Simultaneously efficient adsorption and photocatalytic degradation of sodium dodecyl sulfate surfactant by one-pot synthesized TiO₂/layered double hydroxide materials

ABSTRACT

The large amount of surfactants discharge into wastewater are harmful for both terrestrial and aquatic life; in fact the removal of surfactants from wastewater becomes necessary. The present study is focused on to the removal of sodium dodecyl sulphate surfactant (SDS) by adsorption and photocatalytic degradation using Zn(2)Al-LDH and TiO₂/Zn(2)Al-LDH materials synthesized by co-precipitation. The experimental adsorption data obtained were evaluated using Langmuir Freundlich and Temkin isotherms models. The photocatalytic degradation activities of SDS at different concentration in the range of (10−100 mg/L) over Zn(2)Al-LDH and TiO₂/Zn(2)Al-LDH follows the pseudo first-order kinetics in accordance with the Langmuir Hinshelwood model. The results indicated that TiO₂(3.6)/Zn(2)Al-LDH show the highest photocatalytic activity compared to Zn(2)Al-LDH sample.

KEYWORDS:

• Degradation
• hydrotalcite
• photocatalytic
• wastewater
• surfactant