Investigating electrode arrangement and anode role on dye removal efficiency of electro-peroxone as an environmental friendly technology

Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.

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Removal of Methylene Blue and Congo Red Using Adsorptive Membrane Impregnated with Dried Ulva fasciata and Sargassum dentifolium

Plants ◽

10.3390/plants10020384 ◽

2021 ◽

Vol 10 (2) ◽

pp. 384

Author(s):

Ahmed Labena ◽

Ahmed E. Abdelhamid ◽

Abeer S. Amin ◽

Shimaa Husien ◽

Liqaa Hamid ◽

...

Keyword(s):

Methylene Blue ◽

Removal Efficiency ◽

Congo Red ◽

Dye Removal ◽

Industrial Effluents ◽

Composite Membranes ◽

Acrylic Fiber ◽

Ulva Fasciata ◽

Ft Ir ◽

Sorption Time

Biosorption is a bioremediation approach for the removal of harmful dyes from industrial effluents using biological materials. This study investigated Methylene blue (M. blue) and Congo red (C. red) biosorption from model aqueous solutions by two marine macro-algae, Ulva fasciata and Sargassum dentifolium, incorporated within acrylic fiber waste to form composite membranes, Acrylic fiber-U. fasciata (AF-U) and Acrylic fiber-S. dentifolium (AF-S), respectively. The adsorption process was designed to more easily achieve the 3R process, i.e., removal, recovery, and reuse. The process of optimization was implemented through one factor at a time (OFAT) experiments, followed by a factorial design experiment to achieve the highest dye removal efficiency. Furthermore, isotherm and kinetics studies were undertaken to determine the reaction nature. FT-IR and SEM analyses were performed to investigate the properties of the membrane. The AF-U membrane showed a significant dye removal efficiency, of 88.9% for 100 ppm M. blue conc. and 79.6% for 50 ppm C. red conc. after 240 min sorption time. AF-S recorded a sorption capacity of 82.1% for 100 ppm M. blue conc. after 30 min sorption time and 85% for 100 ppm C. red conc. after 240 min contact time. The membranes were successfully applied in the 3Rs process, in which it was found that the membranes could be used for five cycles of the removal process with stable efficiency.

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Acid Blue 25 Removal by using Electro-Persulfate Process

10.31224/osf.io/n25su ◽

2020 ◽

Author(s):

Zeinab Ghorbani

Keyword(s):

Aqueous Solution ◽

Removal Efficiency ◽

Salt Concentration ◽

Dye Removal ◽

Industrial Effluents ◽

Sodium Persulfate ◽

Initial Concentration ◽

Acid Blue 25 ◽

Sulfate Process ◽

Acid Blue

This study aimed to investigate the efficiency of the electro-persulfate process in removing acid blue 25 from aqueous solution. In order to optimize the parameters, the OFAT method was used, and the effect of three main parameters, including pH, sodium persulfate salt concentration, and current intensity was investigated. According to the results, the optimal removal efficiency of 94% in 60 minutes was obtained under conditions of pH=5, the initial concentration of sodium persulfate=250 mg / L, and the current=500 mA. According to the results of this study, the electro-persulfate process sulfate process can be an efficient process for dye removal from industrial effluents.

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Effect of Praestol as a Coagulant-Aid to Improve Coagulation-Flocculation in Dye containing Wastewaters

Global NEST Journal ◽

10.30955/gnj.001738 ◽

2015 ◽

Vol 18 (1) ◽

pp. 38-46 ◽

Cited By ~ 2

Keyword(s):

Ionic Strength ◽

Aqueous Solutions ◽

Removal Efficiency ◽

Dye Removal ◽

Settling Time ◽

Solution Ph ◽

Polyaluminum Chloride ◽

Flocculation Process ◽

Flocculation Time

<div> This study was conducted to investigate the effect of praestol, as a coagulant-aid, to improve coagulation-flocculation process in the removal of disperse red 60 from aqueous solutions. The effect of various parameters including coagulants dose (10-1000 mg l-1), praestol dose (0-1000 mg l-1), solution pH (3-11), initial dye concentration (100-500 mg l-1), flocculation speed (30-60 rpm), flocculation time (15-30 min), settling time (5-60 min) and ionic strength (0-6 mg l-1) was evaluated on the dye removal. The dye removal efficiency was substantially increased by using praestol in the concentration of 80 mg l-1 and 400 mg l-1 for coagulation with alum and polyaluminum chloride (PACl), respectively. The maximum dye removal by alum coupled with praestol (Al-P) and PACl coupled with praestol (PA-P) was found to be 97.8% and 98.7%, respectively that were occurred at pH 7. The results showed that the application of PA-P or Al-P can be effectively used to remove disperse red 60 (DR 60) in aqueous solutions. </div>

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Investigation of 137Cs and plutonium isotope sorption–desorption in bio- and synthetic materials

Lithuanian Journal of Physics ◽

10.3952/physics.v56i2.3307 ◽

2016 ◽

Vol 56 (2) ◽

Cited By ~ 1

Author(s):

Benedikta Lukšienė ◽

Zita Žukauskaitė ◽

Nikolaj Tarasiuk ◽

Evaldas Maceika ◽

Vitold Filistovič ◽

...

