Adsorption of Zn2+ by Sargassum horneri and Desorption at Simulated Marine Environment

• Published in: Applied Mechanics and Materials Vol. 209-211; pp. 1093 - 1099
• Main Authors: Zheng, Chong Ying, Fang, Yuan Hao, Ai, Ning, Wang, Tie Gan, Zeng, Gan Ning, Bao, Hai Jun, Zhou, Hong Yan, Zhou, Yan
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.10.2012
• Subjects: Sargassum horneri; Desorption; Adsorption; Zinc
• ISBN: 3037854855; 9783037854853
• ISSN: 1660-9336; 1662-7482; 1662-7482
• DOI: 10.4028/www.scientific.net/AMM.209-211.1093

The adsorption of Zn2+ from simulated seawater onto biomaterial derived from the macroalgae Sargassum horneri was investigated via batch experiments. The highest adsorption rate was 96.9%, which found in the lower Zn2+ concentration solution where pH was 8.0 and temperature was 15°C, and the maximum adsorption capacity of dead Sargassum horneri particle to Zn2+ could arrive to more than 0.20 mg.g-1. Sargassum horneri pretreated with CaCl2 can increase the adsorption rate. Infrared analysis results showed that carboxylic acid groups have an important contribution to Zn2+ adsorption. The adsorption equilibrium of Zn2+ could be represented by pseudo-second-order model and the capacity of dead alga for Zn2+ was approximately constant. Conclusions could be drawn that Sargassum horneri is a kind of efficient biosorbent for the treatment of waste waters containing heavy metals. It was because Zn2+ can easily be desorbed by competition between the hydrogen ions and metal ions on the cell surface binding sites, that hydrochloric acid was proved to have economic feasibility.