REMOVAL OF REACTIVE BLACK 5 DYE BY UV BASED PHOTOCATALYSIS PROCESS USING IMMOBILIZED ZnO NANOPARTICLES ON CERAMIC PLATE

• Main Author: Aditya, Wisnu
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/37392
• Institution: Institut Teknologi Bandung

Textile wastewater has been known to contain high organic contaminants and colors that can interfere with aesthetically. The processing of textile wastewater is very necessary to do before finally being released into the environment. In general, the effluent characteristics of the processing of conventional textile WWTPs still leave high color and high content of organic contaminants. Therefore, increasing the quality of effluent can be carried out through a tertiary process using advanced oxidation process (AOP) with a combination of ZnO and UV semiconductor metals, namely the photocatalytic process. The use of ZnO in powder form can also cause post-separation related problems at the end of the treatment. In this study, removal of azo dyes in the form of Reactive Black 5 (RB5) was carried out in a low concentration range (3-10 mg/L) using UV-based photocatalysis and ZnO nanoparticles immobilized on ceramic plates. The photocatalytic rotating disc (PRD) type reactor will be used in this study both batch and continuous. The purpose of this study was to determine the decolorization and organic (COD mg/L) removal efficiency at each optimum condition (pH, catalyst dose, processing time, and initial concentration of RB5) along with the kinetic rate constant based on the pseudo-order 1 kinetic model. The dip coating by direct dispersion technique was used in the process of photocatalyst immobilization onto the ceramic surface and subsequently characterized using SEM-EDS. Based on the SEM and EDS results, the size of the nanoparticles (NPs) dispersed onto the ceramic surface were in the range of 100-500 nm and 5.5 mg/cm2 of the ceramic surface (approximately 82% of ZnO NPs on the ceramic surface). The photocatalytic processes that have been done in batch and continuous scheme (initial COD concentration of 25 mg/L or 3 mg/L RB5) at each optimum condition were successfully removed COD with the value of 0.0054 and 0.000712 mg COD/L/cm2 contact area/g ZnO/W/cm2 UV- C irradiance distance/minute respectively by decolorization efficiency of 100% (batch) and 62% (continuous). Decolorization kinetic rate constants by batch and continuous of RB5 at each optimum condition were obtained with the value of 0.093 and 0.0214 minute-1, while COD removal kinetic rate constants were 0.0073 (batch) and 0.0036 minute-1 (continuous) respectively.