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Periyasamy S, Viswanathan N. Hydrothermally magnetic particles fabricated hydrocalumite based biopolymeric composites for toxic chromium removal. Environ Sci Pollut Res Int 2023; 30:88072-88083. [PMID: 37438510 DOI: 10.1007/s11356-023-28304-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 06/13/2023] [Indexed: 07/14/2023]
Abstract
Hexavalent chromium is an emerging environmental pollutant that leads to various effects on living organisms. The developed clay material, hydrocalumite (HC) possesses promising chromium adsorption capacity but because of its powder form it cannot be used in column studies. Hence, it is aimed to prepared HC in an usable hybrid bio-composite form by dispersing HC in biopolymeric matrixes like chitosan (CS) and cellulose (Cel) as HCCS and HCCel bio-composites for Cr(VI) removal from water. For quick separation after adsorption, the magnetic particles sprayed HCCS (Fe3O4@HCCS) and HCCel (Fe3O4@HCCel) bio-composites were prepared which possess high adsorption capacity. Different instrumental techniques like FTIR, SEM, and EDAX studies were used to examine the synthesized magnetic bio-composites in order to determine their physicochemical properties. The promising adsorbents namely Fe3O4@HCCS and Fe3O4@HCCel bio-composites were examined for Cr(VI) removal in batch mode. The maximum chromium adsorption capacity of Fe3O4@HCCS and Fe3O4@HCCel bio-composites were found at 43.4 mg/L and 31.8 mg/L, respectively within 45 min. The Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) isotherms were used to reinterpret the equilibrium data of the synthetic magnetic bio-composites. According to the thermodynamic findings, chromium adsorption onto magnetic bio-composites is an endothermic and spontaneous reaction. The NaOH solution makes it simple to regenerate the chromium adsorbed magnetic bio-composites, which can be successfully employed upto four times. The synthesized Fe3O4@HCCS and Fe3O4@HCCel bio-composites act as efficient adsorbents for chromium removal.
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Affiliation(s)
- Soodamany Periyasamy
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India.
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Jeyaseelan A, Viswanathan N, Kumar IA, Naushad M. Design of hydrotalcite and biopolymers entrapped tunable cerium organic cubic hybrid material for superior fluoride adsorption. Colloids Surf B Biointerfaces 2023; 224:113190. [PMID: 36764205 DOI: 10.1016/j.colsurfb.2023.113190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/25/2023] [Accepted: 01/31/2023] [Indexed: 02/04/2023]
Abstract
The excess fluoride in drinking water is serious risk which leads to fluorosis. The adsorption method is facile route for defluoridation studies. Hybrid adsorbent possesses unique advantages like high surface area and high stability has been employed for water treatment. In the present work, hydrotalcite (HT) fabricated Ce-metal organic frameworks (MOFs) bridged with biopolymers (alginate and chitosan) namely HT-CeMOFs@Alg-CS cubic hybrid beads was developed and employed towards fluoride removal in batch mode. The fabricated HT-CeMOFs@Alg-CS beads were analyzed by DTA, FTIR, SEM, EDAX, TGA and XRD studies. Besides, FTIR and EDAX proved the affinity of HT-CeMOFs@Alg-CS cubic hybrid beads on fluoride was majorly attributed by electrostatic interaction, ion-exchange and complexation mechanism. To include detail insight into adsorption route; the kinetics, thermodynamic and isotherm studies were investigated for fluoride adsorption. The equilibrium data of HT-CeMOFs@Alg-CS cubic hybrid beads for fluoride adsorption was fitted with Langmuir isotherm model. Thermodynamic investigation results demonstrated that the fluoride adsorption was spontaneous with endothermic nature. The regeneration and field investigation results revealed that the developed HT-CeMOFs@Alg-CS cubic hybrid beads are reusable and more apt at field environment.
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Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India.
