Effective adsorption of Cr (VI) ions onto titanium dioxide immobilized high strength polyacrylamide hydrogels
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 9
Abstract
The “2-in-1” type polyacrylamide (PAAm) composite hydrogel adsorbers were prepared by in-situ polymerization reaction of acrylamide (AAm) monomer in presence of nano-sized TiO2 particles together with a chemical crosslinker. The TiO2 anatase nano-particles were synthesized by an acid-catalyzed sol-gel method from an alkoxide precusor. The morphological characterization of the hydrogels was done with SEM analyses. Their Cr(VI) ion adsorption capacities and wet strength properties were investigated via UV-Vis spectrophotometer and uniaxial compression tests, respectively. All the composite hydrogels showed higher swelling and adsorption performances than pure PAAm hydrogel. The neat hydrogel was found to adsorp 2.26 mg Cr(VI) per g hydrogel. On the other hand, the composite hydrogel having 0.1 wt% TiO2 was found to have the highest Cr(VI) adsorption which is 8.13 mg Cr(VI) per g hydrogel and about 260 % higher than that of neat PAAm hydrogel. This result is quite remarkable since the pure TiO2 synthesized adsorbed only 1.78 mg Cr(VI) per g nano-particle. The compression modulus, strength and toughness of the hydrogel in its wet form were found to be increased by about 80 %, 200 % and 120 %, respectively even at 0.1 wt% loading of the TiO2, compared to neat hydrogel
Authors and Affiliations
Emre Tekay, Demet Aydınoğlu, Ayşe N. Ökte, Sinan Şen
Keywords
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