Adsorption of Cationic Dyes on a Magnetic 3D Spongin Scaffold with Nano-Sized Fe3O4 Cores

The renewable, proteinaceous, marine biopolymer spongin is yet the focus of modern research. The preparation of a magnetic three-dimensional (3D) spongin scaffold with nano-sized Fe3O4 cores is reported here for the first time. The formation of this magnetic spongin–Fe3O4 composite was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA) (TGA-DTA), vibrating sample magnetometer (VSM), Fourier-transform infrared spectroscopy (FTIR), and zeta potential analyses. Field emission scanning electron microscopy (FE-SEM) confirmed the formation of well-dispersed spherical nanoparticles tightly bound to the spongin scaffold. The magnetic spongin–Fe3O4 composite showed significant removal efficiency for two cationic dyes (i.e., crystal violet (CV) and methylene blue (MB)). Adsorption experiments revealed that the prepared material is a fast, high-capacity (77 mg/g), yet selective adsorbent for MB. This behavior was attributed to the creation of strong electrostatic interactions between the spongin–Fe3O4 and MB or CV, which was reflected by adsorption mechanism evaluations. The adsorption of MB and CV was found to be a function of pH, with maximum removal performance being observed over a wide pH range (pH = 5.5–11). In this work, we combined Fe3O4 nanoparticles and spongin scaffold properties into one unique composite, named magnetic spongin scaffold, in our attempt to create a sustainable absorbent for organic wastewater treatment. The appropriative mechanism of adsorption of the cationic dyes on a magnetic 3D spongin scaffold is proposed. Removal of organic dyes and other contaminants is essential to ensure healthy water and prevent various diseases. On the other hand, in many cases, dyes are used as models to demonstrate the adsorption properties of nanostructures. Due to the good absorption properties of magnetic spongin, it can be proposed as a green and uncomplicated adsorbent for the removal of different organic contaminants and, furthermore, as a carrier in drug delivery applications.

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Rapid Recognition of Fatal Cyanide in Water in a Wide pH Range by a Trifluoroacetamido Based Metal-Organic Framework

New Journal of Chemistry ◽

10.1039/d1nj04278e ◽

2021 ◽

Author(s):

Abhijeet Rana ◽

Chiranjib Gogoi ◽

Subhrajyoti Ghosh ◽

Soutick Nandi ◽

Saurav Kumar ◽

...

Keyword(s):

Thermogravimetric Analysis ◽

Terephthalic Acid ◽

Metal Organic Framework ◽

X Ray Diffraction ◽

X Ray ◽

Acid Ligand ◽

Wide Ph Range ◽

Metal Organic ◽

Ph Range ◽

Organic Framework

A new metal-organic-framework (MOF) called UiO-66-NH-COCF3 was prepared using trifluoroacetamido functionalized terephthalic acid ligand. Powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, thermogravimetric analysis (TGA) and Brunauer Emmett-Teller (BET) experiment were...

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A Schiff base-based fluorescent probe for the quick detection of ClO− ions

Canadian Journal of Chemistry ◽

10.1139/cjc-2019-0349 ◽

2020 ◽

Vol 98 (8) ◽

pp. 403-407

Author(s):

Min Zhang ◽

Tao Hu ◽

Changyan Sun ◽

Wenjun Li ◽

Zhidong Chang

Keyword(s):

Schiff Base ◽

Fast Response ◽

Ionization Mass ◽

X Ray Diffraction ◽

Detection Mechanism ◽

Esi Ms ◽

Wide Ph Range ◽

Nuclear Magnetic Resonance Spectrometry ◽

Magnetic Resonance Spectrometry ◽

Ph Range

A new Schiff base 2-hydroxy-5-[(2,7-dihydroxy-1-naphthyl)methylideneamino]benzoic acid (HNMB) has been designed and synthesized. HNMB was characterized by Fourier-transform infrared spectroscopy (FTIR), electrospray ionization mass spectrometry (ESI–MS), nuclear magnetic resonance spectrometry (NMR), and single crystal X-ray diffraction. Fluorescence spectra show that HNMB could be used as a “turn-on” probe to detect ClO− ions from other anions in DMSO/H2O (v/v = 1:1) with a fast response time of 10 s and a low detection limit of 3.6 × 10−7 mol/L. Moreover, the probe could work in a wide pH range of 4–10. The detection mechanism was studied by ESI–MS.

