scholarly journals Cationic High Molecular Weight Lignin Polymer: A Flocculant for the Removal of Anionic Azo-Dyes from Simulated Wastewater

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 2005 ◽  
Author(s):  
Shoujuan Wang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Qingxi Hou
Keyword(s):  
Molecular Weight ◽  
Azo Dyes ◽  
Textile Industry ◽  
Dye Removal ◽  
Complex Structure ◽  
Marginal Effect ◽  
Reactive Black 5 ◽  
Reactive Orange 16 ◽  
Simulated Wastewater ◽  
Reactive Orange

The presence of dyes in wastewater effluents made from the textile industry is a major environmental problem due to their complex structure and poor biodegradability. In this study, a cationic lignin polymer was synthesized via the free radical polymerization of lignin with [2-(methacryloyloxy) ethyl] trimethyl ammonium chloride (METAC) and used to remove anionic azo-dyes (reactive black 5, RB5, and reactive orange 16, RO16) from simulated wastewater. The effects of pH, salt, and concentration of dyes, as well as the charge density and molecular weight of lignin-METAC polymer on dye removal were examined. Results demonstrated that lignin-METAC was an effective flocculant for the removal of dye via charge neutralization and bridging mechanisms. The dye removal efficiency of lignin-METAC polymer was independent of pH. The dosage of the lignin polymer required for reaching the maximum removal had a linear relationship with the dye concentration. The presence of inorganic salts including NaCl, NaNO3, and Na2SO4 had a marginal effect on the dye removal. Under the optimized conditions, greater than 98% of RB5 and 94% of RO16 were removed at lignin-METAC concentrations of 120 mg/L and 105 mg/L in the dye solutions, respectively.

scholarly journals Cationic High Molecular Weight Lignin Polymer: A Flocculant for the Removal of Anionic Azo-Dyes from Simulated Wastewater

2018 ◽  
Author(s):  
Shoujuan Wang ◽  
Fangong Kong ◽  
Pedram Fatehi ◽  
Qingxi Hou
Keyword(s):  
Molecular Weight ◽  
Azo Dyes ◽  
Textile Industry ◽  
Dye Removal ◽  
Complex Structure ◽  
Marginal Effect ◽  
Reactive Black 5 ◽  
Trimethylammonium Chloride ◽  
Reactive Orange 16 ◽  
Simulated Wastewater

The presence of dyes in wastewater effluents made from the textile industry is a major environmental problem due to their complex structure and poor biodegradability. In this study, a cationic lignin polymer was synthesized via the free radical polymerization of lignin with [2- (methacryloyloxy) ethyl] trimethylammonium chloride (METAC) and used to remove anionic azo-dyes (reactive black 5, RB5, and reactive orange 16, RO16) from simulated wastewater. The effects of pH, salt and concentration of dyes, well as the charge density and molecular weight of lignin-METAC polymer on dye removal were examined. Results demonstrated that lignin-METAC was an effective flocculant for the removal of dye via charge neutralization and bridging mechanisms. The dye removal efficiency of lignin-METAC polymer was independent of pH. The dosage of the lignin polymer required for reaching the maximum removal had a linear relationship with the dye concentration. The presence of inorganic salts including NaCl, NaNO3 and Na2SO4 had marginal effect on the dye removal. Under the optimized conditions, greater than 98 % of RB5 and 94 % of RO16 were removed at lignin-METAC concentrations of 120 mg/L and 105 mg/L in the dye solutions, respectively.

Development of a PANI/Fe(NO3)2 nanomaterial for reactive orange 16 (RO16) dye removal

2021 ◽  
Author(s):  
Tanvir Arfin ◽  
Dipti A. Bhaisare ◽  
S. S. Waghmare
Keyword(s):  
Dye Removal ◽  
Aniline Hydrochloride ◽  
Reactive Orange 16 ◽  
Reactive Orange

Polyaniline–iron(ii) nitrate was prepared by the polymerization of aniline hydrochloride with Fe(NO3)2.

scholarly journals Application of Cationic Surfactant Modified Mengkuang Leaves (Pandanus atrocapus) for the Removal of Reactive Orange 16 from Batik Wastewater: A Column Study

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
Megat Ahmad Kamal Megat Hanafiah ◽  
Shariff Ibrahim ◽  
Nur Izah Fasihah Mohamad Subberi ◽  
Nesamalar Kantasamy ◽  
Is Fatimah
Keyword(s):  
Cationic Surfactant ◽  
Flow Rate ◽  
Dye Removal ◽  
Fixed Bed ◽  
Morphological Characteristics ◽  
Breakthrough Time ◽  
Anionic Dye ◽  
Reactive Orange 16 ◽  
Bed Height ◽  
Reactive Orange

