Document Detail

Adsorption of tannic acid, humic acid, and dyes from water using the composite of chitosan and activated clay.
MedLine Citation:
PMID:  15313633     Owner:  NLM     Status:  MEDLINE    
Chitosan is a well-known excellent adsorbent for a number of organics and metal ions, but its mechanical properties and specific gravity should be enhanced for practical operation. In this study, activated clay was added in chitosan slurry to prepare composite beads. The adsorption isotherms and kinetics of two organic acids (tannic acid, humic acid) and two dyes (methylene blue, reactive dye RR222) using composite beads, activated clay, and chitosan beads were compared. With composite beads as an adsorbent, all the isotherms were better fitted by the Freundlich equation. The adsorption capacities with composite beads were generally comparable to those with chitosan beads but much larger than those with activated clay. The pseudo-first-order and pseudo-second-order equations were then screened to describe the adsorption processes. It was shown that the adsorption of larger molecules such as tannic acid (MW, 1700 g mol(-1)), humic acid, and RR222 from water onto composite beads was better described by the pseudo-first-order kinetic model. The rate parameters of the intraparticle diffusion model for adsorption onto such adsorbents were also evaluated and compared to identify the adsorption mechanisms.
Min-Yun Chang; Ruey-Shin Juang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  278     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-08-17     Completed Date:  2006-05-22     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18-25     Citation Subset:  IM    
Department of Chemical Engineering, National United University, Miao-Li 360, Taiwan.
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MeSH Terms
Aluminum Silicates / chemistry*
Chitosan / chemistry*
Coloring Agents / chemistry,  isolation & purification
Hot Temperature
Humic Substances
Methylene Blue / chemistry
Sulfuric Acids
Tannins / chemistry,  isolation & purification
Water Pollutants, Chemical / isolation & purification*
Water Purification / methods*
Reg. No./Substance:
0/Aluminum Silicates; 0/Coloring Agents; 0/Humic Substances; 0/Sulfuric Acids; 0/Tannins; 0/Water Pollutants, Chemical; 1302-87-0/clay; 61-73-4/Methylene Blue; 7664-93-9/sulfuric acid; 9012-76-4/Chitosan

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