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Removal of Methylene Blue From Industrial Wastewater in Palestine Using Polysiloxane Surface Modified with Bipyrazolic Tripodal Receptor

Thu, 2016-01-28 12:25 — Ismail Warad
Journal Title, Volume, Page: 
Moroccan Journal of Chemistry, 4(1) 140-156
Year of Publication: 
2016
Link: 
http://revues.imist.ma/?journal=morjchem&page=article&op=view&path[]=4015
Authors: 
S.Jodeh
Correspondence Author :E-mail:[email protected]; Tel: +970599590498; Fax: +97092345982. Received 05 Nov 2015, Revised 25 Dec 2015, Accepted 05 Jan 2016
Current Affiliation: 
Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
[email protected]
J.Amarah
Current Affiliation: 
Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
S.Radi
Current Affiliation: 
2LCAE-URAC 18, Faculty of Science, University of Mohammed Premier, Po Box 717 60000 Oujda, Morocco
O.Hamed
Current Affiliation: 
Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
I.Warad
Current Affiliation: 
Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine
[email protected]
R.Salghi
Current Affiliation: 
Laboratory of Materials and Environment, University Ibn Zohr, B.P. 8106, 80000, Agadir, Maroc
A.Chetouni
Current Affiliation: 
LCAE-URAC 18, Faculty of Science, University of Mohammed Premier, Po Box 717 60000 Oujda, Morocco
S.Samhan
Current Affiliation: 
Director of Research and Development Palestinian Water Authority, Ramallah, Palestine
R.Alkowni
Current Affiliation: 
Department of Biology, An-Najah National University, P. O. Box 7, Nablus, Palestine
Preferred Abstract (Original): 
Different pollutants from industries leach every day to soil and ground waters without treatment. The product N,N-bis (3,5-Dimethylpyrazol-1-yl methyl)-3-aminopropyl Polysiloxane (Si-C3H6NPz2) was successfully prepared. The FTIR results confirmed that the dimethylpyrazole units have been immobilized onto the surface of the modified silica gel. The adsorption experiments were conducted for a wide range of solution pH, adsorbent dosage, temperature, initial concentration and contact time. It was observed that the percentage removal of methylene blue dye decreased with an increase initial concentration and temperature while it increased with increase in solution pH, contact time and adsorbent dose. Over 82% removal efficiency of methylene blue dye was achieved after 180 min at solution pH around 10, 20°C temperature, 0.25 g weight of dose and initial concentration of 15 mg/L of 50mL MB dye solution.  Negative ∆G° values (-17.17 to -17.25 KJ/mol) indicate that the adsorption is favorable and spontaneous at these temperatures. The negative value of ∆H° (-16.66 KJ/mol) reflects an exothermic adsorption and indicates that the adsorption is favored at low temperature. The value of ∆H° was higher than those corresponding to physical adsorption. This would suggest that the adsorption process is chemical in nature. The small positive value of ∆S° (+1.78 J/mol.K) suggests that some structural changes occur on the adsorbent and the randomness at the solid/liquid interface in the adsorption system increases during the adsorption process. The results of the present study show that the prepared compound has a negative biological activity against Pseudomonas aeruginosa, Staphylococcus aurous, and Escherichia coli. 
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