scholarly journals Preparation Method of Iron Oxyhydroxide Nanosheets for Treating Organic Dyes

2022 ◽  
Vol 2152 (1) ◽  
pp. 012043
Author(s):  
Weijie Lian ◽  
Lan Ma ◽  
Bo Chen ◽  
Yuxin Zhai ◽  
Yibo Wen
Keyword(s):  
Congo Red ◽  
Preparation Method ◽  
Organic Dyes ◽  
Molar Ratio ◽  
Dye Wastewater ◽  
Iron Oxyhydroxide ◽  
Adsorption Efficiency ◽  
Strong Adsorption ◽  
Efficiency Increase ◽  
Low Dosage

Abstract Considering the promoted purification requirement for industry sewage, the discharge of azo dye wastewater will have a serious impact on the environment, iron oxyhydroxide nanosheets were designed and prepared, and the purification effects and application conditions were investigated in this work. We have used its structural advantages to perform adsorption tests on Congo red (CR). It found that it has very excellent properties. It has strong adsorption capacity for Congo red under the condition of low dosage and no adjustment of PH. By employing iron oxyhydroxide nanosheets with optimized molar ratio of reducing agent to Fe, it was found that the adsorption efficiency increase in the removal percentage for CR from industry sewage could be achieved at the large specific surface area and pore volume of B-Fe Nanosheets.

Quantum Dot Bioconjugates as Energy Donors in Fluorescence Resonance Energy Transfer Assays

2003 ◽  
Vol 773 ◽  
Author(s):  
Aaron R. Clapp ◽  
Igor L. Medintz ◽  
J. Matthew Mauro ◽  
Hedi Mattoussi
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Genetically Engineered ◽  
Molar Ratio ◽  
Binding Assays ◽  
Specific Sequence ◽  
Donor Acceptor

AbstractLuminescent CdSe-ZnS core-shell quantum dot (QD) bioconjugates were used as energy donors in fluorescent resonance energy transfer (FRET) binding assays. The QDs were coated with saturating amounts of genetically engineered maltose binding protein (MBP) using a noncovalent immobilization process, and Cy3 organic dyes covalently attached at a specific sequence to MBP were used as energy acceptor molecules. Energy transfer efficiency was measured as a function of the MBP-Cy3/QD molar ratio for two different donor fluorescence emissions (different QD core sizes). Apparent donor-acceptor distances were determined from these FRET studies, and the measured distances are consistent with QD-protein conjugate dimensions previously determined from structural studies.

scholarly journals Efficient Congo Red Removal Using Porous Cellulose/Gelatin/Sepiolite Gel Beads: Assembly, Characterization, and Adsorption Mechanism

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3890
Author(s):  
Chenlu Jiao ◽  
Die Liu ◽  
Nana Wei ◽  
Jiannan Gao ◽  
Fan Fu ◽  
...  
Keyword(s):  
Congo Red ◽  
Adsorption Mechanism ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Dye Wastewater ◽  
Step Method ◽  
Gel Beads ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Highly Porous

Porous sustainable cellulose/gelatin/sepiolite gel beads were fabricated via an efficient ‘hydrophilic assembly–floating droplet’ two-step method to remove Congo red (CR) from wastewater. The beads comprised microcrystalline cellulose and gelatin, forming a dual network framework, and sepiolite, which acted as a functional component to reinforce the network. The as-prepared gel beads were characterized using FTIR, SEM, XRD, and TGA, with the results indicating a highly porous structure that was also thermally stable. A batch adsorption experiment for CR was performed and evaluated as a function of pH, sepiolite addition, contact time, temperature, and initial concentration. The kinetics and isotherm data obtained were in agreement with the pseudo-second-order kinetic model and the Langmuir isotherm, with a maximum monolayer capacity of 279.3 mg·g−1 for CR at 303 K. Moreover, thermodynamic analysis demonstrated the spontaneous and endothermic nature of the dye uptake. Importantly, even when subjected to five regeneration cycles, the gel beads retained 87% of their original adsorption value, suggesting their suitability as an efficient and reusable material for dye wastewater treatments.

