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ปีีที่่� ๔๘ ฉบัับัที่่� ๒ พฤษภาคม-สิงหุ่าคม ๒๕๖๖

ศาสตราจารย์์ ดร.มะลิิ หุ่่�นสม แลิะคณะ 127

Abstract: Feasibility of gold recovery from printed circuits board

wastewater by black titanium dioxide
Professor Dr. Mali Hunsom

Associate Fellow of the Academy of Science,
The Royal Society of Thailand

Wastewater from printed circuit board manufacturing industries
contains various types of precious metal ions, such as gold. This work was

carried out to recover gold from printed circuit board wastewater by the
photocatalytic reaction using black TiO synthesized by chemical reduction
2
with NaBH as photocatalysts. The investigated parameters were the
4

quantity of employed NaBH (1.5-4.5 g) and added contents of activated
4
carbon (10-40 wt.%). It was found that a high quantity of NaBH induced
4
a high generation of oxygen vacancies in the black TiO structure and
2

also visible light response. Nevertheless, all the synthesized black TiO 2
illustrated a comparable photocatalytic activity for gold recovery.

Approximately 83-86% of gold was recovered within 1.5 h in the presence
of photocatalyst loading of 1.0 g/L and light intensity of 3.0 mW/cm .
2
The addition of activated carbon on the surface of black TiO importantly
2
improved the photocatalytic activity for gold recovery of the obtained

photocatalyst. The gold recovery of 94% can be achieved via the use
of black TiO in the presence of 40wt.% activated carbon (40AC/B1.5).
2

Keywords : photocatalysis, gold recovery, black titanium dioxide,
activated carbon