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<strong>Kinetic and thermodynamic studies of Direct Red 23 removal using zero-valent nanoparticles immobilized on multi walled carbon nanotubes from aqueous solution</strong>

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Title Statement <strong>Kinetic and thermodynamic studies of Direct Red 23 removal using zero-valent nanoparticles immobilized on multi walled carbon nanotubes from aqueous solution</strong>
 
Added Entry - Uncontrolled Name Mansouriieh, Nafiseh
Sohrabi, Mahmoud Reza
 
Uncontrolled Index Term Adsorption kinetics; Direct Red 23; Isotherm model; Multi-walled carbon nanotubes; Thermodynamic parameter; Zero-valent iron nanoparticles
 
Summary, etc. In the present study nanoscale zero valent iron (nZVI) has been immobilized on multi-walled carbon nanotubes (MWCNTs) and used to remove Direct Red 23 (DR 23) from aqueous solution. The effect of parameters such as, initial dye concentration, solution <em>p</em>H, adsorbent content, temperature and contact time on the adsorption process have been investigated. The studied adsorbent exhibits high efficiency for dye adsorption and the equilibrium state is achieved in 6 min. For equilibrium studies, three isotherm models, namely Langmuir, Freundlich and Temkin are used. It is found that Langmuir fits very well with experimental data. The kinetic studies suggest the process following pseudo second-order kinetics and involvement of the particle-diffusion mechanism. The value of different thermodynamic parameters, like Gibb’s free energy change, enthalpy change and entropy change of the adsorption process have also been evaluated. The adsorption of DR 23 has been found to be endothermic.
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2017-09-04 09:47:39
 
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http://op.niscair.res.in/index.php/IJCT/article/view/9867
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 24, ##issue.no## 4 (2017): Indian Journal of Chemical Technology
 
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Nonspecific Relationship Entry http://op.niscair.res.in/index.php/IJCT/article/download/9867/27596
http://op.niscair.res.in/index.php/IJCT/article/download/9867/27597
http://op.niscair.res.in/index.php/IJCT/article/download/9867/27598
http://op.niscair.res.in/index.php/IJCT/article/download/9867/27599
http://op.niscair.res.in/index.php/IJCT/article/download/9867/27614
http://op.niscair.res.in/index.php/IJCT/article/download/9867/27615
http://op.niscair.res.in/index.php/IJCT/article/download/9867/0
http://op.niscair.res.in/index.php/IJCT/article/download/9867/29177