scholarly journals Bioremediation of organic dyes using combination of plants ash

2019 ◽  
Vol 7 (2) ◽  
pp. 240-246
Author(s):  
Kaur Harpreet ◽  
Kaur Harpreet ◽  
Vandana Kamboj ◽  
Vandana Kamboj
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Crystal Violet ◽  
Congo Red ◽  
Organic Dyes ◽  
Low Cost ◽  
Sem Image ◽  
Orange Peels

Water is the most crucial thing to mankind and so its contamination by various agencies is posing a threat to the natural balance. So, in the present work, the efficiency of various adsorbents derived from plant waste, to remove different dyes from aqueous solution was evaluated. Parameters for study were contact time, concentration and pH. Various combinations of plant ashes were used for the study. It was found that adsorbent prepared from the combination of orange peels, pomegranate and banana peels ashes, exhibited good adsorption capacity for methylene blue, congo red and crystal violet. All these dyes were completely removed from the aqueous solution while methyl orange was not removed. Congo red was removed completely within 40 min of contact with the adsorbent while methyl orange took 3 hrs to be removed to the extent of 48% only. The adsorption coefficient of congo red was found to be 2.33 while value for methylene blue and crystal violet was 1 and 1.66 respectively. The characterization of adsorbent was done by Scanning Electron Microscopy and IR spectroscopy. SEM image revealed the surface of adsorbent to be made of differential pores. From the results it became evident that the low-cost adsorbent could be used as a replacement for costly traditional methods of removing colorants from water.

scholarly journals Photocatalytical Degradation of Congo Red Azo Dye Using Phosphono-Aminoacid-Cd(II) Pendant Groups Grafted on a Polymeric Support

2019 ◽  
Vol 70 (10) ◽  
pp. 3473-3476 ◽  
Author(s):  
Laura Cocheci ◽  
Lavinia Lupa ◽  
Aniela Pop ◽  
Aurelia Visa ◽  
Bianca Maranescu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Azo Dye ◽  
Organic Dyes ◽  
Degradation Process ◽  
Polymer Support ◽  
Polymeric Support ◽  
Vis Spectroscopy ◽  
Red Dye ◽  
Scanning Electron

In the present study, a new compound was used for decontaminating water polluted by Congo Red dye. Phosphono-aminoacid-Cd(II) pendant groups grafted on a polymeric support was prepared using impregnation of a polymer support functionalized with phosphono-aminoacid groups with an aqueous solution of Cd(NO3)2x4H2O. The catalyst was characterized by Fourier transform infrared ray, scanning electron microscope, termogravimetric analysis UV-Vis spectroscopy. The results suggest that the studied material could efficiently be used as photocatalyst in the degradation process of waters containing organic dyes under UV-Vis light irradiation.

Synthesis of metal organic framework modified with carboxylated attapulgite and adsorption properties for organic dye

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fanhua Wu ◽  
Yuyu Zhang ◽  
Tao Li ◽  
Yongfeng Liu ◽  
Yi Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hybrid Materials ◽  
Congo Red ◽  
Metal Organic Framework ◽  
Adsorption Efficiency ◽  
Anionic Dyes ◽  
Content Type ◽  
Low Concentration ◽  
Metal Organic ◽  
The Cost

