"Removal of arsenic from water by zero-valent iron," written with George P. Korfiatis, Dean of Stevens' Charles V. Schaefer, Jr. School of Engineering and McLean Chair Professor is number 14 in the Journal of Hazardous Materials' top 25 articles of 2005. Following is an abstract of the paper:
"Batch and column experiments were conducted to investigate the effect of dissolved oxygen (DO) and pH on arsenic removal with zero-valent iron [Fe(0)]. Arsenic removal was dramatically affected by the DO content and the pH of the solution. Under oxic conditions, arsenate [As(V)] removal by Fe(0) filings was faster than arsenite [As(III)]. Greater than 99.8% of the As(V) was removed whereas 82.6% of the As(III) was removed at pH 6 after 9 h of mixing. When the solution was purged with nitrogen gas to remove DO, less than 10% of the As(III) and As(V) was removed. High DO content and low solution pH also increased the rate of iron corrosion. The removal of arsenic by Fe(0) was attributed to adsorption by iron hydroxides generated from the oxic corrosion of Fe(0). The column results indicated that a filtration system consisting of an iron column and a sand filter could be used for treatment of arsenic in drinking water."
A link to the full paper is at http://top25.sciencedirect.com/?journal_id=03043894.
The second paper, "Removal of arsenic from groundwater by granular titanium dioxide adsorbent," by Drs. Meng and Bang, along with Manish Patel and Lee Lippincott of the New Jersey Department of Environmental Protection, is number 10 in Chemosphere's top 25 articles of 2005. The abstract is below:
"A novel granular titanium dioxide (TiO2) was evaluated for the removal of arsenic from groundwater. Laboratory experiments were carried out to investigate the adsorption capacity of the adsorbent and the effect of anions on arsenic removal. Batch experimental results showed that more arsenate [As(V)] was adsorbed on TiO2 than arsenite [As(III)] in US groundwater at pH 7.0. The adsorption capacities for As(V) and As(III) were 41.4 and 32.4 mg g−1 TiO2, respectively. However, the adsorbent had a similar adsorption capacity for As(V) and As(III) (approximately 40 mg g−1) when simulated Bangladesh groundwater was used. Silica (20 mg l−1) and phosphate (5.8 mg l−1) had no obvious effect on the removal of As(V) and As(III) by TiO2 at neutral pH. Point-of-entry (POE) filters containing 3 l of the granular adsorbent were tested for the removal of arsenic from groundwater in central New Jersey, USA.
Groundwater was continuously passed through the filters at an empty bed contact time (EBCT) of 3 min. Approximately 45 000 bed volumes of groundwater containing an average of 39 ìg l−1 of As(V) was treated by the POE filter before the effluent arsenic concentration increased to 10 ìg l−1. The total treated water volumes per weight of adsorbent were about 60 000 l per 1 kg of adsorbent. The field filtration results demonstrated that the granular TiO2 adsorbent was very effective for the removal of arsenic in groundwater."
A link to the full text of this paper is at http://top25.sciencedirect.com/index.php?subject_area_id=13&journal_id=00456535
About Stevens Institute of Technology
Established in 1870, Stevens offers baccalaureate, masters and doctoral degrees in engineering, science, computer science, management and technology management, as well as a baccalaureate in the humanities and liberal arts, and in business and technology. Located directly across the Hudson River from Manhattan, the university has enrollments of approximately 1,780 undergraduates and 2,700 graduate students, and a current enrollment of 2,250 online-learning students worldwide. Additional information may be obtained from its web page at www.Stevens.edu. For the latest news about Stevens, please visit www.StevensNewsService.com.
Journal of Hazardous Materials