Abstract
•Mixture of activated carbon and nano-tuabes support with good adsorption and conduction.•NiAl/layered double hydroxide catalyst-sorbent.•CeO2 is used as a promoter in redox reactions.•Ce-doped NiAl/layered double hydroxide/activated carbon catalyst-sorbents.•Removal of aqueous sulfur dioxide and hydrogen sulfide using adsorption and electrochemical method.
Ce-doped NiAl/layered double hydroxide was coated at activated carbon by urea hydrolysis method (CeO2-NiAl-LDHs/AC) in one pot, which was characterized by X-ray diffraction, infrared spectra, field emission scanning electron microscope and electrochemical techniques. CeO2-NiAl-LDHs/AC shows good uptake for aqueous sulfur dioxide (483.09mg/g) and hydrogen sulfide (181.15mg/g), respectively at 25°C. Meanwhile, the electrochemical removals of aqueous sulfur dioxide and hydrogen sulfide were respectively investigated at the mix of CeO2-NiAl-LDHs/AC and carbon nano-tubes modified homed paraffin-impregnated electrode. Both sulfur dioxide and hydrogen sulfide could be effectively oxidized to sulfuric acid at 1.0V in alkaline aqueous solution.