The feasibility of Mengkuang leaves (Pandanus atrocarpus) as a non-conventional low-cost adsorbent for the removal of an anionic dye, Reactive Orange 16 (RO16), was investigated. Among the dyes that have been commonly used in the Batik industry was reactive dye. In this study, Mengkuang leaves were chemically modified with cetyltrimethylammonium bromide (CTAB), a cationic surfactant, to improve their adsorption performance toward anionic dyes. The adsorbent’s morphological characteristics were analyzed using a scanning electron microscope (SEM). The surface of modified Mengkuang leaves seems to be irregular and uneven, with more porous structures than raw Mengkuang leaves. Adsorption of RO16 dye in fixed bed column using modified Mengkuang leaves adsorbent indicated the breakthrough time increased at higher bed height and lower flow rate. The breakthrough times for bed height of 0.5, 2, and 4 cm were at 16, 68, and 165 min, respectively. Meanwhile, breakthrough time for the flow rate of 2,5 and 7 mL.min-1 were at 327, 104, and 43 min, respectively. However, the study utilizing raw Mengkuang leaves showed no significant removal of RO16. Thus, it can be concluded that the cationic surfactant modification of Mengkuang leaves is advantageous for anionic dye removal. This anionic dye removal is significantly influenced by column parameters such as bed height and flow rate as the plotted breakthrough curves obtained from experimental data were similar to the typical breakthrough curve. When applied to the Yoon-Nelson model, the adsorption data provided the best fit with the R2 value above 0.95. The time taken for the breakthrough is very similar to model prediction values. Experiments with real batik dye wastewater showed the immense potential of modified Mengkuang leaves where total removal of real Batik wastewater was instantaneous.

scholarly journals Discoloration of Reactive black 5 by individual and consortium of Rhodotorula mucilaginosa, Galactomyces pseudocandidum and Escherichia coli free and immobilized

2018 ◽  
Vol 38 (3) ◽  
pp. 8-14 ◽  
Author(s):  
María Alejandra Flórez-Restrepo ◽  
Madeleiner García Jiménez ◽  
Diego Fernando López Lugo ◽  
Luisa María Múnera Porras ◽  
Nancy Johanna Pino Rodríguez ◽  
...  
Keyword(s):  
Waste Water ◽  
Escherichia Coli ◽  
Azo Dyes ◽  
Sugar Cane ◽  
Textile Industry ◽  
Calcium Alginate ◽  
Reactive Black 5 ◽  
Rhodotorula Mucilaginosa ◽  
Immobilization Matrix

The textile industry is a generator of high volumes of waste water with a high content of pollutants such as azo dyes, which are recalcitrant and persistent in the environment, these ones have been of interest in the last decades for the entities in charge of the care of the environment. This study evaluated the ability to discolor of reactive black 5 (NR5) by a consortium and the microorganisms that constitute Rhodotorula mucilaginosa, Galactomyces pseudocandidum and Escherichia coli free and immobilized in calcium alginate, coffee husks and bagasse of sugar cane. The results show discoloration was evidenced, where the highest percentage corresponds to G. pseudocandidum (90,05%) and the lowest to R. mucilaginosa (79,31%). When comparing the percentages of discoloration between the free microorganisms and the immobilization matrices, it is observed that the former exhibit the highest percentages of discoloration. In addition, there are no significant differences between using cane bagasse or coffee husks as immobilization matrix.

scholarly journals Catalytic Activity of Porous Phosphate Heterostructures-Fe towards Reactive Black 5 Degradation

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Marco S. Lucas ◽  
Manuel Algarra ◽  
José Jiménez-Jiménez ◽  
Enrique Rodríguez-Castellón ◽  
José A. Peres
Keyword(s):  
Catalytic Activity ◽  
Economic System ◽  
Azo Dyes ◽  
Azo Dye ◽  
Reactive Black 5 ◽  
Heterogeneous Process ◽  
Fenton’S Reaction ◽  
Mild Conditions ◽  
Simulated Wastewater ◽  
Porous Phosphate

Fenton’s reaction is often used to decompose stable substances in wastewater. In this study, experiments based on the effect of porous phosphate heterostructures as catalyst sorbent of Fe2+synthesised by different procedures were planned. The examined PPH-Fe/H2O2as oxidant in a heterogeneous process under mild conditions at pH 5 was found to be very efficient for discoloration of a simulated wastewater containing 50 mg L−1of a commercial azo dye (Reactive Black 5) reaching 95% of decolourization. Under the described conditions total visual decolourization was achieved after 360 min. This study can provide a simple, effective, and economic system ideal for the treatment of toxic and nonbiodegradable azo dyes.

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