AWWA ACE63010

Arsenic contamination in groundwater is of major concern to many water treatmentfacilities in the world. It is generally known that As(III) is more toxic than As(V) andorganic forms of arsenic. Various treatment technologies have been applied to removearsenic from drinking water such as coagulation-precipitation, reverse osmosis, ionexchange, and adsorption-filtration. Adsorption processes are often considered to bethe most effective forms of treatment for As(V), but they can be limited in their ability toremove As(III). To enhance removal efficiency of adsorption process for As(III), thisstudy has focused on developing highly ordered mesoporous adsorbents (HOMAs).One approach for fabricating reactive sites for As(III) in HOMAs is to incorporate nanoscaledtitania (TiO₂) into a mesoporous silicate molecular sieve such as SBA-15.Another approach is to fabricate O-Ti-O sites by producing mesoporous titania (MT).Kinetic tests at different initial pH (4, 7, 9.5) were conducted with As(III) to evaluaterates of adsorption and ultimate sorption capacity of two HOMAs. Greater extents ofadsorption were observed at higher pH for mesoporous titania, but silicate molecularsieve with incorporated titania showed the most removal of As(III) at the intermediatepH (pH 7). Includes 10 references, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

6

File Size:

1 file , 510 KB