| | - Ilango Aswin Kumar
- Faculty of Civil Engineering, Department of Landscape and Water Conservation, Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic
| | - Mu Naushad
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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Patil TS, Viswanathan N, George R. To compare central visual field progression using mean deviation and pointwise linear regression analysis. Indian J Ophthalmol 2023; 71:854-860. [PMID: 36872693 DOI: 10.4103/ijo.ijo_1737_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023] Open
Abstract
Purpose To compare central visual field progression using mean deviation and pointwise linear regression (PLR) analysis. Methods We analyzed the 10-2 Humphrey visual field (HVF) tests for moderate and advanced primary glaucoma who had undergone at least five reliable 10-2 visual field tests with a minimum follow-up of at least two years and best-corrected visual acuity better than 6/12. Regression slope less than -1 dB/year at P < 0.01 at a point was defined as an individual threshold point progression. Results Ninety-six eyes of 74 patients were included. The median follow-up duration was of 4 years (±1.97). Median 10-2 mean deviation (MD) at inclusion was -19.01 dB (interquartile range [IQR] -13.2, -24.14) and -21.90 (IQR - 13.4, -27.8) on 24-2 HVF. The median rate of MD change was -0.13 dB/year (IQR - 0.46, 0.08) for 10-2. The median rate for visual field index (VFI) change was 0.9% per year (IQR - 1.5, 0.4). Twenty-eight percent of eyes (27 eyes) showed progression. Twelve percent (12 eyes) showed progression of two or more points in the same hemifield on pointwise linear regression (PLR) analysis, and 16% of eyes (15 eyes) showed progression of one point. The median rate of MD change was significantly more in progressing eyes based on PLR analysis than eyes with no progression (-0.5 vs. -0.06 dB/year P < 0.001). One patient had likely and the second had possible progression on 24-2. In 24 eyes, event analysis did not show any change; the rest mean deviation was out of range. Conclusion Central visual field PLR analysis is useful in detecting progression in advanced glaucomatous damage.
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Affiliation(s)
- Trupti S Patil
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Sankara Nethralaya Medical Research Foundation, Chennai, Tamil Nadu, India
| | - N Viswanathan
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Sankara Nethralaya Medical Research Foundation, Chennai, Tamil Nadu, India
| | - Ronnie George
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Sankara Nethralaya Medical Research Foundation, Chennai, Tamil Nadu, India
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Arokiaraj S, Viswanathan N. ECG-NETS – A novel integration of capsule networks and extreme gated recurrent neural network for IoT based human activity recognition. IFS 2023. [DOI: 10.3233/jifs-221551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Human Activity Recognition (HAR) has reached its new dimension with the support of Internet of Things (IoT) and Artificial Intelligence (AI). To observe human activities, motion sensors like accelerometer or gyroscope can be integrated with microcontrollers to collect all the inputs and send to the cloud with the help of IoT transceivers. These inputs give the characteristics such as, angular velocity of movements, acceleration and apply them for an effective HAR. But reaching high recognition rate with less complicated computational overhead still represents a problem in the research. To solve this aforementioned issue, this work proposes a novel ensembling of Capsule Networks (CN) and modified Gated Recurrent Units (MGRU) with Extreme Learning Machine (ELM) for an effective HAR classification based on data collected using IoT systems called Ensemble Capsule Gated (ECG)-Networks (NETS). The proposed system uses Capsule networks for spatio-feature extraction and modified (Gated Recurrent Unit) GRU for temporal feature extraction. The powerful feed forward training networks are then employed to train these features for human activity recognition. The proposed model is validated on real time IoT data and WISDM datasets. Experimental results demonstrates that proposed model achieves better results comparatively higher than existing (Deep Learning) DL models.
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Affiliation(s)
- S. Arokiaraj
- Department of Electronics and Communication Engineering, Tagore Institute of Engineering and Technology, Salem, Tamil Nadu, India
| | - N. Viswanathan
- Deparment of Electronics and Communication Engineering, Mahendra Engineering College (Autonomous) Namakkal, Tamil Nadu, India
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Jeyaseelan A, Aswin Kumar I, Viswanathan N, Naushad M. Development and characterization of hydroxyapatite layered lanthanum organic frameworks by template method for defluoridation of water. J Colloid Interface Sci 2022; 622:228-238. [DOI: 10.1016/j.jcis.2022.04.097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 04/12/2022] [Accepted: 04/17/2022] [Indexed: 01/15/2023]
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Jeyaseelan A, Viswanathan N. Investigation of Hydroxyapatite-Entrenched Cerium Organic Frameworks Incorporating Biopolymeric Beads for Efficient Fluoride Removal. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c00487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul, 624 622 Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul, 624 622 Tamilnadu, India
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Jeyaseelan A, Kumar IA, Viswanathan N, Naushad M. Rationally designed and hierarchically structured functionalized aluminium organic frameworks incorporated chitosan hybrid beads for defluoridation of water. Int J Biol Macromol 2022; 207:941-951. [PMID: 35339496 DOI: 10.1016/j.ijbiomac.2022.03.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 02/23/2022] [Accepted: 03/20/2022] [Indexed: 02/07/2023]
Abstract
In this present investigation, aluminium (Al3+) fabricated 2-aminobenzene-1,4-dicarboxylic acid (ABDC) namely Al@ABDC metal organic frameworks (MOFs) was developed for defluoridation studies. The unique advantages of developed MOFs possess high selectivity, high porosity and enhanced surface area but the developed powder form of Al@ABDC MOFs has several limitations in field applications like slow filtration and column blockage. To prevail over these troubles, biopolymer namely chitosan (CS) supported Al@ABDC MOFs namely Al@ABDC-CS beads were developed for effective fluoride adsorption from water. The synthesized Al@ABDC-CS beads were employed for the retention of fluoride in batch level. The defluoridation capacities (DCs) of Al@ABDC MOFs and Al@ABDC-CS beads were found to be 4880 and 4900 mgF- kg-1 respectively. The influencing parameters of adsorption method namely agitation time, adsorbent dosage, initial fluoride concentration, pH, co-existing anions and temperature were exploit to get utmost defluoridation capacity (DC) of Al@ABDC-CS beads. The experimental data of Al@ABDC-CS beads have been evaluated utilizing Langmuir, Fruendlich and Dubinin-Radushkevich (D-R) isotherms. The defluoridation nature of Al@ABDC-CS beads was determined by the thermodynamic parameters. The order of reaction of Al@ABDC-CS beads was studied using various kinetic models. The regeneration and field water studies of Al@ABDC-CS beads were also carried out to check their reusability and suitability at field conditions.