Keyword(s):

Removal Efficiency ◽

Lake Water ◽

Water Solution ◽

Plutonium Isotope ◽

Dynamic Flow ◽

Batch Type ◽

Environmental Friendly ◽

Synthetic Materials ◽

Physico Chemical

Investigations on the pre-concentration of radionuclides (137Cs and plutonium isotopes) from fresh water on solid matrices are presented in this study. A particular focus was given to an innovative physico-chemical removal process such as adsorption of radionuclides from an aqueous medium on new type adsorbents, environmental-friendly materials. Sorption of the tested radionuclides from the lake water solution by environmental assays and synthetic sorbents was compared. Lake water was analyzed for main anions, micro- and macroelements, using ion and atomic absorption chromatography methods, respectively. Batch type and dynamic flow column laboratory experiments were performed. The sorption–desorption capacity of radionuclides by the tested sorbents was estimated based on the results of α- and γ-spectrometric measurements. According to the removal efficiency results, moss can be considered as the best sorbent for plutonium of the tested environmental-friendly sorbents, whereas the moss sorption capacity exceeded even that of the tested synthetic ones. The highest 137Cs removal efficiency from the lake water solution was obtained for granular activated carbon. Application of the dynamic flow method carried out in situ confirmed the reversibility of sorbed background 137Cs activity in the moss observed during the batch type experiments, and the method of the moss bed column turned to be unfit for the pre-concentration of 137Cs from the lake water. Application of a single moss bed column for the 137Cs and plutonium isotope pre-concentration for the first time carried out in situ allowed us to determine the activity concentration of 239,240Pu and 238Pu in the lake water – 4.87±0.98 and 0.67±0.21 mBq/m3, respectively. The reversible 137Cs and different plutonium sorption in the moss apparently indicates different binding properties of these radionuclides to the moss, therefore further investigations on this issue are foreseen.

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Development of LaMnO3 and LaNiO3 type materials with calcium doping by the modified proteic method and evaluation for the dye removal efficiency

Cerâmica ◽

10.1590/0366-69132021673843146 ◽

2021 ◽

Vol 67 (384) ◽

pp. 406-413

Author(s):

A. A. Souza ◽

J. B. R. Fernandes ◽

J. F. S. Ribeiro ◽

M. J. B. Souza ◽

A. M. Garrido Pedrosa

Keyword(s):

Removal Efficiency ◽

Dye Removal ◽

Calcium Doping

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Studies on desorption and regeneration of natural pumice for iron removal from aqueous solution

Water Science & Technology ◽

10.2166/wst.2018.177 ◽

2018 ◽

Vol 2017 (2) ◽

pp. 509-515 ◽

Cited By ~ 3

Author(s):

S. Indah ◽

D. Helard ◽

A. Binuwara

Keyword(s):

Aqueous Solution ◽

Removal Efficiency ◽

Contact Time ◽

Adsorption Process ◽

Iron Removal ◽

Iron Ions ◽

The Third ◽

Environmental Friendly ◽

West Sumatra ◽

Adsorption Desorption

Abstract To make the adsorption process more economic and environmental friendly, it is necessary to study desorption and reutilization of the adsorbents. In the present study, the effectiveness of natural pumice in removal of iron from aqueous solution was investigated in several sorption-desorption cycles. The desorption characteristics of previously adsorbed iron ions on natural pumice were tested by various desorbing agents such as HCl, NaOH and aquadest. Among them, HCl showed the highest desorption efficiency (37.89%) with 0.1 M of concentration and 60 min of contact time. The removal efficiency of iron ions in reused natural pumice could be maintained up to 90% in the third cycle of adsorption. The results indicate that although complete desorption was not achieved, natural pumice from Sungai Pasak, West Sumatra, Indonesia, can be sufficiently reused up to three cycles of adsorption-desorption.

