Hybrid nanocomposites based on graft copolymer of chitosan with poly(vinyl alcohol) and titanium oxide

2009 ◽  
Vol 4 (5-6) ◽  
pp. 331-339 ◽  
Author(s):  
A. N. Ozerin ◽  
N. S. Perov ◽  
A. N. Zelenetskii ◽  
T. A. Akopova ◽  
L. A. Ozerina ◽  
...  
2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Syazwan Liyana Sulaiman ◽  
Zawati Harun ◽  
Sufizar Ahmad ◽  
Hariati Taib

The application of photocatalytic beads in wastewater treatment application has gained attention of many researchers. In this study, the synthesised poly(vinyl alcohol)/chitosan/Titanium oxide (PVA/CS/TiO2) beads has been considered as a promising alternative to conventional means of wastewater treatment. The present study has successfully synthesised PVA/CS/TiO2 beads through simple dropwise method in which varied concentration of CS from 1.0 g to 2.5 g. Morphological analysis of the synthesised PVA/CS/TiO2 beads investigated by the FE-SEM technique revealed that porous beads were obtained regardless of the varied CS concentration content. Furthermore, solubility and swelling properties investigation of the beads were also performed within the prescribed time of 24h in three different medium which were acidic, distilled water and alkaline solution. Result of solubility test proved that PVA/CS/TiO2 beads were insoluble only in distilled water and alkaline solution. However, the beads were found to dissolve in acidic solution due to the CS content. Meanwhile, the swelling test revealed that increased concentration of CS leads to swelling of beads in distilled water and alkaline solution. Results revealed that beads with the highest CS composition which is 2.5 g recorded 82.6% and 118.4% of swelling in distilled water and alkaline solution, respectively. In the mean time, beads with the lowest CS composition which is 1.0 g only swell for 65.8% and 93.3% in distilled water and alkaline solution, respectively. As a conclusion, the synthesised beads in this study is feasible to be applied in natural to alkaline environment.


2013 ◽  
Vol 35 (6) ◽  
pp. 1117-1131 ◽  
Author(s):  
Steven Spoljaric ◽  
Arto Salminen ◽  
Nguyen Dang Luong ◽  
Panu Lahtinen ◽  
Jari Vartiainen ◽  
...  

2009 ◽  
Vol 113 (6) ◽  
pp. 3954-3962 ◽  
Author(s):  
MinJie Guo ◽  
JianJun Xia ◽  
Zhi Fan ◽  
Zhuo Zhao ◽  
HuaiFeng Mi

2006 ◽  
Vol 309-311 ◽  
pp. 1153-1156 ◽  
Author(s):  
Caihong You ◽  
Toshiki Miyazaki ◽  
Eiichi Ishida ◽  
Masahiro Ashizuka ◽  
Chikara Ohtsuki

Organic polymers with ability of apatite formation in body environment are expected as novel bone substitutes having not only bone-bonding ability, i.e. bioactivity, but also mechanical performance analogous to natural bone. Several metal oxides have been found to be effective for the apatite deposition in body environment. In addition, release of calcium ions from the materials significantly enhances it. In this study, we attempted to synthesize bioactive organic-inorganic hybrids from poly(vinyl alcohol) (PVA) by incorporation of titanium oxide or zirconium oxide as well as calcium salt. Ability of apatite formation on the hybrids was examined in vitro using simulated body fluid (SBF, Kokubo solution). Apatite deposition was observed to occur on the surfaces of PVA/titanium oxide hybrids in SBF, when their compositions were appropriately controlled.


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