Graphene Oxide-Magnetite Hybrid Nanoadsorbents For Toxin Removal in Aqueous System (Record no. 75619)

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005 - DATE AND TIME OF LATEST TRANSACTION
control field 20171128115613.0
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041 ## - LANGUAGE CODE
Language code of text/sound track or separate title eng
100 ## - MAIN ENTRY--AUTHOR NAME
Personal name Badhai, Pranati
Roll Number/Miscellaneous information 613CR3002
245 ## - TITLE STATEMENT
Title Graphene Oxide-Magnetite Hybrid Nanoadsorbents For Toxin Removal in Aqueous System
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Year of publication 2016
300 ## - PHYSICAL DESCRIPTION
Number of Pages 119 p.
502 ## - DISSERTATION NOTE
Degree Type Thesis M.Tech (R)
Name of granting institution National Institute of Technology, Rourkela
520 ## - SUMMARY, ETC.
Summary/Abstract, etc Rapid industrialization has led to massive environmental pollution, resulting in damage to the ecosystem and human health. Dyes and heavy metals are non-biodegradable toxins that possess carcinogenic and mutagenic properties. With the rising scarcity of water, these toxins need to be removed from water bodies economically and efficiently. Among all the classical wastewater treatment techniques, including complexation, chemical oxidation or reduction, solvent extraction, chemical precipitation, adsorption is the most promising separation method. However, it is a challenge to design adsorbent materials with high specific surface area and appropriate chemical functionality to selectively adsorb toxins.<br/>The present work demonstrates one of the new types of adsorbent materials, which is a hybrid of graphene oxide (GO) and magnetite. Nanostructured two dimensional sheets, such as GO, can act as anchor points where the ceramic magnetic oxide can be precipitated, thus reducing the latter’s agglomeration tendency and expose active sites effectively. A facile sonication assisted synthesis was adopted to prepare the hybrids, and tested for their toxin adsorption properties against three distinctly different materials. The adsorption characteristics of Cr(VI) (toxic heavy metal contaminant), malachite green (a toxic cationic dye), and phenol red (a neutral dye) on to the GO-Fe3O4 hybrids was systematically investigated. The hybrids exhibited better adsorption properties than that of bare Fe3O4 nanoparticles. In addition, the hybrids were proved to be an excellent material for the separation of malachite green, with efficiency as high as 97%, with faster kinetics. The removal efficiency of phenol red was moderate, owing to the lack of charge on the dye; upto 68% removal was observed due to the interaction of the zwitterions with the adsorbents.<br/>The presentation aims to discuss the effects of time, pH, and concentration on adsorption. The experimental results will be analyzed based on various kinetic models, including pseuo-first order, pseudo-second order, intraparticle diffusion, Bangham model. Equilibrium adsorption isotherms of these toxins on the GO-Fe3O4 hybrids will be discussed in the context of Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models.
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Engineering and Technology
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Ceramic Engnieering
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Nanocomposites
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term Nanotechnology
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name Behera, Shantanu Kumar
Relator term Supervisor
710 ## - ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Department of Ceramic Engineering
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier http://ethesis.nitrkl.ac.in/8049/
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type Thesis (Ph.D/M.Tech R)
Holdings
Withdrawn status Damaged status Collection code Permanent Location Current Location Shelving location Date acquired Accession Number Koha item type
    Reference BP Central Library BP Central Library Thesis Section 28/11/2017 T584 Thesis (Ph.D/M.Tech R)

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