Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration

Lafi, Ridha; Montasser, Imed; Hafiane, Amor

doi:10.1177/0263617418819227

Cited by 240 publications

(122 citation statements)

References 47 publications

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“…It was observed that the removal of congo red is more efficient in acidic solution in which congo red dissociates to sulfonic group (ÀSO À 3 ) (electronic supplementary material, figure S13) [67]. The carbonaceous surface of CSC is positive in acidic medium, hence the induced electrostatic interactions between the dye and the adsorbent favoured the adsorption of the dye onto the CSCs [68]. Similar results have been obtained for the adsorption of congo red onto activated carbons [68,69].…”

Section: Adsorption Kineticsmentioning

confidence: 56%

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

et al. 2020

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Highly porous carbon-silica composites (CSC) were prepared for the first time through a simple wet impregnation process and subsequent pyrolysis of low-value sugarcane by-products, namely molasses. These CSC materials demonstrate a distinct range of functionalities, which significantly differ from similar materials published in the literature. Importantly, the carbon-silica composites prepared at 800°C exhibited exceptional adsorption capacities for the azo-dye congo red (445 mg g −1 ), due to the graphitic carbon coating and unique functionality including C-O-C within the porous structure. Congo red adsorption capacity of the highly mesoporous graphitic carbon-silica composites significantly exceeds that of commercial activated carbon and silica, these carbon-silica composites therefore represent an effective step towards the development of porous bio-derived adsorbent for remediation of dye wastewaters. Both the porous properties (surface area and pore size distribution) and the functionality of the carbon coating were dependent on the temperature of preparation. The sustainable synthetic methods employed led to a versatile material that inherited the mesoporosity characteristics from the parent silica, demonstrating mesoporous volumes greater than 90% (as calculated from the total pore volume). Adsorption on the 800°C prepared carbon-silica composites demonstrated an excellent fit with the Langmuir isotherm and the pseudo-first-order kinetic model.

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Section: Adsorption Kineticsmentioning

confidence: 56%

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

et al. 2020

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“…Among them, adsorption has been widespread application due to its simple operation, low operating costs, and high efficiency. Carbon material is a traditional adsorbent material due to its high adsorption capacity, in which activated carbon is the most widely used as adsorbent (Abbas and Harrache, 2019; Huang et al., 2012; Lafi et al., 2019; Streit et al., 2019; Wu et al., 2019). However, most of these carbon materials are microporous structures and more expensive, which limits their application in polymer dyes removal.…”

Section: Introductionmentioning

confidence: 99%

Adsorption performance of basic fuchsin on alkali-activated diatomite

Zhao

Geng

Cai

et al. 2020

Adsorption Science & Technology

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The natural diatomite was treated with NaOH to obtain alkali-activated diatomite. The materials were systematically characterized by X-ray powder diffraction, X-ray fluorescence, Fourier transform infrared spectroscopic, scanning electron microscopy, and N2 adsorption–desorption. Meanwhile, the potential use of alkali-activated diatomite as adsorbent for the removal of basic fuchsin from aqueous solution was assessed by batch experiment. Results indicated that the structure and textural properties of diatomite were obviously changed via alkali activation, and then affecting its adsorption performance. The adsorption capacity of alkali-activated diatomite for basic fuchsin was higher than that of natural diatomite. In the case of alkali-activated diatomite, its adsorption capacity was increased with increasing the activation temperature, and the diatomite activated at 115°C (alkali-activated diatomite-115) exhibited the maximum adsorption capacity. The pseudo-first-order kinetics and the Sips isotherm model were preferable to describe the adsorption process of basic fuchsin on alkali-activated diatomite-115 and the thermodynamic parameters indicated that the adsorption process was endothermic and spontaneous.

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“…Congo red molecules are positively charged (CR + ) under acidic conditions and negatively charged (CR − ) under alkaline conditions [49]. With the increase of pH, oxygen-containing functional groups (-COOH) will be negatively charged due to deprotonation (-COO − ) [50]. Therefore, we can conclude that there is electrostatic attraction between the congo red molecules and the carboxyl groups of the adsorbent at acidic pH, and electrostatic repulsion at basic pH.…”

Section: Adsorption Mechanismsmentioning

confidence: 99%

Biosorbents prepared from pomelo peel by hydrothermal technique and its adsorption properties for congo red

Zheng

Sun

et al. 2020

Mater. Res. Express

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A new kind of biosorbent was prepared from pomelo peel by using potassium hydroxide as activating agent and hydrothermal treatment method. The characteristics of materials were analyzed by SEM, BET and FTIR. Increasing the adsorbent dosage (from 2.5 to 17.5 g l −1 ) and contents of congo red in solution (from 20 to 50 mg l −1 ) cause the increment of removal rate of congo red. On the other side, the removal rate is decrement with rising of temperature and pH. The maximum adsorption quantity of biosorbent was 144.93 mg g −1 at 303 K, which calculated by Langmuir model. The pseudo-firstorder kinetic model, pseudo-second-order kinetic model and intra-particle diffusion model were used to explain adsorption process. The value of Gibbs free energy (ΔG) is −7.63 (kJ/mol) at 303 K and the enthalpy change (ΔH) is −31.43 (kJ/mol), meaning that adsorption behavior for congo red is spontaneous.

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Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration

Cited by 240 publications

References 47 publications

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

Adsorption performance of basic fuchsin on alkali-activated diatomite

Biosorbents prepared from pomelo peel by hydrothermal technique and its adsorption properties for congo red

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