Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Adeyi, Abel Adekanmi; Jamil, Siti Nurul Ain Md.; Abdullah, Luqman Chuah; Choong, Thomas Shean Yaw; Lau, Kia Li; Abdullah, Mohammad

doi:10.3390/ma12111734

Cited by 51 publications

(31 citation statements)

References 58 publications

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“…It indicates the amount of lead (Pb 2+ ) adsorbed by the CDs and the residual lead in the bulk solution at room temperature [49]. The equilibrium isotherms were obtained graphically by plotting solid phase concentration against liquid phase concentration [50].…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…Langmuir forms can be correlated with the variation of the suitable area and porosity of the adsorbent. Availability of CDs at nano dimension level offers vast surface area and pore volume availability for pore diffusion-sorption activities [50] that results in a higher adsorption capacity [18].…”

Section: Adsorption Equilibriummentioning

confidence: 99%

“…The pseudo-second-order kinetic equation for adsorption is much similar to the universal rate law for chemical reaction [47]. Since the processes followed the pseudo second-order equation, it literally suggests that the adsorption is mainly by simple chemisorption reaction occurring between the lead ions and the surface functional groups of CDs [49,50].…”

Section: Pseudo First and Second-order Kinetic Modelsmentioning

confidence: 99%

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Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

et al. 2020

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The materials and substances required for sustainable water treatment by adsorption technique, are still being researched widely by distinguished classes of researchers. Thus, the need to synthesize substances that can effectively clean up pollutants from the environment cannot be overemphasized. So far, materials in bulk forms that are rich in carbon, such as biochar and varieties of activated carbon have been used for various adsorptive purposes. The use of bulk materials for such purposes are not efficient due to minimal surface areas available for adsorption. This study explores the adsorption task at nano dimension using carbon dots (CDs) from tapioca. The properties of carbon structure and its influence on the adsorptive efficacy of carbon nanoparticles were investigated by energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HrTEM), and atomic force microscopy (AFM). The results implied carbon present in CDs are good adsorbents for effective adsorption of heavy metal ions (lead) with removal efficiency of 80.6% in aqueous environment. The adsorption process as explored by both Langmuir and Freundlich isotherms have proven favorability of the adsorption process. Langmuir form two and three have correlation coefficients R2 at 0.9922 and 0.9912, respectively. The Freundlich isotherm confirms CDs as having defined surface heterogeneity and the exponential distribution of active sites. The adsorption of lead unto CDs obeyed the second order kinetic model with coefficient of determination, R2 of 0.9668 and 0.9996 at an initial lead concentration of 20 mg/L and 100 mg/L, respectively. The findings validated the efficiency of CDs derived from tapioca as an excellent material for further utilization in the environmental fields of wastewater pollution detection and clean up, bio-imaging, and chemical sensing applications.

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Section: Adsorption Isothermmentioning

confidence: 99%

Section: Adsorption Equilibriummentioning

confidence: 99%

Section: Pseudo First and Second-order Kinetic Modelsmentioning

confidence: 99%

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Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

et al. 2020

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“…Moreover, previous researches on dye adsorption were carried out explicitly in single dye systems and scanty study reports were available in binary dye systems. Our previous work reports in detail preparation and characterization of thiourea-modified poly(acrylonitrile- co -acrylic acid) (TMPAA) and its adsorption capacities towards MG and MB in a single dye system [20,21,22]. Generally, multiple components of dyes coexist in real industrial wastewater systems.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Adsorption of Cationic Dyes from Binary Solutions by Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Detailed Isotherm and Kinetic Studies

et al. 2019

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In this study, simultaneous adsorption of cationic dyes was investigated by using binary component solutions. Thiourea-modified poly(acrylonitrile-co-acrylic acid) (TMPAA) polymer was used as an adsorbent for uptake of cationic dyes (malachite green, MG and methylene blue, MB) from aqueous solution in a binary system. Adsorption tests revealed that TMPAA presented high adsorption of MG and MB at higher pH and higher dye concentrations. It suggested that there are strong electrostatic attractions between the surface functional groups of the adsorbent and cationic dyes. The equilibrium analyses explain that both extended Langmuir and extended models are suitable for the description of adsorption data in the binary system. An antagonistic effect was found, probably due to triangular (MG) and linear (MB) molecular structures that mutually hinder the adsorption of both dyes on TMPAA. Besides, the kinetic studies for sorption of MG and MB dyes onto adsorbent were better represented by a pseudo-second-order model, which demonstrates chemisorption between the polymeric TMPAA adsorbent and dye molecules. According to experimental findings, TMPAA is an attractive adsorbent for treatment of wastewater containing multiple cationic dyes.

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“…The same dye was then adsorbed onto acrylonitrile and acrylic acid copolymers and modified with thiourea, thus obtaining a 95% removal at pH 9 with a contact time of 60 min. In this case, the mechanism involved was attributed to the electrostatic interaction between the cationic dye and ionized carboxylic groups …”

Section: Polymer Supports For the Separation Of Hazardous Organic Polmentioning

confidence: 99%

Polymer supports for the removal and degradation of hazardous organic pollutants: an overview

Urbano

Bustamante

Palacio

et al. 2020

Polymer International

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Over the last decades, the presence of highly organic pollutants has increased and become an environmental problem that affects all forms of life. To solve or reduce this problem, multiple strategies have been proposed for the elimination and degradation of organic compounds in aqueous media. This review aims to revise and critically discuss the most recent advances in polymer supports to be used for the adsorption and degradation of organic pollutants. However, the greatest challenge with respect to this issue is the industrial scale‐up of bioremediation processes that allow the removal and degradation of compounds in a continuous and large‐scale manner. © 2019 Society of Chemical Industry

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Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)

Cited by 51 publications

References 58 publications

Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

Eco-Friendly Sustainable Fluorescent Carbon Dots for the Adsorption of Heavy Metal Ions in Aqueous Environment

Simultaneous Adsorption of Cationic Dyes from Binary Solutions by Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Detailed Isotherm and Kinetic Studies

Polymer supports for the removal and degradation of hazardous organic pollutants: an overview

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