Titanium dioxide effect on the decolourisation of organic dyes Remazol Black B using electrocoagulation in situ-Fe2O3

Abstract

ABSTRACT In this research, combination of TiO2 pillared clay with electrocoagulation in situ-Fe2O3 provides excellent performance to remove dyes water waste Remazol Black B(RBB). The best TiO2:clay ratio is 1:6, with highest degradation performance 89.8% in 30 minutes photodegradation process under UV light 254 nm. The excellent performance of pillared clay causes mesoporous pore that can be achieved by pillarisation of the clay layer using titanium dioxide sol which was made by diluting TiCl4 in ethanol solution. Besides, the excellent electrocoagulation performance was conducted by dual compartment system using 10ppm of RBB in the alkaline system containing 1 g NaCl as an electrolyte at potential apply+6 V with 98% degradation efficiency in 3 hours running compared to the 78% in single compartment system towards the formation of in situ-Fe2O3 that is directly driven by formation of intermediate species Fe(OH)3. This optimum decolourisation efficiency was gained at 0.1 A, pH 7.2 and 2 cm of inter-electrode distance. The power consumption was very low with the excellent and fast degradation performance towards organic dyes Remazol Black B, where this tandem cell can produce 100 mL clean water using 0.0052 kWh energy with cheaper cost operation.