Purpose The purpose of this study was to prepare carboxylated attapulgite (APT-COOH) and then be used as one of the ligands to prepare metal organic framework (MOF) hybrid materials to reduce the cost of MOF materials and improve the dispersed condition of APT. And then the materials were used to enrich anionic dye Congo red from aqueous solution. Design/methodology/approach The MOF hybrid materials were designed by means of facile reflux method rather than hydrothermal method, characterized by Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectrometer and pore structure. The dispersed degree of APT-COOH in the MOF materials was validated according to adsorption efficiency for Congo red. Findings Due to introduction of APT-COOH, the microenvironment of the MOF materials changed, leading to different adsorption behaviors. Compared to the MOF material without APT-COOH, the adsorption capacities of the hybridized MOF materials with different amounts of APT-COOH introduced increased by 4.58% and 15.55%, respectively, as the initial concentration of Congo red solution of 300 mg/L. Meantime, hybridized MOF materials were suitable to remove Congo red with low concentration, while the MOF material without APT-COOH was appropriate to enrich Congo red with high concentration. Research limitations/implications The microstructure of MOF hybrid materials in detail is the further and future investigation. Practical implications This study will provide a method to reduce the cost of MOF materials and a theoretical support to treat anionic dyes from aqueous solution. Originality/value APT-COOH was prepared and used as one of the ligands to synthesize MOF material to improve the dispersed degree of APT-COOH and reduce the cost of the MOF materials. The adsorption efficiency was greatly enhanced with low concentration of Congo red solution, and the results indicated that hydrogen bonding, electrostatic interaction, and p-p conjugation were involved in the adsorption process. The prepared MOFs materials exhibited excellent adsorption efficiency, which made the present materials highly promising and potentially useful in practical application as adsorbents to enrich anionic dyes such as Congo red from aqueous solution.

Nanomaterial Surface Modifications for Enhancement of the Pollutant Adsorption From Wastewater

2019 ◽  
pp. 143-170 ◽  
Author(s):  
Hamidreza Sadegh ◽  
Gomaa A. M. Ali ◽  
Hamid Jafari Nia ◽  
Zahra Mahmoodi
Keyword(s):  
Membrane Filtration ◽  
Organic Dyes ◽  
Low Cost ◽  
Aquatic Organisms ◽  
Chemical Degradation ◽  
Photochemical Degradation ◽  
Dye Wastewater ◽  
Biological Degradation ◽  
Operation Costs ◽  
Global Concern

With the development of dyeing, textile, leather, paper, and other chemical industries, an increasing amount of dye wastewater containing refractory organic dyes is discharged. Undoubtedly, much high content dye wastewater will lead to serious environmental issues such as color pollution, light penetration interference, and virulence to aquatic organisms, even endanger human health. Therefore, it is an imminent problem and has become a global concern to degrade dye wastewater efficiently. So far, many techniques have been used to degrade dyeing wastewater, such as chemical degradation, biological degradation, photochemical degradation, coagulation, membrane filtration, and combined methods. These methods have certain impacts on the degradation of dye wastewater, but usually with slow degradation rate, complex and high operation costs, as well as easily causing secondary pollution. The adsorption process is a simple, effective, and low-cost way to remove dyes.

scholarly journals Evaluation of Mg/Al Layered Double Hydroxides as Adsorbent Material for Adsorptive Removal of Congo Red (Acid Red 28) Azodye from Aqueous Solution

2020 ◽  
Vol 32 (9) ◽  
pp. 2381-2388
Author(s):  
LAM VAN TAN ◽  
HONG THAM NGUYEN THI ◽  
TO UYEN DAO THI ◽  
VAN THUAN TRAN
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxides ◽  
Congo Red ◽  
Organic Dyes ◽  
Synthesis Temperature ◽  
Inorganic Layer ◽  
Adsorptive Removal ◽  
Ft Ir ◽  
Ir Analysis ◽  
Double Hydroxides

The use of inorganic layer compounds as adsorbents for organic dyes in water treatment is of increasing interest. In this study, an attempt is made for the synthesis of Mg/Al LDHs by the hydrothermal method. The synthesis temperature was found to significantly affect to the structure of layered double hydroxides (LDHs), as pointed out by FT-IR analysis. In addition, an adsorption capacity of the synthesized LDHs against Congo red in aqueous solutions was investigated and also compared the adsorption results with other dyes such as methylene blue and methyl orange.