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Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul 624 622, Tamilnadu, India
| | - Ilango Aswin Kumar
- Faculty of Civil Engineering, Department of Landscape and Water Conservation, Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul 624 622, Tamilnadu, India.
| | - Mu Naushad
- Department of Chemistry, College of Science, Kind Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
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Kumar IA, Mezni A, Periyasamy S, Viswanathan N. Development of cerium-trimesic acid complexed 2D frameworks for effective nitrate and phosphate remediation. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jeyaseelan A, Aswin Kumar I, Naushad M, Viswanathan N. Defluoridation using hydroxyapatite implanted lanthanum organic framework-based bio-hybrid beads. REACT CHEM ENG 2022. [DOI: 10.1039/d2re00161f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present study reports on biopolymer based material namely HAp–La-BTC MOFs@Alg–CS hybrid beads were developed and it was potentially employed for fluoride removal.
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Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering – Dindigul, Reddiyarchatram, Dindigul – 624 622, Tamilnadu, India
| | - Ilango Aswin Kumar
- Faculty of Civil Engineering, Department of Landscape and Water Conservation, Czech Technical University in Prague, Thakurova 7, 166 29, Prague 6, Czech Republic
| | - Mu. Naushad
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh-11451, Saudi Arabia
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering – Dindigul, Reddiyarchatram, Dindigul – 624 622, Tamilnadu, India
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Aswin Kumar I, Jeyaseelan A, Viswanathan N, Naushad M, Valente AJ. Fabrication of lanthanum linked trimesic acid as porous metal organic frameworks for effective nitrate and phosphate adsorption. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122446] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Jeyaseelan A, Mezni A, Viswanathan N. Facile hydrothermal fabrication of functionalized multi‐layer graphene oxide encapsulated chitosan beads for enriched fluoride adsorption. J Appl Polym Sci 2021. [DOI: 10.1002/app.51703] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry Anna University, University College of Engineering, Dindigul Reddiyarchatram Dindigul Tamilnadu India
| | - Amine Mezni
- Department of Chemistry College of Science, Taif University Taif Saudi Arabia
| | - Natrayasamy Viswanathan
- Department of Chemistry Anna University, University College of Engineering, Dindigul Reddiyarchatram Dindigul Tamilnadu India
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Jeyaseelan A, Alsaiari NS, Katubi KMM, Naushad M, Viswanathan N. Design and synthesis of amine grafted graphene oxide encapsulated chitosan hybrid beads for defluoridation of water. Int J Biol Macromol 2021; 182:1843-1851. [PMID: 34029583 DOI: 10.1016/j.ijbiomac.2021.05.132] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 05/18/2021] [Accepted: 05/19/2021] [Indexed: 12/24/2022]
Abstract
The promising adsorbent like graphene oxide (GO), chitosan (CS) and amine functionalized graphene oxide (AGO) decorated chitosan (CS) namely AGO@CS composite beads was efficiently prepared for defluoridation studies. The prepared AGO@CS composite beads possess enriched defluoridation capacity (DC) of 4650 mgF- kg-1. Batch method was used to optimize the maximum DC of AGO@CS composite beads. The physicochemical properties of AGO@CS composite beads were explored by numerous instrumental techniques viz., FTIR, Raman, XPS, SEM and TGA investigation. The experimental values of AGO@CS composite beads for fluoride removal at various temperature conditions were assessed with adsorption isotherms, kinetic and thermodynamic studies. The possible defluoridation mechanism of AGO@CS beads was mostly proposed that electrostatic attraction. The reusability and field investigation results of AGO@CS beads shows they are regenerable and applicable at field circumstances.
