Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays

Yongxin Lin; Xihua Cao; Xiuxian Song; Nan Wang; Zhiming Yu

doi:10.1007/s00343-013-2226-8

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Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays

Updated：2023-05-16

- Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays
- Journal of Oceanology and Limnology Vol. 31, Issue 4, Pages: 867-875(2013)
- Affiliations：
  
  1. Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-013-2226-8
  CLC：
- Online First：10 July 2013，
  
  Published：2013
- Accepted：
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Lin, Y., Cao, X., Song, X. et al. Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays., Chin. J. Ocean. Limnol. 31, 867–875 (2013). https://doi.org/10.1007/s00343-013-2226-8
DOI：

Lin, Y., Cao, X., Song, X. et al. Mechanisms and factors affecting the adsorption of sodium alginate onto modified clays., Chin. J. Ocean. Limnol. 31, 867–875 (2013). https://doi.org/10.1007/s00343-013-2226-8 DOI：

摘要

Abstract

Algal organic materials (AOMs) are one critical factor affecting the efficiency of modified clays used for the mitigation of harmful algal blooms (HABs). This study was conducted to develop a deeper understanding of the mechanisms and factors affecting the adsorption of AOMs onto modified clays. Sodium alginate (polysaccharide) and kaolinite modified with polyaluminium chloride (PACl) were used as AOMs and modified clay model substances

respectively

and the effects of modifier dosage

contact time

solution pH and ionic strength were investigated through batch adsorption experiments. Kinetics revealed that the alginate adsorption rate was described well by a pseudo-second order model. PACl effectively enhanced the adsorption capacity of kaolinite and increased the adsorption rate

and the optimum additive amount of PACl was 5%. The experimental data fitted both the Freundlich and Langmuir adsorption equations well. The adsorption thermodynamics for alginate onto modified clays suggests that alginate adsorption is a spontaneous process. The adsorption of alginate onto modified clays was highly dependent on pH

with a decrease in adsorption observed with increased pH to 9.48

but the opposite was true above pH 9.48. Finally

adsorption increased with increasing ionic strength.

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Keywords

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