Dual-Frequency Ultrasonic Desorption of Pb²⁺ from Coconut Shell Activated Carbon

Abstract:

Desorption experiments of coconut shell activated carbon (CSAC) saturated with Pb²⁺ had been conducted in presence of dual-frequency and single-frequency (30 kHz,500 kHz,1200 kHz) ultrasound. The desorption efficiency was better at dual-frequency ultrasound than at single-frequency ultrasound. The best of desorption efficiency of Pb²⁺ was 65.5% at 500×500 kHz. The desorption efficiency of Pb²⁺ increased by increasing temperature, but when the temperature was more than 50°C, the desorption efficiency decreased initially. The stability of CSAC was not affected with cavitation effect produced by ultrasound of frequency of 500×500 kHz. The carbon loss was less. The rate of loss was only 0.6%. In conclusion, ultrasound was used as alternative method to regenerate activated carbon adsorbing with heavy metal ion.

• Periodical: Advanced Materials Research (Volume 777)
• Pages: 38-42
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.777.38
• Online since: September 2013
• Authors: Jian Zhou, San Fan Wang
• Keywords: Coconut Shell Activated Carbon, Dual-Frequency, Heavy Metal Ion, Ultrasonic Regeneration

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