One‐step synthesis of amino‐functionalised magnetic mesoporous silica and synergistic adsorption kinetics of tetracycline and copper

2018 ◽  
Vol 13 (8) ◽  
pp. 1219-1223 ◽  
Author(s):  
Mancheng Zhang ◽  
Wei Wang ◽  
Zengyin Zhu ◽  
Changsheng Qu ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Adsorption Kinetics ◽  
One Step ◽  
Kinetics Of ◽  
Magnetic Mesoporous Silica

Adsorption Kinetics of Cellulase and Xylanase Immobilized on Magnetic Mesoporous Silica

2019 ◽  
Vol 42 (9) ◽  
pp. 1825-1833 ◽  
Author(s):  
Nurul Jannah Sulaiman ◽  
Azmi Fadziyana Mansor ◽  
Roshanida A. Rahman ◽  
Rosli M. Illias ◽  
Shalyda M. Shaarani
Keyword(s):  
Mesoporous Silica ◽  
Adsorption Kinetics ◽  
Kinetics Of ◽  
Magnetic Mesoporous Silica

Magnetic Mesoporous Silica/Chitosan/Polyproline: A Novel Nanocomposite Toward Sensing of Some Clinically Relevant Biomolecules

Nano LIFE ◽  
2017 ◽  
Vol 07 (03n04) ◽  
pp. 1750006 ◽  
Author(s):  
Mohammad Hasanzadeh ◽  
Soodabeh Hassanpour ◽  
Arezoo Saadati ◽  
Nasrin Shadjou ◽  
Ahad Mokhtarzadeh
Keyword(s):  
Mesoporous Silica ◽  
Surface Coverage ◽  
Linear Sweep Voltammetry ◽  
Differential Pulse ◽  
One Step ◽  
Pulse Voltammetry ◽  
Small Biomolecules ◽  
Magnetic Mesoporous Silica ◽  
Mcm 41

In this paper, free-radical polymerization inside magnetic mesoporous silica has been investigated in order to open a route to functional polymer–silica composite nanomaterials with well-defined mesoporosity. Proline monomers integrated with chitosan (CS) were electropolymerized into amino-functionalized magnetic mesoporous silica. The fabrication of polyproline-amino-functionalized magnetic mesoporous silica–CS nanohybrid on glassy carbon electrode (GCE) was performed using one step electrodeposition regime. Field emission scanning electron microscopy (FE-SEM) was confirmed as produced nanohybrid material containing polyproline (PPR) into the pores of magnetic (Fe3O[Formula: see text] mobile crystalline material-41 grafted with 3-aminopropyl groups (MMS) which leads to increase of surface coverage of PPR. The results indicate that PPR was successfully generated inside the pores of the amino-functionalized Mobil Composition of Matter No. 41 (nPrNH2-MCM-41) and that the amine group was capable of protonating the polymer, producing polyproline, the most conductive one, without the addition of another acid source during the polymerization step. Therefore, it was evaluated some electrochemical aspects of the prepared nanohybrid using cyclic voltammetry, differential pulse voltammetry and linear sweep voltammetry. Finally, the electroactivity of polyproline -Fe3O4-nPrNH2-MCM-41-chitosan nanohybrid (PPR-MMS-CS) modified GCE toward detection and determination of some clinically relevant small biomolecules was studied.

scholarly journals One-Step Preparation of Phenyl Boron-Modified Magnetic Mesoporous Silica for Selective Enrichment of cis-Diol-Containing Substances

Molecules ◽  
2018 ◽  
Vol 23 (3) ◽  
pp. 603 ◽  
Author(s):  
Hua Fu ◽  
Jing Hu ◽  
Min Zhang ◽  
Yuerong Wang ◽  
Hongyang Zhang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Selective Enrichment ◽  
One Step ◽  
Magnetic Mesoporous Silica

scholarly journals 4-Nitrophenol-Loaded Magnetic Mesoporous Silica Hybrid Materials for Spectrometric Aptasensing of Carcinoembryonic Antigen

