TiO₂ BEADS FOR PHOTOCATALYTIC DEGRADATION OF HUMIC ACID IN PEAT WATER

Abstract

Degradation of humic acid in aqueous solution containing TiO2 coated on ceramics beads under irradiation of 254 nm UV light has been conducted in batch reactor. The aim of this experiment was to study photocatalytic degradation of humic acid in peat water. The irradiation of the humic acid in aqueous solution was conducted in various conditions i.e solely uv, in the presence of TiO2-slurry and TiO2 beads. The color intensity, humic acid residue, conductivity and COD (chemical oxygen demand) of the solution were analyzed before and after irradiation. The compounds produced during photodegradation were identified using HPLC. The results showed that after photocatalytic degradation, the color intensity and the COD value of the solution decreased, while the conductivity of water increased indicating mineralization of the peat water occurred. In addition, oxalic acid as the product of degradation was observed.

Enhanced Photocatalytic Activity of Zn-Al Layered Double Hydroxides for Methyl Violet and Peat Water Photooxidation

“…Moreover, the dark color of the peat water is the major problem in the whole process. Compared to the use of other photocatalysts such as TiO 2 bead, the DE from this research is comparable [ 45 , 46 ]. Previous studies revealed that about 40% COD removal was achieved by using 250 mg/L TiO 2 beads under UV illumination for 120 min.…”

Synthesis and characterization of TiO2 and palm oil fiber ash hybrid photocatalysts for seawater pretreatment

“…At the same time, the surface area of pure oil palm fibre ash was decreased from 18.1 m 2 /g to 12.9 m 2 /g. The increase of the surface area of TiO2 in the photocatalytic process is related to the production of species reactive in the solution (Andayani & Bagyo, 2011). W. E. Kan claims that the TiO2 has an inflation character off in the water, which leads to an increase in the surface area of the catalyst after the reaction (Kan et al, 2016).…”

A Review: Development of Photocatalyst Materials and Its Performance for Humic Acid Removal in Peatwater

“…Humic acid is an aromatic compound with carbonyl groups and phenolic formed by the degradation of plant and microbial materials. The humic acid content causes the pH of peat water to be low and the color change to be brown (Andayani & Bagyo, 2011). The molecular structure of humic acid is shown in Figure 1.…”