scholarly journals Plausible Applicability of Aqueous Congo Red Dye System as Secondary Gamma-ray Dosimeter

2008 ◽  
Vol 5 (3) ◽  
pp. 572-576
Author(s):  
I. Das Sarma ◽  
D. V. Parwate
Keyword(s):  
Extinction Coefficient ◽  
Congo Red ◽  
Gamma Ray ◽  
Molar Extinction Coefficient ◽  
Aqueous Systems ◽  
Γ Irradiation ◽  
Gamma Source ◽  
Congo Red Dye ◽  
Red Dye ◽  
Dye Solutions

Aqueous congo red dye solutions in the concentration range of 0.01–0.03mM were irradiated for varying γ doses 0.050 kGy to 0.150 kGy. The molar extinction coefficient of the dye solution of congo red was found to be 2.70×105at its absorption maxima 499.0 nm. No change in λmaxwas observed on irradiation. As the dye solutions are sensitive towards γ–irradiation, decolouration occurs on irradiation. The G–values for the doses in between the range of 0.035 kGy to 0.125 kGy were found to be practically constant for pure aqueous systems. Hence this was used to determine the dose of the gamma source. With the addition of alcohols in the systems, degradation of the dyes due to radiations decreased considerably.

scholarly journals Radiation induced degradation of Congo red dye: a mechanistic study

Nukleonika ◽  
2019 ◽  
Vol 64 (2) ◽  
pp. 49-53 ◽  
Author(s):  
Majid Muneer ◽  
Muhammad Saeed ◽  
Ijaz Ahmad Bhatti ◽  
Atta-ul Haq ◽  
Muhammad Kaleem Khosa ◽  
...  
Keyword(s):  
Congo Red ◽  
Gamma Ray ◽  
Advanced Oxidation Process ◽  
Degradation Mechanism ◽  
Degradation Pathway ◽  
Mechanistic Study ◽  
Synthetic Dyes ◽  
Experimental Conditions ◽  
Congo Red Dye ◽  
Red Dye

Abstract Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The λmax of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a significant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.

Decolourisation of Methylene Blue and Congo Red dye solutions by adsorption using chitosan

2020 ◽  
Vol 198 ◽  
pp. 422-433
Author(s):  
Abdallah Rahali ◽  
Ali Riazi ◽  
Badredine Moussaoui ◽  
Ahmed Boucherdoud ◽  
Nihal Bektaş
Keyword(s):  
Methylene Blue ◽  
Congo Red ◽  
Congo Red Dye ◽  
Red Dye ◽  
Dye Solutions

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

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 157-164 ◽  
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.

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

2020 ◽  
Vol 18 (1) ◽  
pp. 287-294
Author(s):  
Harsasi Setyawati ◽  
Handoko Darmokoesoemo ◽  
Irmina Kris Murwani ◽  
Ahmadi Jaya Permana ◽  
Faidur Rochman
Keyword(s):  
Solar Cell ◽  
Congo Red ◽  
Large Scale ◽  
High Efficiency ◽  
Solar Cell Device ◽  
Dye Sensitized ◽  
Congo Red Dye ◽  
Elemental Analyses ◽  
Red Dye ◽  
Solar Cell Technology

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.

scholarly journals Spent Coffee Ground as Low-Cost Adsorbent for Congo Red Dye Removal from Aqueous Solution

2021 ◽  
Vol 765 (1) ◽  
pp. 012089
Author(s):  
R Taufik ◽  
M Mohamad ◽  
R Wannahari ◽  
N F Shoparwe ◽  
WHW Osman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Dye Removal ◽  
Low Cost ◽  
Congo Red Dye ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Red Dye

Sodium alginate and polypyrrole composites with algal dead biomass for the adsorption of Congo Red dye: Kinetics, thermodynamics and desorption studies

2021 ◽  
pp. 101183
Author(s):  
Munazza Maqbool ◽  
Sana Sadaf ◽  
Haq N. Bhatti ◽  
Sehrish Rehmat ◽  
Abida Kausar ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Congo Red ◽  
Dead Biomass ◽  
Congo Red Dye ◽  
Red Dye

Degradation of Congo red dye using ternary metal selenide-chitosan microspheres as robust and reusable catalysts

2021 ◽  
Vol 22 ◽  
pp. 101402 ◽  
Author(s):  
Saraf Khan ◽  
Adnan Khan ◽  
Nisar Ali ◽  
Shehzad Ahmad ◽  
Waqar Ahmad ◽  
...  
Keyword(s):  
Congo Red ◽  
Chitosan Microspheres ◽  
Congo Red Dye ◽  
Ternary Metal ◽  
Red Dye
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