Functionalization of Congo red dye as a light harvester on solar cell

AbstractThe demands of ecofriendly technologies to produce a reliable supply of renewable energy on a large scale remains a challenge. A solar cell based on DSSC (Dye-Sensitized Solar Cell) technology is environmentally friendly and holds the promise of a high efficiency in converting sunlight into electricity. This manuscript describes the development of a light harvester system as a main part of a DSSC. Congo red dye has been functionalized with metals (Fe, Co, Ni), forming a series of complexes that serve as a novel light harvester on the solar cell. Metal-congo red complexes have been characterized by UV-VIS and FTIR spectroscopy, and elemental analyses. The performance of metal complexes in capturing photons from sunlight has been investigated in a solar cell device. The incorporation of metals to congo red successfully improved of the congo red efficiency as follows: Fe(II)-congo red, Co(II)-congo red and Ni(II)-congo red had efficiencies of 8.17%, 6.13% and 2.65%, respectively. This research also discusses the effect of metal ions on the ability of congo red to capture energy from sunlight.

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Removal of Congo red dye from aqueous solutions using a halloysite-magnetite-based composite

Water Science & Technology ◽

10.2166/wst.2016.060 ◽

2016 ◽

Vol 73 (9) ◽

pp. 2132-2142 ◽

Cited By ~ 13

Author(s):

F. Ferrarini ◽

L. R. Bonetto ◽

Janaina S. Crespo ◽

M. Giovanela

Keyword(s):

Aqueous Solutions ◽

Adsorption Kinetics ◽

Congo Red ◽

Contact Time ◽

High Efficiency ◽

Dye Adsorption ◽

Order Model ◽

Congo Red Dye ◽

Pseudo Second Order ◽

Red Dye

Adsorption has been considered as one of the most effective methods to remove dyes from aqueous solutions due to its ease of operation, high efficiency and wide adaptability. In view of all these aspects, this study aimed to evaluate the adsorption capacity of a halloysite-magnetite-based composite in the removal of Congo red dye from aqueous solutions. The effects of stirring rate, pH, initial dye concentration and contact time were investigated. The results revealed that the adsorption kinetics followed the pseudo-second-order model, and equilibrium was well represented by the Brunauer–Emmett–Teller isotherm. The thermodynamic data showed that dye adsorption onto the composite was spontaneous and endothermic and occurred by physisorption. Finally, the composite could also be regenerated at least four times by calcination and was shown to be a promising adsorbent for the removal of this dye.

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Photophysical and Electronic Properties of Congo Red Dye Embedded in Polyvinyl Alcohol as an Efficient Laser Optical Limiter: Enhancement the Electrical Conductivity and Dielectric Properties

10.21203/rs.3.rs-1070770/v1 ◽

2021 ◽

Author(s):

M.I. Mohammed ◽

Mohammed Al-Assiri ◽

H.Y. Zahran ◽

T.H AlAbdulaal ◽

Farid A. Harraz ◽

...

Keyword(s):

Electrical Conductivity ◽

Congo Red ◽

Large Scale ◽

Electronic Device ◽

Composite Films ◽

Polymeric Composite ◽

Optical Limiting ◽

Casting Technique ◽

Congo Red Dye ◽

Red Dye

Abstract High-quality polymeric composite films containing Congo red dye and PVA were prepared using the casting technique. The proposed Cr-doped PVA composites were examined using XRD, UV–visible optical, dielectric, and optical limiting effect techniques. The XRD patterns of CR-doped PVA composite films display diffraction peaks, which belong to CR organic dye. There was a broadening and reduction of the initial peak intensity in polymer composite films at higher doping concentrations. The band edge of CR: PVA composites reduced with a massive shift from 4.63 eV to 1.86 e, were Congo red controls the energy bandgap of the PVA polymer. Dielectric permittivity diminishes with increasing the frequency and achieves constant values at higher frequencies through the relation between the electric dipole and the electric field differences. Increasing the percentage ratio of the CR doping enhances the electrical conductivity and dielectric permittivities due to the large size of the CR molecules. The strong optical limiting of the CR-doped PVA composites is determined using different laser sources of 632.8 and 532 nm wavelengths. The amazing obtained results imply that CR: PVA composite films are very significant for applying large-scale CUT-OFF laser filters for medical optical and electronic device systems.

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Evaluation of sugar-cane bagasse as bioadsorbent in the textile wastewater treatment contaminated with carcinogenic congo red dye

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132010000400023 ◽

2010 ◽

Vol 53 (4) ◽

pp. 931-938 ◽

Cited By ~ 27

Author(s):

Aline Sartório Raymundo ◽

Romina Zanarotto ◽

Marciela Belisário ◽

Madson de Godoi Pereira ◽

Joselito Nardy Ribeiro ◽

...

Keyword(s):

Sugar Cane ◽

Congo Red ◽

High Efficiency ◽

Textile Wastewater ◽

Sugar Cane Bagasse ◽

Maximum Adsorption Capacity ◽

Flow Rates ◽

Congo Red Dye ◽

Textile Wastewater Treatment ◽

Red Dye

A methodology involving sugar cane bagasse bioadsorbent was developed in order to remove the carcinogenic congo red dye from aqueous medium. The results showed high efficiency with retention of 64 ± 6% in synthetic congo red solution and 94 ± 5% in effluent enriched with congo red, at 10.0 g of the bioadsorbent. The adsorption system provided a maximum adsorption capacity of 4.43 mg/g. Tests showed independence adsorption properties, when compared with the column flow rates. The treatment units could be operated with flexibility. From the results, it was possible to conclude that sugar cane bagasse could be an adequate bioadsorbent.

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An effective method for determining the retention and distribution of cellulose nanofibrils in paper handsheets by dye labeling

TAPPI Journal ◽

10.32964/tj17.03.157 ◽

2018 ◽

Vol 17 (03) ◽

pp. 157-164 ◽

Cited By ~ 3

Author(s):

Shengdan Wang ◽

Wenhua Gao ◽

Kefu Chen ◽

Jinsong Zeng ◽

Jun Xu ◽

...

Keyword(s):

Correlation Coefficient ◽

Congo Red ◽

Kraft Pulp ◽

Cellulose Nanofibrils ◽

Standard Curve ◽

Congo Red Dye ◽

Mechanical Disintegration ◽

Softwood Kraft Pulp ◽

White Water ◽

Red Dye

Cellulose nanofibrils (CNF) were prepared by cellulase in conjunction with mechanical disintegration from the bleached softwood kraft pulp and labelled by Congo red dye. The labelled CNF were used to investigate the retention and distribution of CNF in paper handsheets. The retention of the labelled CNF was obtained by measuring the absorbance of white water using an ultraviolet-visible spectrophotometer. The results showed that this method for measuring the retention was rapid, feasible, and sensitive, owing to the high correlation coefficient R2 (0.9993) of the standard curve. The labelled CNF showed even distribution in paper handsheets. The colorimetric values of paper handsheets were explored with a residual ink analyzer.

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