Document Detail

Adsorption and co-precipitation behavior of arsenate, chromate, selenate and boric acid with synthetic allophane-like materials.
MedLine Citation:
PMID:  19493614     Owner:  NLM     Status:  MEDLINE    
Pollution caused by boric acid and toxic anions such as As(V), Cr(VI) and Se(VI) is hazardous to human health and environment. The sorption characteristics of these environmentally significant ionic species on allophane-like nanoparticles were investigated in order to determine whether allophane can reduce their mobility in the subsurface environment at circum-neutral pH condition. Solutions containing 100 or 150 mmol of AlCl(3)x6H(2)O were mixed to 100 mmol of Na(4)SiO(4) and the pH were adjusted to 6.4+/-0.3. The mineral suspensions were shaken for 1h and incubated at 80 degrees C for 5 days. Appropriate amounts of As, B, Cr and Se solutions were added separately during and after allophane precipitation. The results showed that As(V) and boric acid can be irreversibly fixed during co-precipitation in addition to surface adsorption. However, Cr(VI) and Se(VI) retention during and after allophane precipitation is mainly controlled by surface adsorption. The structurally fixed As(V) and boric acid were more resistant to release than those bound on the surface. The sorption characteristics of oxyanions and boric acid were also influenced by the final Si/Al molar ratio of allophane in which Al-rich allophane tend to have higher uptake capacity. The overall results of this study have demonstrated the role of allophane-like nanoparticles and the effect of its Si/Al ratio on As, B, Cr and Se transport processes in the subsurface environment.
Einstine Opiso; Tsutomu Sato; Tetsuro Yoneda
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Publication Detail:
Type:  Journal Article     Date:  2009-05-09
Journal Detail:
Title:  Journal of hazardous materials     Volume:  170     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-07-28     Completed Date:  2009-10-05     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  79-86     Citation Subset:  IM    
Laboratory of Environmental Geology, Division of Solid Waste, Resources and Geoenvironmental Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
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MeSH Terms
Aluminum Silicates / chemistry*
Boric Acids / isolation & purification*
Chemical Precipitation
Chromates / isolation & purification*
Environmental Pollutants / isolation & purification
Nanoparticles / chemistry
Selenium Compounds / isolation & purification*
Reg. No./Substance:
0/Aluminum Silicates; 0/Boric Acids; 0/Chromates; 0/Environmental Pollutants; 0/Selenium Compounds; 11113-50-1/boric acid; 7783-08-6/selenic acid

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