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Synthesis, structure and photocatalytic degradation of organic dyes of a copper(II) metal–organic framework (Cu–MOF) with a 4-coordinated three-dimensional CdSO4 topology

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229619009306 ◽

2019 ◽

Vol 75 (8) ◽

pp. 1053-1059 ◽

Cited By ~ 4

Author(s):

Lin-Lu Qian ◽

Zhi-Xiang Wang ◽

Hai-Xin Tian ◽

Min Li ◽

Bao-Long Li ◽

...

Keyword(s):

Photocatalytic Degradation ◽

Crystal Engineering ◽

Photoelectron Spectroscopy ◽

Organic Dyes ◽

Metal Organic Framework ◽

Three Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Metal Organic ◽

And Storage

Metal–organic frameworks (MOFs) have attracted much interest in the fields of gas separation and storage, catalysis synthesis, nonlinear optics, sensors, luminescence, magnetism, photocatalysis gradation and crystal engineering because of their diverse properties and intriguing topologies. A Cu–MOF, namely poly[[(μ2-succinato-κ2 O:O′){μ2-tris[4-(1,2,4-triazol-1-yl)phenyl]amine-κ2 N:N′}copper(II)] dihydrate], {[Cu(C4H4O4)(C24H18N10)]·2H2O} n or {[Cu(suc)(ttpa)]·2H2O} n , (I), was synthesized by the hydrothermal method using tris[4-(1,2,4-triazol-1-yl)phenyl]amine (ttpa) and succinate (suc2−), and characterized by IR, powder X-ray diffraction (PXRD), luminescence, optical band gap and valence band X-ray photoelectron spectroscopy (VB XPS). Cu–MOF (I) shows a twofold interpenetrating 4-coordinated three-dimensional CdSO4 topology with point symbol {65·8}. It presents good photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB) under visible-light irradiation. A photocatalytic mechanism was proposed and confirmed.

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Bio-template assisted synthesis of porous glutaraldehyde-polyethyleneimine particulate resin for selective copper ion binding and recovery

RSC Advances ◽

10.1039/c8ra00454d ◽

2018 ◽

Vol 8 (22) ◽

pp. 12043-12052 ◽

Cited By ~ 6

Author(s):

Simarpreet Kaur ◽

Ivan Kempson ◽

Haolan Xu ◽

Magnus Nydén ◽

Mikael Larsson

Keyword(s):

High Selectivity ◽

High Capacity ◽

Copper Ion ◽

Precious Metals ◽

Ion Binding ◽

Ion Exchange Resins ◽

Wide Ph Range ◽

Ph Range ◽

Exchange Resins ◽

Template Assisted Synthesis

Porous ion-exchange resins with features of high selectivity, high capacity, fast adsorption kinetics and chemical stability over a wide pH range are attractive for extracting precious metals like copper and upcycling waste.

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Zeolitic Host–Guest Interactions and Building Blocks for the Self-Assembly of Complex Materials

MRS Bulletin ◽

10.1557/mrs2005.269 ◽

2005 ◽

Vol 30 (10) ◽

pp. 713-720 ◽

Cited By ~ 28

Author(s):

Thomas Bein

Keyword(s):

Self Assembly ◽

Electrostatic Interactions ◽

Spatial Organization ◽

Organic Dyes ◽

Three Dimensional ◽

Internal Surface ◽

Building Blocks ◽

Three Dimensional Objects ◽

Surface Areas ◽

Catalyst Systems

AbstractOrdered nanoscale pore systems such as those represented by zeolites offer many opportunities for the design of complex functional systems via self-assembly.With their large internal surface areas and tunable, well-defined crystalline pore structures that allow molecular sieving and ion exchange, zeolites can be adapted for numerous applications. The nanoscale reactors present in zeolite pore systems have been explored as structural templates for the spatial organization of numerous guests. Examples from various fields are discussed, such as the stabilization of organic dyes for the construction of energy transfer and storage systems, the construction of host–guest hybrid catalyst systems, and the encapsulation of conducting or semiconducting nanoscale wires and clusters. More complex, hierarchical forms of nanostructured matter become accessible when zeolite crystals are used as building blocks for the selfassembly of thin films or three-dimensional objects. A combination of weaker and stronger interactions ranging from dispersive forces, hydrogen bonding, and electrostatic interactions to covalent bonding can be used to build functional hierarchical constructs. Several examples and novel applications of such systems will be discussed, including oriented channel systems, chemical sensors, and hierarchical pore systems for catalytic reactions.

