Recent Advances in Adsorption Kinetic Models: Their Application to Dye Types

Benjellοun, Mohammed; Miyah, Youssef; Evrendilek, Gülsün Akdemir; Zerrouq, Farid; Lairini, Sanae

doi:10.1016/j.arabjc.2021.103031

Cited by 236 publications

(127 citation statements)

References 161 publications

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“…At the end of the experiments, the equilibrium pH was measured and found to be constant, around 7 for each adsorbent. The equilibrium sorption of MB was evaluated according to the Langmuir and Freundlich isotherm models, since these models can help to explain the adsorption mechanism and the heterogeneity of the adsorbent surface [15,48,57].…”

Section: Isotherm Modelsmentioning

confidence: 99%

“…Both equations have been widely applied to explain the experimental results obtained for aqueous pollutants such as dyes and metal ions [15,48,57] The pseudo-first-order kinetic model is expressed by Equation ( 5):…”

Section: Kinetic Modelsmentioning

confidence: 99%

“…Adsorption is an attractive method for removing pollutants from effluents as it is a flexible process in terms of design and operation and produces pollutant-free effluents that are suitable for reuse [13,14]. The efficiency of the adsorption process depends on the characteristics of the solution medium, the adsorbate, and the adsorbent [15,16]. An ideal adsorbent should have a porous structure, a large specific surface area, good physical, mechanical and chemical stability, and high affinity for the adsorbate [17]; therefore, research on materials that are both efficient and economical should be encouraged.…”

Section: Introductionmentioning

confidence: 99%

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Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

et al. 2021

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Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO3/TiO2 semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. These compounds were combined to form cylindrical extrudates of 0.2 cm (diameter) and 1.0 cm (length). The adsorption characteristics of the composites were measured using batch sorption studies as a function of pH, initial concentration, and contact time. The pseudo-second-order model and the Langmuir isotherm model were better suited to the adsorption process. The equilibrium state was achieved around 180 min of adsorption, and a pH of 7 was established as the optimal operating condition. The maximum adsorption values of the dye were obtained with the composites derived from G-Clay, whose average adsorption capacity was 46.36 mg g−1, in contrast with composites derived from R-Clay, whose average adsorption value was 36.24 mg g−1. The results reflect that synthesized composites could be used potentially for the removal of cationic dye from wastewater.

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Section: Isotherm Modelsmentioning

confidence: 99%

Section: Kinetic Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

et al. 2021

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“…Ionic dyes generally pose a higher risk, which is due to their reactivity and carcinogenic nature [5,7]. According to their colour and the functional group attached to the chemical structure, there exist chromophore dyes (azo, anthraquinone, indigo, xanthenes, phthalocyanine, nitrated, and nitrosated and triphenylmethane dyes) or auxochrome dyes (they contain acid or anionic dyes, basic or cationic dyes, vat dyes, direct dyes, mordant dyes, reactive dyes, azo dyes, and dispersed dyes) [3,6,8].…”

Section: Classification Of Dyesmentioning

confidence: 99%

Preliminary Study Into the Decolorization of Selected Dyes By the Ozone Application

Gerulová

Sanny

Kucmanová

et al. 2021

Research Papers Faculty of Materials Science and Technology Slovak University of Technology

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Synthetic dyes widely used in many kinds of industry affect the colour of wastewater when released to environment due to insufficient treatment in typical sewage treatment plants. Only a small dose of those dyes may significantly affect colour of water and, according to the chemical composition, may pose risks to wildlife and humans. In the research described in this study, decolorization of three various dyes was investigated. Since colour removal of Congo Red such as Methylene blue using ozone have been reported by several authors, and the literature on Naphthol Green B is rather limited, in the present study we compare the decolorization rate of CR, MB and NGB. The colour removal occurred quickly and more than 90% of colour reduction was achieved within 3-6 minutes throughout all tested pH of the solution.

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“…The dyes in the effluent water from the textile, paper, pulp and dyeing industries should be removed before discarding the effluent into water systems [Tara et al, 2020]. It was reported that about "5,000-10,000" tons of dye are discharged into the water system every year [Benjelloun et al, 2021]. The dyes in water are detectably visible and can affect the color, taste and odor of the water.…”

Section: Introductionmentioning

confidence: 99%

The Use of Pre-Heated Black Cumin Seeds (<i>Nigella sativa</i>) for Sorption Basic Dyes from Aqueous Solutions

Hassan¹,

Al-Isawi²,

Saleh³

2021

J. Ecol. Eng.

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The discharge of industrial effluents containing dyes such as methylene blue (MB) and safranine T (ST) into water resources has caused serious problems for humans and organisms which live in water. On the other hand, the seeds of nigella sativa have been known to be effective and economical materials that present an excellent performance of dye removal from various types of wastewater. In this study, a different method from the existing literature was used, where the black cumin seeds (HBCS) were heated for a twenty-four hour period at 85 °C and ground to 300 µm particle size to obtain new adsorbents for (MB) and (ST) dye adsorption from aqueous solutions. Four operating variables, which show a strong impact on adsorption, were tested by conducting a batch mode adsorption experiment and these were: the dye solution's initial pH (pH), the contact time (t), the initial concentration of the dye (C o ), and the mass of the adsorbent (m a ). The sorption capacity of the adsorbent (q) and the dye removal efficiency (% Rem) were utilized as indicators of the impacts of selected operating variables on adsorption processes. It was found that the adsorption of MB and ST dyes increased when the initial concentration of the solution is higher. The adsorption of MB and ST dyes onto HBCS with initial concentration of 50 mg/L was 3.39 mg/g and 4.36 mg/g, respectively. The equilibrium values for the MB and ST dyes corresponded with the Freundlich isotherm model onto HBCS highlighting the multi-layer adsorption process occurring which describes the interactions between the modified HBCS and the two dyes. The findings demonstrate that the optimum adsorption processes of the MB and ST dyes accrued in the 120 minutes and obtained at pH 10.7 and 11 for MB and ST, respectively. These conditions provide a negative charge for the surface of HBCS, causing its attraction to the positive charge of the MB and ST dyes. Kinetic studies elucidated that the MB and ST dyes adsorption onto HBCS most corresponded with pseudo-second order. The findings of this study could be implemented functionally in the industrial wastewater treatment sector.

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Recent Advances in Adsorption Kinetic Models: Their Application to Dye Types

Cited by 236 publications

References 161 publications

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

Preliminary Study Into the Decolorization of Selected Dyes By the Ozone Application

The Use of Pre-Heated Black Cumin Seeds (<i>Nigella sativa</i>) for Sorption Basic Dyes from Aqueous Solutions

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