Preparation and application of nano TiO2 filmcoated recycled low-iron crushed glass in a novel packed-bed photocatalytic reactor for efficient removal of biodegradable contaminants
The high demand for water treatment and environmental restoration via advanced oxidation process (AOP) has estimated the increased production of TiO 2 -based materials. Low cost, high transmittance, durability, and thermal stability, make the recycling low-iron crushed glass an excellent candidate for nano TiO 2 film coating via sol-gel process. Besides support selection, the reactor design plays a vital role in the final product's applicability and efficiency. In this work, small pieces (3–6 mm) of recycled low iron crushed glass were deep coated with multiple layers of nano TiO 2 film for photocatalytic degradation of selected contaminants in a new design packed-bed reactor. A multi-chamber packed-bed photocatalytic reactor was set up for efficient BOD degradation under UV light exposure. SEM, XRD, and BET analysis characterized coating characteristics, morphology, phase, and surface area. For film adherence and coating durability, SEM characteristics and durability of TiO 2 photocatalytic activity tests were performed after the second reutilization. Results revealed that the new reactor can achieve 45.81 up to 79.50% BOD 5 reduction after 24 to 48 h of circulation with constant operation, respectively. low iron crushed glass appeared to be a perfect support for TiO 2 film coating with a BET of 0.0742 m 2 /g after 9 cycles of coating. XRD results showed 95–97% anatase phase crystals with an average particle size of 12.97 nm with different rounds of annealing at 550 °C in muffle. Results underpinned that the technique seems promising to be applied on a large scale for pretreated industrial or pharmaceutical wastewater.
危险品化学品经营许可证（带存储）