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A pH-Adjustable Tissue Clearing Solution That Preserves Lipid Ultrastructures: Suitable Tissue Clearing Method for DDS Evaluation

Pharmaceutics ◽

10.3390/pharmaceutics12111070 ◽

2020 ◽

Vol 12 (11) ◽

pp. 1070

Author(s):

Shintaro Fumoto ◽

Eriko Kinoshita ◽

Keisuke Ohta ◽

Kei-ichiro Nakamura ◽

Tasuku Hirayama ◽

...

Keyword(s):

Spatial Distribution ◽

Three Dimensional ◽

Fluorescent Intensity ◽

Tissue Clearing ◽

Carbocyanine Dyes ◽

Electron Microscopy Level ◽

Wide Ph Range ◽

Ph Range ◽

Clearing Method ◽

And Oxidative Stress

Visualizing biological events and states to resolve biological questions is challenging. Tissue clearing permits three-dimensional multicolor imaging. Here, we describe a pH-adjustable tissue clearing solution, Seebest (SEE Biological Events and States in Tissues), which preserves lipid ultrastructures at an electron microscopy level. Adoption of polyethylenimine was required for a wide pH range adjustment of the tissue clearing solution. The combination of polyethylenimine and urea had a good tissue clearing ability for multiple tissues within several hours. Blood vessels stained with lipophilic carbocyanine dyes were deeply visible using the solution. Adjusting the pH of the solution was important to maximize the fluorescent intensity and suppress dye leakage during tissue clearing. The spatial distribution of doxorubicin and oxidative stress were observable using the solution. Moreover, spatial distribution of liposomes in the liver was visualized. Hence, the Seebest solution provides pH-adjustable, rapid, sufficient tissue clearing, while preserving lipid ultrastructures, which is suitable for drug delivery system evaluations.

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ZIF-67 with Argon annealing treatment for visible light responsive degradation of organic dyes in a wide pH range

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2019.04.062 ◽

2019 ◽

Vol 285 ◽

pp. 13-20 ◽

Cited By ~ 10

Author(s):

Chen Yuan ◽

Pengfei Cheng ◽

Jing Li ◽

Xianlu Gao ◽

Xingsen Gao ◽

...

Keyword(s):

Visible Light ◽

Organic Dyes ◽

Annealing Treatment ◽

Wide Ph Range ◽

Ph Range

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Polyethyleneimine impregnated alginate capsule as a high capacity sorbent for the recovery of monovalent and trivalent gold

Scientific Reports ◽

10.1038/s41598-021-97228-0 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Yub Raj Dangi ◽

John Kwame Bediako ◽

Xiaoyu Lin ◽

Jong-Won Choi ◽

Che-Ryong Lim ◽

...

Keyword(s):

Adsorption Mechanism ◽

Acidic Solution ◽

High Capacity ◽

Uptake Capacity ◽

Acidic Solutions ◽

Prepared Material ◽

New Type ◽

Amine Groups ◽

Ph Range ◽

First Time

AbstractFor the first time, a polyethyleneimine-impregnated alginate capsule (PEIIAC) with a high adsorption capacity is developed for the recovery of monovalent and trivalent gold from an acidic solution. The strategy results in a new type of adsorbent, polyethyleneimine impregnated alginate capsule (PEIIAC) with a core–shell structure having a large number of amine groups as cationic binding site, facilitating maximum uptake of anionic auric chloride. The maximum uptake of PEIIAC was 3078 and 929 mg/g for Au (III) and Au (I), respectively, are recordable compared to other reported adsorbents to date. The as-prepared material was executed to check the sorption efficacy for Au (III) and Au (I) in the pH range of 1–12. With an increment in pH, the uptake capacity for Au (III) increased, while the uptake capacity for Au (I) decreased. The FTIR, XRD, and XPS studies revealed that the gold adsorption mechanism includes ionic interactions and reduction, wherein the amine, hydroxyl, and carboxyl groups are involved. The capsule showed a higher adsorption efficiency than other reported sorbents, making the material applicable in acidic solutions for the recovery of Au (I) and Au (III).

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