Li,Rong-xiang Zhao,Hao Zhang
Silica gel containing SnCl2-based deep eutectic solvents (DESs) were synthesized by a sol–gel method using SnCl2-based DESs as the loading component. The n%-SnO2/SiO2 (n = 2, 4, 6) supported catalyst was obtained by calcination of silica gel containing SnCl2-based DESs at high temperature. n%-SnO2/SiO2 was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption and X-ray photoelectron spectroscopy (XPS). A catalytic oxidation desulfurization system with 4%-SnO2/SiO2 as the catalyst and H2O2 as the oxidant was applied to remove organic sulfide in model oil. Compared with the traditional impregnation method, the catalyst synthesized using the sol–gel method showed higher oxidative desulfurization activity. The effects of various factors including loading dose of SnO2, temperature, O/S molar ratio, catalyst dosage, and different sulfides on the desulfurization rate were investigated. The experimental results indicate that the desulfurization rate of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and benzothiophene (BT) can reach 99.5%, 81.6% and 22.4%, respectively, under the optimal reaction conditions. The desulfurization activity of 4%-SnO2/SiO2 is above 90% after recycling 5 times.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 3.475
Yongxing Li,Pengqian Luan,Liya Zhou,Saiguang Xue,Yihang Liu,Yunting Liu,Yanjun Jiang,Jing Gao
The synthesis or decomposition of complex substances through the combination of metals and enzymes is desirable but still a huge challenge. A kind of yolk-shell structured Co/C@SiO 2 @Ni/C nanocomposites were prepared by the polyhedral ZIF-67@SiO 2 composite as a precursor through the extended stöber method and subsequent carbonization treatment. The SiO 2 as an intermediate protective layer stabilized the morphology and structure of the carbonized products. The metallic nickel nanoparticles were uniformly distributed on the surface of Co/C@SiO 2 @Ni/C for highly specific absorption of His-tagged organophosphohydrolase (OpdA) from cell lysates via affinity, and therefore an integrated nanocatalyst (INC) named OpdA@Co/C@SiO 2 @Ni/C was successfully prepared. The prepared INC was applied to achieve a one-pot chemoenzymatic cascade degradation of organophosphates (OPs) to p -aminophenol (PAP) within 30 min. In addition, the INC proved to be a simple and high-sensitivity nanocatalyst for the detection of methyl-parathion with a low limit of detection (0.30 μM). The INC exhibited improved pH stability, thermal stability, SDS resistance, and storage stability compared to that of free enzymes. When OpdA@Co/C@SiO 2 @Ni/C was reused for 7 cycles, the cascade degradation efficiency of methyl-parathion could retain more than 60 %. This study provides a strategy for constructing a multifunctional nanocatalyst, and further demonstrated its potential in biocatalysis, accurate detection of OPs and remediation of environmental pollution.
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EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Qinting Chen,Bin Yang,Mengya Ding,Yang Pan,Jiasheng Qian,Zhengzhi Zheng,Bin Wu,Jibin Miao,Ru Xia,Youlei Tu,You Shi
In this work, SiO 2 @PDA nanoparticles obtained by in - situ coating polydopamine (PDA) on the surface of spherical SiO 2 nanoparticles were adopted to prepare the polyvinylidene fluoride (PVDF) composite films via thermally-induced phase separation (TIPS) method with diphenyl carbonate (DPC) as the diluent. PDA was proved to cover evenly on the surface of SiO 2 nanoparticles, which was favorable to the dispersion of hydrophilic nanoparticles in the matrix. Effect of the presence of SiO 2 @PDA nanoparticles on crystallization behavior, thermal stability, mechanical properties and hydrophilicity of the composite films was intensively investigated. Heterogeneous nucleating effect on the crystallization of PVDF coupled with elevated crystallinity was found upon the incorporation of SiO 2 @PDA without altering the crystal form of PVDF. The rigidity, tensile strength as well as thermal stability of the composite films containing SiO 2 @PDA were significantly improved in comparison to both neat film and those containing unmodified nanoparticles. In addition, the hydrophilicity of PVDF composite films’ surface was remarkably enhanced with an increasing SiO 2 @PDA content, which helped to reduce the protein adsorption of the composite films considerably. The present study would supply an insight into the fabrication of PVDF composite films with desirable performance and capabilities.
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2020
·Vol. 97
·期 2
·398-407
·
IF 2.721
Zhang Huilan,Wang Juan,Zhang Wen,Han Dong,Zhang Aiping
In the paper, a composite TiO 2 /SiO 2 -NHOC-FA was prepared using the coupling method which is a folic acid-targeted silica-coated titanium dioxide. Their structures were characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), X-ray diffraction (XRD), transmission electron microscope (TEM) and zeta potential method. The results showed that the average diameter of the prepared TiO 2 /SiO 2 -NHOC-FA composite is 18 nm, which is spherical. Compared with unmodified TiO 2 , TiO 2 /SiO 2 -NHOC-FA composite had superior water solubility and dispersion, and enhanced its photokilling activity by folic acid-targeted to FR (+) cells. In addition, photocatalytic TiO 2 /SiO 2 -NHOC-FA arrested cell cycle in G2/M phase of MCF-7 cells, resulting in a significant reduction of mitochondrial membrane potential (MMP), and also made the apoptosis rate, ROS components and intracellular calcium concentration increased. It killed the MCF-7 cells through apoptosis pathway. These results for the TiO 2 /SiO 2 -NHOC-FA composite can provide a theoretical basis for the photodynamic development of TiO 2 .
