scholarly journals Evaluation of Cocoa Beans Shell Powder as a Bioadsorbent of Congo Red Dye Aqueous Solutions

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2763
Author(s):  
Gabriela Rodríguez-Arellano ◽  
Juan Barajas-Fernández ◽  
Ricardo García-Alamilla ◽  
Laura Mercedes Lagunes-Gálvez ◽  
Antonio Hilario Lara-Rivera ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Congo Red ◽  
Industrial Wastes ◽  
Cocoa Bean ◽  
Synthetic Dyes ◽  
Cocoa Beans ◽  
Congo Red Dye ◽  
Order Polynomial ◽  
Red Dye ◽  
Shell Powder

The use of synthetic dyes in the textile, leather, and paper industries is a source of groundwater pollution around the world. There are different methods for the treatment of wastewater that has been contaminated with dyes, among which adsorption with agro-industrial wastes is gaining relevance. In the present study, the adsorption capacity of cocoa bean shell powder was evaluated when it was used as a bioadsorbent for Congo red dye in an aqueous medium. A 24 central factorial design with central and axial points was proposed to determine the adsorption capacity. The factors that were studied were the adsorbent (0.06–0.15 g), Congo red (40–120 mg L−1), pH (3–11), and time (4–36 h). The bioadsorbent was characterized through scanning electron microscopy and Fourier-transform infrared spectroscopy. The effects of the factors on the adsorption capacity for Congo red using cocoa bean shell were nonlinear, and they were modeled with a second-order polynomial (p < 0.05) and with an R2 of 0.84. The bioadsorbent obtained a maximum adsorption of 89.96% in runs. The process of optimization by using the surface response allowed the maximization of the adsorption, and the validation showed that 95.79% adsorption of the dye was obtained.

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.

scholarly journals Adsorption of Congo red dye onto antimicrobial terephthaloyl thiourea cross-linked chitosan hydrogels

2017 ◽  
Vol 76 (10) ◽  
pp. 2719-2732 ◽  
Author(s):  
Nouf F. El-Harby ◽  
Shaimaa M. A. Ibrahim ◽  
Nadia A. Mohamed
Keyword(s):  
Adsorption Capacity ◽  
Congo Red ◽  
Dye Adsorption ◽  
Solution Temperature ◽  
Structural Variations ◽  
Maximum Sorption Capacity ◽  
Congo Red Dye ◽  
Chitosan Hydrogels ◽  
Red Dye ◽  
Kinetics And Isotherms

Abstract Adsorption capacity of three antimicrobial terephthaloyl thiourea cross-linked chitosan hydrogels for Congo red dye removal from its aqueous solution has been investigated for the first time in this work. These hydrogels were prepared by reacting chitosan with various amounts of terephthaloyl diisothiocyanate cross-linker. The effect of the hydrogel structural variations and several dye adsorption processing parameters to achieve the best adsorption capacity were investigated. The hydrogels' structural variations were obtained by varying their terephthaloyl thiourea moieties content. The processing variables included initial concentration of the dye solution, temperature and time of exposure to the dye. The adsorption kinetics and isotherms showed that the sorption processes were better fitted by the pseudo-second-order equation and the Langmuir equation, respectively. On the basis of the Langmuir analysis Congo red dye gave the maximum sorption capacity of 44.248 mg/g. The results obtained confirmed that the sorption phenomena are most likely to be controlled by chemisorption process. The adsorption reaction was endothermic and spontaneous according to the calculated results of adsorption thermodynamics.

scholarly journals A Study of Compost as an Adsorbent for Congo Red Dye Removal Process

REAKTOR ◽  
2018 ◽  
Vol 17 (4) ◽  
pp. 203
Author(s):  
Gabriel Andari Kristanto ◽  
Ariessyawtra Raindra Lamurvie ◽  
William Koven
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Congo Red ◽  
Textile Industry ◽  
Column Height ◽  
Congo Red Dye ◽  
Treatment Processes ◽  
Percentage Removal ◽  
Red Dye ◽  
Dye Molecule

The human population continues to grow annually, and so does the number of textile industries. In textile industry, synthetic dye is one of the most polluting substance in its wastewate which the conventional treatment processes are usually ineffective. Another option is using activated carbon to remove the dye, but carbon is an expensive material. It is is interesting that  material that is rich in carbon, such as compost, may become an alternative solution. The objective of the present study was to assess the capability of compost in treating wastewater dye by determining the optimum compost dosage, particle size, and column height, while considering dye percentage removal and adsoprtion capacity. The optimum compost dosage was 8g/L and the optimum particle size was 1–2 mm in treating the 200 ppm Congo Red dye molecule, resulting in 20.49% removal and a 5.33 mg/g adsorption capacity. The optimum compost column height was 60 cm with 90% removal, and the adsorption capacity was 0.38 mg/g. The dye molecule wore off tthe compost, therefore fresh compost must be introduced in order to maintain its percentage removal level. The compatibility of isotherm model developed in this study with the Freundlich model is similar with previous studies.    Keywords: compost; congo red dye;adsorbent, batch, column 

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.

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