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1138
Author(s):  
Jin Zhang ◽  
Dianping Tang
Keyword(s):  
Mesoporous Silica ◽  
Carcinoembryonic Antigen ◽  
Dynamic Range ◽  
High Specificity ◽  
Enzyme Linked Immunosorbent Assay ◽  
Multiple Reactions ◽  
One Step ◽  
Hybridization Reaction ◽  
Magnetic Mesoporous Silica

Aptamer- or antibody-based sensing protocols have been reported for detecting carcinoembryonic antigen (CEA), but most exhibit complicated procedures or multiple reactions. In this work, we developed a one-step aptasensing protocol for the spectrometric determination of CEA based on 4-nitrophenol (4-NP)-loaded magnetic mesoporous silica nanohybrids (MMSNs) for bioresponsive controlled-release applications. To fabricate such a responsive–controlled sensing system, single-stranded complementary oligonucleotides relative to the CEA-specific aptamer were first modified on the aminated MMSN. Thereafter, 4-NP molecules blocked the pores with the assistance of the aptamers via a hybridization reaction. The introduced target CEA specifically reacted with the hybridized aptamer, thus detaching from the MMSN to open the gate. The loaded 4-NP molecules were released from the pores, as determined using ultraviolet–visible (UV–vis) absorption spectroscopy after magnetic separation. Under optimum conditions, the absorbance increased with an increase in the target CEA in the sample and exhibited a good linear relationship within the dynamic range of 0.1–100 ng mL−1, with a detection limit of 46 pg mL−1. Moreover, this system also displayed high specificity, good reproducibility, and acceptable accuracy for analyzing human serum specimens, in comparison with a commercialized human CEA-enzyme-linked immunosorbent assay (ELISA) kit.

Adsorption Kinetics of Diblock Copolymers from a Micellar Solution on Silica and Titania

1998 ◽  
Vol 31 (26) ◽  
pp. 9281-9294 ◽  
Author(s):  
H. D. Bijsterbosch ◽  
M. A. Cohen Stuart ◽  
G. J. Fleer
Keyword(s):  
Adsorption Kinetics ◽  
Micellar Solution ◽  
Diblock Copolymers ◽  
Kinetics Of ◽  
Silica And Titania

scholarly journals Fabrication of the magnetic mesoporous silica Fe-MCM-41-A as efficient adsorbent: performance, kinetics and mechanism

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yige Guo ◽  
Bin Chen ◽  
Ying Zhao ◽  
Tianxue Yang
Keyword(s):  
Mesoporous Silica ◽  
Zero Valent Iron ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Environment And Health ◽  
Transmission Electron ◽  
Order Kinetic Model ◽  
Neutral Conditions ◽  
Magnetic Mesoporous Silica ◽  
Mcm 41

AbstractAntibiotics are emerging pollutants and increasingly present in aquaculture and industrial wastewater. Due to their impact on the environment and health, their removal has recently become a significant concern. In this investigation, we synthesized nano zero-valent iron-loaded magnetic mesoporous silica (Fe-MCM-41-A) via precipitation and applied the adsorption of oxytetracycline (OTC) from an aqueous solution. The effects of competing ions such as Na+, Ca2+ and Cu2+ on the adsorption process under different pH conditions were studied in depth to providing a theoretical basis for the application of nanomaterials. The characterization of the obtained material through transmission electron microscopy demonstrates that the adsorbent possesses hexagonal channels, which facilitate mass transfer during adsorption. The loaded zero-valent iron made the magnetic, and was thus separated under an applied magnetic field. The adsorption of OTC onto Fe-MCM-41-A is rapid and obeys the pseudo-second-order kinetic model, and the maximum adsorption capacity of OTC is 625.90 mg g−1. The reaction between OTC and Fe-MCM-41-A was inner complexation and was less affected by the Na+. The effect of Ca2+ on the adsorption was small under acidic and neutral conditions. However, the promotion effect of Ca2+ increased by the increase of pH. Cu2+ decreased the removal efficiencies continuously and the inhibitory effects decrease varied with the increase of pH. We propose that surface complexing, ion-exchange, cationic π-bonding, hydrogen bonding, and hydrophobicity are responsible for the adsorption of OTC onto Fe-MCM-41-A.

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