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PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 9
·5077-5087
·
IF 3.119
Guoping Yang,Haopeng Cai,Xiangyu Li,Mengjun Wu,Xue Yin,Haining Zhang,Haolin Tang
Employing electrostatic self-assembly and free radical polymerization, the surface of SiO2 nanospheres was coated with poly(2-acrylamido-2-methylpropanesulfonic acid) (SiO2@PAMPS) bearing strong electron withdrawing sulfonic and amide groups, enhancing the dissociation ability of the lithium salt of the liquid electrolyte and absorbing anions via hydrogen bonds. After SiO2@PAMPS nanospheres were introduced into the polypropylene (PP) membrane (SiO2@PAMPS/PP), the electrolyte affinity and electrolyte uptake of the composite separators were significantly improved. The ionic conductivity of SiO2@PAMPS/PP-18% (where 18% represents the concentration of the solution used for coating) soaked in liquid electrolyte was even 0.728 mS cm−1 at 30 °C, much higher than that of the pristine PP membrane. The LiFePO4/Li half-cell with SiO2@PAMPS/PP-18% had a discharge capacity of 148.10 mA h g−1 and retained 98.67% of the original capacity even after 120 cycles at 0.5C. Even at a rate of 1.0C, the cell capacity could be maintained above 120 mA h g−1. Therefore, a coating formula was developed that could considerably improve the cycling ability and high rate charge–discharge performance of lithium ion batteries.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Cong Liu,Yanhui Li,Qian Duan
A novel hybrid organic/inorganic magnetic and thermal dual-responsive core-shell green photocatalyst zinc-tetracarboxyl-phthalocyanine- g -Fe 3 O 4 @SiO 2 @TiO 2 - g -poly( N -isopropyl acrylamide) had been prepared. Firstly, Fe 3 O 4 @SiO 2 @TiO 2 (FST) was prepared with core-shell structure, then thermosensitive poly( N -isopropylacrylamide) (PNIPAM) immobilized on the surface of 3-(methacryloxypropyl)-trimethoxysilane (MPS) modified FST by radical polymerization. Below the lower critical solution temperature (LCST), PNIPAM was hydrophilic to ensure them disperse uniformly in aqueous solution, and above LCST, PNIPAM became hydrophobic to accelerate the separation of FST from water. Secondly, zinc-tetracarboxyl-phthalocyanine (ZnTcPc) grafted on the surface of FST- g -PNIPAM by ester bonds and sensitized TiO 2 to broaden absorption light range from ultraviolet to visible region to enhance photocatalytic activity. The photocatalytic test revealed that the decomposition rate of Rhodamine B (RhB) came to 91.8% after 60 min with ZnTcPc- g -FST- g -PNIPAM under visible light. When exposed under sun light, the degradation efficiency reached to 96.9%. It meant ZnTcPc- g -FST- g -PNIPAM was more suitable for organic pollutant degradation in nature. In addition, ZnTcPc- g -FST- g -PNIPAM performed efficient synergistic effect of thermal (>LCST) and magnetic responded recovery for reusing. And the degradation rate of RhB under recyclable photocatalyst was reduced 9.6% after 4 cycles. Above all, ZnTcPc- g -FST- g -PNIPAM would be an efficient photocatalyst with magnetic and thermal dual-responsive recovery used in water treatment.
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ACS Applied Bio Materials
·
2019
·
IF 0
Zhixin Li,Jinwei Zhang,Huixing Chen,Xiaocui Huang,Da Huang,Fang Luo,Jian Wang,Longhua Guo,Bin Qiu,Zhenyu Lin
Hyaluronidase (HAase), a specific enzyme of hyaluronic acid (HA), has been reported as a potential tumor biomarker in recent years. Hence, developing some simple, rapid, and sensitive methods for HAase assay is necessary. In this work, a simple and sensitive biosensor constructed by a reliable controlled release system and a mature electrochemiluminescence (ECL) analytical technique has been devised for the quantification of HAase with high efficiency and selectivity. Tris (2,2′-bipyridyl) ruthenium(II) chloride hexahydrate doped SiO2 nanoparticles (Ru@SiO2 NPs), as ECL signal probes, were trapped in the hydrogel fabricated by HA and polyethylenimine evenly and steadily. When HAase existed, the hydrogel was decomposed by HAase, and the Ru@SiO2 NPs escaped from the hydrogel into the supernate. The ECL signal produced from the supernate can be detected and used to characterize HAase concentration. The result showed a good linear relationship between ECL intensity, and HAase concentration ranged from 2 to 60 U/mL and the limit of detection was 2 U/mL. The developed controlled release ECL biosensor has been used for HAase quantification in urine samples with satisfactory results.
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