Polyacrylamide-Grafted Actinidia deliciosa peels powder (PGADP) for the sequestration of crystal violet dye: isotherms, kinetics and thermodynamic studies

Abstract

Herein, a novel and eco-friendly low-cost adsorbent polyacrylamide-grafted Actinidia deliciosa (Kiwi fruit) peels powder (PGADP) was synthesized and utilized as a potential adsorbent for the sequestration of crystal violet (CV) dye from aqueous solution. The material was characterized by various analytical techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The adsorption process was carried out in a batch process with different concentrations, adsorbent doses, pH, contact time and temperatures. The maximum adsorption of CV dye from aqueous solution was observed at pH 7.3, contact time 180 min and initial dye concentration 20 mgL −1 . The equilibrium data were tested by applying various isotherms models such as Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R), and the results showed that Langmuir was found to be the best fitted model based on the highest correlation coefficient (R 2 ). Kinetic data showed that pseudo-second order model was best obeyed over wide range of concentrations. In thermodynamic study, positive value of ∆H o and negative value of ΔG° confirm endothermic and spontaneous nature of adsorption process with increased randomness at solid-solution interface. Desorption of CV dye was performed successfully using 1 M acetic acid with excellent regenerating capacity that lasts up to fourth cycle. Therefore, PGADP can be used effectively and economically for removal of CV dye from aqueous solution and industrial waste water.

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

“…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].…”

Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

“…To investigate the interaction between the amount absorbed and the chromium concentration at equilibrium, we used the theoretical models described in [21,22]. ermodynamic parameters, including the Gibbs-free energy (∆G°), enthalpy (∆H°), and entropy (∆S°), are the actual indicators for practical application of an adsorption process.…”

“…e Freundlich and Langmuir models are the most frequently used. In the present work, four models were used and described in [21,22]. All parameters of the isotherms were determined from the linear relation (Figures 15-18) according to the equations of the models described in [21,22].…”

“…In the present work, four models were used and described in [21,22]. All parameters of the isotherms were determined from the linear relation (Figures 15-18) according to the equations of the models described in [21,22]. e best-fit isotherms models were determined by calculating the determination coefficients (R 2 ).…”

Efficient and Selective Adsorption of Cationic Dye Malachite Green by Kiwi-Peel-Based Biosorbents

“…The development of a kiwi-peel-based biosorbent is not only a promising way to remove pollutants, but also an efficient solution for high-value-added utilization of kiwi peel waste [ 22 , 23 , 24 ]. Nevertheless, literature about kiwi-peel-based adsorbents was limited when compared with other fruit peels, especially with regard to their application in dye removal [ 25 , 26 , 27 ]. Moreover, research on developing a kiwi-peel-based adsorbent for selective removal of cationic dyes remained absent until now, and this topic requires further investigation.…”