Adsorptive removal of dye from real textile wastewater using graphene oxide produced via modifications of hummers method

The present study reports a simple co-precipitation approach for the synthesis of SnO 2 nanorods. The SnO 2 nanorods were characterized by XRD, SEM, TEM, EDAX, SAED, and FTIR techniques, to examine their structural, morphological, functional group, and elemental properties. The findings of the SEM and TEM reveal the nanorod like morphology. For the adsorptive and photocatalytic removal of methylene blue dye from their aqueous solution the synthesized SnO 2 nanorods have been used. The effect on adsorptive and the photocatalytic removal capability of SnO 2 nanorods was examined by optimizing the various parameters such as pH, initial dye concentration, contact time and catalyst dose. Tha maximum adsorptive and photocatalytic removal of MB up to the 66% and 94% were obtained at pH = 7 and pH = 2, respectively. Besides, experimental adsorption results were used for the exploration of kinetics and adsorption isotherm (Langmuir and Freundlich), which shows that methylene blue adsorption over SnO 2 nanorods follows the pseudo-second-order kinetics with the rate constant K 2 is 1.1 × 10 −1 (g/mg/min) and obeys the Langmuir isotherm. However, the thermodynamic parameters were studied, indicating that adsorption is spontaneous and favorable. The adsorptive removal is an endothermic process and pointing towards the chemisorptions nature of the process.

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“…The pseudofirst-order kinetic model for the photocatalytic removal of MB is given as in Eq. 6 [49,50].…”

Section: Kinetics Studymentioning

confidence: 99%

Adsorptive and photocatalytic removal of carcinogenic methylene blue dye by SnO2 nanorods: an equilibrium, kinetic and thermodynamics exploration

et al. 2020

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“…COD was determined from the closed reflux tube method (5220D). Two equations were used to investigate the kinetic studies, number (2) for pseudo-first-order (PFO) and (3) for pseudo-second-order (PSO) [18,19]. e Langmuir isotherm admits that adsorptions happen at specific homogeneous active sites on the adsorbent surface; (4) is its corresponding equation, where K L is the Langmuir constant (L•mg −1 ) [20].…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Adsorption Studies on the Removal of Textile Effluent over Two Natural Eco-Friendly Adsorbents

Assila

Tanji

Zouheir

et al. 2020

Journal of Chemistry

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This study investigates the possibility of applying an adsorption process using two abundant natural minerals M1 and M2. Without pretreatment or activation, the adsorbents were used to treat real textile wastewater samples (collected from Fez city, Morocco). As a cost-effective alternative, these materials were characterized by different analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray fluorescence (XRF). Chemical oxygen demand (COD) and biological oxygen demand (BOD) were used to characterize the textile wastewater. Additionally, the influence of operating conditions (contact time, adsorbent dosages, and pH) was evaluated. Results show that the adsorption process takes place quickly, reaching the equilibrium at 90 and 160 min for M1 (88% COD) and M2 (79% COD). Both materials show a higher affinity to Cr (39%) and lower affinity to Cu (28%). A pseudo-second-order kinetic model provides the best fit to the experimental adsorption data. Germination tests indicate a low toxicity after the adsorption process. Performance of both materials was compared with that of other literature studies.

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“…GO structure was observed by using different techniques. To determine the pH at the point of zero charge (pH PZC ), the experiment of 11 points was performed, [19,20,24] and the final pH value was determined using a bench pH meter type PHTEK, PHS-3B (Quimis, Brazil). Fourier transform infrared spectroscopy (FTIR) was carried out using a spectrometer model Tensor 27 (Brucker) with total attenuated reflectance (ATR) and wavenumber ranging from 500-4000 cm −1 .…”

Section: Production and Characterization Of Graphene Oxidementioning

confidence: 99%

“…According to previous studies that used graphene oxide to remove dyes from water, depending on the type of dye (cationic, anionic, azo, or reactive), adsorption onto GO is a physical phenomenon, which might occur by both electrostatic interactions with functional groups and/or π-π interactions. [13,16,[18][19][20][21][22] This significant physical attraction between the dyes and GO facilitates the colour removing process, making it quick. According to Yang et al, [16] MB adsorption onto GO reaches the equilibrium almost immediately, as the GO-MB complex aggregates and precipitates within a few seconds.…”

Section: Kinetics Of Contaminants Removal Using Gomentioning

confidence: 99%

“…[17] Studies examining the application of GO in adsorptive processes that only consider the removal of dyes in water have been widely reported. The application of GBM in the adsorptive removal of direct, reactive, [18] anionic, and cationic [13,16,[19][20][21][22] dyes from water has been investigated and has shown promising results. Nevertheless, the investigation of these materials as a means of treating real textile wastewater samples is still limited.…”

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confidence: 99%

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Real textile wastewater treatment using nano graphene‐based materials: Optimum pH, dosage, and kinetics for colour and turbidity removal

et al. 2020

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Textile effluent is one of the most hazardous types of wastewater for both the environment and human health when discharged without proper treatment.This work stands out as one of the first to evaluate the parameters for the application of graphene oxide (GO) to treat real textile wastewater. A comparative analysis was conducted to investigate the removal efficiencies of turbidity and apparent colour from raw textile wastewater using GO. The effects of different parameters, such as GO dosage, pH, and contact time were discussed, considering a removal mechanism based on the salting out effect. Results regarding treatment using GO followed by centrifugation showed that in >1 hour nearly 90% turbidity was decreased, and an apparent colour removal efficiency over 76% was recorded, which is twice the value obtained with the conventional treatment applied in textile mills. Over 60% chemical oxygen demand was reduced. Tests using GO followed by sedimentation also revealed promising results, showing removal efficiencies of 66% and 88% for apparent colour and turbidity, respectively. These results suggest that GO could be promising for real wastewater treatment. K E Y W O R D Sapparent colour, graphene oxide, salting out effect, textile wastewater, turbidity

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Adsorptive removal of dye from real textile wastewater using graphene oxide produced via modifications of hummers method

Cited by 48 publications

References 32 publications

Adsorptive and photocatalytic removal of carcinogenic methylene blue dye by SnO2 nanorods: an equilibrium, kinetic and thermodynamics exploration

Adsorptive and photocatalytic removal of carcinogenic methylene blue dye by SnO2 nanorods: an equilibrium, kinetic and thermodynamics exploration

Adsorption Studies on the Removal of Textile Effluent over Two Natural Eco-Friendly Adsorbents

Real textile wastewater treatment using nano graphene‐based materials: Optimum pH, dosage, and kinetics for colour and turbidity removal

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