scholarly journals A Molecularly Imprinted Fluorescence Sensor Based on the ZnO Quantum Dot Core–Shell Structure for High Selectivity and Photolysis Function of Methylene Blue

ACS Omega ◽  
2020 ◽  
Vol 5 (32) ◽  
pp. 20664-20673
Author(s):  
Rui Wang ◽  
Ming Guo ◽  
Yinglu Hu ◽  
Jianhai Zhou ◽  
Ronghui Wu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Quantum Dot ◽  
Shell Structure ◽  
High Selectivity ◽  
Fluorescence Sensor ◽  
Core Shell ◽  
Molecularly Imprinted ◽  
Core Shell Structure

Core-shell structure and quantum effect of CdSe/HgSe/CdSe quantum dot quantum well

2001 ◽  
Vol 29 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Ling Xu ◽  
Kunji Chen ◽  
Jianming Zhu ◽  
Hongming Chen ◽  
Hongbin Huang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Well ◽  
Shell Structure ◽  
Quantum Effect ◽  
Core Shell ◽  
Cdse Quantum Dot ◽  
Core Shell Structure

scholarly journals Sorption properties of composite materials with a core-shell structure containing layered double hydroxides in the shell

2020 ◽  
Vol 62 (4) ◽  
pp. 62-71
Author(s):  
Evgenia A. Tarasenko ◽  
◽  
Irina G. Ryltsova ◽  
Maksim N. Yapryntsev ◽  
Yevgenia Yu. Nakisko ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Composite Materials ◽  
Sorption Capacity ◽  
Shell Structure ◽  
Congo Red ◽  
Sorption Properties ◽  
Core Shell ◽  
Order Kinetic ◽  
Anionic Dyes ◽  
Core Shell Structure

The work is devoted to the study of the sorption properties of hierarchical composite materials with a core-shell structure. The composites contained a core of SiO2 or Fe3O4@SiO2 obtained by sol-gel synthesis, on the surface of which a layered double hydroxide (MgAlFe-LDH) was deposited. The phase composition of the obtained materials was determined, and the textural characteristics and particle morphology were studied. It was found that hierarchical materials had larger surface and demonstrated high sorption capacity towards both cationic and anionic dyes in aqueous solution in comparison with individual systems (SiO2 and MgAlFe-LDH). It was shown that the sorption equilibrium in the system “dye solution – sorbent” for dye methylene blue was achieved faster in comparison with Congo red. The obtained kinetic data were analyzed using chemical kinetic models. The sorption of both Congo red and methylene blue on composite materials was found to be described by a pseudo-second order kinetic equation. Isotherms of sorption of Congo red and methylene blue on synthesized materials were plotted. The sorption capacity of Fe3O4@SiO2@LDH and SiO2@LDH towards Congo red were 0.19 mmol/g and 0.27 mmol/g, respectively. In the case of sorption of methylene blue, the sorption isotherms did not reach a plateau in the studied concentration range. However, it can be noted that at an initial methylene blue concentration of 0.051 mmol/L the sorption capacity of Fe3O4@SiO2@LDH and SiO2@LDH were 0.040 mmol/g and 0.033 mmol/g, respectively. The obtained data indicate that hierarchical composite materials containing LDH in their composition are effective bifunctional sorbents and can uptake both anionic and cationic forms of pollutants from a solution. An advantage of the Fe3O4 core system is its ability to be easily separate from a solution under the influence of an external magnetic field. It is important that the Fe3O4@SiO2@LDH sample exhibits a typical superparamagnetic behavior with zero coercitivity and residual magnetic induction.

Fabrication and evaluation of molecularly imprinted magnetic nanoparticles for selective recognition and magnetic separation of lysozyme in human urine

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5849-5856 ◽  
Author(s):  
Zulei Zhang ◽  
Hongmei Wang ◽  
Hailong Wang ◽  
Cuichen Wu ◽  
Mengli Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Magnetic Separation ◽  
Human Urine ◽  
Shell Structure ◽  
Good Stability ◽  
Selective Recognition ◽  
Core Shell ◽  
Molecularly Imprinted ◽  
Core Shell Structure

The Lyz-MMIPs displayed a uniform core–shell structure, favorable magnetic properties, good accessibility, and good stability and had a good affinity and excellent binding selectivity to Lyz.

scholarly journals PEGylated Thermo-Sensitive Bionic Magnetic Core-Shell Structure Molecularly Imprinted Polymers Based on Halloysite Nanotubes for Specific Adsorption and Separation of Bovine Serum Albumin

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 536 ◽  
Author(s):  
Xiufang Li ◽  
Hui Liu ◽  
Zhiwei Deng ◽  
Wenqing Chen ◽  
Tianhao Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Bovine Serum Albumin ◽  
Adsorption Capacity ◽  
Molecularly Imprinted Polymers ◽  
Shell Structure ◽  
Magnetic Core ◽  
Core Shell ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
Core Shell Structure

Novel PEGylated thermo-sensitive bionic magnetic core-shell structure molecularly imprinted polymers (PMMIPs) for the specific adsorption and separation of bovine serum albumin (BSA) were obtained via a surface-imprinting technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), fourier transform infrared spectrometry (FT-IR), thermal gravimetric analysis (TGA), and specific surface area (BET), were adopted to demonstrate that novel PMMIPs were successfully synthesized. Subsequently, the prepared PMMIPs were used as the extractor for BSA and were combined with magnetic solid-phase extraction. The concentrations of BSA were detected by UV-vis spectrophotometry at 278 nm. The maximum adsorption capacity of the PMMIPs was 258 mg g−1, which is much higher than that of non-imprinted polymer (PMNIPs). PMMIPs showed favorable selectivity for BSA against reference proteins, i.e., bovine hemoglobin, ovalbumin and lysozyme. PMMIPs were further used to recognize BSA in protein mixtures, milk, urine and sewage, these results revealed that approximately 96% of the ideal-state adsorption capacity of PMMIPs for BSA was achieved under complicated conditions. Regeneration and reusability studies demonstrated that adsorption capacity loss of the PMMIPs was not obvious after recycling for four times. Facile synthesis, excellent adsorption property and efficient selectivity for BSA trapping are features that highlight PMMIPs as an attractive candidate for biomacromolecular purification.

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