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Affiliation(s)
- Antonysamy Jeyaseelan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul 624 622, Tamilnadu, India
| | - Norah Salem Alsaiari
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
| | | | - Mu Naushad
- Advanced Materials Research Chair, Department of Chemistry, College of Science, Kind Saud University, Riyadh 11451, Saudi Arabia; Yonsei Frontier Lab, Yonsei University, Seoul, Republic of Korea
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul 624 622, Tamilnadu, India.
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Kumar IA, Naushad M, Ahamad T, Viswanathan N. Superficial development of Lewis zirconium ion cross-linked gelatin/kaolin hybrid composite for nutrients remediation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114982] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Aswin Kumar I, Viswanathan N. Hydrothermal Fabrication of Amine-Grafted Magnetic Gelatin Hybrid Composite for Effective Adsorption of Nitrate and Phosphate. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04815] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ilango Aswin Kumar
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India
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Kumar IA, Viswanathan N. Micro-encapsulation and hydrothermal tuning of amine decorated magnetic alginate hybrid beads for nitrate and phosphate remediation. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.06.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Pandi K, Viswanathan N, Meenakshi S. Hydrothermal synthesis of magnetic iron oxide encrusted hydrocalumite-chitosan composite for defluoridation studies. Int J Biol Macromol 2019; 132:600-605. [DOI: 10.1016/j.ijbiomac.2019.03.115] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 02/14/2019] [Accepted: 03/18/2019] [Indexed: 11/30/2022]
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Periyasamy S, Manivasakan P, Jeyaprabha C, Meenakshi S, Viswanathan N. Fabrication of nano-graphene oxide assisted hydrotalcite/chitosan biocomposite: An efficient adsorbent for chromium removal from water. Int J Biol Macromol 2019; 132:1068-1078. [DOI: 10.1016/j.ijbiomac.2019.03.232] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/19/2019] [Accepted: 03/29/2019] [Indexed: 01/12/2023]
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Kumar IA, Jeyaprabha C, Meenakshi S, Viswanathan N. Hydrothermal encapsulation of lanthanum oxide derived Aegle marmelos admixed chitosan bead system for nitrate and phosphate retention. Int J Biol Macromol 2019; 130:527-535. [DOI: 10.1016/j.ijbiomac.2019.02.106] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 02/10/2019] [Accepted: 02/18/2019] [Indexed: 11/17/2022]
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Viswanathan N, Kumar IA, Meenakshi S. Development of chitosan encapsulated tricalcium phosphate biocomposite for fluoride retention. Int J Biol Macromol 2019; 133:811-816. [PMID: 30986457 DOI: 10.1016/j.ijbiomac.2019.04.076] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 03/26/2019] [Accepted: 04/11/2019] [Indexed: 10/27/2022]
Abstract
The powder form of tricalcium phosphate (TCP) causes the significant pressure drop which limit its application under field conditions. To trounce such technological troubles and to enhance the defluoridation capacity (DC) of TCP, chitosan (CS) encapsulated TCP polymeric composite was prepared by dispersing TCP particles into chitosan polymeric matrix to produce tricalcium phosphate/chitosan (TCPCS) composite which could be made into any desirable form. The synthesized TCPCS composite possesses an enhanced DC of 1034 mgF-/kg than the individual components viz., TCP and chitosan which has got DC of 490 and 52 mgF-/kg respectively. The prepared adsorbents were characterized by FTIR, SEM and EDAX analysis. The various physico-chemical properties such as contact time, solution pH, co-anions and temperature were optimized to get maximum defluoridation. The equilibrium and kinetic experiments were conducted for TCPCS composite toward fluoride removal. The practical applicability of TCPCS composite was examined at field conditions.
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Affiliation(s)
- Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul - 624 622, Tamilnadu, India.
| | - Ilango Aswin Kumar
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Dindigul - 624 622, Tamilnadu, India
| | - Sankaran Meenakshi
- Department of Chemistry, Gandhigram Rural Institute - Deemed to be University, Gandhigram - 624 302, Tamilnadu, India
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Kumar IA, Viswanathan N. Hydrothermal Fabrication of Zirconium Oxyhydroxide Capped Chitosan/Kaolin Framework for Highly Selective Nitrate and Phosphate Retention. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b01859] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ilango Aswin Kumar
- Department of Chemistry, Anna University, University College
of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College
of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India
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Kumar IA, Viswanathan N. Preparation and testing of a tetra-amine copper(II) chitosan bead system for enhanced phosphate remediation. Carbohydr Polym 2018; 183:173-182. [DOI: 10.1016/j.carbpol.2017.11.087] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 11/11/2017] [Accepted: 11/24/2017] [Indexed: 11/15/2022]
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Periyasamy S, Viswanathan N. Hydrothermal synthesis of hydrocalumite assisted biopolymeric hybrid composites for efficient Cr(vi) removal from water. NEW J CHEM 2018. [DOI: 10.1039/c7nj04524g] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Hydrocalumite (HC) incorporated biopolymer (alginate and chitosan) based hybrid composite materials were developed for the selective removal of chromium.
