One-step processing of low-cost and superb natural magnetic adsorbent: kinetics and thermodynamics investigation for dye removal from textile wastewater

Electrocoagulation (EC) of a synthetic ternary dye mixture was investigated using sacrificial iron electrodes. Erionyl Red (ER), Isolan Bordeaux (IB), and Remazol Red (RR) textile dyes were used for preparing the ternary solution. Different operational parameters, including initial dye concentrations, salt amount, current density, EC time, and pH, were analyzed to optimize removal efficiency and energy consumption conditions. After EC treatment, the individual remaining dye concentrations were calculated by applying classical least squares (CLS). The fastest removed dye was RR and the obtained efficiency was the highest as compared to the other two dyes. The energy consumption was also investigated.

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“…The plot ln( q e – q t ) versus t slope equals k 1 , and the intercept equals ln q e 31. The pseudo‐second‐order equation can be written as 32:

true \frac{t}{q_{normalt}} = \frac{1}{k_{2} q_{normale}^{2}} + \frac{1}{q_{normale}} t

…”

Section: Resultsmentioning

confidence: 99%

Individual Dye Removal Efficiencies in a Ternary Dye Mixture by Electrocoagulation

2022

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“…As the dye concentration increases, the adsorbent reaches saturation quickly for a fixed amount of adsorbent, and the active surfaces are covered with dye molecules. According to Sanad et al 36 , at high dye concentrations, the unit mass of the adsorbent is exposed to more dye molecules. As a result, the active sites are gradually filled until they reach saturation causing a decrease in removal efficiency.…”

Section: Effect Of Initial Dye Concentration and Contact Timementioning

confidence: 99%

Removal of Diazo Dye Direct Red 28 and Tetra Azo Dye Direct Black 22 Using Synthesized Magnetic Kaolin Supported Zinc Ferrite

Fındık

2022

ACSi

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The presence of dye molecules in water resources has harmful effects on environment. Therefore, it is important to remove dyes from wastewater using eco-friendly materials. In this study, adsorptive removal of diazo dye Direct Red 28 (DR-28) and tetra azo dye Direct Black 22 (DB-22) was investigated by using a new composite, kaolin supported zinc ferrite (KZF) as adsorbent. Characteristics of the composite, KZF were determined using various techniques such as FTIR, SEM, XRD, VSM, and EDS/Mapping. The adsorption of DR-28 and DB-22 on KZF was studied as a function of contact time, initial dye concentration, adsorbent amount, temperature, initial pH of the solution as well as the heat treatment of the composite. The removal of DR-28 was found to be 92.4% for the KZF concentration of 1g/200mL, initial dye concentration of 20 mg/L, contact time of 120 min at original pH and 21 °C. On the other hand the removal of DB-22 was found to be 91.7% under the same conditions at 40 °C. The results showed that Langmuir isotherm is suitable for the adsorption of DR-28 and DB-22 on KZF under given conditions. It was found that adsorption of DR-28 on KZF was exothermic while that of DB-22 was endothermic. The enthalpy changes (ΔH0) for the adsorption of DR-28 and DB-22 dyes on KZF were found to be –24.59 kJ/mol and 61.95 kJ/mol respectively. ΔS0 for the adsorption of DR-28 dye was found to be negative while ΔS0 for the adsorption of DB-22 was positive. The kinetic data fitted well to the pseudo second order model for the adsorption of DR-28 and DB-22 on KZF composite. These results showed that the prepared adsorbent KZF could be used as an adsorbent for the efficient removal of anionic dyes.

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“…It maycause dissociation of theadsorbent sites and changes of the solution chemistry ofmetal ions and dye. It may be distribute the surface charge on the adsorbent surface (Sanad et al, 2021). Fig.…”

Section: Effect Of Phmentioning

confidence: 99%

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

Attia¹,

Farghaly²,

Saleh³

et al. 2022

Physicochem. Probl. Miner. Process.

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The marble dust as a harmful industrial waste of marble fabrication was evaluated as aneconomical and efficient green adsorbent for Acid Red-1 dye and lead ions. The XRD, XRF, particle size, surface area and zeta-potential measurements were used to characterize the marble dust. The removal efficiency was optimized by studying several parameters such as pH, temperature, contact time, adsorbent dose and initial concentration. The optimum removal was achieved at pH 6, 20C after 60 min in the presence of 2.5g/L marble dust. The rates of adsorption were found to follow the pseudo-second-order model. The results showed better fitting to Freundlich isotherm. The thermodynamic studies revealed that the adsorption process is spontaneous, exothermic and favorable at low temperature. The free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes were calculated to predict the nature of adsorption.The removal efficiency was improved by calcination of the marble at 700C. Application for textilewastewater showed high removal efficiency up to 99.9%of inorganic and organic pollutants. The product of treatment was used in the concrete and bricks manufactured, so there is nogeneration of second-order pollutants.

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One-step processing of low-cost and superb natural magnetic adsorbent: kinetics and thermodynamics investigation for dye removal from textile wastewater

Cited by 50 publications

References 70 publications

Individual Dye Removal Efficiencies in a Ternary Dye Mixture by Electrocoagulation

Individual Dye Removal Efficiencies in a Ternary Dye Mixture by Electrocoagulation

Removal of Diazo Dye Direct Red 28 and Tetra Azo Dye Direct Black 22 Using Synthesized Magnetic Kaolin Supported Zinc Ferrite

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

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