scholarly journals Decolourization of Congo Red Dye using Solar/H2O2 Process

2021 ◽  
Vol 33 (6) ◽  
pp. 1294-1298
Author(s):  
R. Raja ◽  
A. Rose Venis ◽  
R. Tamil Selvan ◽  
T. Mohandas
Keyword(s):  
Light Intensity ◽  
Congo Red ◽  
Advanced Oxidation Process ◽  
Kinetic Studies ◽  
Solar Light ◽  
H2o2 Concentration ◽  
Congo Red Dye ◽  
Toc Removal ◽  
Red Dye ◽  
Removal Studies

The Congo red dye was decolourized by advanced oxidation process using solar/H2O2 method and the effect of various parameters on decolourization like pH, H2O2 concentration, dye concentration, solar light intensity, additives, COD and TOC removal studies and kinetic studies were investigated. The photodegradation process was done by exposing dye solutions with the concentration of 100 mg/L treated with 50% H2O2 to sunlight with the lux intensity range of 60,000-90,000 lux. The best possible pH 2 with an optimal H2O2 concentration of 1000 mM to achieve 100% decolourization within the period of 5 h. The kinetic studies done on H2O2 concentration also proved that the high solar light intensity leads to higher decolourization and low solar light intensity leads to lesser decolourization. Addition of additives like H2PO4 – and Cl– leads to a decrease in the rate of decolourization. The removal of COD and TOC removal was found to be 83.26% and 5.18%, respectively.

Novel rare earth (RE-La, Er, Sm) metal doped ZnO photocatalysts for degradation of Congo-Red dye: Synthesis, characterization and kinetic studies

2019 ◽  
Vol 239 ◽  
pp. 225-234 ◽  
Author(s):  
Petronela Pascariu ◽  
Corneliu Cojocaru ◽  
Niculae Olaru ◽  
Petrisor Samoila ◽  
Anton Airinei ◽  
...  
Keyword(s):  
Rare Earth ◽  
Congo Red ◽  
Kinetic Studies ◽  
Congo Red Dye ◽  
Doped Zno ◽  
Metal Doped ◽  
Red Dye

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.

Thiourea assisted hydrothermal synthesis of ZnS/CdS/Ag2S nanocatalysts for photocatalytic degradation of Congo red under direct sunlight illumination

RSC Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 4227-4236 ◽  
Author(s):  
Kalyanaraman Kalpana ◽  
Vaithilingam Selvaraj
Keyword(s):  
Hydrothermal Synthesis ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Solar Light ◽  
Direct Sunlight ◽  
Congo Red Dye ◽  
Red Dye

Schematic illustration for the photodecomposition of Congo red dye using ZnS/CdS/Ag2S nanocomposites under solar light.

scholarly journals Kinetic studies of Congo red dye adsorption by immobilized Aspergillus niger on alginate

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Mohammed T. M. H. Hamad ◽  
Mona S. S. Saied
Keyword(s):  
Aspergillus Niger ◽  
Congo Red ◽  
Textile Industry ◽  
High Performance ◽  
Dye Adsorption ◽  
Kinetic Studies ◽  
Textile Dye ◽  
Congo Red Dye ◽  
Phytotoxicity Test ◽  
Red Dye

AbstractReleasing of dye-containing wastewater by the textile industry into general water bodies can adversely affect aquatic ecosystems and human health. The objective of this study is to assess the Congo red dye biodegradation and detoxification by immobilized Aspergillus niger obtained from textile dye wastewater. The effects of process parameters like pH, temperature, reaction time and initial concentration on Congo red degradation were studied. Equilibrium adsorption isotherms, kinetics and thermodynamics were also investigated. The experimental data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption. The adsorption isotherm data fitted well to Langmuir isotherm and the kinetic data fitted well to the pseudo-second-order model. The degraded metabolites of Congo red were characterized by using UV–Vis spectrophotometer, Fourier transform infrared spectroscopy and high-performance liquid chromatography, further confirmed that biodegradation of Congo red was due to reduction of the azo bond. Phytotoxicity test confirmed that degradation metabolites were a less toxic than original dye. The reusability of the immobilized Aspergillus niger was repeated with six cycles and removal efficiency ranged from 98 to 72%. The results in this study substantiate that immobilized Aspergillus niger could be employed as a good adsorbent for the removal of Congo red dye from wastewater.