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Affiliation(s)
- Soodamani Periyasamy
- Department of Chemistry
- Anna University
- University College of Engineering
- Dindigul
- India
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Kumar IA, Viswanathan N. Development of multivalent metal ions imprinted chitosan biocomposites for phosphate sorption. Int J Biol Macromol 2017; 104:1539-1547. [DOI: 10.1016/j.ijbiomac.2017.02.100] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/12/2017] [Accepted: 02/27/2017] [Indexed: 01/15/2023]
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Periyasamy S, Gopalakannan V, Viswanathan N. Fabrication of magnetic particles imprinted cellulose based biocomposites for chromium(VI) removal. Carbohydr Polym 2017; 174:352-359. [DOI: 10.1016/j.carbpol.2017.06.029] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/28/2017] [Accepted: 06/07/2017] [Indexed: 10/19/2022]
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26
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Benil P, Lekshmi R, Viswanathan N, Jollykutty E, Rajakrishnan R, Thomas J, Alfarhan A. Combined efficacy of Vigna radiata (L.) R. Wilczek and Amorphophallus paeoniifolius (Dennst.) Nicolson on serum lipids in albino rats. Saudi J Biol Sci 2017; 24:1249-1254. [PMID: 28855818 PMCID: PMC5562459 DOI: 10.1016/j.sjbs.2017.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/27/2017] [Accepted: 03/05/2017] [Indexed: 11/16/2022] Open
Abstract
Coronary Artery Disease (CAD) is a major killer disease throughout the world. Dyslipidemia is a major contributor to the risk of CAD. Several dietary articles traditionally used in India and other South Asian countries reduced dyslipidemia. The present study was undertaken to evaluate the combined effect of Mung bean (Vigna radiata) and Elephant foot yam (Amorphophallus paeoniifolius) on serum lipids and atherogenic indices in albino rats and to compare it with a standard drug Cholestyramine. Thirty healthy albino rats of both sexes (150-200 g) were randomized to 5 groups of 6 animals each. The grouping were done based on the following criteria: Group I: Normal Control Group, Group II: (Standard Group): Cholestyramine resin 5 mg/kg bw, Group III: (Half Dose Group): Drug powder at 540 mg/kg bw, Group IV: (Effective Dose Group): Drug powder at 1080 mg/kg bw, and Group V: (Double Dose Group): Drug powder at 2160 mg/kg bw. Lipid profile was estimated at the beginning and after 30 days of treatment. The Effective and Double doses of the drug reduced Total cholesterol along with levels of Triglycerides, Low density lipoprotein and Very low density lipoprotein levels significantly (p < 0.01) along with a significant (p < 0.01) increase in high density lipoproteins (HDL) in rats. There was also significant (p < 0.01) improvement in atherogenic indices like Castelli Risk Index I, Non HDL C/HDL, Castelli risk Index II, TG/HDL, Atherogenic coefficient and Atherogenic Index of Plasma. The combination of powdered sprouted mung bean and yam powder have excellent lipid lowering potential.
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Affiliation(s)
- P.B. Benil
- Dept. of Agadatantra, Vaidyaratnam P.S Varier Ayurveda College, Edarikode P.O, Kottakkal, Kerala, India
| | - R. Lekshmi
- Dept. of Botany and Biotechnology, MSM College, Kayamkulam, Kerala, India
| | - N. Viswanathan
- Dept. of Dravyagunavijnan, Govt. Ayurveda College, Thiruvananthapuram, Kerala, India
| | - E. Jollykutty
- Dept. of Dravyagunavijnan, Govt. Ayurveda College, Thiruvananthapuram, Kerala, India
| | - R. Rajakrishnan
- Dept. of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia
| | - J. Thomas
- Dept. of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia
| | - A.H. Alfarhan
- Dept. of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia
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Gopalakannan V, Periyasamy S, Viswanathan N. Synthesis of assorted metal ions anchored alginate bentonite biocomposites for Cr(VI) sorption. Carbohydr Polym 2016; 151:1100-1109. [DOI: 10.1016/j.carbpol.2016.06.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 06/01/2016] [Accepted: 06/06/2016] [Indexed: 10/21/2022]
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Abstract
We present a sparse synthetic-aperture, active imaging system at W-band (75 - 110 GHz), which uses sub-harmonic mixer modules. The system employs mechanical scanning of the receiver module position, and a fixed transmitter module. A vector network analyzer provides the back end detection. A full-wave forward model allows accurate construction of the image transfer matrix. We solve the inverse problem to reconstruct scenes using the least squares technique. We demonstrate far-field, diffraction limited imaging of 2D and 3D objects and achieve a cross-range resolution of 3 mm and a depth-range resolution of 4 mm, respectively. Furthermore, we develop an information-based metric to evaluate the performance of a given image transfer matrix for noise-limited, computational imaging systems. We use this metric to find the optimal gain of the radiating element for a given range, both theoretically and experimentally in our system.
