Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

Heavy metals are toxic substances that pose a real danger to humans and organisms, even at low concentration. Therefore, there is an urgent need to remove heavy metals. Herein, the nanocellulose (NC) was synthesized by the hydrolysis of cellulose using sulfuric acid, and then functionalized using po...

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Autores principales:	Norah Salem Alsaiari, Khadijah Mohammedsaleh Katubi, Fatimah Mohammed Alzahrani, Abdelfattah Amari, Haitham Osman, Faouzi Ben Rebah, Mohamed A. Tahoon
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	adsorption cellulose polypyrrole nanomaterials Cr(VI) water treatment Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/dc844088df3444be89816d2e57a6257c
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spelling	oai:doaj.org-article:dc844088df3444be89816d2e57a6257c2021-11-11T18:44:03ZSynthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution10.3390/polym132136912073-4360https://doaj.org/article/dc844088df3444be89816d2e57a6257c2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3691https://doaj.org/toc/2073-4360Heavy metals are toxic substances that pose a real danger to humans and organisms, even at low concentration. Therefore, there is an urgent need to remove heavy metals. Herein, the nanocellulose (NC) was synthesized by the hydrolysis of cellulose using sulfuric acid, and then functionalized using polypyrrole (ppy) through a polymerization reaction to produce polypyrrole/nanocellulose (ppy/NC) nanocomposite. The synthesized nanocomposite was characterized using familiar techniques including XRD, FT-IR, SEM, TEM, and TGA. The obtained results showed a well-constructed nanocomposite with excellent thermal stability in the nano-sized scale. The adsorption experiments showed that the ppy/NC nanocomposite was able to adsorb hexavalent chromium (Cr(VI)). The optimum pH for the removal of the heavy metal was pH 2. The interfering ions showed minor effect on the adsorption of Cr(VI) resulted from the competition between ions for the adsorption sites. The adsorption kinetics were studied using pseudo 1st order and pseudo 2nd order models indicating that the pseudo second order model showed the best fit to the experimental data, signifying that the adsorption process is controlled by the chemisorption mechanism. Additionally, the nanocomposite showed a maximum adsorption capacity of 560 mg/g according to Langmuir isotherm. The study of the removal mechanism showed that Cr(VI) ions were removed via the reduction of high toxic Cr(VI) to lower toxic Cr(III) and the electrostatic attraction between protonated ppy and Cr(VI). Interestingly, the ppy/NC nanocomposite was reused for Cr(VI) uptake up to six cycles showing excellent regeneration results. Subsequently, Cr(VI) ions can be effectively removed from aqueous solution using the synthesized nanocomposite as reusable and cost-effective adsorbent.Norah Salem AlsaiariKhadijah Mohammedsaleh KatubiFatimah Mohammed AlzahraniAbdelfattah AmariHaitham OsmanFaouzi Ben RebahMohamed A. TahoonMDPI AGarticleadsorptioncellulosepolypyrrolenanomaterialsCr(VI)water treatmentOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3691, p 3691 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption cellulose polypyrrole nanomaterials Cr(VI) water treatment Organic chemistry QD241-441
spellingShingle	adsorption cellulose polypyrrole nanomaterials Cr(VI) water treatment Organic chemistry QD241-441 Norah Salem Alsaiari Khadijah Mohammedsaleh Katubi Fatimah Mohammed Alzahrani Abdelfattah Amari Haitham Osman Faouzi Ben Rebah Mohamed A. Tahoon Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
description	Heavy metals are toxic substances that pose a real danger to humans and organisms, even at low concentration. Therefore, there is an urgent need to remove heavy metals. Herein, the nanocellulose (NC) was synthesized by the hydrolysis of cellulose using sulfuric acid, and then functionalized using polypyrrole (ppy) through a polymerization reaction to produce polypyrrole/nanocellulose (ppy/NC) nanocomposite. The synthesized nanocomposite was characterized using familiar techniques including XRD, FT-IR, SEM, TEM, and TGA. The obtained results showed a well-constructed nanocomposite with excellent thermal stability in the nano-sized scale. The adsorption experiments showed that the ppy/NC nanocomposite was able to adsorb hexavalent chromium (Cr(VI)). The optimum pH for the removal of the heavy metal was pH 2. The interfering ions showed minor effect on the adsorption of Cr(VI) resulted from the competition between ions for the adsorption sites. The adsorption kinetics were studied using pseudo 1st order and pseudo 2nd order models indicating that the pseudo second order model showed the best fit to the experimental data, signifying that the adsorption process is controlled by the chemisorption mechanism. Additionally, the nanocomposite showed a maximum adsorption capacity of 560 mg/g according to Langmuir isotherm. The study of the removal mechanism showed that Cr(VI) ions were removed via the reduction of high toxic Cr(VI) to lower toxic Cr(III) and the electrostatic attraction between protonated ppy and Cr(VI). Interestingly, the ppy/NC nanocomposite was reused for Cr(VI) uptake up to six cycles showing excellent regeneration results. Subsequently, Cr(VI) ions can be effectively removed from aqueous solution using the synthesized nanocomposite as reusable and cost-effective adsorbent.
format	article
author	Norah Salem Alsaiari Khadijah Mohammedsaleh Katubi Fatimah Mohammed Alzahrani Abdelfattah Amari Haitham Osman Faouzi Ben Rebah Mohamed A. Tahoon
author_facet	Norah Salem Alsaiari Khadijah Mohammedsaleh Katubi Fatimah Mohammed Alzahrani Abdelfattah Amari Haitham Osman Faouzi Ben Rebah Mohamed A. Tahoon
author_sort	Norah Salem Alsaiari
title	Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
title_short	Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
title_full	Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
title_fullStr	Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
title_full_unstemmed	Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution
title_sort	synthesis, characterization and application of polypyrrole functionalized nanocellulose for the removal of cr(vi) from aqueous solution
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/dc844088df3444be89816d2e57a6257c
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Synthesis, Characterization and Application of Polypyrrole Functionalized Nanocellulose for the Removal of Cr(VI) from Aqueous Solution

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