scholarly journals Effect of Diffusion on Discoloration of Congo Red by Alginate Entrapped Turnip (Brassica rapa) Peroxidase

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Afaf Ahmedi ◽  
Mahmoud Abouseoud ◽  
Amrane Abdeltif ◽  
Couvert Annabelle
Keyword(s):  
Brassica Rapa ◽  
Congo Red ◽  
Dye Degradation ◽  
Effective Diffusion ◽  
Batch Process ◽  
Alginate Beads ◽  
Spherical Particles ◽  
Diffusion Resistance ◽  
Thiele Modulus ◽  
Enzymatic Discoloration

Enzymatic discoloration of the diazo dye, Congo red (CR), by immobilized plant peroxidase from turnip “Brassica rapa” is investigated. Partially purified turnip peroxidase (TP) was immobilized by entrapment in spherical particles of calcium alginate and was assayed for the discoloration of aqueous CR solution. Experimental data revealed that pH, reaction time, temperature, colorant, and H2O2 concentration play a significant role in dye degradation. Maximum CR removal was found at pH 2.0, constant temperature of 40°C in the presence of 10 mM H2O2, and 180 mg/L of CR. More than 94% of CR was removed by alginate immobilized TP after 1 h of incubation in a batch process under optimal conditions. About 74% removal efficiency was retained after four recycles. Diffusional limitations in alginate beads such as effectiveness factor η, Thiele modulus Φ, and effective diffusion coefficients (De) of Congo red were predicted assuming a first-order biodegradation kinetic. Results showed that intraparticle diffusion resistance has a significant effect on the CR biodegradation rate.

scholarly journals A Comparative Study on Dye Degradation by Leaf and Root Extracts of Parthenium hysterophorus L

2018 ◽  
Vol 6 (4) ◽  
pp. 327-331
Author(s):  
Dipesh Shahi ◽  
Rajiv Sapkota
Keyword(s):  
Malachite Green ◽  
Seedling Growth ◽  
Congo Red ◽  
Dye Degradation ◽  
Cost Effective ◽  
Germination Percentage ◽  
Parthenium Hysterophorus ◽  
Treated Wastewater ◽  
Root Extracts ◽  
Phytotoxicity Test

The use of different dyes and pigments is increasing with the increase in industrialization leading to the high production of effluent. The effluent contaminated with dyes and dye-stuff has harmful effects on public health and the environment. Thus, the treatment of effluent is essential. Biological approaches are gaining much interest due to their cost-effective and eco-friendly nature over various physicochemical methods for the treatment of dye-contaminated wastewater. This study highlights on the biodegradation of congo red and malachite green by using leaf and root extracts of Parthenium hysterophorus. The extract and the dye were mixed in the ratio of 1:2 and incubated at 40ºC for 90 minutes. Decolorization assay was performed using UV visible spectrophotometer which indicated that decolorization was due to degradation of dyes into non-colored metabolites. The leaves extract exhibited higher decolorizing activity than roots extract. The maximum decolorization for leaves extract was 55.8% (congo red) and 51.6% (malachite green). Furthermore, phytotoxicity test was carried out to determine the effect of dyes and their degradation metabolites on seed germination and seedling growth of chickpea (Cicer arietinum L). The germination percentage and seedling growth were more in degradation metabolites than untreated dyes, indicating less toxic nature of degradation metabolites. Hence, it can be inferred that P. hysterophorus extracts can be used to treat dye wastewater and treated wastewater can be used for irrigation. Int. J. Appl. Sci. Biotechnol. Vol 6(4): 327-331

scholarly journals Congo Red Decolorization and Detoxification by Aspergillus niger: Removal Mechanisms and Dye Degradation Pathway

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Nedra Asses ◽  
Lamia Ayed ◽  
Neila Hkiri ◽  
Moktar Hamdi
Keyword(s):  
Molecular Structure ◽  
Aspergillus Niger ◽  
Azo Dyes ◽  
Lignin Peroxidase ◽  
Congo Red ◽  
Manganese Peroxidase ◽  
Dye Degradation ◽  
Degradation Pathway ◽  
Effects Of Ph ◽  
Maximum Decolorization

Congo red is one of the best known and used azo dyes which has two azo bonds (-N=N-) chromophore in its molecular structure. Its structural stability makes it highly toxic and resistant to biodegradation. The objective of this study was to assess the congo red biodegradation and detoxification by Aspergillus niger. The effects of pH, initial dye concentration, temperature, and shaking speed on the decolorization rate and enzymes production were studied. The maximum decolorization was correlated with lignin peroxidase and manganese peroxidase production. Above 97% were obtained when 2 g mycelia were incubated at pH 5, in presence of 200 mg/L of dye during 6 days at 28°C and under 120 to 150 rpm shaking speed. The degraded metabolites were characterized by using LC-MS/MS analyses and the biodegradation mechanism was also studied. Congo red bioconversion formed degradation metabolites mainly by peroxidases activities, i.e., the sodium naphthalene sulfonate (m/z = 227) and the cycloheptadienylium (m/z = 91). Phytotoxicity and microtoxicity tests confirmed that degradation metabolites were less toxic than original dye.

scholarly journals Congo Red and Nigrosine Dye Degradation using Dimethyl Dioxirane as an Oxidising Agent

2021 ◽  
Vol 37 (5) ◽  
pp. 1221-1228
Author(s):  
S. Vinotha ◽  
A.Leema Rose
Keyword(s):  
Congo Red ◽  
Room Temperature ◽  
Functional Group ◽  
Dye Degradation ◽  
Visible Spectroscopy ◽  
Before And After ◽  
Ft Ir ◽  
Combined Action ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

