Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Degradation

Synthesis and Characterization of Chitosan- Polyvinyl alcohol Blend Modified by Genipin and Nanohydroxyapatite for Bone Tissue Engineering

Ishraq A. Kadhim; Zuhair J. Abdul Ameer; Assel B. Alzubaidi

Engineering and Technology Journal, 2019, Volume 37, Issue 11A, Pages 470-474
DOI: 10.30684/etj.37.11A.4

Use nanohydroxyapatite into the polymeric matrix as bioactive material for bone tissue engineering has enormous therapeutic potential because beneficial properties biocompatibility, biodegradability, and consider a major inorganic constituent of the bone matrix. The blended films of Chitosan and Polyvinyl alcohol with Genipin as cross-link agent were studied with and without addition Nanohydroxyapatite. Samples were prepared by solvent casting. The resulting films blended composite were characterized by Fourier transfer infrared (FTIR) spectroscopy, degradation behavior, swelling degree and tensile strength. Degree of swelling, and weight loss of the films blended composite was decreased with an increase of genipin and nanohydroxyapatie concentrations while tensile strength was increased with an increase of genipin and nanohydroxyapaite concentrations. The results showed that the chitosan composite could be used as effective biomaterials for bone regeneration engineering with different degradation rates.

Kinetics, Thermodynamic and Mechanism of Ultrasonic Degradation of Benzene in Aqueous Solution

Ismail K.Al-Khateeb; Adawiya J.Haider; Ahmed M. Mohammed

Engineering and Technology Journal, 2014, Volume 32, Issue 1, Pages 34-45

Ultrasonic technology, as an innovative technology,was used for degradation of benzene in an aqueous solution under ultrasound frequency of 20 kHz at different temperatures with initial concentration of 100 and 200 mg/L. Kinetic and thermodynamic of benzene degradation in aqueous solution were investigated.
While the mechanism of benzene sonolysis was discussed. The degradation rate of benzene increased with increasing electric power, sonication time and by decreasing liquid volume, temperature and initial concentration of benzene. The beneficial effect of which power electrical or ultrasound on removal rates is believed to be due to increased cavitational activity occurring at higher levels of
power. As power increases, the number of collapsing (effective) cavities also increases, which is leading to enhanced degradation rates. Thermodynamic parameters indicated that benzene degradation was spontaneous and exothermic in nature. The obtained data was fitted through the pseudo-first order model.