Improved adsorption of Congo red by nanostructured flower-like Fe(II)–Fe(III) hydroxy complex

2018 ◽  
Vol 78 (3) ◽  
pp. 506-514
Author(s):  
Xiaoyan Sun ◽  
Zhongwu Liu ◽  
Zhigang Zheng ◽  
Hongya Yu ◽  
Dechang Zeng
Keyword(s):  
Adsorption Capacity ◽  
Anion Exchange ◽  
Electrostatic Interaction ◽  
Congo Red ◽  
Removal Rate ◽  
Superior Performance ◽  
Facile Synthesis ◽  
Similar Reduction ◽  
Microwave Assisted ◽  
Strong Adsorption

Abstract Amorphous Fe(II)–Fe(III) hydroxy complex with flower-like nanostructure was synthesized by ferric reduction using a microwave-assisted ethylene glycol approach. Here we investigated the correlation between its chemical composition and the removal rate for Congo red (CR) dye. The results showed that the amorphous complex had similar reduction and anion exchange capacities to the green rust. Due to the synergistic effect of attractive electrostatic interaction, anion exchange, ferrous redox and hydrogen bonding, the Fe(II)–Fe(III) hydroxy complex exhibited strong adsorption of CR with an estimated adsorption capacity up to 513 mg g−1. In contrast, the Fe(III) hydroxy complex had an adsorption capacity of 296 mg g−1 because of the predominant mechanism based on the electrostatic interaction. The present study provides a facile synthesis of nanostructured iron hydroxy complex, with superior performance in adsorbing CR.

scholarly journals Zwitterionic superabsorbent polymer hydrogels for efficient and selective removal of organic dyes

RSC Advances ◽  
2019 ◽  
Vol 9 (32) ◽  
pp. 18565-18577 ◽  
Author(s):  
Tanzil Ur Rehman ◽  
Luqman Ali Shah ◽  
Mansoor Khan ◽  
Muhammad Irfan ◽  
Noor Saeed Khattak
Keyword(s):  
Free Radical ◽  
Aqueous Medium ◽  
Radical Polymerization ◽  
Crystal Violet ◽  
Congo Red ◽  
Organic Dyes ◽  
Selective Removal ◽  
Superabsorbent Polymer ◽  
Polymer Hydrogel ◽  
Polymer Hydrogels

A novel zwitterionic superabsorbent polymer hydrogel [ZI-SAH] was synthesized by free radical polymerization and used for the removal of crystal violet (CV) and congo red (CR) from an aqueous medium.

scholarly journals Suppression by polycyclic compounds of the conversion of human amylin into insoluble amyloid

2003 ◽  
Vol 374 (3) ◽  
pp. 779-784 ◽  
Author(s):  
Jacqueline F. AITKEN ◽  
Kerry M. LOOMES ◽  
Barbara KONARKOWSKA ◽  
Garth J. S. COOPER
Keyword(s):  
Acridine Orange ◽  
Congo Red ◽  
Type Ii Diabetes Mellitus ◽  
Significant Inhibition ◽  
Molar Ratio ◽  
Amyloid Formation ◽  
Islet Amyloid ◽  
Polycyclic Compounds ◽  
Molar Excess ◽  
Human Amylin

There is a significant correlation between the occurrence of pancreatic islet amyloid and β-cell failure in advanced type II diabetes mellitus. Islet amyloid is composed primarily of the fibrillar form of the pancreatic hormone, amylin. Using thioflavin-T fluorescence binding and radioprecipitation assays, we investigated whether or not a series of small tricyclic compounds, tetracycline or Congo Red could interfere with the conversion of synthetic human amylin into its insoluble amyloid form. Of the compounds investigated, incubation of human amylin with a 20-fold molar excess of either Congo Red or Acridine Orange resulted in significant inhibition in the rate of amyloid formation. With Congo Red, maximal inhibition effectively occurred at a 1:1 molar ratio or greater over human amylin, whereas inhibition by Acridine Orange was dose-dependent. A 20-fold molar excess of the compound tetracycline also decreased insoluble amyloid content after extended incubation periods of approx. 20 h. Amyloid fibril morphology in the presence of tetracycline, as measured by transmission electron microscopy, was characterized by short fragmented fibrils compared with the longer and denser appearance of fibrils formed by amylin alone. These findings show that polycyclic compounds can suppress the formation of amyloid by human amylin, providing support for an alternative approach to peptide-based strategies by which islet amyloid formation could be modulated.

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