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29
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Gopalakannan V, Viswanathan N. One pot synthesis of metal ion anchored alginate–gelatin binary biocomposite for efficient Cr(VI) removal. Int J Biol Macromol 2016; 83:450-9. [DOI: 10.1016/j.ijbiomac.2015.10.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 10/01/2015] [Accepted: 10/05/2015] [Indexed: 11/26/2022]
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30
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Pandi K, Viswanathan N. A facile synthesis of metal ion-imprinted graphene oxide/alginate hybrid biopolymeric beads for enhanced fluoride sorption. RSC Adv 2016. [DOI: 10.1039/c6ra11713a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The defluoridation mechanism of GOAlgLa composite beads was governed by ion-exchange, adsorption and complexation. In field water, GOAlgLa composite beads reduce fluoride levels below the tolerance limit.
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Affiliation(s)
- Kalimuthu Pandi
- Department of Chemistry
- Anna University
- University College of Engineering – Dindigul
- Dindigul – 624 622
- India
| | - Natrayasamy Viswanathan
- Department of Chemistry
- Anna University
- University College of Engineering – Dindigul
- Dindigul – 624 622
- India
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Affiliation(s)
- Venkatrajan Gopalakannan
- Department
of Chemistry, Velammal College of Engineering and Technology, Madurai-625 009, Tamilnadu, India
| | - Natrayasamy Viswanathan
- Department of
Chemistry, Anna University, University College of Engineering-Dindigul, Dindigul-624 622, Tamilnadu, India
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32
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Anto Prabhu R, Kannan K, Victor A, Selvan T, Kumar S, Arvind A, Arun A, Viswanathan N, Rudrappa, Majella. Myocardial infarction in young adults: A smoldering epidemic – A study from south India. Indian Heart J 2015. [DOI: 10.1016/j.ihj.2015.10.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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33
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Pandi K, Viswanathan N. Synthesis and applications of eco-magnetic nano-hydroxyapatite chitosan composite for enhanced fluoride sorption. Carbohydr Polym 2015; 134:732-9. [DOI: 10.1016/j.carbpol.2015.08.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/20/2015] [Accepted: 08/04/2015] [Indexed: 10/23/2022]
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34
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Kumaran RM, Kannan K, Victor A, Tamilselvan K, Majella JCM, Arun R, Arvind A, Viswanathan N, Kumar RS, Rudrappa. A hitherto study of relationship between left atrial volume and pressure in echocardiogram and length of left atrial branch of left circumflex artery in rheumatic heart disease. Indian Heart J 2015. [DOI: 10.1016/j.ihj.2015.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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35
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Fernandes MS, Girisha BS, Viswanathan N, Sripathi H, Noronha TM. Discoid lupus erythematosus with squamous cell carcinoma: a case report and review of the literature in Indian patients. Lupus 2015; 24:1562-6. [PMID: 26251401 DOI: 10.1177/0961203315599245] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Accepted: 07/13/2015] [Indexed: 12/30/2022]
Abstract
We report a case of a patient with localized discoid lupus erythematosus (DLE) who was found to have high-grade squamous dysplasia (carcinoma in situ) over the upper lip. This report also consists of a brief review of 16 other cases of DLE with squamous cell carcinoma (SCC) we came across while going through the literature in an Indian scenario.Incidence of SCC over DLE in the Indian population is found to be 0.98% to 3.4% with a male-to-female ratio of 1.6:1. The latent period between onset of DLE and development of SCC was 9.59 ± 5.6 years.There was history of chronic sun exposure in 81.8% of patients, which indicates a possible role of prolonged ultraviolet light exposure in malignant transformation. The lips were the most commonly affected area (28.57%), with the upper lip being more commonly involved than the lower lip. We also observed that the latent period (5 ± 2.7 years) in lip tumours was shorter than that in other sites (11.22 ± 6.78 years), indicating a more rapid transformation in lips (p value = 0.038). Well differentiated was the most common (46.2%) type of SCC noted. Lymph node involvement was found in three of 17 cases (25%) and one case (8.3%) had recurrence of lesions after excision.We conclude that in India though SCC is rare per se, its occurrence in the context of DLE is not uncommon and is aggressive in nature.
