PENGARUH TiO2 DAN pH PADA FOTOREDUKSI ION Cu(II) DALAM LARUTAN YANG MENGANDUNG PARACETAMOL

Abstrak

Research on photoreduction of Hg(II) solution containing p-chlorophenol has been done. In photocatalitic approach, this study tried to overcome environmental problem due to Hg-polluted water that is still a seriuous problem now. Photocatalist material, such as TiO₂ have been developed to support the effort in solving such a problem. One of negative impact of industrial development is disposal of waste water generated from industrial activities. Industrial waste water may contain inorganic and organic chemicals. Anorganic waste such as Cu(II) in the aquatic environment has a threshold of 1 mg/L that present together with organic waste such as paracetamol. This study is purposed to determine the effect of TiO₂ mass and pH, and optimum conditions of TiO₂ catalyzed Cu(II) photoreduction effectiveness. Photocatalysis combines ultraviolet irradiation and semiconductor particles as photocatalysts in chemical proccess. Cu(II) photoreduction process was conducted in a closed reactor equipped with a magnetic stirre and UV lamp black light blue (BLB). After process solution was then analyzed by Atomic Absorption Spectrophotometer (AAS) to determine the remaining Cu(II) concentration  and visible spectrophotometer to determine the remaining paracetamol. Results show that Cu(II ion was reduced increasingly withy  mass of TiO₂. Within TiO­₂ range of  20 to 25 mg Cu(II) reduction increase moderately, TiO₂ mass of 30 to 50 mg was reduction was decreased.  Variation of solution pH, within  pH 3 to 5 shows the reduction  occure effectively, while it would decrease at pH 5 to 11. Reaction conditions that produce the the most effective process are pH 5, Cu(II) concentration of 10 mg/L 25 mL, with the addition of  25 mL  paracetamol 300 mg/L, TiO­₂ of 25 mg, with  irradiation time of 30 minutes. In these conditions Cu(II) ion was reduce effectively by 98.70% and paracetamol degraded by 14.61%.