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Title: Sustainable Green Nanotechnology for Filtration Fuctionalization of Cellulose for Decontamination of Arsenic
Researcher: Singh, Kiran
Guide(s): Srivastava, Shalini and Sinha, T. Jai Mangal
Keywords: Chemistry
Chemistry Multidisciplinary
Physical Sciences
University: Dayalbagh Educational Institute
Completed Date: 2017
Abstract: and#61510; newlineProblem Addressed Dangerous arsenic concentration in natural waters is now a worldwide crisis and often referred to as a 20th 21st century calamity. Considering the lethal impact of arsenic on human health, environmental authorities have taken a more stringent attitude towards the presence of arsenic in water and re-established a guideline of 0.01mg/L. Lots of wastewater treatment techniques are available having their own advantages and limitations. However, high operating costs, use of large amount of chemicals, technical constraints, tedious design and wastage of about 70-80 % water, necessitate research, towards identifying new reinforcement/ modifications to existing technologies providing cost-effective, eco-friendly, sustainable and environmentally sound methods using renewable resources. newlineand#61510; newlineSynthesis of Need based tailored Green Bio nanosorbents The current work exclusively pertains the preparation of arsenic removing economic biosorbent, starting from wood pulp, as an economic, largely abundant bio polymer resource for the extraction of microcrystalline cellulose (MCC) by chemi-mechanical process. Nanocrystalline cellulose (NCC) was isolated from MCC by using aqueous sulphuric acid hydrolysis. Single environmental friendly green route of functionalization of NCC have been applied in order to introduce cationic charge (amine and thiol groups) onto the surface of NCC including Grafting, Silylation and Cationization. newlineand#61510; newline Thorough newlineCharacterization The structural analysis was performed by GPC, TEM, XRD, AFM, SEM and FTIR studies. Strongly negative zeta potential value i.e. -37.68 mV was measured for NCC suggesting the high stability of NCC. newlineand#61510; newlineOptimization of conditions Batch experimental conditions were standardized to get optimum conditions as follows: sorbent dosage (0.5 g), concentration (25 mg/L), contact time (40 min), volume (250 ml) and pH 7.5 for As (III) and 2.5 for As (V) for removal of arsenite and arsenate. newlineand#61510; newlineAdsorption Efficiency Among the various biosorbents synthesized in the present work, CYS-g-DA-NCC (Cysteine-grafted-Dialdehyde nanocrystalline cellulose) was found to be the best biosorbent having maximum adsorption efficacy (98.92 and 94.62 %) and capacity (12.365 and 11.825 mg/g) for As III and V respectively. newlineand#61510; newlineMechanistic aspects of Adsorption Adsorption phenomenon of arsenic ions was confirmed by observed reduction in pore area (70-80 %) and reduction in specific surface area (75-80 %) of biosorbents as studied by SEM and BET studies after arsenic ion adsorption. newlineand#61510; newlineEquilibrium Adsorption Modeling Arsenic (III and V) ions equilibrium adsorption modeling was well explained using Langmuir and Freundlich models. Kinetic study illustrated that adsorption of arsenic ions obeyed pseudo-second-order nature of the chemisorption phenomenon. newlineand#61510; newlineReusability and Environmental Stability Functionalized bio nanosorbents can be reused upto seven cycles and their sorption efficiency remained almost constant with higher sorption efficiency (80 %), demonstrating that the interactions between arsenic ions and the surface functionalities of bio nanosorbents are reversible. This increase in the reusability cycle is associated with their enhanced stability and was confirmed by the TGA analysis which showed significant difference in the onset and endset decomposition temperature of the bio nanosorbents. newlineand#61510; newlinePotential Challenge A low cost, eco-friendly filter aid for small scale and pre treatment step before the large chemical treatment of arsenic was developed particularly for rural and sub-urban areas of the country for its tuning to meet out the technical requirements. The practicability of this filter aid for arsenic removal efficiency was experienced in environmental sample of Yamuna River. newline newline
Appears in Departments:Department of Chemistry

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01_title.pdfAttached File389.51 kBAdobe PDFView/Open
02_certificate.pdf170.73 kBAdobe PDFView/Open
03_declaration.pdf134.97 kBAdobe PDFView/Open
04_abstract.pdf37.47 kBAdobe PDFView/Open
05 _acknowledgement.pdf60.04 kBAdobe PDFView/Open
06_contents.pdf107.23 kBAdobe PDFView/Open
07 _list_ of _tables.pdf99.92 kBAdobe PDFView/Open
08_list _of_ figures.pdf142.39 kBAdobe PDFView/Open
09_list _of_ abbreviations.pdf121.79 kBAdobe PDFView/Open
10_the predicament.pdf61.1 kBAdobe PDFView/Open
11_chapter 1.pdf1.37 MBAdobe PDFView/Open
12_chapter 2.pdf259.6 kBAdobe PDFView/Open
13_chapter 3.pdf28.97 kBAdobe PDFView/Open
14_chapter 4.pdf1.38 MBAdobe PDFView/Open
15_chapter 5.pdf6.99 MBAdobe PDFView/Open
16_highlights.pdf103.84 kBAdobe PDFView/Open
17_references.pdf455.06 kBAdobe PDFView/Open
80_recommendation.pdf585.54 kBAdobe PDFView/Open

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