อนุภาคนาโนไทเทเนียมไดออกไซด์บนตัวกลางคาร์บอนพรุนที่ใช้ซ้ำได้สำหรับการบำบัดน้ำเสียที่มีสีย้อมเอโซ

Abstract

The treatment of azo-dye wastewater using titanium dioxide (TiO2) nanoparticles on porous carbon media was studied in this research. The porous carbon media was prepared using resorcinol and formaldehyde with the sol – gel process. TiO2 nanoparticles were synthesized by the precipitation method of titanium isopropoxide (TTIP) and calcination at 700°C (CTi700), 800°C (CTi800), and 900°C (CTi900) for 2 h. The morphologies of TiO2 nanoparticles on porous carbon were investigated using a scanning electron microscope (SEM) and transmission electron microscope (TEM). It was found that the titanium dioxide particles were nano-sized and uniformly distributed on the spherical porous carbon surface. The crystal structures of titanium dioxide (TiO2) nanoparticles on porous carbon media were investigated using X – ray Diffractometer (XRD). The result indicated that the CTi900 sample is mainly rutile crystal structures. Whereas CTi700 and CTi800, nano TiO2 exhibited mixed crystal structures between the minor anatase and primary rutile phases. Surface area and porosity analyzer (BET) results showed that CTi900 has the highest specific surface area and pore volume. The as-prepared TiO2 nanoparticles on porous carbon media have studied an application for wastewater treatment by using both photocatalytic and absorption properties of the materials. The experiment revealed that CTi900 could rapidly absorb the reactive black 5 dye. At 24 h, the percentage removal of CTi700, CTi800, and CTi900 were 2.3%, 7.3%, and 100%. After that, the photocatalytic process has experimented, and it was found that CTi900 had the highest photodegradation efficiency at 240 min. The percentage degradation of CTi900 was 34%. Reusable CTi900 particles were experimented with for degrading the reactive black 5 dye by UVC irradiation, it was found that CTi900 can be reused, and within 180 min, the dye degradation efficiency was 25 – 35 %.