Adsorption of dyes using activated carbon derived from pyrolysis of vetiveria zizanioides in a fixed bed reactor

Tyagi, Uplabdhi

doi:10.1016/j.gsd.2019.100303

Cited by 23 publications

(5 citation statements)

References 49 publications

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“…The increase in industrial production and the world population has also increased water contamination from industrial and domestic sources [1]. Effluents derived from the textile, food, plastics, and cosmetics industries are rich in dyes [2,3]. Dyes have a complex structure, are stable to light and heat, can be highly toxic, potentially carcinogenic, and mutagenic [4], and rapidly accumulate in living cells and damage human health [5,6].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water

et al. 2021

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The effect of acid treatment on the adsorptive capacity of a Brazilian palygorskite to remove the crystal violet (CV) and congo red (CR) dyes was investigated. The raw palygorskite was acid-treated by different HCl solutions (2, 4, and 6 mol/L). The modifications on the palygorskite structure were investigated using X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy, N2 adsorption/desorption, and thermogravimetric and differential thermal analysis. The efficiency of CV and CR adsorption was investigated, and the effect of the initial concentration, contact time, pH, and adsorbent amount was analyzed. The results revealed that CV adsorption in the acid-treated palygorskite was higher than that of the raw material. A Langmuir isotherm model was observed for the adsorption behavior of CV, while a Freundlich isotherm model was verified for the CR adsorption. A pseudo-second-order model was observed for the adsorption kinetics of both dyes. The higher CV adsorption capacity was observed at basic pH, higher than 97%, and the higher CR removal was observed at acidic pH, higher than 50%. The adsorption parameters of enthalpy (ΔH), entropy (ΔS), and Gibbs energy (ΔG) were evaluated. The adsorption process of the CV and CR dyes on the raw and acid-treated Brazilian palygorskite was predominantly endothermic and occurred spontaneously. The studied raw palygorskite has a mild-adsorption capacity to remove anionic dyes, while acid-treated samples effectively remove cationic dyes.

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Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water

et al. 2021

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“…XRD study reveals the presence of microcrystalline structure of graphite (layer by layer structure) which make it attractive for adsorption. 38 The adsorption study was performed by batch method to optimized contact time of adsorbent, solution temperature and concentration of dye solution. The results reveal that 238 mg of RB dye was removed per gram of WS adsorbent.…”

Section: Discussionmentioning

confidence: 99%

Assessment and development of carbonaceous soot from wood burning process: adsorption, kinetics and thermodynamics study for Rhodamine B dye

Hussain¹

2020

OAJS

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Carbon based materials have acquired pivotal importance in the recent era for the removal of pollutants from the effluents. In this study, wooden soot (WS) obtained from wood burning has been utilized as an adsorbent for the removal of Rhodamine B dye (RB). The adsorption of RB on WS was studied as function of the contact time, concentration, and temperature. The amount of dye adsorbed onto the WS increased with the increase in the contact time, concentration and temperature. The adsorption data fitted well in Langmuir and Freundlich models with comparatively greater R2 value for the Langmuir model. Adsorption data followed the pseudo second order kinetics. The uptake of dye by the adsorbent was 238 mg/g. The various Thermodynamic parameters such as ∆Ho, ∆So and ∆Go were studied which indicated that the adsorption of RB on WS adsorbent remained a spontaneous endothermic process. The surface morphology was studied through FESEM before and after the adsorption of RB, which indicated accumulation of dye on to the small pores. The functional group analysis was performed through FT-IR which indicated a clear change at 2360 cm-1 after the adsorption which confirmed the adsorption phenomena. The pore size, pore volume and pore diameter were 47.44 m2/g, 0.07 cm3/g and 35.23 A0 respectively. This study will highly acknowledge the use of low cost adsorbent materials for the environmental remediation.

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“…Conversely, the pseudosecond-order model represents that one target dye molecule or ion occupies two active sites. 61 The linear description of the two kinetics is Equations ( 6) and (7). Pseudo-first-order adsorption kinetic model expressions:…”

Section: Adsorption Kinetics and Isothermsmentioning

confidence: 99%

“…5,6 In addition, the degradation of dyes can release disease-causing or carcinogenic substances, such as azo dyes, which cause health risks including cancer, allergies, tumors, skin irritation, and heart effects, when contaminated water sources. 7,8 Dyes can be categorized based on their chemical structure into anionic dyes (including direct dyes, acid dyes, and reactive dyes), cationic dyes (such as basic dyes) and non-ionic dyes (like disperse dyes). 9 It is worth mentioning that reactive dyes play a significant role in the textile industry, with Reactive Red 195 (RR-195) being a notable example.…”

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confidence: 99%

Poly(PEI‐catechol‐tetraethylenepentamine) was prepared by “one‐pot method” for removing Reactive Red 195

Liang,

Lu,

Gao

et al. 2023

J of Applied Polymer Sci

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Wastewater containing dyes is frequently discharged by industrial processes and needs separation and recycling. To solve this problem, it is important to research and develop environmentally friendly, efficient adsorbent materials for pollutant separation and recovery. In this study, a poly(PEI‐catechol‐tetraethylenepentamine) (PPCT) adsorbent was synthesized using a simple catecholamine reaction. This adsorbent exhibited high adsorption capacity and excellent removal efficiency for Reactive Red 195 (RR‐195) in wastewater. The material was characterized using SEM, FT‐IR, TGA, EA, and XPS. Its performance was optimized by varying the type of polyethyleneimine and the amount added during the preparation process. The effects of temperature, pH, contact time, and salt concentration on the adsorption were systematically investigated. Additionally, the experimental data showed consistency with both the Langmuir and pseudo‐second‐order kinetic models, simultaneously. The maximum adsorption capacity can reach 1754 mg g−1 at 303 K, with a retention rate of 86.6% after two cycles. The removal rate exceeds 98% at a concentration of 400 mg g−1 or lower. Additionally, the protonated amine group in PPCT carries a positive charge under acidic conditions, enabling selective adsorption of the anionic dye RR‐195. Consequently, PPCT exhibits an excellent adsorption effect on RR‐195 and holds promising applications in pollutant removal.

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Adsorption of dyes using activated carbon derived from pyrolysis of vetiveria zizanioides in a fixed bed reactor

Cited by 23 publications

References 49 publications

Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water

Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water

Assessment and development of carbonaceous soot from wood burning process: adsorption, kinetics and thermodynamics study for Rhodamine B dye

Poly(PEI‐catechol‐tetraethylenepentamine) was prepared by “one‐pot method” for removing Reactive Red 195

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