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Degradation of a Leather-Dye by the Combination of Depolymerised Wood-Chip Biochar Adsorption and Solid-State Fermentation with Trametes Villosa SCS-10

10.21203/rs.3.rs-85912/v1 ◽

2020 ◽

Author(s):

Santiago Ortiz Monsalve ◽

Mariliz Gutterres ◽

Patrícia Valente ◽

Jersson Plácido ◽

Sandra Bustamante-López ◽

...

Keyword(s):

Solid State ◽

Removal Efficiency ◽

Dye Removal ◽

Combined Treatment ◽

Wood Chip ◽

Untreated Wood ◽

Initial Assessment ◽

Solid Matrix ◽

Malt Extract ◽

Leather Industry

Abstract Adsorption into biochar-derived materials and mycoremediation are promising technologies for removing dyes from solid and liquid matrices. This study presents a combined treatment with adsorption into wood-chip biochar and mycodegradation under solid-state ermentation by Trametes villosa for removing the leather-dye Acid Blue 161. In the first stage, untreated wood-chip biochar, NaOH-depolymerised-biochar and KMnO 4 -depolymerised-biochar were assessed for their dye removal efficiency by adsorption. KMnO 4 -depolymerised-biochar exhibited the highest adsorption (85.1 ± 1.9%) after 24 h of contact. KMnO 4 -depolymerisation modified some physical and chemical properties on the untreated wood-chip biochar, increasing the surface area (50.4 m 2 g –1 ), pore size (1.9 nm), and resence of surface functional groups. Response Surface Methodology coupled with a Box-Behnken design was used to optimise the AB 161 adsorption into the KMnO 4 -depolymerised-biochar. The optimised conditions, pH 3.0, dye concentration 100 mg L –1 and sorbent dosage 2 g L –1 , led to a higher dye removal efficiency by adsorption (91.9 ± 1.0%). In a second stage, the wood-chip biochar supplemented with nutrients (1% malt extract and 0.5% peptone) was employed as a solid matrix for growing T. villosa and regenerating the dye-saturated material. After 15 days, T. villosa was able to grow (86.8 ± 0.8%), produce Laccase activity (621.9 ± 62.3 U L –1 ), and biodegrade (91.4 ± 1.3%) the dye adsorbed into the KMnO 4 -depolymerised-biochar. Finally, the mycoregenerated was reutilised in a new cycle of adsorption reaching 79.5 ± 2.0% of dye removal efficiency by adsorption. This study revealed the potential of the combined treatment and is an initial assessment for developing commercial alternatives for treating leather industry wastewaters.

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Study of C.I. Acid Orange 7 removal in contaminated water by photo oxidation processes

Global NEST Journal ◽

10.30955/gnj.000435 ◽

2013 ◽

Vol 10 (1) ◽

pp. 16-23 ◽

Cited By ~ 1

Keyword(s):

Removal Efficiency ◽

Uv Irradiation ◽

Rate Constant ◽

Dye Removal ◽

Irradiation Time ◽

Inhibitory Effect ◽

Textile Dye ◽

Acid Orange 7 ◽

Acid Orange ◽

First Order

C.I. Acid Orange 7 (AO7) commonly used as a textile dye and could be degraded by UV/ZnO, UV/H2O2 and UV/H2O2/Fe (III) (photofenton) processes. In the photocatalytic degradation of dye by UV/ZnO process, effect of some parameters such as UV irradiation time, presence of ZnO and UV irradiation, pH, concentrations of ZnO, dye, H2O2 and ethanol was examined and first order reaction rate constant was calculated equal to 2.39×10-2 min-1 at experimental condition. The semi-log plot of dye concentration versus time was linear, suggesting first order reaction. Efficiency of photodegradation process in the absence of ZnO photocatalyst and UV light was small. Increasing the UV irradiation time increased AO7 removal. Ethanol had inhibitory effect on this process. Maximum AO7 removal was seen at neutral pH area. In the UV/H2O2 process, effect of some parameters such as presence of H2O2 and UV irradiation, amount of H2O2, effect of pH and addition of bicarbonate on the efficiency of dye removal were examined. Absence of each of UV irradiation or H2O2 decreased AO7 removal efficiency near to zero. Increasing H2O2 concentration increased dye removal to some extent but at higher H2O2 concentrations, dye removal efficiency did not increase. Increasing pH to value about 9 increased the AO7 removal efficiency and increasing bicarbonate anion concentration decreased it. Rate constant of AO7 removal by this process was calculated to be equal to 4.221×10-1 min-1 at experimental condition. Also, the order of UV/ H2O2/Fe (III) > UV/ H2O2 > UV/Fe (III) > H2O2/Fe (III), was seen for AO7 removal efficiency of these processes. Increasing Fe (III) and oxalate concentration increased dye removal efficiency.

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