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Affiliation(s)
- M S Fernandes
- Department of Dermatology, Venereology and Leprosy, K S Hegde Medical Academy, Deralakatte, India
| | - B S Girisha
- Department of Dermatology, Venereology and Leprosy, K S Hegde Medical Academy, Deralakatte, India
| | - N Viswanathan
- Department of Dermatology, Venereology and Leprosy, K S Hegde Medical Academy, Deralakatte, India
| | - H Sripathi
- Department of Dermatology, Venereology and Leprosy, K S Hegde Medical Academy, Deralakatte, India
| | - T M Noronha
- Department of Dermatology, Venereology and Leprosy, K S Hegde Medical Academy, Deralakatte, India
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36
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Pandi K, Viswanathan N. Enhanced defluoridation and facile separation of magnetic nano-hydroxyapatite/alginate composite. Int J Biol Macromol 2015; 80:341-9. [PMID: 26092170 DOI: 10.1016/j.ijbiomac.2015.06.019] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 06/03/2015] [Accepted: 06/11/2015] [Indexed: 11/30/2022]
Abstract
In this research study, a new magnetic biosorbent was developed by the fabrication of magnetic Fe3O4 particles on nano-hydroxyapatite(n-HAp)/alginate (Alg) composite (Fe3O4@n-HApAlg composite) for defluoridation in batch mode. The synthesized Fe3O4@n-HApAlg biocomposite possess an enhanced defluoridation capacity (DC) of 4050 mgF(-)/kg when compare to n-HApAlg composite, Fe3O4@n-HAp composite, n-HAp and Fe3O4 which possesses the DCs of 3870, 2469, 1296 and 1050 mgF(-)/kg respectively. The structural changes of the sorbent, before and after fluoride sorption were studied using FTIR, XRD and SEM with EDAX techniques. There are various physico-chemical parameters such as contact time, pH, co-existing anions, initial fluoride concentration and temperature were optimized for maximum fluoride removal. The equilibrium data was well modeled by Freundlich, Langmuir, Dubinin-Radushkevich (D-R) and Temkin isotherms. The present system follows Dubinin-Radushkevich isotherm model. The thermodynamic parameters reveals that the feasibility, spontaneity and endothermic nature of fluoride sorption. The performance and efficiency of the adsorbent material was examined with water samples collected from fluoride endemic areas namely Reddiyarchatram and Ammapatti in Dindigul District of Tamil Nadu using standard protocols.
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Affiliation(s)
- Kalimuthu Pandi
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul-624622, Tamil Nadu, India
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul-624622, Tamil Nadu, India.
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37
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Pandi K, Viswanathan N. In situ precipitation of nano-hydroxyapatite in gelatin polymatrix towards specific fluoride sorption. Int J Biol Macromol 2015; 74:351-9. [DOI: 10.1016/j.ijbiomac.2014.12.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 11/27/2014] [Accepted: 12/09/2014] [Indexed: 10/24/2022]
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38
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Affiliation(s)
- Kalimuthu Pandi
- Department of Chemistry; Anna University, University College of Engineering-Dindigul; Dindigul-624 622 Tamil Nadu India
| | - Natrayasamy Viswanathan
- Department of Chemistry; Anna University, University College of Engineering-Dindigul; Dindigul-624 622 Tamil Nadu India
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39
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Pandi K, Viswanathan N. Synthesis of alginate bioencapsulated nano-hydroxyapatite composite for selective fluoride sorption. Carbohydr Polym 2014; 112:662-7. [DOI: 10.1016/j.carbpol.2014.06.029] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Revised: 05/25/2014] [Accepted: 06/11/2014] [Indexed: 11/25/2022]
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40
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Viswanathan N, Pandi K, Meenakshi S. Synthesis of metal ion entrapped silica gel/chitosan biocomposite for defluoridation studies. Int J Biol Macromol 2014; 70:347-53. [DOI: 10.1016/j.ijbiomac.2014.06.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 05/24/2014] [Accepted: 06/05/2014] [Indexed: 10/25/2022]
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41
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42
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Parton HB, Greene R, Flatley AM, Viswanathan N, Wilensky L, Berman J, Schneider AE, Uribe A, Olson EC, Waddell EN, Thorpe LE. Health of Older Adults in New York City Public Housing: Part 2, Findings from the New York City Housing Authority Senior Survey. Care Manag J 2013; 13:213-26. [PMID: 23383587 DOI: 10.1891/1521-0987.13.4.213] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- H B Parton
- New York City Housing Authority, Resident Support Service, New York, NY 10007, USA
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43
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Parton HB, Greene R, Flatley AM, Viswanathan N, Wilensky L, Berman J, Schneider AE, Uribe A, Olson EC, Waddell EN, Thorpe LE. Health of older adults in New York City public housing: part 1, findings from the New York City Housing Authority Senior Survey. ACTA ACUST UNITED AC 2012; 13:134-47. [PMID: 23072177 DOI: 10.1891/1521-0987.13.3.134] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- H B Parton
- New York City Housing Authority, Resident Support Services, New York, NY 10007, USA
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Abstract
136 children below the age of 15 suffering from chronic tonsillitis were screened. 56 patients who showed a raised ASO titre above 200iu/ml were selected for this study. All of them underwent tonsillectomy. ASO titre estimation was done after 1 month;62% after 3 months;78% after 6 months and 88% after 1 year.
