Adsorption-desorption of strontium from waters using aerobic granules

作者：Wang Li; Wan Chun Li; Lee Duu Jong^*; Tay Joo Hwa; Chen X F; Liu Xiang; Zhang Yi

来源：Journal of the Taiwan Institute of Chemical Engineers, 2013, 44(3): 454-457.

DOI：10.1016/j.jtice.2012.12.005

• Adsorption
• Desorption
• Kinetics
• Feasibility

Adsorption of Sr(II) from waters is regarded a unit operation to remediate nuclear contaminations in aquatic systems. Aerobic granules were applied as a biosorbent for removing Sr(II) from waters. At pH 6.2 and 35 C the adsorption can reach equilibrium within 2 h while the maximum adsorption capacity was estimated as 28.8 mg/g dried biomass. Kinetic model fitting suggested that the pseudo-second-order model best correlated the kinetic data, suggesting that chemical adsorption was the rate-limiting step. Repeated adsorption and then desorption with water, K(I), Na(I) and Ca(II) desorbents suggested that neither water alone or Ca(II) could effectively desorb Sr(II) from the aerobic granule surface. Conversely, Na(I) and K(I) could effectively complex with the functional groups on polysaccharides in the extracellular polymeric substance so could effectively desorb the bound Sr(II) out of the granule surface.

• 出版日期2013-5
• 单位复旦大学