CdS nanocapsules and nanospheres as efficient solar light-driven photocatalysts for degradation of Congo red dye

2016 ◽  
Vol 72 ◽  
pp. 33-41 ◽  
Author(s):  
Azam Khan ◽  
Zia-ur-Rehman ◽  
Muneeb-ur- Rehman ◽  
Rajwali Khan ◽  
Zulfiqar ◽  
...  
Keyword(s):  
Congo Red ◽  
Solar Light ◽  
Congo Red Dye ◽  
Red Dye

scholarly journals Preparation of NiFe2O4 Nanoparticles by Solution Combustion Method as Photocatalyst of Congo red

2021 ◽  
Vol 16 (3) ◽  
pp. 481-490
Author(s):  
Poedji Loekitowati Hariani ◽  
Muhammad Said ◽  
Addy Rachmat ◽  
Fahma Riyanti ◽  
Handayani Citra Pratiwi ◽  
...  
Keyword(s):  
Congo Red ◽  
Combustion Method ◽  
H2o2 Concentration ◽  
Solution Combustion ◽  
Solution Ph ◽  
Solution Combustion Method ◽  
X Ray ◽  
Congo Red Dye ◽  
Nife2o4 Nanoparticles ◽  
Red Dye

NiFe2O4 nanoparticles had been successfully synthesized by solution combustion method using urea fuel (organic precursor). The synthesized NiFe2O4 were characterized by X-ray diffraction (XRD), Scanning electron microscopy-Electron Dispersive X-ray Spectroscopy (SEM-EDs), Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red (FTIR), Vibrating Sample Magnetometer (VSM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS), and Point of Zero Charge (pHpzc). NiFe2O4 nanoparticles irradiated with visible light were employed to degrade Congo red dye with the following variable: solution pH (3–8), H2O2 concentration (0.5–3 mM), and Congo red concentration (100–600 mg/L). XRD analysis results showed that the NiFe2O4 nanoparticles had a cubic spinel structure. The particle sizes are in the range of 10–40 nm. The magnetic properties of NiFe2O4 nanoparticles determined using VSM showed a magnetization saturation value of 47.32 emu/g. UV-Vis DRS analysis indicated that NiFe2O4 nanoparticles had an optical band gap of 1.97 eV. The success of synthesis was also proven by the EDS analysis results, which showed that the synthesized NiFe2O4 nanoparticles composed of Ni, Fe, and O elements. The removal efficiency of Congo red dye was 96.80% at the following optimum conditions: solution pH of 5.0, H2O2 concentration of 2 mM, Congo red dye concentration of 100 mg/L, and contact time of 60 min. The study of the photodegradation kinetics follows a pseudo-first order reaction with a rate constant value of 0.0853 min−1. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 

Efficient Solar Light Driven Photocatalytic Degradation of Congo Red Dye on CdS Nanostructures Derived from Single Source Precursor

2018 ◽  
Vol 18 (11) ◽  
pp. 7405-7413 ◽  
Author(s):  
Jamal Abdul Nasir ◽  
Shaheen Gul ◽  
Azam Khan ◽  
Zawar Hussain Shah ◽  
Abrar Ahmad ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Congo Red ◽  
Solar Light ◽  
Single Source ◽  
Congo Red Dye ◽  
Single Source Precursor ◽  
Cds Nanostructures ◽  
Red Dye

Biosorption of congo red dye from aqueous solutions using synthesized silver nano particles of Grevillea robusta: Kinetic studies

2020 ◽  
Vol 26 ◽  
pp. 3009-3014
Author(s):  
P. VenkataRao ◽  
G. SaiTarun ◽  
Ch Govardhani ◽  
B. Manasa ◽  
P. Joel Joy ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Congo Red ◽  
Kinetic Studies ◽  
Nano Particles ◽  
Grevillea Robusta ◽  
Congo Red Dye ◽  
Red Dye

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.

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