The advanced oxidation of Congo red (CR) and Nigrosine (NI) using the combined action of dimethyl dioxirane as an oxidising agent is described in this study. The effects of several parameters, such as the concentration of the oxidising agent, the initial dye concentration, and the pH, have been investigated. At room temperature, the oxidising agent dimethyl dioxirane was employed to test the degradation of CR and NI dyes. On the degradation efficiency of CR and NI, pH’s effects, oxidising agent, and initial dye concentration were examined. The absorbance of CR and NI dyes before and after degradation was measured using UV-visible spectroscopy. The functional group existing in the dyes before and after degradation was determined using FT-IR spectroscopy.

scholarly journals Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1560 ◽  
Author(s):  
Zhili Peng ◽  
Yiqun Zhou ◽  
Chunyu Ji ◽  
Joel Pardo ◽  
Keenan J. Mintz ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Carbon Dots ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Average Diameter ◽  
Spherical Particles ◽  
Promising Alternative ◽  
Excellent Photocatalytic Activity ◽  
Doped Carbon Dots

Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

Photocatalytic Performance Evaluation of Bismuth Doped Tin-Dioxide under UV and Direct Sunlight Irradiation for Congo Red Dye Degradation

2020 ◽  
Vol 42 (5) ◽  
pp. 687-687
Author(s):  
Nauman Ali Nauman Ali ◽  
Adnan khan Adnan khan ◽  
Aaisha Riaz Aaisha Riaz ◽  
Abdullah M Asiri and Tahseen Kamal Abdullah M Asiri and Tahseen Kamal
Keyword(s):  
Photocatalytic Degradation ◽  
Congo Red ◽  
Tin Dioxide ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Sno2 Nanoparticles ◽  
Research Work ◽  
Precipitation Method ◽  
Congo Red Dye ◽  
Red Dye

In the current research work, bismuth doped tin-dioxide (Bi-SnO2) was prepared by wet chemical co-precipitation method. The synthesized material was used as a photocatalyst in the degradation of congo red dye (CR) in its aqueous solution. The prepared catalyst was used in the uncalcined- and calcined forms for the photocatalytic reaction. The synthesized catalyst in both forms was characterized by UV-visible spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The XRD revealed that the calcination of the Bi-SnO2 improved its crystallinity. The SEM showed that the Bi-SnO2 had average size less than 150nm. Photocatalytic degradation of CR dye was carried out under ultra-violet light as well as under sunlight. While testing the photocatalytic degradation performance, it was found that more than 80% of the CR was degraded by using Bi-SnO2 nanoparticles under both lighting conditions. Moreover, the calcined Bi-SnO2 nanoparticles showed better photocatalytic performance as compared to its uncalcined form. The present work provides a viable way to make efficient photocatalyst based-on Bi-SnO2 to employ under UV and sunlight for the degradation of the CR dye without the need of oxidizing or reducing agents.

Removal of Toxic Congo Red Dye Using Water Hyacinth Petiole, an Efficient and Selective Adsorbent

2019 ◽  
Vol 41 (5) ◽  
pp. 825-825
Author(s):  
Abul Kalam Md Lutfor Rahman Abul Kalam Md Lutfor Rahman ◽  
Rajib Al Mamun Rajib Al Mamun ◽  
Nafees Ahmed Nafees Ahmed ◽  
Aparna Sarkar and Akash Mamon Sarkar Aparna Sarkar and Akash Mamon Sarkar
Keyword(s):  
Congo Red ◽  
Water Hyacinth ◽  
Freundlich Isotherm ◽  
Batch Process ◽  
Living System ◽  
Sodium Chlorite ◽  
Order Kinetic ◽  
Ph Values ◽  
Equilibrium Data ◽  
Selective Adsorbent

Congo red (CR), one of the major dyes used in the textile mills of Bangladesh has carcinogenic and chronic effect on living system. Removal of CR was done by using water hyacinth petiole (WHP), an efficient and selective adsorbent. Adsorption experiment was performed through batch process at different pH values, dye concentrations, contact times, particle sizes and dosages of adsorbent. A comparable study was carried out using untreated and sodium chlorite treated WHP at different pH values. Equilibrium adsorption was attained after 240 minutes. The highest removal 94.88% was obtained using sodium chlorite treated water hyacinth petiole (SCT-WH) and 94.51% using untreated water hyacinth petiole (UT-WH) at pH 6. Adsorption increased with the increase of initial dye concentration and after a certain time saturation was attained. Adsorption decreased with the increase of particles size (≤ 75and#181;m, ≤ 150and#181;m and ≤ 300and#181;m) and increased with the amount of adsorbent (0.25g, 0.50g and 0.75g). The equilibrium data were best described by the Freundlich isotherm and adsorption kinetics better fitted to pseudo-second-order kinetic model.

Enzymatic Degradation of Congo Red by Turnip (Brassica rapa) Peroxidase

2012 ◽  
Vol 67 ◽  
pp. 0429 ◽  
Author(s):  
Afaf Ahmedi ◽  
Mahmoud Abouseoud ◽  
Annabelle Couvert ◽  
Abdeltif Amrane
Keyword(s):  
Brassica Rapa ◽  
Congo Red ◽  
Enzymatic Degradation
Sign in / Sign up

Export Citation Format

Share Document