Insights into the<i>p</i>-nitrophenol adsorption by amidoxime-modified poly(acrylonitrile-<i>co</i>-acrylic acid): characterization, kinetics, isotherm, thermodynamic, regeneration and mechanism study

Saber, Shihab Ezzuldin M.; Jamil, Siti Nurul Ain Md.; Abdullah, Luqman Chuah; Choong, Thomas Shean Yaw; Ting, Teo Ming

doi:10.1039/d0ra10910j

Cited by 22 publications

(2 citation statements)

References 82 publications

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“…This decline in removal efficiency with an increase in initial 4-NP concentration can be attributed to the potential saturation of adsorption sites on the LCA adsorbent. As the concentration of 4-NP in the solution rises, the available adsorption sites become saturated, leaving unadsorbed 4-NP in the aqueous solution [14]. These insights are crucial for understanding the behaviour of the adsorption system and for finding the best conditions for practical applications.…”

Section: Adsorption Studymentioning

confidence: 99%

Luffa Cylindrica Fibers Unveiled: A Sustainable Approach for 4-Nitrophenol Removal in Aqueous Solutions through Activated Carbon Utilization

JUSOH,

Azani,

Ghafar

et al. 2023

Malay. J. Catal.

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The prevalence of mutagenic and highly toxic compounds, such as 4-Nitrophenol (4-NP) and its derivatives, in industrial wastewater poses a significant environmental threat. This study emphasizes the critical need for public authorities to prioritize combating organic compound pollution for achieving sustainable development. The focus of this research is the preparation and evaluation of activated carbon adsorbents derived from Luffa cylindrica fibers (LC) for the efficient removal of 4-NP from aqueous solutions. The preparation involved carbonization process by heating LC in an argon furnace at 800℃, resulting in carbonized Luffa cylindrica fibers (LCC). Subsequently, chemical activation is performed using potassium hydroxide (KOH) solution, denoted as LCA. The properties of the adsorbent are identified through X-Ray Diffraction (XRD). To assess the removal efficiency of 4-NP, various parameters such as pH, adsorbent dosage, and 4-NP solution concentration are investigated. Optimal conditions for maximum 4-NP removal are achieved at a concentration of 50 mg/L, an adsorbent dosage of 0.75 mg/L (LCA), and a solution pH of 5. These conditions result in an impressive 99 % removal of 4-NP in 60 minutes. This study demonstrates the feasibility of utilizing locally available raw materials, such as LC fibers, to prepare an adsorbent with a robust adsorptive capacity for toxic pollutants like 4-NP. The findings underscore the potential of eco-friendly solutions in addressing environmental challenges and promoting sustainable practices in wastewater treatment.

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Section: Adsorption Studymentioning

confidence: 99%

Luffa Cylindrica Fibers Unveiled: A Sustainable Approach for 4-Nitrophenol Removal in Aqueous Solutions through Activated Carbon Utilization

JUSOH,

Azani,

Ghafar

et al. 2023

Malay. J. Catal.

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“…In another way, as temperature increases, the diffusive transfer of mass and solubility of CIP in water increase, weakening the adsorptive forces between adsorbent sites. As consequently, physical adsorption would be reduced and removal e ciency would be reduced (Saber et al 2021). Therefore, 15°C was selected for the subsequent experiments.…”

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confidence: 99%

Synthesis, characterization and swelling behavior of a novel bio-adsorbent based on pectin grafted poly (acrylic acid -co- itaconic acid) hydrogels for adsorption and controlled release of ciprofloxacin

Penyan,

Jassim

2024

Preprint

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In the current study, a novel bio-adsorbent based on pectin grafted poly (acrylic acid -co-itaconic acid) hydrogel is synthesized by free radical copolymerization using acrylic acid and itaconic acid as monomers grafted on natural pectin. N, N′-Methylenebisacrylamide is used as a crosslinking agent, and potassium persulfate as an initiator. Various techniques, such as FTIR, SEM, XRD, and TGA, were used to characterize the synthesized bio-adsorbent hydrogel. The effect of several variables on the swelling behavior of the synthesized hydrogel was examined, like cross linker amount, pectin amount, initiator amount, and monomers amount. Furthermore, the swelling process was investigated at various pH levels. In order to establish suitable adsorption conditions, several adsorption parameters were examined, such as pH, equilibrium time, adsorbent amount, and temperature. The adsorption data were examined using the Langmuir, Freundlich, and Temkin models. The results showed that the adsorption is typically heterogeneous and of the multilayer type, as they were more consistent with the Freundlich model. The adsorption process is exothermic and spontaneous, according to thermodynamic parameters measured. In vitro drug release experiment results showed that after 30 hours, the CIP drug was released significantly higher in the simulated intestinal fluid (pH = 7.4) than in the simulated stomach fluid (pH = 1.2). The drug release of CIP from the hydrogel was measured at different temperatures: 30°Cand 40°C. These findings demonstrate that the hydrogel is highly efficient in ciprofloxacin adsorption and pH sensitive, making it appropriate for drug delivery in the small intestine.

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Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

et al. 2022

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s: Acrylonitrile‐based adsorbents are effective candidates for metal ions removal from wastewater. However, their performance is often limited by their unsatisfied stability, reusability, and sorption efficiency. In this contribution, the amino group of urea was cross‐linked with the carboxyl group of the firstly formed AN (acrylonitrile) and AA (acrylic acid) copolymer to improve the strength, while the cyanide group of AN was dedicatedly reacted with hydroxylamine hydrochloride to obtain an amidoxime group endowing the strong adsorption capacity for Cu (II). The optimum adsorption conditions of the as‐prepared adsorbent for Cu (II) were at 25 °C and pH 7, which only consumed 60 min to reach the adsorption equilibrium. The theoretical maximum adsorption capacity was 176.717 mg g−1. The amidoxime group on the surface of the adsorbent was inherently entitled to the outstanding adsorption capacity. Langmuir and pseudo‐second‐order model fitted the adsorption process. Furthermore, there still retained 84.4 % of the original adsorption capacity after seven cycles. Under column adsorption, the adsorbed particles were surprisingly lumped together, which can be easily taken out entirely after adsorption for recycling collection. Overall, the obtained acrylonitrile‐based adsorbents, easily regenerated with high performance and excellent sorption efficiency, should be a promising sorbent.

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Insights into thep-nitrophenol adsorption by amidoxime-modified poly(acrylonitrile-co-acrylic acid): characterization, kinetics, isotherm, thermodynamic, regeneration and mechanism study

Abstract: This study performs an appraisal of the adsorptive capacity of amidoxime-modified poly(acrylonitrile-co-acrylic acid) for the p-nitrophenol (PNP) adsorption, from aqueous solutions.

Cited by 22 publications

References 82 publications

Luffa Cylindrica Fibers Unveiled: A Sustainable Approach for 4-Nitrophenol Removal in Aqueous Solutions through Activated Carbon Utilization

Luffa Cylindrica Fibers Unveiled: A Sustainable Approach for 4-Nitrophenol Removal in Aqueous Solutions through Activated Carbon Utilization

Synthesis, characterization and swelling behavior of a novel bio-adsorbent based on pectin grafted poly (acrylic acid -co- itaconic acid) hydrogels for adsorption and controlled release of ciprofloxacin

Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

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