Reactive Blue 5G Adsorption onto Activated Carbon: Kinetics and Equilibrium

Abstract

Adsorption studies are essential before implementation in an industrial plant. We studied the Reactive Blue 5G removal by activated carbon from Pinus sp. Physical and chemical characteristics of the adsorbent were evaluated with N2 adsorption/desorption experiments at 77 K, and equilibrium and kinetics studies were performed in a batch reactor at several temperatures and pH values. Our results showed that the activated carbon had a high surface area, effective diffusion coefficients were of the order of 10–12 cm2·s–1, and mass transfer coefficients were present in both fluid and solid phases. Equilibrium and kinetics experiments confirmed that pH and temperature play an important role: the dye uptake became higher as the temperature and pH decreased, and the optimum removal was at 303 K and pH 2. Finally, thermodynamics analysis suggested that the process is exothermic and chemical in nature. In summary, we showed that activated carbon can be more effective than other adsorbents already used to remove the Reactive Blue 5G from wastewater.

Adsorption of methylene blue and eosin yellow using porous carbon prepared from tea waste: Adsorption equilibrium, kinetics and thermodynamics study

“…Activated carbon (AC) has been found to be 19 the most widely used adsorbent for waste water treatment 20 [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Research interests have therefore been growing for the 21 production of porous carbon from agricultural wastes for removal 22 of dyes from wastewater [28][29][30][31][32][33][34][35][36][37][38][39]. In the recent past, several 23 materials from agricultural waste such as coconut coir, rice husk, 24 wheat straw, sawdust, nutshells, etc.…”

“…In the recent past, several 23 materials from agricultural waste such as coconut coir, rice husk, 24 wheat straw, sawdust, nutshells, etc. have been used for the 25 preparation of AC and used as adsorbents for the removal of dyes 26 and other pollutants from waste water systems [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Recently, 27 we have reported our preliminary results on the synthesis of 28 porous carbon from tea leaves and its use for chromium adsorption 29 [40].…”

“…The as synthesized 33 PC has been utilized for adsorptive removal of both cationic dye 34 (methylene blue) as well as anionic dye (eosin yellow). Various 35 experimental parameters viz., initial dye concentration, contact 36 time, adsorbent dose, solution pH and temperature were studied 37 via batch technique. The usefulness of pseudo-first-order and 38 pseudo-second-order kinetic models was evaluated and applica- 39 bility of Langmuir and Freundlich isotherm models to understand 40 the adsorption mechanism of both cationic and anionic dye onto Different form of tea (black, green and waste) used as carbon 48 precursors were collected from commercial source and household 49 uses.…”

Removal of Lissamine rhodamine B and acid orange 10 from aqueous solution using activated carbon/surfactant: Process optimization, kinetics and equilibrium

“…So the overall adsorption process was jointly controlled by the intraparticle and external mass transfer diffusion. Martins et al [24] reported similar trends for reactive blue 5G adsorption onto AC. In addition, the k di values of LRB and AO10 increased with increasing their initial concentrations (Table 3S), indicating that the increased driving force at high initial concentrations of dye could enhance the intraparticle diffusion of two dyes onto AC/DDAC.…”

Removal of hazardous azopyrazole dye from an aqueous solution using rice straw as a waste adsorbent: Kinetic, equilibrium and thermodynamic studies

“…Activated carbons is perhaps the most widely used adsorbent in the adsorption processes due to its high specific surface area and high adsorption capacity [22,23]. Recently, increasing attention was paid on the development of highly effective and low cost adsorbents.…”