Applications of Fe3O4@AC nanoparticles for dye removal from simulated wastewater

Five novel coagulants, DC-491, Fennofix K97, BWD-01, MD-03 and MD-04 were chosen to treat reactive brilliant red X-3B simulated wastewater by jar tests. The results showed that the decolorization efficiencies were all higher than 75% at initial pH 8.2 and temperature 20 after 20 minutes of reaction. Then, two typical coagulants, BWD-01 and MD-04 which had better performance were chosen to study the effect of dye removal of X-3B at different operating parameters, including coagulant dosage, pH, sedimentaion time and reaction temperature of simulated wastewater. Decolorization efficiency of MD-04 for X-3B solution was higher than 80% in pH range from 3 to 9, while for BWD-01, efficiency increased from 37.3% to 82.3% in this pH range. For both BWD-01 and MD-04, the color removal efficiency increased as the solution temperature increased and the maximum efficiency was over 94% at 40. Small changes in the color removal efficiency were observed after 1 hour sedimentation for both coagulants.

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

Molecules ◽

10.3390/molecules23082005 ◽

2018 ◽

Vol 23 (8) ◽

pp. 2005 ◽

Cited By ~ 6

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.

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

10.20944/preprints201807.0630.v1 ◽

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.

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Removal of residual carcinogenic dyes from industrial wastewater using flocculation technique

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq160429024z ◽

2018 ◽

Vol 24 (1) ◽

pp. 69-76 ◽

Cited By ~ 2

Author(s):

M.S. Zafar ◽

S.W. Ahmad ◽

M. Zia-Ul-Haq ◽

A. Mubeen ◽

W.A. Khan

Keyword(s):

Dye Removal ◽

Parametric Design ◽

Potato Starch ◽

Jar Test ◽

Dye Reduction ◽

Simulated Wastewater ◽

Dye Industry ◽

Orthogonal Tests ◽

Flocculation Process ◽

Flocculation Time

Due to inefficient dyeing procedures in a typical dye industry, a large quantity of dye spills out into the wastewater, polluting it and causing serious harm to the environment. Consequently, special attention was focused on the use of a novel combination of a coagulant and a flocculant. As potato starch has already proved its strength as a bioflocculant, a combination of potato starch with iron(III) chloride as a coagulant was tested in order to achieve favorable results of dye reduction in simulated wastewater. The effect of various parameters on dye removal was investigated, like dosage of flocculant, temperature of treatment and flocculation time. Batch experimentation mode was adopted for the flocculation process, using a jar test apparatus. A mixed level parametric design (L16) was employed for experimentation. The orthogonal tests revealed that the best operating parameters were: 2% of potato starch, 60?C and 20 min of flocculation time. Furthermore, the significant factor test was performed using Minitab-17 from where the dosage of potato starch was proven to be the most significant factor. The study successfully raised dye removal efficiency up to 85% using a novel coagulant-flocculant combination. Finally, the results were compared with existing literature.

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Kinetics and Thermodynamic Studies for Rhodamine B Dye Removal onto Graphene Oxide Nanosheets in Simulated Wastewater

American Journal of Applied Chemistry ◽

10.11648/j.ajac.20190701.12 ◽

2019 ◽

Vol 7 (1) ◽

pp. 10 ◽

Cited By ~ 1

Author(s):

Owolabi Mutolib Bankole

Keyword(s):

Graphene Oxide ◽

Rhodamine B ◽

Dye Removal ◽

Graphene Oxide Nanosheets ◽

Thermodynamic Studies ◽

Simulated Wastewater ◽

Rhodamine B Dye ◽

Kinetics And Thermodynamic

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Binary Dye Removal from Simulated Wastewater Using Reduced Graphene Oxide Loaded with Fe-Cu Bimetallic Nanocomposites Combined with an Artificial Neural Network

Materials ◽

10.3390/ma14185268 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5268

Author(s):

Ling Xin ◽

Xianliang Wu ◽

Yiqiu Xiang ◽

Shengsheng Zhang ◽

Xianfei Huang ◽

...

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Particle Swarm Optimization ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Dye Removal ◽

Swarm Optimization ◽

Reduced Graphene ◽

Simulated Wastewater ◽

Artificial Neural

Reduced graphene oxide loaded with an iron-copper nanocomposite was prepared in this study, using graphene oxide as a carrier and ferrous sulfate, copper chloride and sodium borohydride as raw materials. The obtained material was prepared for eliminating hazardous dye carmine and the binary dye mixture of carmine and Congo red. The process of carmine dye removal by the nanocomposite was modeled and optimized through response surface methodology and artificial intelligence (artificial neural network–particle swarm optimization and artificial neural network–genetic algorithm) based on single-factor experiments. The results demonstrated that the surface area of the nanocomposite was 41.255 m2/g, the pore size distribution was centered at 2.125 nm, and the saturation magnetization was up to 108.33 emu/g. A comparison of the material before and after the reaction showed that the material could theoretically be reused three times. The absolute error between the predicted and experimental values derived by using artificial neural network–particle swarm optimization was the smallest, indicating that this model was suitable to remove carmine from simulated wastewater. The dose factor was the key factor in the adsorption process. This process could be described with the pseudo-second-order kinetic model, and the maximum adsorption capacity was 1848.96 mg/g. The removal rate of the mixed dyes reached 96.85% under the optimal conditions (the dosage of rGO/Fe/Cu was 20 mg, the pH was equal to 4, the initial concentration of the mixed dyes was 500 mg/L, and the reaction time was 14 min), reflecting the excellent adsorption capability of the material.

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Optimization of Sono-Electrocoagulation Process for the Removal of Dye Using Central Composite Design

Mehran University Research Journal of Engineering and Technology ◽

10.22581/muet1982.1902.14 ◽

2019 ◽

Vol 38 (2) ◽

pp. 399-414

Author(s):

Abdul Rauf Shah ◽

Hajira Tahir

Keyword(s):

Central Composite Design ◽

Dye Removal ◽

Sonication Time ◽

Operational Parameters ◽

Before And After ◽

Electrocoagulation Process ◽

Simulated Wastewater ◽

Process Factors ◽

Central Composite ◽

Dye Molecule

Sono-electrocaogulation process was successfully applied for the removal of RR120 (Reactive Red 120) in the presence of activated carbon. For this purpose, the process variables were optimized using CCD (Central Composite Design). The operational parameters of the technology were the amount of activated charcoal (0.2-2.0g), amount of NaCl electrolyte (1-10g), sonication time (30-120 min) and RR120 dye concentration (40-120 mg/L), respectively. Consequently, the 100% dye removal was determined at the optimal conditions for the process obtained by CCD. In addition, the sonication time, amount of adsorbent and dye concentrations were found the significant process factors. Furthermore, the effects of other parameters like the electric current, current efficiency, amount of NaCl, temperature and formation of coagulants were also studied in the dye removal process, separately. The FTIR (Fourier Transfer Infrared) spectrums were monitored to identify the classes of functional groups present in the dye molecule before and after the treatment. Therefore, the sono-electrocaogulation process was proved an effective technique for purifying simulated wastewater containing RR120 dye.

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