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Algethami JS, Jugade R, Billah El Kaim R, Bahsis L, Achak M, Majdoubi H, Shekhawat A, Korde S, López-Maldonado EA. Chitin extraction from crab shells and synthesis of chitin @metakaolin composite for efficient amputation of Cr (VI) ions. ENVIRONMENTAL RESEARCH 2024; 252:119065. [PMID: 38723990 DOI: 10.1016/j.envres.2024.119065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/29/2024] [Accepted: 05/01/2024] [Indexed: 05/15/2024]
Abstract
The present research study combines chitin from shrimp waste with the oxide-rich metakaolin. Metakaolin is a blend of mixed oxides rich in silica and alumina with good adsorbent properties. The chitin@metakaolin (CHt@M.K.) composite was synthesized and characterized using FTIR, SEM, TGA, XRD and XPS techniques. Cr(VI) removal studies were compared for chitin and CHt@M.K. through adsorption. It was found that the adsorption capacity of CHt@M.K. is 278.88 mg/g, almost double that of chitin, at pH 5.0 in just 120 min of adsorption. Isotherm models like Langmuir, Freundlich, Temkin and Dubinin-Radushkevich were investigated to comprehend the adsorption process. It was revealed that Langmuir adsorption isotherm is most suitable to elucidate Cr(VI) adsorption on CHt@M.K. The adsorption kinetics indicate that pseudo first order was followed, indicating that the physisorption was the process that limited the sorption process rate. The positive enthalpy change (20.23 kJ/mol) and positive entropy change (0.083 kJ/mol K) showed that the adsorption process was endothermic and more random at the solid-liquid interface. The negative free energy change over entire temperature range was an indicator of spontaneity of the process. Apart from all these, the non-covalent interactions between Cr(VI) and composite were explained by quantum calculations based models.
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Affiliation(s)
- Jari S Algethami
- Department of Chemistry, College of Science and Arts, Najran University, P.O. Box, 1988, Najran, 11001, Saudi Arabia; Advanced Materials and Nano-Research Centre (AMNRC), Najran University, Najran, 11001, Saudi Arabia
| | - Ravin Jugade
- Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India.
| | - Rachid Billah El Kaim
- National School of Applied Sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299, 24000, El Jadida, Morocco.
| | - Lahoucine Bahsis
- Laboratoire de Chimie Analytique Et Moléculaire, Faculté Poly-Disciplinaire, Morocco
| | - Mounia Achak
- National School of Applied Sciences, Chouaib Doukkali University, Avenue Jabran Khalil Jabran B.P 299, 24000, El Jadida, Morocco; Chemical & Biochemical Sciences, Green Process Engineering, CBS, Mohammed VI Polytechnic University, Ben Guerir, Morocco
| | - Hicham Majdoubi
- Materials Science Energy and Nanoengineering Department, Mohammed VI Polytechnic University, Benguerir, Morocco
| | - Anita Shekhawat
- Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India
| | - Sanjiwani Korde
- Department of Chemistry, R.T.M. Nagpur University, Nagpur, 440033, India
| | - Eduardo Alberto López-Maldonado
- Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, 22424, Tijuana, Baja California, Mexico
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Shinu KP, John H, Gopalakrishnan J. Chitin/deacetylated chitin nanocomposite film for effective adsorption of organic pollutant from aqueous solution. Int J Biol Macromol 2023:125038. [PMID: 37245754 DOI: 10.1016/j.ijbiomac.2023.125038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 05/13/2023] [Accepted: 05/21/2023] [Indexed: 05/30/2023]
Abstract
Cross-linked chitin/deacetylated chitin nanocomposite films can be considered as a potential industrial adsorbent for the removal of organic pollutants for water purification. Chitin (C) and deacetylated chitin (dC) nanofibers were extracted from raw chitin and characterized using FTIR, XRD and TGA techniques. The TEM image confirmed the formation of chitin nanofibers with a diameter range of 10-45 nm. The deacetylated chitin nanofibers (DDA-46 %) having 30 nm diameter was evidenced using FESEM. Further, the C/dC nanofibers were prepared at different ratios (80/20, 70/30, 60/40 & 50/50 ratios) and cross-linked. The highest tensile strength of 40 MPa and Young's modulus of 3872 MPa was exhibited by 50/50C/dC. The DMA studies revealed that the storage modulus enhanced by 86 % for 50/50C/dC (9.06 GPa) in comparison to 80/20C/dC nanocomposite. Further, the 50/50C/dC exhibited a maximum adsorption capacity of 30.8 mg/g at pH = 4 in 30 mg/L of Methyl Orange (MO) dye within 120 min. The experimental data agreed with pseudo-second-order model indicating chemisorption process. The adsorption isotherm data was best described by Freundlich model. The nanocomposite film is an effective adsorbent can be regenerated and recycled for five adsorption-desorption cycle.
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Affiliation(s)
| | - Honey John
- Dept. of Polymer Science and Rubber Technology, CUSAT, Kochi 22, India; Interuniversity Centre for Nanomaterials and Devices, CUSAT, Kochi 22, India
| | - Jayalatha Gopalakrishnan
- Dept. of Polymer Science and Rubber Technology, CUSAT, Kochi 22, India; Interuniversity Centre for Nanomaterials and Devices, CUSAT, Kochi 22, India.
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