Fotokatalis yang menggunakan titanium dioksida merupakan satu kaedah rawatan air sisa yang terjamin dalam pembersihan air. Dalam kajian ini, Compound Parabolic Collecting Reactor (CPCR) digunakan untuk merawat sisa farmaseutikal (tetrasiklin). Parameter operasi ialah tempoh pendedahan terhadap cahaya matahari, pH, kepekatan titanium dioksida dan kepekatan tetrasiklin. Air sisa sintetik disediakan dengan mencairkan tetrasiklin and titanium dioksida ke dalam 15L air suling. Sampel-sampel yang dikumpulkan selepas proses rawatan dihantarkan ke makmal untuk menjalankan ujian HPLC. Ujian HPLC dijalankan untuk mengenal pasti kepekatan tetrasiklin. Kajian kawalan menunjukkan peratusan tertinggi untuk menyingkirkan tetracycline ialah tindak balas fotokatalis (81%) diikuti tindak balas fotolisis (69%). Sebaliknya, tindak balas untuk proses hidrolisis dan penjerapan tidak mengubahkan kepekatan tetrasiklin pada akhirnya. Keadaan optimum dalam kajian ini ialah di bawah pH 9 dengan 3.0 g/L tetracycline dan 0.025 g/L titanium dioksida dalam 30 minit penyinaran cahaya matahari. Keputusan menunjukkan kecekapan penyingkiran dalam keadaan optimum ialah 92%. Kesimpulannya, kajian ini membuktikan bahawa tindak balas fotolisis berupaya untuk menghapuskan tetrasiklin dari air sisa farmaseutikal sintetik.
_______________________________________________________________________________________________________
Photocatalysis using the TiO2 (catalyst) suspensions have become attractive as a promising wastewater treatment method for water purification. In this study, Compound Parabolic Collecting Reactor (CPCR) was used to treat the pharmaceutical waste (tetracycline).The operating parameters were sunlight exposure period, pH level, concentration of titanium dioxide and concentration of the tetracycline. The synthetic wastewater was prepared by the dilution of tetracycline and titanium dioxide into 15L distilled water. The collected samples was analysed by HPLC in laboratory after the treatment process was completed. The control study showed that the highest percentage removal of tetracycline is through the photocatalytic reaction (81%) and followed by photolytic reaction (69%). On the other hand, for the hydrolysis and adsorption, the reaction did not make any changes to the concentration of tetracycline in the end of the process. The optimum condition for the study was under pH 9 with 3.0 g/L of tetracyline and 0.025 g/L of TiO2 in 30 minutes of irradiation period. The result showed the removal efficiency in optimum condition was 92%. In conclusion, the results proved that photocatalytic reaction is able to eliminate the tetracycline from synthetic wastewater.
Removal of pharmaceutical pollutant (tetracycline) from synthetic wastewater using photocatalysis / Ho Xhi Yng