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45
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Zehtabchi S, Berwald N, Hassan K, Khan F, Viswanathan N, Ardolic B. 128 The Role of Antibiotic Prophylaxis for Prevention of Wound Infection in Emergency Department Patients With Simple Hand Laceration: A Feasibility Pilot Study. Ann Emerg Med 2012. [DOI: 10.1016/j.annemergmed.2012.06.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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46
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Rajiv Gandhi M, Viswanathan N, Meenakshi S. Synthesis and Characterization of a Few Amino-Functionalized Copolymeric Resins and Their Environmental Applications. Ind Eng Chem Res 2012. [DOI: 10.1021/ie3000503] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
| | - Natrayasamy Viswanathan
- Department of Chemistry, Anna University of Technology Madurai, Dindigul Campus,
Dindigul-624 622, Tamilnadu, India
| | - Sankaran Meenakshi
- Department of Chemistry, Gandhigram Rural University, Gandhigram-624 302, Tamilnadu,
India
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47
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Rajiv Gandhi M, Kousalya G, Viswanathan N, Meenakshi S. Sorption behaviour of copper on chemically modified chitosan beads from aqueous solution. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2010.08.079] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Kousalya G, Gandhi MR, Viswanathan N, Meenakshi S. Preparation and metal uptake studies of modified forms of chitin. Int J Biol Macromol 2010; 47:583-9. [DOI: 10.1016/j.ijbiomac.2010.07.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 07/29/2010] [Accepted: 07/30/2010] [Indexed: 11/30/2022]
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49
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Rajiv Gandhi M, Viswanathan N, Meenakshi S. Preparation and application of alumina/chitosan biocomposite. Int J Biol Macromol 2010; 47:146-54. [DOI: 10.1016/j.ijbiomac.2010.05.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Accepted: 05/05/2010] [Indexed: 10/19/2022]
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50
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Viswanathan N, Meenakshi S. Enriched fluoride sorption using alumina/chitosan composite. J Hazard Mater 2010; 178:226-32. [PMID: 20144851 DOI: 10.1016/j.jhazmat.2010.01.067] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2009] [Revised: 01/11/2010] [Accepted: 01/12/2010] [Indexed: 05/25/2023]
Abstract
Alumina possesses an appreciable defluoridation capacity (DC) of 1566 mg F(-)/kg. In order to improve its DC, it is aimed to prepare alumina polymeric composites using the chitosan. Alumina/chitosan (AlCs) composite was prepared by incorporating alumina particles in the chitosan polymeric matrix, which can be made into any desired form viz., beads, candles and membranes. AlCs composite displayed a maximum DC of 3809 mg F(-)/kg than the alumina and chitosan (52 mg F(-)/kg). The fluoride removal studies were carried out in batch mode to optimize the equilibrium parameters viz., contact time, pH, co-anions and temperature. The equilibrium data was fitted with Freundlich and Langmuir isotherms to find the best fit for the sorption process. The calculated values of thermodynamic parameters indicate the nature of sorption. The surface characterisation of the sorbent was performed by FTIR, AFM and SEM with EDAX analysis. A possible mechanism of fluoride sorption by AlCs composite has been proposed. Suitability of AlCs composite at field conditions was tested with a field sample taken from a nearby fluoride-endemic village. This work provides a potential platform for the development of defluoridation technology.
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Affiliation(s)
- Natrayasamy Viswanathan
- Department of Chemistry, Anna University Tiruchirappalli - Dindigul Campus, Dindigul 624 622, Tamil Nadu, India
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