Sono-assisted adsorption of Cristal Violet dye onto Tunisian Smectite Clay: Characterization, kinetics and adsorption isotherms

Hamza, Wiem; Dammak, N.; Hadjltaief, Haithem Bel; Eloussaief, Mabrouk; Benzina, Mourad

doi:10.1016/j.ecoenv.2018.07.021

Cited by 82 publications

(39 citation statements)

References 33 publications

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“…According to Mulugeta and Lelisa [43], the negative charges on the adsorbent surface facilitate and provide more active sites for the adsorption. This favorable adsorption at pH 10 was also reported and suggested by different studies [44][45][46]. Effect of initial MB concentration Figure 5a shows the effect of initial concentration on MB adsorption onto green and black NOS.…”

Section: Effect Of Phsupporting

confidence: 81%

Utilization of nano-olive stones in environmental remediation of methylene blue from water

Al-Ghouti

Dib

2020

J Environ Health Sci Engineer

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Background The use of agricultural waste as a low-cost adsorbent for the removal of hazardous methylene blue (MB) from aqueous solution was investigated. In this research, the potentiality of using black nano olive stones (black NOS) and green nano olive stones (green NOS) for MB adsorption was conducted. Methods Various remediation parameters such as initial MB concentration, pH, and temperature were investigated. Thermodynamic study was carried out to determine the homogeneity of the adsorbent and spontaneity of the adsorption process. Different physical and chemical characterizations were studied using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Brunauer-Emmett-Teller (BET) surface area, pore radius and pore volume. Results It was found that NOS exhibits an acidic nature, however the highest MB removal efficiency was recorded at pH 10; reaching up to 71%. The negative value of the heat of the adsorption process (ΔH°) indicated the reaction followed an exothermic pathway while the negative value of Gibbs adsorption (ΔG°) further suggested its spontaneous nature. The results indicated that the Freundlich model described well the adsorption process with 99.5% correlation coefficient for green NOS. FTIR was used to analyze functional groups on the adsorbents' surfaces that could play vital roles in the remediation process. SEM analysis revealed that the adsorbents comprised of abundant spherical deep cavities and porous nature. Conclusion The result obtained successfully demonstrated the potential of using black and green NOS as suitable adsorbents for the removal of MB from water.

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Section: Effect Of Phsupporting

confidence: 81%

Utilization of nano-olive stones in environmental remediation of methylene blue from water

Al-Ghouti

Dib

2020

J Environ Health Sci Engineer

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“…Overall, higher rate constants and adsorption capacities of PC‐UAA and PC@ZnO‐UAA showed a significant improvement after using the sono‐assisted activation, which indicates the efficiency of ultrasound power in wastewater treatment. In term of performance, ultrasound‐assisted method demonstrate that could be an effective and talented tool for dyes adsorption from aqueous solutions in contrast of conventional adsorption methods …”

Section: Resultsmentioning

confidence: 99%

“…Dyes are considered as hazardous pollutants causing serious environmental problems because of their toxicity, carcinogenicity and mutagenic properties, which threatens aquatic life and humans even at low concentrations . Many industrial activities discharge colored wastewaters, including dye manufacturing, tanneries, paper, leather, plastic, and food processing.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Porous Carbon@ZnO‐NPs for Organic Compounds Removal: Classical Adsorption Versus Ultrasound Assisted Adsorption

et al. 2019

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In this paper, the synthesis and characterization of porous carbon (PC) and porous carbon loaded ZnO nanoparticles (PC@ZnO) were investigated. The removal efficiency of Methylene Blue (MB) under ultrasound waves (UAA) and without ultrasound waves (SA) was studied considering the adsorbents dose, contact time, solution pH, temperature and initial dye concentration. Ultrasound irradiation have a positive effect on the removal efficiency of MB whereas ZnO nanoparticles incorporate in the surface of PC improve the regeneration efficiency of PC. PC@ZnO NPs shows high performance of MB removal using UAA, which was used for simultaneous removal of Crystal Violet (CV) and Congo Red (CR). The ultrasonic adsorption of CV/CR on PC@ZnO was found to be dependent on different parameters such as contact time, solution pH and initial dye concentration. The experimental results were found to follow the pseudo-second-order and Langmuir models. The adsorbed amount was found to be 64 mg g À 1 (for CR) and 109 mg g À 1 (for CV). Further, the effects of various parameters such as contact time, pH, initial dye concentration, and CV:CR ratio, were studied using central composite design coupled with response surface methodology. The data showed that the PC@ZnO has strong selective adsorption of CV dye in comparison to CR, and optimum conditions were found to be natural pH, 11.19 mg, (55:45%) of CV:CR ratio, 25 min and 30 mg L À 1 at adsorption temperature T = 25°C � 1. In these conditions, both dyes (CV and CR) are easily regenerated using HCl (0.1 M).

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“…On the other hand, the smectites are abundant clay minerals and have a high degree of isomorphic substitutions that generate a deficiency of positive charge and a high capacity of electrostatic interaction [35]. Besides being considered a low-cost adsorbent, it is also easily available, eco-friendly, non-toxic, and has a large surface area, cation exchange capacity, high porosity, and active sites in its surface [36][37][38], which gives it dye adsorption capacity. However, its deficiency of positive charge impairs the adsorption of anionic dyes, even in environments with acid pHs, hampering its applicability in the treatment of waters contaminated with such dyes.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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The efficiency of acid treatment on natural calcium bentonite (natural bentonite) for anionic dye adsorption was investigated using methyl orange (MO) as a probe. Additionally, adsorption experiments were accomplished between the natural bentonite, acidified bentonite, and a cationic dye (methylene blue, MB). Acid functionalization in natural bentonite (RF) was carried out with HCl and H2SO4 acids (RF1 and RF2, respectively). The samples were characterized by chemical analysis, mineralogy, particle size, and thermal behavior with the associated mass losses. The adsorption efficiency of MO and MB dyes was investigated by the effects of the initial concentration of adsorbate (Ci) and the contact time (tc). The acid treatment was efficient for increasing the adsorption capacity of the anionic dye, and the Qmaxexp values measured were 2.2 mg/g, 67.4 mg/g e 47.8 mg/g to RF, RF1 e RF2, respectively. On the other hand, the acid functionalization of bentonite did not significantly modify the MB dye adsorption. The Sips equation was the best fit for the adsorption isotherms. Thus, we found that the acid-functionalized bentonite increases the anionic dye adsorption by up to 8000%. The increased adsorptive capacity of acidified bentonite was explained in terms of electrostatic attraction between the clay surface and the dye molecule.

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Sono-assisted adsorption of Cristal Violet dye onto Tunisian Smectite Clay: Characterization, kinetics and adsorption isotherms

Cited by 82 publications

References 33 publications

Utilization of nano-olive stones in environmental remediation of methylene blue from water

Utilization of nano-olive stones in environmental remediation of methylene blue from water

Preparation and Characterization of Porous Carbon@ZnO‐NPs for Organic Compounds Removal: Classical Adsorption Versus Ultrasound Assisted Adsorption

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

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